JP4135392B2 - stapler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stapler provided with a movable clincher that is moved downward by a staple leg penetrating a binding sheet and capable of preventing buckling of the staple leg by suppressing the inclination of the clincher.
[0002]
[Prior art]
In a stapler in which a leg of a U-shaped staple having a plurality of sheets bound therethrough is bent along the back surface of the binding sheet on the lower surface side of the binding sheet, the leg is in contact with the leg of the staple. A clincher for bending the portion is supported so as to be movable in the vertical direction, and the staple leg is bent by engaging the clincher with the staple leg after passing through the binding sheet. As shown in FIG. 6, the clincher 1 is accommodated in an opening formed in the paper placement member 2 and arranged so as to be movable in the vertical direction with respect to the paper placement member 2. It is urged upward by a spring 4 interposed between the bottom surface of the cover 3.
[0003]
The paper placement member 2 is bound by a slider 6 slidable in the front-rear direction along the clincher arm 5 between the support piece 7 formed on the arm cover 3 and the paper placement member 2. Is held at an upper position with respect to the arm cover 3, and the staple guide groove 8 on the upper end surface of the clincher 1 is disposed at a desired position on the upper end edge of the opening 9 formed in the paper placement member 2. Yes.
[0004]
When staples are driven into the binding paper disposed on the upper surface of the paper placement member 2 and the leg ends of the staples penetrate the binding paper and pass through the back side of the binding paper, the leading ends of the staples are placed on the clincher 1. The clincher 1 is moved downward with respect to the paper placing member 2 in contact with the end face. After the staple passes through the binding paper supported on the paper placement member 2, the slider 6 is operated to the rear side to freely swing the paper placement member 2, and the staple is further moved downward. Thus, the leg portions of the staple are bent at once by the clincher 1.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 7A, the conventional clincher 1 is accommodated in an opening 9 formed in a paper placement member 2 that is disposed inside the side wall of the arm cover 3 and can swing in the vertical direction. In addition, the dimension in the width direction of the lower end portion of the clincher 1 cannot be increased. For this reason, when the clincher arrives at the bottom surface of the arm cover, a moment is generated in the clincher due to the offset load due to the staple, and the clincher remains inclined as shown in FIG. As a result, when the slider moves backward and the staple moves downward together with the paper placement member, the leg of the staple may be buckled.
[0006]
The present invention eliminates the phenomenon that a staple is buckled in a stapler having a movable clincher by preventing the clincher from being greatly inclined when the clincher is moved downward by the staple leg. It is an object of the present invention to provide a stapler that is configured to do so.
[0007]
[Means for Solving the Problems]
Stapler of the present invention for solving the above problems, a magazine for accommodating a plurality of staples, a handle part having a driver hammer out toward the sheet spelling staples housed within the magazine is driven out from the magazine A stapler in which a clincher arm provided with a clincher portion that is capable of vertically moving a clincher portion that bends the front end portion of the leg portion of the staple that has passed through the binding paper along the back surface thereof is rotatably supported at each rear end portion. 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 placement member is swingably disposed between both side walls of the arm cover, and the arm cover and the paper placement member The clincher disposed between the upper portion is formed with a narrow upper portion and a lower portion projecting in both directions. When the clincher is lowered, the narrow upper portion is accommodated in an opening formed through the paper placement member, and the side edge of the protruding portion of the lower portion of the clincher is accommodated in the guide groove formed on the inner surface of both side walls of the arm cover. characterized in that the reduced guide was also configured to more guided by the guide groove of the front Symbol arm cover.
[0008]
In the invention according to claim 2, the width of the upper portion of the clincher and the width of the lower portion protruding in both directions are such that the clincher is inclined with respect to the rotational moment due to the offset load of the staple applied to the upper portion of the clincher. It is characterized in that the width ratio is not present.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the examples shown in the drawings. FIG. 1 shows an embodiment of a stapler according to the present invention, a magazine 10 for storing a large number of staples, a handle portion 12 having a driver 11 for driving staples loaded in the magazine 10 toward a binding sheet, and A clincher arm 14 provided with a clincher portion 13 on the leading end side that bends along the back surface of the stapled paper is formed by a support shaft 15 at each rear end. It is supported rotatably.
