JP3169833B2 - Perforated punch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforation punch for office work for perforating binding holes in sheets or the like laminated to a predetermined thickness.

[0002]

2. Description of the Related Art Conventionally, a perforated punch has a punch blade lined up in a row in accordance with the position of a hole to be drilled, a punch blade retainer is lowered using a link mechanism, and the punch blade retainer is pressed downward by pressing the punch blade. The stacked perforated sheets are perforated. In addition, a plurality of punch blades having different lengths are attached, and when the punch blades are pressed by the punch blade holder and descend, the punched paper is punched in order from the long punch blade to reduce the force required for punching. There is. Further, there is known a perforated punch having a mechanism in which punch blades having the same length are arranged in a line, and a punch blade holder having a stepped step having a concave shape with a downward concave center is provided at an upper portion of the punch blade to reduce the force required for punching. (Japanese Utility Model Laid-Open No. 58-132699).

[0003]

However, in the conventional perforated punch described above, the punch blade holder is lowered by using a link mechanism. When it is thick, a large force is required for drilling. For this reason, the force required for drilling is reduced by maximizing the use of the link mechanism, but on the other hand, a large force is applied to the parts constituting the link mechanism, so that the parts are often worn or damaged. Further, in order to solve these, there is the above-mentioned perforated punch in which the length of the punch blade is changed, but since a plurality of punch blades having different lengths are required,
There is a problem that the production of the punch blade and the assembly of the perforated punch become complicated.

Further, in the above-described apparatus using the punch blade retainers formed in a plurality of stages, since the center portion of the punch blade retainer has a concave inverted V-shape, both ends of the punch blade retainer are supported by a link mechanism. If the load is lowered, there is a possibility that the stress will be concentrated at the center and the breakage will occur. To avoid this, there is a problem that the punch blade holder itself becomes heavy. Further, there is a problem that the paper is shifted or wrinkled because the paper is punched from both ends to the center.

It is an object of the present invention to reduce the number of components by using punch blades of the same length, to realize the ease of manufacturing and assembling, and to reduce the force required for perforating the perforated paper. It is to provide a perforated punch that reduces well.

[0006]

According to the present invention, a large number of punch blades are arranged in a straight line, and the punch blades are pressed by a presser.
In a perforated punch for perforating paper disposed below the punch blade, each punch blade (1) having the same length has a reduced diameter portion at the upper portion of a columnar shape, and a stopper (2) is provided at the reduced diameter portion. By being inserted, it is held so as to be able to move up and down through a hole formed in a punch blade holder (4) fixed to the punch blade holder (3). A punch blade holder (3) having a downwardly convex shape and having a step-like step toward both ends is installed so as to be able to ascend and descend, and the punch blades (1) are sequentially stepped from the center in accordance with the drop of the punch blade holder. The present invention relates to a perforated punch having a lowering mechanism.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a porous punch according to the present invention. 1 to 7 are views showing one embodiment of a porous punch of the present invention, FIG. 1 is a partial cross-sectional view from the front, FIG. 2 is a side view, FIG. 3 is a partial cross-sectional view from the side, FIG. 4 is an enlarged view of the punch blade (1), FIG. 5 is a partially enlarged view showing an example of a step of the punch blade holder (3), and FIG. 6 is a part showing another example of a step of the punch blade holder (3). FIG. 7 is an enlarged view and FIG. 7 is a partial sectional view showing a punch hole number adjusting mechanism.

In FIG. 1, a die (1) is mounted on a base (5).
1) and the punch blade guide (12) are fixed,
Further, two brackets (6) are fixed so as to stand upright on both side surfaces of the punch blade guide (12). The punch blade holder (3) has roller shafts (7) attached to both ends thereof, and the roller shafts (7) are fitted into rectangular holes (19) as shown in FIG. Accordingly, the punch blade holder (3) is mounted so as to be able to move up and down. The punch blade retainer (3) has a convex shape at the center and has a step-like step toward both ends, and the rear portion of the punch blade retainer (3) has an L-shaped cross section as shown in FIG. The punch blade holder (4) is attached. The punch blade holder (4) is provided with a hole for determining a perforation hole of the perforated paper, and the punch blade (1) is arranged so as to be able to move up and down by the stopper (2) so as to penetrate this hole.

As shown in FIGS. 1 and 2, one end of each arm (8) is connected to a handle (9), and the other end is rotatably connected to a bracket (6) by a fulcrum pin (10). I have. Further, the arm (8) is rotatably connected to the roller shaft (7), and forms a link mechanism in which the punch blade holder (3) moves up and down by the rotational movement of the arm (8).

