JPH10128683A - Leg part cutting mechanism for staple of motor-driven stapler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leg part cutting mechanism for a staple of a motor- driven stapler, which can operate a cutter by a simple structure also simplify a shape of the cutter and attain reduction of a cost. SOLUTION: In a clincher guide 4, a cut hole 8 exposing a tip end of a leg part of an inserted staple 2 is formed, behind the clincher guide 4, a hand cutter 11 protruded forward is formed in a front end upper part, a drive link 10 capable of turning forward/backward with a front part lower end serving as the center is arranged, and, when the drive link 10 is turned forward, a tip end of the hand cutter 11 is penetrated through the cut hole 8 so as to protrude forward, while cutting a leg part of the staple 2 exposed in the cut hole 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric stapler staple leg cutting mechanism for cutting a staple leg into an appropriate length depending on the thickness of a material to be sewn.

[0002]

2. Description of the Related Art Conventionally, in order to cut an excess length of a leg of a staple, as shown in FIG. 6 (a), a driver 1 is mounted on an upper surface of a cylindrical push cutter 30 movably arranged in a forward and backward direction. Tip 2a of leg of staple 2 hammered out by
A hole 31 for inserting the staple 2 is formed in the hole 31.
Push cutter 3 with the tip 2a of the leg part inserted.
The front end 2a of the leg of the staple 2 was cut by the edge of the clincher guide 32 by moving the front and back 0. In addition, 33 is a spelling table and 34 is a spelling material.

[0003]

However, since the push cutter 30 moves back and forth, there are two cams, a cam 37 for pushing the cutter forward and a cam 35 for pushing back the push cutter 30 moved forward. And the guide 36 for operating the push cutter 30 horizontally has to be provided, which complicates the structure. Further, the staple 2 inserted into the push cutter 30 is not always formed in an accurate U-shape. The tip 2a is not always in the same state because the legs tend to be slightly open or slightly closed. Therefore, since the shape and size of the hole 31 for inserting the tip 2a of the leg must be determined by assuming such conditions, the shape of the hole 31 of the push cutter 30 is the same as FIG. Because it must be processed into a complex shape like
The shape of the cutter became complicated, and an increase in manufacturing cost was unavoidable.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, enables the cutter to be operated with a simple structure, simplifies the shape of the cutter, and reduces the cost of the staple of the electric stapler. An object of the present invention is to provide a leg cutting mechanism.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, an electric stapler staple leg cutting mechanism according to the present invention includes a staple leg which penetrates a material to be sewn at a predetermined distance back and forth. It is inserted into the clincher guide for the movable clincher which is juxtaposed, and an extra portion of the leg portion is exposed to a cutting hole formed penetrating the front and rear of the clincher guide, and the exposed leg portion is pushed off by a push-off cutter. In the leg stapling mechanism of the staple of the electric stapler, the push cutter is formed to rotate back and forth around a fulcrum provided behind the clincher guide so as to protrude and retract from the cutting hole. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a main part of an electric stapler, wherein reference numeral a denotes a base, and b denotes a magazine provided above the base. This electric stapler drives the driver 1 by an electric motor and a drive mechanism (not shown) so that the staples 2 penetrate the material 3 on the spelling table 14, and the tip 2a of the leg of the staple 2 (FIG. 2). ) Penetrates through the material to be sewn 3 and projects below the back surface thereof, the tips 2 a are inserted into the two clincher guides 4 arranged side by side at a predetermined interval. It is configured as follows. Inside the clincher guide 4, a pair of staples 2 that bends the legs of the staple 2 along the back surface of the material 3 on a support shaft 7 provided at a position corresponding to both sides of the two legs of the staple 2. Movable clincher 5
Are rotatably supported.

[0007] The clincher mechanism for operating the movable clincher 5 is shown in FIG. 5 after the driver 1 operates to the bottom dead center.
2 (a) and 2 (b), the cam 25 rotates to lower the drive lever 6, and the drive lever 6 rotates the movable clincher 5 as shown in FIGS. 2 (a) and 2 (d). . The cam 25 is configured to be linked to a motor (not shown) provided on the base a via a gear.

Next, a staple leg cutting mechanism is provided near the movable clincher. This cutting mechanism is formed by pushing and cutting the cutter 11 into and out of the cutting hole 8, and the cutting hole 8 is formed in a substantially circular shape.
It is formed as shown in detail in FIG. The distance between the spelling table 14 on which the material 3 is placed and the cutting hole 8 is constant, and the legs of the staples 2 penetrating the material 3 as in the case where the material 3 is thin. When the tip is too long, an extra tip of the leg of the staple 2 is exposed.

As shown in FIG. 3, the push cutter 11 is formed at the front end of the drive link 10 disposed behind the clincher guide 4. The push cutter 11 is formed in a cylindrical shape, and a needle receiver 12 is formed in an arc shape at a lower portion of the tip. The lower end of the drive link 10 is rotatably supported on the base a with the shaft 13 as a fulcrum, and when the roller 15 mounted on the rear portion is pushed up by the cam 16, the drive link 10 turns forward around the shaft 13 and pushes off. Cutter 1
The front end of the projection 1 projects forward and enters a cutting hole 8 formed in the clincher guide 4, and then retreats and retreats from the cutting hole 8.

