• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention concerns a roving frame (1) for producing a roving (11) from a sliver (8) with a plurality of roving production positions (6) each comprising a drafting arrangement (10), a spindle (12) for receiving a bobbin (13) and a flyer (14) for winding up the roving (11) onto the bobbin (13). The roving frame (1) comprises a measurement set-up (19) with at least one measurement unit (4) arranged on each roving production position (6) between the delivery rollers (16, 17) of the drafting arrangement (10) and the flyer (14), wherein the plurality of measurement units (4) in each case contain at least one sensor (31), and the measurement set-up (19) is configured for continuously measuring at least one quality and/or production parameter of the roving (11) at each roving production position (6) by means of the measurement units (4).
    公开号:EP3708700A1
    申请号:EP19175743.4
    申请日:2019-05-21
    公开日:2020-09-16
    发明作者:Kavitha Chandran
    申请人:Kavitha Chandran；
    IPC主号:D01H13-00
    专利说明:
    [0001] The present subject matter described herein relates to the field of producing a roving from a sliver. The invention relates to a roving frame according to the preamble of claim 1. The invention further concerns a measurement unit for a roving frame, an individual roving production position monitoring system with a plurality of measurement units and a method for monitoring the roving production in a roving frame.
    [0002] In a roving frame, also called roving machine or fly frame, a roving is produced from a sliver. The sliver is produced upstream of the yarn production process in a drawframe. The roving is the starting product for producing a yarn e.g. in a ring spinning machine. Thus, the roving is significantly thicker than a yarn but also significantly thinner than a sliver.
    [0003] Ring spinning is a method of spinning fibres, such as cotton, flax, wool, synthetic or a mixture thereof, to make a textile yarn. Accordingly, the roving can be of one of the aforementioned materials.
    [0004] The main task of a roving frame is to further draft a sliver into a fibre strand of finer count, the so called roving. This intermediate production step is necessary as the ring spinning machine is not capable of processing a thick sliver to a yarn of fine count. Moreover, the handling of a sliver in a ring spinning machine is still unsolved. This, because there is not enough space in the ring spinning machine for storing the bulky sliver cans in which the sliver is provided due to the poor strength of the sliver.
    [0005] Furthermore, another task of the roving frame is to insert a protective twist into the roving in order to enhance the strength of the textile fibre strand and thus make it transportable without being damaged since the sliver as well as the roving of fine count produced from the sliver has scarcely a coherence without a protective twist.
    [0006] The protective twist is a slight twist which only serves for giving the roving enough (tensile) strength, that is to say stability for transportation. The protective twist is resolved again in the drafting arrangement of the ring spinning machine.
    [0007] A roving frame as known from the state of the art comprises a plurality of roving production positions in which in each case a roving is produced from a sliver.
    [0008] The sliver is provided from a sliver can and guided via a creel to and through a drafting arrangement in which the sliver is drafted to the thickness of a roving. The drafted sliver leaves the drafting arrangement through delivery rollers and is transported towards a rotating flyer. The roving is wound by the rotating flyer onto a bobbin arranged on a rotating spindle. The protective twist is brought into the roving between the delivery rollers of the drafting arrangement and the bobbin by means of the rotating flyer while winding the roving onto the bobbin. Normally, the roving is guided within a leg of the flyer towards the winding position on the bobbin surface.
    [0009] As mentioned above, the flyer rotates around the rotating spindle and hence around the bobbin. Thus, the flyer has the two functions of applying a protective twist to the roving and for winding the roving onto the bobbin. The flyer functionally corresponds to the ring traveller of the ring spinning machine.
    [0010] From the roving usually a high quality yarn is produced in a ring spinning machine. In order to ensure a high yarn quality it is known from the state of the art to measure quality parameters of the yarn by means of sensors arranged after the drafting arrangement of each spinning positions of a ring spinning machine.
    [0011] However, the quality parameters measured in a ring spinning machine are only useful for taking any steps downstream of the production process. Furthermore, the measured quality parameters do not allow sound conclusions regarding the quality of the roving. This, because the roving already has been processed and thus altered by the drafting arrangement of the ring spinning machine before any quality parameters are measured downstream of the drafting arrangement.
    [0012] From CN 205420658 U it is known to measure the evenness of roving in a roving frame by means of a travelling optical sensor moveable between the roving production positions for sporadically measuring the evenness of the roving on a single roving production position. The disclosed system may be sufficient for making random sample measuring during production. However, the system is not suitable for improving the quality of the yarn production process profoundly.
    [0013] It is therefore an object of present invention to further improve the yarn production process in a spinning mill.
    [0014] In particular, it is an object of the present invention to improve the control of the processing of textile fibre material upstream of the ring spinning machine in a spinning mill.
    [0015] It is another objective of present invention to decrease production losses and increase effectiveness and efficiency of the yarn production process in a spinning mill.
    [0016] It is another objective of present invention to improve production quality and/or quantity in a spinning mill.
    [0017] At least one of the objective is solved by the features of the independent claims. Specific embodiments of the invention and further developments of the invention are subject of the dependent claims, the description and the drawings.
    [0018] As mentioned above the invention concerns a roving frame for producing a roving from a sliver with a plurality of roving production positions each comprising a drafting arrangement, a spindle for receiving a bobbin and a flyer for winding up the roving onto the bobbin.
    [0019] According to the invention, the roving frame comprises a measurement set-up with at least one measurement unit arranged on each roving production position between the delivery rollers of the drafting arrangement and the flyer. Said plurality of measurement units in each case contain at least one sensor.
    [0020] The measurement set-up can be configured for continuously measuring at least one quality parameter of the roving at each roving production position by means of the plurality of measurement units.
    [0021] The measurement set-up can be configured for continuously measuring at least one production parameter of the roving at each roving production position by means of the plurality of measurement units.
    [0022] In particular, the measurement set-up can be configured for continuously measuring at least one quality parameter and at least one production parameter of the roving at each roving production position by means of the plurality of measurement units.