In FIG. 3, a die (11) is mounted on a base (5) serving as a base, and a punch blade guide (1) is mounted from above.
2) is fixed to the die (11). Between the die (11) and the punch blade guide (12), there is an insertion gap (20) for the perforated paper, and this gap (20) defines the thickness of the perforated paper. Hereinafter, this is referred to as a specified maximum thickness. The die (11) and the punch blade guide (12) have the same through holes as the row of the punch blades (1), and when punching the perforated paper, the punch blade guide (12) moves down the punch blade. Restrict movements other than the vertical movement of (1). When punching a perforated sheet, the edge of the punch blade (1) is a die (1).
After passing through 1), the paper is perforated by the shearing force at this time to form a circular paper chip, and the paper chip is discharged downward through the hole of the die (11). Below the die (11), a paper waste tray (13) is arranged, which is detachably inserted from the side surface of the base (5) in a pull-out manner.

As shown in FIG. 4, a reduced diameter portion (18) is provided above the punch blade (1).
8) Insert the stopper (2) into the punch blade holder (4)
As shown in FIG. 3, the punch blade (1) is held in a vertically movable state through the hole of the punch blade holder (4). As the stopper (2), a normal E-ring can be used. As shown in FIG. 4, a notch is provided below the punch blade (1), and a tip forms a blade edge. The cutting edge angle α is appropriately selected,
When the cutting edge angle α is increased, the force required for drilling increases. On the other hand, when the cutting edge angle α is reduced, the force required for drilling decreases, but the tip of the punch blade (1) deforms due to repeated use. May occur. Therefore, in consideration of the conflicting demands of reducing the force required for drilling and deforming the tip of the punch blade (1), the normal cutting edge angle α is preferably 30 to 60 degrees.

When the punch is pulled out of the perforated sheet after punching, the punch blade holder (4) is moved to the punch blade (1).
The stopper (2) fitted in the reduced diameter portion (18) is lifted, and the punch blade (1) rises. Punch blades of the same length (1)
By changing the position of the reduced diameter portion (18), the timing for pulling out the punch blade (1) can be changed, and the resistance at this time can be reduced.

Since the center of the punch blade holder (3) is convex downward and has a step-like step toward both ends, when the punch blade holder (3) descends, the punch blade machined into the same length. Since (1) is pressed in order from the center to both ends and descends in a stepwise manner, the perforated paper disposed in the gap (20) between the die (11) and the punch blade guide (12) is located at the center. Piercing sequentially from both ends. The method of providing the step of the punch blade holder (3) is appropriately selected. However, since the tip of the punch blade (1) has the greatest resistance when the tip of the punch blade (1) pierces the perforated paper, a large number of steps are required. By providing a step so as to shift the timing at which the punch blade (1) pierces the sheet, the force required for punching can be reduced. Therefore, in order to reduce the force required for punching, it is preferable to make the step of the punch blade holder (3) the same as the specified maximum punching thickness. However, in actuality, the punch blade (1) is stacked when punching a sheet. Since the paper is compressed, the thickness of the paper becomes about 20% thinner than the thickness of the laminated paper. Therefore, the thickness of the paper when compressed and thinned may be used. On the other hand, increasing the height of the step impairs the reduction of the force required for drilling and increases the height of the punch blade holder (3).
When the link mechanism is used, the amount of rotation of the arm is increased, and the amount of movement and the piercing force when operating is increased, which is not preferable. In consideration of the above points, in the present invention, the height of the step is preferably 0.3 to 2 times the specified maximum thickness of the perforated paper. Further, the height of the step is set to 0.3 to 1 times the specified maximum thickness, and the step is provided so that only two or less of the plurality of punch blades (1) are perforated in the same phase at the same time. Is most preferred. If this step is less than 0.3 times the specified maximum thickness, the number of steps is too large to complicate the shape. If it exceeds twice, the force required for perforation cannot be reduced efficiently.

An example of setting the step of the punch blade holder (3) will be described. FIG. 5 shows an example in which the punch blade retainer (3) has a symmetrical left and right step with respect to the center. FIG. 5 shows a case where the number of the punch blades (1) is even, and the middle stage has a width for pressing the two punch blades (1). The height A of the step is one time the specified maximum thickness determined by the gap between the die (11) and the punch blade guide (12). First, the center step pushes down two punch blades (1) to perform the first punching, and when the tip of the punch blade (1) penetrates all the sheets, then the two steps immediately outside the center correspond to the corresponding outer sides. Press two punch blades (1) to start punching. Next, the perforation is repeated by successive steps on both outer sides to perforate the perforated paper.

