JPWO2013018428A1 - Punch and drilling blade - Google Patents

Abstract

Provided are a punch and a drilling blade capable of making a binding hole with a light force.
In a punch configured by disposing a support rod on the lower side of the handle and attaching a plurality of drilling blades thereto, the drilling blades 30 are formed on both side portions of the longitudinal section along the through-hole 31 of the support rod and the blade edge convex portions 32 are provided. And the cutting edge recess 33 is positioned on both sides of the second longitudinal section D perpendicular to the cutting edge. The cutting edge recess is curved in a concave shape toward the center. When cutting off by the cutting edge recess, force is applied in a direction perpendicular to the direction of cutting at the cutting edge protrusion, so correct the curvature of the drilled piece that occurs when cutting at the cutting edge protrusion Can do.

Description

  The present invention relates to a punch for making a hole in a sheet material, and more particularly to a punch capable of performing a punching operation with a light force and a punching blade used therefor.

  When a plurality of binding holes are formed in a sheet material such as paper, the blade tip is directed downward on the lower side of the handle that can be rotated with respect to the punch base as in the punch shown in Patent Document 1. A plurality of drilling blades are used.

  Further, as in the punch shown in Patent Document 2, the perforating blades are arranged on the slide rail so as to be movable up and down, and the perforating blades are sequentially pushed down by a slider that moves on the rail, whereby a large number of binding holes are formed in the sheet. Some have been proposed. In this punch, the perforating blades are sequentially pushed down with a force sufficient to move the slider by corrugating the slide rail.

Utility Model Registration No. 1673227 Japanese Patent No. 3170737

However, the punch of Patent Document 1 requires a lot of punching work because resistance when punching paper increases as the number of punching blades increases.
On the other hand, the punch of Patent Document 2 does not push down a large number of punching blades at the same time, so it can punch the binding holes with a weak force, but it is necessary to arrange a slide rail. The mechanism becomes complicated.
Therefore, an object of the present invention is to provide a punch having a simple structure and capable of making a binding hole with a weak force, and a punching blade used therefor.

In order to solve the above-described problems, the punch according to the present invention is assembled to a base having a slit in a direction orthogonal to the guide path through which the rod-shaped drilling blade is guided, with the cutting edge facing downward. A punch for punching a sheet inserted into the slit by pushing down the punching blade, wherein the punching blade is provided with blade edge convex portions on both sides of a first longitudinal section, A blade edge concave portion is provided on both sides of the second vertical cross section perpendicular to the vertical cross section, and the blade edge concave portion is curved in a concave shape toward the center of the second vertical cross section. is there.
The perforating blade according to the present invention is a rod-shaped perforating blade that is assembled with a cutting edge facing downward on a punch base having a slit in a direction orthogonal to the guide path, on both sides of the first longitudinal section. The blade edge convex portion is provided at the portion, the blade edge concave portion is provided at both side portions of the second vertical cross section orthogonal to the first vertical cross section, and the concave curvature curves from the blade edge concave portion toward the center of the second vertical cross section. It is characterized by having made it.

  According to the punch and the drilling blade of the present invention, the cutting edge is curved in a concave shape from the peripheral edge of the cutting edge concave portion of the drilling blade toward the axial center portion. A force can be applied in a direction orthogonal to the direction applied at the time. As a result, it is possible to correct the curvature of the perforated piece that has occurred during the cutting at the cutting edge convex portion, and to prevent the cutting edge from being caught.