    [0023] The at least one quality and/or production parameter are measured on-line. In particular, the at least one quality and/or production parameter are measured in real-time.
    [0024] Of course, the continuous measuring of at least one quality and/or production parameter of the roving is based on a continuous production of the roving and thus on a continuous transport of the roving within the roving frame. Thus, the roving is continuously transported through the measurement unit, that is to say through the measuring field of the sensor.
    [0025] In particular, the measurement set-up is configured to continuously measure one or more of the following quality parameters of the roving online: thickness; thickness deviations; evenness/unevenness; thick places; thin places; variation of thickness on short or long term; presence of foreign matter.
    [0026] Foreign matter in particular is trash, that is to say debris. Foreign matter can be organic elements such as seed coats, or inorganic matter such as plastic, e.g. polypropylene. The plastic material can be of different colours and be transparent or opaque.
    [0027] Furthermore, the at least one sensor can measure mass per unit length or linear mass density.
    [0028] Furthermore, the at least one sensor can measure the hairiness of the roving.
    [0029] Quality parameters relating to the thickness of the roving in particular can be derived from sensor signals, that is to say sensor data, given by a capacitive or an optical sensor.
    [0030] Hairiness, foreign matters are usually determined by an optical sensor.
    [0031] A production parameter serves for characterising the running status of continuously transported roving. In general, production parameters are related to a quantity of a production process and/or to a status of a roving production position.
    [0032] Examples for the running status can correspond to the following: "Running" or "stopped". Parameters associated with "Running" can comprise one or more of Rotational Speed Yarn Length Slips (slow speed spindles)
    [0033] Parameters associated with "Stopped" can comprise one or more of Simple Break Idles (Long duration breaks) Startup breaks (breaks during machine start) Mending time (duration of stop)
    [0034] For example at least one sensor can measure the presence of a roving and thus a roving break.
    [0035] As mentioned above, the at least one sensor can be an optical sensor. The optical sensor can be designed for measuring reflectivity of light e.g. in the visible and/or infrared and/or ultraviolet (UV) spectrum.
    [0036] The optical sensor can be designed for measuring occlusion, i.e. absorption of light (shadow information) e.g. in the visible and/or infrared and/or ultraviolet (UV) spectrum.
    [0037] The term "designed to/for" can also be read as "configured to/for". Accordingly, the optical sensor in particular can be an infrared sensor or an UV-sensor.
    [0038] The optical sensor can also be a camera. The camera in particular contains an image sensor, in particular an active-pixel sensor (APS), such as a CMOS sensor using CMOS technology.
    [0039] The optical sensor can comprise an optical lens, in particular for focusing or dispersing a light beam by means of refraction.
    [0040] The optical sensor can comprise at least one sensor element arranged to measure the at least one quality and/or parameter. The at least one sensor element can also be designed for measuring several quality parameters, or several production parameters or at least one quality and at least one production parameter
    [0041] The optical sensor can also comprise a plurality of sensor elements/multiple sensor elements for measuring several quality parameters or several production parameters or at least one quality and production parameter.
    [0042] It can be the case that the sensor is configured to generate a sensor signal from readings of a single one of the at least one sensor elements, or from readings of two or more of the at least one sensor elements.
    [0043] As mentioned above, the at least one sensor can also be a capacitive sensor, also called capacitance sensor. In this case the roving is guided between two electrodes of the capacitance sensor and thus changes the dielectric properties therebetween. The changing dielectric properties can be used to derive at least one quality and/or production parameter of the roving.
    [0044] However, the at least one sensor can also be a mechanical sensor. The mechanical sensor can be a displacement sensor. Such a displacement sensor can comprise a biased lever which lies against the roving, in particular presses against the roving. A change of roving thickness causes a deflection, that is to say a displacement, of the biased lever. From the extent of displacement at least one quality and/or production parameter can be derived.
    [0045] The contact surface of the lever for establishing a contact with the roving can be arranged underneath the roving. The contact surface of the lever can be arranged above the roving. The contact surface of the lever can be arranged laterally of the roving.
    [0046] It can be the case that one sensor measures one quality parameter.
    [0047] It can be the case that one sensor measures one production parameter.
    [0048] It can be the case that two, three or more than three, that is to say several quality parameters are measured with one single sensor.
    [0049] It can be the case that two, three or more than three, that is to say several production parameters are measured with one single sensor.
    [0050] It can be the case that at least one quality parameter and at least one production parameter are measured with one single sensor.
    [0051] It can be the case that the measurement units in each case contains only one single sensor for measuring in each case at least one of a quality parameter and production parameter.
    [0052] It can be the case that the measurement units in each case contain two, three or more than three, that is to say several sensors for measuring in each case at least one of a quality parameter and production parameter.
    [0053] The measurement units in each case can be configured for measuring at least one quality parameter and at least one production parameter as well.
    [0054] The measurement units in each case can be configured for measuring at least one quality parameter. This can be only one quality parameter. This can be two, three, or more than three, that is to say several or a plurality of quality parameters.
    [0055] The measurement units in each case can be configured for measuring at least one production parameter. This can be only one production parameter. This can be two, three, or more than three, that is to say several or a plurality of production parameters.
    [0056] The measurement units in each case can be configured for measuring at least one quality parameter and at least one production parameter as well.
    [0057] It can be provided that in each case at least one first sensor of the measurement units measures at least one quality parameter and at least one second sensor of the measurement units measures at least one production parameter.
    [0058] However, it can be the case that the measurement unit is a quality measurement unit which only measures one or more quality parameters.
    [0059] However, it can be the case that the measurement unit is a production measurement unit which only measures one or more production parameters.
    [0060] The measurement set-up can comprise a quality measurement unit for measuring at least one quality parameter and a production measurement unit for measuring at least one production parameter as well. This two units are arranged on each roving production position.
