JP2007296617A - Spring guide fixing structure of magazine of stapler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure of a spring guide 15, which is superior in installation performance, and also reduces cost. <P>SOLUTION: The spring guide fixing structure has: a pusher 13 engaging with the rear end of a staple stored inside; a pusher spring 14 pressing the pusher 13 to the striking-out part 12 side; and the spring guide 15 guiding the pusher spring 14 in the pressing direction of the pusher 13, in a magazine 5 having a striking-out part 12 of the forefront staple on the tip, and fixes one end part of the spring guide 15 to a rising piece 18 of an end part of the magazine 5. An engaging groove 21 is formed on the end of the rising piece 18, and the spring guide 15 is made of a synthetic resin. Its one end part is formed larger than the engaging groove 21. An end-split part 23 is formed by splitting the one end part into two parts. In the end-split part 23, a recessed groove 26 engaging with the groove bottom of the engaging groove 21 of the rising piece 18 is formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a spring guide fixing structure for a stapler magazine that guides a pusher spring for pressing a staple disposed in the stapler magazine in a pressing direction.

  The stapler magazine stores linked staples, and is provided with a feed mechanism for feeding these linked staples to a striking portion at the front end of the magazine. This feed mechanism is mainly composed of a staple pusher that engages with the rear end of the linked staple and a pusher spring that presses the staple pusher toward the launching portion. The pusher spring is a coil spring. In order for the coil spring to efficiently expand and contract in the longitudinal direction, it is necessary to insert a spring guide into the center of the pusher spring and fix the spring guide so as to be held at a predetermined position.

As a conventional pusher spring guide fixing structure, a structure is known in which the front and rear ends of a spring guide made of steel bar are held by one of the fixing pieces formed at the front and rear ends of a metal magazine and fixed to the other. It has been. This is because the end of the spring guide is fixed to the standing piece of the magazine. The constriction is formed by denting both sides of the end of the spring guide with a press, and the constriction on both sides is formed at the end of the magazine. Engage in the engagement groove formed at the upper end of the raised piece so that it cannot move back and forth, and further, the upper end of the raised piece is bent inward to narrow the groove width of the engagement groove and the spring guide moves upward It was the structure which made it impossible (for example, refer patent document 1).
JP 2005-138248 A

  However, the above-described fixing structure requires a process of forming a constricted part at the rear end part of the spring guide and a bending process for bending the upper end part of the engaging groove of the standing piece inward, and the structure is quite complicated. It cannot be said that the assembling property is also good. In particular, the bending of the upright piece is performed after the spring guide is engaged with the engagement groove, so that the operation is troublesome.

  Furthermore, with the above-described spring guide fixing structure, disassembly after assembly of the spring guide is difficult, and the pusher spring or spring guide cannot be easily replaced when the pusher spring or spring guide is damaged, resulting in poor maintainability. When replacement and repair work are repeated, there is a problem that the standing piece is damaged due to metal fatigue or the like.

  The present invention proposes an improved structure for solving the above-described problems in the structure for fixing a pusher spring guide of a conventional stapler magazine, and by simplifying the mounting structure for fixing the spring guide to the magazine. Another object of the present invention is to provide a structure for fixing a spring guide of a magazine of a stapler that can improve the assembly of the spring guide and can reduce the cost for fixing the spring guide.

  In order to solve the above-mentioned problem, the invention according to claim 1 is capable of engaging with the rear end of the staple stored in the magazine having a storage space for the linked staples and having a leading staple launching portion at the front end. A stapler provided with a provided pusher, a pusher spring that pushes the pusher toward the launching portion, and a spring guide that guides the pusher spring in the pushing direction of the pusher, and fixes one end of the spring guide to an upright piece at the end of the magazine. In the spring guide fixing structure of the magazine, an engaging groove is formed at the tip of the upright piece, the spring guide is made of synthetic resin, one end thereof is formed larger than the engaging groove, and two one end portions are formed. It is characterized in that a cracked portion is formed, and a concave groove that engages with the groove bottom of the engaging groove of the standing piece is formed in the cracked portion.

  The invention according to claim 2 is characterized in that a retaining means for preventing the spring guide from slipping out from the open end of the engaging groove of the standing piece is provided.

  According to the first aspect of the present invention, the tip crack portion of the spring guide expands by elasticity when it is deeply pushed into the engagement groove, and the groove width of the engagement groove is narrow on the opening side. By means, it is possible to effectively prevent the spring guide from coming out of the open end of the engaging groove of the upright piece. Further, since the engaging groove of the spring guide engages with the groove bottom of the engaging groove of the upright piece, the back and forth movement of the spring guide can be stably and effectively prevented. Therefore, the spring guide can be fixed.

