JPH0631651A - Up/down turn driving mechanism for magazine in electrically-driven stapler - Google Patents

Abstract

PURPOSE:To stabilize returning a drive link and to provide miniaturization thereof by arranging the drive link in magazine both ends connected to a magazine in front/rear ends, and also providing a cam roller in a roller shaft provided in a rear end of the drive link, so as to turn upward/downward the magazine associated with a motor driving eccentric cam. CONSTITUTION:When an electric motor is actuated, an eccentric cam 10 is rotated through a gear mechanism. Accordingly, a relative relation to a cam roller 18 is changed, and a peripheral surface of the eccentric cam 10 comes into contact with and separates from a peripheral surface of the cam roller 18. That is, when the eccentric cam 10 presses the cam roller 18 by both thereof into contact, the cam roller 18 is extruded so as to move distant, and a magazine 2 is turned downward. When the cam roller 18 is released with turning the eccentric cam 10, the cam roller 18 is returned to the former state by force of a cam cover and the magazine 2 is turned upward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive mechanism for vertically rotating a magazine in an electric stapler.

[0002]

2. Description of the Related Art A vertical rotation driving mechanism for a magazine of this type is conventionally provided with grooved cams operatively connected to an electric motor on both sides of a base frame, and correspondingly, an intermediate portion is provided on the base frame. There is known a structure in which one end of a pair of supported drive links is engaged with each groove cam and the other end is connected to the front end of a magazine supported coaxially with the drive link. In this, the grooved cam is rotated by an electric motor, so that the drive link is rotationally driven along the shape of the grooved cam. In such a drive mechanism, the grooved cams on both sides must be rotated completely integrally to cause a phase difference, and the drive links on both sides move up and down without synchronization, so that the magazine cannot be moved up and down correctly. Poor spelling may occur. Further, since the groove cam has to be made large, there is also a drawback that the entire apparatus becomes large.

Therefore, the inventors of the present invention arranged an eccentric cam on the center line of a pair of drive links and a magazine, arranged a cam roller in the middle of the pair of drive links, and rotated the eccentric cam to rotate the outer peripheral surface of the cam roller. We considered a mechanism that drives the drive link by pushing and pushing. in this case,
The mechanism for returning the drive link becomes a problem, and one possible solution is to pull the front end of the drive link upward with a tension spring.

However, since various parts are directly and indirectly linked to the drive link, when the drive link is actuated to return, other parts are also slid in relation to this, and between these parts. Since a relatively strong sliding resistance is exerted on the drive link, the drive link cannot be reliably returned unless the spring force of the tension spring is strong. However, on the other hand, if the spring force is increased, the output of the electric motor must be increased.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drive link drive mechanism for an electric stapler that can solve the above problems and realize a particularly stable return of the drive link, and also can downsize the entire apparatus. Is its purpose.

[0006]

In order to achieve the above object, a vertical rotation driving mechanism of a magazine in an electric stapler according to the present invention is provided with a magazine rotatably in a vertical direction on a base frame having a binding table. , When the magazine is rotated downward by an electric motor, the staples in the magazine are ejected toward the stapling table, and the staples are pierced by the material to be bound on the stapling table to be stapled. Drive links are arranged, a pair of drive links are integrally connected at the rear end, and each rear part of the drive link and magazine is rotatably supported on the base frame, and the front end of the drive link is set at the front end of the magazine. A cam roller is rotatably supported by a roller shaft that connects the rear parts of the drive links on both sides, and the roller is mounted on the base frame. A drive gear operatively connected to the electric motor and an eccentric cam are respectively fixed to a drive shaft provided in parallel with the eccentric cam and the cam roller are arranged side by side, and a cam cover is provided around the eccentric cam and the cam roller. It is characterized by being covered and connected.

[0007]

In the above structure, when the electric motor is operated, its output is transmitted from the intermediate gear to the drive gear to rotate the drive shaft, so that the eccentric cam rotates.
Along with this, when the eccentric cam rotates and its outer peripheral surface presses the outer peripheral surface of the cam roller, the cam roller is pushed away from the drive shaft of the eccentric cam to rotate the magazine downward, and the outer peripheral surface of the eccentric cam is rotated. When the surface tries to move away from the outer peripheral surface of the cam roller, the cam cover pulls the cam roller back toward the drive shaft, so that the magazine is driven to rotate upward.
The drive link will definitely return.

