Hole punches and paper punching devices

Abstract

To provide a piercing punch which enables easy and reliable piercing of a sheet.SOLUTION: A piercing punch 1 includes: a punch body 2 having a storage part 5 at a center of a tip formed with a blade edge 3; and a flexible pressing member 10 held in the storage part 5 so that a tip protrudes from an opening 5b of the storage part 5. The pressing member 10 is housed in the storage part 5 while forming a gap therebetween so that a tip can be buried in the storage part 5 by deflection. It is preferable to form the pressing member 10 in a columnar shape. It is preferable to form a fixing part 5a to be fitted with a base end part of the pressing member 10 at a bottom part of the storage part 5.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a hole punch and a paper punching device. [Background technology]

[0002] When a punch is inserted into a through-hole formed in a base to punch a hole in paper, there is a risk that the scrap punched out of the paper will not separate from the cutting edge of the punch but will rise with the punch, and will tend to stick to the back side of the base due to the influence of static electricity and the like, so methods for reliably removing the scrap from the cutting edge of the punch and the base have been studied.

[0003] For example, Patent Document 1 discloses that in a punching processing device that punches holes in paper by moving a punch pin back and forth relative to a punch die, a scraping member that scrapes punch residue from the punch pin is provided near the opening on the underside of the punch die. However, when attaching the scraping member to the underside of the punch die, it is necessary to precisely align it with the punch pin so that the tip of the scraping member can reliably scrape off the punch residue, which poses a problem that the attachment work of the scraping member can easily become complicated.

[0004] One known structure for removing punching waste adhering to the cutting edge of a hole-perforating punch is a jector punch in which a jector pin built into the punch is protruded by the elastic force of a coil spring to push off the punching waste adhering to the cutting edge (for example, Patent Document 2). However, when a jector punch is used to perforate paper, the jector pin hits the paper hard, making it difficult to punch the paper smoothly and potentially damaging the paper. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-200592 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-7686 Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a punch and a paper-sheet punching device that can easily and reliably punch holes in paper sheets. [Means for solving the problem]

[0007] The object of the present invention is to provide a cutting tool having a receiving portion at the center of the tip where the cutting edge is formed. cylindrical a punch body; and a flexible pressing member held in the housing portion so that a tip thereof protrudes from an opening of the housing portion, a tip end surface of the punch body is an inclined surface inclined in one direction with respect to an axis of the punch body, The pressing member is configured to bend and deform so that the tip can be embedded in the storage portion. Between the outer peripheral surface of the pressing member and the inner wall of the accommodating portion This is achieved by means of a gap-housed punch for perforating.

[0008] In this hole-piercing punch, the pressing member is preferably formed in a columnar shape, and a fixing portion is preferably formed at the bottom of the accommodating portion into which the base end of the pressing member is fitted.

[0009] The pressing member is preferably a foamed member having an Asker C hardness of 17 to 23.

[0010] Furthermore, the above-mentioned object of the present invention can be achieved by a paper punching device comprising the above-mentioned hole punch, a support member that supports the hole punch so that it can be raised and lowered, and a base having a through hole formed in a position opposite the hole punch, and which punches paper by placing paper on the base and inserting the tip of the hole punch into the through hole. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a hole punch and a paper punching device that can easily and reliably punch holes in paper. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a front view of a hole-piercing punch according to an embodiment of the present invention. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] 2 is a diagram showing the operation process of the paper-sheet punching device equipped with the hole-punch shown in FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a front view of a hole-piercing punch according to one embodiment of the present invention, and Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. As shown in Figs. 1 and 2, the hole-piercing punch 1 includes a punch body 2 and a pressing member 10.

[0014] The punch body 2 is formed in a cylindrical shape and has a housing portion 5 in the center of the tip where the cutting edge 3 is formed. The tip surface of the punch body 2 is an inclined surface that is inclined with respect to the axis L of the punch body 2. The housing portion 5 is a housing space concentric with the punch body 2, and a fixing portion 5a consisting of an upward-facing recess is formed in the center of the bottom, which is the upper side. A mounting hole 4 is formed in the center of the punch body 2, penetrating in a direction perpendicular to the axis L of the punch body 2.

[0015] The pressing member 10 is formed in a cylindrical shape, and is held within the housing 5 along the axis L of the punch body 2 by having its base end fitted and fixed to the fixing portion 5a via an adhesive or the like, with its tip end protruding downward from the opening 5b of the housing 5. The pressing member 10 may be shaped like a rectangular pillar, or may have a shape other than a pillar, such as a cone or frustum tapered toward the tip. The pressing member 10 is flexible, and a gap is formed between the outer peripheral surface of the pressing member 10 and the inner wall of the housing 5 so that the pressing member 10 can be flexibly deformed within the housing 5.

