JP4600348B2 - Shaft pin retaining structure - Google Patents

Description

  The present invention relates to a shaft pin retaining structure for preventing a shaft pin supporting a rotating member from coming out of the rotating member.

  For example, in a medium-sized stapler, a magazine guide is fixed between handle supports (support walls) formed opposite to an end portion of a base member, a driver arm (rotating member) is provided outside the magazine guide, and a magazine arm is provided inside. The magazine is arranged, and the driver arm and the magazine are rotatably supported on the shaft pin penetrating the magazine guide.

  As in the above stapler, in a configuration in which an appropriate rotation member is rotatably disposed on a shaft pin provided so as to be orthogonal to the wall surface direction of the wall provided in the base member, the rotation is performed like a binding operation. Each time the operation is repeated, a slight force is applied to the shaft pin in the axial direction, and the shaft pin moves little by little. If the shaft pin is left to move in the axial direction, the shaft pin will come out of the rotating member. Therefore, the shaft pin retaining structure for preventing the shaft pin supporting the rotating member from coming out of the rotating member. Is required. In this case, conventionally, two retaining ring members such as E-shaped retaining rings are often used on both sides of the shaft pin.

  That is, an annular groove is provided in the circumferential direction in the vicinity of both end portions of the shaft pin, and a rotating member such as a driver arm is pivotally mounted. Is the method. The E-shaped retaining ring, which is one of the retaining ring members, is a substantially E-shaped metal thin plate, and is attached by pushing the claw portion into the annular groove.

  In this retaining system, when the shaft pin moves in one axial direction, the E-shaped retaining ring opposite to the moving direction interferes with a rotating member such as an inner driver arm, thereby preventing the shaft pin from coming out. The same applies when moving to the other axial direction.

  In addition to the above method, there is a method in which one of the shaft pins is molded with a header to form a stepped pin, and the shaft pin is fixed with one E-shaped retaining ring. As shown in Patent Document 1, one of the shaft pins is caulked with a header or the like so that the end portion has a large diameter and an E-type retaining ring is attached to the other end portion to prevent the shaft pin from coming out. Yes (see Patent Document 1, FIG. 13).

According to the above configuration, when the shaft pin moves in the direction of the large-diameter end, the E-type retaining ring on the opposite side of the moving direction interferes with the inner handle support to prevent the shaft pin from coming off. When moving to the position, the large-diameter end portion interferes with the inner handle support, so that it can be prevented from coming out.
JP 2005-138248 A

  However, in the method using two E-type retaining rings, both the parts cost, shaft pin grooving, and assembly time are burdened by two pieces, and one E-type retaining ring is used and one of the shaft pins is used. In the molding method, there is a problem that the cost of parts increases if there are not many production lots.

  The present invention solves the above-mentioned problems, and can fix the shaft pin with a single retaining ring member using a normal parallel pin, so that the cost of the parts and the assembly time can be reduced. It is an object to provide a method.

  The present invention solves the above problems, and in a structure in which a rotating member is pivotally attached to an axial pin provided so as to be orthogonal to a wall surface direction of the wall on one side of a wall standing upright on the base member, It is an object of the present invention to provide a shaft pin retaining structure that can effectively prevent the shaft pin from coming out of the bearing hole of the rotating member.

In order to solve the above-mentioned problem, in the invention according to claim 1, an axial pin is arranged on one side of a wall formed upright on the base member so as to be orthogonal to the wall surface direction of the wall, and the axial pin is appropriately rotated. In a shaft pin retaining structure in which a moving member is pivotally attached to prevent the shaft pin from coming out of a bearing hole of the rotating member, an annular groove formed in the shaft pin is formed with an annular groove formed in the shaft pin. The shaft pin is disposed between the moving member, the edge of the wall is disposed at a position covering the retaining ring member, and a part of the edge is cut out in a groove shape so that the shaft pin is in the axial direction. And a retaining portion that interferes with the retaining ring member when the retaining ring member moves along the axial direction of the axial pin .

  The invention according to claim 2 is characterized in that, in claim 1, the wall provided on the base member is a handle support in the stapler, and the rotating member is a driver arm provided with a staple driving driver. To do.