It is a perspective view of a punch concerning a 1st embodiment of the present invention. It is a perspective view which shows the use condition of the said punch. It is a perspective view which shows the state which decomposed | disassembled the said punch. It is a perspective view which shows the drilling blade used for the said punch. The structure of the blade edge of the drilling blade is shown, (a) is a sectional view in the first longitudinal section, (b) is a sectional view of the main part in the second longitudinal section, and (c) is a sectional view taken along line AA. It is. FIG. 2 shows a state in which a punching blade is disposed on a support rod, (a) is a sectional view in a first longitudinal section, and (b) is a partial sectional view showing a state in which paper is punched. It is sectional drawing which shows the state in which the said perforation blade pierces paper, (a) is the 1st vertical section which shows the state cut by the blade edge | tip convex part, (b) is the 2nd which shows the state cut off by the blade edge | tip recessed part. A longitudinal section is shown. It is a 1st deformation | transformation aspect of the said perforation blade, (a) shows the state in a 1st vertical cross section, (b) shows the state in a 2nd vertical cross section. The 2nd deformation | transformation aspect of the said perforation blade is shown, (a) shows the state in a 1st vertical cross section, (b) shows the state in a 2nd vertical cross section. The 3rd deformation | transformation aspect of the said perforation blade is shown, (a) is a perspective view, (b) is the front view seen from the blade edge | side, (c) is principal part sectional drawing which cut | disconnected the blade edge part in the 1st vertical cross section. (D) is principal part sectional drawing which cut | disconnected the blade edge | part in the 2nd vertical cross section. The 4th deformation | transformation aspect of the said drilling blade is shown, (a) is a perspective view, (b) is the front view seen from the blade edge | side, (c) is principal part sectional drawing which cut | disconnected the blade edge part in the 1st vertical cross section. , (D) is a side view seen from the side of the cutting edge convex part.

  A preferred embodiment of the present invention will be described with reference to the accompanying drawings. In addition, embodiment is not limited to the following forms, Other aspects can also be implemented if the subject of this invention can be solved.

FIG. 1 is a perspective view showing a punch 1 according to the first embodiment of the present invention.
The punch 1 is used, for example, to provide a binding hole 4 for a ring binder in a sheet material such as paper 3 when used with a paper fixture 2 as shown in FIG.
In this punch 1, a handle 20 is rotatably provided on the base 10 so that the paper 3 inserted into the slit 11 of the base 10 is punched out by a large number of punching blades 30 provided on the lower side of the handle 20. (See FIG. 3).

The base 10 is configured by erecting a base body 13 on a placement surface 12 on which the paper 3 is placed. The base body 13 is provided with guide paths 14 through which the respective punching blades 30 are guided, and the slits 11 are formed so as to be orthogonal to the guide paths 14. The edge where the guide path 14 and the slit 11 intersect (that is, the opening edge 14 ′ of the mounting surface 12) becomes the lower blade, and the paper 3 is punched by cooperation with the lowering punching blade 30. It has become.
At the front end of the base 10 (that is, the side on which the paper 3 is inserted), a pivot portion 15 for rotatably mounting the handle 20 is provided. A support shaft 21 is attached.

The handle 20 is urged upward by a torsion coil spring 22, and a support rod 23 for supporting the drilling blade 30 is attached to the lower side of the operation portion. Further, a locking projection 24 is provided in front of the paper fixing device 2 so as to be engaged with the paper fixing device 2 for alignment.
The support rod 23 is disposed in parallel with the rotation support shaft 21 of the handle 20, and the rod-shaped drilling blade 30 is sequentially inserted in the through hole 31 provided in the upper end portion.

That is, a large number of drilling blades 30 are attached to the support rod 23 side by side, and the support rod 23 is disposed below the handle 20, so that all the drilling blades 30 can be moved simultaneously by pushing down the handle 20. It can be lowered.
The perforating blade 30 is configured by providing a cutting edge at the lower end of the rod-like body, and the paper 3 can be punched by continuing to descend while cutting the paper 3 with the cutting edge. Hereinafter, the structure of the cutting edge will be described with reference to FIGS. 4 and 5.

The drilling blade 30 is provided with cutting edge protrusions 32 and 32 on both sides of a first longitudinal section extending along the through hole 31, and cutting edge recesses 33 and 33 on both sides of a second longitudinal section D perpendicular to the longitudinal section. Provided.
The edge part of the periphery of this blade edge | tip recessed part 33 becomes the ridgeline curved in the U shape (refer FIG.4 and FIG.5 (a)). And as shown in FIG.5 (b), the area | region L toward the center 34 from the both sides (namely, blade edge | tip recessed part 33, 33) of the 2nd vertical cross section D is a concave curved surface with respect to an edge part. It has become.
A number of drilling blades 30 configured in this way are arranged on the support rod 23 through the through holes 31. In this way, a punch for multiple holes is configured. In this embodiment, the large number of drilling blades 30 are configured by two types of drilling blades 30a and 30b having different lengths M from the through hole 31 to the blade tip. (See FIG. 6).

