JPH08187681A - Electrically driven stapler and driving method thereof - Google Patents

Abstract

PURPOSE: To prevent a lock condition due to an overload by setting a time from separating a driver from a home position to leading to a clinch final position in a timer circuit, and reversing a motor of driving the driver in the point of time this preset time passes. CONSTITUTION: A clinch position sensor 4 is constituted of a home position sensor 10 and a timer circuit 13. In the home position sensor 10, a home position detection signal S1, when it is output, is received to a drive control part 8 to stop a motor 51. That is, the drive control part 8 receives a start signal ST to forwardly rotate the motor 51, and ending one cycle action, after pressing in a driving blade of a driver to a stapling position from a home position over again returned to the home position, is detected by the home position sensor 10. On the other hand, in the time circuit 13, a time from the home position sensor 10 to leading to a clinch ending position is measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary body driven by a motor, a motion converting mechanism for converting the rotary motion of this rotary body into a rectilinear reciprocating motion, and a standby position (home position) driven by the motion converting mechanism. The present invention relates to an electric stapler having a driver that moves between a position) and a binding position (clinching position) and drives a binding metal into a sheet-like object at the clinch position, and a driving method thereof.

[0002]

2. Description of the Related Art Conventionally, this kind of electric stapler has been designed so that more than an allowable number of sheets are bound at once, or they are accidentally re-stitched at a location where they have been stapled once, or they have been stapled on thick or hard sheets. In such a case, the motion converting mechanism, the driving unit such as the motor, or the like may be overloaded and stopped in the middle.

In such a case, the apparatus is stopped with the driving blade of the driver biting into the sheet, and in order to remove the sheet, the operator manually operates the apparatus drive unit so as to release the biting. You have to move it and pull the driver back. Further, when the stapler is mounted on a sorter or the like for continuously processing sheets, the continuous processing is interrupted by stopping the apparatus, and the efficiency of the apparatus is significantly impaired.

Therefore, when it is detected that the drive unit for driving the driver is in a predetermined overload state, it is known that the drive unit is reversed to pull back the driver only in the abnormal state. It is (Japanese Patent Fair 5-28
961).

This is shown in FIGS. 15 and 16. This stapler has a stapler gear 415 as a rotating body driven by a motor, and an upper unit 405 and a crank arm 409 as a motion converting mechanism for converting the rotational motion of the stapler gear 415 into a rectilinear reciprocating motion. That is, one end of the crank arm 409 arranged from the base 402 to the upper unit 405 is pivotally supported by the base 402 via the arm shaft 411, and the circular other end 409 a of the crank arm 409 is attached to the upper unit 405. It is rotatably fitted to the pivotally supported support shaft 410 via an eccentric wheel. The support shaft 410 is connected to a motor 412 via a stapler gear 415 and a motor gear 413. When the motor 412 rotates, the support shaft 410 rotates, the eccentric wheel rotates eccentrically, and the upper unit 405 moves to the crank. Arm 40
It is pulled or pushed by 9, and is swung about the hinge shaft 403 as a fulcrum. This upper unit 4
The swinging of 05 causes the driver 416 to move up and down so as to push or pull up the driving blade 416b fitted in the body 406. Normally, when the stapler gear 415 makes one rotation, the binding of sheets in one cycle operation is completed (F4 in FIG. 16).

Reference numeral 430a denotes a drive unit reverse rotation means of the control unit, which is rotated by the microswitch 429 in synchronization with the stapler gear 415 within a predetermined time.
If one rotation of 27 is not detected and it is determined that the motor 412 is in an unacceptable overload state, the driver 4
The motor 412 is rotated in the reverse direction so that the 16 driving blades 416b are returned to the standby position (F5 in FIG. 16). By doing so, it is possible to prevent the stapler from stopping halfway.

On the other hand, as another solution, a stapler provided with a paper pressure absorbing mechanism that can move the fulcrum shaft upward against the pushing force of the spring when the fulcrum shaft receives an excessive load in the upward direction. Is also known (JP-A-3-1906).
82). As shown in FIG. 17, this stapler has a drive gear 50 as a rotating body driven by a motor 502.
3 as a motion conversion mechanism for converting the rotational motion of the drive gear 503 into a rectilinear reciprocating motion, a boss 504 provided on the drive gear 503, and an interlocking locking rod 505 that is swung by the boss 504. . When the drive gear 503 is rotated by the motor 502, the boss 50 on the side surface of the drive gear 503 is rotated.
4 rotates, and as a result, the boss 504 of the interlocking locking rod 505.
Slides in the long hole 506, and reciprocates while the interlocking locking rod 505 swings up and down with the fulcrum shaft 507 as a fulcrum. Then, the driver 508 on the side opposite to the fulcrum shaft 507 moves in the opposite direction to the side of the elongated hole 506, and the driver 508 lowers to bind the sheets.

At that time, a fulcrum shaft 507 of the interlocking locking rod 505.
Is always pulled downward by the spring, and when an excessive load is applied in the upward direction, the fulcrum shaft 507 can move upward against the pushing force of the spring. Therefore, when the gap between the anvil 515 and the anvil 515 is adjusted so as to be completely bound when the minimum number of sheets to be bound (two sheets) is set, even if a larger number is set, the binding capacity must be within the maximum range. For example, the fulcrum shaft 507 floats against the elasticity of the spring and the boss 504
To allow normal rotation and maintain normal operation.

According to the present invention, a drive gear rotated by a motor, a motion conversion mechanism for transmitting the rotational motion of the drive gear to an arm (crank arm, interlocking locking rod) and converting the motion into a rectilinear reciprocating motion of the arm, The present invention relates to an electric stapler having a driver that is driven by an arm to move between a home position and a clinch position, and drives a binding member into a sheet-like object at the clinch position.

[0010]

However, the above-mentioned FIG.
5, the conventional technique of FIG. 16 detects the overload of the motor from the predetermined time required for one cycle of the stapling operation, and the predetermined time corresponding to the above-mentioned one cycle even after the lock state of the motion conversion mechanism occurs. The motor overload condition is not released until the time has passed. In addition, the current value of the motor that drives the stapler is measured, the motor is reversely rotated by detecting an overload of the motor when it exceeds a predetermined value, and the motor is reversely rotated when the driver pressure exceeds an allowable amount. Although it is also shown, since it is necessary to set a threshold value on the boundary between normal and abnormal, the threshold value must be a relatively large value. Moreover, since the threshold setting tolerance is narrow, the threshold setting becomes very delicate, and depending on how to set the threshold, a condition in which one cycle operation is not completed frequently occurs or the motor is overloaded. It may continue to be driven.

