JP4973117B2 - Paper punching device and control method thereof - Google Patents

Description

  The present invention relates to a paper punching device suitable for being applied to a device for punching a recording paper output from a copying machine or a printing device, and a control method therefor.

  Specifically, it is equipped with a control means that executes control for punching two or more holes at one end of the paper with a reciprocating punch blade, and detects whether the punch blade has entered the home position during punch blade stop control. The reverse rotation braking of the punch blade driving motor is executed until a predetermined time elapses from the time when the punch blade enters the home position, and when the punch blade reaches a predetermined position within the predetermined time, based on time monitoring In this way, the reverse braking of the motor is extended so that the punch blade can be stopped in the home position, and it is possible to cope with environmental changes and brake performance changes such as when the paper is thin or thick. The punch blade is controlled to stop at the home position.

  In recent years, there are many cases where a punching device is used in combination with a black-and-white and color copier or printing device. According to this type of punching apparatus, the recording paper after image formation is received and punched on the downstream side of the paper using the punch function. The punched sheets are aligned again, and a binding process such as a ring band is automatically performed using the holes.

  The punching device is provided with a punch processing section, and a DC (direct current) motor is used for the punch processing section, and the rotary motion is converted into a reciprocating motion to make a one-stroke operation of the punch blade. In order to always stop the punch blade at a fixed position (home position) within a short time operation, after the motor is turned on and the punch blade reaches the lowest point, the braking force is adjusted by short brake control.

  For example, in relation to this type of punching device, Patent Document 1 discloses a paper punching device, a paper processing device, and an image forming system. According to this paper punching device, when a brushless motor is used as a punch motor, forward or reverse control of the motor is controlled based on the rotation direction flag, and a pulse count for measuring the elapsed time immediately after the rotation of the motor is obtained. Start. After a predetermined time elapses, a brake start pulse is calculated, and motor brake control is executed when the pulse count value becomes the brake start pulse. If such a motor control method is adopted, even if a brushless motor is used as the punch motor, the motor stop accuracy can be improved.

  Patent Document 2 discloses a paper punching device, a paper processing device, and an image forming system. According to this paper punching device, the driving amount of the motor that performs the punching operation is detected, the thickness of the paper to be punched is detected, and the stop operation of the motor that performs the punching operation is controlled according to the paper thickness. Made. By adopting such a motor control method, the motor stop accuracy can be improved even when the thickness changes.

  Further, Patent Document 3 discloses a paper punching device, a paper processing device, and an image forming system. According to this paper punching device, when punching paper with a punch blade, the position of the punch blade is detected when the motor is stopped or before the motor is stopped, and the position is compared with the desired position. When the punch blade is out of position, the motor is controlled again. If such a motor control method is adopted, even if a brushless motor is used as the punch motor, the motor stop accuracy can be improved.

JP 2004-345834 A (3rd page FIG. 17) Japanese Patent Laying-Open No. 2005-014160 (page 3 in FIG. 16) Japanese Patent Laying-Open No. 2005-075550 (FIG. 18 on page 5)

  By the way, according to the conventional high-speed punch blade unit, as seen in Patent Documents 1 to 3, a DC motor is used, and when this DC motor is operated, one punch operation is completed within a short time. To be made.

  However, it is not sufficient to simply change the start timing of the brake, to control the stop operation according to the thickness of the paper, to determine the front and rear of the desired motor stop position, and to redrive or reversely drive the DC motor. The punch blade unit does not stop at the home position due to the mechanical time constant (delay coefficient: ξ), and stops at a position outside the home position.

  Further, if the punching operation is continued for a long time, the motor becomes high temperature. As a result, the braking force during braking is reduced. In other words, the brake is not good. Therefore, when the control method for applying the reverse brake for the calculated time is adopted, there is a possibility that the motor does not stop within the allowable range for stopping the home and the motor rotates too much to cause the punch blade to be homed out.

  In particular, it is very difficult to stop a punch blade with a high-speed operation specification with high reproducibility within a home position where the home stop allowable range is narrow. Incidentally, if the brake is applied too quickly, the punch blade stops before the home position, and if the brake is slow, the punch blade may pass the home position.

  Therefore, the present invention solves the above-described problem, and enables the punch blade to be stopped within a predetermined home position with good reproducibility when the punch blade is stopped. An object of the present invention is to provide a paper punching device and a control method therefor, which can reciprocate a punch blade with respect to a predetermined home position even when the thickness is thick.

In order to solve the above problems, a paper punching device according to the present invention is a paper punching device for punching holes in a predetermined paper, and includes a punch blade driving motor for driving a reciprocable punch blade. A punching means for punching two or more holes at one end of the paper, and a control means for controlling the punching means, and applying a voltage having a polarity opposite to that during forward rotation between the motor terminals. The operation of braking the motor is reverse braking, the operation of disconnecting the motor from the power supply and short-circuiting between the terminals to brake the motor is short-circuit braking, the unit monitoring time is set in the timer, and the motor reverse braking in the unit monitoring time When the operation for measuring the speed of the punch blade based on the above is timed monitoring, the control means performs the first short-circuit braking on the motor at a predetermined position before the home position where the stop position of the punch blade is allowed. Run Detects whether the punching blade has entered the home position stop position of the punch blades is allowed, a predetermined time from the time when the punching blade has entered the home position, based on the time monitoring and executes a plugging the motor measuring the speed of the punching blade, if the punching blade in the velocity measurement of the punch blades based on the time monitoring has reached a predetermined position within a predetermined time, to extend the plugging based on the time monitoring, the plugging After the extension, when the speed measurement of the punch blade becomes impossible, the reverse braking of the motor is finished, and then the second short-circuit braking is executed for the motor to stop the punch blade at the home position. It is a feature.

According to the paper punching device of the present invention, when punching holes in a predetermined paper, if the control means controls the punching means, the punching means drives when punching two or more holes in one end of the paper. The motor is driven to reciprocate the punch blade. Based on this assumption, the control means executes the first short-circuit braking for the motor at a predetermined position before the home position where the punch blade stop position is allowed , and the punch blade stop position is allowed. that the home position detecting whether the punch blade has entered a predetermined time from the time when the punching blade has entered the home position, to measure the speed of the punching blade based on the time monitoring and executes a reverse braking for the motor. The control means extends the reverse braking based on the time monitoring when the punch blade reaches a predetermined position within a predetermined time in the speed measurement of the punch blade based on the time monitoring, and after extending the reverse braking, when the speed measurement of the blade becomes impossible, ends the plugging of the motor, then performs a second short brake with respect to the motor, so to stop the punching blade to the home position. Therefore, since the speed for bringing the punch blade to the stop can be quickly converged to zero, the punch blade can be stopped within the home position with good reproducibility.

A control method for a paper punching device according to the present invention is a control method for a paper punching device in which a punch blade driving motor is driven to reciprocate when punching two or more holes in one end of a paper. The operation to brake the motor by applying a voltage of the opposite polarity to that during forward rotation between the motor terminals is reverse braking, and the operation to brake the motor by disconnecting the motor from the power supply and shorting between the terminals When braking, set the unit monitoring time in the timer, and measure the punch blade speed based on the reverse rotation braking of the motor during the unit monitoring time, and the timed monitoring, the punch blade stop position is allowed from the permitted home position detecting and executing a first short brake to the motor even at the previous position, whether the punch blade has entered the home position stop position of the punch blades is permitted , Measuring the speed of the punching blade from the time when the detected punch blade has entered the home position a predetermined time, based on the time monitoring and executes a plugging the motor, the speed of the punching blade that is based on the time monitoring In the measurement, when the punch blade reaches a predetermined position within a predetermined time, the step of extending the reverse braking based on the time monitoring, and the time when the speed measurement of the punch blade becomes impossible after the extension of the reverse braking in, terminates the plugging of the motor, then, are those which perform the second short brake with respect to the motor, characterized by a step of Ru to stop the punching blade to the home position.

  According to the control method of the paper punching apparatus according to the present invention, when punching a hole in a predetermined paper, the speed for bringing the punch blade to a stop can be quickly converged to zero, so that the punch blade is reproduced in the home position. You can stop well. Therefore, the punch blade can be controlled to stop at a home position with good reproducibility even when the thickness of the sheet is small or when the environment is changed or the brake performance is changed.