That is, the support rod 23 has two types of perforation blades 30; a first perforation blade 30a having a short length M1 from the through hole 31 to the blade edge, and a second perforation blade 30b having a slightly longer length M2. Are alternately arranged. In this case, the difference in length (M2−M1) is appropriately designed according to the blade diameter of the punching blade 30, the depth of the blade bottom, and the stroke of the handle 20.
In this way, by attaching a plurality of types of drilling blades 30 having different lengths up to the blade tip to the lower side of the handle 20 via the support rod 23, each type of the drilling blade 30 is lowered when the upper surface portion 23 of the handle 20 is pushed down. It is possible to vary the timing at which the perforating blade 30 cuts the paper 3.

A method of providing a binding hole in the side edge portion of the paper 3 using the punch 1 having the above configuration will be described.
First, as shown in FIG. 2, the paper 3 is fixed by the paper fixing device 2.
Then, a locking projection 24 provided in front of the handle 20 is engaged with the locking recess 5 of the paper fixing device 2 to set a drilling position. Thereafter, when the handle 20 is pushed down, the support rod 23 descends, and a number of drilling blades 30 attached to the support rod 23 descend simultaneously.
At this time, the drilling blade 30 attached to the support rod 23 is constituted by a plurality of types of drilling blades 30a and 30b having different lengths M1 and M2 from the through hole 31 to the blade tip. 30a and 30b punch the paper 3 at different timings. This can reduce the load during the drilling operation (see FIG. 6).

In addition, each of the perforating blades 30 is provided with cutting edge protrusions 32 and 32 on a first vertical cross section along the through hole 31, and cutting edge recesses 33 and 33 are provided on a second vertical cross section D orthogonal thereto. Therefore, when the handle 20 is pushed down, it can be cut from the edge portion toward the axial center portion 34 side (see FIG. 7).
That is, in the drilling blade 30 having the structure in which the blade edge convex portions 32 are provided on both side portions of the first vertical cross section and the blade edge concave portions 33 are provided on both side portions of the second vertical cross section D perpendicular thereto, the blade edges on both sides are provided. The portion 3 ′ cut by the convex portion 32 may be pushed toward the center to bend into a V shape, and may be cut off in a curved state. In this state, when the perforating blade 30 is pulled out from the paper 3, the perforated piece 3 ′ may be caught by a burr or the like at the blade edge (see FIG. 7A), causing clogging.

In this respect, since the punch according to the present embodiment is concavely curved from the peripheral edge of the blade edge recess 33 toward the axial center portion 34, when being cut off by the blade edge recess 33, at the time of cutting at the blade edge protrusion 32. The force F2 by the blade edge recess 33 can be applied in a direction orthogonal to the force F1 applied to (see FIG. 7B).
As a result, it is possible to correct the curvature that has occurred during the cutting at the blade edge convex portion 32, and to prevent the blade edge from being caught.

Further, since the inclined surface L is formed from the peripheral surface of the cutting edge recess 33 toward the axial center portion, when the perforated piece 3 ′ is cut off by pushing down the handle 20 to the lowermost end, the inclined surface L is inclined with respect to the paper 3. You can enter at an angle. As a result, the cutting performance in the cutting edge recess 33 is enhanced, and the perforation line becomes sharp.
And since the edge part of the peripheral edge of the blade edge | tip recessed part 33 becomes the curved U-shaped ridgeline, when the site | part cut by the blade edge | tip convex parts 32 and 32 of both sides is pushed toward the axial center part 34, In addition, it can be prevented from being bent into a V shape. Thereby, when the perforating blade 30 is pulled out, the bent perforated piece 3 ′ can be prevented from being caught by the blade edge.