    [0061] The quality and production measurement units can be designed as separate modules. The two modules, within the roving production position, can be arranged on different places between the drafting arrangement and the flyer.
    [0062] The quality and production measurement units can also be arranged on a common carrier structure.
    [0063] The measurement set-up can further comprise at least one roving frame computer arrangement for collecting and/or evaluating the measuring results of the plurality of measurement units provided on the roving production positions of the roving frame.
    [0064] The measuring results which are transmitted to the roving frame computer arrangement can be a quality and/or production parameter or a deviation of the quality and/or production parameter from a reference value, furthermore can be sensor raw data or interim values for evaluating a quality and/or production parameter or a mentioned deviation. In particular, the roving frame computer arrangement is arranged on the roving frame.
    [0065] A individual roving production position monitoring system, as described in more details below, which comprises the measurement set-up can comprise a superordinate computer arrangement for collecting and/or evaluating the measuring results provided by at least one roving frame computer arrangement or provided directly from the plurality of measurement units on the roving production positions of at least one roving frame. The measuring results which are transmitted to the at least one superordinate computer arrangement can be a quality and/or production parameter, sensor data or interim values for evaluating a quality and/or production parameter.
    [0066] The superordinate computer arrangement in particular is arranged outside the roving frame, but can also be arranged on a roving frame.
    [0067] In particular, the superordinate computer arrangement is configured to collect and/or evaluate measuring results from the roving frame computer arrangements or directly from the measurement units of several roving frames.
    [0068] The superordinate computer arrangement can correspond to a central computer arrangement. However, the superordinate computer arrangement can also be configured to transmit the measuring results to a central computer arrangement.
    [0069] Accordingly, the individual roving production position monitoring system can further comprise a central computer arrangement which in particular is located outside the roving frame, e.g. in a computer or quality and production control room.
    [0070] The central computer arrangement in particular comprises a display unit for displaying measuring information as described further below.
    [0071] The central computer arrangement can e.g. be a desktop computer with a display unit, such as a screen.
    [0072] The central computer arrangement can also be a handheld device such as a smartphone or PDA or (tablet) computer. The handheld device can be a third-party device.
    [0073] According to an embodiment each measurement unit comprises a sensor data processing unit.
    [0074] A sensor data processing unit can be designed for determining the quality and/or production parameter from the sensor raw data, that is to say from sensor signals.
    [0075] A sensor data processing unit can be designed for determining deviations of the quality and/or production parameters from a reference value from the sensor raw data, that is to say from sensor signals.
    [0076] A sensor data processing unit can be designed for determining intermediate/interim values from the sensor raw data, that is to say from sensor signals.
    [0077] The above mentioned quality and/or production parameter, deviations of the quality and/or production parameters from a reference value and intermediate/interim values, hereinafter generally are called "processed sensor data".
    [0078] The at least one sensor can be integrated into the sensor data processing unit. I.e., the sensor data processing unit and the at least one sensor can form a sensor module.
    [0079] Thus, the sensor data processing unit evaluates the sensor raw data and converts the sensor raw data into processed sensor data.
    [0080] Several sensors of a measurement unitcan cooperate with a common sensor data processing unit.
    [0081] In this embodiment processed sensor data are evaluated within the measurement unit(s). The processed sensor data in particular are transmitted to a roving frame computer arrangement or directly to a superordinate computer arrangement, as mentioned above, for further processing.
    [0082] It is also possible that the sensor raw data are transmitted from the measurement units to a roving frame computer arrangement or a superordinate computer arrangement for evaluating processed sensor data. In this case the roving frame computer arrangement or the superordinate computer arrangement comprises a common sensor data processing unit.
    [0083] It can be the case that the measurement units in each case comprise a visual indicator to indicate at least one quality and/or production parameter information. The visual indicator is designed to indicate at least one quality and/or production parameter information. The quality and/or production parameter information can be a quality and/or production parameter or a deviation of a quality and/or production parameter from a reference value.
    [0084] In particular, the visual indicator can be configured to indicate a deviation of such a quality and/or production parameter from a reference value, hereinafter simplified called "deviation". Thus, the visual indicator can also be configured to give an alert to the operation personnel in case of a deviation.
    [0085] It is also possible that on each roving frame, e.g. on the head or foot end, a central/common visual indicator is arranged for indicating quality and/or production parameter information of the roving production positions of said roving frame.
    [0086] The visual indicator in particular comprises at least one of: a lamp which can be operated to be lit in one or more colours that are indicative of one or more values of the parameter or deviation; or a lamp which can be operated to be permanently lit or flashing, this being indicative of one or more values of the parameter or deviation; or a lamp which can be operated to flash at different frequencies that are indicative of one or more values of the parameter or deviation; and a display unit that is configured to display one or more values of the parameter or deviation.
    [0087] It is also possible that an acoustic alarm is given, in case of a deviation.
    [0088] The individual roving production position monitoring system or more specific the measurement set-up can comprise at least one display unit for displaying quality and/or production parameter information. The at least one display unit can e.g. be a display, a screen or a monitor.
    [0089] In an embodiment the measurement set-up comprises a roving frame display unit which is arranged on the roving frame. In case of several roving frames, on each roving frame a roving frame display unit can be arranged. The roving frame display unit can be integrated into a roving frame computer arrangement as described further above. The roving frame display unit in particular serves for displaying quality and/or production parameter information of the roving production positions of said roving frame. The roving frame display unit can be arranged on the head or foot end of the roving frame.
    [0090] In an embodiment the individual roving production position monitoring system comprises a central/common display unit which in particular is arranged outside the roving frame. The central/common display unit can be part of a superordinate, in particular central computer arrangement as described further above.
    [0091] In an embodiment a display unit as a part of the measurement set-up can be arranged on each roving production position for displaying quality and/or production parameter information of a roving production position. The display unit can be integrated into measurement unit as already described above.