  According to the paper punching device and the control method thereof according to the present invention, the paper punching device and the control method thereof include a control unit that performs control for punching two or more holes in one end of the paper with a reciprocating punch blade, It is detected whether the punch blade has entered, the reverse rotation braking of the motor for driving the punch blade is executed for a predetermined time from the time when the punch blade enters the home position, and after the predetermined time has passed, The reverse braking of the motor is extended.

  With this configuration, the speed at which the punch blade is brought to a stop can be quickly converged to zero, so that the punch blade can be stopped at a predetermined stop position set in the home position with high reproducibility. Therefore, it is possible to realize the reciprocating operation of the punch blade with respect to the home position, regardless of whether the paper is thin or thick. As a result, a highly accurate and highly reliable paper punching device can be provided.

  Hereinafter, a paper punching device and a control method thereof according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a conceptual diagram showing a configuration example of a binding device 100 to which a paper punching device as an embodiment according to the present invention is applied.

  The binding device 100 shown in FIG. 1 is an application of a paper punching device, punches recording paper (hereinafter simply referred to as paper 3) output from a copier or printing device, and then a predetermined binding component (consumable). Product) 43 is a device for binding and discharging. Of course, the present invention may be applied to a paper punching device having a function of punching holes in a predetermined paper 3 and discharging the paper as it is. In the case of the punched paper, it may be supplied to the binding device (bind processing unit) without passing through the punching process.

  The binding device 100 has a device main body (housing) 101. The binding apparatus 100 is preferably used side by side with a copying machine, a printing machine (image forming apparatus), and the like, and the apparatus main body 101 has a height comparable to that of a copying machine, a printing machine, or the like.

  In the apparatus main body 101, a paper transport unit 10 is provided. The paper transport unit 10 includes a first transport path 11 and a second transport path 12. The transport path 11 has a paper feed port 13 and a discharge port 14, and has a through-pass function for transporting the paper 3 drawn from the paper feed port 13 toward the discharge port 14 at a predetermined position.

  Here, the through-pass function means that the conveyance path 11 positioned between the upstream copying machine or printing machine and the downstream downstream sheet processing apparatus transfers the sheet 3 from the copying machine or printing machine to another sheet processing apparatus. A function that directly transfers When this through-pass function is selected, the conveyance roller acceleration processing, binding processing, and the like are omitted. The sheet 3 is usually sent face down in the case of single-sided copying. A paper feed sensor 111 is attached to the paper feed port 13 to detect the leading edge of the paper 3 and output a paper feed detection signal S11 to the control unit 50.

  The transport path 12 has a switchback function that can switch the transport path from the transport path 11. Here, the switchback function decelerates and stops the conveyance of the sheet 3 at a predetermined position in the conveyance path 11, and then switches the conveyance path of the sheet 3 from the conveyance path 11 to the conveyance path 12, and The function to send in the reverse direction. The conveyance path 11 is provided with a flap 15 so that the conveyance path is switched from the conveyance path 11 to the conveyance path 12.

  Three transfer rollers 17c, 19a 'and 19a are provided at a switching point between the transfer path 11 and the transfer path 12. The transport rollers 17c and 19a rotate clockwise, and the transport roller 19a 'rotates counterclockwise. For example, the transport roller 19a 'is a driving roller and the transport rollers 17c and 19a are driven rollers. The sheet 3 taken in by the conveying rollers 17c and 19a 'decelerates and stops. However, when the flap 15 is switched from the upper side to the lower side, the sheet 3 is fed by the conveying rollers 19a' and 19a and conveyed to the conveying path 12. A paper detection sensor 114 is disposed in front of the three conveyance rollers 17c, 19a ', 19a, and detects the front and rear edges of the paper and outputs a paper detection signal S14 to the control unit 50.

  On the downstream side of the conveyance path 12, a punch processing unit 20 as an example of a punching unit is disposed. In this example, the conveyance path 11 and the conveyance path 12 are designed to have a predetermined angle. For example, a first depression angle θ <b> 1 is set between the conveyance surface of the conveyance path 11 and the sheet punching surface of the punch processing unit 20. Here, the paper perforated surface is a surface for perforating the paper 3. The punch processing unit 20 is disposed so as to set the sheet perforated surface at a position having a depression angle θ1 with respect to the transport surface of the transport path 11.

  The punch processing unit 20 switches back from the conveyance path 11 and punches two or more binding holes at one end of the sheet 3 conveyed by the conveyance path 12. The punch processing unit 20 includes, for example, a motor 22 that drives a punch blade 21 that can reciprocate. The sheets 3 are punched one by one by a punch blade 21 driven by a motor 22. A DC motor is used as the motor 22. Table 1 shows the operation modes of the motor 22.

  In Table 1, the “forward rotation” mode refers to an operation (ON (CW)) in which a voltage of a predetermined polarity is applied between the terminals of the motor 22 to cause the motor 22 to rotate forward. The “reverse rotation” mode refers to an operation (ON (CCW)) that reversely rotates the motor 22 by applying a reverse polarity voltage between the terminals of the motor 22. The “short brake” mode is an operation in which the motor 22 is disconnected from the power source, the terminals are short-circuited (short-circuited), the motor 22 functions as a generator, and braking is performed using the armature reaction (short-circuit braking). . The “free run” mode refers to an operation in which the motor 22 is disconnected from the power source, the terminals are opened, and the motor 22 rotates according to the load torque.

  An openable / closable fence 24 serving as a reference for the punching position is provided in the punch processing unit 20, and is used to apply the paper 3. Further, the punch processing unit 20 is provided with a side jogger 23 to correct the posture of the paper 3. For example, the front end of the sheet 3 is in contact with the openable / closable fence 24 evenly. The fence 24 serves as a position reference when aligning the sheet edge. A paper detection sensor 118 is disposed in front of the side jogger 23 to detect the front and rear ends of the paper 3 and output a paper detection signal S18 to the control unit 50.

  The punch processing unit 20 stops the sheet 3 by bringing it into contact with the fence 24, and then punches the leading end of the sheet 3. A punch residue storage 26 is provided below the punch processing body so as to store punch scraps cut off by the punch blade 21. A paper discharge roller 25 as an example of a paper discharge unit is provided on the downstream side of the punch processing unit 20 so as to convey the paper 3 'after punching the paper to the next stage unit.

  A binder paper alignment unit 30 is disposed downstream of the punch processing unit 20 so that the positions of the holes of the plurality of sheets 3 ′ discharged from the punch processing unit 20 are aligned and temporarily held (accumulated). The The binder paper alignment unit 30 is disposed so as to set the paper holding surface at a position having the second depression angle θ2 with respect to the conveyance surface of the conveyance unit 11. Here, the sheet holding surface refers to a surface that holds (stacks) the sheets 3 ′ with holes. In this example, the relationship between the depression angle θ1 and the depression angle θ2 is set to θ1 <θ2. The depression angle θ1 is set to 0 ° <θ1 <45 °, and the depression angle θ2 is set to 0 ° <θ2 <90 °. This setting is for reducing the width of the main apparatus 101 and for conveying the sheet 3 'linearly under this condition.

  The binder paper aligning unit 30 has a paper guide press function, and guides the paper 3 to a predetermined position when the paper enters, and presses the rear end of the paper 3 'after the paper entrance is completed. The binder paper aligning unit 30 also has a paper front end aligning function, and when the paper enters, a multi-fold rotating member (hereinafter referred to as a paddle roller 32) for aligning the front end and the lateral end of the paper 3 'to the reference position. The leading end of the sheet 3 'is guided to an appropriate position.

  A bind processing unit 40 is arranged on the downstream side of the binder sheet aligning unit 30, and a booklet 90 is created by binding a plurality of sheet bundles 3 ″ aligned by the unit 30 with a binding component 43. The booklet 90 is a sheet bundle 3 ″ in which the binding component 43 is fitted and bound.

  In this example, the bind processing unit 40 has a moving mechanism 41. The moving mechanism 41 passes so as to reciprocate between the paper conveyance direction of the binder paper alignment unit 30 and the position perpendicular to the conveyance direction of the paper conveyance unit 10 described above. The binding processing unit 40 includes a binder (binding component) cassette 42. A plurality of binding parts are set in the binder cassette 42. For example, the binding component is formed by injection molding, and a plurality of types are prepared according to the thickness of the sheet bundle 3 ″.

