JP2663801B2 - Staple feed mechanism for electric stapler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a staple feeding mechanism for feeding sheet-like staples, which are stored in multiple staple cartridges in a staple cartridge mounted on a magazine of an electric stapler, from the lowest one toward the front of the magazine. Things.

[0002]

2. Description of the Related Art Conventional feed mechanisms of this type include:
A feed means by a feed belt or a feed roller provided in the magazine is arranged facing the bottom opening of the staple cartridge, and the lower surface of the lowermost sheet-like staple in the staple cartridge is strongly contacted with the feed means. It is known that the feeding means is driven by an electric motor to derive the sheet staple from the staple cartridge and feed it to the front end of a magazine (Japanese Utility Model Publication No. 1-25672, etc.).

Since these staple feeding mechanisms require the driving force of an electric motor, there is a disadvantage that the apparatus becomes complicated. Therefore, while the ratchet is fixed to the shaft end of the roller shaft of the feed roller, an operating means having a pulling claw is attached to a drive link for driving the magazine, and the pulling claw of the operating means is attached to the ratchet when the driving link moves downward. By engaging the pulling pawl with the ratchet when moving upward and rotating the ratchet only while the ratchet is engaged, the sheet-like staple in contact with the feed roller is fed forward by the rotation amount. The mechanism was considered.

[0004] However, this feed mechanism requires a means for constantly urging the operating means to the ratchet side so that the pulling claw is securely engaged with the ratchet. In addition, since the rotation angle of the ratchet per stroke of the drive link is small, when the staple cartridge is replaced, the lowermost sheet-like staple is sent forward, and the staple at the front end reaches the driving position several times. Also have to repeat emptying.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a staple feed mechanism for an electric stapler capable of solving the above-mentioned problems and increasing a feed amount obtained by one stroke of a drive link with a particularly simple structure. And

[0006]

Means for Achieving the Object As a means for achieving the object, the staple feeding mechanism in the electric stapler according to the present invention accommodates a plurality of sheet staples in which straight staples are connected in a sheet form. A magazine with a staple cartridge with the lower end and the bottom of the front wall open is mounted on the base frame so as to be rotatable vertically, and a pair of drive links arranged on both sides of the magazine are rotatable vertically. Then, the magazine is rotated by the drive link operated by the electric motor, and when the magazine is rotated downward by the electric motor, the sheet-like staple supplied to the front end of the magazine is formed into a U-shape and punched out. In an electric stapler that spells the staple legs by penetrating the material to be sewn, the magazine includes a staple cartridge. A feed roller at a position facing the bottom of the cartridge, a ratchet operatively connected to the feed roller at a side of the magazine, and a front lever portion and a rear lever portion at a position facing the ratchet at a drive link. And a ratchet lever formed by bending the inverted lever into a U-shape, and a claw is formed at each end of the front lever portion. When the drive link rotates downward, the claw of the front lever portion is
When the drive link rotates upward, the pawls of the rear lever portion engage with the ratchets to rotate in the same direction, and the sheet abuts on the feed roller by the rotation of the feed roller interlocked with the rotation of the ratchet. The staples are fed forward.

[0007]

According to the above construction, when the driving link is driven downward, the pawl of the front lever portion of the ratchet lever engages with the pawl teeth on the front side of the ratchet and pushes down the ratchet to push the ratchet. Rotate forward. Thereafter, when the drive link is driven upward, the magazine is accordingly driven to rotate upward, but the magazine stops halfway. On the other hand, since the drive link is further driven upward, the upper pawl of the rear lever portion engages with the ratchet and pulls up to rotate the ratchet. As described above, the ratchet is rotated each time the magazine is rotated upward or downward, and the feed roller is driven to rotate forward in conjunction with the rotation, so that the staple cartridge abutting on the feed roller is rotated. The lowermost sheet staple sent out from the inside is fed forward due to frictional resistance with the feed roller.

As described above, according to the present invention, by forming the ratchet lever in an inverted U-shape, the urging means for constantly urging the ratchet lever to the ratchet side as in the related art is not required, and the structure is simplified. In addition, since the ratchet is driven to rotate at the time of each of the upper and lower operations of the drive link, the feed amount of the sheet-like staple obtained by one stroke of the drive link can be increased.

When there are two claws, the feed amount becomes large.

[0010]

1 and 2 show an electric stapler. In this electric stapler, a magazine 2 containing a staple cartridge 1 that accommodates sheet-like staples in multiple stages and has a front wall lower end and a bottom opened is mounted on a base frame 3 so as to be rotatable in the vertical direction. A pair of drive links 4 arranged on both sides of the motor 2 are vertically rotatably arranged, the magazine 2 is rotated by the drive link 4 operated by the electric motor 5, and the magazine 2 is rotated downward by the electric motor 5. When the staple is moved, the sheet-like staple supplied to the front end of the magazine 2 is formed into a U-shape and punched out toward the spelling table 6 at the front end of the base frame 3, and the legs of the staple are sewn on the spelling table 6. The material 7 is penetrated and spelled.