    [0092] The display unit in particular is configured to display at least one of: one or more values of quality and/or production parameters or deviation from a plurality of measurement units as described above, in particular an alert; and one or more combined values computed from the values of quality and/or production parameters from a plurality of measurement units, e.g. by means of the roving frame computer arrangement or a superordinate computer arrangement. Such combined values characterising an overall quality representing the plurality of measurement units and being, for example, computed by summing these values of quality and/or production parameters and/or by computing statistical measures from these values.
    [0093] Such information can be provided by a monitoring unit as described further below.
    [0094] As mentioned above, the at least one display unit, in particular a central/common display unit or a roving frame display unit can be provided with the data from a monitoring unit.
    [0095] The monitoring unit can be part of a superordinate, in particular central computer arrangement as described above.
    [0096] The monitoring unit can be part of a roving frame computer arrangement as described above. I.e., in this case every roving frame computer arrangement comprises a monitoring unit.
    [0097] It is also possible that the roving frame display unit or a common display unit is provided with the data (directly) from the measurement units.
    [0098] A communication between a roving frame computer arrangement or a superordinate computer arrangement and the measurement units can be wire-based or wireless.
    [0099] A communication between a roving frame display unit or a common display unit and the roving frame computer arrangement or a superordinate computer arrangement can be wire-based or wireless.
    [0100] A communication between a roving frame display unit or a common display unit and the measurement units can be wire-based or wireless.
    [0101] As mentioned above, the at least one display unit can be part of the measurement set-up or broader defined of an individual roving production position monitoring system itself, in particular of a superordinate computer arrangement thereof.
    [0102] The at least one display unit, in particular a common display unit can also be implemented by a handheld device such as a smartphone or PDA or (tablet) computer. The handheld device can be a third-party device.
    [0103] In this connection the present invention also concerns an individual roving production position monitoring system, that is to say an individual roving production position online monitoring system, with a measurement set-up comprising a plurality of measurement units each having at least one sensor for continuously measuring at least one quality and/or production parameter of a roving at each roving production position of a roving frame.
    [0104] In particular, the measurement set-up of the individual roving production position monitoring system comprises all the features, that is to say components, of the individual roving production position monitoring system which are arranged within the roving frame.
    [0105] It is possible that all features, that is to say components, of the individual roving production position monitoring system are arranged on the roving frame.
    [0106] However, preferably certain features, that is to say components, such as e.g. a monitoring unit or a superordinate computer arrangement, of the individual roving production position monitoring system can be arranged outside the roving frame.
    [0107] The individual roving production position monitoring system for on-line roving quality monitoring in a roving frame allows for at least one of the following benefits: On-line quality monitoring allows for adjusting machine parameters, thereby improving the quality of roving during production; Monitoring directly on the roving frame and for each roving production position makes it easy for technical personnel to monitor and control the quality of roving produced when compared to the existing laboratory (offline) testing methods; Production of bad quality roving in specific roving production positions can be identified and defects can be rectified immediately, which is not possible in off-line laboratory quality testing methods; Maintenance personnel in spinning mill can identify defective roving positions there itself and can take corrective actions immediately. This can save a huge time for carrying the bobbins from department to laboratory, testing and results analysis as in case of laboratory testing methods; The maintenance frequency of the roving frames and the replacement and/or maintenance of components used in the roving manufacturing can be scientifically founded by analysing the quality information of produced in the roving frame; Comparison of quality of roving from each roving production position in relation to the adjacent and other positions can be performed on-line, during production; In the case that there are deviations from the norm in the preceding spinning preparation processes like carding, combing, draw frames etc., corresponding deviations and faults will get noticed in a plurality of the roving production positions. They can be analysed further by an operator to understand the cause and source of the deviation; Based on long term information from the on-line quality measurement at the stage of roving, it is possible to analyse the effect of raw material quality on the quality of the roving produced in the roving frame.
    [0108] In particular, the functions mentioned above are carried out by a monitoring unit as described below.
    [0109] The individual roving production position monitoring system in particular comprises a superordinate computer arrangement - as mentioned above - for collecting and/or evaluating the measuring results, in particular the quality and/or production parameters of the plurality of measurement units provided on the roving production positions. The measured quality and/or production parameters or their deviation from a reference value can be the basis for further use and analyses.
    [0110] The individual roving production position monitoring system in particular comprises a monitoring unit that is configured to continuously monitor at least one quality and/or production parameter of the continuously transported roving in each roving production position of the roving frame online; based on an on-line analysis of the monitored at least one quality and/or production parameter, identify a malfunction of the at least roving production position or identify a substandard quality of a sliver material fed to the roving production position.
    [0111] As mentioned above, the monitoring of the at least one quality and/or production parameter is online.
    [0112] The monitoring of the at least one quality and/or production parameter in particular is in real-time.
    [0113] The monitoring unit can be a dedicated hardware unit, e.g. of a superordinate computer arrangement or a roving frame computer arrangement, or it can be implemented as a software function in a superordinate computer arrangement or a roving frame computer arrangement.
    [0114] However, the monitoring unit can also be a separate unit, which e.g. communicates by wire or wireless with a superordinate computer arrangement.
    [0115] However the monitoring unit can also communicate by wire or wireless (directly) with the measurement units.
    [0116] The monitoring unit can be arranged within the roving frame. However, the monitoring unit in particular is arranged outside the roving frame, e.g. in a computer room or quality control room or on a mobile device as mentioned above.
    [0117] The monitoring unit can be configured to display the quality measurements in graphical formats like diagram, Spectrogram, histogram, VL (variance length) curves, thick and thin distribution, foreign scatter chart, etc., e.g. on the at least one display unit.
    [0118] When a malfunction is identified, a signal - typically optical or acoustical - to an operator can be generated, and/or an error logfile can be updated with information about the malfunction. The signal can also be indicated at the measurement units as mentioned above.
    [0119] It can be the case that the monitoring unit is configured to detect thin places, and to identify a malfunction of feeding slivers when too many thin places occur.