  For example, the moving mechanism 41 pulls out and holds one binding component 43 from the binder cassette 42 at a position orthogonal to the conveyance direction of the paper conveyance unit 10, and in this state, can see the paper conveyance direction of the binder paper alignment unit 30. Rotate to position. At this position, the bind processing unit 40 receives the sheet bundle 3 ″ in which the punch holes are positioned from the binder paper aligning unit 30 and fits the binding component 43 into the punch holes to execute the binding process (automatic bookbinding). function).

  A discharge unit 60 is disposed on the downstream side of the bind processing unit 40, and the booklet 90 created by the bind processing unit 40 is discharged. The discharge unit 60 includes, for example, a first belt unit 61, a second belt unit 62, and a stacker 63.

  The belt unit 61 receives the booklet 90 falling from the binder paper alignment unit 30 and switches the sending direction. For example, the belt unit main body is turned in a predetermined discharge direction from a position where the binder paper alignment unit 30 can see the paper conveyance direction.

  The belt unit 62 receives the booklet 90 whose sending direction is switched by the belt unit 61 and relays it. The stacker 63 constitutes an example of a booklet accumulating unit, and stores the booklet 90 conveyed by the belt units 61 and 62. In this way, the binding device 100 to which the paper punching device is applied is configured.

  Next, a paper processing method according to the present invention will be described. 2A to 2D are process diagrams illustrating an example of functions of the binding device 100.

  The sheet 3 shown in FIG. 2A is fed from the upstream side of the binding device 100. The punch hole is not opened. The sheet 3 ′ is transported toward a predetermined position on the transport path 11 illustrated in FIG. 1, and is decelerated and stopped at a predetermined position on the transport path 11. Thereafter, the conveyance path of the sheet 3 ′ is switched from the conveyance path 11 to the conveyance path 12, and the sheet 3 is sent in the reverse direction and conveyed to the punch processing unit 20.

  In the punch processing unit 20, a predetermined number of binding holes are formed at one end of the paper 3 as shown in FIG. 2B. The sheet 3 ′ on which the binding hole is formed is conveyed to the binder sheet aligning unit 30. In the binder paper alignment unit 30, when the number of sheets 3 ′ reaches a preset number of sheets and becomes the sheet bundle 3 ″ shown in FIG. 2C, the positions of the binding holes are aligned and cooperate with the bind processing unit 40. Then, the binding component 43 is inserted into the hole portion, whereby a booklet 90 as shown in FIG.

  Next, a punch processing unit 20 ′ in which the drive system of the punch blade 21 is unitized will be described. FIG. 3 is a partially sectional side sectional view showing a configuration example of the punch processing unit 20 ′.

  The punch processing unit 20 ′ shown in FIG. 3 includes a punch blade 21, a fence 24, a main body 201, a punch blade unit 202, a link member 203, a drive mechanism 204, and an encoder 206.

  The main body 201 has a bridge shape in which the bridge member 209 is supported by the front plate 207 and the back plate 208. The main body 201 is formed by bending and pressing an iron plate at a desired position. The bridge member 209 has a box shape, and the bridge member 209 is provided with a drive mechanism 204.

  The drive mechanism 204 includes a motor 22, a cam shaft 81, a cam 82, an urging member (not shown), and a gear unit 205. The cam 82 is attached to the camshaft 81 in at least two places. The drive mechanism 204 drives the punch blade unit 202 when the cam 82 rotates. For example, the punch blade unit 202 has a body portion 210 to which a plurality of punch blades 21 are attached in series. The body part 210 is movably engaged with a cam 82 that rotates via a cam shaft 81 of a drive mechanism 204 in a state in which the body part 210 is biased in a certain direction (downward in this example) by a biasing member such as a coil spring (not shown). Combined.

  The gear unit 205 has a reduction gear (not shown). The motor 22 is engaged with a reduction gear, and the reduction gear is attached to the camshaft 81 and rotates the cam 82 via the camshaft 81. The number of teeth of the gear (small) attached to the motor 22 is “12”, the number of teeth of the gear (large) attached to the camshaft 81 is “59”, and the gear ratio is “1: 4.92. It is.

  The cam 82 converts the rotational movement of the motor 22 into a vertical reciprocating drive of the body part 210 that is biased in a fixed direction by a coil spring or the like. The vertical reciprocation of the body part 210 is the vertical reciprocation of the punch blade 21. The up and down reciprocating motion is given by the cam driving force through the cam shaft 81 by overcoming the urging force of the coil spring or the like. Thereby, the punching blade unit 202 is reciprocated up and down by the drive mechanism 204. A predetermined number of holes are opened in the sheet 3 having a predetermined thickness by the vertical reciprocation of the punch blade 21.

  In addition to the camshaft 81 of the drive mechanism 204, a solenoid 211 is disposed inside the bridge member 209 described above. A link member 203 is movably attached to the solenoid 211. A fence 24 is attached to the other end of the link member 203. The fence 24 has a plate shape longer than the length of the paper 3, and the reference position of the punch blade with respect to the paper 3 is set. The fence 24 is disposed below the punch blade unit 202. The link member 203 drives the fence 24 up and down based on the reciprocating motion by the solenoid 211 (closed gate opening operation).

  An encoder 206 is attached to the rotating shaft of the motor 22 described above, detects the motor rotation speed, and outputs a speed detection signal (speed detection information) S23. The encoder 206 has a transmissive optical sensor and an impeller attached to a motor shaft. In the impeller, for example, 32 slits are radially arranged around the rotation axis in the radial direction. The encoder 206 outputs the number of pulses Px = 157 (gear ratio 4.92 × number of slits 32) per cam rotation.

  In this example, the above-described impeller is provided with one slit on a different-diameter circle in addition to 32 slits, and the encoder 206 is counted as one reciprocating operation of the punch blade per one rotation of the cam. Generate a value.

  A position sensor 212 is disposed inside the bridge member 209, detects the punch blade unit 202 at a fixed position, and outputs a position detection signal S24 indicating whether or not the unit 202 has returned to the home position HP. . Here, the home position HP is a position where the tip of the punch blade 21 is away from the paper 3 and does not hinder the paper 3 into which the punch blade 21 is inserted, but hinders one reciprocal operation of the next punch. It is assumed that there is no specific stop position range (see FIG. 7). The punch processing unit 20 'is thus configured. The speed detection signal S23 and the position detection signal S24 are output to the control unit 50 shown in FIG.

  FIG. 4 is a block diagram illustrating a configuration example of a control system of the punch processing unit 20 '. The control system of the punch processing unit 20 ′ shown in FIG. 4 includes a control unit 50, a motor driving unit 120, and a solenoid driving unit 121.

  The control unit 50 constitutes an example of a control unit and includes a system bus 51. An I / O port 52, a ROM 53, a RAM 54, and a CPU 55 are connected to the system bus 51.

  A position sensor 212 is connected to the I / O port 52, detects a fixed position (hereinafter referred to as a home position HP) of the punch blade 21, and outputs a position detection signal S24. A transmissive optical sensor is used as the position sensor 212. In addition to the position sensor 212, an encoder 206, which is an example of a speed sensor, is connected to the I / O port 52, detects a motor rotation speed, and outputs a speed detection signal S 23 to the CPU 55. The CPU 55 monitors the forward and backward speeds of the punch blade 21 based on the speed detection signal S23.

  A system bus 51 is connected to the I / O port 52, and a ROM 53 is connected to the system bus 51. The ROM 53 stores a speed control program for returning the punch blade. The contents include a step of setting a division control section (hereinafter referred to as section #i (i = 1 to n)) obtained by dividing a specific section at the time of punch blade return path, and each section #i or section #i. A step of setting a target passage time of the punch blade 21 (hereinafter referred to as set values Th1, Th2,...) For each set group, and an actual passage time Tx (measurement passage time: Time) of the punch blade 21 for each section #i. A step of measuring A), a step of comparing the set value Th1 etc. set in the section #i with the passing time Tx obtained by actual measurement, and for driving the punch blade in the next section # i + 1 based on the comparison result This is a step for controlling driving or braking (braking) of the motor 22.