On the other hand, in the structure in which the paper pressure absorbing mechanism for absorbing the stroke difference due to the difference in the number of sheets to be bound is provided like the stapler in the prior art of FIG. 17, the fulcrum is used to form the paper pressure absorbing mechanism. It is necessary to make the shaft 507 movable and to provide a spring for pulling it down.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a stapler in which a locked state due to an overload does not occur during operation even if the number of sheets to be bound increases, before the overload occurs. To provide a stapler and a method of driving the stapler which require less overcurrent. Another object is to obtain a stapler that does not require a paper pressure absorbing mechanism.

[0013]

In order to achieve the above-mentioned object, the invention of claim 1 is a rotating body driven by a motor,
A motion converting mechanism that converts the rotary motion of the rotating body into a straight-line reciprocating motion, and a driver that is driven by the motion converting mechanism to move between a home position and a clinch position, and drives the binding metal into the sheet-like object at the clinch position. And a home position sensor that detects that the driver has returned to the home position, and when the sensor detects that the driver has left the home position, starts counting a predetermined timer time. A timer circuit, wherein the predetermined timer time is set as at least the time from when the driver leaves the home position to when the driver reaches the clinching end position, and when the start signal is received to rotate the motor in the normal direction, In response to a signal indicating that the circuit timer time has expired, It is of the structure in which the drive controller to reverse.

According to a second aspect of the present invention, a rotary body driven by a motor, a motion conversion mechanism for converting the rotary motion of the rotary body into a rectilinear reciprocating motion, and a home position driven by the motion conversion mechanism. In an electric stapler having a driver that moves between a clinch position and drives a binding member into a sheet at the clinch position,
A home position sensor that detects that the driver has returned to the home position, and a timer circuit that starts counting a predetermined timer time when the home position sensor detects that the driver has left the home position. A timer circuit in which the predetermined timer time is set as at least the time from the driver leaving the home position to the clinch end position,
Measures the current value supplied to the drive controller that rotates the motor forward in response to the start signal, and reverses the motor in response to the signal indicating that the timer has finished counting the timer time, and the motor that drives the stapler. Current measuring means and the motor supply current measured by the current measuring means
When the value exceeds the predetermined value before the timer time counted by the timer circuit elapses, it is determined that the overload state is more than the capacity of the motor and the signal for forcibly rotating the motor is sent to the drive control unit. And a determination means for giving to.

According to a third aspect of the present invention, in the electric stapler according to the first or second aspect, the timer time reaches a position immediately after the driving of the driver is completed when the number of sheets to be bound is zero or two. The time is set as the time.

According to a fourth aspect of the present invention, a rotary body driven by a motor, a motion conversion mechanism for converting the rotary motion of the rotary body into a rectilinear reciprocating motion, and a home position and a clinch position driven by the motion conversion mechanism. In an electric stapler having a driver that moves between the and the clinch position and drives the staple into the sheet-like material, a home position sensor that detects that the driver has returned to the home position and a motor that drives the stapler are supplied. When the current measured by the current measuring unit exceeds a predetermined value while the home position sensor detects that the driver has left the home position. , A judging means for judging the end of driving of the driver and outputting a clinch end signal. To forward the motor receives the start signal is of a structure in which a drive controller to reverse the motor by receiving a clinch completion signal from said decision means.

The inventions of claims 5, 6 and 7 are defined by claim 1,
It is an invention of two or four methods.

According to the eighth aspect of the present invention, the driver is driven in the direction from the home position to the clinch position by the forward rotation of the motor, and the set drive amount of the motor elapses at least from when the driver leaves the home position to when the clinch end position is reached. Then, the motor is rotated in the reverse direction to return the driver to the home position.

According to the first aspect of the present invention, first, the drive control section receives the start signal to rotate the motor forward, and the home position sensor detects that the driver has left the home position. Time counting starts. This timer time is set at least as the time from when the driver leaves the home position until when the driver reaches the clinch end position. Therefore, when the driver finishes driving the binding metal, the timing of the timer time of the timer circuit ends at that time or immediately thereafter, and the drive control unit receives the signal from the timer circuit and causes the motor to rotate in the reverse direction.

Therefore, even if the number of sheets to be bound increases, the clinch position only moves to a shorter stroke position of the driver, and even when the number of sheets to be bound exceeds a predetermined permissible number, the motion converting mechanism and the motor are moved. Need only wait for the reverse rotation timing of the motor to arrive at the clinch position, and it is not necessary to continue the motion beyond the clinch position corresponding to the paper pressure. Therefore, it is possible to prevent the locked state from occurring due to the overload of the motor.

Further, the timing for rotating the motor in the reverse direction is set in the middle of one rotation of the rotating body, that is, before the completion of one rotation, so that the conventional rotating body makes one rotation and returns. Compared with the case where the time is measured and the lock state is detected, the time during which the motor is in the overload state at the time of forward rotation can be shortened.

According to the second aspect of the present invention, the current value supplied to the motor is measured by the current measuring means, and the measured current value exceeds the predetermined value before the timer time counted by the timer circuit elapses. In this case, the determination means determines that the motor is in an overload state that is equal to or greater than the capacity of the motor and forcibly reverses the motor. Therefore, an overload condition exceeding the motor capacity is detected earlier than in the past, and the stapler is quickly returned to the home position.

According to the invention of claim 3, the above-mentioned claim 1 or 2
In the electric stapler described above, the timer time is set as the time to reach the position immediately after the driving of the driver is completed when the number of sheets to be bound is zero or two. You can afford.

According to the invention of claim 4, when the current measured by the current measuring means exceeds the predetermined value while it is detected that the driver has left the home position,
The judging means judges that the driving of the driver is completed and outputs a clinch completion signal to rotate the motor in the reverse direction via the drive controller. Therefore, in the case of overload, the motor reverses at that point, and the occurrence of the lock state due to the overload of the motor can be eliminated. Further, since the timing for rotating the motor in the reverse direction is set in the middle of one rotation of the rotating body, the time during which the motor is in the overload state during the forward rotation can be shortened as compared with the conventional case.