As described above, since the drive link reciprocates about the support shaft, the front end of the magazine connected to the front end of the drive link is also rotated about the support shaft in the vertical direction. Also,
Since the drive link is driven by a simple structure in which the eccentric cam and the cam roller are covered with the cam cover, the entire apparatus can be downsized. Further, since the eccentric cam and the cam roller are arranged on the central axis of the drive links on both sides, the drive links are always driven in synchronization. Furthermore, since the return of the drive link is performed by the cam cover, it is not necessary to consider the strength of the spring as in the case of a spring, and a stable return can be realized.

[0009]

1 and 2 show an electric stapler. This electric stapler uses sheet-shaped staples in which straight staples are connected in a sheet shape, and the magazine 2 on the base frame 1 is vertically rotated by an electric motor 3 and is attached to the magazine 2 when vertically rotated. The sheet-shaped staples are fed forward from 4 and the sheet-shaped staples are formed into U-shapes in order from the staples at the tips and then punched out toward the binding table 5 at the front end of the base frame 1, and the legs of the staples are placed on the binding table 5. The material to be bound 6 is passed through and bound. Therefore, the electric stapler is provided with a drive mechanism for rotating the magazine 2 in the vertical direction, a forming / ejecting mechanism for forming and ejecting the staples in the magazine 2, and a feeding device for ejecting the sheet-like staples in the magazine 2 forward. And a mechanism are provided. Hereinafter, these mechanisms will be sequentially described.

First, the vertical rotation drive mechanism of the magazine 2 will be described. As shown in FIGS. 1, 2 and 5, standing pieces 1a and 1b are formed on both sides of the central portion of the base frame 1 and on one side of the rear portion, respectively. The rear standing piece 1b is provided with an electric motor 3 and an intermediate gear 7 linked to the output shaft thereof, and a drive shaft 8 is passed through the upper portion of the central standing piece 1a. The intermediate gear 7 is an end of the drive shaft 8. It meshes with a drive gear 9 fixed to the section. An eccentric cam 10 fixed to the central portion of the drive shaft 8 is arranged between the central portion standing pieces 1a on both sides, and a magazine 2 and a pair of drive links 11 arranged on both sides of the magazine 2. Is provided. Then, the rear end of the magazine 2 and the pair of drive links 1
A support shaft 15 penetrates through the shaft holes 12 and 13 at the lower rear end of 1 and the lower shaft hole 14 of the central portion standing piece 1a to rotatably support the magazine 2 and the drive link 11. A roller shaft 17 penetrates through a long hole 16 formed in the upper part of the rear portion of the drive link 11, and a cam roller 18 is rotatably supported by the roller shaft 17. The cam roller 18 is arranged in parallel with the eccentric cam 10, the cam rollers 18 and the outer circumferences of the eccentric cam 10 are covered with a cam cover 19, and the cam roller 18 and the eccentric cam 10 are connected by the cam cover 19. It should be noted that the roller shaft 17 is always provided with the elongated spring 1 by the tension spring 20.
6 is urged to engage the rear end.

Next, the front ends of both drive links 11 are connected by a connecting shaft 21 (see FIG. 1), and
The connecting shaft 21 penetrates a projecting piece 34 on the front surface of a driver, which will be described later, arranged in the front portion of the magazine 2. The lower surface of the front end of the magazine 2 contacts the binding table 5 of the base frame 1 and the protrusion 2 formed laterally from the lower end of the magazine 2.
The rotation range of the magazine 2 is up to the position where 2 is engaged with the curved arm 23 formed on the base frame 1. The driver is configured to move up and down relatively to the magazine 2, so that the drive link 11 is set larger than the stroke of the magazine 2. Further, the rear ends of the drive links 11 on both sides are connected by a connecting wall 11a (see FIG. 5).

It should be noted that the drive link 11 does not necessarily have to be directly connected to the driver. For example, it may be configured to be connected to a holding member (not shown) that holds the driver.