  According to the first aspect of the present invention, the annular groove formed in the shaft pin is disposed between the wall and the rotating member, the retaining ring member is engaged with the annular groove, and the shaft pin is provided on the wall. Is formed so as not to interfere with the shaft pin when it moves in the axial direction, so that the shaft pin can be easily inserted.

  In addition, since the retaining ring member is formed so as to interfere with the retaining ring member when the retaining ring member moves along the axial direction of the shaft pin, the retaining ring member simultaneously moves when the axial pin moves along the axial direction. Also move in the same direction, and the pivot member or wall interferes with the retaining ring member, so that the shaft pin can hardly move in the axial direction.

  In this way, the shaft pin can be fixed with one retaining ring member, and the cost of both the parts cost and the assembly time can be reduced.

  According to the second aspect of the present invention, when the magazine and the driver arm are respectively arranged on the inner and outer sides of the magazine guide, and the shaft pin is inserted from the outside with the respective bearing holes aligned, the handle support is prevented from coming off. Since the portion is formed so as not to interfere with the shaft pin, the shaft pin can be inserted easily.

  Further, there is a possibility that the shaft pin moves along the axial direction while the sheet binding operation is repeated. At this time, the retaining ring member moves in the same direction at the same time, but the driver pin or the handle support interferes with the retaining ring member no matter which direction the shaft pin moves, so the shaft pin can move almost in the axial direction. Can not.

  Therefore, the shaft pin can be fixed with one retaining ring member, and both the cost of the parts and the assembly time can be reduced.

  FIG. 1 is a perspective view of a stapler according to the present invention, FIG. 2 is a side view of the stapler with a handle cover removed, and FIG. 3 is a perspective view of the stapler as viewed from the rear side. 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.

  As shown in FIGS. 3 to 5, a handle support (support wall) 6 is formed to face the rear end portion of the base member 1, and a protruding shaft 7 is formed to protrude from the upper outer portion of each handle support 6. A handle 3 shown in FIGS. 1 and 2 is pivotally attached to the projecting shaft 7. The handle 3 is covered with a handle cover 3a (see FIG. 1).

  4 and 5, a U-shaped magazine guide 8 is fixed inside the handle support 6 so as to open upward. A bearing hole 9 is formed at the rear end of the magazine guide 8, and a shaft pin 10 passes through the bearing hole 9. The shaft pin 10 is provided so as to be orthogonal to the surface direction of the handle support 6. A magazine 5 is attached to the inside 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.

  The magazine 5 is loaded with connected staples formed by connecting a large number of U-shaped staples, and a driver plate 11 (see FIG. 1) is fixed to the front end of the driver arm 4. The magazine 5 is attached so as to pass through the launching portion 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, when the handle 3 is rotated downward, the driver arm 4 is rotated downward to pass the driver plate 11 from the top to the bottom of the launching portion 12 of the magazine 5 so as to be sent to the tip of the magazine 5. The leading staple of the linked staples is ejected from the ejecting unit 12. The staple legs penetrate the paper a placed on the paper placement surface 1a, and are further pressed against the clinch groove 2 to bend, thereby binding the paper a. When the binding is completed, the handle 3, the driver arm 4 and the magazine 5 are returned to the initial state shown in FIG. Is done.

  Although not shown, the magazine 5 is provided with a feeding mechanism and the like for feeding the connected connected staples toward the launching unit.

  Next, the shaft pin 10 that rotatably supports the driver arm 4 and the magazine on the magazine guide 8 is configured not to come out of the driver arm 4.

  That is, as shown in FIGS. 4 to 6, one annular groove 13 is formed in one end portion of the shaft pin 10 in the circumferential direction. A magazine (not shown) is arranged inside the magazine guide 8 and a driver arm 4 is arranged outside the magazine guide 8, and the outside of the driver arm 4 in a state where the bearing holes 9 and 16 are aligned. The shaft pin 10 is inserted through the aligned bearing holes 9 and 16. At this time, the annular groove 13 of the shaft pin 10 is disposed between the inside of the handle support 6 and the outside of the driver arm 4, and an E-shaped retaining ring 14 as an example of a retaining ring member is attached to the annular groove 13. It has been. In this state, as shown in FIG. 7, the toe 15 of the E-shaped retaining ring 14 engages with the bottom of the annular groove 13 of the shaft pin 10, and the E-shaped retaining ring 14 cannot be detached from the annular groove 13.

