JP3533907B2 - Electric stapler table drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table driving apparatus for an electric stapler, and more particularly to a table driving apparatus for an electric stapler which is reduced in size. 2. Description of the Related Art An example of a conventional electric stapler table driving apparatus will be described with reference to FIG. In the figure, 1 is a frame,
A table 2 is mounted on a frame 1 so as to be freely slidable, and a guide pin 3 is fixed to the table 2. The guide pin 3 is inserted into a long hole 4 a of a distal end portion of a lever 4 pivotally attached to the frame 1, and the table 2 is connected to the lever 4. [0003] A central shaft 4b of the lever 4 is inserted into a vertically elongated hole 1a formed in the frame 1, and a compression coil spring 5 is interposed between the shaft 4b of the lever 4 and the bottom plate 1b of the frame 1, so that the entire lever 4 is provided. Is biased upward, and the roller 6 attached to the rear end of the lever 4 is pressed against the table driving cam 7. When the motor 8 drives the table driving cam 7 to rotate counterclockwise in the figure, the lever 4 rotates clockwise about the shaft 4b, and the tip of the lever 4 pushes the table 2 upward. The paper (not shown) inserted between the staple guide 9 and the table 2 is sandwiched between the staple guide 9 and the table 2, and the table driving cam 7 pushes down the rear part of the lever 4 to compress the compression coil spring 5. . The roller 6 of the lever 4 reaches the peak of the table drive cam 7 so that the drive load of the table drive cam 7 is maximized. Then, the driver 10 is driven downward by the driver drive mechanism to staple the paper. And the lever 4 receives the pressure of the driver 9 to further compress the compression coil spring 5. At the time of pressing the paper, a force obtained by dividing the spring force of the compression coil spring 5 by the lever ratio from the center shaft 4b of the lever 4 acts on the table 2 and the table driving cam 7,
The spring force is distributed between the table 2 and the table driving cam 7. Therefore, a compression coil spring having a large spring constant is required to counter the lifting force of the table 2 against the striking force of the driver, and the load on the motor is large. There is a problem in that the electric stapler is enlarged by occupying a corresponding space behind the mechanism, and the power consumption is large. Therefore, technical problems to be solved arise in order to reduce the size and power consumption of the electric stapler, and an object of the present invention is to solve the above problems. SUMMARY OF THE INVENTION The present invention proposes to achieve the above object, in which a table is mounted on a front portion of a table support lever, and a rear portion of the table support lever is provided on a stapler frame. , The table is opposed to the lower surface of the staple guide, the table support lever is reciprocated up and down by the motor and cam, the table is raised from the lower standby position, and the paper is pinched by the table and the staple guide. In a table driving device for an electric stapler, a cam (3
The drive shaft (14) to which 1) is attached is arranged at the front-rear intermediate position of the table support lever (15), and the link plate (32) is rotated back and forth on the frame above or below the intermediate position of the table support lever (15). Movably pivotally connected to the link plate with two connecting members (32c, 32c,
32d), one connecting member (32c) of the link plate is inserted into a guide groove (15c) formed in the front side surface of the table support lever (15) , and the other connecting member (32d) of the link plate is connected. Engage with the cam (31 ) to raise and lower the table support lever (15) via the link plate.
And a link table (32) and a table.
The axis of the support lever (15) and the link plate (32) are tapered.
Pulling the lever (15) in the direction to raise it
And a link plate.
The other connecting member (32d) of the table support lever
(15) Only engages with the cam during the up and down strokes.
At the time of pressing the paper, the other connecting member (32d)
The engagement of the cam (31) is released, and the tension coil spring (3) is released.
