JP3533915B2 - Electric stapler clinch device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clinch device for an electric stapler, and more particularly to a clinch device for reducing the size of the electric stapler.

[0002]

2. Description of the Related Art There are various types of electric staplers, and there is known a flat clinch type electric stapler in which an elevating table is arranged directly under a driver and a rotary clincher is provided under the table. The table of this kind of electric stapler is attached to the tip end portion of the table support lever, and the rear end portion of the table support lever is attached to the shaft of the frame. A rotary clincher is mounted under the table, and a clincher arm that rotationally drives the clincher has a rear portion pivotally attached to a table support lever or a frame and a front portion located below the clincher. A drive mechanism such as a motor, a reduction gear, and a cam is disposed behind or above the table support lever and the clincher arm, and drives the table support lever, the driver, and the clincher arm up and down via the cam or the link with the cam.

When the paper is inserted between the table and the staple guide, the motor is activated by the output signal of the paper detection switch, and the front portion of the table support lever is raised to hold the paper by the table and the staple guide. Then, the driver descends and drives the staples into the paper, and the legs of the staples penetrate through the narrow grooves of the table to the bottom of the table. Then, the front part of the clincher arm rises, pushes up the clincher under the table and rotates it upward, and the clincher bends both legs of the staple inwardly and flatly.

[0004]

In recent years, composite type office equipment in which an electric stapler is built in a copying machine or the like is becoming widespread, and it is desirable that the electric stapler built in the copying machine be as small as possible. However, it is difficult to further reduce the size of a conventional electric stapler in which drive mechanisms such as a motor, a reduction gear, and a cam are arranged behind or above a table support lever or a clincher arm.

Therefore, there arises a technical problem to be solved in order to reduce the size of the electric stapler without sacrificing the performance as a stapler, and the present invention aims to solve the above problems. .

[0006]

[Means for Solving the Problems]
The present invention is proposed to achieve the above object, and a table support lever is attached to a frame of an electric stapler so as to be vertically rotatable,
A pair of left and right clinchers are rotatably attached to the lower part of the table for supporting the sheets to be bound, and the table is attached to the front part of the table support lever so as to face the lower surface of the driver, and to the rear part of the table support lever. The clincher arm is rotatably connected vertically, the tip of the clincher arm is located below the clincher, and the clincher arm is driven up and down together with the driver and the table support lever by the cam mechanism to rotate the clincher up and down. In a clincher device for an electric stapler in which a leg portion of a staple protruding below a table through a groove of a clincher is bent inward by a clincher, a clincher arm driving cam (19a) is provided to a clincher arm (28) and a table support lever (15). Place the clincher arm and table Each guide groove on the front side of the lifting lever (28b, 35a) and provided Rutotomoni guide grooves
(28b) tilts forward with respect to the guide groove (35a)
Is oblique, to engage the link (33) connecting member a pin or roller or the like on both ends of the (33b, 33c) said cam a rear portion of the connecting member (33b) provided (19a), a front portion of the connecting member ( 33c) through the clincher arm and the guide grooves (28b, 35a) of the table support lever to insert the cam (1
9a) to the clincher arm (28) and the table support lever
-(15) and link (33) to connect the cam
After the rotary motion of (19a), the clincher arm (2
Raise the table support lever (15) with respect to 8)
As described above, the present invention provides a clinch device for an electric stapler, which is configured to convert a rotary motion into a lifting motion of both .

Further, the connecting means of the table support lever and the clincher arm is constituted by a vertically elongated hole and a shaft, and the rear portion of the clincher arm is movable up and down within a certain range and is urged downward by a spring to clinch the clincher arm. A clinch device for an electric stapler configured to limit pressure by the spring.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 3 show an electric stapler 1
1, and as shown in the side view of FIG. 1, the drive shaft 14 is supported by the bearings 13 arranged slightly forward of the front and rear middles of the left and right frames 12, and the shaft of the table support lever 15 is provided behind the drive shaft 14. 15a is attached, and the shaft 16a of the driver lever 16 is installed above it. A motor 17 is arranged in front of the driver lever shaft 16a, and a worm gear 18 attached to the shaft of the motor 17 and a worm wheel 19 attached to the drive shaft 14 mesh with each other.

A driver guide 2 is provided at the front of the frame 12.
The guide pins 22 of the driver holder 21 inserted into the driver guide 20 with 0 mounted thereon project from the guide grooves 20a on the left and right side surfaces of the driver guide 20 and are engaged with the grooves at the tip of the driver lever 16.

