JPH0644609Y2 - Self-forming stapler staple leg detector - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION In the present invention, both legs of a staple are properly formed in a self-forming stapler in which a straight needle is formed into a U-shaped needle (hereinafter referred to as staple) and then the staple is driven into a staple binding material. The present invention relates to a staple leg detecting device that detects whether or not a staple leg is present.

[0002]

2. Description of the Related Art In a self-forming stapler, in particular, in a self-forming electric stapler, both legs of the staple must be properly formed as a prerequisite for properly driving the staple into a staple binding material and properly clinching. . For example, if there is a difference in the length of the left and right legs of the staple, or if one of the left and right legs is not formed at a right angle to the crown portion of the staple, the staple is struck by the feed error and the staple driving portion A staple jam in which the staples are not ejected occurs, or even when the staples are ejected, the longer left and right legs of the staples buckle when the staple is stapled. When such a problem occurs, an accident occurs in which the staples break the document. Therefore, it is extremely beneficial to take measures capable of reliably preventing jamming or buckling of staples before staple driving, in an office or in a place where a lot of documents are used.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to self-form a stapler for removing a staple forming defect which causes a blank driving, jamming and buckling of staples before driving a staple formed from a straight needle. The present invention provides a staple leg detecting device.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a staple sheet formed by arranging and connecting a large number of straight staples in a sheet shape is sent to a staple forming and driving device, and the straight staples are formed into staples. In a self-forming stapler that is driven into a staple binding material, a pair of detectors for detecting the presence or absence of a staple leg are arranged opposite to each other at lower ends on both sides of an anvil that receives a staple crown portion at the time of forming a staple or at predetermined positions in the vicinity thereof. A staple leg detecting device is provided.

[0005]

According to the present invention, immediately after forming the staples into straight staples and before driving the staples,
Since defective forming of staples is detected by detecting whether or not the tips of the staple legs are present at the reference position, it is possible to eliminate causes such as staple firing, jamming, and buckling. Therefore, it is possible to prevent a document from being damaged due to staple misclinching.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to FIGS. As shown in Figure 1,
The self-forming type stapler has a main body 2 that guides a staple sheet in which a large number of straight needles are arranged and connected to each other toward a staple driving portion, and a staple forming plate 1 is vertically movable. A staple forming plate 1 having a substantially rectangular forming groove 3 extending upward in the axial direction, the staple forming plate 1, an anvil 4 that cooperates with the staple forming plate 1 to form a straight needle into a staple, and an anvil 4. A holder on the rear side for pushing the staples into the driving guide groove 6 of the face plate 4a, a T-shaped staple driving plate 8, a staple forming plate 1 and a staple driving plate 8 which are integrally held and moved up and down. 9 and 9 are included.

As shown in FIG. 2, the anvil 4 has an anvil core 5 having a substantially rectangular cross section at its central portion.
Have. Straight needles are formed into staples on the upper surface of the anvil core 5 and on both ends in the width direction thereof. The width of the anvil core 5 is the inner width of the crown of the staple to be formed. The anvil 4 has straight needle end support portions 10 and 11 on both sides of the anvil core 5 for supporting the left and right ends of the straight needle. The upper surfaces 10 a and 11 a of the straight needle end support portions 10 and 11 are flush with the upper surface 5 a of the anvil core 5.
Between the anvil core 5 and the straight needle end support portions 10 and 11, an arc-shaped pusher passage 12, through which the pusher 7 passes,
12 are formed. The upper surface 10a of the straight needle end support portion 10
Overhangs are provided with overhang portions 10b and 11b for preventing the straight needle from escaping upward.

A portion of the anvil core 5 projecting forward of the straight needle end support portion 10 serves as a receiver during staple formation. A lower end flange 13 is provided at a lower end portion of the anvil core 5 at a portion projecting forward of the straight needle end support portions 10 and 11. The lower end flange 13 has staple leg advancement guide surfaces 14 and 15 on both sides of the anvil core 5, which are gradually lowered from the rear side to the front side and are substantially cylindrical surfaces. Further, staple leg detectors 16 and 16 composed of touch sensors such as limit switches or proximity switches are provided at opposite portions of both side surfaces of the anvil core 5 adjacent to the staple leg advancement guide surfaces 14 and 15. There is.

When the staple forming plate 1 and the anvil 4 work together to form a straight staple of a staple sheet into a staple,
The straight needle includes the upper surface 5a of the anvil core 5 and the straight needle end support 10
While being supported by the upper surface 10a of the anvil core 5 and pushed out to the front part of the anvil core 5, the straight needle exits forward from the straight needle end support portion 10.
In this state, the staple forming plate 1 is lowered, and the straight needle is formed in a U shape by the left and right edges 5b and 5c of the upper surface 5a of the anvil core 5 and the left and right edges 3a and 3b of the forming groove 3 of the staple forming plate 1. Begins to be molded into. As a result, the right and left staple leg equivalent portions of the straight needle are bent at right angles to the straight staple equivalent portion of the staple while rotating from the horizontal position to the vertical position in proportion to the descent of the staple forming plate 1. It Thus, if the left and right leg portions of the formed staple have the same length and are in the same plane as the staple crown portion, the left and right staple leg detectors 16, 16 detect the presence of the staple leg portions. , Send a detection signal to the electric stapler operating circuit. As a result, the electric stapler actuating circuit is actuated, the staple driving plate 8 is lowered, and the staples are correctly driven into the staple binding material.

As shown in FIG. 3, the staple leg detector 16 may be constituted by a proximity switch arranged directly below the leg portion of the reference formed staple. In addition, as shown in FIG. 4, the staple leg detector 16 detects the staple leg portion in the passage through which the staple serving as a reference passes from the anvil 4 to the driving guide groove 6 of the face plate 4a. It may be configured by a proximity switch arranged at a position close to the outer side surface.

In a stapler in which straight staples of a staple sheet can be driven up to the last one as a staple, the staple leg detecting device of the present invention functions as a stapleless detector.

[Brief description of drawings]

FIG. 1 is a perspective view of a self-molding stapler equipped with a staple leg detecting device according to the present invention, showing a main part assembly.

FIG. 2 is a perspective view of the staple leg detecting device of FIG.

FIG. 3 is a perspective view of a staple leg detecting device according to another embodiment of the present invention.

FIG. 4 is a perspective view of a staple leg detecting device according to another embodiment of the present invention.

[Explanation of symbols]

 1 Staple forming plate 4 Anvil 5 Anvil core 8 Staple driving plate 16 Staple leg detector

Claims (1)

[Scope of utility model registration request] 1. A self-assembling method in which a staple sheet formed by arranging and connecting a plurality of straight needles in a sheet shape is sent to a staple forming and driving device, the straight needles are formed into staples, and the staples are driven into a staple binding material. In a stapler, a pair of detectors for detecting the presence or absence of staple legs are arranged opposite to each other at a predetermined position on the lower ends of both sides of the anvil that receives the staple crown portion during staple formation or in the vicinity of the anvils. apparatus.