In the above structure, when the electric motor 3 is operated, its output is transmitted from the intermediate gear 7 to the drive gear 9 to rotate the drive shaft 8, so that the eccentric cam 10 rotates. Accordingly, when the eccentric cam 10 rotates from the state shown in FIG. 3 to press the outer peripheral surface of the cam roller 18 as shown in FIG. 4, the cam roller 18 is moved away from the drive shaft 8 of the eccentric cam 10. When the outer peripheral surface of the eccentric cam 10 tries to move away from the outer peripheral surface of the cam roller 18 from the state of FIG. 4 as shown in FIG. 4 while pushing out to rotate the magazine 2 downward, the cam cover 19 causes the cam roller 18 to move the cam roller 18. The magazine 2 is driven so as to rotate upward, so that the drive link 11 surely returns.

Since the drive link 11 reciprocally rotates about the support shaft 15 as described above, the front end of the magazine 2 connected to the front end of the drive link 11 also rotates about the support shaft 15 in the vertical direction. Further, the drive link 11 is driven by a simple structure in which the eccentric cam 10 and the cam roller 18 are covered with the cam cover 19, so that the entire apparatus can be downsized. Further, since the eccentric cam 10 and the cam roller 18 are arranged on the central axis of the drive links 11 on both sides,
The drive link 11 is always driven in synchronization.
Furthermore, since the return of the drive link 11 is performed by the cam cover 19, it is not necessary to consider the strength of the spring as in the case of a spring, and a stable return can be realized.

Next, the structure of the magazine 2 and the staple forming / stamping-out mechanism will be described. As shown in FIGS. 5 to 7, the magazine 2 has a staple cartridge 4 at the center of a magazine body 2a having front and rear side walls. The attachment part 25 is formed, and the staple is formed in front of it.
The punching portion 26 is formed, and the rear portion of the magazine body 2a has the central standing piece 1a of the base frame 1 as described above.
It is rotatably supported by a support shaft 15 penetrating therethrough.

As shown in FIG. 7, the staple cartridge 4 accommodates the sheet-like staples 27 in multiple stages, and a supporting protrusion 28 for supporting the lower surface of the lowermost sheet-like staple 27a is formed on the inner surface of the lower end of the side wall. The bottom and the lower ends of the front and rear walls are open. Further, on the inner surfaces of both side walls of the magazine main body 2a, there are formed guide projection walls 29 for supporting and guiding the lower surfaces of both side ends of the sheet-like staple drawn out from the lower end of the front wall. Further, as shown in FIG. 3, the bottom wall of the attachment portion 25 of the staple cartridge 4 is opened, and a feeding mechanism (described later) for feeding the staples stored in the staple cartridge 4 forward along the guide projection wall 29 is arranged. It is set up.

Next, a guide plate 30 is fixed to the front part of the magazine 2 as shown in FIG. 6, and a face plate 33 is arranged on the front part of the magazine 2 via a forming plate 31 and a driver 32. The projecting pieces 34 and 35 are formed in a bent shape at the front and rear of the driver 32, the rear projecting piece 35 penetrates the opening of the forming plate 31, and the front projecting piece 34 penetrates the vertical slit 36 of the face plate 33 to the front thereof. And is penetrated by the connecting shaft 21 that connects to the front end of the drive link 11 as described above. As shown in FIGS. 6 and 8, an anvil 37 is continuously arranged at the front end of the guide projection wall 29, and is fed between the anvil 37 and the lower surface of the guide plate 30 by the feeding mechanism. A passing gap for the sheet-shaped staples 27a is formed, and a front end (formed) staple receiving portion 38 is formed on the back surface of the face plate 33. The driver 32 faces the receiving portion 38, and the forming plate is formed. The reference numeral 31 is arranged so as to face the anvil 37 fixed to the front end of the guide wall 29.

With the above structure, when the drive link 11 is driven in the vertical direction, the driver 32 also moves up and down.
Since the magazine 2 follows this due to the frictional resistance with its surroundings, the magazine 2 also rotates in the vertical direction. As shown in FIG. 4, when the magazine 2 also moves downward with the downward movement of the driver 32, the lower surface of the front end of the magazine 2 comes into contact with the upper surface of the material 6 to be stopped and the driving link 11 and the driver 32 are further moved. The downward movement continues, and the staple 39 at the front end supplied to the receiving portion 38 on the back surface of the face plate 33 as shown in FIG.
(Formed) is ejected from the lower surface of the front end of the magazine 2 toward the binding table 5, and the leg portions of the staples are pierced through the material 6 to be bound on the binding table 5 as shown in FIG. Further, the forming plate 31 is driven together with the driver 32,
As shown in FIG. 3B, the straight staples 39b on the anvil 37 are pressed down on both sides by the forming plate 31 and formed into a U-shape. When the driver 32 is driven upward, the formed staple is supplied to the face plate 33, and the next straight staple is supplied onto the anvil 37. By repeating the above, the sheet-shaped staple 27a is formed and driven.

