• 专利附录
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    • 专利摘要:
    The invention relates to a method and a device for controlling the electronic ignition of a combustion chamber of a gas fixation tool intended to optimize the quality of the firing of fasteners by the tool. According to the principle of the invention, the triggering of the ignition of the chamber to cause firing is controlled, provided that the time between the moment the user puts the tool in contact with a work surface and the moment where it presses an actuation trigger of the tool is greater than a predefined time delay, to ensure optimal filling of the combustion chamber by the fuel gas. According to one particularity of the invention, the triggering of the ignition is authorized with the additional condition that a signal of medium ignition voltage is greater than a trigger threshold voltage.
    公开号:FR3045784A1
    申请号:FR1562728
    申请日:2015-12-18
    公开日:2017-06-23
    发明作者:Pascale Grandjean；Pierre Cordeiro；Patrick Herelier；Frederic Nayrac；Alain Vettoretti
    申请人:Illinois Tool Works Inc；
    IPC主号:
    专利说明:

    Method of controlling actuation of a gas fastening tool and corresponding device
    FIELD OF THE INVENTION The invention is in the field of portable tools for fastening parts by means of nails or staples propelled by a driving piston, under the effect of the combustion of a gas . The invention more specifically relates to a method and a device for controlling the actuation of such a tool to trigger the firing of a fastener (nail, staple).
    Background of the invention
    In a known manner, a gas fastening tool comprises, in a housing, an internal combustion engine for propelling a driving piston of a fastening element, such as a nail or a staple, intended for anchor in a constituent material of a work surface. The engine comprises at least one internal combustion chamber for containing a mixture of air and combustible gas ignited by an internal ignition device causes the propulsion of a piston intended to drive the fastener element to the output of a tip guide extending to the front of the housing. The combustible gas supply of the combustion chamber is effected by means of an injection member from a gas cartridge. Such a tool also comprises an actuation trigger for controlling the firing trigger to propel a fastener via the piston. Activation of this trigger by a user causes the generation of an electric arc in the combustion chamber by means of the ignition device.
    The applicant has found that this type of tool can provide poor quality shots, characterized by a partial depression of the nail or the staple in the material, following the activation of the actuation trigger of the tool by an user.
    In known manner, the mechanical support of the tool on a work surface triggers a preparation process at the end of which the tool is said to be "ready to shoot". This preparation process comprises the following steps: percussion of the fuel gas cartridge, filling of the combustion chamber by displacement of the gas from the cartridge at the same time purging the chamber. Pressing the trigger during the preparation process has the effect of interrupting the filling of the combustion chamber by closing the chamber. In case of interruption of the process, the filling of the chamber and its purging are partial, so that the tool is not in optimal shooting conditions. If the user moves too quickly the support of the tool and the activation of the trigger of the tool, a poor quality shot will be triggered. Therefore, there is a need to ensure optimum firing conditions allowing reliable depressing of the fastener in the work area.
    Object and summary of the invention
    In order to overcome the drawbacks of the prior art mentioned above, the present invention proposes a method and an electronic ignition control device of an internal combustion chamber of a gas fixation tool, according to which the firing is triggered when activating the trigger, provided that the filling time of the combustion chamber is optimal. For this, a mechanism to prohibit the trigger firing if a time condition is not met. This condition relates to the time elapsed between the detection of a first mechanical event triggering the filling of the chamber with the gas, for example the support of the tool on the working surface, and a second mechanical event corresponding to the trigger trigger indicating the user's desire to fire.
    The method according to the invention comprises the following steps: detection of a first mechanical event at a first instant; Detecting a second mechanical event at a second instant; Generating a control signal for triggering ignition of the combustion chamber following the detection of the second mechanical event, if the duration between the first and second mechanical events is greater than a first predetermined threshold.
    Advantageously, the firing of the ignition of the combustion chamber can take place only if the duration of filling of the combustion chamber between the first instant and the second instant is greater than a first predetermined threshold corresponding to a duration of optimal filling of the combustion chamber.
    In the case where a user chases too quickly the support of the tool (first mechanical event) and the activation of the trigger of the tool (second mechanical event) to trigger the shot, by not respecting a minimum delay corresponding to the first threshold, the ignition of the ignition of the combustion chamber is not allowed. Indeed, if the time measured between the moment the user puts the tool on the work surface and the moment when he presses the trigger of the tool is too short, the combustion chamber will not had enough time to fill up with fuel gas to bring about quality fire.
    According to a particular embodiment of the invention, the step of generating the control signal comprises the following sub-steps: time measurement for measuring the time elapsed between the first instant and the second instant; • time comparison to compare the elapsed time and the first predetermined threshold; and • generating said signal if said elapsed time is greater than the first threshold.
    By preventing triggering of the ignition of the chamber in the case where the measured time between the first and second instants is less than the first threshold, this avoids poor quality shots characterized by a partial depression of the nail due to a lack of power. In this way, it is ensured that, upon activation of the trigger, the combustion chamber is sufficiently filled to generate an explosion or combustion power sufficient to ensure a good quality of fire. According to another embodiment of the invention, the step of generating the control signal comprises the following substeps: triggering a delay of a duration equal to said threshold during the detection of the first mechanical event; and • generating said control signal if the detection of the second event occurs after the end of the delay.
    Advantageously, firing is allowed only if the timing has been completely elapsed, to allow a filling of the combustion chamber sufficient to ensure a quality shot at the moment the user presses the trigger (second mechanical event).