4) The paper is formed so as to squeeze the paper by the spring force, and
Guide groove (15c) of the table support lever (15)
By changing the tilt angle of the table,
ー (15) increased rapidly during the initial rise,
An object of the present invention is to provide a table driving device for an electric stapler, wherein the table driving device is configured to decelerate and ascend in a later-stage ascent stroke . An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an electric stapler 1
1, a drive shaft 14 is supported by a bearing 13 disposed slightly forward of the front and rear middle of the left and right frames 12, and a shaft of a table support lever 15 is provided behind the drive shaft 14. 15a is mounted, and a shaft 16a of the driver lever 16 is erected thereabove. A motor 17 is disposed 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 and protruding from the guide grooves 20 a on both right and left sides of the driver guide 20 are engaged with the grooves at the tip of the driver lever 16. The driver holder 21 is provided with a thin plate-like driver 23 for hitting staples and a forming plate 24 for forming linear staples in a gate shape, which are superimposed on each other, and the driver 23 and the forming plate 24 are connected to each other. The lever 16 is driven to move up and down along the driver guide 20. A table support lever 15 is disposed below the frame 12, and a table 25 is attached to a tip of the table support lever 15. As shown in FIG. 3, a clincher holder 26 is attached to a lower portion of the table 25, and a pair of right and left clinchers 27, which are rotation levers, are pivotally attached to the clincher holder 26. Below the intersection of the left and right clinchers 27, the table support lever 1
5 is located at the tip of a clincher arm 28 pivotally attached to the rear. When the driver 23 drives the staples on the paper on the table 25, the legs of the staples
, Into the clincher holder 26, and then the tip of the clincher arm 28 rises to rotate the left and right clinchers 27 upward, and the clincher 27
Folds 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 plurality of linear staples are bonded and connected in the staple cartridge 30. A staple sheet (not shown) is stored. At the bottom of the staple cartridge 30, a staple feed slider (not shown) is slidably mounted in the front-rear direction and urged forward by a spring. Since the staple feed mechanism using the staple feed slider has a known structure, it is not shown in the drawing.
The front slope of the staple feed slider projects into the path of the driver, and the staple feed slider is
Is pushed down by the driver when it descends, and the driver 2
When 3 rises, it moves forward. The staple feed slider is provided with a ratchet pawl, which slides on the lower surface of the staple sheet when retreating, and engages with a concave portion between staples when moving forward to feed the staple sheet forward. FIG. 4 shows a plan cross section of the electric stapler 11, in which a worm wheel 19 is fitted at the center of the drive shaft 14, and cams 31 are fitted near both right and left 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 the order from the left and right frames 12 to the inside. Guide rollers 33a of the clincher arm link plate 33 are engaged with cam grooves on both left and right sides of the worm wheel 19. The table support lever 15 and the driver lever 16 have their rear ends respectively connected to the shafts 15a. 16a
And the clincher arm 28 is pivotally attached to the rear of the table support lever 15. The worm wheel 19 and the left and right cams 31
The cam grooves are formed on both left and right sides, 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.
Are engaged with the cam groove 31a on the outer surface of the cam 31.
The cam 31 is driven to rotate counterclockwise in the figure, the driver lever 16 descends from the standby position shown in the figure, hits the staples by the front driver 23, and then rises to the standby position and stops. The operation of is performed. Next, the table driving device will be described. FIG.
Is the table support lever 15 and the table link plate 32
As shown in FIG. 3A, a hole 15b is formed in the front and rear middle side surface of the table support lever 15 to avoid interference with the drive shaft 14. As shown in FIG. On the front side surface, a guide groove 15c is formed which is inclined forward and backward and rises forward, and the guide groove 15c changes its inclination angle in two stages of a front part and a rear part, and the front part has a larger inclination angle than the rear part. Has become. The table link plate 32 shown in FIG. 2B has a shaft 32a at the lower end for pivotal connection to the frame, and a central slot 32b in the front-rear direction through which the drive shaft 14 passes.
Molding the, mounting the guide pin 32c to the front, mounting the guide roller 3 2 d at the rear, the spring locking pin 32 to the upper end
e is attached. [0022] (c) shows the inner surface of the cam 31 is a cam groove 31b of oval form, the guide rollers 3 2 d moves along the wall surface of the outer peripheral side of the cam groove 31b. FIGS. 7 to 10 show the operation of the table driving device. In order to facilitate understanding of the mechanical action, the cam 31, the table support lever 15, and the table link plate 32 are shown in an overlapping manner. As shown in FIG. 3, the cam 31 and the table support lever 1 move from the left and right ends of the drive shaft 14 toward the center.