The pushing cutter 11 is formed such that when its tip passes through the cutting hole 8, the upper peripheral edge moves while approaching the edge of the cutting hole 8 most, and the drive link 10 rotates backward. When moved, the push cutter 11 is retracted from the cutting hole 8, but the needle receiver 12 is formed so as to remain inside the clincher guide 4.

Further, the cam 16 constituting the leg cutting mechanism is also similar to the cam 25 of the clincher mechanism in that the base a
The operation timing is such that after the driver 1 moves to the bottom dead center, the cam 16 first rotates and the leg of the staple 2 is moved. The operation of the cam 25 is controlled so that the cam 25 is rotated after cutting.

According to the above construction, as shown in FIG. 2A, the leg of the staple 2 which is driven into the material 3 to be sewn by the driver 1 is inserted into the clincher guide 4, and the tip 2a is movable. It comes into contact with the inclined upper surface of the clincher 5 and is guided inward along the upper surface to bend. When the material to be sewn 3 is thin (the number of sheets is small), an extra portion (tip 2a) of the leg is exposed to the cutting hole 8 as shown in FIG. When the driver 1 reaches the bottom dead center, a motor (not shown) provided on the base a operates as shown in FIG.
Push up. The drive link 10 rotates forward about the shaft 13, and the tip of the push cutter 11 penetrates the cutting hole 8 of the clincher guide 4 and projects forward. At this time, the tip 2a of the leg of the staple 2 protruding into the cutting hole 8 at the upper peripheral edge of the push cutter 11 is cut, and the needle holder 1 is cut.
2 (see FIGS. 2 (c) and 4). The needle receiver 12 remains in the clincher guide 4 even if the push-off cutter 11 retreats. When the tip 2a of the leg portion accumulates on the needle receiver 12, the tip portion 2a of the leg portion will eventually fall from the tip of the needle receiver 12, but the cut tip portion 2a of the leg portion will fall into the waste container 20 formed on the front surface of the clincher guide 4. The waste is guided to the waste container 20 and discharged outside. When the maximum diameter of the cam 16 shown in FIG.
As a result, the drive link 10 is rotated backward about the shaft 13, and the pushing cutter 11 is retracted from the cutting hole 8.

After the cutting mechanism is operated, the clincher mechanism is operated, and as shown in FIG.
Is engaged with the roller 26 attached to the rear end of the drive lever 6, so that when the diameter of the cam 25 increases, the rear end of the drive lever 6 is pushed up. The front end of the drive lever 6 moves down about the shaft 27 to push down the clincher 5, so that
As shown in FIG. 2 (d), the rear end of the clincher 5 is pivoted upward about the support shaft 7, and the leg of the staple 2 is bent along the back surface of the material 3 to be sewn. The material 3 can be bound. Since the excess length of the tip of the leg of the staple 2 is cut, the tip of the bent leg does not overlap each other, and the binding portion is processed neatly.

Then, as shown in FIG.
When the maximum diameter passes through the roller 26, the drive lever 6 is urged by the spring 28 to return and rotate, the pushing up of the tip of the clincher 5 is released, and the clincher 5 also returns to the initial position and moves again to the next spelling. Operation is prepared.

[0015]

According to the cutting mechanism of the present invention, it is possible to cut the extra length of the staple leg by rotating the cutter, and it is not necessary to provide a guide for the cutter as in the prior art. In addition to simplifying the structure, the shape of the cutter is simple and does not require complicated processing. Therefore, a failure is less likely than in the related art, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part on a side showing a configuration of a cutting mechanism according to the present invention.

Fig. 2 (a) (b) (c) (d) is a longitudinal section of the main part on the front side.

FIG. 3 is an exploded perspective view showing the configuration of the cutting mechanism.

FIG. 4 is a longitudinal sectional view of a main part on a side surface showing an operation mode of a cutter.

5 (a) and 5 (b) are longitudinal cross-sectional views of a main part on a side showing an operation mode of a clincher mechanism.

FIG. 6 is a sectional view of a main part showing a conventional configuration of a cutting mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driver 2 Staple 3 Material to be sewn 4 Clincher guide 5 Clincher 8 Cutting hole 10 Drive link 11 Push cutter

Claims (1)

[Claims] 1. A staple leg which penetrates a material to be sewn is inserted into a clincher guide for movable clinchers arranged side by side at a predetermined interval, and an extra portion of the leg is inserted into the clincher guide. A stapling leg cutting mechanism for an electric stapler for exposing an exposed leg to a cutting hole formed by penetrating front and rear and pushing the exposed leg with a cutting cutter, wherein the pushing cutter is centered on a fulcrum provided behind the clincher guide. A stapling leg cutting mechanism for an electric stapler, characterized in that the staple is turned back and forth so as to protrude and retract from the cutting hole.