    According to one particularity of the invention, the step of generating the ignition trigger command is performed only on the additional condition that the duration between the first and second mechanical events is less than a second predetermined threshold.
    The second predetermined threshold corresponding to a maximum filling time beyond which the shooting conditions are no longer optimal. Thus, if the user presses the trigger too late after starting the tool (first mechanical event), the trigger control signal will not be generated so as to avoid a poor quality shot. Indeed, beyond a certain filling time, the mixing conditions of the combustion gas in the chamber are no longer optimal.
    According to one particularity of the invention, firing is authorized if the effective filling time of the combustion chamber corresponding to the duration between the first and second instants is within a confidence interval whose lower and upper bounds respectively correspond to the first and second instants. and second thresholds, this confidence interval being determined to ensure optimal shooting conditions.
    The method further includes an adjusting step for adjusting at least one of the thresholds, based on at least one temperature parameter. By way of non-limiting example, the temperature parameter can be selected from any of the following parameters: ambient temperature, known as working temperature, temperature in the vicinity of the combustion chamber, temperature inside the combustion chamber , or temperature in the vicinity of another area of the tool, such as a possible evaporator.
    The value of the delay time for which the shooting conditions are optimal depends on at least one of the temperature parameters above. Thus, taking into account at least one temperature parameter advantageously makes it possible to adjust more finely the value of the delay time and thus to further improve the quality of the shot.
    According to one embodiment, only the first threshold is adjusted during the adjustment step, while according to another embodiment, the first and second thresholds are adjusted during the adjustment step.
    The method may furthermore comprise: a step of generating an initial ignition voltage initiated as soon as the first mechanical event is detected at the first moment; A voltage comparison step for comparing the average ignition voltage with respect to a reference trigger voltage,
    In this case, the trip command is generated with the additional condition that the average ignition voltage has an amplitude greater than the reference trigger voltage.
    The fact of starting to generate the medium voltage ignition signal as soon as the first mechanical event is detected at the first instant makes it possible to obtain a shot immediately, when the user presses the trigger, provided that the medium voltage signal ignition has reached the trip threshold value. This feature is particularly advantageous with respect to known solutions of the prior art for which the medium ignition voltage is generated only after the user has pressed the trigger. For example, pressing the tool on a work surface instantly causes the start of the generation of the medium voltage ignition signal without waiting for activation of the trigger.
    The method may further comprise, between the step of generating the medium ignition voltage and the step of comparing the voltage of the average ignition voltage signal, a step of converting said average ignition voltage signal.
    Another advantage of the invention lies in the precision of the measurement of the average ignition voltage due to the conversion step. The improved accuracy of the measurement carried out ensures a constant energy in the spark produced regardless of the ignition device considered.
    Advantageously, the conversion step converts the analog medium voltage signal into a digital value that can be processed during the conversion step.
    The present invention also relates to an electronic ignition control device of an internal combustion chamber of a gas fixation tool, characterized in that it comprises: first detection means for detecting a first mechanical event at a first moment; Second detection means for detecting a second mechanical event at a second instant; Means for generating a control signal for triggering ignition of the combustion chamber following the detection of the second mechanical event, if the duration between the first and second mechanical events is greater than a first predetermined threshold.
    According to a particular embodiment of the invention, the means for generating the control signal comprise: time measuring means adapted to measure the time elapsed between the first instant and the second instant; Time comparison means for comparing the elapsed time and the first predetermined threshold; and control generating means for generating the control signal if said elapsed time is greater than the first threshold.
    According to one particularity of the invention, the first detection means comprise an expansion switch controlled by the second event (activation of a detent of the tool), the second detection means comprise a support switch controlled by the first event. (support of the tool on a work surface), the trigger switch and the support switch being connected to the time measuring means.
    According to another particular embodiment of the invention, the means for generating the control signal comprise delay means of a duration equal to the first threshold, the delay means being adapted to trigger the delay when the first signal is detected. mechanical event and the generation means are adapted to generate the control signal at the end of the delay.
    According to a particularity of the invention, the first detection means comprise an expansion switch controlled by the activation of a trigger of the tool (second mechanical event), the second detection means comprise a support switch controlled by a support of the tool on a work surface (first mechanical event), the delay means comprise a timing module coupled to a delay switch connected in series between the expansion switch and the support switch .
    According to a feature of the invention, the control signal generating means are adapted to generate the control signal with the additional condition that the duration between the first and second mechanical events is less than a second predetermined threshold.
    According to another feature of the invention, the device further comprises adjustment means for adjusting at least one of said thresholds as a function of at least one temperature parameter.
    According to another feature of the invention, the device further comprises: means for generating a medium ignition voltage adapted to generate the medium voltage, as soon as the first mechanical event is detected at the first instant; Voltage comparison means for comparing the average ignition voltage with respect to a reference trigger voltage,
    In this case, the tripping command generation means are adapted to generate said command, if the amplitude of the average ignition voltage signal is greater than the reference trigger voltage.
    According to another feature of the invention, the device further comprises voltage conversion means for converting the average ignition voltage into a voltage comparable to the reference trigger voltage.
    Advantageously, the device is arranged in a removable block. The integration of the ignition control device in the same removable block allows maintenance and easy replacement of this block during repair or maintenance operations.
    The present invention also relates to a gas fastening tool comprising an electronic ignition device according to the characteristics described above.