  The CPU 55 controls the driving or braking of the motor 22 based on the speed control program read from the ROM 53 when the punch blade returns. For example, when the passing time Tx obtained by actual measurement is smaller than the set value Th1 or the like, the CPU 55 brakes the punch blade driving motor 22 in the next section # i + 1 with a short brake, and the passing time Tx is set to the set value. If it is larger than Th1, etc., the punching blade driving motor 22 in the next section # i + 1 is controlled to be turned on and driven.

  Further, the motor drive unit 120 is connected to the CPU 55 through the I / O port 52, the motor drive signal S20 is input from the CPU 55, the motor 22 is driven based on the motor drive signal S20, and the CPU 55 is connected via the drive mechanism 204. The punch blade unit 202 is reciprocated up and down. For example, when 157 pulse signals based on the motor drive signal S20 are output from the motor drive unit 120 to the motor 22, the reduction gear makes a full circle. In this example, when the reduction gear makes a full turn, the cam 82 makes one rotation via the cam shaft 81 attached to the reduction gear, the punch blade 21 leaves the home position HP, punches the paper, and again returns to the home position. Return to HP.

  In the ROM 53 described above, in addition to the speed control program during the punch blade return path, for example, when reverse braking is performed by applying a force in the reverse direction of the motor 22, the reverse braking amount (hereinafter referred to as reverse brake holding). A program for calculating (time Y) is stored. The RAM 54 is used as a work memory when calculating the reverse brake force holding time Y. A general-purpose memory is used for the RAM 54 and temporarily stores data being calculated.

  In addition to the program for calculating the reverse braking amount, the CPU 55 calculates the reverse braking force holding time Y based on the speed detection signal S23 when the punch blade 21 returns, and the reverse brake is performed when the fixed position of the punch blade 21 is detected. Based on the holding time Y, the motor reverse brake control is executed. The speed detection signal S23 when the punch blade 21 returns is acquired from the encoder 206. The CPU 55 stops the punch blade 21 at the home position HP based on the position detection signal S24 of the punch blade 21 output from the position sensor 212 and the reverse brake holding time Y.

In this example, when the time for the punch blade 21 to pass through the specific section during the return path is X, the constants are α and β, and the reverse brake force holding time is Y,
Y = −αX + β (1)
Is calculated. α is a constant having a relation that Y becomes larger as X becomes smaller. Of course, the formula (1) for obtaining the reverse braking force holding time Y is merely an example, and is not limited to the linear formula (function), but may be a quadratic formula, a cubic formula, or the like.

  The ROM 53 stores a braking program for punch blade stop control in addition to a speed control program for punch blade return path. The contents include a step of detecting whether or not the punch blade 21 has entered the home position HP, and a step of executing reverse brake control of the motor 22 for a predetermined time from when the detected punch blade 21 has entered the home position. Then, after reaching the predetermined position within the predetermined time, the reverse brake control of the motor 22 is extended based on the time monitoring.

  Here, the reverse brake control of the motor 22 based on the time monitoring means the reverse brake control with the timer 56. For example, a timer 56 is connected to the CPU 55, and a unit monitoring time is set in the timer 56 when a predetermined number of pulses n are counted within a predetermined time of execution of reverse brake indicating the speed of the punch blade 21. 56, the reverse brake control is extended as it is, and when the next pulse n + 1 is counted while the timer 56 is counting, the timer 56 is reset and the reverse brake control is extended as it is. If the pulse n + j (j = 1 to 1) cannot be counted, the timer 56 count ends and the reverse brake control is stopped.

  The CPU 55 performs braking control of the motor 22 based on the braking program read from the ROM 53 during punch blade stop control. In this example, it is detected whether the punch blade 21 has entered the home position HP, the reverse brake control of the motor 22 is executed for a predetermined time from the time when the punch blade 21 has entered the home position HP, and within a predetermined time, After reaching the position, the reverse brake control of the motor 22 is extended based on the time monitoring. Note that after the reverse brake control is stopped, it is switched to the short brake.

  In addition, the CPU 55 monitors the rotation direction of the motor 22 and detects that the rotation direction of the motor 22 has changed when performing reverse brake control based on the time monitoring of the punch blade driving motor 22. The reverse brake control is stopped at that time.

  In addition to the motor drive unit 120, the solenoid drive unit 121 connected to the I / O port 52 receives a solenoid drive signal S21 from the CPU 55, and drives the solenoid 211 based on the solenoid drive signal S21. Then, the fence 24 is driven up and down.

  In this example, from the position detection signal S24 from the position sensor 212, a count value indicating the reciprocation of the punch blade = 1 is generated. Based on the count value, the CPU 55 can detect (identify) how many sheets 3 have been punched, and can notify the upper or lower control system of the number of punches. This constitutes a control system for the punch processing unit 20 '.

  5A to 5E are waveform diagrams showing an example state of the punch blade unit 202 and a control example of the motor 22. 6A to 6E are conceptual diagrams showing examples of states of the punch blade 21. FIG. In this example, the state I shown in FIG. 5A is when the punch blade unit 202 is at the home position HP (see FIG. 6A).

  FIG. 5B is a current waveform diagram illustrating an example of driving of the motor 22. In FIG. 5B, when the motor 22 is started at the position (i), the load at the time of activation (punch blade unit 202) is heavy, the waveform rises rapidly, and then the load gradually decreases, and the waveform falls gently. At this time, the punch blade unit 202 starts penetrating the paper 3 from the left in the state II shown in FIG. 5A (see FIG. 6B).

  Thereafter, in state III, the punch blade unit 202 finishes penetrating the paper 3. At this time, the punch blade unit 202 reaches the lowest point (see FIG. 6C). The punch blade 21 enters the return path. At this time, in the state IV shown in FIG. 5A, the punch blade unit returns from the left side and returns to the home position HP (see FIG. 6D). Then, the encoder 206 is monitored at the position (ii), and when the set pulse number Px (0 to 157) is reached, the first short brake control is executed on the motor 22. In the short brake control, the motor 22 is disconnected from the power source, the terminals are short-circuited (shorted), the motor 22 functions as a generator, and braking is performed using the armature reaction.

  FIG. 5C is a waveform example showing an example of home position detection by the position sensor 212. The position detection signal S24 shown in FIG. 5C is a case where the punch blade unit has escaped from the home position HP at a high level (hereinafter referred to as “H” level). The punch blade unit 202 stays at the home position HP at a low level (hereinafter referred to as “L” level).

  FIG. 5D is a waveform diagram of an example of speed detection by the encoder 206. In the figure, A, B, and C indicate control sections. The encoder 206 outputs a speed detection signal S23 during rotation of the motor 22 to the CPU 55. The speed detection signal S23 has a wide pulse cycle when the rotation speed of the motor 22 is low, and a short pulse period when the rotation speed is high.

  The pulse number Px shown in FIG. 5E is the output pulse number Px reflected in the speed detection signal S23 from the encoder 206 shown in FIG. Table 2 shows the relationship between the specific interval of the number of pulses Px = 85 to 130 and the set values Th1, Th2, and Th3 corresponding to the three control intervals A, B, and C.

  In this example, the pulse number Px = 85 to 130 indicating the specific section of the return stroke of the punch blade 21 is divided into 15 sections. One section has 3 pulses. Section # 1 is a section in which the encoder 206 outputs the number of pulses Px = 85 to 88. Similarly, section # 2 is a section in which the number of pulses Px = 88 to 91 is output. Hereinafter, also in the sections # 3 to # 15, the encoder 206 outputs the number of pulses Px = 91 to 130 every three pulses.

  The 15 sections of the return stroke of the punch blade 21 are further divided into three control sections (groups: set groups) A, B, and C, and set values Th1, Th2, and Th3 are assigned to the respective groups. According to Table 2, the set value Th1 is set in the sections # 1 to # 5, the set value Th2 is set in the sections # 6 to # 12, and the set value Th3 is set in the sections # 13 to # 15. Is set. For example, a relationship of Th1 <Th2 <Th3 is set between the three set values. This is for controlling the moving speed of the punch blade 21 to the home position gradually slower.

  The CPU 55 samples the speed detection signal S23 after executing the first short brake control. In this example, the number of output pulses Px of the encoder 206 is monitored, and the time (passing time) that passes through 15 sections (sections # 1 to # 15) obtained by dividing the set number of pulses Px = 85 to 130 in a specific section every three pulses. Tx) is measured. The passage time Tx is obtained for each section. The CPU 55 compares the passage times Tx = t1, t2,... With the time set for each section (set value Th1, etc.). When the relationship between the set value Th1 and the like and the passage time Tx is, for example, Th1> Tx, the short brake control is continued for the next three pulses. When Th1 <Tx, the motor 22 in the next section (during 3 pulses) is driven by ON control in the CW direction. This control is repeated until the home position HP is entered, and the speed control is executed.

