CN1047752C - Configuration for paper punch pin - Google Patents

Abstract

A punch for punching holes in a stack of sheets of paper having a V-shaped groove with a height based on the thickness of the stack and the forces necessary to drive the punch pin of the punch through the stack of paper.

Description

Paper punch pin

The present invention relates to the punch pin of paper puncher

Nonplanar punch pin has been suggested and has obtained application (U.S.Patent Nos.4,257,300,4,449,436 and 4,763,552) in the paper puncher device.Though this class punch its performance when using is satisfactory, because there is design defect in the configuration of its punch pin, therefore makes the paper that is cut produce low opening in use easily and laminate phenomenon along cutting edge, not smooth from causing cutting.

The punch pin that the purpose of this invention is to provide a kind of improved paper puncher, the power that it applies in the time of can reducing to bore a hole, thus overcome the existing in prior technology defective.

According to a kind of paper punch pin provided by the invention, comprising:

A) framework;

B) have the perforating die in punch die hole;

C) be positioned at the frame aperture of aliging on the described framework with above-mentioned punch die hole;

D) frame parts comprises described frame aperture and the space that is positioned on the described punch die, is used to limit have the quires hole that its thickness equals perforated quires maximum ga(u)ge;

E) be fixed in punch pin drive unit on the framework;

F) a slidably punch pin drift that is arranged in described frame aperture, it has body part and the relative first configuration end and the second configuration end;

ⅰ) engagement of described first configuration end and drive unit is so that make the motion of described drift generation to the punch die hole;

ⅱ) the second configuration end of described drift passes the first configuration end engagement that moves upward and driven by drive unit from quires hole and punch die hole;

It is characterized in that:

A) shape of the described second configuration end is restricted to the inverted v-shaped groove that has following cutting edge and be provided with the last arcuate part of predetermined radii;

B) predetermined of the described groove of qualification between described cutting edge down and described arcuate surface;

The maximum height of the described groove between C) from the cutting edge to the arcuate surface is greater than the predetermined altitude in described quires hole.

The maximum height of described groove is the twice of the predetermined altitude in described quires hole.

The punch pin of the lever displacement punch of certain thickness paper gang punch is comprised according to provided by the invention being used for, one body part, has the second folded configuration end of first end that drives by leverage and the paper of boring a hole under pressure, this second configuration end comprises, the groove in a V-shaped space that is limited by lower end cutting edge and upper end arcuate part; Described arcuate part has a radius; With the degree of depth from the second configuration end to arcuate part of described groove be the folded thickness of paper 0.7-2 doubly.

According to punch pin provided by the invention, wherein said radius is not less than 0.015 inch.

According to punch pin provided by the invention, wherein said radius is not more than 0.03 inch.

According to punch pin provided by the invention, wherein the space of the groove of punch pin wants enough big, to prevent at any time to laminate the phenomenon that contracts along the contingent paper of cutting edge.

Punch pin of the present invention had with respect to the size and the configuration of the V-type groove of perforation paper, and its groove depth changes with the folded thickness of paper.Preferably the degree of depth of groove is equal to or greater than the folded thickness of perforation paper.

The groove depth of punch pin of the present invention is determined by the operation and the pressure of lever punch and the folded thickness of paper of boring a hole.

Fig. 1 is the side view of punch of the present invention, has wherein shown the configuration of punch pin;

Fig. 1 a is the part zoomed-in view of the punch pin of punch of the present invention;

Fig. 1 b is the bottom view of the punch pin of punch shown in Fig. 1 a;

Fig. 2 is the embodiment of first kind of punch pin configuration perforation of the present invention paper;

Fig. 2 a is similar to Fig. 2, shows the punch pin folded bottom of paper of having bored a hole;

Fig. 2 b is similar to Fig. 2 a, shows bored a hole the below of the folded bottom of paper of punch pin;

Fig. 2 c is pressure and the curve of perforation to bottom offset;

Fig. 3 is the second embodiment of the present invention, shows that the punch pin groove depth is the twice of the folded thickness of paper;

Fig. 3 a is similar to Fig. 3, shows the punch pin folded bottom of paper of having bored a hole;

Fig. 3 b is similar to Fig. 3 a, shows bored a hole the below of the folded bottom of paper of punch pin;

Fig. 3 c is pressure and displacement curve.

