• 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:
    67394SE14ABSTRACT A method for feeding sheets of paper comprises the following steps: providing astack of papers (12) on a storage surface (14) of a paper feeding device (10);providing a flow of air for separating an uppermost sheet of paper (12a) from therest of the stack of papers; determining the vertical position of the uppermostsheet of paper; adjusting the flow of air in dependence on the determined verticalposition of the uppermost sheet of paper; and repeating the steps of determiningthe vertical position of the uppermost sheet of paper and adjusting the flow of air independence on the determined vertical position of the uppermost sheet of paper.By imparting the uppermost sheet of paper a pulsating movement up and down,the problems associated with electrostatic charging are mitigated. (Fig. 6)
    公开号:SE1450340A1
    申请号:SE1450340
    申请日:2014-03-24
    公开日:2015-09-25
    发明作者:Patrik Dahlqvist
    申请人:Plockmatic Int Ab；
    IPC主号:
    专利说明:

    [1] [0001] The present invention relates generally to a device and a method forfeeding sheets of paper in a feeder or sorter, preferably in a vertical friction feeder,and more particularly to a device and a method wherein the sheet of papers arepre-separated by controlled blowing of air.
    [2] [0002] There are essentially two types of feeders for use for after-treatment ofsheets of paper in printing machines and copiers, viz. friction feeder and vacuumfeeders. ln friction feeder, individual sheets are picked from piles of sheets by thefact that a rotary feeding roll is abutted against and pulls the top sheet from thepile, wherein a subjacent friction block normally retains subjacent sheets of thepile. Friction feeders are robust and in general reliable in operation, but occasion-ally more than one sheet at a time may happen to be picked mistakenly. Thefeeding rolls may also leave marks in the sheets. ln vacuum feeders, sheets arepicked from piles by the fact that the top sheet of the pile is sucked against aconveyor belt for transportation of the sheet to subsequent further processing. Thevacuum feeder has not the disadvantages mentioned above of the friction feeder,but the function thereof is more sensitive and a vacuum feeder is considerablymore expensive than a friction feeder.
    [3] [0003] Another disadvantage of friction feeders is that when picking sheets, thetop sheet is drawn against the closest subjacent sheet of the pile, the picked sheetbeing electrostatically charged, which often gives rise to problems in after-treatment steps. The sheets namely get a tendency to stick to each other as aconsequence of the electrostatic charge, which hampers, e.g., putting togetherand adjustment of sheets into a sheaf having straight edges in a stapling andfolding machine when stapling together the sheaf for the formation of a booklet.Since colour printing and colour copying have become more and more common, the described problem of electrostatic charging of the sheets has become even 67394SE greater, since coloured paper has a greater tendency to be charged than paperwith black-and-white print.
    [4] [0004] ln large copiers and printing machines, it is previously known to separatesheets of paper in the paper magazines of the machines by blowing air from theside through the magazine. ln doing so, air is supplied through central supplyducts to exhaust nozzles at the magazine or the magazines from a central fan unitsituated at a distance from the magazine or the magazines.
    [5] [0005] An object of the present invention is to overcome the problems in prior artwith electrostatic charging in friction feeding devices and to provide a frictionfeeding device with improved reliability.
    [6] [0006] According to a first aspect of the invention there is thus provided amethod for feeding sheets of paper, comprising the following steps: providing astack of papers on a storage surface of a paper feeding device; providing a flow ofair for separating an uppermost sheet of paper from the rest of the stack of papers;determining the vertical position of the uppermost sheet of paper; adjusting theflow of air in dependence on the determined vertical position of the uppermostsheet of paper; and repeating the steps of determining the vertical position of theuppermost sheet of paper and adjusting the flow of air in dependence on thedetermined vertical position of the uppermost sheet of paper. By imparting theuppermost sheet of paper a pulsating movement up and down, the problemsassociated with electrostatic charging are mitigated.
    [7] [0007] ln a preferred embodiment of the method, during continuous operation, the flow of air is controlled in cycles with one half of the cycle, preferably the first half of the cycle, with a higher flow of air, and one half of the cycle, preferably thesecond half of the cycle, with a lower flow of air.
