JP2003311646A - Stapler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a phenomenon that the legs of a staple are buckled by preventing a clincher from being largely tilted when the clincher is moved downward by the legs of the staple. <P>SOLUTION: An arm cover 21 is formed to cover the base and the sides of a clincher arm 14, a paper placing member 24 is rockably disposed between both side walls of the arm cover 21, and the clincher 22 is formed so that the upper is narrow and the lower part is projected toward both sides. The upper part of the clincher 22 is stored in an opening 25 formed in the paper placing member 24, and the side edge part of the lower part of the clincher 22 is stored in a guide groove 32 formed on both side walls of the arm cover 21 to be guided in the vertical direction. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stapler having a movable clincher that can be moved downward by staple legs penetrating a binding sheet, and prevents the clincher from tilting to prevent buckling of the staple legs. About possible stapler.

[0002]

2. Description of the Related Art A stapler in which a leg portion of a U-shaped staple having a plurality of sheets of binding paper penetrating is bent along the back surface of the binding sheet on the lower surface side of the binding sheet A clincher for abutting against the clincher for bending the leg is movably supported in the vertical direction, and is bent by engaging the leg of the staple with the clincher after the leg of the staple penetrates the binding sheet. . As shown in FIG. 6, the clincher 1 is accommodated in an opening formed in the sheet placing member 2 and is placed in the sheet placing member 2
It is arranged so that it can move vertically with respect to
A spring 4 interposed between the lower surface of the clincher 1 and the bottom surface of the arm cover 3 urges it upward.

The sheet placing member 2 has a slider 6 slidable in the front-rear direction along the clincher arm 5 between a supporting piece 7 formed on the arm cover 3 and the sheet placing member 2. At the start of the binding operation, the staple guide groove 8 is held at the upper position with respect to the arm cover 3, and the staple guiding groove 8 on the upper end surface of the clincher 1 is inserted into the sheet placing member 2.
It is arranged at a desired position on the upper edge of the opening 9 formed in the.

When the staples are driven into the binding sheets arranged on the upper surface of the sheet placing member 2 and the tip ends of the legs of the staples penetrate the binding sheets and penetrate to the back side of the binding sheets, the staple tips are clinched. The clincher 1 is brought into contact with the upper end surface of the sheet 1 to move the clincher 1 downward with respect to the sheet placing member 2. After the staples penetrate the binding sheets supported on the sheet placing member 2, the slider 6 is operated to the rear side so that the sheet placing member 2 can freely swing downward, and the staples are moved further downward. The leg portion of the staple is bent at a stretch by the clincher 1.

[0005]

As shown in FIG. 7 (a), a conventional clincher 1 is formed on a sheet placing member 2 which is arranged inside a side wall of an arm cover 3 and which can be vertically swung. The clincher 1 is housed in the opening 9
It is not possible to increase the widthwise dimension of the lower end of the.
Therefore, when the clincher reaches the bottom surface of the arm cover, an unbalanced load due to the staples causes a moment in the clincher, and the clincher remains inclined as shown in FIG. The groove may be tilted, and as a result, the leg portion of the staple may be buckled when the slider moves backward and the staple is lowered downward together with the sheet placing member.

According to the present invention, in a stapler having a movable clincher, the clincher is prevented from being greatly tilted when the clincher is moved downward by the staple legs, and the staple legs buckle. An object is to provide a stapler that eliminates the phenomenon.

[0007]

In order to solve the above problems, a stapler according to the present invention is a handle provided with a magazine containing a large number of staples and a driver for ejecting the staples contained in the magazine toward a binding sheet. And a clincher arm having a clincher portion that bends the front end of the leg of the staple punched out from the magazine and penetrating the spelling paper along the back surface of the splicing paper at the rear end of each rotatably supported portion. In the stapler, the clincher portion forms an arm cover so as to cover the bottom surface and the side surface of the clincher arm, and a paper placing member is swingably disposed between both side walls of the clincher arm. A clincher that is arranged between the paper and the sheet stacking member is formed by narrowing the upper part and projecting the lower part in both directions. Both were accommodate narrow upper portion of the clincher in an opening formed through the sheet mounting member,
By accommodating the side edge portion of the protruding portion of the lower part of the clincher in the guide groove formed on the inner surface of both side walls of the arm cover,
The guide for descending the clincher is configured to be guided by at least one of the opening of the sheet placing member and the guide groove of the arm cover.