    BRIEF DESCRIPTION OF THE DRAWINGS Other characteristics and advantages of the present invention will emerge from the description given below, with reference to the drawings which illustrate an embodiment of this embodiment devoid of any limiting character and in which: FIG. 1 schematically illustrates a gas fastening tool in accordance with the state of the art; FIG. 2 illustrates a device for igniting the combustion chamber of a gas fastening tool in accordance with the state of the art; FIG. 3 illustrates a device for igniting the combustion chamber of a gas fixation tool comprising the electronic ignition control device according to a first embodiment of the invention; FIG. 4 illustrates the steps; of the ignition control method of the combustion chamber according to a first embodiment of the invention, - Figure 5 is a timing diagram illustrating sequences of events occurring during the use of a fastening tool to gas including the ignition control device implementing the delay means according to the first embodiment of the invention; - Figure 6 is a detailed block diagram of the ignition control device of the combustion chamber; according to the first embodiment of the invention, and - FIG. 7 illustrates means for delaying and generating a control signal according to a second embodiment. tion; and FIG. 8 is a timing diagram illustrating a series of events occurring during the use of a gas fastening tool including the ignition control device implementing the delay means according to the second embodiment.
    detailed description
    FIG. 1 depicts, according to the state of the art, a gas fastening tool, such as a nail gun, having a casing 1, in which there is an internal combustion engine 2 with a combustion chamber 3 intended to contain a mixture of air and combustible gas, the firing of which causes the propulsion of a piston intended to drive a fastener such as a nail or a staple extracted from a feed magazine 4 , the fastening element being adapted to anchor in a support material at the outlet of a guide-tip 5 extending at the front of the housing 1. The tool housing has an axis 6, along which the driving piston moves and in the guide-point 5, the fastening elements. The fuel gas supply to the combustion chamber 3 is effected by means of an injection device, for example mechanical or electrical (of the solenoid valve type), from a fuel gas cartridge. The gas cartridge can be connected to a first pre-combustion chamber, followed by the combustion chamber, the latter being in connection with the piston for propelling the nails out of the tip guide.
    Such a tool also comprises a handle 9 for handling and firing, on which is mounted a trigger 10 for actuating the tool intended to control the trigger firing.
    This tool further comprises an electronic ignition device for igniting the combustion chamber 3, when the trigger 10 of the tool is actuated by a user.
    As illustrated in FIG. 2, the electronic ignition device according to the current state of the art, comprises a low-voltage power source 20 adapted to deliver a low-voltage electrical signal Vi, a medium-voltage generator of ignition 24 adapted to deliver a medium voltage electrical ignition signal V2, a high-voltage spark generator 28 adapted to deliver a high-voltage spark electrical signal V3 and a spark plug 29 adapted to deliver an electric arc in the combustion chamber to initiate the combustion of the gas.
    Subsequently, the term "high voltage" will mean "high spark voltage" and the term "medium voltage" will mean "medium ignition voltage".
    The low-voltage power source 20 is constituted, for example, by a battery delivering a DC voltage of 6V. The medium-voltage ignition generator 24 is adapted to provide a medium voltage electrical ignition signal V2 of an amplitude of the order of 250V, from the low-voltage electrical signal. The medium-voltage ignition generator , based on MOS transistors, is associated with a diode-based pulse transformer 25 and delivers the average ignition voltage signal V2 across a capacitor 26 for storing energy. The high voltage generator includes a transformer having a primary winding and a secondary winding for generating a high voltage signal V3 across the spark plug 29.
    A switch 21 associated with the trigger 10 is connected in series between the low-voltage energy source 20 and the medium-voltage ignition generator 24, so that when the trigger 10 is actuated by the user, the source Low voltage energy electrically supplies the medium voltage ignition generator. Consequently, the actuation of this switch 21 causes the capacitor 26 to be charged. When the voltage at the terminals of the capacitor reaches a predetermined threshold Vs, a trigger device 27 based on an electronic component is triggered by the voltage at its terminals. , brutally discharges the capacitor 26 in the primary winding of the transformer of the high voltage generator 28 creating in the secondary winding of this transformer a high voltage electrical signal V3 of amplitude greater than 20 kV. It follows the generation of a spark at the spark plug 29 for ignition of the combustion chamber 3.
    This ignition mechanism has the following disadvantage. If the user chases too quickly the support of the tool and the activation of the trigger to trigger fire, ignition of the combustion chamber will occur, while it is partially filled with gas, does not provide sufficient combustion power to provide quality fire which will result in partial penetration of the fasteners into the work area.
    In order to guarantee optimal combustion conditions, the ignition device known from the prior art is adapted to receive an electronic ignition control device for the combustion chamber of the tool according to the invention as illustrated in FIG. 3.
    The ignition control device according to the invention comprises a first switch 21 controlled by the actuation of the trigger 10 (second mechanical event), a second switch 22 controlled by the support of the tip guide 5 on a work surface (first mechanical event), and a microcontroller 30 designed to interface with the first and second switches.
    The second switch 22 is connected in series between the low-voltage power source 20 and the medium-voltage ignition generator 24, so that the medium-voltage ignition generator 24 is powered by the energy source at low voltage 20, when the guide tip 5 is pressed against the work surface at a first time ti. The microcontroller 30 is designed to interface with the second switch to receive a signal V22 for detecting the support of the tool at the first instant ti from which the microcontroller measures the elapsed time.
    The first switch 21 is connected in series with a low-voltage power source 20 ', so as to deliver to the microcontroller a detection signal V2i for actuating the trigger, when the trigger 10 is actuated by the user to a second moment t2. The microcontroller 30 is designed to interface with the first switch 21, so as to receive the operation detection signal V2i at the second time t2.