  The CPU 55 executes the motor reverse brake control at the position (v) based on the reverse brake holding time Y obtained by the calculation here. A strong braking force is generated in the motor 22 during the holding time of the position (vi). The CPU 55 executes the second short brake control for the motor 22 at the position (vii) following the motor reverse brake control.

  When the motor 22 is controlled in this manner, when the speed of the punch blade unit 202 when returning is faster than the reference speed, the punch blade unit 202 can be stopped at the home position HP with a braking force stronger than the reference braking force. Thus, when the speed of the punch blade unit 202 when returning is slower than the reference speed, the punch blade unit 202 can be stopped at the home position HP with a brake force weaker than the reference brake force. In the state V shown in FIG. 5A, the punch blade unit 202 returns to the home position (see FIG. 6E). The punch blade 21 is configured to drive holes in the paper 3 by driving the punch blade 21 in a wave shape that undulates from side to side.

  7A to 7F are diagrams showing examples of punch blade strokes in one cycle in the punch blade unit 202. FIG.

  The punching blade unit 202 shown in FIG. 7A is in a standby state (position) at the home position HP. The punch blade unit 202 shown in FIG. 7B is in a state where the motor 22 is turned on and is lowered from the home position HP toward the sheet opening surface. The punching blade unit 202 shown in FIG. 7C is in a state where it reaches the lowest point through the surface of the paper to be opened. When passing through the sheet opening hole surface, a binding hole is formed at one end of the sheet-like sheet 3. Max in the figure is the maximum stroke of the punch blade unit 202.

  The punching blade unit 202 shown in FIG. 7D is in a state where the punching point unit 202 is lifted to the home position HP after passing through the surface of the sheet opening hole after leaving the lowest point. During this ascending period, the CPU 55 inputs the speed detection signal S23 when the punching blade is returned by the encoder 206, and calculates the reverse brake holding time Y based on the speed detection signal S23.

  The punch blade unit 202 shown in FIG. 7E is in a state immediately before the home position is detected. At this time, the motor reverse brake control is executed based on the reverse brake holding time Y that has been calculated and obtained previously. Thereby, the punch blade unit 202 can always be stopped in the home position HP. The punching blade unit 202 shown in FIG. 7F is stopped at the home position HP, and waits for the next sheet 3 punching process.

  8A to 8C are timing charts illustrating an example of motor control in the return stroke (specific section) of the punch blade 21. FIG.

  The pulse number Px shown in FIG. 8A is the output pulse number Px reflected in the speed detection signal S23 from the encoder 206 shown in FIG. In this example, the number of pulses Px = 88 separates the sections # 1 and # 2. Similarly, the pulse number Px = 91 separates the sections # 2 and # 3, the pulse number Px = 94 separates the sections # 3 and # 4, and the pulse number Px = 97 includes the sections # 4 and # 5. , The pulse number Px = 100 separates the sections # 5 and # 6, the pulse number Px = 103 separates the sections # 6 and # 7, and the pulse number Px = 106 separates the sections # 7 and # 8. ing.

  In the output waveform of the encoder 206 shown in FIG. 8B, the CPU 55 measures the passage time Tx = t1 in the interval # 1. The passing time Tx = t1 is obtained from the pulse width of the number of pulses Px = [88-85] in the section. Similarly, the passage time Tx = t2 is measured in the interval # 2. The passing time Tx = t2 is obtained from the total pulse width of the number of pulses Px = [91−88]. The passing time Tx = t3 is measured in the interval # 3. The passing time Tx = t3 is obtained from the sum of the pulse widths of the number of pulses Px = [94-91].

  Further, the passage time Tx = t4 is measured in the interval # 4. The passing time Tx = t4 is obtained from the total pulse width of the number of pulses Px = [97-94]. In section # 5, the transit time Tx = t5 is measured. The passing time Tx = t5 is obtained from the total pulse width of the number of pulses Px = [100−97]. In section # 6, the transit time Tx = t6 is measured. The passing time Tx = t6 is obtained from the sum of the pulse widths of the number of pulses Px = [103-100]. The CPU 55 measures the passing time Tx = tx until reaching the section # 15.

  In this example, when the CPU 55 detects the number of pulses Px “80” of the encoder 206 in the output waveform shown in FIG. 8C, the motor control signal S20 is output to the motor drive unit 120. The motor control signal S20 is a signal that falls from a high level (hereinafter referred to as “H” level) to a low level (hereinafter referred to as “L” level). Thereby, the short brake of the motor 22 is started. During the short brake period, the power source is disconnected from the motor 22 and the terminals are short-circuited.

  The CPU 55 compares the passing time Tx = t1 measured in the section # 1 shown in FIG. 8B with a preset set value Th1. When t1 <Th1 is obtained from the comparison result, the CPU 55 continues the control with the short brake for the section # 2.

  Next, the CPU 55 compares the passage time Tx = t2 with the set value Th1 in the interval # 2. When t2> Th1 is obtained from the comparison result, the comparison result of section # 2 is received, and in section # 3, the motor 22 is on-controlled in the CW direction. In this example, when the pulse number Px of the encoder 206 is “91”, the motor control signal S20 rises from the “L” level to the “H” level. As a result, the motor 22 is turned on in the CW direction, and is driven by applying a predetermined voltage between the terminals. Since the motor 22 has an electrical time constant and a mechanical time constant, a motor control signal S20 is output to the motor drive unit 120 and a predetermined voltage is applied to the motor 22 before actually reaching the target speed. It takes a rise time to do this.

  Further, the CPU 55 compares the passage time Tx = t3 with the set value Th1 in the interval # 3. When t3> Th1 is obtained from the comparison result, the comparison result of the section # 3 is received, and the ON control in the CW direction to the motor 22 is continued in the section # 4. In this example, even when the number of pulses Px of the encoder 206 is “94”, the motor control signal S20 is maintained at the “H” level, and the voltage applied between the terminals of the motor 22 is continued and driven. .

  Further, the CPU 55 compares the passage time Tx = t4 with the set value Th1 in the interval # 4. When t4 <Th1 is obtained from the comparison result, the comparison result of the section # 4 is received, and the short brake control of the motor 22 is executed in the section # 5. In this example, when the pulse number Px of the encoder 206 is “97”, the motor control signal S20 falls from the “H” level to the “L” level. Thereby, the short brake of the motor 22 is started. During the short brake period, the power source is disconnected from the motor 22 and the terminals are short-circuited.

  Hereinafter, as a result of comparing the passage time Tx = t5 and the set value Th1 in the section # 5, t5 <Th1 is obtained, and as a result of comparing the passage time Tx = t6 and the set value Th1 in the section # 6, t6 <Th1. As a result of comparing the passage time Tx = t6 with the set value Th1 in the section # 6, t6 <Th1 is obtained, and the passage time Tx = t7 is measured in the section # 7, and so on. In this case, when the pulse number Px of the encoder 206 is “100”, “103”..., The motor control signal S20 is maintained at the “L” level, and the short brake of the motor 22 is continued.

  9A to 9C are time charts showing examples of reverse brake control when the punching blade is stopped, and are examples of enlargement of the position (vi) between the state IV and the state V shown in FIGS.

  In this example, the home position HP is set to a section where the encoder 206 counts 18 pulses of the number Px of the speed detection signal S23 after detecting the home-in of the punch blade unit 202 (punch blade 21). For example, when the position sensor 212 detects the home-in of the punch blade 21 and the number of pulses Px of the encoder 206 is “140”, the home position HP is 18 pulses from “140” to “157”.

  The predetermined number of pulses is set to 8 pulses in order to start extending the reverse brake control. This is the middle of the home position HP, and is the part where the number of pulses Px of the encoder 206 is around “147”. For the unit monitoring time, 2.5 ms is set in the timer 56. This is because the encoder 206 is a value suitable for detecting one pulse (passing time) from the rise of the motor 22.

