JPH0957647A - Motor-driven stapler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display jam occurrence in a motor-driven stapler in case any staple buckles to jam in a driver guide. SOLUTION: A microswitch 26 is installed in the rear part of a staple pusher 24. When a staple is to be driven, the legs of staple S folded by a forming plate 15 push the front face of the staple pusher 24 to cause its retreating, and the microswitch 26 is actuated. When the forming plate 15 rises, the pusher 24 advances, and the microswitch 26 is turned off. If staple buckles in the passage in the driver 14 to cause jamming, the staple sheet 27 can not advance at the end of one cycle of operation, and therefore, the staple pusher 24 having once retreated does not advance, so that the turned-on condition of the microswitch 26 continues, and jamming is displayed in the display part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric stapler, and more particularly to an electric stapler capable of detecting a staple clogging accident.

[0002]

2. Description of the Related Art When using a stapler, the staples may not be able to penetrate the paper and buckle due to defective forming of the staples or an excessive number of paper sheets, or the buckled staples may be jammed in the driver guide and used for spelling work. May cause problems.

Conventionally, as such a driving failure detecting means, there is known one which monitors the driving current of the motor and detects the occurrence of the driving failure by the change of the current value due to the increase of the load of the motor when the driving failure occurs. .

[0004]

When a buckled staple is jammed in the driver guide, subsequent spelling cannot be performed unless the jammed staple is removed. However, the conventional electric stapler that simply detects improper driving is a stapler. It cannot be determined whether the bent staples are taken out from the electric stapler together with the paper or remain in the driver guide. Therefore, in an automatic system machine such as a copying machine in which a copying machine and an electric stapler are integrally incorporated, when the stapling operation is restarted after the improper driving, unstitched booklets may be continuously fed out.

Therefore, a technical problem to be solved in order to prevent a decrease in work efficiency by enabling a prompt response to a clogging accident by detecting a staple clogging accident, and the present invention is described above. It aims to solve problems.

[0006]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above-mentioned object, and is an electric stapler using a staple sheet in which linear staples are adhered in parallel, and the staples are gate-shaped. The staple pusher, which moves backward and forward in conjunction with the forming plate that is formed into, and biases the staples toward the driver, is provided with a sensor for detecting the back-and-forth movement of the staple pusher, and based on the detection signal of the sensor. The present invention provides an electric stapler configured to display a stapler jam on the display unit when a control unit for driving the display unit is provided and the staple pusher is in the retracted position at the end of the driving operation.

In the above-mentioned electric stapler, when the staples buckle in the passage of the driver and become jammed, the staple sheet cannot move forward at the end of the driving operation for one cycle, so that the staple pusher temporarily retracted by the forming plate moves forward. Instead, it is detected from the output state of the sensor that the staple pusher is at the retracted position, and the jam of the staple is displayed on the display unit.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a chassis of an electric stapler 1, in which a first link arm 4 is attached to a shaft 3 at a rear portion of a frame 2.
And a staple guide 5 are pivotally mounted so as to be vertically rotatable. A motor 6 is arranged below the shaft 3, and the motor 6
Is transmitted to a reduction gear mechanism (not shown).

A connecting plate 9 is loosely fitted to an eccentric shaft 8 provided on the side surface of the frontmost gear 7 of the reduction gear mechanism, and the connecting plate 9 is attached to the first link arm 4 by the compression coil spring 1.
0. The rotation of the gear 7 is converted into the vertical movement of the connecting plate 9, the first link arm 4 and the staple guide 5 move down and up from the upper standby position shown in the same figure, and the clincher provided in the front part of the frame 2 is moved. The staple supplied from the staple cartridge 12 is driven by being pressed against the portion 11.

A driver 14 and a gate-shaped forming plate 15 are vertically slidably mounted on the back side of the face plate 13 at the tip of the staple guide 5, and the drivers 14 and the forming plate 15 project left and right from above. The convex portions 14a and 15a are the link arms 4.
Are engaged with holes 4a provided on the left and right side surfaces of the.

A conveyor belt (not shown) is arranged on the staple guide 5 from the rear to the vicinity of the front end.
The reduction gear mechanism causes the conveyor belt to rotate in conjunction with the lifting operation of the link arm 4. The lower surface of the staple cartridge 12 mounted on the upper rear surface of the staple guide 5 is open, and the lowermost staple sheet stacked in the staple cartridge 12 contacts the conveyor belt and is sequentially transferred forward.

A staple sensor (not shown), which is a reflection type photosensor, is embedded in the rear portion of the staple guide 5 with the light emitting direction directed upward, and the staple sheet in the staple cartridge 12 located above the staple sensor. The presence or absence of is detected by reflected light.

The shaft 1 provided on the front side surface of the frame 2
A second link arm 17 is pivotally attached to 6 and a pin 19 provided in the intermediate portion of the first link arm 4 is inserted into an elongated hole 18 provided in the intermediate portion of the second link arm 17 to 1
And the second link arms 4 and 17 are connected. Second
The tip end of the link arm 17 is separated into upper and lower parts and protrudes rearward of the frame 2, and a slit plate 20 is installed between the upper and lower ends.

On the slit plate 20, a plurality of slits 21 having the shaft 16 as a radiation center are arranged in an arc shape at equal angular intervals, and the light emission of a photo interrupter 23 attached to the rear portion of the frame 2 via a bracket 22. The light receiving unit and the light receiving unit face each other with the slit plate 20 interposed therebetween.

During the stapling operation of the electric stapler 1, the first
Link arm 4 and second link arm 17 interlock, slit plate 20 descends and rises, and the optical path of photointerrupter 23 is interrupted by the rotation of slit plate 20 in the same manner as a general rotary encoder. The signal is input to the control unit.