    [0120] It can be the case that the monitoring unit is configured to monitor a first and a second of two adjacent roving production positions, with a first quality and/or production parameter measured at the first roving production position and a second quality and/or production parameter measured at the second roving production position, and to identify a malfunction of drafting rollers for the two roving production positions when the first and the second quality and/or production parameter deviate in the same way.
    [0121] It can be the case that the monitoring unit is configured to detect when the thickness of a roving deviates from a reference thickness for a time that is longer than a time limit, and to identify a malfunction of the drafting system if this is detected.
    [0122] The monitoring unit can be arranged to operate as in the following embodiments:When each of the roving production positions is monitored through the individual roving production position monitoring system, then the reason for deviation in quality and/or production parameters can be determined immediately as the roving production takes place.
    [0123] For example, machinery part defects in each roving production position will be identified easily by observing a quality and/or production parameter deviation. One example is identifying the reason for high thin places (that is, unacceptably thin places) in roving: The reason for high thin places may be due to improper and irregular feeding of sliver material. More particular, the reason can be an obstruction of the free movement of the sliver between the sliver can and the drafting arrangement, which causes an uncontrolled drawing of the sliver upstream of the drafting arrangement. When high thin places are detected by the individual roving production position monitoring system at a particular roving production position, the obstructing can be identified.
    [0124] A further quality parameter is hairiness, determined by a measurement of the fibres protruding over the roving. One cause of deviations of hairiness are deviations in preparatory processes which cause more short fibres in the sliver that enters the roving frame, which in turn creates more hairiness of the roving produced. In such a case, hairiness monitoring in the roving production machine can alert an operator, indicating deviations of hairiness exceeding a given limit.
    [0125] It can happen that there is a problem in the drafting rollers of a roving frame, which causes the quality of both rovings delivered from the drafting zone to be affected. This is because the drafting arrangement configuration is such that two top rollers are connected to each other. The drafting arrangement serves two roving production positions. Hence, if one or more quality and/or production parameters of two adjacent delivery rovings both deviate from the norm, in particular in the same way, then the reason can be identified as being a malfunction of the drafting arrangement. Typical deviations caused by the drafting arrangement are thick places, thin places and unevenness.
    [0126] In some cases, if the mass per unit length of the sliver is wrong, then the delivery roving count will also become wrong. Yarns produced from such rovings with deviated counts will cause more cuts in further processes such as an auto winder and/or deteriorates the appearance of the fabric produced from the yarn. Such yarns will have a different quality characteristic compared to the normal yarns. Rovings with deviated counts can be identified and corrected on-line and already in the roving frame.
    [0127] For example, if the count of the roving at a particular roving production position varies, then quality characteristics like unevenness and hairiness varies and will have significantly different values compared to the other roving production positions which are producing a correct roving count. Such quality characteristic deviations can be considered to alert the operator so that he can check the count of the roving delivered and also the properties of the feed material, and initiate corrective action.
    [0128] The individual roving production position monitoring system in particular is configured for autonomous operation. Autonomous in particular means that the system is not linked to the machine control or another control arrangement of the roving frame for receiving commands. Thus, the system is independent from the manufacturer of roving frame and thus can be applied on roving frames of different manufacturer. Furthermore, the system is suitable for retrofitting or upgrading of existing roving frames.
    [0129] However, it is also possible that the individual roving production position monitoring system or its measurement set-up is interlinked with the machine control of the roving frame, e.g. for receiving control information from the machine control or for transmitting control commands to the machine control.
    [0130] The individual roving production position monitoring system or its measurement set-up in particular can be interlinked with the machine control of the roving frame in such a way that they are able to transmit commands, such as a machine stop, to the machine control. Hence, when one or more machine or one or more spindles produce poor quality against set limits, the roving frame can be stopped by the individual roving production position monitoring system or its measurement set-up.
    [0131] Once the machine is stopped, the reason for the machine stop can be intimated to the operation personnel through various light indications, computer, display units and/or communication devices like hand held devices or acoustically.
    [0132] In a further development of the invention the measurement units in each case comprises a guidance device for guiding the roving through the measurement unit, in particular through a measurement area, that is to say measuring field of the measurement unit. The guidance device forms a support for the roving.
    [0133] The support in particular forms a contact surface for supporting the roving. The support supports the roving in particular from below. Accordingly, the contact surface is arranged underneath the passing roving.
    [0134] However, the contact surface can also be arranged above the passing roving for supporting the roving from above.
    [0135] However, the contact surface can also be arranged laterally from the passing roving for supporting the roving from the side.
    [0136] It can be the case that the support with its contact surface exerts a pressure onto the passing roving.
    [0137] It can be the case that the support with its contact surface serves for tensioning the roving passing through the measurement area of the sensor.
    [0138] The contact surface of the support can be made of a ceramic material. The ceramic material can be a coating or a solid body.
    [0139] The support serves for correctly positioning and stabilising the passing roving within the measurement area of the sensor. Further, the support serves for avoiding a swinging that is to say oscillation of the roving while passing through the measurement area.
    [0140] In particular, the guidance device contains a first and a second support structure each having a contact surface for supporting the roving from below. The first and second support structure are arranged in succession and in distance to each other as viewed in the transport direction of the roving.
    [0141] In particular, the measurement area as viewed in roving transport direction is located in a roving path section arranged between the first and second support structure.
    [0142] In particular, below the measurement area a passage is formed which is open in the downwards direction, so that fibre fragments or dust can fall downwards through the passage out of the measurement unit, that is to say out of the measurement area.
    [0143] This prevents the accumulation of fibres and debris in the region of the sensor, in particular in the measurement area.
    [0144] In particular, the passage is located underneath the roving path.
    [0145] In particular, the passage is located underneath the measurement area.
    [0146] In particular, the passage is formed between the first and second of the above mentioned support structures.
    [0147] The description above regarding the guidance device provided in measurement units in particular applies to optical sensors.