    The microcontroller 30 is designed to receive in real time a charge signal V2 supplied across the capacitor 26, convert this signal into a converted signal V'2 and compare the latter with a trigger threshold voltage Vd (conversion means and comparison 32).
    The microcontroller 30 is adapted to measure a delay Δί between the first instant ti and the second instant t2 and to compare this delay with a reference timing value.
    The microcontroller 30 is also adapted to supply a control signal S to a controlled tripping device 27 'disposed between the medium voltage ignition generator 24 and the high voltage generator 28 (generating means of the control 35).
    The method for controlling the electronic ignition of the combustion chamber 3 according to the present invention will now be described with reference to FIGS. 3 and 4. FIG. 4 illustrates the steps of the ignition control method of the combustion chamber according to one embodiment of the invention. The support of the tip guide 5 of the tool against a work surface, at a first instant ti, is an example of a first mechanical event which causes the percussion of the fuel gas cartridge and the displacement of this gas towards the chamber pre-combustion and the combustion chamber 3, at the same time purging these chambers. Thus, at this first moment ti takes place the start of the filling and purge of the combustion chamber by the gas. The mechanical support of the tool on the work surface has the effect of switching the second switch 22 associated with the guide-point 5. This support is detected at the first moment ti, during a first detection step Ei, by the microcontroller 30 interfaced to the second switch. The microcontroller comprises a memory intended to record a first time value corresponding to the first instant ti. At this same first instant ti, the tilting of the second switch 22 has the effect of supplying power to the generator of medium ignition voltage from the low-voltage energy source. The electrical medium voltage ignition signal V2 is generated during a medium ignition voltage generation step E2, during which the capacitor 26 is charged.
    Advantageously, starting the charge of the capacitor as soon as the tool is pressed against the work area offers the possibility of pre-charging the capacitor before the user presses the trigger. This feature of the invention avoids a delay between the moment when the trigger is activated and the moment when the average ignition voltage is generated, knowing that the time required to generate the average ignition voltage is generally between 30 ms. and 60 ms. In this way, a shot can be obtained instantly, when the user presses on the trigger, which is not the case with the known gas fastening tools of the prior art for which the charging of the capacitor is initiated only after pressing the trigger causing a delay of 30 to 60 ms.
    According to a feature of the present invention, the microcontroller is adapted to measure the electrical signal of medium ignition voltage V2 during a voltage measurement step E3.
    The microcontroller is adapted to convert this measured signal into a converted signal V'2 of amplitude comparable to the trigger threshold voltage Vd during a conversion step E4.
    The microcontroller is adapted to compare the converted signal V'2 with respect to a trigger threshold voltage Vd during a voltage comparison step E5. Exceeding this threshold voltage is necessary but not sufficient to trigger the ignition of the combustion chamber. At a second time t2, the user presses the trigger 10 for actuating the tool indicating a willingness of the user to trigger a shot. This second mechanical event has the effect of closing the combustion chamber and thus stop its filling with gas. Pressing the trigger causes the switchover of the first switch 21, this switchover being detected by the microcontroller 30, during a second detection step E7. The microcontroller 30 is adapted to measure, at this same second time, the time elapsed since the first instant ti. This measurement is performed during a time measurement step E9. This delay At = t2-ti corresponds to the actual filling time Δί of the combustion chamber by the gas, between the moment when the user put the tool mechanically supported on the work surface and the moment when the user pressed the trigger to activate the trigger. During a time comparison step In, the delay Δί measured between the first instant ti and the second instant t2, at a first predetermined threshold Δί ^ to guarantee optimal firing conditions. This first value Δί ^ corresponds to the minimum gas filling time to obtain a combustion power necessary for a complete depression of the fastener element in the working zone.
    According to one particularity of the invention, the firing of the ignition of the combustion chamber can only take place if the effective filling time Δί is greater than the first threshold Δί ^. Thus, it avoids that a support on the relaxation too fast causes a poor quality shot.
    For example, if the action on the trigger was too anticipated by the user and did not allow time for the mixture of air and fuel gas to sufficiently fill the volume of the combustion chamber, the spark is not triggered, to prevent an explosion of poor quality generates imperfect nailing and unnecessary damage to the part to be fixed.
    According to a particular mode, there is also a second predetermined threshold AtR2, corresponding to a filling time of the combustion chamber beyond which the firing conditions are no longer optimal.
    Thus, according to a particular embodiment of the invention, the method comprises an additional time comparison step, in which it is further tested that the measured Δί delay does not exceed the second threshold AtR2, so as to guarantee a shot of good quality.
    When this additional condition is applied, firing can only be fired if the measured delay time At = t2-tl is within a confidence interval, whose lower and upper bounds correspond respectively to the minimum and maximum delay values, such as that: AtRi <Δί <Δίβ2 ·
    The microcontroller 30 is adapted to store the value of the first threshold AtRI (first value) and optionally the value of the second threshold AtR2 (second value), in which case the first and second values define the confidence interval guaranteeing optimal combustion conditions for a quality shot.
    According to a feature of the present invention, the value of the first threshold AtRi and / or the second AtR2 threshold is adjusted during an adjustment step (not shown), as a function of at least one temperature parameter T such that the ambient temperature known as working temperature, as provided by a temperature sensor 40.
    According to a particular embodiment, the first threshold is adjusted. According to another embodiment, the value of the second threshold is adjusted alone or in combination with the adjustment of the value of the first threshold, so as to adjust the confidence interval, according to the fluctuations of the temperature T.
