JPH0448954Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a perforator for punching holes for binding in pieces of paper etc. using a perforation pin.
In particular, it relates to the mounting structure of a spring member for biasing the pin.

(Prior art) A conventionally known spring mounting structure for this type of perforator is, for example,
As disclosed in the above publication, a compression coil spring is wound around a drilling pin shaft that is supported and guided by a pair of support walls provided corresponding to a drilling opening, and a compression coil spring is wound between the support walls. , a shaft stopper member is attached to the pin shaft so that the biasing force of the compression coil spring is applied to the pin.

(Problems with the conventional technology) In the structure of the prior art described above, the assembly process, especially the process of attaching the compression coil spring and the shaft stopper member, must be performed while constantly receiving the elastic force of the spring, which is extremely difficult and time-consuming. It was something that required. That is, the compression coil spring is compressed and held and inserted and supported between a pair of guide walls, and after the pin is inserted, the spring is retracted by the elastic force and a shaft stopping member is attached to the pin shaft.
In addition to the work being done in a narrow space, the spring force is constantly acting on the assembly work.

(Technical Problem of the Invention) Therefore, an object of the present invention is to provide a perforator which is not affected by the elasticity of a spring during assembly work and which can be assembled very easily.

(Technical Means of the Invention) In order to solve the above-mentioned problems, the present invention consists of a spring member consisting of a plate-like spring piece formed in a substantially U-shape, and an annular groove is formed in the punching pin, and the U-shaped A notch formed at one end of a shaped spring member is engaged with the annular groove between a pair of upper and lower support wall members, and the other end is resiliently supported by the lower support wall member. It is.

(Effect of the invention) The notch of the spring piece engages the annular groove formed in the pin shaft between the pair of guide walls of the drilling pin to prevent it from falling off, and the spring piece is prevented from falling off between the pair of guide walls. Since the pin is resilient, it is supported by its elasticity, and furthermore, the resilient force of the spring piece acts on the pin, urging it in a predetermined direction, and one end of the spring member engaged with the pin shaft The upward movement of the pin is restricted by contacting the upper wall member.

(Embodiments of the invention) Examples of the invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a base member having an opening 2 for drilling at its front end, and vertical walls 3, 3 are integrally formed on both sides of the base member. The vertical wall 3,3
A paper piece insertion groove 4 is formed which is open at the front edge from the front end to the approximately central portion. A support member 6 for vertically movably supporting a drilling pin 5 is fixed to the upper surface of the base member 1 by a burred edge formed on the base member 1. An upper wall member 7 and a lower wall member 8 are formed in the front part of the support member 6 as a pair of support wall members for slidingly guiding the drilling pin 5 in the vertical direction. A drilling pin 5 inserted into guide holes 7a and 8a provided in alignment with the drilling opening 2 is supported. An operation handle 9 for pressing the punching pin 5 is rotatably attached to the upper part of the front end of the vertical walls 3, 3 of the base member 1 by means of a pivot shaft 10, and the operation handle 9 is pressed down. Accordingly, a cam member 11 provided on the lower surface of the operating handle 9 is configured to operate the punching pin 5 downward, thereby piercing a piece of paper placed in the paper piece insertion groove 4. has been done. Further, on the back side of the bent portion of the operating handle 9 facing the front ends of the vertical walls 3, 3 of the base member 1, there is a rotational movement that restricts the rotation of the operating handle when the operating handle is not operated by contact with the base member 1. A regulating portion 9a is provided.

Reference numeral 12 denotes a spring member that elastically urges the punching pin 5 upward. The spring member 12 is composed of a plate-like spring piece formed in a substantially U-shape, and the upper end thereof is accommodated in an annular groove 5a formed in the shaft portion of the punching pin 5, so that the punching pin 5 and the spring member are connected to each other. A cutout portion 12a is formed to connect the portions 12 to 12. The notch 12
a is open toward the edge of the spring member 12, and the width of the open portion is set slightly smaller than the outer diameter of the annular groove 5a of the perforation pin 5, thereby making the spring member 12 and the perforation This prevents pin 5 from being unintentionally disengaged.

The other end of the spring member 12 has a notch 12 that accommodates the outer periphery of the burring portion forming the guide hole 8a formed in the lower wall member 8.
b is formed. A guide slope 12a is further formed on the edge to facilitate insertion into the burring part.

The perforator having the above configuration is assembled in accordance with the following procedure. Guide holes 7 formed in the upper and lower wall members 7 and 8 of the support member 6 fixed on the base member 1
a, 8a, and insert the annular groove 5a of the drilling pin 5 into the upper and lower wall members 7, 8a of the support member 6.
After placing the spring member 12 between the wall members 7 and 8, the spring member 12 is compressed against its elasticity and inserted from the rear between the wall members 7 and 8, using the opposing wall surfaces of the wall members 7 and 8 as guides, and the ends of each are cut. The notches 12a and 12b are fitted into the annular groove 5a and the burring portion of the lower wall member 8. The one notch 12a is connected to the annular groove 5a.
Since the diameter of spring piece 1 is set smaller than
It can be easily inserted by pushing in using the elasticity of step 2. In addition, in the embodiment, a notch 12b is also formed at the other end to engage the burring part of the guide hole 8a, but there is no particular need for this, and this end can be elastically attached to the lower wall member 8. It would be good if it was supported. After this, the operation handle 9
All assembly is completed by attaching it to the base member 1 with the pivot pin 10.

(Effects of the invention) As described above, according to the invention, a spring member can be formed by simply inserting a U-shaped spring piece between a pair of guide walls and inserting one end of the spring piece into an annular groove formed on a pin shaft. Since the assembly of the drilling pin is completed, there is no need to perform work against the elastic force of the spring as in the past, and it is also possible to grasp the center part of the U-shape and connect the opposing wall surfaces of the upper and lower wall members. Since it is simply inserted as a guide, there is no need to work in narrow areas, and the number of assembly steps can be greatly reduced, making it possible to provide a punch that is inexpensive overall.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing an exploded view of the same. 1...Base member, 2...Drilling opening, 5...
Punching pin, 5a... annular groove, 6... support member,
7... Upper wall member, 8... Lower wall member, 12...
Spring member, 7a, 8a...Guide hole, 12a, 12
b...Notch part.

Claims (1)

[Scope of utility model registration request] A punching pin that is slidable while being guided by a pair of upper and lower support wall members; a punching opening that punches a piece of paper or the like in cooperation with the punching pin that moves downward as the operating handle rotates; and a lower surface of the operating handle. a cam that engages with the drilling pin, an operating handle rotation regulating portion that limits rotation of the operating handle when the operating handle is not operated, and a spring member that biases the drilling pin upward. In the perforator, the spring member is constituted by a plate spring piece formed in a substantially U-shape, the perforation pin is formed with an annular groove, and a notch is formed at one end of the U-shaped spring member. A spring mounting structure for a perforator, characterized in that one end is engaged with the annular groove between the pair of upper and lower support wall members, and the other end is elastically supported by the lower support wall member.