The rear ends of the magazine 2 and the drive link 4 are rotatably supported by a support shaft 8 provided on a standing piece 3a at the center of the base frame 3 as shown in FIG. At the front end of the magazine 2, as shown in FIG. 6, a forming / ejecting unit 1 having a driver 9 and a forming plate 10 provided between a face plate 31 and a guide member 32 so as to be vertically movable.
2 is provided, and the front end of the drive link 4 is connected to the driver 9 via a connection lot 33 (see FIG. 1).
Further, the rear end of the drive link 4 is integrally connected by a connecting plate 4a, and is driven up and down by a drive mechanism linked to the electric motor 5 to drive the magazine 2 together with the driver 9 so as to rotate vertically. I do. A position where the lower surface of the front end of the magazine 2 comes into contact with the spelling table 6 of the base frame 3 and a projection 11 formed laterally from the lower end of the magazine 2 are formed by curved arms 12 formed on the base frame 3.
The rotation range of the magazine 2 is up to a position where the magazine 2 is engaged (see FIGS. 2 and 5). The driver 9 is configured to move up and down relatively to the magazine 2, and the drive link 4 is set to be larger than the stroke of the magazine 2. Therefore, the driver 9 and the forming plate 10 are configured to move up and down relatively to the magazine 2.

The drive mechanism of the drive link 4 transmits the output of the electric motor 5 to the drive gear 14 via the intermediate gear 13, and the eccentric cam 1 fixed to the drive shaft 15 of the drive gear 14.
6 and a cam roller 18 supported on a connection shaft 17 of the drive link 4 are connected by covering with a cam cover 19, and the eccentric cam 16 is rotated by the drive shaft 15 to push the cam roller 18 or to pull the cam roller 18 by the cam cover 19. By doing so, the drive link 4 is rotated in the up and down direction. In addition, the drive link 4 may be any one that can convert the reciprocating rotation of the drive link 4 about the support shaft 8. May be adopted.

A mounting portion 20 (see FIG. 5) for attaching and detaching the staple cartridge 1 is formed at the center of the magazine 2. As shown in FIG. 7, the staple cartridge 1 accommodates a plurality of sheet staples 21 in which straight staples are connected in a sheet form. The lower ends of the front and rear walls are open, and the lowermost sheet is A protruding edge 22 that supports the lower surface of both side edges of the staple 21 is formed, except for this, and the bottom is open.
A cap (see FIG. 1) is attached to the upper part of the staple cartridge 1, and the cap and the sheet-like staple 2 are attached.
A spring (not shown) is disposed between the sheet staple 1 and the sheet staple 21.

Next, the lowermost sheet-like staple in the staple cartridge 1 is formed into a front forming / ejecting portion 22.
As shown in FIGS. 2 and 3,
A feed roller 23 disposed facing an opening at the bottom of the staple cartridge 1, and a ratchet 24 fixed to an end of a feed roller shaft 23 a at a side of the magazine 2.
And an inverted U-shaped ratchet lever 25 fixed to the drive link 4 at an upper position facing the ratchet 24.

The ratchet 24 has a feed roller shaft 26.
It does not need to be fixed directly to the end of the. It may be fixed to another shaft (not shown) operatively connected to the feed roller 23.

The ratchet lever 25 is made of synthetic resin or the like as shown in FIG.
b is formed in an inverted U-shape, and an L-shaped piece 25c is formed laterally from the uppermost portion, and the L-shaped piece 25c is locked in the engagement recess 27 of one drive link 4. It is swingably supported. One push claw 28 is formed at the tip of the front lever 25a, and two upper and lower pull claws 29, 30 are formed at the tip of the rear lever 25b. The gap between the claws 28, 29 and 30 is formed to be smaller than the outer diameter of the ratchet 24.
Further, when the drive link 4 is at an upper position relative to the magazine 2, the ratchet 2
4 and is formed to engage with the pawl teeth of the ratchet 24 when the drive link 4 moves downward relative to the magazine 2. In this case, when the ratchet lever 25 moves downward, the rear lever 2
The push claw 28 of the front lever portion 25a is engaged with the ratchet 24 earlier than the pull claw 30 at the lower portion of 5b.
Further, when the ratchet lever 25 moves upward from the lower end position, the pulling claw 29 on the upper portion of the rear lever portion 25b is formed so as to engage with the ratchet 24 earlier than the pushing claw 28 of the front lever portion 25a. ing.