When perforating a large number of sheets of paper 3 at a time, the perforated piece 3 ′ is not easily bent, but a large force is required for the perforating operation. If the angle from the blade bottom to the blade edges on both sides (that is, the blade edge angle B) is reduced and the depth H from the blade edge to the blade bottom is increased, drilling can be performed with a relatively light force. It bends in a letter shape and is easily caught on the blade edge.
Therefore, in order to obtain the optimum curved state in the blade edge recess 33, the following load test was performed using the drilling blade 130 shown in FIG. In addition, in order to obtain the curved state of the cutting edge recess 33 in relation to the diameter R of the drilling blade and the blade bottom depth H, the drilling blade that does not curve from the peripheral edge portion toward the axial center portion 34 (that is, linear) 130 was used.

Use a drilling blade 130 having a cross-sectional diameter R of 6 mm and a cutting edge angle B of 80 ° so that the curvature radius r of the blade bottom is 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, and 2.5 mm. In addition, a perforation blade having a changed curvature is prepared, a paper bundle (a bundle of 25 copy sheets) is perforated with each perforation blade, and the perforation load when the handle 20 is pushed down, The pulling-out load at the time of returning was measured with a load testing machine (Nidec Symposium FGS-50VB-H). The results are shown in Table 1.

As a result of the test, when the curvature radius r of the blade bottom was curved so as to be 1.5 mm, the load at the time of drawing was remarkably increased. This means that perforated scraps were caught on the cutting edge, and it was confirmed that when the radius of curvature r is 1.5 mm or less, the perforated piece 3 'is easily caught on the cutting edge. .
Similar results were obtained with other test machines, and it was confirmed that when the radius of curvature r of the blade bottom was greatly curved to 2.0 mm, the pull-out load decreased and it was difficult to cause catching.
When the curvature radius r of the blade bottom is 2.5 mm or more, a lot of the paper 3 is cut off at a time, so that the punching load becomes high.
On the other hand, when the radius of curvature r of the blade bottom is 0.5 mm or less, it is cut off little by little, so that the perforation load is low, but the perforation piece 3 ′ is likely to be bent.

Therefore, in a drilling blade having a cross-sectional diameter R of 6 mm, the radius of curvature r is 1.5 mm to 2.5 mm (preferably from 1.5 mm) at the deepest blade bottom in the second vertical cross section D having the blade edge recesses 33 on both sides. It has been confirmed that it is desirable to bend so as to be larger than 2.0 mm from the viewpoint of reducing the perforation load while preventing the perforation piece 3 ′ from being caught on the blade edge.
That is, the deepest portion in the second longitudinal section D extending in a direction orthogonal to the through hole 31 (the rotation support shaft 21 of the handle 20) has a curvature radius r of 3/10 to 4/10 with respect to the section diameter R. It is preferable to design the curved state of the blade edge recess 33 so as to be (preferably about 1/3).

Further, in order to investigate the optimum cutting edge angle B in the curved state, the cutting edge angle B was changed to 60 °, 70 °, 80 °, 90 °, 100 °, 110 °, 120 °, and the same test was performed. . The results are shown in Table 2.

From this test result, it was confirmed that when the blade edge angle B exceeds 90 °, the depth H of the blade bottom becomes small, so that the drilling load becomes high. On the other hand, when the angle is less than 70 °, the cutting edge becomes sharp, so that the perforation load is low, but there are problems in the durability and manufacturing of the blade.
Therefore, it was confirmed that the cutting edge angle B is preferably designed to be 70 ° to 90 ° (desirably about 80 °).

  In addition, as a piercing blade, like the piercing blade 230 shown in FIG. 9, the second longitudinal section D is positioned slightly shifted from the center of the first longitudinal section toward one side portion, thereby forming a convex edge. You may use what changed the length from the part 32 to a through-hole by right and left. In this way, by changing the positions of the lower end portions of the cutting edge convex portions 32 and 32 ′, it is possible to shift the timing of cutting the paper and reduce the punching load.

  Further, as in the case of the drilling blade 330 shown in FIG. 10, the load at the time of drilling may be reduced by making the axial center part 34 largely depressed to be like a pipe rod, or the drilling shown in FIG. Like the blade 430, the load may be reduced by providing a hole 35 in the vicinity of the blade edge convex portion 32 to reduce friction during drilling.

In the punch according to the present invention, the punching blade 30 is not limited to two types, and may be a multi-hole punch having a structure in which the punching blades 30 having various shapes are attached to the support rod 23 in an arbitrary order.
Further, the punch in which the punching blade according to the present invention is used may be a two-hole punch composed of two holes or a one-hole punch.