[0010]
The front end portion of the magazine 10 is formed with a punching hole 16 for ejecting the first staple stored in the magazine 10 toward the binding paper disposed on the lower surface of the magazine 10. Further, the magazine 10 is accommodated in the magazine 10. A pusher 17 for pressing and urging the staple toward the punching hole 16 is disposed. The pusher 17 is slidably supported along a guide rod 18 disposed in the magazine 10 and is urged toward the front of the magazine 10 by a pusher spring 19 disposed on the rear surface side of the pusher 17.
[0011]
By pressing the operating handle 20 disposed on the upper surface side of the handle portion 12, the staples in the magazine 10 are driven out from the punching port 16 through the driver 11, and the leg portions of the staples become the magazine 10 and the clincher portion 13. The stapling sheets disposed between the sheets are penetrated, and the leg portions of the staples penetrating the binding sheets are bent along the back surface of the binding sheets by the clincher unit 13 so that the binding sheets are bound.
[0012]
The clincher portion 13 for bending the leg of the staple penetrating the binding paper along the back surface of the binding paper is vertically arranged on the front end portion of the arm cover 21 attached to the clincher arm 14 so as to cover the lower surface side of the clincher arm 14. The clincher 22 is arranged so as to be movable in the direction, and the upper end surface of the clincher 22 is engaged with the leg portion of the staple to bend the inward portion along the back surface of the binding paper. A clincher groove 23 is formed so as to be guided. A paper placement member 24 whose rear end is supported swingably with respect to the clincher arm 14 is disposed above the arm cover 21, and an opening formed in the front portion of the paper placement member 24. The clincher 22 is accommodated in 25. Further, the clincher 22 is urged upward by a spring 26 interposed between the lower surface of the clincher 22 and the bottom surface of the arm cover 21.
[0013]
The paper placement member 24 is urged upward by a spring 27 interposed between the paper placement member 24 and the clincher arm 14, and further, between the paper placement member 24 and the clincher arm 14. The slider 28 is slidable in the front-rear direction along the clincher arm 14, and at the start of the binding operation by the stapler, the support portion 30 of the slider 28 disposed in front by the spring 29 is provided on the sheet placement member 24. The sheet placement member 24 is prevented from entering the lower surface and 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 arranged at the position.
[0014]
As shown in FIG. 2, the lower part of the clincher 22 is broadly formed so as to project toward both sides of the sheet placing member 24, and the projecting portions 22 a on both sides are formed on the arm cover 21. These guide grooves 32 are accommodated in guide grooves 32 formed on the inner wall surfaces of the both side walls 31, and the guide grooves 32 guide the movement of the clincher 22 in the vertical direction. Note that the upper portion of the clincher 22 may be guided by the opening 25 of the sheet placing member 24.
[0015]
With reference to FIG. 4 and FIG. 5, the dimension setting of the projecting portion 22 a below the clincher 22 will be described. The action of the inclined clincher 22 seated on the bottom surface of the arm cover 21 to correct the inclination of the staple S includes the height h of the clincher groove 23 formed on the upper surface of the clincher 22 and the staple inclined to the clincher groove 23. This is related to the dimensional ratio with the dimension d from the position where the S leg is installed to the side edge of the lower overhanging portion 22a. According to the results obtained in the experiment, as shown in the graph of FIG. 5, the overhanging dimension d of the overhanging portion 22a is defined by the relationship between the overhanging portion dimension d = 0.32 and the clincher height h. It was found that the smaller the frequency, the more frequently the buckling occurs. Therefore, the occurrence of buckling can be prevented by setting the overhanging dimension d of the overhanging portion 22a to 0.32 times or more the height h of the clincher.
[0016]
Hereinafter, the operation state of the embodiment will be described with reference to FIG. As shown in FIG. 3A, when the staple S is driven into the binding paper P disposed on the upper surface of the paper placement member 24, the leg of the staple S penetrating the binding paper P comes into contact with the upper surface of the clincher 22. The clincher 22 is moved downward against the urging force of the spring 26. In the initial stage of the binding operation, a slider 28 is disposed between the paper placement member 24 and the clincher arm 14, and the paper placement member 24 is supported at an upper position.