  In this example, when the position sensor 212 shown in FIG. 4 detects the home-in of the punch blade unit 202 (punch blade 21), the reverse brake control when the punch blade is stopped is performed following the speed control when the punch blade 21 returns. Be started. At this time, the CPU 55 identifies that the punch blade 21 has been home-in by the position detection signal S24 shown in FIG. 9B falling from the “H” level to the “L” level.

  The CPU 55 executes the motor reverse brake control at the position (v) based on the reverse brake holding time Y obtained by calculating in FIG. 5D before the punch blade 21 is home-in. As a result, a strong braking force is generated in the motor 22 during the holding time of the position (vi). Continuously with this motor reverse brake control, reverse brake control including extension when the punch blade is stopped is executed. FIG. 9A shows an example of a current waveform of the motor 22 by reverse brake control including extension when the punch blade is stopped.

  According to the reverse brake control example shown in FIG. 9A, when the number of pulses of the speed detection signal S23 is counted after the punch-in blade 21 is home-in and the predetermined number of pulses is counted within the reverse brake holding time (TCCW). At that time, the control is switched to the reverse brake control with the timer 56 of the unit monitoring time. For example, when the eighth pulse of the speed detection signal S23 after home-in of the punch blade 21 is counted, the CPU 55 sets the unit monitoring time = 2.5 ms in the timer 56 and starts the timer 56. The reverse brake control is extended as it is. Further, when the next ninth pulse is counted during the count of the timer 56, the CPU 55 resets the timer 56 and extends the reverse brake control as it is. Similarly, when the next pulse is counted while the timer 56 is counting, the CPU 55 resets the timer 56 and extends the reverse brake control as it is.

  In this example, the next thirteenth pulse is not counted while the timer 56 is counting. In this case, the CPU 55 ends the count of the timer 56 and ends the reverse brake control. Thereafter, the CPU 55 executes short brake control of the motor 22 at the position (vii) shown in FIG. 5D. By controlling the motor 22 in this way, when the punch blade is stopped, if the speed of the punch blade unit 202 is faster than the reference speed, the reverse brake control can be extended as it is based on the unit monitoring time = 2.5 ms. The punch blade 21 can be stopped within the home position HP without causing the blade 21 to overrun.

  10A and 10B are time charts showing an example of inversion detection when the punching blade is stopped.

  In this example, the rotation direction of the motor 22 is monitored during execution of the reverse brake control based on the time monitoring of the punch blade driving motor 22, and when it is detected that the rotation direction of the motor 22 has changed, The reverse brake control was stopped.

  In this example, the previous pulse interval (pulse 1 cycle) is compared with the current pulse interval (pulse 1 cycle). For example, when the position sensor 212 shown in FIG. 4 detects the home-in of the punch blade 21 and the position detection signal S24 shown in FIG. 10A falls from the “H” level to the “L” level, the CPU 55 The detected pulse 1 period (pulse interval) of the speed detection signal S23 as shown in FIG. 10B is measured, and the reversal detection of the motor 22 is performed by comparing the magnitude relation between the successive pulse 1 periods.

  For example, if the current pulse period is longer than the previous pulse period, the CPU 55 determines that the motor 22 continues to rotate forward. When the current one pulse period is shorter than the previous one pulse period, it is determined that the motor 22 has reversed its rotation direction and reverse rotation. That is, when the pulse interval becomes shorter than the immediately preceding pulse interval, the rotation direction changes and the state is accelerated. In the example shown in FIG. 10B, the motor 22 is rotating in the reverse direction from the normal rotation to the reverse rotation at the 12th pulse of the encoder output. When such reversal of the rotation direction is detected, the reverse brake control is terminated and the control is switched from the reverse brake to the short brake.

  As a result, in the encoder output (speed detection signal S23) shown in FIG. 9C, even when the unit monitoring time is set to the timer 56 and the reverse brake control is extended, the rotation direction of the motor 22 is the normal rotation. It is possible to prevent the situation where the motor is reversed and accelerated by reverse rotation.

  FIGS. 11-14 is a flowchart which shows the control example (the 1-4) of punch processing unit 20 'as embodiment.

  In this embodiment, it is assumed that when punching two or more holes in one end of the sheet 3, the punch blade driving motor 22 is driven to reciprocate the punch blade. For example, when the motor 22 rotates based on the motor control signal S20, the reduction gear makes a full turn, the cam 82 rotates once via the cam shaft 81 attached thereto, and the punch blade 21 starts from the home position HP. The paper is punched and returned to the home position HP again. The encoder 206 outputs 1 to 157 pulses regarding the speed detection signal S23. In this example, there is a case where the home position of the punch blade 21 is detected and then the control shifts to punch blade stop control.

  Under these control conditions, the motor drive unit 120 turns on the motor 22 when an activation command for the motor 22 is input from the CPU 55 in step ST1 of the flowchart shown in FIG. At this time, the motor control signal S20 output from the CPU 55 to the motor drive unit 120 rises from the “L” level to the “H” level.

  Next, in step ST <b> 2, the CPU 55 monitors the home position HP of the punch blade 21. At this time, when the position sensor 212 detects the home position HP, a position detection signal S24 is output to the CPU 55. In step ST3, the CPU 55 receives the position detection signal S24 and starts counting pulses. At this time, the encoder 206 outputs the speed detection signal S23 to the counter in the CPU 55. The counter counts (detects) the number of pulses Px = 1 to 157 obtained from the encoder 206.

  Thereafter, in step ST4, the CPU 55 monitors whether the pulse number Px reaches “80”. This monitoring is performed in order to find a point in time when the punch blade 21 punches the sheet 3 and then enters the return stroke when returning to the home position HP again. When the pulse number Px reaches “80”, the punching blade 21 has entered the return stroke. Therefore, the process proceeds to step ST5 and the CPU 55 starts short brake control until the pulse number Px reaches “84”. Continue control. In step ST6, it is determined whether the pulse number Px exceeds “84”. This is to find out whether or not the punch blade 21 has entered a specific section.

  When the pulse number Px exceeds “84”, the process proceeds to step ST7, and the CPU 55 determines whether the pulse number Px exceeds “99”. When the pulse number Px is 85 ≦ Px ≦ 99, the process proceeds to step ST8. In step ST8, the CPU 55 compares the passage time Tx with the set value Th1 and branches the control.

  When the passage time Tx is longer than the set value Th1, the process proceeds to step ST9, and the motor 22 is turned on in the CW direction by Px + 1 to Px + 3 with respect to the pulse number Px while passing through the next section # (N + 1). Alternatively, the motor 22 is free run during that time. The free run of the motor 22 means that the power terminal is opened and the motor 22 is rotated by inertia.

  According to the example shown in FIG. 8B, the CPU 55 compares the passage time Tx = t2 with the set value Th1 in the section # 2. Since t2> Th1 is obtained from the comparison result, the motor 22 is turned on in the CW direction in section # 3 in response to the comparison result in section # 2. Thereafter, the process returns to step ST7.

  If the passage time Tx is smaller than the set value Th1, the short brake of the motor 22 is continued for Px + 1 to Px + 3 with respect to the number of pulses Px while moving to step ST10 and passing through the next section # (N + 1). . According to the example shown in FIG. 8B, the passage time Tx = t1 measured by the CPU 55 in the section # 1 is compared with a preset set value Th1. Since the CPU 55 obtains t1 <Th1 from the comparison result, the control continues with the short brake for the section # 2. Thereafter, the process returns to step ST7.

  If the pulse number Px exceeds 99 in step ST7 described above, the process proceeds to step ST11 shown in FIG. In step ST11, the CPU 55 determines whether the number of pulses Px has exceeded “120”. When the pulse number Px is 100 ≦ Px ≦ 120, the process proceeds to step ST12. In step ST12, the CPU 55 compares the passage time Tx with the set value Th2 and branches the control.

  When the passage time Tx is longer than the set value Th2, the process proceeds to step ST13, and the motor 22 is turned on in the CW direction by Px + 1 to Px + 3 with respect to the pulse number Px while passing through the next section # (N + 1). Alternatively, the motor 22 is free run during that time. At this time, the CPU 55 compares the passage time Tx with the set value Th2 in the section #N. When Tx> Th2 is obtained from the comparison result, the comparison result of the section #N is received, and the motor 22 is controlled to be turned on in the CW direction in the section # (N + 1). Then, it returns to step ST11.