    [8] [0008] ln a preferred embodiment of the method, the higher flow of air is essentially two times the lower flow of air. 67394SE
    [9] [0009] ln a preferred embodiment of the method, the vertical position of theuppermost sheet of paper is determined after each cycle with a higher flow of airand if the determined vertical position of the uppermost sheet of paper deviatesfrom a desired position, for the next cycle the higher flow of air will be adjustedupward if the determined vertical position was lower than the desired position anddownward the determined vertical position was higher than the desired position. ltis then preferred, for the next cycle, that the higher flow of air is adjusted upwardor downward if the determined vertical position of the uppermost sheet of paperdeviates from a desired position by more than a predetermined threshold value.
    [10] [0010] Preferably, the duration of each cycle is 2-10 seconds, more preferably4-7 seconds, most preferably essentially 5 seconds. This allows for pulsation of the uppermost sheet of paper.
    [11] [0011] ln a preferred embodiment of the method, during start-up operation, theuppermost sheet of paper is lifted from an initial position and the flow of air isincreased, preferably incrementally, until a desired vertical position of the uppermost sheet of paper is reached.
    [12] [0012] ln a preferred embodiment of the method, the desired position of theuppermost sheet of paper is 5-15, and preferably essentially 10 millimetres, abovean initial position before operation.
    [13] [0013] According to a second aspect of the invention, a paper feeding device isprovided comprising: a storage surface for a stack of papers and being adapted tobe move vertically between a first, lower end position and a second, upper endposition, a feeding roll for feeding papers from their position on the storage surfaceand imparting an uppermost sheet of paper a horizontal displacement, a fanarrangement adapted to provide a curtain of air separating the uppermost sheet ofpaper from the rest of the stack of papers, wherein the paper feeding device ischaracterized by a sensor provided above the stack of papers and adapted andarranged to measure an actual vertical position of the uppermost sheet of paper and a control unit connected to the fan arrangement and to the feeding roll for 67394SE controlling the operation thereof in dependence of a measured actual verticalposition of the uppermost sheet of paper.
    [14] [0014] ln a preferred embodiment, the fan arrangement comprises pairs of fansadapted to provide a flow of air separating the uppermost sheet of paper from therest of the stack.
    [15] [0015] ln a preferred embodiment, the fan arrangement is adapted to blow asubstantially vertical air curtain through the stack of papers so as to separate the uppermost sheet of paper from the rest of the sheets of the stack of papers.
    [16] [0016] ln a preferred embodiment, the sensor is an ultrasound sensor, whichpreferably is approximately centrally above the storage surface.
    [17] [0017] ln a preferred embodiment, the control unit is connected to the fanarrangement, to the feeding roll and to a mechanical elevator for the storagesurface for controlling the operation thereof in accordance with the methodaccording to the method according to the invention.
    [18] [0018] A paper processing machine is also provided which comprises a paper feeding device according to any one of claims.
    [19] [0019] The invention is now described, by way of example, with reference to the accompanying drawings, in which: Figs. 1 and 2 show an embodiment of a vertical friction sorter from the front and ina side view, respectively, which is provided with a paper feeding device according to the invention; Fig. 3 is a side view of a feeder provided with two paper feeding devices according to the invention;Fig. 4 is a plan view of a paper feeding device according to the invention; Fig. 5 is a side view of the paper feeding device of Fig. 4 before operation; 67394SE Fig. 6 is a side view of the paper feeding device of Fig. 4 in a first half of an operation cycle; Fig. 7 is a side view of the paper feeding device of Fig. 4 in a second half of an operation cycle; and Fig. 8 is an overall block diagram showing the different components of a paperprocessing machine comprising a paper feeding device according to the invention.
    [20] [0020] ln the following, a detailed description of a paper feeding deviceaccording to the invention will be given. Special references given in thedescription, such as “up” or “down”, refer to directions during normal operation of the device.