FIG. 6 shows another example of the step of the punch blade holder (3), and the punch blade holder (3) is an example of left-right asymmetry. In FIG. 6, first, the punch blade holder (3)
The center part of pushes one punch blade (1) to perform the first punching, and then one outer side (left side) of the center pushes the corresponding punch blade (1) to start punching. Next, the center is pierced by the step on the opposite side (right side). In this case, the height of the step is half of A (0.5 times the specified maximum thickness) only on the left side closest to the center, and all other steps are A
(1 time of the specified maximum thickness). In this way, punching is started by pressing the punch blades (1) one by one alternately from left to right from the center. This is repeated successively to perforate the perforated paper.

If necessary, the punch punch retainer (3) can be subjected to a simple additional process to the punch punch number adjusting portion (14) in the porous punch of the present invention. In FIG. 7, a through-hole is formed in the punch blade holder (3) from the front, a U-shaped switching plate (16) is disposed from below, and the punch blade holder (3) and the switching plate (16) are positioned from the front. Attach the knob (15) so that it penetrates. Knob (1
5) is fixed by the screw portion of the switching plate (16),
A punch hole number adjusting section (14) is formed. The entire punch hole number adjusting unit (14) moves up and down in conjunction with the punch blade holder (3), but the switching plate (16) can be moved back and forth by a knob (15). A through hole (17) having a diameter larger than that of the punch blade (1) is provided at a front portion of the switching plate (16), and when the knob (15) is pulled forward, the punching hole is formed by the switching plate (16). The punch blade (1) at the position where the number adjusting unit (14) is attached is pressed to punch the perforated paper. On the other hand, when the knob (15) is pressed, the punching plate (1) has a through hole (17) in the switching plate (16) when the punching blade holder (3) is lowered.
Is not pressed, so that the corresponding portion is not drilled.
This makes it possible to cancel the perforation at an arbitrary position of the perforated punch in which certain punch blades are arranged. At the place where the punch hole number adjusting section (14) is attached, the step of the punch blade holder (3) is apparently increased by the thickness of the switching plate (16), so that the punch blade (1) having the same length is used. In the case of using, the perforation at that location proceeds quickly.
In order to solve this, the punch blade (1) at the position where the punch hole number adjusting unit (14) is attached is changed to the switching plate (1).
There is a method of shortening by the thickness of 6). Another method is to reduce the step of the punch blade holder (3) at the place where the punch hole number adjusting section (14) is to be attached by the thickness of the switching plate (16) in advance. Is not a step-like shape but a concave notch, which is not preferable from the viewpoint of strength. As a method of using the number-of-punch-holes adjusting unit (14), for example, there is switching of the number of punch holes for A4 size and B5 size paper. A4 size and B5 size papers have the same hole pitch standard, but differ in the number of holes, 30 holes and 26 holes. When A4 size paper is perforated with a 26-hole perforated punch, the number of holes is insufficient. On the other hand, when a B5 size is pierced with a 30-hole punch,
In addition to the holes, there is another 27th hole in the corner of the paper. In order to solve this problem, by attaching the punch hole number adjusting section (14) to the 27th hole from the left end of the punch blade holder (3), 1
It is possible to pierce sheets of different sizes of A4 and B5 with one multi-hole punch.

FIG. 1 shows a punching operation using the porous punch of the present invention.
This will be described with reference to FIG. A sheet for perforation is placed on the base (5), and the die (1) is flush with the upper surface of the base (5).
1) and a punch blade guide (1) above the die (11).
It is arranged so that the perforated portion of the perforated paper is pressed against the gap (20) formed in 2). When the handle (9) is pushed down, the arm (8) rotates, and the link mechanism increases the working force in the leverage application so that the bracket (6)
The punch blade retainer (3) having a step-like shape, which is connected to the roller shaft (7), descends, and with the descending, the punch blade (1) moves stepwise from the center toward both ends. In order to lower the sheet, the sheet on which the cutting edge of the punch blade (1) is disposed is sequentially punched from the center of the sheet toward both outer sides. On the other hand, the paper waste generated by the perforation is discharged and accumulated in a paper waste receiver (13) provided below the base.