    According to a feature of the invention, this adjustment step is performed by the microcontroller. The temperature sensor 40 is fixed, so as to measure in real time the ambient temperature called working temperature. In the case where the tool has an evaporator, the temperature sensor 40 can be fixed on the evaporator, if heat transfer takes place between the combustion chamber and the evaporator.
    Such an adjustment advantageously makes it possible to take into account the temperature conditions to cause an optimal combustion according to the physicochemical properties of the gas used. For example, the value of the first threshold is set at 0.40 seconds and the value of the second threshold is set at 0.150 seconds using butene / propene or a mixture of alkenes as fuel gas, for a use temperature between -10 ° C and 50 ° C. Since the effective filling time At of the combustion chamber is within the confidence interval (first condition) and the ignition medium generator supplies at the terminals of the capacitor a voltage greater than the threshold voltage of trigger Vd (second condition), the triggering of ignition is controlled by the microcontroller.
    Thus, when the two above conditions are met after a step of Boolean logic E13 (ET), the microcontroller provides, during a sending step Ei5, a trigger control signal S to the device controlled tripping 27 'to cause ignition of the combustion chamber.
    Advantageously, the firing is triggered only if the effective filling time of the combustion chamber is within the confidence interval corresponding to an optimal filling of the combustion chamber by the fuel gas and if the voltage at the terminals capacitor exceeds the trip voltage threshold. In this way, it is ensured that, upon activation of the trigger by the user, the combustion chamber is sufficiently filled to generate a power necessary to ensure a good quality of fire.
    The controlled tripping device 27 'is a conventional device based on electronic components initiated by the voltage at its terminals (V> Vd). Π is distinguished from the triggering device of the prior art 27 in that it is designed to be controlled by the microcontroller so as to activate the high voltage generator on receipt of the trigger control signal S.
    According to the embodiment described above, the first and second conditions must be met to enable the generation and sending of the firing trigger S. However, in other embodiments, only the first condition must be met in order to trigger the shot.
    According to an alternative embodiment, if the first or the second condition, or if the first and second conditions are not met when the user presses the trigger 10 to trigger the shot, the step of generating and sending E15 of the command S is deferred pending the fulfillment of all the predicted conditions.
    For example, assuming that the user chains too quickly the first and second mechanical events, respectively corresponding to the support of the tool on the work area and the support on the trigger, so that the combustion chamber n has not had time to fill optimally (see Fig. 5 "sequence B"), pressing the trigger does not instantly cause the combustion chamber to close, so that it remains open still for an additional time to complete the filling of the chamber. This additional duration At - AtR {i, 2} corresponding to the difference between the actual filling time At = t2-t | the first threshold AtR1 and. (or the second threshold AtR2 or any other value between the first and second thresholds).
    The steps of the method according to the invention, including the detection steps Ei, E2, of measurement E3 and comparison In time, of generation E15 of a control, of voltage conversion E4, of measurement E3 and of comparison E5 of voltage Adjustment methods described above are implemented by means of the microcontroller 30. Those skilled in the art will understand that means equivalent to the microcontroller may be employed for the implementation of these steps without departing from the scope of the present invention. . The invention will now be described with reference to the timing diagram of FIG. 5a, from which further advantages will flow. This timing diagram illustrates the sequencing of different events and / or phases involved in the use of the tool incorporating the control device according to the invention: SI: mechanical support of the tool on the work surface; 52: activation of the second switch 22; 53: activation of the first switch 21; 54: ignition preparation comprising generating a medium ignition voltage; and 55: generation of the spark by the spark plug 29. The active state and the inactive state of the phases S1-S5 are designated respectively by ON and OFF in FIG. 5. The bearing of the tool on the zone working at the first moment L marks the beginning of the tool preparation phase, during which the combustion chamber fills with combustible gas. At this same first time tl5 the second switch is activated causing the start of the generation of the medium ignition voltage by the generator of medium ignition voltage and the start of the charge of the capacitor. After a filling time greater than the first threshold At R, from the first moment ti, the combustion chamber is sufficiently filled with gas to allow quality shooting. At the moment ti + ATRÎ, the tool is ready to allow shooting in optimal conditions. As an illustration, it is considered that the preparation time of the tool at the end of which the combustion chamber is optimally filled corresponds to the minimum filling time AtRi. However, this preparation time may be set to any other value between the first and second thresholds.
    When the user presses the trigger 10 at the second instant Î2, the microcontroller 30 measures a time interval At = t2-ti greater than the preparation time of the tool corresponding to the first threshold AtRi (first condition fulfilled). At the same second instant t2, it is assumed that the capacitor 26 has had sufficient time to load. In this case, the voltage measured by the microcontroller is greater than the trigger threshold voltage Vd (second condition fulfilled). Thus, the generation of the medium ignition voltage is completed when the user presses the trigger 10. The first and second conditions being fulfilled, the firing is authorized: the microcontroller 30 sends the trigger command S to the controlled triggering device 27 'which induces the generation of the high voltage signal and the spark (case of the sequence A).
    In the case where the microcontroller measures a time interval At '= t2'-ti' between the first moment ti 'where the tool is placed in support and the second t2' where the user presses the trigger less than the duration minimum preparation of the tool (AtRi first threshold), the preparation of the tool is interrupted before reaching a minimum filling of the chamber by the gas (case of the sequence B). In this case, the firing is not allowed by the microcontroller 30 which sends no trigger command to the controlled tripping device 27 '. Figure 6 is a schematic block diagram of a combustion chamber ignition control device for a gas fastener. This control device comprises inputs / outputs for interfacing with: the first switch 21 controlled by the mechanical support of the tool on a working surface and receiving the signal V2i for detecting the mechanical support of the tool at the first moment tj, the second switch 22 controlled by the actuation of the trigger 10 of the tool by the user and receive the signal V22 for detecting the support on the trigger 10 at the second instant t2, the temperature sensor 40 intended to provide a working ambient temperature parameter T, the charging capacitor 26, and the ignition triggering device 27 '.