    [21] [0021] Reference is first made to Figs. 1 and 2 showing a vertical friction sorterin which a paper feeding device according to the invention is provided. The verticalfriction sorter, generally designated 1, comprises a plurality of stations 10 arrangedabove each other and resting on a control cubicle 3 containing other equipment ofthe vertical friction sorter. Each station 10 is intended to house a pile of sheets 12of paper lying on each other, shown in the top station in Figure 1. Each station 10comprises a paper magazine having a storage surface 14 on which the pile ofsheets rests. From the paper magazines, sheets are fed out or are picked, one ata time, using feeding rolls 16, as will be described below with reference to Figs.3-6 that are brought into frictional engagement with the top sheet of the pile 12, such as shown in Figs. 4-6. ln Figure 2, an operating device for the control of the machine is also shown, in theform of an LCD screen 5 for displaying miscellaneous information about the operation of the machine as well as a number of control buttons.
    [22] [0022] ln Fig. 3 a machine in the form of a feeder 1' is shown, which is provided with two paper feeding devices 10 according to the invention. 67394SE
    [23] [0023] A plan view of a paper feeding device 10 according to the invention isshown in Fig. 4. A stack of papers 12 is provided on a storage surface 14 in theform of a mechanical elevator adapted to be move vertically between a first, lowerend position and a second, upper end position. ln this context, the term “stack ofpapers” should be interpreted as at least two papers, but usually the stack ofpapers comprises a much higher number of sheets. A feeding roll 16 extendsacross essentially the entire with of the stack of papers 12 and comprises in theshown embodiment four sub-rolls 16a-d. The feeding roll is provided for thefeeding of papers from their position on the storage surface 14 and imparts theuppermost sheet of paper 12a a horizontal displacement to the left, as shown in the figures.
    [24] [0024] The feeding roll 16 is also provided with a separations block 16b adaptedto provide friction to ensure that only a single sheet of paper is fed by the feeding roll.
    [25] [0025] The paper feeding device 10 also comprises a fan arrangement in theform of pairs of fans 18a, 18b adapted to provide a flow of air separating theuppermost sheet of paper 12a from the rest of the stack. Each fan is preferablyprovided with a nozzle having a slot-shaped exhaust opening substantially verticalor orientated substantially perpendicularly to the storage surface, see Figs. 4-6, forblowing a substantially vertical air curtain through the stack of sheets so as toseparate the sheets of the stack of papers 12.
    [26] [0026] The air flow from the fans 18a, 18b is adjustable by means of a controlunit 6, which is schematically shown in Fig. 8. The control unit is connected to thefans and to the feeding roll as well as to the mechanical elevator of the storagesurface for controlling the operation thereof as well as to the operating device 5 forthe input and output of control parameters etc. There are at least two controllableair flow velocities, although there is preferably more than two controllable air flowvelocities or step-less adjustment of the air flow velocities. By means of thecontrollable air flow velocities the position of the uppermost sheet of paper 12a is controlled, as will be explained below. 67394SE
    [27] [0027] A sensor 20 is provided a distance above the stack of papers 12. Thesensor 20, which preferably is an ultrasound sensor, is adapted and arranged tomeasure the actual vertical position of the uppermost sheet of paper 12a. ln thiscontext, the term “the vertical position of the uppermost sheet of paper” should beinterpreted as the position of the portion of the sheet of paper directly below thesensor. Thus, other portions of the uppermost sheet of paper may have othervertical positions, as shown in Figs. 6 and 7. lt is therefore preferred to provide thesensor 20 approximately centrally above the storage surface 14 and thereby thestack of papers 12.
    [28] [0028] A method of feeding papers will now be described in detail with referenceto Figs. 5-7, wherein a stack of papers 12 has been provided on the storagesurface 14. When the operation of the paper feeding device is started, a mechani-cal elevator of the storage surface 14 brings the stack of papers 12 up to anoperating position shown in Fig. 5. ln this position, the uppermost sheet of paper12a is in contact with the feeding roll 16. The mechanical elevator of the storagesurface 14 is then controlled so that this position is constant during operation, i.e.that the uppermost sheet of paper 12a is in contact with the feeding roll 16,irrespectively of the thickness of the stack of papers.