[0018]

【Example】

Example 1 As shown in FIG. 4, the cutting edge angle α is 45 degrees and the diameter is 5.5 mm.
A 30-hole punch as shown in FIG. 1 was manufactured using the punch blade (1). A 1.5 mm gap (20) is provided between the punch blade guide (12) and the die (11), and the punch blade holder (3) has two punch blades (1) at the center as shown in FIG. ) Was pressed, and a step having a step of 1.2 mm in height toward both outer sides was used, and the center was used to project downward. The lever ratio (the distance from the fulcrum to the force point relative to the distance from the fulcrum to the point of application) in the link mechanism is 15 at the maximum and 1 at the minimum.
0. Using this multi-hole punch, general-purpose PPC paper 1
Five perforations were performed, and the perforation force at that time was measured. The measurement was performed using a spring balance attached to the handle, and the hole was drilled by pulling the spring balance in the tangential direction of the rotation direction of the handle. At that time, the maximum value indicated by the spring balance was defined as the maximum punching force. The maximum punching force of this multi-hole punch was 8 kg, and the punch was able to be punched accurately without paper misalignment or wrinkles.

Comparative Example 1 A punch blade (1), a punch blade guide (12), a die (11), and a link mechanism were the same as those of the first embodiment except that a linear punch blade holder having no step was used. A 30-hole perforated punch was produced. Using this perforated punch, 15 sheets of general-purpose PPC paper were perforated, but could not be perforated manually.

Comparative Example 2 A punch blade (1), a punch blade guide (12), a die (11), and a punch holder were the same as in Comparative Example 1, except that the lever ratio in the link mechanism was set to a maximum of 60 and a minimum of 40. 3
A zero-hole punch was produced. As a result of perforating 15 sheets of general-purpose PPC paper using this multi-hole punch, the maximum punching force was 30 kg, but the roller shaft was broken by about 20 repetitions, making it impossible to punch.

COMPARATIVE EXAMPLE 3 Except for preparing three types of punch blades having different lengths and arranging punch blades having the same length in order from every other three blades, the edge shape of the punch blade (1) and the punch blade guide (12) and die (1)
1) A 30-hole perforated punch having the same link mechanism and punch holder as in Comparative Example 1 was manufactured. The maximum punching force of this porous punch was 40 kg.

[0022]

According to the present invention, a punch having a specific shape can be used to reliably punch a hole with a smaller force by using a punch holder having a specific shape. Therefore, the number of components can be reduced, and the manufacturing and assembling steps can be simplified. Further, since it is not necessary to increase the leverage of the link mechanism for the purpose of reducing the piercing force, the problem of wear and breakage of the components can be improved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a porous punch of the present invention as viewed from the front.

FIG. 2 is a side view showing a porous punch of the present invention.

FIG. 3 is a partial cross-sectional view of the porous punch of the present invention as viewed from the side.

FIG. 4 is an enlarged view of a punch blade (1) of the multi-hole punch according to the present invention.

FIG. 5 is a partially enlarged view showing an example of a step of a punch blade holder (3) of the multi-hole punch of the present invention.

FIG. 6 is a partially enlarged view showing another example of the step of the punch blade holder (3) of the multi-hole punch of the present invention.

FIG. 7 is a partial sectional view showing a punch hole number adjusting mechanism of the present invention.

[Explanation of symbols]

 1: punch blade 2: stopper 3: punch blade holder 4: punch blade holder 5: base 6: bracket 7: roller shaft 8: arm 9: handle 10: fulcrum pin 11: die 12: punch blade guide 13: paper Drain receiver 14: Number of punch holes adjusting part 15: Knob 16: Switching plate 17: Through hole 18: Reduced diameter part 19: Rectangular hole 20: Gap α: Edge angle of punch blade (1) A: Punch blade holder (3) Step height

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-60695 (JP, A) JP-A-60-67100 (JP, A) JP-A-60-6399 (JP, A) 132695 (JP, U) Japanese Utility Model Showa 58-191999 (JP, U) Japanese Utility Model Showa 58-150498 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B26F 1/32 B26F 1 /14

Claims (2)

(57) [Claims] 1. A multi-aperture punch in which a number of punch blades are arranged in a straight line, the punch blades are pressed by a presser, and a punch disposed in a hole under the punch blades is punched. (1) has a reduced diameter portion at a cylindrical upper portion, and is inserted into a punch blade holder (4) fixed to a punch blade holder (3) by inserting a stopper (2) into the reduced diameter portion. A punch blade holder (3) having a shape in which a central portion is downwardly convex and has a step-like step toward both ends is provided on an upper portion of the punch blade (1). A perforated punch characterized by having a mechanism which is installed so as to be able to ascend and descend, and in which a punch blade (1) descends step by step from the center in accordance with a drop of the punch blade holder. 2. The multi-aperture punch according to claim 1, wherein the step of the punch blade holder (3) is 0.3 to 2 times a specified maximum thickness of the perforated paper.