According to the invention of claim 5, the motor is normally rotated to drive the driver in the direction from the home position to the clinch position, and at least when the set time from when the driver leaves the home position until when the driver reaches the clinch end position, the motor is driven. In order to return the driver to the home position by reversing, the timing for reversing the motor is set at the time before one rotation of the rotating body is completed, and the time until the conventional rotating body makes one rotation and returns. Compared with the case where the lock state is detected by measuring, the time during which the motor is in the overload state during forward rotation can be shortened.

According to the sixth aspect of the present invention, the driver is driven in the direction from the home position to the clinch position by the forward rotation of the motor, and at least when the set time from when the driver leaves the home position to when the clinch end position elapses, the motor is driven. If the current supplied to the motor exceeds the specified value before the set time elapses, the driver is judged to be in an overload condition exceeding the capacity of the motor and forced to return. Since the motor is reversely rotated in reverse, an overload state exceeding the motor capacity is detected earlier than in the past, and the stapler is quickly returned to the home position.

According to the seventh aspect of the present invention, the driver is driven from the home position toward the clinch position by the normal rotation of the motor, and when the current supplied to the motor exceeds a predetermined value, it is judged that the driving of the driver is completed. Since the motor is rotated in the reverse direction, in the case of an overload, the motor will rotate in the reverse direction at that time, and the occurrence of the locked state due to the overload of the motor can be eliminated. According to the invention of claim 8, the difference in the number of bindings can be absorbed without providing the paper pressure absorbing mechanism.

[0027]

The present invention will be described below with reference to the illustrated embodiments.

In FIGS. 8 to 12, 2 is a stapler 1.
2 which is a frame body of which the anvil 21 is provided at the tip.
0 and the side wall 2 which is erected in a U shape from both sides of the base portion.
2, a body 30 which is a head unit main body of the head unit 3 is disposed between the side walls 22, and is supported by a hinge shaft 31 behind the body 30 so as to be vertically swingable. A front outer shell portion 40 is provided on the front surface of the body 30, and a molding member 70 is located between the front outer shell portion 40 and the front outer shell portion 40.
A molding block 60 is provided penetrating the front outer shell portion 40 and is pressed by a spring 50. These bodies 30,
Front shell 40, molding member 70, molding block 60
The spring 50 constitutes the head unit 3 described above.

The body 30 of the head unit 3 has a receiving base portion 3 for receiving the extending portion 91 of the cartridge 90.
2, a front upright portion 34 thereof, a top portion 35 extending from the front upright portion to the receiving base 32 side, and a guide column 36 standing on the top portion 35. The guide pillar 36 is provided with a driver 80, which is a driving tool disposed above the body 30.
The upper head portion 81 is fitted so as to be vertically movable. The driver 80 includes an upper head portion 81, a pushing claw 84, and a driving blade 86, and the upper head portion 81 is pulled or pushed by an arm 55 that is a component of a motion conversion mechanism described later, and a hinge shaft is provided. It is rocked around 31 as a fulcrum.

A drive motor 51 capable of rotating in both forward and reverse directions is provided above the head unit 3 as a drive source for the stapler 1, and a motor gear 52 is fixed to its output shaft. A large gear 54, which is a rotating body driven by a motor, is rotatably attached to the outer surfaces of both side walls 22 of the frame body 2, and the rotational force of the motor gear 52 is transmitted to the large gear 54 via a gear train 53. It is supposed to be done. Further, an arm 55 is rotatably attached to both side walls 22 by an arm shaft 56 serving as a fulcrum shaft, as a component of a motion converting mechanism that converts the rotational motion of the large gear 54, which is a rotating body, into a linear reciprocating motion.

The arm 55 has a slit 55a in which the shaft 81a of the upper head portion 81 of the driver 80 is fitted in one arm portion centering on the arm shaft 56, and the arm shaft 56 is centered. The other arm portion has a slide opening 55b having a cam surface 57. Then, the cam surface 5 in the slide opening 55b
A driving roller 58, which is a boss projecting from the surface of the large gear 54, is engaged with 7. The drive roller 58, together with the arm 55, constitutes a motion conversion mechanism that converts the rotational motion of the large gear 54 into a rectilinear reciprocating motion.

Therefore, when the large gear 54 rotates, the cam surface 57 and the driving roller 58 work to cause the end of the arm 55 opposite to the arm shaft 56 (the slit 5).
5a side) swings up and down, whereby the driver 80
Moves up and down so as to push or pull up the driving blade 86.

Further, the body 30 is provided with a front upright portion 34 having an opening 100 at a driving blade fitting position, and a feed spring 112 as an elastic portion is provided adjacent to the front upright portion 34. A feed member 104 provided with a feed claw 121 is disposed at the bottom, and the feed member 104 is provided.
Can move around an axis 105 serving as a fulcrum. Further, a molding block 60 having a holding groove 64 for holding the binding member 200 is arranged at a position facing the opening 100 of the front upright portion 34 so as to be movable left and right. Is biased by the spring 50 toward the front upright portion 34.

Further, a staple band member 94 formed by connecting a plurality of binding members 200 in a band shape adjacent to the feeding member 104.
A cartridge 90 accommodating therein is detachably arranged, and in the cartridge 90, a protrusion 91a serving as a fulcrum on the open short side of the feed spring 112 is formed in the middle of an extending portion 91 and a staple band. A plate spring-like return prevention plate 122 that presses the material 94 is fixedly provided, and holds the staple band material 94 in which the staples are connected in a band shape with an appropriate pressure contact force.

Further, a U-shaped bending forming member 70 is arranged adjacent to the driving blade 86, and the forming member 70 is formed.
When the driver 80 moves downward,
0 is pushed by the pushing claw 84 and is pushed down by a predetermined amount, and when the driving blade 86 moves upward, the driving blade 8
6 into the elongated hole 82 of a predetermined length, the molding member 70
The projecting portion 75 is engaged and pulled up. The pushing claw 84 is adapted to be detached from the molding member 70 when the molding member 70 is pushed by a predetermined amount.