As shown in FIG. 2, a staple pusher 24 is attached to the front portion of the staple guide 5 so as to be movable back and forth. The staple pusher 24 is urged toward the front face plate 13 by the spring 25, presses both side legs of the staple S formed by the forming plate 15 from the rear to the front, and the staple S at the forefront is pressed to the face plate 13. Press it.

A micro switch 26 is arranged at the rear portion of the staple pusher 24, and both side legs of the staple S bent by the forming plate 15 at the time of staple driving operation slide on the front surface of the staple pusher 24 to retreat. . Then, the retracted staple pusher 24 presses the push button of the micro switch 26 to turn on the micro switch 26, and an ON signal is input to the control unit.

The driver 14 and the forming plate 15
Forming Plate 1
The staple pusher 24 released from the pressing force of 5 moves forward, pushes both side legs of the formed staple S forward to feed the staple sheet 27, and the driver 14 and the forming plate 15 return to the home position. The driving operation of the cycle is completed and the next driving operation is ready.

That is, when the driving is normally performed, the staple pusher 24 moves backward and forward in conjunction with one cycle of the lowering and raising of the forming plate 15, and the state of the micro switch 26 changes from off to on and off. To do.

If the staples buckle in the passage of the driver 14 and become jammed, the forming plate 15
Since the staple sheet 27 cannot move forward during the ascending, the staple pusher 24 that has been retracted by the descending operation of the forming plate 15 does not move forward, and the ON state of the micro switch 26 continues at the end of the driving operation.

FIG. 3 shows a circuit block of the electric stapler 1, which includes a photo interrupter 23, a micro switch 26,
The staple sensor 28, the paper detection switch 29 that detects the insertion of the paper, and the home position sensor 3 described above.
0 is connected to the control unit 31. The control unit 31 controls the motor 6 and the display unit 32 based on the output state of each sensor and switch.

The home position sensor 30 is composed of a cam plate and a micro switch provided in the reduction gear mechanism, or a rotary light shield plate and a photo interrupter. The control unit 31 uses the output signal of the home position sensor 30 to
It is detected whether or not the first and second link arms 4 and 17 and the staple guide 5 are in the home position which is the upper standby position, and when the completion of the operation for one cycle is detected, the driving of the motor 6 is stopped.

The clock counter 33, which is the speed determining means of the driver 14, is set with a reference clock pulse number corresponding to an abnormality determining reference time slightly longer than the on / off cycle time of the photo interrupter 23 during normal operation of the driver 14. .

When the electric stapler 1 is activated, the link arms 4 and 17 and the staple guide 5 are lowered, and the driver 14 engaged with the first link arm 4 strikes the leading staple on the staple guide 5 on the paper. As well as
The forming plate 15 forms the staples in the rear row (as shown in FIG. 2B, the third row from the beginning in the electric stapler 1) in a gate shape.

The clock counter 33 starts counting clock pulses after the motor 6 is started, and is reset by the output pulse signal of the photo interrupter 23 before counting up the number of reference clock pulses during normal operation and restarts counting. Repeat the operation.

After the driver 14 presses against the paper on the clincher portion 11 and stops, the connecting plate 9 further compresses the compression coil spring 10 and descends to the bottom dead center before proceeding to the ascending stroke, and the driver 14 separates from the paper. And then rise. Then, the home position sensor 30 detects that the link arms 4 and 17 have reached the upper standby position, the motor 6 stops, and the one cycle of the spelling operation ends.

In the case where stapling failure occurs due to buckling of the staples, the speed of the driver 14 is extremely reduced by the reaction force of the staples immediately before the buckling of the staples,
After that, he buckles all at once. When the clock counter 33 counts up the number of reference clock pulses due to the decrease in the frequency of the output pulse of the photo interrupter 23 due to the decrease in the speed of the driver 14 at that time, the control unit 31 determines that the spelling is defective and the An error is displayed after the operation is completed.

At this time, if the micro switch 26 is returned to the off state, it is considered that the buckled staples are discharged together with the paper, and the spelling failure is displayed. Also,
If the staple remains in the driver's passage and the micro switch 26 continues to be in the ON state, staple jam is displayed.

The sensor for detecting the movement of the staple pusher 24 is not limited to the above-mentioned micro switch 26, and various sensors such as an optical sensor are applied within the technical scope of the present invention. Can be modified,
It goes without saying that the invention extends to these modifications.

[0030]

As described in detail above, when the stapler of the present invention buckles and is jammed in the driver guide, the stapler jam is displayed to prompt the user to remove the stapler. It is possible to deal with this, and it is possible to suppress a decrease in work efficiency due to a delay in finding an accident.

[Brief description of drawings]

FIG. 1 is a side view of an electric stapler of the present invention.

2A and 2B show a staple pusher portion of the electric stapler of FIG. 1, wherein FIG. 2A is a plan view and FIG. 2B is a side view.

3 is a circuit block diagram of the electric stapler of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric stapler 4 First link arm 5 Staple guide 13 Face plate 14 Driver 15 Forming plate 17 Second link arm 20 Slit plate 23 Photointerrupter 24 Staple pusher 25 Spring 26 Micro switch 27 Staple sheet 31 Control section 32 Display section

Claims (1)

[Claims] 1. An electric stapler using a staple sheet in which linear staples are adhered in parallel, and a forming plate (1) for forming staples into a gate shape.
5) A staple pusher (24) which moves backward and forward in conjunction with 5) and urges the staple toward the driver (14).
Is provided with a sensor (26) for detecting the forward and backward movement of the staple pusher (24), and a control unit for driving a display unit based on a detection signal of the sensor (26) is provided. An electric stapler configured to display staple clogging on the display when the pusher (24) is in the retracted position.