Referring to Fig. 1,1a, 1b and Fig. 2, paper puncher 10 has the punch pin 14 of framework 11, band cylindrical outer surface 14s and the v type groove 14g of band punch die 12, hole 11a, 11b that this punch pin 14 passes on the framework move up and down, and enter punch die hole 12a bottom in its displacement.Framework 11 comprises that also one has the framing component 13 of one of hole 11a, 11b on the framework and the space on the punch die 12, and this space boundary one has the quires hole of (SH) height, and described height (SH) equals to be perforated the folded maximum ga(u)ge of paper of machine perforation.From punch pin bottom 14t to its topmost the distance of arcuate part 14cs be the degree of depth GH of the groove 14g of punch pin.The upper end of punch pin is 14u.The upper end of punch pin is 14u.The lower end 14t of punch pin has circular cutting edge 14ce.As shown in the figure, the upper strata of the folded s of paper is ts, and bottom is bs, and the folded thickness of paper is sh.The groove 14g of punch pin has one by bottom 14ce with to have radius be the SPACE V that the top arcuate surface 14cs of R is limited.Also shown the spanner that rotates around tip axle P among the figure.That uses in radius R and the standard mechanical technical field is the same little.Radius R should be less than 0.031 inch, under the situation of considering wearing and tearing, preferably less than 0.015 inch.

Referring to Fig. 2 and 2a-c, the groove depth GH shown in the figure is 1.4GH less than the folded folded thickness SH of thickness paper of paper.When punch pin 14 descended, along with the pressure increase of the folded S of relative paper, its cutting edge 14ce produced paper scrap 18.

Referring to Fig. 3 and 3a-c, shown in the second embodiment of the present invention, wherein groove depth GH is the twice of the folded SH thickness of paper, when perforation, can run into the folded resistance of paper because be used for the groove of the punch pin of perforation on paper is folded on the punch, such as the folded thickness of perforation paper is the 0.03-0.5 inch, this just needs the degree of depth GH of the groove of punch pin can promptly take into account the length that (1) punch pin moves, and also considers (2) stress that punch stood simultaneously.

Because the punch pin parts have the lever spanner, so stress is not problem, groove depth GH preferably equals the folded thickness SH of paper.Punch pin 14 must move enough distances so that the arcuate part 14cs of groove can contact with the top TS of the folded s of paper, make paper scrap 18 shift out the folded S of paper up to entering the punch die hole continuing to move down thus, and be moved further advance punch die 12 paper scrap in the punch pin groove is discharged.Arcuate part 14cs will move 0.015 inch at least.

When punch pin 14 moves than short distance and stress when being not problem, groove depth GH can be more shallow.

Claims (2)

1. paper punch pin comprises:

A) framework;

B) have the perforating die in punch die hole;

C) be positioned at the frame aperture of aliging on the described framework with above-mentioned punch die hole;

D) frame parts comprises described frame aperture and the space that is positioned on the described punch die, is used to limit have the quires hole that its thickness equals perforated quires maximum ga(u)ge;

E) be fixed in punch pin drive unit on the framework;

F) a slidably punch pin drift that is arranged in described frame aperture, it has body part and the relative first configuration end and the second configuration end;

ⅰ) engagement of described first configuration end and drive unit is so that make the motion of described drift generation to the punch die hole;

ⅱ) the second configuration end of described drift passes the first configuration end engagement that moves upward and driven by drive unit from quires hole and punch die hole

It is characterized in that:

A) shape of the described second configuration end is restricted to the inverted v-shaped groove that has following cutting edge and be provided with the last arcuate part of predetermined radii;

B) predetermined of the described groove of qualification between described cutting edge down and described arcuate surface;

The maximum height of the described groove between C) from the cutting edge to the arcuate surface is greater than the predetermined altitude in described quires hole.

2. punch pin according to claim 1 is characterized in that, the maximum height of described groove is the twice of the predetermined altitude in described quires hole.

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