    [0148] The optical sensor of the measurement unit in particular comprises a signal source and a signal detector. The signal source in particular is a light source. The signal detector in particular is a photoelectric receiver.
    [0149] In particular, the signal source and a signal detector of the sensor are arranged laterally from the passing roving, that is to say from the roving path.
    [0150] In an embodiment of present invention the signal source and the signal detector are arranged on opposite sides relative to the passing roving, that is to say the roving path. In this case the measurement area is arranged between the signal source and the signal detector through which the roving is guided, that is to say through which the roving path leads.
    [0151] In another embodiment the signal source and the signal detector are arranged on a common side relative to the roving guided past the at least one sensor, that is to say roving path. In this case the measurement area in particular is established laterally of the sensor. In this case the signal source and the signal detector can be arranged in a common assembly.
    [0152] In particular, the measurement unit is designed as a module. I.e. the measurement unit is designed as a construction unit. The measurement unit in particular has a common carrier structure for mounting on a fixation provided at the roving frame.
    [0153] The components of the measurement unit in particular are arranged in a common housing.
    [0154] The measurement unit in particular is mounted on a fixation provided on the roving frame. The fixation can be a mounting rod which extents across the roving production positions between the delivery rollers of the drafting arrangement and the flyer. In particular the fixation is a non-moving part of the roving frame.
    [0155] The invention also concerns a method for upgrading a roving frame comprising the steps of: providing a plurality of measurement units configured to continuously measure at least one quality and/or production parameter of a roving being continuously transported within the roving frame; arranging on each roving production position of the roving frame a measurement unit.
    [0156] The invention also concerns a method for monitoring the roving production in a roving frame, characterised by the following steps: continuously measuring at least one quality and/or production parameter of the roving on each roving production position by means of an individual roving production position monitoring system as described above; comparing the continuously measured quality and/or production parameter with target values; initiating an action, as e.g. stopping the roving production or triggering an alarm, in case the continuously measured quality and/or production parameters do not lie within the target values.
    [0157] Other aspects, advantages, further developments and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses an exemplary embodiment of the invention. The drawings schematically show: Figure 1: a perspective view of a roving frame; Figure 2: a lateral view of a roving production position of a roving frame; Figure 3: a perspective view of a measurement unit according to a first embodiment; Figure 4: a perspective view of measurement units according to figure 3 at roving production positions of a roving frame; Figure 5: a perspective view of a measurement unit according to a further embodiment; Figure 6: a lateral view of a measurement unit according to a further embodiment; Figure 7: a lateral view of a measurement unit according to a further embodiment; Figure 8: a perspective view of a measurement unit according to a further embodiment; Figure 9: a diagram of an embodiment of an individual roving production position monitoring system according to the invention; Figure 10: a diagram of an embodiment of a measurement set-up according to the invention.
    [0158] Basically, in the figures the same features have the same reference numerals.
    [0159] The roving frame 1 according to figure 1 comprises a plurality of roving production positions 6. Such a roving production position 6 is shown in figure 2 in more detail.
    [0160] In each roving production position 6 a roving 11 is produced from a sliver 8 which is fed from a sliver can 7. The sliver 8 is guided via deflection rollers of a creel 9 towards a drafting arrangement 10 and transported through the drafting arrangement 10 in a transport direction D.
    [0161] The sliver 8 is drafted in the drafting arrangement 10 into a thinner roving 11 which leaves the drafting arrangement 10 through the delivery roller 16, 17. The roving 11 is further transported in transport direction D towards a rotating spindle 12 and wound up by a flyer 14 onto a bobbin 13 arranged on the rotating spindle 12. The rotating flyer 14 applies a protective twist to the roving 11.
    [0162] In case of a roving break the roving is sucked in at a suction pipe 18 arranged at the exit of the delivery roller pair 16, 17 (see figure 2).
    [0163] Usually, two roving production positions 6 share a common pivoted weighting arm carrying top rollers which are pressed against bottom rollers of the drafting arrangement 10.
    [0164] The roving frame 1 further comprises a measurement set-up 19 which is part of a individual roving production position online monitoring system 3. The measurement set-up 19 comprises a measurement unit 4 on each roving production position 6 for measuring at least one quality parameter and/or production parameter. The measurement units 4 are arranged on a mounting rod 15 which extends across the roving production positions 6 between the delivery rollers 16, 17 of the drafting arrangements 10 and the flyers 14. The measurement units 4 are connected to a central computer arrangement 2 via communication lines 5 for collecting and/or evaluating measuring results of the measurement units 4.
    [0165] Figures 3 to 8 show different embodiments of measurement units 4, 41, 51, 61, 71. The measurement units 4, 41 according to figure 3 and 4 in each case contain an optical sensor 31, 49.
    [0166] According to the embodiment of a measurement unit 4 as shown in figure 3 the optical sensor 31 comprises a signal source 32 and a signal detector 33 which are arranged opposite to each other. Between the signal source 32 and the signal detector 33 a measurement area 30 is established through which the roving 11 is transported. Accordingly, the roving 11 is guided between the signal source 32 and the signal detector 33 through the measurement unit 4, that is to say through the measurement area 30.
    [0167] The measurement unit 4 further comprises a first and second support structure 35, 36, each forming a contact surface 38 for supporting the roving 11 from below. The first and second support structure 35, 36 are distanced to each other in transport direction D of the roving 11.
    [0168] Between the first and second support structure 35, 36 a passage 37 is formed which is open downwards. The measurement area 30 is established in the region of the roving path arranged between the first and second support structure 35, 36. Thus the passage 37 is located underneath the measurement area 30.
    [0169] For measuring a quality and/or production parameter an optical measuring beam is send from the sensor source 32 towards the sensor detector 33 across the transport direction D of the roving 11 and in particular across the alignment of the roving 11, that is to say across the roving path. Accordingly, the optical signal path 34 runs across the transport path of the roving 11.