  If the passage time Tx is smaller than the set value Th2, the short brake of the motor 22 is continued for Px + 1 to Px + 3 with respect to the number of pulses Px while moving to step ST14 and passing through the next section # (N + 1). . At this time, the CPU 55 compares the passage time Tx measured in the section #N with a preset set value Th2. When the CPU 55 obtains Tx <Th2 from the comparison result, the CPU 55 continues the control with the short brake for the next section # (N + 1). Then, it returns to step ST11.

  When the pulse number Px exceeds “120” in step ST11 described above, the process proceeds to step ST15 shown in FIG. In step ST15, the CPU 55 determines whether the pulse number Px has exceeded “129”. When the pulse number Px is 121 ≦ Px ≦ 129, the process proceeds to step ST16. In step ST16, the CPU 55 compares the passage time Tx with the set value Th3 and branches the control.

  When the passage time Tx is longer than the set value Th3, the process proceeds to step ST17, and the motor 22 is turned on in the CW direction by Px + 1 to Px + 3 with respect to the pulse number Px while passing through the next section # (N + 1). Alternatively, the motor 22 is free run during that time. At this time, the CPU 55 compares the passage time Tx with the set value Th3 in the section #N. When Tx> Th3 is obtained from the comparison result, the comparison result of the section #N is received, and the motor 22 is turned on in the section # (N + 1). Thereafter, the process returns to step ST15.

  If the passage time Tx is shorter than the set value Th3, the short brake of the motor 22 is continued for Px + 1 to Px + 3 with respect to the number of pulses Px while moving to step ST18 and passing through the next section # (N + 1). . At this time, the CPU 55 compares the passage time Tx measured in the section #N with a preset set value Th3. When the CPU 55 obtains Tx <Th3 from the comparison result, the CPU 55 continues the control with the short brake for the next section # (N + 1). Thereafter, the process returns to step ST15.

  When the number of pulses Px exceeds 129 in step ST15 described above, the state of steps ST16 to ST17 is maintained until Px = 132, and the process proceeds to step ST19 shown in FIG. In step ST19, the CPU 55 measures the passage time Tx = tB in the section of 133 ≦ Px ≦ 137 with respect to the pulse number Px based on the speed detection signal S23. In this section, the motor 22 is maintained in a short brake state.

Then, in step ST20, the CPU 55 substitutes the passage time Tx = tB for X in the equation (1), substitutes 4.3 for the constant α, and substitutes 19 for β, and the reverse brake force holding time Y = TCCW is calculated. That is, the above equation (1) can be rewritten as equation (1) ′.
TCCW = −4.3tB + 19 (1) ′
However, α = 4.3 and β = 19 are experimental values, and are values when the present inventors have conducted experiments and an optimum reverse brake force holding time TCCW is obtained. The CPU 55 calculates the reverse brake holding time TCCW at the position (iv) shown in FIG. 5 using the above-described equation (1) ′. TCCW is a time for setting the speed of the punch blade 21 to “0”.

  Thereafter, in step ST21, the CPU 55 determines whether the punch blade 21 has been homed. At this time, when the punch blade 21 enters (IN) the home position HP, a position detection signal S24 indicating that the punch blade 21 has entered (IN) the home position HP is output from the position sensor 212 to the CPU 55.

  Then, the CPU 55 inputs the position detection signal S24 in step ST22, and performs reverse brake based on the function (reverse brake holding time Tx = TCCW [msec]) indicated by (1) ′ at the position (v) shown in FIG. To start. At this time, a strong braking force is generated in the motor 22 during the holding time of the position (vi) in FIG.

  Next, in step ST23, a counter (not shown) in the CPU 55 performs 8-pulse counting within the reverse brake holding time TCCW. As a result, when 8 pulses are not counted within the reverse brake holding time TCCW, the process proceeds to step ST28, and the CPU 55 switches the motor 22 through the motor drive unit 120 so as to switch the control from the reverse brake to the short brake. To control. Because of this control, the punch blade 21 that has received the short brake control stops, the speed control of the motor 22 is terminated.

  When 8 pulses are counted within the above-described reverse brake holding time TCCW, the unit monitoring time = 2.5 ms is set in the timer 56 from the point of time when the process proceeds to step ST24 and the 8 pulse count is finished, and the timer 56 To start reverse brake control.

  Thereafter, the process proceeds to step ST25, where the CPU 55 determines whether one pulse of the speed detection signal S23 is detected (passed) within the unit monitoring time = 2.5 ms. If one pulse of the speed detection signal S23 is not detected within the unit monitoring time = 2.5 ms, the process proceeds to step ST28, and the CPU 55 passes the motor drive unit 120 to switch the control from the reverse brake to the short brake. To control the motor 22. Because of this control, the punch blade 21 that has received the short brake control stops, the CPU 55 ends the speed control of the motor 22.

  If one pulse based on the speed detection signal S23 is detected within the unit monitoring time = 2.5 ms in the above step ST25, the process proceeds to step ST26 to reset the timer 56 and set the unit monitoring time = 2.5 ms to the timer. The timer 56 is started again by resetting to 56, and the reverse brake control is extended. At the same time, one pulse period (one pulse passage time) of the speed detection signal S23 after the timer is started is measured.

  Then, in step ST27, one pulse period (current one pulse passing time) based on the current speed detection signal S23 is compared with one pulse period (one previous pulse passing time) based on the immediately preceding speed detection signal S23. Determine the magnitude relationship. When the relationship between the current pulse 1 cycle and the immediately preceding pulse 1 cycle is such that the current pulse 1 cycle> the immediately preceding pulse 1 cycle, the process returns to step ST4 and the above-described processing is repeated.

  If the current pulse 1 cycle <the previous pulse 1 cycle, the process proceeds to step ST28, where the CPU 55 controls the motor 22 via the motor drive unit 120 so as to switch the control from the reverse brake to the short brake. To do. By this control, the punch blade 21 that has received the short brake control stops. The motor 22 stands by in a short brake state in which the power source is disconnected and the terminals are short-circuited. The CPU 55 ends the speed control of the motor 22 and waits for the next start command. In this example, the punch processing command is given to the CPU 55 from the upper control system.

  As described above, according to the binding device 100 to which the paper punching device according to the embodiment is applied and its control method, when punching holes in the predetermined paper 3, the CPU 55 determines whether the punch blade 21 has entered the home position HP. , And the reverse brake control of the punching blade driving motor 22 is executed until 8 pulses have elapsed since the punch blade 21 entered the home position HP. After 8 pulses have elapsed, the unit monitoring time = 2. 5 ms is set, and the reverse brake control of the motor 22 is extended until no pulse is detected within the unit monitoring time.

  Hereinafter, a normal operation example of the reverse brake when the punch blade is stopped and a comparative example of whether or not the reverse brake is extended will be described. 15A to 15C are time charts showing an example of normal operation of the reverse brake when the punch blade is stopped.

  According to the normal operation example of the reverse brake when the punch blade is stopped shown in FIG. 15A, after detecting the home-in shown in FIG. 15B, the reverse brake control is executed for the reverse brake holding time TCCW determined by the speed immediately before the home position. Thus, the punch blade 21 can be stopped within the home position HP without excessive or insufficient reverse brake. When the punch blade 21 is stopped, the encoder output pulse shown in FIG. 15C is stopped.

  In this case, in the current waveform shown in FIG. 15A, forward rotation correction (portion indicated by a wavy ellipse VI in the figure) is performed in the return path of the punch blade 21 in accordance with the situation such as the thickness of the paper, the environmental temperature, and the continuous punching operation. In addition, speed control for increasing the moving speed of the punch blade 21 is performed. Accordingly, even when the moving speed of the punch blade 21 is slower than that during normal operation when the paper is thick, the occurrence of short runs can be suppressed by speed control based on this forward rotation correction. This is because the brake characteristics in a low temperature environment are better than in a normal operating environment.

  On the other hand, FIGS. 16A and 16B are operation time charts showing a comparative example of whether or not the reverse brake is extended when the punch blade is stopped. According to the operation example without extension of the reverse brake control when the punching blade is stopped as shown in FIG. 16A, the home waveform is displayed with the HP waveform (A-2) shown in FIG. 16A without performing the forward rotation correction as shown in FIG. 15A. This is a case where the reverse brake control is executed only by the reverse brake holding time TCCW determined by the speed immediately before the home position after the in is detected. In this case, the reverse brake holding time TCCW is insufficient, and the punch blade 21 overruns without stopping within the home position HP.