A thin plate-shaped driver 23 for striking staples and a forming plate 24 for forming linear staples in a gate shape are attached to the driver holder 21 so as to overlap with each other in the front-rear direction. The driver 23 and the forming plate 24 are drivers. The lever 16 drives it up and down along the driver guide 20.

A table support lever 15 is arranged below the frame 12, and a table 25 is attached to the tip of the table support lever 15. As shown in FIG. 3, a clincher holder 26 is attached to the lower portion of the table 25, and a pair of left and right clincher 27, which are rotating levers, are pivotally attached to the clincher holder 26. Below the intersection of the left and right clincher 27, the table support lever 1
The front end of a clincher arm 28 pivotally attached to the rear of the vehicle 5 is located.

When the driver 23 drives the staples on the paper on the table 25, the legs of the staples are moved to the table 25.
Through the hole (not shown) in the clincher holder 26, and then the tip of the clincher arm 28 rises to rotate the left and right clincher 27 upwards.
Bend the left and right legs of the staple inward.

As shown in FIG. 1, a staple cartridge 30 is loaded in a cartridge chamber 29 between the driver guide 20 and the motor 17, and a roll in which a plurality of linear staples are bonded and connected in the staple cartridge 30. Stapling sheets (not shown) are stored. A staple feed slider (not shown) is slidably attached to the bottom of the staple cartridge 30 and is biased forward by a spring.

Since the staple feeding mechanism using the staple feeding slider has a known structure, illustration is omitted,
The front slope of the staple feeding slider projects into the driver's passage, and the staple feeding slider is
Is pushed down by the driver when it descends and moves backward,
When 3 rises, it moves forward. The staple feeding slider is provided with a ratchet pawl, which slides on the lower surface of the staple sheet at the time of retreating and engages with the concave portion between the staples at the time of advancing to feed the staple sheet forward.

FIG. 4 is a plan sectional view of the electric stapler 11, in which the worm wheel 19 is fitted in the center of the drive shaft 14 and the cams 31 are fitted in the vicinity of both left and right ends. As shown in the figure, the driver lever 16, the cam 31, the table support lever 15, the table link plate 32, the clincher arm 28, and the clincher arm link plate 33 are arranged symmetrically in this order from the left and right frames 12 in the center, The guide rollers 33b of the clincher arm link plate 33 are engaged with the cam grooves on the left and right side surfaces of the worm wheel 19.

The table support lever 15 and the driver lever 16 each have a rear end portion with the shaft 15a. 16a
Is pivoted to the rear of the frame 12 and the clincher arm 28 is pivoted to the rear of the table support lever 15.

The worm wheel 19 and the left and right cams 31
Has cam grooves formed on both left and right side surfaces, and the cam 31 drives the table support lever 15 and the driver lever 16, and the worm wheel 19 drives the clincher arm 28.

FIG. 5 shows a driving mechanism of the driver lever 16, and a guide roller 16b provided on the driver lever 16.
Engages with the cam groove 31 a on the outer surface of the cam 31.
The cam 31 is driven to rotate counterclockwise in the figure, and the driver lever 16 descends from the standby position shown in the figure, hits the staple with the driver 23 in the front part, and then rises to the standby position and stops. The operation of.

Next, the table drive device will be described. Figure 6
Is the table support lever 15 and the table link plate 32
The cam 31 is shown, and as shown in (a), a hole 15b for avoiding interference with the drive shaft 14 is formed in the side surface of the front and rear intermediate portion of the table support lever 15. A guide groove 15c is formed on the front side surface so as to be inclined forward and backward and upward. The guide groove 15c changes in inclination angle in two steps, namely, the front portion and the rear portion, and the inclination angle of the front portion is larger than that of the rear portion. Has become.

The table link plate 32 shown in (b) has a shaft 32a for pivotally attaching to the frame at the lower end and a longitudinal slot 32b in the front-rear direction through which the drive shaft 14 penetrates. . A guide pin 32c is attached to the front portion, a guide roller 32d is attached to the rear portion, and a spring locking pin 32e is provided on the upper end portion.

(C) shows the inner side surface of the cam 31, in which an elliptical cam groove 31b is formed, and the rear guide roller 3 of the table link plate 32 is provided along the wall surface on the outer peripheral side of the cam groove 31b.
2d moves.