    This device further comprises a temporal measurement and comparison device 34 comprising: measurement means 34.1 for measuring the time interval Δt between the first instant ti and the second instant t2, the first and second instants being recorded by said first instant ti and the second instant t2; measuring means respectively when receiving the signal V21 for detecting the mechanical support of the tool and when receiving the signal V22 for detecting the support on the trigger 10, - comparison means 34.2 for comparing the time interval Δί measured with respect to the first threshold AtRi and the second threshold AtR2 and providing a comparison signal S34 if the measured time interval Δί is between the first and second thresholds, - adjustment means 34.4 for adjust the values of the first AtRJ and second AtR2 thresholds, - storage means 34.3 for storing configuration information such as the first AtRi values and two th AtR2 thresholds, rules for adjusting these values according to at least one ambient working temperature parameter.
    This device further comprises a voltage measurement and comparison device 32 comprising: conversion means 32.1 for converting the average ignition voltage signal V2 into a signal V'2 of amplitude comparable to the threshold voltage of tripping Vd, comparison means 32.2 for comparing the converted signal V'2 with respect to the trigger threshold voltage Vd, and storage means 32.3 for storing configuration parameters such as the value of the threshold voltage trigger Vd.
    This device further comprises a decision element 35 connected to the voltage comparison means 32.2 and to the temporal comparison means 34.2, the decision member being adapted to generate the control signal S intended for the controlled trigger 27 'on receipt of the a signal emitted by the two measuring and comparison elements 32 and 34 indicating that both conditions are fulfilled.
    According to another feature of the invention, the electronic ignition control device according to the invention is designed to be arranged in a single removable block to implement the steps of the method according to the invention. Such an arrangement allows maintenance and easy replacement of the block during repair or maintenance operations.
    According to a preferred embodiment of the invention, the measuring and comparison members 32 and 34 and the decision member 35 are implemented by a microcontroller. However, the latter may be replaced by any other device designed to perform the functions described above.
    According to a second embodiment as illustrated schematically in FIG. 7, the delay means are implemented by means of a delay module 34 'controlling a delay switch 23, connected in series between a d switch 'support 22' controlled by the support of the tool and secondly a trigger switch 21 'controlled by the support of the trigger 10.
    The means for generating a control signal for triggering ignition of the combustion chamber are constituted by the delay means, the support switch, the trigger switch, the delay switch, and the voltage source 20.
    The first detection means for detecting the pressing of the tool against a working surface at the first instant ti (first mechanical event) are formed by the support switch 22 'connected to the voltage source 20.
    The second detection means for detecting the support on the trigger 10 are formed by the trigger switch 21 'connected in series with the support switch.
    The delay module 34 'is adapted to trigger the flow of a delay time AtR, on reception of a detection signal V'22 supplied by the voltage source 20. This detection signal is provided when the 'Support switch 22' is closed when the tool is placed on the work surface at the first moment ti (first mechanical event).
    The delay time Δΐκ is predefined in the delay module 34 '. Advantageously, the value of the delay time is set in a confidence interval between the first AtR1 and second AtR2 thresholds respectively corresponding to first and second timing values, so that Δΐκ, <Δΐκ <ΔΐΚ2 to ensure optimal shooting conditions as described above.
    According to a particular feature of the invention, the value of the delay time AtR can be adjusted in real time, as a function of at least one temperature parameter T, such as the ambient temperature known as the working temperature, this parameter being delivered as described above by the sensor 40 to further improve shooting conditions. The invention will now be described with reference to FIG. 8 which illustrates a series of events occurring during the use of the tool equipped with an ignition control device according to the second embodiment. For a switch, the state "ON" indicates that it is closed (activated), while the state "OFF" indicates that it is open.
    According to one particularity of the invention, the triggering control of the firing of the tool can not be generated until the delay time AtR has been completely elapsed by the delay module 34 ', starting from the closing of the support switch 22 'at the first instant ti.
    After the expiry of the delay time, at time ti + AtR, the filling of the combustion chamber with the fuel gas is optimal. At this time, the delay module 34 'causes the closing of the delay switch 23, so that the electrical signal from the voltage source 20 is transmitted at the output of the timer switch 23. the trigger 10 of the tool causes the closing of the trigger switch 21 '.
    If the trigger is depressed before the expiration of the delay time, at a time t'2 <tj + AtR the trigger switch 21 'closes while the timer switch 23' remains open. In this case, the voltage signal at the output of the biasing switch 22 'can not be transmitted to the trigger switch. Thus, the firing trigger command can not be generated, as long as the timer module 34 'does not close the timer switch 23.
    If the pressure on the trigger comes after the expiry of the delay time, at a time t2> ti + AtR, the support switch 22 ', the timer switch 23 and the trigger switch 21' are all closed ("ON" state), so that the electrical signal from voltage source 20 is supplied at the output of the trigger switch 21 '. The firing trigger command can then be generated.
    In this case, it will be noted that the triggering of the firing does not take place directly as soon as the delay time expires at the instant tj + AtR but after a lapse of time W from the instant ti + AtR at the moment of pressing the trigger at time t2.