[0016] Although there are no particular restrictions on the amount of protrusion of the pressing member 10 from the opening 5b, it is preferable to set the amount of protrusion of the pressing member 10 appropriately so that the tip of the pressing member 10 can be buried in the accommodation section 5 due to the flexural deformation of the pressing member 10. In this embodiment, the amount of protrusion of the pressing member 10 is specified so that the plane including the tip surface of the pressing member 10 approximately coincides with the axial tip of the inclined opening 5b.

[0017] Figure 3 is an operating process diagram of a paper-sheet punching device 100 equipped with the above-described hole punch 1. As shown in Figure 3(a), the paper-sheet punching device 100 is equipped with the hole punch 1, a rod-shaped support member 20 that is inserted into the mounting hole 4 of the hole punch 1 and supports the hole punch 1 so that it can be raised and lowered, and a base 30 in which a through-hole 31 is formed in a position facing the hole punch 1. The hole punch 1 can be raised and lowered by the support member 20 either manually or automatically.

[0018] As shown in Figure 3(a), when a sheet of paper 40 is placed on the top surface of the base 30 and the punch 1 is lowered in the direction of arrow B, the tip of the punch 1 is inserted into the through-hole 31 as shown in Figure 3(b). As a result, the pressing member 10 is bent and deformed so that the tip of the pressing member 10 that is in contact with the sheet of paper 40 is buried in the storage section 5, and the cutting edge 3 cuts into the sheet of paper 40, generating punch waste 41.

[0019] The generated punching waste 41 descends together with the cutting edge 3 as the perforating punch 1 descends, but as shown in Fig. 3(c) , the deformed pressing member 10 returns to its original shape, and the punching waste 41 is pushed off from the cutting edge 3. As a result, the punching waste 41 that tends to stick to the through-hole 31 or the back side of the base 30 due to the influence of static electricity and the like can be reliably brushed off.

[0020] Examples of materials for the pressing member 10 include soft synthetic resin materials and rubber materials. Foamed materials, such as foamed resin materials and foamed rubber materials (e.g., chloroprene rubber sponge and silicone rubber sponge), are particularly preferred. By using a foamed material for the pressing member 10, the impact force acting on the paper 4 when the pressing member 10 contacts it can be reduced, ensuring reliable perforation without damaging the paper 4. When the pressing member 10 is a foamed material, if its Asker C hardness is too high, it may be too strong a force on the paper 4, while if its Asker C hardness is too low, it may be difficult to remove the punched waste 41 adhering to the cutting edge 3. Therefore, it is preferable for the Asker C hardness to be 17 to 23. For example, a columnar (string-like) foamed material made of chloroprene rubber sponge with an Asker C hardness of 20 can be used as the pressing member 10. Asker C hardness is the hardness measured using a spring-type hardness tester (Asker C-type hardness tester) in accordance with SRIS 0101 (Japan Rubber Association Standard), JIS K 7312, and JIS S 6050.

[0021] The perforating punch 1 of this embodiment has a cutting edge 3 formed along an inclined surface that is inclined in one direction relative to the axis L of the punch body 2, but the shape of the cutting edge 3 is not particularly limited and may be, for example, an inverted V-shape or an inverted U-shape when viewed from the side. [Explanation of symbols]

[0022] 1 Perforation punch 2 Punch body 3 cutting edge 4 Mounting holes 5. Storage section 5a Fixed part 5b aperture 10 Pressing member 20 Support member 30 Foundations 31 Through hole 40 sheets of paper 100 Paper punching device

Claims

1. a cylindrical punch body having a housing portion at the center of a tip portion where a cutting edge is formed; a flexible pressing member held in the housing portion so that a tip thereof protrudes from an opening of the housing portion, a tip end surface of the punch body is an inclined surface inclined in one direction with respect to an axis of the punch body, The pressing member is accommodated with a gap between the outer peripheral surface of the pressing member and the inner wall of the accommodating section so that the tip of the pressing member can be embedded in the accommodating section by bending deformation.

2. The pressing member is formed in a columnar shape, 2. The hole-piercing punch according to claim 1, wherein a fixing portion is formed at the bottom of the accommodating portion, into which a base end of the pressing member is fitted.

3. 3. The hole-piercing punch according to claim 1, wherein the pressing member is a foamed material having an Asker C hardness of 17 to 23.

4. The hole-piercing punch according to claim 1; a support member that supports the hole-piercing punch so that the hole-piercing punch can be raised and lowered; a base having a through hole formed at a position facing the hole-piercing punch, The paper punching device punches holes in the paper by placing the paper on the base and inserting the tip of the punch into the through-hole.

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