FIGS. 7 to 10 show the operation of the table driving device, and in order to facilitate understanding of the mechanical operation, the cam 3 is shown.
1, the table support lever 15, and the table link plate 32 are shown in an overlapping manner, but as shown in FIG. 4, the cam 31, the table support lever 15, and the table 31 extend from the left and right ends of the drive shaft 14 toward the center. The link plates 32 are arranged in this order.

As shown in FIG. 7, the table link plate 32
The shaft 32a at the lower end of the cam 3 is inserted into the frame 12,
The rear guide roll 32 d of the table link plate 32 is inserted into the first cam groove 31 b. Table link board 32
The front guide pin 32c is inserted into the front guide groove 15c of the table support lever 15, and the tension coil spring 34 is hung between the spring locking pin 32e at the upper end and the table support lever shaft 15a to move the table link plate 32 rearward. The rear guide roller 32d is pressed against the rear wall surface of the cam groove 31b.

When the cam 31 starts to rotate counterclockwise for one cycle from the initial position shown in FIG. 7, the table link plate 32 is pulled by the tension coil spring 34 and rotated backward as shown in FIG. The guide pin 32c moves rearward in the guide groove 15c of the table support lever 15.

Guide groove 15c of the table support lever 15
Since the rear part has a shape that is lowered, the table support lever 15 is pushed upward, and as shown in FIG. 9, the table 25 at the leading end and the driver guide 20 press the paper. The figure (a) shows the state when the number of sheets of paper is extremely small, and the figure (b) shows the state when the number of sheets of paper is large.

Table 25 and table support lever 15
Stops ascending when the table 25 at the tip comes into pressure contact with the paper, the cam 31 continues to rotate, and the wall surface of the cam groove 31b separates from the guide roller 32d of the table link plate 32.
The table support lever 15 clamps the paper by the spring force of the tension coil spring 34 acting via the table link plate 32.

Then, when the cam 31 rotates past the paper compression stroke to the table lowering stroke, the wall surface of the cam groove 31b comes into contact with the guide roller 32d of the table link plate 32 again as shown in FIG. The table 32 is rotated forward to lower the table support lever 15 and the table 25, and when the drive shaft 14 is returned to the initial position in FIG. 7, the drive shaft 14 stops rotating.

As shown, the table support lever 15
Guide groove 15c of the shaft 32a of the table link plate 32
The inclination angle of the front portion is larger than that of the rear portion with respect to the rotation locus of the front guide pin 32c centering on. Therefore, the table support lever 15 is
In the initial stroke in which the guide pin 32c retracts in the front portion of the guide groove 15c, the guide pin 32c rapidly rises, decelerates from the intermediate portion, and the rising rotational torque of the table support lever 15 due to the spring force of the tension coil spring 34 increases.

As described above, by making the inclination angle of the front portion of the guide groove 15c larger than the inclination angle of the rear portion, the paper is pressed in the latter half of the process in which the rotational torque increases, and the paper is stably sandwiched. can do. Further, the reaction force acting on the tension coil spring 34 from the driver 23 via the table support lever 15 at the time of driving the staple is
On the contrary, it is reduced. Therefore, a spring with a lower spring constant than the conventional type can provide sufficient paper compression performance, and as the spring constant decreases, the drive load of the motor also decreases, making it possible to use a smaller motor and reduce the entire device. It can be miniaturized.

Next, the clinch device of the present invention will be described.
FIG. 11 shows a clincher arm 28, which is a component of the clinching device, a clincher arm link plate 33, and a cam plate 35 fixed to the table support lever 15, (a).
The clincher arm 28 shown in FIG. 6 has a vertical guide groove 28a at the rear part and a guide groove 28b inclined at the front part in the front-rear direction and at the front, and drives a vertical slot 28c provided in the front-rear intermediate part. The shaft 14 penetrates.

Clincher arm link plate 3 shown in (b)
A guide groove 33a in the front-rear direction that penetrates the drive shaft 14 is formed in the middle portion of the guide roller 3
3b engages with a cam groove on the side surface of the worm wheel 19. The guide pin 33c attached to the front portion is provided with the guide groove 35a of the cam plate 35 shown in FIG.
Is inserted into the front guide groove 28b.