According to the feed mechanism, FIGS. 4 (a), (b) and (c)
When the drive link 4 is driven downward and the magazine 2 is also rotated downward, the lower surface of the front end of the magazine 2 contacts the upper surface of the material 7 to be sewn and does not move further downward. On the other hand, since the drive link 4 is further driven downward, the push claw 28 of the front lever portion 25a of the ratchet lever 25 engages with the claw tooth on the front side of the ratchet 24, and pushes this down to rotate the ratchet 24 forward. Thereafter, when the drive link 4 is driven upward, the magazine 2 is also driven to rotate upward accordingly, but the projection 11 of the magazine 2 engages with the curved arm 12 on the way and stops rising. . On the other hand, since the drive link 4 is further driven upward, as shown in FIGS.
5, the upper pulling pawl 29 engages with the pawl teeth of the ratchet 24 and pulls up, and then the lower pulling pawl 30 engages with the rear pawl teeth of the ratchet 24 and pulls this up. The ratchet 24 is continuously rotated forward. As described above, each time the magazine 2 rotates upward or downward, the ratchet 24 is rotated, and the feed roller 23 is driven to rotate forward in conjunction with the rotation. For this reason,
The lowermost sheet staple 21 in the staple cartridge 1 that is in contact with the feed roller 23 is sent to the front forming / ejecting unit 12 by the frictional resistance of the feed roller 23 when the feed roller 23 rotates. Moreover, in the rear lever portion 25b, 2
Since it is rotated by the individual pulling claws 29, 30, a sufficient feed amount can be obtained. After the first sheet-like staples 21 reach the forming / ejecting portion 12, the staples need only be fed by one vertical movement (one cycle) of the magazine 2 and have a higher feeding force. At this time, since the feed roller 23 idles and urges the sheet-like staples 21 in the forward direction, it is possible to prevent the struck staples from escaping to the side opposite to the feed direction due to the load penetrating the material 7 to be sewn. can do.

When the ratchet lever 25 moves upward from the lower end position, as shown in FIG. 4 (c), the pulling claw 29 above the rear lever portion 25b is closer to the front lever portion 25.
(a) is formed so as to be engaged with the ratchet 24 before the push claw 28 of FIG. 1a, so that the push claw 28 of the front lever portion 25a hits the ratchet 24 to prevent the ratchet 24 from being reversed by the frictional force. Can be.

As described above, according to the staple feeding mechanism, since the ratchet lever 25 is formed in an inverted U-shape, there is no need for an urging means for constantly urging the ratchet lever to the ratchet side as in the related art. In addition to the simple structure, the ratchet 24 is rotationally driven when the drive link 4 is rotated up and down by the push claws 28 and the pull claws formed on the front lever portion 25a and the rear lever portion 25b, respectively. The feed amount of the sheet staples 21 obtained by one stroke of the drive link 4 can be increased.

The sheet-like staples 21 supplied to the forming / ejecting section 12 at the front end of the magazine 2 by the feed mechanism are first turned into staples 21a at the front end in the forming section as shown in FIG. After being formed into a U-shape, it is guided and supplied to a punching portion on the back surface of the face plate, where it is punched as shown in FIG. 7 is bent by the clincher groove of the spelling table 6.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a main part of the electric stapler.

FIG. 3 is a central longitudinal sectional view of the electric stapler.

FIGS. 4 (a), (b), (c) and (d) are explanatory views of an operation mode of the feed mechanism according to the present invention.

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

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

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

FIGS. 8 (a) and (b) are explanatory diagrams of a staple forming and punching mode in a magazine forming and punching section, respectively.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 staple cartridge 2 magazine 3 base frame 4 drive link 5 electric motor 7 sewn material 21 sheet staple 23 feed roller 24 ratchet 25 ratchet lever 25a front lever portion 25b rear lever portion 28 push nail 29 pull nail 30 pull nail

Claims (2)

(57) [Claims] 1. A magazine that accommodates sheet staples in which straight staples are connected in a sheet form and that has a staple cartridge with a front wall lower end and a bottom part opened is rotatable vertically on a base frame. On the other hand, a pair of drive links arranged on both sides of the magazine are vertically rotatably arranged, and the magazine is rotated by the drive link operated by the electric motor, and the magazine is rotated downward by the electric motor. In the electric stapler, the sheet-like staple supplied to the front end of the magazine is formed into a U-shape and punched out, and the legs of the staple are spelled by penetrating the material to be sewn. A feed roller is arranged at a position, and a ratchet operatively connected to the feed roller is arranged on a side of the magazine, One drive link fixes a ratchet lever in which a front lever portion and a rear lever portion are curved in an inverted U-shape at a position facing the ratchet, and a claw is formed at each end of the front lever portion, When the drive link rotates downward, the claw of the front lever portion engages with the ratchet when the drive link rotates upward, and rotates in the same direction.
A staple feeding mechanism in an electric stapler, wherein a sheet staple in contact with the feed roller is supplied forward by rotation of a feed roller interlocked with rotation of the ratchet. 2. The staple feeding mechanism of an electric stapler according to claim 1, wherein the rear lever portion has two claws.