Protrusions 75 provided on the molding member 70
Acts as a pressing unit that is brought into contact with the feed member 104 and is displaced by swinging, and presses the cam surface portion 120 of the feed member 104 when the molding member 70 is pushed down. As a result, the feed member 104 is rotated while distorting the feed spring 112 shown in FIG. 8, and the feed claw 121 is moved to a predetermined position (retracted position) in the direction opposite to the needle feed direction.
When 0 is pulled up and the pressure is released, the feed member 104 returns to the solid line position (advance position P2) in FIG. 8 by the action of the feed spring 112, which is an elastic portion, and at this time, the feed claw 121 causes the staple band member 94 to move. Is sent by a predetermined stroke amount.

Then, when the large gear 54 is rotated by the drive motor 51, the drive roller 58 turns, and the arm 55 follows the cam surface 57 which is in sliding contact with the drive roller 58.
6 is rotated centering on the tip side of the arm 55 (slit 55
The a side) moves downward so as to press the head portion 81 of the driver 80. The driving blade 86 is pushed and moves downward, and further, the body 30 is pushed by the driver 80 and moves toward the anvil 21 with the hinge shaft 31 as a fulcrum.
0 and the anvil 21 sandwich the sheet at the binding position where the sheet is bound and are in contact with each other.

On the other hand, the staple strip 94 stored in the cartridge 90 is fed from the opening 100 of the front upright portion 34 by the feeding claw 121 of the feeding member 104 to the forming block 60.
The leading edge of the binding material 200 is held in the holding groove 64 of the molding block 60 at its center portion. When the stapler 1 is attached to the body 30, the leading end 97 of the introduction path 97 of the cartridge 90 and the leading end 95a of the bottom 95 are fitted into the opening 100 of the body 30, and the ear 98 provided on the rear end face is attached. , Manually operated hinge shaft 31
The cartridge 90 and the body 30 are correctly aligned by being stopped by the locking claw 99a of the lever 99 which is rotated around the.

When the driver 80 is pushed and the driving blade 86 is pushed down, the molding member 70 pushed by the pushing claw 84.
Pushes and bends both ends of the binding metal 200 held by the molding block 60 into a U-shape. Further, the driving blade 86 is pushed down, the pushing claw 84 is disengaged from the forming member 70, and only the driving blade 86 is pushed down to form the molding block 60.
When reaching the taper portion of No. 2 and pushing the molding block 60 away, only the most advanced needle bent in a U-shape is sheared between it and the front upright portion 34, and the needle is driven into the sheet. Here, the driver 80 and the head unit 3 are at the clinch end position. In the case of a normal spectacle clinch, the needle point penetrating the seat is bent inward by the anvil 21, and in the case of the flat clinch as in this embodiment, the base portion 20 is used.
The clinch lever 24, which is oscillated downwardly, is pushed up by the support jaw 25 extending so as to be located further below the base portion 20 and is changed in the anvil 21 to push both ends of the needle into a flat plate shape. Crush and fix the sheets.

Then, the body 30 turns upward, the driver 80 is pulled up, the driving blade 86 moves upward, and returns to the standby position. Further, the arm 55 and the body 30 respectively move to the standby position (home position) shown in FIG. 4A, and the one cycle operation of sheet binding is completed.

When the driving blade 86 is returned, that is, when the projection 75 of the U-shaped bending member 70 is returned, the return force of the feed spring 112 causes the feed claw 121 of the feed member 104 to move to the retracted position. To the forward position P2, the next staple strip material 94 is fed into the holding groove 64 of the forming block, and is ready for binding the next sheet.

By the way, the setting of the clinching end position of the driver 80 and the head unit 3, that is, the setting of the gap with respect to the anvil 21 is adjusted so that the binding is completed at the minimum binding number of two. For this reason,
If the large gear 54 completes one cycle of operation as in the conventional case, the number of sheets to be bound increases,
For example, the maximum number of sheets of binding capacity (maximum allowable number of sheets) is 30.
If you try to bind one or more sheets, the motor 5
It causes a situation in which the stapler is stopped due to a load exceeding the capacity of 1. In order to avoid this, as shown in FIG. 13 (staple for eyeglass clinch), the arm shaft 56
Is pierced through a vertical elongated hole provided in the side wall 22 so that it can be moved slightly up and down.
The coil spring 59 is provided between the side wall 22 and the ear 22a of the side wall 22, and the arm shaft 56 is normally biased so as to take the lowest chain line position. When 30 sheets are set, as shown in FIG. As shown by the curved portion 56a,
It is necessary to provide a paper pressure absorbing mechanism or the like in which the arm shaft 56 floats upward by an amount corresponding to 0 paper pressure.

(1) First Embodiment Therefore, in the present invention, the operation of one cycle of the large gear is stopped, and the driver 80 having the longest stroke in the middle of the operation is stopped ( The clinch end position), to be precise, the timing corresponding to the position immediately after that is detected, and the motor 51
To reverse the movement and follow the original route to the motion conversion mechanism to return the stapler to the home position. By doing so, it is possible to eliminate the occurrence of the locked state due to the overload of the motor without the need to provide the paper pressure absorbing mechanism and the like.

The timing for rotating the motor in the reverse direction is a time when the number of stitches when the stroke amount of the driver 80 is the longest is zero or two, and here is a time corresponding to about 270 ° which is the clinching end position at the time of zero sheets. It is based on what is converted into time. The rotation angle of the large gear 54 is not directly detected because the position does not change forever when locked.

FIG. 1 shows a part of a controller 7 (FIG. 2) of the stapler 1 which is mainly composed of a CPU. In FIG. 1, reference numeral 4 denotes a clinch position detecting means, which is composed of a home position sensor 10 and a timer circuit 13. Reference numeral 8 denotes a drive control unit, which includes a drive unit reverse rotation means 8a and a forward / reverse driver 8b as shown in FIG. In FIG. 2, reference numeral 14 is a needle detection sensor that constitutes the remaining amount detection means.

As shown in FIG. 9, the home position sensor 10 is provided on the side wall 22 of the frame 2 with a reflection type optical sensor 11 including a pair of light emitting and receiving elements, and on the rear surface of the large gear 54 within a predetermined angle range. And the reflective surface 12 that has been formed.
Is detected, the driver 80 detects that the driver 80 is in the state shown in FIG.
A detection signal S1 indicating that the vehicle has returned to the upper limit standby position (home position) shown in FIG. The drive control unit 8 stops the motor 51 when receiving the home position detection signal S1. That is, when the drive control unit 8 receives the start signal ST and drives the drive motor 51 to rotate normally, and the large gear 54 rotates accordingly, the driver 80 is rotated.
When the driving blade 86 of is pressed from the home position to the binding position (clinch position) and then returned to the home position again by the reverse rotation drive of the motor, the end of one cycle operation is completed.
It is detected by.