According to the second aspect of the present invention, the width of the upper portion of the clincher and the width of the lower portion of the clincher that project in both directions are inclined with respect to the rotational moment due to the eccentric load of the staple applied to the upper portion of the clincher. It is characterized in that it is formed with a width ratio that is not affected.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of a stapler of the present invention, which has a magazine 10 for accommodating a large number of staples, a handle portion 12 having a driver 11 for ejecting the staples loaded in the magazine 10 toward a binding sheet, and A clincher arm 14 having a clincher portion 13 on the front end side for bending the tip ends of the legs of the staples ejected from the magazine 10 and penetrating the binding paper along the back surface of the binding paper is provided with support shafts 15 at respective rear end portions. It is rotatably supported.

At the front end of the magazine 10, there is formed an ejection port 16 for ejecting the first staple stored in the magazine 10 toward the binding sheets arranged on the lower surface of the magazine 10. A pusher 17 is arranged to urge the stored staples toward the ejection port 16. The pusher 17 is slidably supported along a guide rod 18 arranged in the magazine 10, and is urged toward the front of the magazine 10 by a pusher spring 19 arranged on the rear surface side of the pusher 17.

The driver 1 is operated by pressing the operation handle 20 arranged on the upper surface side of the handle portion 12.
1, the staples in the magazine 10 are ejected from the ejection port 16, the leg portions of the staples penetrate the binding sheet disposed between the magazine 10 and the clincher portion 13, and the leg portions of the staples penetrating the binding sheet. Is folded along the back surface of the binding sheet by the clincher portion 13 so that the binding sheet is bound.

A clincher portion 13 for bending the legs of the staple penetrating the binding sheet along the back surface of the binding sheet.
The clincher arm 14 is provided with a clincher 22 arranged so as to be vertically movable at a front end portion of an arm cover 21 mounted on the clincher arm 14 so as to cover the lower surface side of the clincher arm 14. A clincher groove 23 is formed on the end face so as to engage with the leg portion of the staple and guide the leg portion to be bent inward along the back surface of the binding sheet. Above the arm cover 21, there is arranged a paper placing member 24 whose rear end is swingably supported with respect to the clincher arm 14, and an opening formed in the front portion of the paper placing member 24. The clincher 22 is housed in 25. Further, the clincher 22 is biased upward by the spring 26 interposed between the lower surface of the clincher 22 and the bottom surface of the arm cover 21.

The sheet placing member 24 and the clincher arm 14
The sheet placing member 24 is urged upward by a spring 27 interposed between the sheet placing member 24 and the clincher arm 14, and the sheet placing member 24 is moved back and forth along the clincher arm 14 between the sheet placing member 24 and the clincher arm 14. Slider that can slide in any direction
8 is interposed between the slider 2 and the slider 2 which is arranged forward by the spring 29 at the start of the binding operation by the stapler.
The support portion 30 of 8 enters the lower surface of the sheet placing member 24 to prevent the sheet placing member 24 from swinging downward.
In this state, the sheet placing member 24 is held at an upper position with respect to the arm cover 21, and the clincher groove 23 on the upper end surface of the clincher 22 is desired at the upper edge of the opening 25 formed in the sheet placing member 24. It is located in the position.

As shown in FIG. 2, the lower portion of the clincher 22 is formed to be wide so as to project toward both sides of the sheet placing member 24 in the direction of both side surfaces, and the projecting portions 22a on both sides are formed. It is accommodated in a guide groove 32 formed on the inner wall surface of both side walls 31 of the arm cover 21, and the guide groove 32 guides the clincher 22 to move in the vertical direction. The upper portion of the clincher 22 may be guided by the opening 25 of the sheet placing member 24.

The size setting of the projecting portion 22a at the lower portion of the clincher 22 will be described with reference to FIGS. The action of the tilted clincher 22 seated on the bottom surface of the arm cover 21 to correct the tilt of the staple S is that the height h of the clincher groove 23 formed on the upper surface of the clincher 22 is h.
And the dimension d from the position where the leg of the staple S inclined to the clincher groove 23 is installed to the side edge of the lower protruding portion 22a. According to the result obtained by the experiment, as shown in the graph of FIG.
It was found that when the overhanging dimension d of the overhanging portion 22a is smaller than the boundary of the clincher height h, the buckling frequency increases. Therefore, the buckling can be prevented by setting the overhanging dimension d of the overhanging portion 22a to be 0.32 times or more the height h of the clincher.

The operating state of the above embodiment will be described below with reference to FIG. As shown in FIG. 3A, the sheet placing member 2
When the staple S is driven into the binding sheet P arranged on the upper surface of 4, the legs of the staple S penetrating the binding sheet P come into contact with the upper surface of the clincher 22, and the clincher 22 resists the urging force of the spring 26. Move it down. In the initial stage of the binding operation, the slider 28 is arranged between the sheet placing member 24 and the clincher arm 14, and the sheet placing member 24 is supported at the upper position.