5, the table link plate 32 is 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 and the cam 3
A rear guide roller 32b of the table link plate 32 is inserted into one cam groove 31b. Table link plate 32
The front guide pin 32c is inserted into the front guide groove 15c of the table support lever 15, and extends the tension coil spring 34 between the spring locking pin 32e at the upper end and the table support lever shaft 15a to move the table link plate 32 backward. The rear guide roller 32d is pressed against the rear wall surface of the cam groove 31b. When the cam 31 starts rotating one cycle counterclockwise from the initial position shown in FIG. 7, the table link plate 32 is pulled by the tension coil spring 34 and pivots rearward as shown in FIG. The guide pin 32c moves backward in the guide groove 15c of the table support lever 15. Guide groove 15c of table support lever 15
The table support lever 15 is pushed upward because the rear part is lowered, and the paper is pressed by the table 25 at the end and the driver guide 20 as shown in FIG. FIG. 7A shows a state when the number of sheets is extremely small, and FIG. 7B shows a state when the number of sheets is large. Table 25 and table support lever 15
When the table 25 at the end stops pressing when the paper is pressed against the paper, the cam 31 continues to rotate, the wall surface of the cam groove 31b is separated from the guide roller 32d of the table link plate 32,
The table support lever 15 clamps the paper by the spring force of a tension coil spring 34 acting via the table link plate 32. When the cam 31 rotates in the table descending stroke after passing the paper pressing 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 drive shaft 14 stops rotating when the table support lever 15 and the table 25 are lowered by rotating the table 32 forward and return to the initial position in FIG. As shown, the table support lever 15
Guide groove 15c is provided on the shaft 32a of the table link plate 32.
, The front guide pin 32c is inclined upward and forward with respect to the rotation locus of the front guide pin 32c, and the front portion has a larger inclination angle than the rear portion. Therefore, the table support lever 15
The guide pin 32c rapidly rises in the initial stroke in which it retreats in the front part of the guide groove 15c, decelerates from the middle part, 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 stroke when the rotational torque increases, and the paper is stably held. can do. The reaction force acting on the tension coil spring 34 from the driver 23 via the table support lever 15 at the time of staple driving is as follows.
Conversely, it is reduced. Accordingly, a sufficient paper compression performance can be obtained with a spring having a lower spring constant than the conventional type, and the driving load of the motor also decreases with a decrease in the spring constant, so that a smaller motor can be used, and the entire apparatus can be used. The size can be reduced. FIG. 11 shows another embodiment of the guide groove.
The inclination angle of the guide groove 15e of the table support lever 15 changes in three stages of the front part F, the middle part M, and the rear part R, and the inclination angle increases in the order of the middle part M, the rear part R, and the front part F. . Accordingly, the table support lever 15 rapidly rises during the initial stroke in which the guide pin 32 c retreats in the front portion F of the guide groove 15 e, decelerates at the intermediate portion M, and moves the table support lever 15 by the spring force of the tension coil spring 34. The ascending rotational torque is increased, and the rear portion R accelerates again slightly. As described above, by making the inclination angle of the front part and the rear part of the guide groove 15e larger than the inclination angle of the middle part, the elevating stroke is extended more than the table support lever 15 of FIG. , If you have a lot of paper,
The paper is pressed during the intermediate stroke in which the rotation torque is the maximum, so that the paper can be stably held regardless of the number of papers. Next, the clincher arm driving device will be described. FIG. 12 shows a clincher arm 28, a clincher arm link plate 33, and a cam plate 3 fixed to the table support lever 15, which are components of the clincher arm driving device.
The clincher arm 28 shown in FIG. 5A has a vertical guide groove 28a at the rear and a guide groove 28b inclined forward and backward at the front, and has a vertical The drive shaft 14 passes through the elongated hole 28c in the direction. The clincher arm link plate 3 shown in FIG.