    [29] [0029] After reaching the operating position shown in Fig. 5, a start-upprocedure is initiated wherein the fans 18a, 18b are started and are controlled tooperate in a start-up mode with low power for a time period, such as a fewseconds, for example 2 seconds. This low power may initially be adjusted to 10 %of full power. The vertical position of the uppermost sheet of paper 12a, i.e., theactual position, is then measured by means of the sensor 20. ln the positionshown in Fig. 5, i.e., when the uppermost sheet of paper is in contact with thefeeding roll but before operation of the fans, this distance between the sensor 20and uppermost sheet of paper 12a is designated “Xbase~_ ln Figs. 6 and 7, afteroperation has begun, the distance between the sensor 20 and the uppermost sheet of paper 12a is designated “Xcurrenfï 67394SE
    [30] [0030] ln an alternative embodiment, the value Xbase may be assumed to beconstant between operations and therefore be a fixed value.
    [31] [0031] By means of the knowledge of Xbase and the current value of Xcurrent, theamount of lifting of the uppermost sheet of paper 12a, designated Xfift in thefigures, can be determined as follows: Xlift = Xbase ' Xcurrent
    [32] [0032] The control algorithm includes a predetermined desired verticaladjustment of the uppermost sheet of paper 12a, i.e., a desired value of Xcurrent,called Xdesired. This value Xdesired may be based on experience and may be 10millimetres, for example. This value may also vary depending on the quality of thepaper, the kind of printing, the size of the sheets of paper etc.
    [33] [0033] The position error, i.e., difference between the actual adjustment Xcurrentand the desired adjustment Xdesired of the vertical position of the uppermost sheetof paper 12a is then determined by means of the control unit 6. The position erroris compared to a threshold value Xthreshokj, such as 0.1 millimetres, and if theabsolute value of the position error is above this threshold value, the fans areoperated with an adjusted power for a predetermined period of time. ln otherwords, during start-up operation, wherein the uppermost sheet of paper 12a islifted from the position shown in Fig. 5, if Xfift < Xdesired, the power of the fans 18a,18b is increased, preferably incrementally, until Xfift 2 Xdesired. ln a preferredembodiment, the increment is 10 % of full power. This means that the fan powerstarts at 10 % of full power, then increases to 20 %, 30 % etc. until the sensor 20senses that the uppermost sheet of paper has been lifted the desired distance Xdesired.
    [34] [0034] When the control unit determines that the start-up operation has beencompleted, the feeding roll 16 is activated to transport the uppermost sheet of paper 12a from the stack of papers 12. The thickness of the stack of papers 12thereby decreases, whereby the mechanical elevator of the storage surface 14 adjusts the vertical position of the storage surface upward until the uppermost 67394SE sheet of paper abuts the feeding roll 16. Also, electrostatic charge begins to buildup as soon as feeding has been initiated.
    [35] [0035] After feeding has been initiated, the operation of the fans 18a, 18bchanges to a continuous operation mode. ln this mode, the fan control is in cycleswith the first half of the cycle with a higher power Phigh and the second half of thecycle with a lower power Pjow. ln a preferred embodiment, Phigh is two times Pjow.The initial value of Phigh may preferably be two times the final fan power in the start-up procedure.
    [36] [0036] By means of this continuous mode of operation, the upper sheets ofpaper are forced to pulsate up and down. By starting the cycle with a higherpower, the upper sheets of paper are further separated, as shown in Fig. 6.
    [37] [0037] After the first half of each cycle, such as 2.5 seconds, the sensor sensesthe distance to the uppermost sheet of paper 12a. lf the calculated value of Xjiftdeviates from Xdesired with more than the predetermined threshold value, for thenext cycle the higher power Phigh will be adjusted upward or downward, forexample by 10 % of the full power, depending on whether Xjift was higher or lowerthan Xdesired.
    [38] [0038] A second half of the cycle then follows, with a duration of 2.5 seconds,for example, wherein the fan power is Pjow. The uppermost sheet of paper then sinks to a lower position shown in Fig. 7.