  The present invention can be applied not only to office use but also to punches and drilling blades used in all industrial fields.

DESCRIPTION OF SYMBOLS 1 ... Punch 2 ... Paper fixing tool 3 ... Paper (sheet)
DESCRIPTION OF SYMBOLS 4 ... Binding hole 5 ... Locking recessed part 10 ... Base 11 ... Slit 12 ... Mounting surface 13 ... Base main body 14 ... Guide way 15 ... Pivot part DESCRIPTION OF SYMBOLS 20 ... Handle 21 ... Turning support shaft 22 ... Torsion coil spring 23 ... Support rod 24 ... Locking protrusion 30, 130, 230, 330, 430 ... Drilling blade 31 ... Through-hole 32 ... Cutting edge convex part 33 ... Cutting edge concave part 34 ... Axial center part 35 ... Hole

Claims (11)

The drilling blade (30) is assembled with the cutting edge facing downward on a base (10) provided with a slit (11) in a direction orthogonal to the guide path (14) through which the rod-shaped drilling blade (30) is guided. A punch (1) configured to perforate a sheet inserted into the slit (11) by pushing down the perforating blade (30),
The perforating blade (30) is provided with cutting edge projections (32, 32) on both side portions of the first vertical cross section, and the cutting edge is formed on both side portions of the second vertical cross section (D) perpendicular to the first vertical cross section. A punch provided with a recess (33, 33) and curved in a concave shape from the blade edge recess (33, 33) toward the center (34) of the second longitudinal section (D) . A support rod (23) disposed in parallel with the pivot shaft (21) of the handle (20) below the handle (20) pivotally supported with respect to the base (10). The perforated blade (30) attached in large numbers
It consists of several types of perforation blades (30a, 30b) from which the length (M1, M2) from the through-hole (31) for inserting the said support rod (23) to a blade edge | tip differs. The punch described.   The perforating blade (30) has edge portions at the periphery of the blade edge recesses (33, 33) provided on both sides of the second longitudinal section (D) extending in a direction orthogonal to the through hole (31). The punch according to claim 2, wherein the punch is a curved ridgeline.   The deepest blade bottom in the second longitudinal section (D) is curved so that the radius of curvature (r) is 3/10 to 4/10 with respect to the diameter (R) of the section. The punch according to any one of claims 1 to 3.   The second longitudinal section (D) is shifted from the center of the first longitudinal section, so that the lower end position of the cutting edge convex part (32, 32 ') is different on the left and right. The punch according to any one of claims 1 to 4.   The punch according to any one of claims 1 to 5, wherein a hole (35) is provided in the vicinity of the cutting edge convex portion (32). A rod-shaped perforating blade (30) assembled with a cutting edge facing downward on a punch base (10) provided with a slit (11) in a direction orthogonal to the guide path (14),
Cutting edge protrusions (32, 32) are provided on both sides of the first vertical section, and cutting edge recesses (33, 33) are provided on both sides of the second vertical section (D) perpendicular to the first vertical section. In addition, a drilling blade characterized by being curved in a concave shape from the blade edge recess (33, 33) toward the center (34) of the second longitudinal section (D).   A support rod (23) disposed below the handle (20) pivotally supported with respect to the punch base (10) and in parallel with the rotation shaft (21) of the handle (20). Of the blade edge recesses (33, 33) provided on both sides of the second longitudinal section (D) extending in a direction perpendicular to the through hole (31). The perforated blade according to claim 7, wherein the peripheral edge portion is a curved ridgeline.   The deepest blade bottom in the second longitudinal section (D) is curved so that the radius of curvature (r) is 3/10 to 4/10 with respect to the diameter (R) of the section. The perforation blade according to claim 7 or claim 8.   The second longitudinal section (D) is shifted from the center of the first longitudinal section, so that the lower end position of the cutting edge convex part (32, 32 ') is different on the left and right. The drilling blade according to any one of claims 7 to 9, wherein:   The perforation blade according to any one of claims 7 to 10, wherein a hole (35) is provided in the vicinity of the blade edge convex portion (32).

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