[0017]
As shown in FIG. 3B, when the staple S is tilted when the leg of the staple S passes through the binding paper P, one leg of the staple S is engaged with the clincher 22 and the clincher 22 is engaged. The lower part of the clincher 22 is guided in the guide grooves 32 formed in the both side walls 31 of the arm cover 21, so that the clincher 22 is operated. It is moved downward without increasing the inclination of .
[0018]
As shown in FIG. 3C, after the leg portion of the staple S has passed through the binding paper P, the slider 28 is operated backward to retract from between the paper placement member 24 and the clincher arm 14, thereby The sheet placing member 24 can swing downward.
[0019]
As shown in FIG. 3D, the staple S and the binding paper P are further pressed downward in the state where the unbalanced load shown in FIG. 3C is received, and the lower surface of the clincher 22 is seated on the bottom surface of the arm cover 21. The leg of the staple S that penetrates the lower surface of the binding paper P without tilting the clincher 22 is not buckled, and is guided toward the inside by the clincher groove 23 and bent along the lower surface of the binding paper P. It is bound.
[0020]
【The invention's effect】
As described above, according to the present invention, the lower part of the clincher held on the arm cover so as to be movable in the vertical direction is projected in both directions to form the projecting part, and the upper part of the clincher is formed on the paper placement member. Since the lower overhanging part is accommodated in the guide grooves formed on both side walls of the arm cover and guided, the width dimension of the lower part of the clincher is the width dimension of the paper placing member. The buckling of the staples can be effectively prevented by bringing the lower surface of the clincher and the bottom surface of the arm cover into contact with each other without tilting the clincher.
[0021]
Further, even when the clincher moves downward with respect to the paper placement member, it is possible to guide the upper and lower portions of the clincher in the entire range of the movement range of the clincher by the paper placement member and the arm cover. It is possible to prevent the clincher from being greatly inclined and to effectively prevent the occurrence of buckling.
[Brief description of the drawings]
FIG. 1 is a longitudinal 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.
FIGS. 3A and 3B show an operation state by the stapler of FIG. 1, in which FIG. 3A shows a state immediately after the staple has passed through the binding paper in the initial stage of binding operation, and FIG. (C) is a state where the paper placement member is swingable and the binding paper and staples move the clincher further downward. (D) is a state where the staple legs are the back side of the binding paper. The state bent along is shown.
FIG. 4 is an explanatory diagram showing a correction mode by a clincher.
FIG. 5 is a graph showing the relationship between the height of the clincher groove and the size ratio between the position where the staple leg inclined to the clincher groove is installed and the side edge of the lower overhanging portion.
FIG. 6 is a vertical side view showing a clincher arm portion of a conventional stapler.
FIGS. 7A and 7B show an operation state by the clincher arm of FIG. 6, in which FIG. 6A shows an initial state of binding operation, and FIG. 7B shows a state in which the clincher is moved downward by a staple leg penetrating the binding paper. Show.
[Explanation of symbols]
13 Clincher part 14 Clincher arm 21 Arm cover 22 Clincher 23 Clincher groove 24 Paper placement member 25 Opening 26 Spring 27 Spring 28 Slider 29 Spring 30 Support part 31 Both side walls 32 Guide groove

Claims (2)

A magazine for accommodating a plurality of staples, a handle part having a driver hammer out toward the sheet spelling accommodated staple in the magazine, the leg tip portion of the staple penetrating the are with sheets of paper punched from the magazine In a stapler in which a clincher arm that is bent along a back surface of a sheet is provided so as to be movable up and down at each rear end portion, the clincher portion has a bottom surface and a side surface of the clincher arm. An arm cover is formed so as to cover, a paper placing member is swingably disposed between both side walls of the arm cover, and a clincher disposed between the arm cover and the paper placing member has a narrow upper portion and An opening formed by projecting a lower part in both sides and a narrow upper part of the clincher penetrating the paper placing member Is housed, by the side edges of the projecting portion of the lower portion of the clincher is accommodated in the guide grooves formed on the inner surface of both side walls of the arm cover, the guide groove of the front Symbol Wristlet also less guidance during clincher descending A stapler configured to be guided more.   The width of the upper part of the clincher and the width of the lower part projecting in both directions are formed so that the clincher is not inclined with respect to the rotational moment due to the offset load of the staple applied to the upper part of the clincher. The stapler according to claim 1, characterized in that:

Images