  Next, a retaining portion 17 of the shaft pin 10 is cut out at an intermediate portion of the rear inclined edge portion 18 of the handle support 6. The retaining portion 17 is formed in a substantially “<” shape so as to retract from the position of the shaft pin 10, and does not interfere with the shaft pin 10 when the shaft pin 10 moves in the axial direction. When the retaining ring 14 moves along the axial direction of the shaft pin 10, the E-shaped retaining ring 14 overlaps and interferes. Note that the E-shaped retaining ring 14 has a shape of “E” and a part thereof is opened, and gradually rotates around the shaft pin 10 as the binding operation is repeated. No matter how the ring 14 rotates, it is formed in such a shape that a part of it always interferes.

  According to the above configuration, when the magazine and the driver arm 4 are respectively arranged on the inner and outer sides of the magazine guide 8 and the shaft pins 10 are inserted from the outside with the respective bearing holes 9 and 16 aligned, the handle support 6 Since the retaining portion 17 is formed so as not to interfere with the shaft pin 10, the shaft pin 10 can be easily inserted. If the stoppers 17 are formed on the handle supports 6 on both sides, the shaft pin 10 can be inserted from either the left or right side.

  In particular, the retaining portion 17 is formed in a relief groove shape for retracting the edge portion 18 of the handle support 6 from the shaft pin 10, and the side opposite to the relief is open. For this reason, the E-shaped retaining ring 14 can be easily engaged with the annular groove 13 of the shaft pin 10 through an appropriate jig from the open portion.

  Further, there is a possibility that the shaft pin 10 moves along the axial direction while repeating the binding operation. However, at this time, the E-shaped retaining ring 14 also moves in the same direction at the same time. Therefore, when the shaft pin 10 moves to the opposite side of the E-shaped retaining ring 14, the E-shaped retaining ring 14 engages with the side surface of the inner driver arm 4. To do. When moving to the opposite side, the handle support 6 is engaged. As described above, the driver pin 4 or the handle support 6 interferes with the E-shaped retaining ring 14 regardless of the direction of movement of the shaft pin 10, so that the shaft pin 10 can hardly move in the axial direction.

  As described above, the shaft pin 10 may be a normal parallel pin and can be fixed with one E-type retaining ring, and the cost of both parts and assembly can be reduced.

  In addition, the retaining portion of the handle support is not limited to that formed at the edge. For example, the handle support may be formed as a circular hole or an elliptical hole as long as there is no problem in attaching the E-shaped retaining ring.

  Further, the above-described shaft pin retaining structure is not limited to the stapler. For example, it can be applied to a punch for punching.

  Further, the retaining ring member is not limited to the E-shaped retaining ring, and a C-shaped retaining ring having a substantially C shape may be used.

It is a perspective view of one embodiment of a stapler concerning the present invention. It is a side view in the state where the handle cover of the stapler was removed. It is the perspective view which looked at the said stapler from the back side. It is the side view to which the handle | steering-wheel support part was expanded. It is the longitudinal cross-sectional view of the same part as FIG. 4, and the enlarged view of the part. It is a cross-sectional view of the same part as FIG. It is an enlarged view of the side surface of the state which cut | disconnected the axial pin in the center of the annular groove.

Explanation of symbols

1 Base member 4 Driver arm 10 Shaft pin 13 Annular groove 14 E-type retaining ring

Claims (2)

A shaft pin is disposed on one side of the wall formed upright on the base member so as to be orthogonal to the wall surface direction of the wall, and an appropriate rotation member is pivotally attached to the shaft pin. In the structure for preventing the shaft pin from coming off from the bearing hole of the rotating member,
An annular groove formed in the shaft pin is disposed between the wall and the rotating member, and a retaining ring member is engaged with the annular groove,
The edge of the wall is disposed at a position that covers the retaining ring member, and a part of the edge is cut out in a groove shape to interfere with the shaft pin when the shaft pin moves in the axial direction. A shaft pin retaining structure characterized in that a retaining portion that interferes with the retaining ring member when the retaining ring member moves along the axial direction of the shaft pin is formed . 2. The shaft pin retaining structure according to claim 1, wherein the wall provided on the base member is a handle support in the stapler , and the rotating member is a driver arm having a staple driving driver.

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