As shown in FIG. 3B, when the staple S is tilted when the legs of the staple S penetrate the binding sheets P, one leg of the staple S engages with the clincher 22. One side of the clincher 22 is pressed downward and tilted to operate downward. However, since the lower part of the clincher 22 is guided in the guide grooves 32 formed in both side walls 31 of the arm cover 21. , Clincher 2
It is moved downward without increasing the inclination of 2. Since the overhanging portion 22a is formed wide so that the clincher 22 does not rotate due to the rotational moment due to the eccentric load of the staple S, the clincher 22 tries to be horizontal with the bottom surface of the arm cover 21 without tilting.

As shown in FIG. 3C, after the legs of the staples S penetrate the binding sheets P, the slider 28 is actuated to the rear side and the sheet placing member 24 and the clincher arm 14 are moved.
The sheet placing member 24 can be swung downward by retracting from the space.

As shown in FIG. 3D, the clincher 22 tilts even when the staple S and the binding sheet P are further pressed downward under the unbalanced load of FIG. 3C. Without binding, the legs of the staple S penetrating the lower surface of the binding sheet P do not buckle, are guided toward each other inward by the clincher groove 23, and are bent along the lower surface of the binding sheet P to bind the binding sheet P.

[0020]

As described above, according to the present invention, the lower portion of the clincher, which is held by the arm cover so as to be movable in the vertical direction, is extended in both directions to form an extended portion, and the upper portion of the clincher is attached to the paper. It is accommodated in the opening formed in the placing member, and the lower protruding portion is accommodated in the guide grooves formed in both side walls of the arm cover to guide it. It is possible to set the width larger than the width of the placing member, and it is possible to effectively prevent buckling of staples by contacting the lower surface of the clincher with the bottom surface of the arm cover without tilting the clincher. Become.

Further, even when the clincher moves downward with respect to the sheet placing member, the upper and lower portions of the clincher can be guided by the sheet placing member and the arm cover in the entire range of the moving range of the clincher. Therefore, it is possible to prevent the clincher from being greatly inclined, and it is possible to effectively prevent the occurrence of buckling.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of a clincher portion of the stapler of FIG.

3A and 3B show an operating state by the stapler of FIG. 1, FIG. 3A is a state immediately after staples penetrate a binding sheet in an initial stage of binding operation, and FIG. 3B is a clincher by a staple leg penetrating the binding sheet. Is moved downward, (c) is a state in which the sheet placing member is swingable, and the binding sheet and staple further move the clincher downward, and (d) is the staple leg with the back surface of the binding sheet. It shows a state of being bent along.

FIG. 4 is an explanatory view showing a correction mode by a clincher.

FIG. 5 is a graph showing the relationship between the height of the clincher groove and the dimension ratio of the dimension from the position where the staple leg inclined to the clincher groove is installed to the side edge of the lower overhang portion.

FIG. 6 is a vertical sectional side view showing a clincher arm portion of a conventional stapler.

7A and 7B show an operating state by the clincher arm of FIG. 6, where FIG. 7A shows an initial state of binding operation, and FIG. 7B shows a state in which the clincher is moved downward by the staple legs that penetrate the binding sheets. Show.

[Explanation of symbols]

13 Clincher section 14 clincher arm 21 Arm cover 22 clincher 23 Clincher groove 24 Paper loading member 25 openings 26 spring 27 spring 28 slider 29 spring 30 Support 31 both side walls 32 guide groove

Claims (2)

[Claims] 1. A handle portion having a magazine for storing a large number of staples, a driver for ejecting the staples accommodated in the magazine toward a binding sheet, and a staple ejected from the magazine and penetrating the binding sheet. In a stapler in which a clincher arm having a clincher portion that bends the front end of the leg portion along the back surface of the binding sheet is rotatably supported at each rear end portion, the clincher portion is a bottom surface of the clincher arm and An arm cover is formed so as to cover the side surface, and a sheet placing member is swingably disposed between both side walls of the arm cover,
A clincher arranged between the arm cover and the sheet placing member is formed by narrowing an upper portion and projecting a lower portion in both directions, and a narrow upper portion of the clincher is formed to penetrate the sheet placing member. The clincher is accommodated in the opening, and the side edges of the projecting portion of the lower portion of the clincher are accommodated in the guide grooves formed on the inner surfaces of both side walls of the arm cover, so that the guide for descending the clincher is at least the opening of the sheet placing member. A stapler characterized by being configured to be guided by one of the guide grooves of the arm cover. 2. The width of the upper portion of the clincher and the width of the lower portion of the clincher which are extended in both directions are formed to have a width ratio such that the clincher is not inclined with respect to the rotational moment due to the unbalanced load of the staple applied to the upper portion of the clincher. The stapler according to claim 1, wherein the stapler is a stapler.