The timer circuit 13 measures the time from the home position to the clinch end position. That is, it is reset while receiving the home position detection signal S1, and when the detection signal S1 disappears, time measurement is started, and a timer time T until reaching a preset "clinching end position" is measured. When the timer time T is reached, the output signal (clinch end signal) S2 is output. The drive control unit 8 receives the clinch end signal S2 and reverses the rotation of the motor 51 in the opposite direction.

The timer time T set by the timer circuit 13 is a clinch end position at which the driving of the driver 80 ends at least when the number of sheets to be bound is zero or when the minimum number of sheets is two (zero sheets in this example). It is the time to reach (correctly, the position immediately after that). The clinch end position means a position where the driving of the driver 80 is actually ended or a position immediately after that.

In the case of this embodiment, the timer time T is as shown in FIG.
As shown in, when the number of sheets to be bound is zero, the time is set to reach the position of 270 °, which is the clinching end position immediately after the driving of the driver 80 is completed. The reason why the time until reaching the position of approximately 220 ° at which the driving of the driver 80 is completed is not set is that a slight margin time is taken into consideration in consideration of an error and the like. As shown in FIG. In the case of a stapler in which the driving end position is adjusted to a position of approximately 220 ° when the number of sheets is zero, the reversal time of the motor can be set to an arbitrary time in the range of approximately 220 ° to approximately 270 °.

The needle detection sensor 14 is, as shown in FIG. 8, a bottom portion 32 of the receiving base portion 32 of the body 30.
The cartridge 9 is composed of a reflection type sensor including a light emitting / receiving element pair provided in a, and a transparent case 92 is seen through the cartridge 9.
The presence / absence of light reflected from the staple 200 of the staple strip 94 in 0 is detected. The drive control unit 8 constantly monitors the presence or absence of the binding 200 by the needle detection sensor 14 and stops the motor 51 when the binding is exhausted. (A) When Stitching the Minimum Number of Two Sheets Here, the one-cycle operation when binding the minimum number of two sheets will be described with reference to FIGS. 4 and 5.

Upon receipt of a start signal from the copying machine (not shown), the drive control section 8 causes the drive motor 51 to rotate in the forward direction. As a result, the large gear 54 moves from the position (point a) at the rotation angle of 0 ° shown in FIG.
When the driver 80 is rotated by a predetermined angle corresponding to the sector area of the reflecting surface 12 constituting the above, the driver 55 starts to be pushed down by the arm 55 of the motion converting mechanism, and the body 30 starts to move down from the home position (point b). Since the home position detection signal S1 disappears at this point, the timer circuit 13 starts measuring the timer time T.

When the body 30 descends and comes into contact with the sheet-like material 300 on the base portion 20 (point c), the driving blade 86 is pushed down relative to the body 30 and the pushing claw 8 is pressed.
The forming member 70 pushed by the No. 4 pushes and bends both ends of the binding member 200 held by the forming block 60 into a U shape (d).
point). Further, the driving blade 86 is pushed down, the pushing claw 84 is disengaged from the molding member 70, and only the driving blade 86 is pushed down to reach the taper portion of the molding block 60, and while pushing the molding block 60 away, Only the most advanced needle bent into a shape is sheared between the needle and the front upright portion 34, and the needle is driven into the seat (point e: completion of driver driving). The clinching end position at which the driving of the driver 80 ends is about 220 at the rotation angle of the large gear 54.
Position. FIG. 4B shows the state of the clinch end position where the driving of the driver 80 ends.

The state of the clinching end position is slightly succeeded thereafter, and when the rotational angle position (point f) of about 270 °, which is slightly delayed from point e, is reached, the timer time T in the timer circuit 13 increases. Clinch end signal S
2 occurs. In response to this signal S2, the drive unit reverse rotation means 8a of the drive control unit 8 switches the rotation direction of the motor 51 to the reverse direction via the forward / reverse driver 8b. That is, when the large gear 54 reaches the rotation angle position of about 270 ° (f
At the point), the first half cycle operation ends, and the second half cycle operation starts.

Incidentally, while the arm 55 and the body 30 remain at the clinch position, in the case of a normal eyeglass clinch, the needle point penetrating the seat is bent inward by the anvil 21.

Further, in the case of the flat clinch as in the embodiment of FIGS. 10 to 12, the clinch lever 24 hung swingably on the base portion 20 extends so as to be located further below the base portion 20. The sheets are pushed up by the supporting jaws 25 that have been changed to change in the anvil 21, and both ends of the needle are crushed into a flat plate shape to bind the sheets.

Next, when the latter half cycle operation is started, the arm 55 and the body 30 start to move upward (g
Point), that is, point g becomes the end position of the clinch position, the driver 80 is pulled up (point h), the driving blade 86 moves upward and returns to the standby position (i, j).
point). Further, the arm 55 and the body 30 respectively move to the standby position (home position) shown in FIG. 4A (points i and j), and the second half cycle operation of sheet binding is completed.

When the driving blade 86 is returned, that is, when the projection 75 of the U-shaped bending member 70 is returned, the return force of the feed spring 112 causes the feed claw 121 of the feed member 104 to move to the retracted position. To the forward position P2, the next staple strip material 94 is fed into the holding groove 64 of the forming block, and is ready for binding the next sheet. (B) When binding 30 sheets, which is the maximum allowable number, FIGS. 6 and 7 show the maximum number of sheets having the binding ability (maximum allowable number).
The operation when binding 30 sheets is shown.

In the same manner as when the number of sheets to be bound is two, the drive control section 8 receives the start signal and causes the drive motor 51 to rotate forward. As a result, the large gear 54 moves from the position (point a) at the rotation angle of 0 ° shown in FIG. 7 to the home position sensor 1
When the driver 80 is rotated by a predetermined angle corresponding to the sector area of the reflecting surface 12 forming 0, the driver 55 is pushed down by the arm 55 of the motion converting mechanism, and the body 30 starts to move down from the home position (point b). Since the home position detection signal S1 disappears at this point, the timer circuit 13 starts measuring the timer time T.