    [39] [0039] A new cycle is then started, with a first half with a possibly adjusted Phigh.The sensor again senses the distance to the uppermost sheet of paper and Phighfor the next cycle is possible adjusted. The first cycle is followed by a second cyclewith a possibly adjusted Pjow. This continuous operation mode continues untiloperation is interrupted.
    [40] [0040] Preferred embodiments of a method for feeding sheets of papers and apaper feeding device have been described. lt will be appreciated that these can bemodified without departing from the inventive idea as defined by the appended claims. Thus, although reference has been made to “the uppermost sheet of 67394SE paper”, it will be appreciated that two, three or even more sheets of paper may belifted by means of the air flow from the fans. This does not affect the functionality of the inventive method and device.
    [41] [0041] The paper feeding device has been described as part of a vertical feederor sorter comprising a p|ura|ity of paper feeding devices. lt will be appreciated thatthe inventive paper feeding device may be provided in any kind of machineadapted to process sheets of paper, such as paper co|ators and cover feeders.
    [42] [0042] A specific fan arrangement has been shown and described. lt will beappreciated that any kind of fan arrangement will be possible as long as the fanpower can be regulated and the stream of air lifts the uppermost sheet of paper inthe stack of paper.
    权利要求:
    Claims (15)
    [1] 1. A method for feeding sheets of paper, comprising the following steps: - providing a stack of papers (12) on a storage surface (14) of a paper feedingdevice (10); - providing a flow of air for separating an uppermost sheet of paper (12a) fromthe rest of the stack of papers; - determining the vertical position of the uppermost sheet of paper; - adjusting the flow of air in dependence on the determined vertical position of the uppermost sheet of paper; and - repeating the steps of determining the vertical position of the uppermostsheet of paper and adjusting the flow of air in dependence on the determined vertical position of the uppermost sheet of paper.
    [2] 2. The method according to claim 1, wherein, during continuous operation,the flow of air is controlled in cycles with one half of the cycle, preferably the firsthalf of the cycle, with a higher flow of air (Phigh), and one half of the cycle, preferably the second half of the cycle, with a lower flow of air (HOW).
    [3] 3. The method according to claim 2, wherein the higher flow of air (Phigh) is essentially two times the lower flow of air (Piow).
    [4] 4. The method according to claim 2 or 3, wherein the vertical position ofthe uppermost sheet of paper is determined after each cycle with a higher flow ofair and if the determined vertical position (Xiifi) of the uppermost sheet of paperdeviates from a desired position (Xdesired), for the next cycle the higher flow of air(Phigh) will be adjusted upward if the determined vertical position (Xfift) was lowerthan the desired position (Xdesired).and downward the determined vertical position (Xian) was higher than the desired position (Xdesired). 67394SE12
    [5] 5. The method according to claim 4, wherein, for the next cycle, the higherflow of air (Phigh) will be adjusted upward or downward if the determined verticalposition (X|ift)of the uppermost sheet of paper deviates from a desired position (Xdesired) by more than a predetermined threshold value (Xthreshoid).
    [6] 6. The method according to any one of claims 2-5, wherein the duration ofeach cycle is 2-10 seconds, more preferably 4-7 seconds, most preferably essentially 5 seconds.
    [7] 7. The method according to any one of claims 1-6, wherein, during start-upoperation, the uppermost sheet of paper (12a) is lifted from an initial position(Xbase) and the flow of air is increased, preferably incrementally, until a desired vertical position (Xdesired) of the uppermost sheet of paper is reached.
    [8] 8. The method according to any one of claims 4, 5, and 7, wherein thedesired position (Xdesired) is 5-15, and preferably essentially 10 millimetres, above an initial position (Xbase) before operation.