Next, the feeding mechanism for feeding the staples in the staple cartridge 4 forward is, as shown in FIG. 3, a first feeding device a arranged at the rear part of the staple cartridge 4 and a second feeding device a arranged at the front part. It is composed of a feeding device b.

The first feeding device a pushes out the rear end of the sheet-like staple 27a at the lowermost stage when the magazine 2 is rotated, and pulls it out forward from the front wall of the staple cartridge 4, and the base frame shown in FIG. 1. A supporting rod 41 formed obliquely upward on the bearing portion 40 of the support shaft 15 of the magazine 2 at the center of 1 and a feed member 42 (see FIG. 6) slidably arranged in the magazine 2 in the front-rear direction. It is composed by. The feed member 42 is formed by forming an inverted L-shaped piece 42b on the upper portion of the plate portion 42a, and openings 43, 44 are formed in the upper end of the inverted L-shaped piece 42b and the plate portion 42a. The reference numeral 44 is fitted into the support rod 41. Further, vertical projections 45 and 46 are formed on both side edges of the plate portion 42a, and a guide projection wall 29 is engaged with the inner surface of the side wall of the magazine 2 between the vertical projections 45 and 46. Thus, the plate portion 42a of the feed member 42 is slidably engaged in the feed direction of the magazine 2. Therefore, the feeding member 42 always has the same inclination as the magazine 2 and is held so as to slide in the feeding direction of the sheet-shaped staple 27. Further, an abutting portion 47 is formed on the upper portion of the plate portion 42a and has a stepped shape with a thickness corresponding to one sheet-shaped staple 27. The feed member 42 is urged by a tension spring 48 so as to always move forward.

According to the first feeding device a, when the front end of the magazine 2 is at the upper position as shown in FIG. 10 (a),
The feeding member 42 is also inclined at the same angle as the inclination angle of the magazine 2, and the tip end of the feeding member 42 is in the most inside of the staple cartridge 4 by the tension spring 48. From this state, when the magazine 2 is rotated downward by the rotation driving mechanism of the magazine 2, the feeding member 42 is also compulsorily rotated as shown in FIG. Since the upper end opening portion 43 of the feed rod 42 engages with the support rod 41, the feed member 42 rotates about this engaging portion. Since the rotation center of the magazine 2 (the support shaft 15) and the rotation center of the feed member 42 are different from each other, the feed member 42 moves so as to relatively retract from the magazine 2 in accordance with the rotation of the magazine 2. Then, the tension spring 48 extends. When the front end of the magazine 2 is rotated upward again, the support rod 41 disengages the feed member 42 from the upper end opening 43 of the inverted L-shaped piece 42b.
2 moves forward relative to the magazine 2 by the spring force of the tension spring 48, so that the plate 4
The contact portion 47 of the sheet 2a engages with the rear end surface of the sheet-like staple 27a at the lowermost stage in the staple cartridge 4 and moves the sheet-like staple 27a forward as it is, so as shown in FIG. The staple 27a is guided out of the lower end opening of the front wall of the staple cartridge 4 by the guide projection wall 29 on the inner surface of the side wall of the magazine 2, and is sent out by the distance that the contact portion 47 enters the staple cartridge 4.

As shown in FIGS. 2 and 3, the second feeding device b is fixed to the feed roller 50 disposed facing the opening at the bottom of the magazine body 2a and the end of the roller shaft 51 thereof, and fixed to the magazine. The ratchet 52 arranged outside one of the front walls of the main body 2a, and the drive link 1 above the ratchet 52.
1 and an inverted U-shaped ratchet lever 53 which is swingably arranged. Ratchet lever 53
Forms the front lever portion 53a and the rear lever portion 53b in an inverted U shape by an elastic member such as a synthetic resin,
An inverted L-shaped piece 53c (see FIG. 5) is formed laterally from the uppermost portion, and the inverted L-shaped piece 53c is locked to one drive link 11. One push claw 54 at the tip of the front lever
However, at the tip of the rear lever portion 53b, two pulling claws 55,
56 are formed respectively. And both claws 54, 5
The space between 5 and 56 is formed to be smaller than the outer diameter of the ratchet 52. Also, both claws 54, 55.5
6 is located above the ratchet 52 when the drive link 11 is relatively above the magazine 2 and is engaged with the ratchet 52 when the drive link 11 is moved relatively below the magazine 2. It is formed to fit.