However, the body 30 descends and the base 2
The position (point c) that touches the sheet-shaped object 300 on 0 is 3
It starts early by an amount corresponding to 0 sheet pressure, and from that time point c, the driving blade 86 is pushed down relative to the body 30. Then, the forming member 70 pushed by the pushing claw 84 pushes and bends both ends of the staple 200 held by the forming block 60 into a U shape (point d). Further, the driving blade 86 is pushed down, the pushing claw 84 is disengaged from the molding member 70, and only the driving blade 86 is pushed down to form the molding block 6
When reaching the 0 taper portion and pushing away the molding block 60, only the most distal needle bent in a U-shape is sheared between the needle and the front upright portion 34, and the needle is driven into the seat (e
Point: End of driving of the driver).

The clinching end position at which the driving of the driver 80 ends depends on the number of sheets to be bound, but in this example handling 30 sheets, the rotation angle of the large gear 54 is about 210 °. The position. FIG. 6B shows the state of the clinch end position where the driving of the driver 80 ends.

Unlike the case where the number of sheets to be bound is two, since the maximum number of sheets, which is the maximum binding capacity, of 30 sheets is bound here, the large gear 54 of the motion converting mechanism does not rotate from the position of about 210 °, 6 (b) is restrained in the state of the clinch end position, and waits for the timer time T to elapse in that state.

When a predetermined timer time T elapses in the timer circuit 13, a clinch end signal S2 is generated in the timer circuit 13, and the drive controller 8 receives the signal S2 and reverses the rotation direction of the motor 51. Switch to.
That is, when the large gear 54 stays at the rotation angle position of about 210 ° and the time corresponding to the time of 270 ° at the time of zero sheet elapses, the first half-cycle operation ends and the second half-cycle operation ends. Be started.

Then, when the latter half cycle operation is started, the arm 55 and the body 30 start to move upward (g
Point), the driver 80 is pulled up (point h), the driving blade 86 moves upward and returns to the standby position (i, j).
point). Further, the arm 55 and the body 30 are respectively shown in FIG.
Move to the home position shown in (a) and (i, j
Point), the half cycle operation of the latter half of the sheet binding is completed.

In the above configuration, the timing corresponding to the position where the driver 80 having the longest stroke has finished (clinch end position) is captured, the motor 51 is rotated in the reverse direction, and the original route is traced to the motion conversion mechanism. Return the stapler to the home position. For this reason, even when the number of sheets to be bound increases and it is attempted to bind more than a predetermined allowable number of sheets, for example, the clinch position only moves to a shorter stroke position of the driver 80, and beyond that position. There is no need to continue exercising. The motion conversion mechanism and the motor need only wait for the reverse timing of the motor to arrive at the clinch position. Therefore, the lock state caused by the overload of the motor can be generated without the need to install a conventional paper pressure absorbing mechanism. Can be eliminated. The omission of the paper pressure absorbing mechanism is particularly effective in the spectacle clinch.

Further, since the timing for rotating the motor in the reverse direction is set in the middle of one rotation of the large gear 54 which is the rotating body, that is, before the completion of one rotation, the conventional rotating body makes one rotation and returns. The time during which the motor is in the overload state at the time of forward rotation can be shortened as compared with the case where the lock state is detected by measuring the time until arrival. (2) Second Embodiment FIG. 3 shows a structure in which the motor 51 is inverted by software according to a program written in the ROM of the controller 7, and the timer circuit 13 described above is also constructed by software.

That is, when the stapling operation start is judged (F1), the forward rotation signal is output to the motor 51, and the motor 5
1 rotates normally (F2). Then, the large gear 54 is rotated by being driven by the motor 54, and the driver 80 causes the motor 5 to rotate.
The driving force of 1 moves from the home position to the clinch position, and the stapler is moved to the clinch position at that position.
The sheet-like material is bound to be fixed.

On the other hand, from the time when the driver 80 leaves the home position, the timer circuit 13 configured by software is formed.
Thus, the timer time T starts to be measured (F3). The setting of the timer time T is also the same as that described in FIG. 1, and when the number of sheets to be bound is zero, immediately after the driver 80 finishes driving after leaving the home position (the clinch end position of about 270 °). ) Is set to time.

When this timer time T has elapsed, the program proceeds to the next step, and the motor 51 is moved back to the home position until the reflection surface 12 is detected by the reflection type optical sensor 11 constituting the home position sensor 10. Is reversed (F4). And driver 8
When 0 returns to the home position, the motor 51 is stopped (F5).

Also in this configuration, similarly to the above, it is possible to prevent the occurrence of the locked state by absorbing the difference in the paper pressure without the need to provide the conventional paper pressure absorbing mechanism. (3) Modified Example In the embodiment of FIGS. 1 and 3 described above, the clinch position detection means 4 is configured by the home position sensor 10 and the timer circuit 13, and the driver 80 sets the timing to reverse the motor 51 to the body 30. It was set by setting the time T from the time when they left the home position together until they reach the clinching end position when the number of sheets to be bound is zero or the minimum number of two sheets, but the reverse rotation timing may be set by other configurations. it can.

For example, a motor 51 for driving the stapler
While the home position sensor 10 detects that the driver 80 is away from the home position, that is, the home position sensor 10 outputs the home position detection signal S1. Under the condition of not outputting, when the current measured by the current measuring means exceeds a predetermined value, it is determined that the driving of the driver 80 is finished, and a determining means for outputting a clinch end signal is provided. The motor 51 may be reversely rotated by giving an overload detection signal from the means to the drive control unit 8. In this case, the above determination means
Before the timer time T elapses, it is preferable to determine whether or not the electric current supplied to the motor exceeds a predetermined value.
That is, when the power supply current of the motor exceeds the predetermined value before the timer time T elapses, it is determined that the overload state exceeds the capacity of the motor 51, and the determination means determines the timer time T.
It is preferable that a force reverse signal for forcibly rotating the motor is output before the arrival of the signal, and the drive control unit 8 receives this signal to reverse the motor to return it to the home position and generate an alarm. This configuration of forcibly reversing can also be adopted in a mode in which the above reversal timing is determined from the passage of time.

