JP4035863B2 - Perforated blade - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a blade for performing a perforation process for forming perforations, that is, intermittent cuts, in a sheet-like body such as paper, woven fabric, non-woven fabric, or synthetic resin film.
[0002]
[Prior art]
Perforating a sheet-like body is often performed both inline and offline. As a means for this, particularly in-line, in order to perforate in the flow direction, a method of rotating a round blade having a number of piercing blades on the circumference is taken, and perforations are made in a different direction, for example, the width direction. The method of moving up and down a straight blade in which a number of stab blades are arranged on a straight line has been used. Even when off-line, it is a normal processing method to use any of the above blades.
[0003]
The above-mentioned conventional perforated blades have round and straight blades, the tip of the unit blade to be pierced has a narrow acute angle and a shape that spreads toward the base. The perforation is different. That is, the width of the opening provided in the sheet is not constant. For this reason, if an attempt is made to form a perforation having a certain strength, the perforation processing requires careful attention.
[0004]
Conversely, it should be possible to change the strength of the perforation by adjusting the piercing depth. However, this is a work that requires a high degree of skill for the reasons described above, and it cannot be said that it is realistic. Therefore, it is only possible to prepare a plurality of blades according to the strength of the perforation to be realized and replace them. Absent.
[0005]
[Problems to be solved by the invention]
The first object of the present invention is to solve the above-mentioned problems associated with perforation processing of a sheet-like body, and to form a constant perforation even if the depth of piercing the blade into the sheet varies. The object is to provide a perforated blade capable of achieving the above.
[0006]
A second object of the present invention is to provide a perforated cutting blade that enables the formation of perforations having different strengths with a single blade.
[0007]
[Means for Solving the Problems]
The perforated cutting blade that achieves the above first object of the present invention is a unit blade having two parallel side edges and an acute tip as shown in FIG. 1 or FIG. 2 and FIG. A perforated blade for performing perforation processing on a sheet-like body, which is arranged in parallel, on a straight line or radially on the circumference, and the bases of these unit blades are integrated together at the base. is there.
[0008]
The perforation blade that achieves the second object of the present invention, as shown in FIGS. 4 to 6, is a perforation blade in which two thin half blades are closely overlapped back to back, The sewing machine according to claim 1, wherein the half blades are configured so as to be able to be shifted and fixed at a small distance on the straight line or at a small angle on the circumference, and the width of the unit blade is variable. It is an eye processing blade.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the straight blade, the unit blade may be a single blade as shown in FIG. 2 in addition to the blades as shown in FIG. In any case, it is preferable that the blade edge has an acute angle, that is, 90 ° or less.
[0010]
Of course, the width of the unit blade and the width of the groove between the unit blades can be arbitrarily set. If desired, every other narrow and wide ones are arranged to show a one-dot chain line perforation. Variations such as forming are possible. These also apply to the round blade shown in FIG.
[0011]
As can be understood from the shape of the unit blade described above, the perforated blade according to the present invention does not change the width of the opening formed even if the depth of piercing the sheet-like body is slightly different. Eyes are obtained.
[0012]
This is completely true in principle for straight blades and substantially the same for round blades. This is because, as can be easily understood, the unit blade of the rotating round blade is slightly inclined with respect to the sheet as it rotates from the time it is stabbed into the sheet-like body until it comes out. As a result, it acts in the direction of expanding the opening. However, the force can be absorbed by the elasticity of the sheet-like body, and if it is a round blade having a large diameter and a large number of unit blades, it is not actually necessary to have a problem.
[0013]
As shown in FIGS. 4 and 5, two thin half blades closely stacked back to back to form a single blade are rearward in FIG. 4 and lower half blades in FIG. By sliding and slightly shifting the overlap, the width of the unit blade can be increased.
[0014]
In principle, it is a matter of course that the slidable width is in a range less than the width of the groove between the half blades of each unit blade. It will be readily understood that the range of perforations that can be changed is determined by the ratio of the width of the unit blade of the half blade to the groove. As an example, two perforated blades with a unit blade width and groove width ratio of 40:60 are overlapped, and the perforation is variable within the range of 40% or more and less than 80%. Can be formed. This principle is the same for the rotary blade.
[0015]
【The invention's effect】
The perforated blade of the present invention can ensure the opening of the width of the unit blade as long as the blade at the end of the unit blade completely cuts the sheet-like object even if the depth of piercing into the sheet-like body varies. Therefore, it is not necessary to finely adjust the piercing depth in perforation processing, and perforations can be easily formed within a certain range regardless of the thickness of the sheet. The fact that the thickness of the sheet may vary over a wide range means that the perforating blade of the present invention is useful even when a sheet is cut and stacked in large numbers to form a perforation all at once. means.
[0016]
In the mode where two thin half blades are closely stacked back to back, the perforation strength is variable within a range of one set of blades, so that the perforation processing blade is used to change the strength as in the conventional case. This eliminates the need to prepare and replace
[Brief description of the drawings]
FIG. 1 is an enlarged side view of an example of a perforated blade according to the present invention, with a part omitted.
FIG. 2 is a side view similar to FIG. 1, showing a modification of the perforated cutting blade of FIG.
FIG. 3 is an enlarged side view of another example of the perforated cutting blade of the present invention with a part omitted.
FIG. 4 is a side view similar to FIG. 1 showing the operation together with the shape of still another example of the perforated blade according to the present invention.
5 is a cross-sectional view taken along the line AA in FIG.
6 is a side view similar to FIG. 3, showing the operation together with the shape of still another example of the perforated blade of the present invention. FIG.
[Explanation of symbols]
1 unit blade 11 tip 12 side edge 2 base 3A, 3B single blade

Claims (1)

A large number of unit blades having two parallel side edges and an acute tip are arranged in parallel on a straight line or radially on the circumference, and the bases of these unit blades are integrated together on the base. Two thin half blades formed in close contact with each other in close contact with each other, and the half blades can be fixed with a small distance on the straight line or a small angle on the circumference. A perforating blade for perforating a sheet-like body, wherein the width of the unit blade is variable .

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