    [9] 9. A paper feeding device (10) comprising: - a storage surface (14) for a stack of papers (12) and being adapted to bemove vertically between a first, lower end position and a second, upper end position, - a feeding roll (16) for feeding papers from their position on the storagesurface (14) and imparting an uppermost sheet of paper (12a) a horizontal displacement, - a fan arrangement (18a, 18b) adapted to provide a curtain of air separatingthe uppermost sheet of paper (12a) from the rest of the stack of papers, characterized by - a sensor (20) provided above the stack of papers (12) and adapted andarranged to measure an actual vertical position of the uppermost sheet of paper (12a) and 67394SE13 - a control unit (6) connected to the fan arrangement and to the feeding roll forcontrolling the operation thereof in dependence of a measured actual vertical position of the uppermost sheet of paper.
    [10] 10. The paper feeding device according to claim 9, wherein the fanarrangement comprises pairs of fans (18a, 18b) adapted to provide a flow of airseparating the uppermost sheet of paper (12a) from the rest of the stack
    [11] 11. The paper feeding device according to claim 9 or 10, wherein the fanarrangement is adapted to blow a substantially vertical air curtain through thestack of papers (12) so as to separate the uppermost sheet of paper (12a) fromthe rest of the sheets of the stack of papers.
    [12] 12. The paper feeding device according to any one of claims 9-11, wherein the sensor (20) is an ultrasound sensor.
    [13] 13. The paper feeding device according to any one of claims 9-12, wherein the sensor (20) is provided approximately centrally above the storage surface (14).
    [14] 14. The paper processing machine according to any one of claims 9-13,wherein the control unit (6) is connected to the fan arrangement (18a, 18b), to thefeeding roll (16) and to a mechanical elevator for the storage surface (14) forcontrolling the operation thereof in accordance with the method according to claim1.
    [15] 15. A paper processing machine comprising a paper feeding device (10) according to any one of claims 9-14.
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    同族专利:
    公开号 | 公开日
    EP3122673A4|2018-03-07|
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    EP3122673A1|2017-02-01|
    US20170008716A1|2017-01-12|
    US9890004B2|2018-02-13|
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    EP3122673B1|2020-02-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP4412009B2|2003-09-09|2010-02-10|富士ゼロックス株式会社|Sheet feeding device|
    JP2006293067A|2005-04-12|2006-10-26|Canon Inc|Image forming apparatus|
    US7500665B2|2005-09-28|2009-03-10|Xerox Corporation|Method and device for improving pressure control in a sheet feeder|
    US7591459B2|2006-04-03|2009-09-22|Canon Kabushiki Kaisha|Sheet feeding apparatus and image forming apparatus|
    JP2007331944A|2006-05-15|2007-12-27|Canon Inc|Sheet feeding device and image forming device|
    SE530791C2|2007-01-18|2008-09-16|Plockmatic Int Ab|Device for separating sheets of paper by blowing air|
    JP5233633B2|2008-12-11|2013-07-10|コニカミノルタビジネステクノロジーズ株式会社|Paper feeding device, paper feeding unit, and image forming apparatus|
    JP5262792B2|2009-02-13|2013-08-14|コニカミノルタビジネステクノロジーズ株式会社|Paper feeding device and image forming apparatus|
    WO2011052059A1|2009-10-29|2011-05-05|キヤノン株式会社|Sheet feeding device|
    JP5434601B2|2010-01-05|2014-03-05|コニカミノルタ株式会社|Paper feeding device and image forming system|
    JP5463940B2|2010-02-03|2014-04-09|株式会社リコー|Sheet feeding apparatus and image forming apparatus|
    JP5720646B2|2012-09-03|2015-05-20|コニカミノルタ株式会社|Paper feeding device and image forming apparatus|
    JP6347066B2|2013-07-24|2018-06-27|コニカミノルタ株式会社|Sheet supply apparatus and image forming apparatus|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1450340A|SE539502C2|2014-03-24|2014-03-24|Device and method of paper feeding and paper processing machine|SE1450340A| SE539502C2|2014-03-24|2014-03-24|Device and method of paper feeding and paper processing machine|
    PCT/SE2015/050341| WO2015147730A1|2014-03-24|2015-03-23|Device and method for feeding papers|
    EP15768631.2A| EP3122673B1|2014-03-24|2015-03-23|Device and method for feeding papers|
    US15/273,766| US9890004B2|2014-03-24|2016-09-23|Device and method for feeding papers|
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