    According to one particularity of the invention, it will be possible to prevent the triggering of the firing if this lapse of time W exceeds a certain threshold value, beyond which the firing conditions of the combustion chamber are no longer optimal to guarantee a firing. quality.
    In this case, the delay module 34 'is adapted to trigger another timer from the instant (ti + AtR) where it has caused the closing of the delay switch, to ensure that the shot is not more possible after a duration Wmax, such that t2-ti = Wmax + AtR <AtR2.
    According to one particularity of the invention, the delay switch 23 goes from the closed state ON to the open state OFF after a duration Z, to allow a next shot. The changeover from the closed state to the open state of the delay switch 23 can be controlled by the delay module 34 ', or by a new press on the trigger 10 of the tool, following the sending of a shot trigger command.
    As previously described with reference to FIGS. 3-6, the trip command for the controlled trip device 27 'can be generated with the additional condition that the average ignition voltage is greater than the reference trigger voltage Vd. this condition being effected by means of the voltage comparator 32 or any other equivalent device.
    权利要求:
    Claims (18)
    [1" id="c-fr-0001]
    claims
    1. A method for controlling electronic ignition of an internal combustion chamber (3) of a gas fixation tool, characterized in that it comprises the following steps: • detection (Ei) of a first mechanical event to a first moment (tj); Detecting (E7) a second mechanical event at a second instant (t2); Generating a control signal (S) for triggering ignition of the combustion chamber following the detection of the second mechanical event, if the duration (ΔΙ) between the first and second mechanical events is greater than a first threshold predetermined (AtR]).
    [2" id="c-fr-0002]
    2. Method according to claim 1, characterized in that the step of generating said control signal (S) comprises the following sub-steps: time measurement (E3) for measuring the elapsed time (Δί) between said first instant ( ti) and said second instant (t2); • time comparison (En) for comparing said elapsed time (Δί) and said first predetermined threshold (Δΐκ,); and • generating said signal if said elapsed time is greater than the first threshold (AtRi).
    [3" id="c-fr-0003]
    3. Method according to claim 1, characterized in that the step of generating said control signal (S) comprises the following substeps: triggering a delay of a duration equal to said threshold during the detection of the first mechanical event; and • generating said control signal if the detection of the second event occurs after the end of the delay.
    [4" id="c-fr-0004]
    4. Method according to any one of claims 1 to 3, characterized in that the generating step (Ei5) of the ignition triggering control (S) is performed only with the additional condition that the duration ( Δί) between the first and second mechanical events is less than a second predetermined threshold (At).
    [5" id="c-fr-0005]
    5. Method according to any one of claims 1 to 4, characterized in that it further comprises an adjustment step for adjusting at least one of the thresholds (AtRi.AtR2) as a function of at least one temperature parameter. (T).
    [6" id="c-fr-0006]
    6. Method according to any one of claims 1 to 5, characterized in that it further comprises: a generation step (E2) of a medium ignition voltage (V2) initiated when the first event mechanical is detected at the first moment (ti); A voltage comparing step (E5) for comparing said average ignition voltage with respect to a reference trigger voltage (Vd), and in that said triggering command (S) is generated with the additional condition that the medium ignition voltage (V2) has an amplitude greater than the reference trigger voltage (Vd).
    [7" id="c-fr-0007]
    7. Method according to claim 6, characterized in that it further comprises, between said step of generating a medium ignition voltage (E2) and said voltage comparison step (E5), a conversion step (E4). the average ignition voltage (V2).
    [8" id="c-fr-0008]
    8. An electronic ignition control device of an internal combustion chamber of a gas fixation tool, characterized in that it comprises: first detection means (30, 22, V22) for detecting a first event mechanical at a first instant (ti); Second detection means (30, 21, V21) for detecting a second mechanical event at a second instant (t2); Means for generating a control signal (S) for triggering ignition of the combustion chamber following the detection of the second mechanical event, if the duration (At) between the first and second mechanical events is greater than a first predetermined threshold (AtR1).
    [9" id="c-fr-0009]
    9. Device according to claim 8, characterized in that the means for generating said control signal (S) comprise: time measuring means (34.1) adapted to measure the elapsed time (At) between said first instant (ti) and said second instant (t2); Time comparison means (34.2) for comparing said elapsed time (At) and said first predetermined threshold (AtRi); and control generating means (35) for generating said control signal if said elapsed time (At) is greater than said first threshold (AtR1).
    [10" id="c-fr-0010]
    10. Device according to claim 10, characterized in that: • said first detection means comprise an expansion switch (21) controlled the second mechanical event; Said second detection means comprise a support switch (22) controlled by the first mechanical event, the trigger switch and the support switch being connected to said temporal measuring means (34.1).
    [11" id="c-fr-0011]
    11. Device according to claim 8, characterized in that • the means for generating said control signal (S) comprise timing means of a duration equal to said first threshold, said timing means being adapted to trigger said timer during the detection of the first mechanical event; and in that • said generation means are adapted to generate said control signal at the end of the time delay.
    [12" id="c-fr-0012]
    12. Device according to claim 11, characterized in that: • said first detection means comprise an expansion switch (21 ') controlled by the second mechanical event; Said second detection means comprise a support switch (22 ') controlled by the first mechanical event, the delay means comprise a delay module (34') coupled to a delay switch (23) connected in series between the expansion switch (2Γ) and the support switch (23 ').
    [13" id="c-fr-0013]
    13. Device according to any one of claims 8 to 12, characterized in that said means for generating the control signal are adapted to generate said control signal with the additional condition that the duration (Δί) between the first and second events mechanical values is less than a second predetermined threshold (Δί ^).