A guide groove 33a in the front-rear direction through which the drive shaft 14 passes is formed in an intermediate portion of
3b is engaged with the cam groove on the side surface of the worm wheel 19. The guide pin 33c attached to the front part is inserted into the cam groove 35a of the cam plate 35 and the front guide groove 28b of the clincher arm 28 shown in (c). FIGS. 13 to 17 show the operation of the clincher arm driving device. As shown in FIG. 13, the rear guide groove 28a of the clincher arm 28 has a clincher arm support shaft mounted on the rear portion of the table support lever 15. 15d
Is inserted, and the rear portion of the clincher arm 28 is
The compression coil spring 36 is interposed between the bottom plate 28d at the lower rear end of the clincher arm 28 and the clincher arm support shaft 15d to urge the rear portion of the clincher arm 28 to the lower position. are doing. 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 formed by a cam groove on the side surface of the worm wheel 19. 19a. A front guide pin 33c of the clincher arm link plate 33 is provided with a cam groove 35a of a cam plate 35 fixed to a front portion of the table support lever 15,
It is inserted into the front guide groove 28b of the clincher arm 28. Front guide groove 28 of clincher arm 28
b is inclined forward and upward with respect to the cam groove 35a of the cam plate 35 fixed to the table support lever 15. Therefore, the guide pin 3 of the clincher arm link plate 33 inserted into the two grooves of the cam groove 35a and the front guide groove 28b
When 3c retreats from the front position of the cam groove 35a, the clincher arm 28 moves up with respect to the table support lever 15. The cam groove 35a of the cam plate 35, the Clean
The arm 28 is formed so as to substantially face the direction of the drive shaft 14 when the arm 28 rises and presses the paper, and is positioned between the maximum value and the minimum value of the number of spellable papers in the longitudinal center line of the cam groove 35a. The extension is set so as to pass through the axis of the drive shaft 14. Thus, regardless of the number of paper sheets, the direction of the tension reaction force of the clincher arm link plate 33 at the time of clinch is made substantially orthogonal to the axis of the drive shaft 14 to reduce the drive load. When the drive shaft 14 starts rotating one cycle in the counterclockwise direction from the initial position shown in FIG. 13, 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. 14, the clincher arm 28 is
5 and rises integrally with the table support lever 15 while being relatively stopped. 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 and penetrates 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 backward and the front guide pin 3
3c retracts in the cam groove 35a and the front guide groove 28b, so that the clincher arm 28 starts to rise. FIG. 16A shows a case where the number of papers is small and the table support lever 15 has risen to almost the uppermost position. FIG. 16B shows a case where the number of papers is large and the table support lever 15 has a large number of papers. FIG. 3 shows a state in which the support lever 15 is stopped in the middle of the elevating range. In either state, the clincher arm link plate 33 is pulled backward, and the tip of the clincher arm 27 is raised. The indicated clincher 27 is pushed up, and the clincher 27 flatly folds the staple legs inward. When the clincher 27 bends the staples and presses the staple 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 stopped.
Of the front guide pin 33c reaches the rear portion in the cam groove 35a and the front guide groove 28b, and at this time, FIGS.
