JPS64297Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a staple driving device of a type that drives a U-shaped staple toward a clincher member fixed to a base portion and bends the legs of the staple with the clincher.

(Prior Art) As shown in Fig. 2, a staple driving device is provided with a clincher for bending the staple legs on the upper surface of a base portion, and a movable part equipped with a driving device at the rear is rotatably pivoted. The materials to be stapled are held between the base portion and the movable lower surface of the driving device, and staples are driven out by the downward movement of the driver to staple the materials. However, in the above structure, the tip of the leg of the staple that has penetrated the material to be stapled comes into contact with the bending groove of the clincher immediately after passing through, and receives a reaction force from the bending groove. At this time, the part of the leg of the staple located in the material to be stapled is
Since the legs are held by the material to be bound, the legs are bent between the lowermost surface of the material to be bound and the portion extending to the tip. The portion L1 of the staple leg that protrudes through the material to be stapled is bent by the force acting in the bending direction of the reaction force of the clincher generated by the pressing force of the driver. Here, since L1 is short, a large pressing force from a driver is required for bending. For this reason, a drive source that could produce a large amount of force was needed.

(Technical Problem) The present invention provides a device that reduces the load applied to the drive mechanism that drives the driver by reducing the pressing force generated when the staple legs are bent, and the device is made smaller. The technical challenge is to do so.

(Means for Solving the Problems) Therefore, the present invention provides a staple driving device of a type in which the legs of the staple are bent by the clincher that is driven toward a clincher provided with U-shaped staples, and in which the legs of the staple are bent by the clincher. A stepped portion is provided at least in part to form a space between the lower surface of the material to be bound and the groove of the clincher. It is characterized by being placed in a position where it is sandwiched between the two.

(Description of Embodiment) The present invention will be explained based on FIGS. 1, 3, and 4. FIG. Convex portions 4, 4 are integrally provided on the clincher 2 on both sides of the leg bending groove 3 of the staple. This convex part 4,4
During binding, the upper surface is in a position opposite to the lower surface 8 of the movable part 7 of the staple driving device 6 with the paper 9 interposed therebetween. The staple 11 is moved downward toward the paper 9 by the driver 10, which is a driving member of the driving device 6, and is disconnected from the following staple. The leg tips 12 of the staple then abut and penetrate the paper 9 and abut the grooves 3 of the clincher. In this state, the paper 9 on the leg tip 12 side of the staple
The part that penetrates the groove 3 and the protrusion 4 of the clincher.
The thickness is L2, and when a load is continuously applied to the staple 11 due to the downward movement of the driver 10, a reaction force is received from the contact part with the groove 3 of the clincher, and the direction of the reaction force is to bend the legs. Due to the component force, the tips 12, 12 of both legs are bent in a direction toward each other. The legs 13 of the staple to be bent here are longer than the conventional ones by the height A of the convex portion 4 and protrude from the bottom layer of paper 14, so that the legs 13 of the staple can be easily bent.

The height A of the convex portion 4 is the height A of the staple leg 13 when the maximum number of sheets that the staple can bind is bound.
This is the height at which the bending direction is at least parallel to the bound paper 9 or in the direction toward the paper area by the groove 3 of the clincher. The relationship between the height A of the convex portion 4 and the bending of the staple leg will be explained with reference to FIGS. 4a and 4b. When the height A of the convex portion 4 is large a, the legs 13 of the staple that penetrate the paper 9 when the maximum number of sheets are stapled are not sufficiently bent by the grooves 3 of the clincher, and the stitching operation is completed. The tips 12, 12 separate from the bottom layer of paper 14, causing problems such as injury to workers etc. due to the protruding tips 12, 12, or damage to the documents below when stacking bound documents. There is a fear. When the height A of the convex portion 4 is small (b), the leg tip 12 of the staple faces toward the lowest layer of paper 14, and the above-mentioned problem does not occur.

FIG. 1b shows a second embodiment of the present invention, in which a recess 15 is provided in the clincher, and a groove 3 of the clincher is arranged in the recess 15.
The surface of the clincher 2 near 5 faces the lower surface of the movable part 7 when it is lowered, and the paper 9 is positioned between them. The depth A of this recess 15 is
It is equivalent to the height A of the convex portion 4 in the embodiment.

(Effects of the invention) As mentioned above, since the stepped portion is formed near the groove of the clincher, the tip of the leg of the staple that penetrates the paper immediately comes into contact with the groove of the clincher and is subjected to bending force. On the contrary, the tip of the leg after passing through the paper by the amount of step A advances and then comes into contact with the groove of the clincher and receives bending force, so the force required to bend the leg is small. This means that the load on the driver that presses the staples is reduced during clinching, making it possible to make the device smaller and lighter, and even with staples that do not have sufficient buckling strength, the clincher can Even if the legs are subjected to the load of bending the legs caused by the collision of the tips of the legs, the legs will start bending with a small load, so the legs will be able to bend and bind the paper without the load reaching the point of buckling. As a result, spelling work can be performed reliably, and work interruptions due to fatigue can be eliminated, making it possible to improve work efficiency.

[Brief explanation of the drawing]

1A and 1B are explanatory diagrams of the main parts of the clinch load reducing device in the staple driving device according to the present invention, in which a is a first embodiment, b is a second embodiment, and FIG. 2 is a conventional FIG. 3 is an explanatory view of when the staple driving device according to the present invention starts bending the staple legs; FIG. FIG. 2 is an explanatory diagram of the relationship between the height and the bending of the staple legs, where a shows a case where the height of the stepped portion is large, and b shows a case where the height of the stepped portion is small. DESCRIPTION OF SYMBOLS 1... Base part, 2... Clincher, 3... Clincher groove, 4... Convex part, 15... Concave part, A...
...Height of the convex part and depth of the concave part.

Claims (1)

[Scope of utility model registration request] In a staple driving device of the type that drives a U-shaped staple toward a clincher provided in a base portion and bends the legs of the staple by the clincher, a stepped portion is provided in at least a part of the outer peripheral area surrounding the groove of the clincher, and A space is formed between the lower surface of the material and the groove of the clincher, and the stepped portion is located at a position where the material to be bound is sandwiched between the two, facing the vicinity of the staple exit of the driving device during binding. Clinch load reduction device for staple driving equipment.