A pressure sensor may be provided in the needle pressing portion for driving the needle, for example, a part of the driver 80, and the motor may be rotated in the reverse direction when the pressure exceeds the allowable amount. Furthermore, a pulse motor or a DC motor may be attached with an encoder or the like to set a predetermined rotation amount, and the motor may be rotated in the reverse direction to a predetermined rotation amount from the home position.

[0072]

In summary, according to the present invention, the following excellent effects can be obtained.

(1) According to the stapler of claim 1, by capturing the timing corresponding to the clinching end position where the driver has driven with the longest stroke, the motor is rotated in the reverse direction and the original route is set to the motion conversion mechanism. It traces back the stapler to the home position. Therefore, the motion conversion mechanism and the motor only have to wait for the reverse rotation timing of the motor to arrive at the clinch position, and the occurrence of the locked state due to the overload of the motor can be eliminated. It is also possible to absorb the difference in the number of sheets to be bound without providing a paper pressure absorbing mechanism or the like.

Further, the timing for rotating the motor in the reverse direction is set in the middle of one rotation of the rotating body, that is, before the completion of one rotation, so that the conventional rotating body makes one rotation and returns. Compared with the case where the time is measured and the lock state is detected, the time during which the motor is in the overload state at the time of forward rotation can be shortened.

(2) According to the invention of claim 2, the current value supplied to the motor is measured by the current measuring means, and the measured current value is measured before the timer time measured by the timer circuit has elapsed. When the value exceeds the predetermined value, the judging means judges that the motor is overloaded, which is more than the capacity of the motor.
Force the motor to reverse. Therefore, an overload condition exceeding the motor capacity is detected earlier than in the past, and the stapler is quickly returned to the home position.

(3) According to the invention of claim 3, claim 1
Alternatively, in the electric stapler described in 2, since the timer time is set as the time until the position immediately after the driving of the driver is completed when the number of sheets to be bound is zero or when the number of sheets is two, the timing for reversing the motor There is room for setting.

(4) According to the invention of claim 4, when the current measured by the current measuring means exceeds the predetermined value while it is detected that the driver has left the home position, the judging means is provided. Thus, it is determined that the driving of the driver is completed, and the motor is rotated in the reverse direction via the drive control unit. Therefore, in the case of overload, the motor reverses at that point, and the occurrence of the lock state due to the overload of the motor can be eliminated. Further, since the timing for rotating the motor in the reverse direction is set in the middle of one rotation of the rotating body, the time during which the motor is in the overload state during the forward rotation can be shortened as compared with the conventional case.

(5) According to the invention of claim 5, the driver drives the driver in the direction from the home position to the clinch position by the forward rotation of the motor, and at least the set time from when the driver leaves the home position to when the clinch end position is reached. After the lapse of time, the motor is rotated in the reverse direction to return the driver to the home position. Therefore, the timing for rotating the motor in the reverse direction is set at the time before one rotation of the rotating body is completed. The time during which the motor is in the overload state during forward rotation can be shortened compared to the case where the lock state is detected by measuring the time until the motor comes on.

(6) According to the invention of claim 6, the driver drives in the direction from the home position to the clinch position by the forward rotation of the motor, and at least the set time from when the driver leaves the home position to when the clinch end position is reached. When the current elapses, the motor is rotated in the reverse direction to return the driver to the home position, and if the current supplied to the motor exceeds the predetermined value before the set time elapses, it means that the motor is overloaded. By making a judgment and forcibly rotating the motor in the reverse direction, an overload condition that exceeds the capacity of the motor is detected earlier than before, and the stapler is quickly returned to the home position.

(7) According to the invention of claim 7, the driver is driven in the direction from the home position to the clinch position by the forward rotation of the motor, and when the current supplied to the motor exceeds a predetermined value, the driving of the driver is completed. Since the motor is judged to be reverse and the motor is rotated in the reverse direction, in the case of overload, the motor reverses at that point, and the occurrence of the locked state due to the overload of the motor can be eliminated. (8) According to the invention of claim 8, when the drive amount of the motor reaches a predetermined value, it is reversed. Therefore, it is possible to absorb the difference in the number of sheets to be bound without providing a paper pressure absorbing mechanism or the like. .

[Brief description of drawings]

FIG. 1 is a diagram showing a control device portion of a stapler in an embodiment of the present invention.

FIG. 2 is a diagram showing an outline of a control device portion of a stapler in one embodiment of the present invention.

FIG. 3 is a view showing the operation of the stapler according to another embodiment of the present invention.

FIG. 4 is a side view showing an operation when binding the minimum number of two sheets in the stapler of the present invention.

FIG. 5 is a timing diagram showing the operation in the case of binding the minimum number of two sheets in the stapler of the present invention at the rotational angle position.

FIG. 6 is a side view showing an operation when binding the maximum allowable number of 30 sheets in the stapler of the present invention.

FIG. 7 is a timing chart showing an operation when binding the maximum allowable number of 30 sheets in the stapler of the present invention.

FIG. 8 is a vertical cross-sectional view showing the stapler of the present invention in a state where the feed claw is changed to the forward position.

FIG. 9 is a side view of another stapler of the present invention.

FIG. 10 is a front view of another stapler of the present invention.

FIG. 11 is a top view of another stapler of the present invention.

FIG. 12 is a rear view of another stapler of the present invention.

FIG. 13 is a cross-sectional view showing a stapler configured to rotate a large gear once for comparison.

14 is a timing chart showing the operation of the main part of the stapler of FIG.

FIG. 15 is a diagram showing a conventional stapler.

16 is a flow chart showing the operation of the conventional stapler of FIG.

FIG. 17 is a diagram showing another conventional stapler.