As shown in the rear of the clincher arm 28 is pivoted upward direction compressing the compression coil spring 36 as a fulcrum tip is pressed against the lower surface of the clincher 27, the reaction force of the clincher 27 by the compression coil spring 36 Absorbing. Then, the rotation of the worm wheel 19 proceeds, and the clincher arm link plate 33 reverses the moving direction. As shown in FIG. 17, the front guide pin 33c moves between the cam 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. 13, the drive shaft 14 and the worm wheel 19 stop rotating and one cycle is completed. The present invention is not limited to the above embodiment, but various modifications are possible within the technical scope of the present invention, and it goes without saying that the present invention extends to those modifications. is there. As described above, in the table driving device of the electric stapler according to the present invention, the cam and the cam shaft of the table elevating mechanism are arranged at the front and rear intermediate portions of the table support lever, so that the height of the electric stapler is high. In addition, the front and rear length can be reduced. Further, the link plate which is driven back and forth by the cam and the guide groove formed in the table support lever are combined, and the table support lever is raised by the spring, so that the rotation torque of the table support lever is reduced by the deceleration action of the guide groove. As a result, the spring constant of the spring can be set lower than in the conventional type, and the driving load of the motor can be reduced. Therefore, it is possible to use a motor smaller than the conventional type, which is effective in reducing the size and power consumption.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention and is a side view of an electric stapler. FIG. 2 is a plan view of the electric stapler shown in FIG. 1; FIG. 3 is a front view of the electric stapler shown in FIG. 1; FIG. 4 is an enlarged plan sectional view of the electric stapler shown in FIG. 1; FIG. 5 is a side view illustrating a driver lever driving mechanism. FIG. 6A is a side view of a 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 driving device. FIG. 8 is an explanatory diagram of a stroke in which a cam of the table driving device is rotated by 45 °. 9A and 9B show a state where the cam of the table driving device is rotated by 90 °, FIG. 9A shows a case where the number of sheets is small, and FIG.
Is a process explanatory diagram showing a case where the number of sheets is large. FIG. 10 is a drawing explaining the stroke in which the cam of the table driving device is rotated by 270 °. FIG. 11 is a side view of a table support lever showing another embodiment of the guide groove. 12A is a side view of a clincher arm, and FIG.
FIG. 3 is a side view of a clincher arm link plate, and FIG. 3C is a side view of a cam plate fixed to a table support lever. FIG. 13 is an explanatory diagram of a standby state of the clincher arm driving device. FIG. 14 is an explanatory diagram of a stroke in which the cam of the clincher arm driving device is rotated by 90 °. FIG. 15 shows the cam of the clincher arm driving device at 190 °.
Diagram of the rotated process. FIG. 16 shows a cam of a clincher arm driving device of 230 °.
FIG. 7A is a process explanatory diagram showing a rotated state, FIG. 7A shows a case where the number of sheets is small, and FIG. FIG. 17 shows a 270 ° cam of the clincher arm driving device.
Diagram of the rotated process. FIG. 18 shows a conventional example, and is an explanatory diagram of a table driving device. [Description of Signs] 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 grooves 31b inner cam grooves 32 table link plates 32a shaft 32b long hole 32c front guide pin 32d rear guide rollers 32e spring engaging pin 33 clincher arm link plates 33a center guide groove 33b rear guide b over La 33c before Part guide pin 34 Tension coil spring 35 Cam plate 35a Cam groove 36 Compression coil spring

Claims (1)

(1) A table is attached to a front portion of a table support lever, a rear portion of the table support lever is pivotally mounted on a frame of a stapler, and the table is opposed to a lower surface of a staple guide. The table driving lever is reciprocated up and down by a motor and a cam, the table is raised from a lower standby position, and a table driving device of an electric stapler that holds a sheet by a table and a staple guide is provided. 31) with the drive shaft (1
4) is disposed at an intermediate position between the front and rear of the table support lever (15), and a link plate (32) is pivotally attached to the frame above or below the intermediate position of the table support lever (15) so as to be able to rotate back and forth. A link plate is provided with connecting members (32c, 32d) such as two pins or guide rollers, and guide grooves (15 ) formed on the front side surface of the table support lever (15).
Insert one connecting member (32c) of the link plate into c),
The other connecting member (32d) of the link plate is connected to the cam
(31) , the table support lever (15) is configured to move up and down via the link plate , and further, the link plate (32) and the table support lever (15)
Shaft, link plate (32) and table support lever (15)
Tension coil spring (34) for urging in the direction to raise
And the other connecting member (3) of the link plate.
2d) raising and lowering the table support lever (15)
Engage the cam only during the stroke,
Disengages the other connecting member (32d) with the cam (31).
Release the paper by the spring force of the tension coil spring (34).
And the table support lever.
-Change the inclination angle of the guide groove (15c) of (15)
As a result, the table support lever (15)
Rising rapidly during the last phase and decreasing during the last phase
A table driving device for an electric stapler, characterized in that the stapling speed is increased .