    [14" id="c-fr-0014]
    14. Device according to any one of claims 8 to 13, characterized in that it further comprises: adjustment means (34.4) for adjusting at least one of said thresholds (AtRi, AtR2) as a function of at least a temperature parameter (T).
    [15" id="c-fr-0015]
    15. Device according to any one of claims 8 to 14, characterized in that it further comprises: means for generating a medium ignition voltage (V2) adapted to generate said medium voltage, provided that the first mechanical event is detected at the first instant (ti); Voltage comparing means (32.2) for comparing the average ignition voltage (V2) with respect to a reference trigger voltage (Vd), and that the generating means (35) for tripping are adapted to generate said command (S), if the amplitude of the average ignition voltage signal (V2) is greater than the reference trigger voltage (Vd).
    [16" id="c-fr-0016]
    16. Device according to claim 15, characterized in that it further comprises voltage conversion means (32.1) for converting said average ignition voltage (V2) into a voltage (V'2) comparable to the voltage of reference trigger (Vd).
    [17" id="c-fr-0017]
    17. Device according to any one of claims 8 to 16, characterized in that it is arranged in a removable block.
    [18" id="c-fr-0018]
    18. Gas fixation tool, characterized in that it comprises an electronic ignition control device according to any one of claims 8 to 17.
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    同族专利:
    公开号 | 公开日
    AU2016269547A1|2017-07-06|
    CA2950292C|2019-03-05|
    CA2950292A1|2017-06-18|
    NZ727364A|2018-06-29|
    US10456897B2|2019-10-29|
    US20170173771A1|2017-06-22|
    AU2016269547B2|2018-07-12|
    EP3181304B1|2018-08-22|
    EP3181304A1|2017-06-21|
    FR3045784B1|2019-03-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1391270A1|2002-08-09|2004-02-25|Hitachi Koki Co., Ltd.|Combustion-powered nail gun|
    EP1782925A1|2005-11-04|2007-05-09|HILTI Aktiengesellschaft|Combustion-driven fastener setting tool|
    EP1878540A1|2006-07-14|2008-01-16|Makita Corporation|Combustion power tool|
    WO2008048294A1|2006-10-16|2008-04-24|Illinois Tool Works Inc.|Recharge cycle function for combustion nailer|
    US20080223895A1|2007-03-15|2008-09-18|Hitachi Koki Co., Ltd.|Combustion-powered tool with improved ignition starting feature|
    US20100243699A1|2009-03-31|2010-09-30|Marc Largo|Single switched dual firing condition combustion nailer|
    US5133329A|1991-11-25|1992-07-28|Illinois Tool Works Inc.|Ignition system for combustion-powered tool|
    US6123241A|1995-05-23|2000-09-26|Applied Tool Development Corporation|Internal combustion powered tool|
    DE10222338A1|2002-05-21|2003-12-04|Hilti Ag|Combustion-powered setting tool|
    US6722550B1|2003-05-09|2004-04-20|Illinois Tool Works Inc.|Fuel level indicator for combustion tools|NZ752981A|2016-12-22|2020-07-31|Kyocera Senco Ind Tools Inc|Fastener driving tool with driver position sensors|
    GB2567230B|2017-10-09|2020-03-04|Thermo Fisher Scient Bremen Gmbh|Detector protection in an optical emission spectrometer|
    US11179837B2|2017-12-01|2021-11-23|Illinois Tool Works Inc.|Fastener-driving tool with multiple combustion chambers and usable with fuel canisters of varying lengths|
    US11065749B2|2018-03-26|2021-07-20|TtiLimited|Powered fastener driver|
    CN110440438A|2018-05-03|2019-11-12|创科（澳门离岸商业服务）有限公司|Air heater|
    法律状态:
    2016-12-27| PLFP| Fee payment|Year of fee payment: 2 |
    2017-06-23| PLSC| Publication of the preliminary search report|Effective date: 20170623 |
    2017-12-27| PLFP| Fee payment|Year of fee payment: 3 |
    2018-12-26| PLFP| Fee payment|Year of fee payment: 4 |
    2019-12-26| PLFP| Fee payment|Year of fee payment: 5 |
    2020-12-27| PLFP| Fee payment|Year of fee payment: 6 |
    2021-12-27| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1562728A|FR3045784B1|2015-12-18|2015-12-18|METHOD FOR CONTROLLING THE ACTUATION OF A GAS FASTENING TOOL AND CORRESPONDING DEVICE|
    FR1562728|2015-12-18|FR1562728A| FR3045784B1|2015-12-18|2015-12-18|METHOD FOR CONTROLLING THE ACTUATION OF A GAS FASTENING TOOL AND CORRESPONDING DEVICE|
    EP16199987.5A| EP3181304B1|2015-12-18|2016-11-22|Method for controlling the actuation of a gas-fixing tool and corresponding device|
    CA2950292A| CA2950292C|2015-12-18|2016-12-01|Method for controlling the actuation of a gas-powered fixing tool and the corresponding device|
    AU2016269547A| AU2016269547B2|2015-12-18|2016-12-09|Electronic circuit preventing firing|
    NZ727364A| NZ727364A|2015-12-18|2016-12-12|Method for controlling the actuation of a gas-powered fixing tool and the corresponding device|
    US15/378,840| US10456897B2|2015-12-18|2016-12-14|Method for controlling the actuation of a gas-powered fixing tool and the corresponding device|
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