  This is because the brake performance decreases when the motor 22 becomes hot due to a continuous punching operation or the like. Therefore, after the reverse brake shown in the current waveform (A-1) in FIG. 16A is finished, the punch blade 21 is stopped within the home position HP. Instead, it runs for several pulses of the encoder output (A-3) in FIG. 16A. As a result, overrun occurs. In the HP waveform (A-2) in FIG. 16A, the downward arrow is a portion where the punch blade 21 is home-out.

  According to the operation example with the extension of the reverse brake control when the punching blade is stopped shown in FIG. 16B, the home position is set to the HP waveform (B-2) shown in FIG. 16B without performing the forward rotation correction as shown in FIG. 15A. Detect in. Thereafter, the reverse brake control is executed only by the reverse brake holding time TCCW determined by the speed immediately before the home position, and the punch blade driving motor 22 is operated until 8 pulses have elapsed since the punch blade 21 entered the home position HP. Execute reverse brake control. Further, when 8 pulses have elapsed, the unit monitoring time = 2.5 ms is set in the timer 56, and the reverse brake control of the motor 22 is extended until no pulse is detected within this unit monitoring time. It is. That is, it is a time when the timer control functions in the punch stop control. In the figure, Tα is the reverse brake time extended by punch stop control according to the present invention.

  Here, comparing the reverse brake control shown in FIG. 16A with the reverse brake extension control shown in FIG. 16B, it can be seen that the reverse brake time Tα is extended by the timer control. When such timed monitoring control of the timer 56 functions, it is possible to prevent the motor 22 of the punch processing unit 20 ′ from over-rotating by extending the reverse brake control until the moving speed of the punch blade 21 is sufficiently lowered. Become. Accordingly, it is possible to eliminate the phenomenon that the punch blade 21 does not stop within the home position HP and overruns after the reverse brake shown in FIG. 16A is completed.

  Thereby, a punch blade can be efficiently stopped in the home position HP. Therefore, even when the thickness of the paper is small, even when the environmental change or the brake performance changes such as when the thickness is thick, the reciprocating operation based on the home position HP can be realized. In addition, it is possible to provide the paper punching device 100 with high accuracy and high reliability.

  In addition, regarding the timed monitoring control of the timer 56, the case where the timer 56 is connected to the outside of the CPU 55 is connected. However, the present invention is not limited to this, and a timer built in the CPU 55 may be used. The same effect can be obtained.

  The present invention is very suitable when applied to a binding device that binds recording paper output from a black-and-white and color copier or printing device.

It is a conceptual diagram which shows the structural example of the bind apparatus 100 which applied the paper punching apparatus as embodiment which concerns on this invention. (A)-(D) are process drawings which show the function example of the binding apparatus 100. FIG. It is a side sectional view of partial crushing showing an example of composition of punch processing unit 20 '. It is a block diagram which shows the structural example of the control system of punch processing unit 20 '. (A)-(E) is a wave form diagram which shows the example of a state of the punch blade unit 202, and the example of control of the motor 22. FIG. (A)-(E) are the conceptual diagrams which show the example of a state of the punch blade 21. FIG. (A)-(F) is a figure which shows the punch blade stroke example of 1 cycle in the punch blade unit 202. FIG. (A)-(C) are timing charts which show the motor control example in the return path | trip of the punch blade 21. FIG. (A)-(C) are time charts which show the example of reverse brake control at the time of a punch blade stop. (A) And (B) is a time chart which shows the inversion detection example at the time of a punch blade stop. It is a flowchart which shows the control example (the 1) of punch processing unit 20 '. It is a flowchart which shows the control example (the 2) of punch processing unit 20 '. It is a flowchart which shows the control example (the 3) of punch processing unit 20 '. It is a flowchart which shows the control example (the 4) of punch processing unit 20 '. (A)-(C) are time charts which show the normal operation example of the reverse rotation brake at the time of a punch blade stop. (A) And (B) is an operation | movement time chart which shows the comparative example of the extension presence or absence of the reverse brake at the time of a punch blade stop.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Paper conveyance path 11 1st conveyance path 12 2nd conveyance path 15 Flap 20 Punch processing part 20 'Punch processing unit 21 Punch blade
DESCRIPTION OF SYMBOLS 22 Motor 23 Side jogger 30 Binder paper alignment unit 40 Binding processing part 41 Movement mechanism 42 Binding cassette 43 Binding components 50 Control part (control means)
55 CPU
60 Discharging Unit 61 First Belt Unit 62 Second Belt Unit 100 Binding Device (Paper Punching Device)

Claims (4)

A paper punching device for punching holes in a predetermined paper,
A punching means for punching two or more holes in one end of the paper, having a punch blade driving motor for driving a reciprocating punch blade;
Control means for controlling the punching means,
The operation of braking the motor by applying a voltage having a polarity opposite to that at the time of forward rotation between the terminals of the motor is reverse braking, and the operation of disconnecting the motor from the power source and short-circuiting the terminals to brake the motor. When short-circuit braking, setting a unit monitoring time in the timer, and measuring the speed of the punch blade based on reverse braking of the motor in the unit monitoring time as timed monitoring,
The control means includes
Performing the first short-circuit braking on the motor at a predetermined position before a home position where the stop position of the punch blade is allowed;
Detect whether the punch blade has entered the home position where the stop position of the punch blade is allowed,
Execute the reverse braking on the motor for a predetermined time from the time when the punch blade enters the home position and measure the speed of the punch blade based on the time monitoring,
If the punching blade in the velocity measurement of the punch blades based on the timed monitoring has reached a predetermined position within a predetermined time, it extends the plugging on the basis of the time period monitored,
After the extension of the reverse braking, when the speed measurement of the punch blade becomes impossible, the reverse braking of the motor is terminated, and then the second short-circuit braking is performed on the motor, and the punch blade Is stopped at the home position . When the punch blade enters the home position where the stop position of the punch blade is allowed,
When the control means executes the reverse braking control with a timer,
When the timer counts a predetermined number of pulses within a predetermined time when performing reverse braking of the motor indicating the speed of the punch blade, a unit monitoring time is set in the timer,
Start the timer and extend the reverse braking control of the motor as it is,
When counting the next pulse indicating the speed of the punch blade during the counting of the timer, reset the timer and extend the reverse braking control as it is,
During the count of the timer, if unable to count the next pulse indicating a speed of the punch blade, according to claim 1, characterized that you stop control of the reverse brake with stops counting of the timer The paper punching device according to 1. When the punch blade enters the home position where the stop position of the punch blade is allowed,
The control means includes
When performing reverse braking and short circuit braking of the punch blade driving motor,
Monitoring the direction of rotation of the motor;
Stop the reverse braking when it is detected that the direction of rotation of the motor has changed,
Sheet punching device according to claim 2, characterized in Rukoto switching control to short-circuit braking the plugging. A control method for a paper punching device that drives a punch blade driving motor to reciprocate a punch blade when punching two or more holes in one end of the paper,
The operation of braking the motor by applying a voltage having a polarity opposite to that at the time of forward rotation between the terminals of the motor is reverse braking, and the operation of disconnecting the motor from the power source and short-circuiting the terminals to brake the motor. When short-circuit braking, setting a unit monitoring time in the timer, and measuring the speed of the punch blade based on reverse braking of the motor in the unit monitoring time as timed monitoring,
Executing the first short-circuit braking on the motor at a predetermined position before a home position where the stop position of the punch blade is allowed;
Detecting whether the punch blade has entered a home position where the stop position of the punch blade is allowed; and
Performing the reverse braking on the motor for a predetermined time from the time when the detected punch blade enters the home position and measuring the speed of the punch blade based on the time monitoring ;
If the punching blade in the velocity measurement of the punch blades based on the timed monitoring has reached a predetermined position within a predetermined time, the step of extending the reverse brake, based on the timed monitoring,
After the extension of the reverse braking, when the speed measurement of the punch blade becomes impossible, the reverse braking of the motor is terminated, and then the second short-circuit braking is performed on the motor, and the punch blade A method for controlling the sheet punching apparatus , comprising: stopping the sheet at a home position .

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