12 to 16 show the operation of the clincher device. As shown in FIG. 12, a clincher arm support shaft 15d axially attached to the rear portion of the table support lever 15 is provided in the rear guide groove 28a of the clincher arm 28. Inserted,
The rear portion of the clincher arm 28 is movable up and down within the range of the guide groove 28a. However, the bottom plate portion 28d at the lower rear end of the clincher arm 28 and the clincher arm support shaft 15d are provided with the compression coil spring 36, so that the clincher arm 28 can be moved.
The rear part is biased to the lowered position.

The drive shaft 14 passes through the elongated hole 28c of the clincher arm 28 and the intermediate guide groove 33a of the clincher arm link plate 33, and the rear guide roller 33b of the clincher arm link plate 33 is provided on the side surface of the worm wheel 19. 19a is engaged. The front guide pin 33c of the clincher arm link plate 33 has a guide groove 35a of a cam plate 35 fixed to the front portion of the table support lever 15.
And a front guide groove 28b of the clincher arm 28.

Front guide groove 28 of the clincher arm 28
The point b is inclined forward and upward with respect to the guide groove 35a of the cam plate 35 fixed to the table support lever 15. Therefore, when the guide pin 33c of the clincher arm link plate 33 inserted into the two grooves of the guide groove 35a and the front guide groove 28b is retracted from the front position of the guide groove 35a, the clincher arm is moved relative to the table support lever 15. 28 rises.

The guide groove 35a of the cam plate 35 is formed so as to face substantially the direction of the drive shaft 14 when the table support lever shaft 15a rises and presses the paper. Guide groove 35a in the middle of the minimum value
The extension line of the longitudinal center line of the drive shaft 14 is set so as to pass through the axis of the drive shaft 14. Thus, regardless of the number of sheets of paper, the direction of the pulling reaction force of the clincher arm link plate 33 at the time of clinching is made substantially orthogonal to the axis of the drive shaft 14 to reduce the drive load.

When the drive shaft 14 starts rotating counterclockwise for one cycle from the initial position shown in FIG. 12, the table support lever 15 rises as described above, but due to the shape of the cam groove 19a of the worm wheel 19, As shown in FIG. 13, the clincher arm 28 is used for the table support lever 1.
While being relatively stopped with respect to 5, the table support lever 15 is lifted together with the table support lever 15.

After the table support lever 15 presses the paper against the lower surface of the driver guide 20 and the staple is struck by the driver to penetrate the paper, the clincher arm link is formed by the cam groove 19a of the worm wheel 19 as shown in FIG. The plate 33 is pulled rearward, and the front guide pin 3
The clincher arm 28 starts to rise as the 3c retracts in the guide groove 35a and the front guide groove 28b.

FIG. 15A shows the case where the number of sheets of paper is small, and the table support lever 15 is raised to the almost uppermost position. FIG. 15B shows the case where the number of sheets of paper is large. Although the state where the support lever 15 is stopped in the middle of the ascending / descending range is shown, the clincher arm link plate 33 is pulled rearward and the tip of the clincher arm 27 rises in any state, as shown in FIG. The clincher 27 shown is pushed up and the clincher 27 folds the legs of the staple flat inwards.

When the clincher 27 bends the staples and presses it against the lower surface of the paper, the clincher arm 28 is prevented from rising and stops, but the clincher arm link plate 33 is used.
Front guide pin 33c reaches the rear of the guide groove 35a and the front guide groove 28b, and at this time, as shown in FIG.
As shown in (b), the rear part of the clincher arm 28 is
Rotates upward direction compressing the compression coil spring 36 a tip in pressure contact with the lower surface of the clincher 27 as a fulcrum, and absorbs the reaction force of the clincher 27 by the compression coil spring 36.

Then, as the worm wheel 19 rotates, the clincher arm link plate 33 reverses its moving direction, and as shown in FIG. 16, the front guide pin 33c moves in the guide groove 35a and the front guide groove 28b. When the clincher arm 28 moves forward and descends and returns to the standby position shown in FIG. 12, the drive shaft 14 and the worm wheel 19 stop rotating to complete one cycle.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope of the present invention, and it goes without saying that the present invention extends to those modifications. is there.

[0042]

As described above, in the clinching device for the electric stapler of the present invention, the cam and the cam shaft of the clincher drive mechanism are arranged at the front and rear intermediate portions of the clincher arm and the table support lever. In addition, the front-rear length can be shortened.

Further, since the clincher arm is moved up and down by the combination of the link plate that is reciprocally driven by the cam and the guide groove that serves as the cam, the ratio of the rotational torque of the clincher arm to the rotational torque of the motor is reduced by the deceleration action of the guide groove. It is possible to use a motor smaller than the conventional type, which is effective for downsizing and power consumption reduction.