[Explanation of symbols]

 1 stapler 2 frame body 3 head unit 4 clinch position detection means 7 control device 8 drive control section 8a drive section reverse rotation means 8b forward / reverse driver 10 home position sensor 11 reflective optical sensor 12 reflective surface 13 timer circuit 14 needle detection sensor 20 Base part 21 Anvil 22 Side wall 22a Ear 24 Clinch lever 25 Support jaw 30 Body (head unit main body) 31 Hinge shaft 32 Receiving base part 32a Bottom part 34 Front upright part 35 Top part 36 Guide column 40 Front outer shell part 50 Spring 51 Motor 52 Motor gear 53 Gear train 54 Large gear (rotating body) 55 Arm 55a Slit 55b Sliding opening 56 Arm shaft (fulcrum shaft) 56a Curved portion 57 Cam surface 58 Drive roller (boss) 59 Coil spring 60 Forming block 64 Holding groove 70 C-shaped bending forming member 75 Projection portion 80 Driver (striking tool) 81 Upper head portion 81a Shaft 82 Vertical long hole 84 Striking push claw 86 Striking blade 90 Cartridge 91 Extending portion 91a Protrusion (fulcrum) 92 Case 94 staple band material 95 bottom portion 95a tip portion 97 introduction path tip portion 98 ear portion 99 lever 99a locking pawl 100 body opening portion 104 feed member 105 shaft 112 feed spring (elastic portion) 120 cam surface portion 121 feed pawl 122 return prevention plate 200 staple (needle) 300 sheet material P2 retreat position S1 home position detection signal S2 clinch end signal ST start signal T timer time 402 base 403 hinge shaft 405 upper unit 406 body 409 crank arm 409a other end 410 spindle 411 arm 412 motor 413 motor gear 415 Sutepuragiya 416 driver 416b driving blade 427 Sensakamu 429 micro switch 430a driver reverse rotation means 502 motor 503 drive gear 504 boss 505 interlocking latching rod 506 slide slot 507 the fulcrum shaft 508 driver 515 anvil

Claims (8)

[Claims] 1. A rotating body driven by a motor, a motion converting mechanism for converting the rotational motion of the rotating body into a rectilinear reciprocating motion, and moving between a home position and a clinch position driven by the motion converting mechanism. However, in an electric stapler having a driver that drives a binding material into a sheet-like object at the clinch position, a home position sensor that detects that the driver has returned to the home position, and that the driver has left the home position A timer circuit which, when detected, starts counting a predetermined timer time, wherein the predetermined timer time is set as at least the time from when the driver leaves the home position to when it reaches the clinching end position. , When the start signal is received, the motor is rotated normally and the timer circuit An electric stapler, comprising: a drive control unit that reverses a motor in response to a signal indicating that the timer time has been measured. 2. A rotating body driven by a motor, a motion converting mechanism for converting the rotary motion of the rotating body into a rectilinear reciprocating motion, and moving between a home position and a clinch position driven by the motion converting mechanism. Then, in an electric stapler having a driver that drives a binding material into a sheet at the clinch position, a home position sensor that detects that the driver has returned to the home position, and the home position sensor causes the driver to leave the home position. A timer circuit that starts counting a predetermined timer time when it is detected, wherein the predetermined timer time is set as at least the time from when the driver leaves the home position to when it reaches the clinching end position. The circuit and the start signal are received to rotate the motor forward, A drive control unit that reverses the motor in response to a signal indicating that the timer of the timer circuit has finished measuring time, a current measuring unit that measures the current value supplied to the motor that drives the stapler, and the current measuring unit. If the measured power supply current of the motor exceeds a predetermined value before the timer time measured by the timer circuit elapses, it is determined that the overload condition exceeds the capacity of the motor, and the motor is forcibly forced. An electric stapler, which is provided with a determination means for giving a signal for reversing the drive control section to the drive control section. 3. The electric stapler according to claim 1 or 2, wherein the timer time is set as a time until reaching a position immediately after the driving of the driver is completed when the number of sheets to be bound is zero or two. An electric stapler characterized in that 4. A rotating body driven by a motor, a motion converting mechanism for converting the rotary motion of the rotating body into a rectilinear reciprocating motion, and moving between a home position and a clinch position driven by the motion converting mechanism. Then, in an electric stapler that has a driver that drives a staple into a sheet at the clinch position, the home position sensor that detects when the driver has returned to the home position and the current value that is supplied to the motor that drives the stapler are compared. When the current measured by the current measuring means exceeds a predetermined value while the current measuring means and the home position sensor detect that the driver has left the home position, the driving of the driver is completed. Judgment means for judging the time and outputting a clinch end signal, and a start signal Receiving rotated forward the motor, the electric stapler is characterized by providing a drive control unit to reverse the motor by receiving a clinch completion signal from said decision means. 5. A rotating body driven by a motor, a motion converting mechanism for converting the rotational motion of the rotating body into a rectilinear reciprocating motion, and moving between a home position and a clinch position driven by the motion converting mechanism. However, in an electric stapler that has a driver that drives the binding material into the sheet at the clinch position, the driver drives the driver from the home position toward the clinch position by the forward rotation of the motor, and at least the clinch end position after the driver leaves the home position. A method for driving an electric motor, wherein the motor is rotated in the reverse direction to return the driver to the home position when a set time up to is reached. 6. A rotating body driven by a motor, a motion converting mechanism for converting the rotary motion of the rotating body into a rectilinear reciprocating motion, and moving between a home position and a clinch position by being driven by the motion converting mechanism. However, in an electric stapler that has a driver that drives the binding material into the sheet at the clinch position, the driver drives the driver from the home position toward the clinch position by the forward rotation of the motor, and at least the clinch end position after the driver leaves the home position. When the set time up to is reached, the motor is rotated in the reverse direction to return the driver to the home position, and if the current supplied to the motor exceeds the specified value before the set time elapses, the motor will exceed the motor capacity. Judging that it is overloaded,
A method of driving an electric motor, which comprises forcibly rotating the motor in the reverse direction. 7. A rotating body driven by a motor, a motion converting mechanism for converting the rotary motion of the rotating body into a rectilinear reciprocating motion, and moving between a home position and a clinch position driven by the motion converting mechanism. Then, in an electric stapler having a driver that drives a binding material into a sheet at the clinch position, the motor is rotated forward to drive the driver from the home position to the clinch position, and the current supplied to the motor exceeds a predetermined value. At this time, the method for driving the electric stapler is characterized in that the motor is rotated in the reverse direction when it is judged that the driving by the driver is completed. 8. A rotating body driven by a motor, a motion converting mechanism for converting the rotary motion of the rotating body into a rectilinear reciprocating motion, and moving between a home position and a clinch position driven by the motion converting mechanism. Then, in an electric stapler that has a driver that drives the binding metal into the sheet at the clinch position and an anvil that receives and bends the tip of the binding needle driven by the driver, the driver rotates the motor from the home position to the clinch position. Direction, and at least when the set drive amount of the motor from the driver leaving the home position to the clinching end position elapses, the motor is reversed to return the driver to the home position. Driving method.