According to the second feeding device b, as shown in FIG.
When the drive link 11 is driven downward as shown in (a) and the magazine 2 is also rotated downward, the lower surface of the front end of the magazine 2 comes into contact with the upper surface of the material 6 to be bound and does not move further downward.
On the other hand, since the drive link 11 is driven further downward, the push claw 54 of the ratchet lever 53 is
The ratchet 52 is rotated forward by engaging with the front claw tooth of No. 2 and pushing it down. Then, after the staples at the front end that have already been supplied are ejected by the driver, the magazine 2 is also rotated upward as the drive link 11 is driven upward. In the magazine 2, the protrusion 22 engages with the curved arm 23 and stops ascending while the drive link 11 is driven further upward, so that the ratchet lever is in the middle as shown in FIG. 53 two pulling claws 5
5, 56 continue to engage the pawl teeth on the rear side of the ratchet 52 and pull it up to rotate the ratchet 52 forward. In this way, since the ratchet 52 is rotated when the magazine 2 moves up and down, the feed roller 50 is driven so as to rotate forward. Therefore, the sheet-shaped staples 2 abutted on the feeding roller 50 by the first feeding device.
7a is fed forward by the frictional resistance when the feed roller 50 rotates.

As described above, when the front end of the sheet-shaped staple 27a in the staple cartridge 4 is drawn forward by the first feeding device in response to the vertical movement of the magazine 2, the lower surface of the front portion of the sheet-shaped staple 27 is moved to the first position. It comes into contact with the feed roller 50 of the second feeding device and is further fed forward by the second feeding device. Therefore, the lowermost sheet-like staple 27a in the staple cartridge 4 is
Is fed forward from the rear by the first feeding device and forward from the front by the second feeding device, so that reliable feeding is performed even if the intermediate portion is broken, for example.

[Brief description of drawings]

FIG. 1 is a perspective view of an entire electric stapler according to the present invention.

FIG. 2 is a side view of the electric stapler.

FIG. 3 is a vertical cross-sectional view of a main part of the electric stapler.

FIG. 4 is an explanatory diagram of an operation mode of a rotation drive mechanism of a magazine.

FIG. 5 is an exploded perspective view of a magazine, a drive link, and a base frame.

FIG. 6 is an exploded perspective view of a magazine.

FIG. 7 is a perspective view of a main part of a staple cartridge.

FIG. 8 is a cross-sectional view of a main part of a molding / punching part of a magazine.

9 (a) and 9 (b) are explanatory views of a staple forming and ejecting mode in a forming / embossing portion of a magazine, respectively.

10 (a), (b), and (c) are explanatory views of an operation mode of the first feeding device.

11 (a) and 11 (b) are explanatory views of operation modes of the second feeding device.

[Explanation of symbols]

 1 base frame 2 magazine 3 electric motor 5 binding table 6 material to be bound 8 drive shaft 9 drive gear 10 eccentric cam 11 drive link 17 roller shaft 18 cam roller 19 cam cover

Claims (1)

[Claims] 1. A magazine is rotatably provided in a vertical direction on a base frame having a binding table, and when the magazine is rotated downward by an electric motor, staples in the magazine are ejected toward the binding table. In an electric stapler in which staples are pierced through the material to be bound on the stapling table for binding, a pair of drive links is arranged on both sides of the magazine, and the pair of drive links are integrally connected at the rear end, and each of the drive link and the magazine is connected. The rear part is rotatably supported on the base frame, the front end of the drive link is connected to the front end of the magazine, and the cam shaft is rotatably supported by the roller shaft connecting the rear parts of the drive links on both sides. The drive gear, which is operatively connected to the electric motor, and the eccentric cam are fixed to the drive shaft provided in parallel with the roller shaft. Eccentric cam and is juxtaposed with the cam roller, and upper and lower rotation driving mechanism of the magazine in the electric stapler, characterized in that linked to cover the cam cover on the outer periphery of the eccentric cam and the cam roller.