  Further, the spring guide is made of synthetic resin and can be manufactured easily and inexpensively, and the engagement groove of the magazine may be press-molded in advance. To fix the spring guide to the engagement groove, the end of the spring guide is simply used. By pushing the part with a little strong force, the cracked part closes and opens and can be easily attached. Therefore, the structure for fixing the spring guide to the magazine can be simplified, the assemblability of the spring guide can be improved, and the cost for fixing the spring guide can be reduced. Moreover, when replacing or repairing the pusher spring, it is only necessary to pull out the spring guide from the engagement groove, so the work is easy, and even if the spring guide is repeatedly attached and removed for replacement, maintenance, etc., it will be damaged or deformed. There is nothing to do.

  According to the second aspect of the present invention, since the spring guide can be prevented from slipping out from the open end of the engaging groove of the upright piece by the retaining means, the spring guide can be more satisfactorily fixed.

  FIG. 1 is a perspective view of a stapler according to the present invention, FIG. 2 is a perspective view seen from the back with the handle cover of the stapler removed, and FIG. 3 is an enlarged view of a main part. In these drawings, reference numeral 1 denotes a base member. A paper placement surface 1a for placing the paper a is formed on the front side of the base member 1, a clinch groove 2 is provided near the center, and a handle 3, a driver arm 4 and a magazine are provided at the rear end. 5 is rotatably provided.

  A handle support (support wall) 6 is formed facing the rear end portion of the base member 1, and a protruding shaft 7 protrudes from the outer upper portion of each handle support 6. A handle 3 shown in FIG. 2 is pivotably attached. The handle 3 is covered with a handle cover 3a.

  A magazine guide 8 that stands upward is fixed inside the handle support 6. A magazine 5 is attached to the inside of the rear end portion of the magazine guide 8, and a driver arm 4 is attached to the outside of the magazine guide 8 so as to be rotatable with respect to the shaft pin 10.

  As shown in FIG. 4, the magazine 5 is loaded with connected staples S, and a driver plate 11 (see FIG. 1) is fixed to the front end of the driver arm 4. It is attached so as to pass through the five launching portions 12.

  A booster mechanism (not shown) is provided between the handle 3 and the driver arm 4 so that a large driving force can be obtained even with a small force. Then, the handle 3 is rotated downward, the driver arm 4 is rotated downward, and the driver plate 11 is penetrated from the top to the bottom of the launching portion 12 of the magazine 5, whereby the connection sent to the tip of the magazine 5. The leading staple S1 of the staple S is ejected from the ejecting unit 12. The staple leg can pass through the paper a placed on the paper placement surface 1a, and can further bind the paper a by being pressed against the clinch groove 2 and bent. When the binding is completed, the handle 3, the driver arm 4 and the magazine 5 are returned to the initial state of FIG. 1 by a spring (not shown), and the connected staple S is sent to the launching portion 12 by one staple, and the next binding is performed. Be prepared.

  The magazine 5 is provided with a feeding mechanism for feeding the connected linked staples toward the launching unit and a staple guide for guiding the leading staple launching, but the description of the staple guide is omitted.

  The feed mechanism includes a pusher 13 that can be engaged with the rear end of the linked staple S housed in the magazine, a pusher spring 14 that presses the pusher 13 toward the driving side, and a pusher spring 14 in the pressing direction of the pusher 13. It comprises a spring guide 15 for guiding.

  The pusher 13 is a block-shaped member having a hollow inside, and a spring receiver 16 for the pusher spring 14 is formed at an intermediate portion. A through hole 17 through which the spring guide 15 passes is formed in the spring receiver 16. The pusher spring 14 is guided by a spring guide 15, the front end portion of which engages with the spring receiver 16, and the rear end portion of the pusher spring 14 engages with an upright piece 18 formed upright at the rear end portion of the magazine 5.

  The spring guide 15 is a shaft member made of synthetic resin and has a substantially square cross section, and the front end portion forming the other end portion is formed in a tapered shape 15b. The portion formed in the tapered shape 15b is inserted through the through hole 17 of the spring receiver 16 and then inserted and held in the shaft hole 20 of the upright piece 19 which is formed upright on the front end side of the magazine 5. The rear end of the magazine 5 is fixed to an upright piece 18 of the magazine 5. And the rear-end part of the spring guide 15 is being fixed by the following structure.

  That is, as shown in FIGS. 5 to 7, an engagement groove 21 is formed at the tip of the upright piece 18 at the rear end of the magazine. The end 22 on the opening side of the engaging groove 21 is narrowed to the inside, whereby the groove width of the engaging groove 21 is narrowed on the opening side. On the other hand, the rear end portion 15a of the spring guide 15 is formed to be larger than the engagement groove 21, and a two-pronged portion 23 is formed. Further, engagement step portions 24 are formed on both outer side surfaces of the front crack portion 23, and a concave groove 26 is formed in the lower portion. The concave groove 26 is formed to be continuous with the engagement step portion 24.