    [0170] Based on optical reflectivity or optical absorption a quality and/or production parameter can be measured.
    [0171] In present case the first and second support structure 35, 36 in each case form a trough-shaped contact surface against which the roving 11 lie.
    [0172] Fibre fragments, dust and debris in general fall through the passage 37 downwards out of the measurement unit 4 and in particular out of the measurement area 30. This ensures a reliable measurement of the quality and/or production parameter without distortion caused by accumulated fibre fragments, debris, etc. in the measurement area 30 or at the sensor 31.
    [0173] The measurement unit 4 is designed as a module, that is to say as an assembly unit, which is fastened on a holding member of the roving frame 1, in present case a mounting rod 15, via connection interfaces.
    [0174] The measurement unit 4 further comprises a visual indicator 80. In present case the visual indicator 80 is a signal lamp for optical indication of a deviation of a measured quality and/or production parameter from a reference value.
    [0175] Figure 4 shows several measurement units 4 as shown in figure 3 arranged in roving production positions of a roving frame 1 downstream of the delivery rollers of the drafting arrangement 10 and upstream of the flyer. The measurement units 4 are arranged next to each other and mounted on a mounting member 15 of the roving frame 1. After passing the measurement units 4 the roving is guided through an intake member 20 into a leg of a flyer 14 and led towards to the winding position on the surface of the bobbin 13 (not shown).
    [0176] The measurement unit 41 as shown in figure 5 contains an optical sensor 49 with a signal source 42 and a signal detector 43 which are arranged on the same side as viewed in transport direction of the roving 11. I.e. the sensor 49 is arranged laterally of the passing roving 11, that is to say the roving path, as viewed in transport direction D.
    [0177] Beside the sensor 49 a measurement area 40 is established through which the roving 11 is transported, that is to say the roving path leads through the measurement area.
    [0178] The measurement unit 41 further comprises a first and second support structure 45, 46, each forming a contact surface 48 for supporting the roving 11 from below. The first and second support structure 45, 46 are distanced to each other in transport direction D of the roving 11.
    [0179] Between the first and second support structure 45, 46 a passage 47 is formed which is open downwards. The measurement area 40 is established in the region of a roving path section arranged between the first and second support structure 45, 46. Thus the passage 47 is located underneath the measurement area 40.
    [0180] For measuring a quality and/or production parameter an optical measuring beam is send from the sensor source 42 across the transportation direction D of the roving 11 towards the roving 11. The optical measuring beam is at least partly reflected at the surface of the roving 11 towards the sensor detector 43 arranged at the same side as the sensor source 42.
    [0181] Accordingly, the optical signal path 44 runs from the sensor source 42 towards the roving 11 and back towards the sensor detector 43.
    [0182] Based on the optical reflectivity or optical absorption a quality and/or production parameter can be measured.
    [0183] In present case the first and second support structure 45, 46 in each case form a trough-shaped contact surface against which the roving 11 lies.
    [0184] Fibre fragments, dust and debris in general fall through the passage 47 downwards out of the measurement unit 41 and in particular out of the measurement area 40. This ensures a reliable measurement of the quality and/or production parameter without distortion caused by accumulated fibre fragments, debris, etc.
    [0185] The measurement unit 41 is designed as a module, that is to say as an assembly unit, which is fastened on a holding member of the roving frame 1, in present case a mounting rod 15, via connection interfaces.
    [0186] The measurement unit 41 further comprises a visual indicator 80. In present case the visual indicator 80 is a signal lamp for optical indication of a deviation of a measured quality and/or production parameter from a reference value.
    [0187] Figure 6 shows a measurement unit 51 with a capacitance sensor 59 having a first and a second electrode 52, 53 which are distanced to each other for measuring at least one quality and/or production parameter. The roving 11 is guided through the space between the two electrodes 52, 53 of the capacitance sensor 51. The roving 11 changes the dielectric property therebetween. The changing dielectric properties are used to derive at least one quality and/or production parameter of the roving 11.
    [0188] Figure 7 and 8 show a measurement unit 61, 71 with a mechanical sensor 69, 79 each comprising a deflectable lever 62, 72 for measuring at least one quality and/or production parameter.
    [0189] In the embodiment according to figure 7 the roving 11 is guided below the lever 62 an across the lever 62 along the transport direction D and exerts a pressure onto the lever 63 from below.
    [0190] In the embodiment according to figure 8 the roving 11 is guided above the lever 72 along the transport direction D and exerts a pressure onto the lever 72 from above.
    [0191] The levers 62, 72 are biased, e.g. spring-loaded, so that the lever 62, 72 always maintain a press on contact to the passing roving 11.
    [0192] In the individual roving production position monitoring system according to figure 9 the measurement units 4 in each case comprise a sensor data processing unit 81 which processes the sensor raw data of the at least one sensor of the measurement unit 4. On each roving frame 1 a roving frame computer arrangement 82 is provided which collects all the processed sensor data from the measurement units 4 of a single roving frame 1.
    [0193] A superordinate computer arrangement 84 which is located outside the roving frames 1 or on one of the several roving frames 1 collects the processed sensor data from all the roving frame computer arrangements 82.
    [0194] The superordinate computer arrangement 84 transmits the processed sensor data to a central computer arrangement 2 which is located outside the roving frames 1, e.g. in a computer or quality and production control room.
    [0195] The data transmission between the roving frame computer arrangements 82 and the superordinate computer arrangement 84 in particular is wireless.
    [0196] The data transmission between the superordinate computer arrangement 84 and the central computer arrangement 2 in particular is wireless.
    [0197] The central computer arrangement 2 is configured to further evaluate and display the processed sensor data or other information derived thereof on a display unit 83, e.g. in the form of graphical representations. For this, the central computer arrangement 2 comprises a monitoring unit (not shown) and a display unit 83, such as a screen.