[Brief description of drawings]

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

FIG. 2 is a plan view of the electric stapler shown in FIG.

3 is a front view of the electric stapler shown in FIG. 1. FIG.

FIG. 4 is an enlarged plan sectional view of the electric stapler shown in FIG.

FIG. 5 is a side view of a driver lever drive mechanism.

FIG. 6A is a side view of the table support lever, and FIG.
Is a side view of the table link plate, and (c) is an inner side view of the cam.

FIG. 7 is an explanatory diagram of a standby state of the table drive device.

FIG. 8 is a stroke explanatory diagram in which the cam of the table drive device rotates by 45 °.

FIG. 9 shows a state where the cam of the table drive device has rotated 90 °, (a) shows a case where the number of sheets is small, and (b).
FIG. 4 is a process explanatory diagram showing a case where the number of sheets of paper is large.

FIG. 10 is a stroke explanatory diagram in which the cam of the table drive device rotates by 270 °.

11A is a side view of a clincher arm, FIG.
[Fig. 6] is a side view of a clincher arm link plate, and (c) is a side view of a cam plate fixed to a table support lever.

FIG. 12 is an explanatory diagram of a standby state of the clinch device.

FIG. 13 is a stroke explanatory view in which the cam of the clinch device is rotated by 90 °.

FIG. 14 is a stroke explanatory diagram in which the cam of the clinch device is rotated by 190 °.

FIG. 15 shows a state in which the cam of the clinch device is rotated by 230 °, (a) shows a case where the number of sheets is small, and (b).
Is a process explanation diagram showing a case where there are many sheets of paper.

FIG. 16 is a stroke explanatory diagram in which the cam of the clinch device rotates by 270 °.

[Explanation of symbols]

11 electric stapler 12 frame 14 drive shaft 15 table support lever 15a shaft 15b hole 15c guide groove 15d clincher arm support shaft 16 driver lever 17 motor 19 worm wheel 19a cam groove 25 table 27 clincher 28 clincher arm 30 staple cartridge 31 cam 31a outer cam Groove 31b Inner cam groove 32 Table link plate 32a Shaft 32b Slot 32c Front guide pin 32d Rear guide roller
32e spring locking pin 33 clincher arm link plates 33a center guide groove 33b rear guide B over La 33c front guide pin 34 tension coil spring 35 the cam plate 35a guide groove 36 a compression coil spring

Claims (2)

(57) [Claims] 1. A table supporting lever is rotatably attached to a frame of an electric stapler, and a pair of left and right clinchers is rotatably attached to a lower portion of a table for supporting sheets to be bound, and the table is supported by the table. The clincher arm is attached to the front part of the lever so as to face the lower surface of the driver, the clincher arm is connected to the rear part of the table support lever so as to be vertically rotatable, and the tip of the clincher arm is positioned below the clincher, and the cam mechanism drives the driver. In the clincher device of the electric stapler, the clincher arm is driven up and down together with the table support lever to rotate the clincher up and down, and the legs of the staple protruding below the table through the groove of the table are bent inward by the clincher. The cam (19a) for driving the arm is aligned with the clincher arm (28). And the guide groove (28b, 35) on the front side surface of the clincher arm and the table support lever, respectively.
a) is provided, and connecting members (33b, 33c) such as pins or rollers are provided at both ends of the link (33) so that the rear connecting member (33b) is engaged with the cam (19a) to connect the front portion. The member (33c) is inserted into the clincher arm and the guide grooves (28b, 35a) of the table support lever, and the cam (19a) and the clincher arm (28) are linked (3).
3) and the guide groove (28) based on the rotation of the cam (19a).
b, 35a), the connecting members (33a, 33c),
The relative movement with the link (33) causes the guide groove (2
8b, 35a), a relative inclination angle difference is generated, and according to the configuration, the rotational movement of the cam (19a) is converted into the lifting movement of the clincher arm (28). Clinch device for electric stapler. 2. The clincher arm (28) and the table support lever (15) are connected to each other by a vertically elongated hole (28a) and a shaft (15d) so that the rear portion of the clincher arm can be raised and lowered within a certain range. The clinch device for an electric stapler according to claim 1, wherein the clinch device is urged downward by a spring (36) to limit the clinching pressure of the clincher arm by the spring.