  When the spring guide 15 is fixed to the magazine 5, the spring guide 15 is inserted into the pusher spring 14, and the front end of the spring guide 15 is passed through the through hole 17 of the spring receiver 16 of the pusher 13, so that the shaft hole of the front standing piece 19 of the magazine 5 is inserted. 20 is inserted and held. Then, the front crack portion 23 at the rear end portion of the spring guide 15 is pushed into the engagement groove 21 of the rear standing piece 18 of the magazine 5. At this time, the cracked portion 23 is pushed in so as to be closed inside, and the engaging step portion 24 is press-fitted inside the engaging groove 21. And when it is pushed deeply into the engaging groove 21, the tip crack part 23 is expanded by intrinsic elasticity, and the concave groove 26 engages so as to hold the groove bottom 25 of the engaging groove 21 of the upright piece.

  According to the spring guide fixing structure, the tip crack portion 23 of the spring guide 15 expands by elasticity when it is deeply pushed into the engagement groove 21, so that the spring guide 15 cannot move in the left-right direction in a normal state. Further, since the groove width of the engagement groove 21 is narrowed on the opening side by the upper end portion 22, the spring guide 15 rises when the tip crack portion 23 of the spring guide 15 is pushed deeply into the engagement groove 21 by this retaining means. It is possible to effectively prevent the piece 18 from coming out of the opening end of the engagement groove 21.

  Further, with respect to the forward movement of the spring guide 15, the engagement step portions 24 on both outer sides of the front crack portion 23 are engaged with both side portions of the engagement groove 21 to prevent the spring guide 15 from moving in the left-right direction. Furthermore, since the concave groove 26 of the spring guide 15 is engaged so as to hold the groove bottom 25 of the engaging groove 21 of the upright piece 18, the back-and-forth movement of the spring guide 15 can be prevented stably and effectively.

  Further, the spring guide 15 is made of synthetic resin and can be easily and inexpensively manufactured by injection molding, and the engaging groove 21 of the magazine 5 may be press-molded in advance, and the spring guide 15 is formed in the engaging groove 21. In order to fix, the rear end portion of the spring guide 15 is simply pushed in with a slightly strong force. Therefore, the mounting structure for fixing the spring guide 15 to the magazine 5 can be simplified, the assemblability of the spring guide 15 can be improved, and the cost for fixing the spring guide can be reduced. In addition, when replacing or repairing the pusher spring 14, it is only necessary to pull out the spring guide 15 from the engagement groove 21, so that the operation is simple, and even if the spring guide 15 is repeatedly attached and removed for replacement, maintenance, etc. It will not be damaged or deformed.

  Furthermore, it is necessary to insert the spring guide 15 into the through hole 17 of the spring receiver 16 and the shaft hole 20 of the front standing piece 19 of the magazine 5 where it is difficult to visually check the front end side of the spring guide 15. Since the front end side of the spring guide 51 is formed in the tapered shape 15b, the spring guide 15 can be easily assembled. As a result, it is possible to obtain a spring guide that can be easily attached and detached on both the front end side and the rear end side of the spring guide 15.

It is a perspective view of one embodiment of a stapler concerning the present invention. It is the perspective view which looked at the state which removed the handle cover of the above-mentioned stapler from the back side. It is an enlarged view of the principal part of the said stapler. It is sectional drawing which shows the principal part inside a magazine. It is a longitudinal cross-sectional view which shows the fixing structure of a spring guide. FIG. 6 is a plan view of FIG. 5. It is explanatory drawing which shows the rear end of the said magazine.

Explanation of symbols

5 Magazine 12 Launching portion 13 Pusher 14 Pusher spring 15 Spring guide 18 Standing piece 21 Engaging groove 23 Tip cracking portion

Claims (2)

A pusher provided in a magazine having a storage space for linked staples and having a leading staple punching portion at the leading end thereof, and a pusher that is engageable with the trailing end of the stored staple, and presses the pusher toward the punching portion side. In the spring guide fixing structure of the stapler magazine, which includes a pusher spring and a spring guide for guiding the pusher spring in the pressing direction of the pusher, and fixes one end of the spring guide to the standing piece at the end of the magazine.
An engagement groove is formed at the tip of the upright piece,
The spring guide is made of synthetic resin, and one end portion thereof is formed larger than the engagement groove, and the one end portion is divided into two to form a tip crack portion, and the engagement groove of the standing piece is formed in the tip crack portion. A spring guide fixing structure for a magazine of a stapler, characterized in that a concave groove that engages with the groove bottom of the stapler is formed.   2. The spring guide fixing structure for a stapler magazine according to claim 1, further comprising a retaining means for preventing the spring guide from slipping out from the open end of the engaging groove of the standing piece.

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