    [0198] In the measurement set-up according to figure 10 the measurement units 4 in each case comprise a sensor data processing unit 81 which processes the sensor raw data of the at least one sensor of the measurement unit 4. At the roving frame 1 a roving frame computer arrangement 82 is provided which collects the processed sensor data from the measurement units 4.
    [0199] Furthermore a display unit 83 is provided at the roving frame 1, e.g. at its head end, for displaying the processed sensor data or other information derived thereof.
    权利要求:
    Claims (19)
    [0001] A roving frame (1) for producing a roving (11) from a sliver (8) with a plurality of roving production positions (6) each comprising a drafting arrangement (10), a spindle (12) for receiving a bobbin (13) and a flyer (14) for winding up the roving (11) onto the bobbin (13),characterised in that the roving frame (1) comprises a measurement set-up (19) with at least one measurement unit (4) arranged on each roving production position (6) between the delivery rollers (16, 17) of the drafting arrangement (10) and the flyer (14), wherein the plurality of measurement units (4) in each case contain at least one sensor (31), and the measurement set-up (19) is configured for continuously measuring at least one quality and/or production parameter of the roving (11) at each roving production position (6) by means of the measurement units (4).
    [0002] The roving frame (1) according to claim 1, characterised in that the measurement set-up (19) is configured to continuously measure one or more of the following quality parameters of the roving (11):
    - thickness;
    - thickness deviations;
    - evenness/unevenness;
    - thick places;
    - thin places;
    - variation of thickness on short or long term;
    - presence of foreign matter.
    [0003] The roving frame (1) according to claim 1 or 2, characterised in that the at least one sensor (31) is:
    - an optical sensor,
    - a capacitance sensor, or
    - a mechanical sensor.
    [0004] The roving frame (1) according to one of the claims 1 to 3, characterised in that each measurement unit (4) comprises a guidance device (39) for guiding the roving (11) through the measurement unit (4), in particular through a measurement area (30) of the measurement unit (4), wherein the guidance device (39) forms a support (35, 36) for the roving (11).
    [0005] The roving frame (1) according to claim 4, characterised in that the guidance device (39) comprises a first and a second support structure (35, 36) each forming a contact surface (38) for supporting the roving (11), wherein the first and second support structure (35, 36) are arranged in succession and in distance to each other as viewed in the transport direction (D) of the roving (11).
    [0006] The roving frame (1) according to claim 5, characterised in that the measurement area (30) is located in the region of the roving path section arranged between the first and second support structure (35, 36).
    [0007] The roving frame (1) according to one of claims 1 to 6, characterised in that below a measurement area (30) a passage (37) is formed which is open in the downwards direction, so that fibre fragments or dust can fall downwards out of the measurement unit (4), in particular out of the measurement area.
    [0008] The roving frame (1) according to claim 7, characterised in that the passage (37) is formed between a first and second support structure (35, 36).
    [0009] The roving frame (1) according to one of the claims 1 to 8, characterised in that the at least one sensor (31) of the measurement unit (4) comprises a signal source (32) and a signal detector (33) which are arranged laterally from the passing roving (11) or roving path.
    [0010] The roving frame (1) according to one of claims 1 to 9, characterised in that the at least one sensor (31) of the measurement unit (4) comprises a signal source (32) and a signal detector (33) which are arranged on opposite sides relative to the roving (11), wherein the measurement area (30) is arranged in a space between the signal source (32) and the signal detector (33) through which the roving (11) is guided.
    [0011] The roving frame (1) according to one of claims 1 to 9, characterised in that the at least one sensor (31) of the measurement unit (4) comprises a signal source (32) and a signal detector (33) which are arranged on a common side relative to the roving (11) guided past the at least one sensor (31).
    [0012] A measurement unit (4) for arranging on a roving production position (6) of a roving frame (1) between the delivery rollers (16, 17) of the drafting arrangement (10) and the flyer (14), wherein the measurement unit (4) contains at least one sensor (31) for continuously measuring at least one quality and/or production parameter of the roving (11) at the roving production position (6).
    [0013] The measurement unit (4) according to claim 12, characterised in that the measurement unit (4) is designed as a module which is mountable on a fixation provided on the roving frame (1).
    [0014] A measurement unit (4) according to claim 12 or 13, characterised in that the measurement unit (4) contains a visual indicator (80) for indicating at least one quality and/or production parameter information.
    [0015] An individual roving production position monitoring system (3) with a measurement set-up (19) comprising a plurality of measurement units (4) according to one of the claims 12 to 14, each measurement unit (4) having at least one sensor (31) for continuously measuring at least one quality and/or production parameter of a roving (11) at each roving production position (6) of a roving frame (1).
    [0016] An individual roving production position monitoring system (3) according to claim 15, characterised in that the system (3) further comprises a superordinate computer arrangement (2) for collecting and/or evaluating the measuring results of the plurality of measurement units (4) provided on the roving production positions (6).
    [0017] An individual roving production position monitoring system (3) according to claim 15 or 16, characterised in that the system (3) contains at least one display unit and means for graphically displaying continuously measured quality and/or production parameters, e.g. in the form of a parameter spectrogram, histogram, VL (Variance Length) curve, on the display unit.
    [0018] A method for upgrading a roving frame (1) comprising the steps of:
    - providing a measurement set-up (19) with plurality of measurement units (4) configured to continuously measure at least one quality and/or production parameter of a roving (11) being continuously transported within the roving frame (1);
    - arranging on each roving production position (6) of the roving frame (1) a measurement unit (4).
    [0019] A method for monitoring the roving production in a roving frame (1), characterised by the following steps:
    - continuously measuring at least one quality and/or production parameter of the roving (11) on each roving production position (6) by means of an individual roving production position monitoring system (3) according to one of claim 13 and 14;
    - comparing the continuously measured quality and/or production parameter with target values;
    - initiating an action, as e.g. stopping the roving production or triggering an alarm, in case the continuously measured quality and/or production parameters do not lie within the target values.
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    CN111691028A|2020-09-22|
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