JP2000280374A - Cutter for forming lead rule - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a lead rule evident distinguishing a punching line from the rule. SOLUTION: Punching edge portions 6 each having an end formed as a cutting edge 4 and scoring portions 7 each having a lower height than that of the portion 6 are alternately provided at one side edge of a blade plate 2. Cutouts 8 along the edges of the portion 6 are formed at both ends of edges of the portion 7 so that the portions 7 and the portions 6 are independent. Then, the overall portions 7 are effectively intruded into a sheet to form a lead rule in which a punching line is clearly distinguished from the rule.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade for forming a lead rule.

[0002]

FIG. 3 shows a lead rule formed on a sheet S. As shown in FIG. In the lead crease 10, a plurality of punching lines 12 are formed on a crease line 11 for bending at intervals.

Since the lead rule 10 has a plurality of punched lines 12, the lead rule 10 can be easily bent along the ruled line 11, and is extremely effective for forming a portion where it is difficult to bend.

[0004] As a cutting blade for forming the above-described lead rule 10, the one shown in FIG. 4 is conventionally known. The blade 20 for forming a lead rule is a blade plate 2 made of a strip-shaped steel plate.
1. A chamfer 22 inclined in the opposite direction is formed on both surfaces of one side edge portion, and a plurality of notches 24 are formed at equal intervals in a cutting blade 23 formed at an intersection of the chamfers 22, and the notches are formed. 24 is a punching portion 25, and each notch 2
The portion facing 4 is a ruled portion 26.

[0005]

By the way, in the conventional blade for forming a lead rule shown in FIG.
Since the rounding 27 is formed at the intersection of the both end edges of the cutting edge portion and the leading edge of the pressing portion 26, and the pressing portion 26 is continuous with the punching blade portion 25, the cutting tool is pressed against a sheet S such as a corrugated cardboard sheet or cardboard. When the lead crease is processed, the material of the creased portion pressed by the pressing crease portion 25 does not easily escape, and after the crease of the lead crease, the shape of the creased portion is restored and the sharpness is deteriorated.
There is a disadvantage that it is not possible to obtain a good lead rule in which 1 and the punched line 12 are clearly distinguished.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lead rule forming blade capable of forming a good lead rule capable of clearly distinguishing a ruled line from a punched line.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a punching blade portion having a cutting edge at one side edge of a blade plate made of a strip-shaped steel plate, and a punching blade portion thereof are provided. In a cutting tool for forming a lead rule, in which a ruled portion having a height lower than the blade portion is provided alternately, a configuration is employed in which cuts are formed at both ends of the leading edge of the ruled portion along the edge of the punching blade portion. ing.

Here, the cut may be slightly inclined toward the ruled portion. Further, both ends of the leading edge of the ruled portion may be rounded.

According to the above construction, when the lead crease forming blade is pressed against the sheet to process the lead crease, the material of the creased portion pressed by the crease portion escapes to the cut, so that the entire crease portion is cut. Can be cut into the sheet,
Clear rules can be added to the sheet. In addition, since the punching blade portion is also independent, it is possible to reliably pierce the sheet and to form a good lead rule in which the ruled line and the punched line are clearly distinguished.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG.
A blade 1 for forming a lead crease includes a chamfer 3 inclined in opposite directions on both sides of one side edge of a blade plate 2 made of a strip-shaped steel plate.
Are formed at equal intervals on the cutting blade 4 formed at the intersection of the chamfers 3, and the protruding portion between the adjacent notches 5 is used as a punching blade 6, which faces the notch 5. The portion is a ruled portion 7.

At both ends of the leading edge of the ruled portion 7, cuts 8 having a minute width are formed along both edges of the punching blade portion 6. Here, the ruled portion 7 has a straight edge at the front end, but may have a bulge at the center of the front end or a hollow at the center of the front end.

As described above, when the cuts 8 are formed along the both edges of the punching blade 6, the lead rule forming blade 1 is pressed against the sheet S to form the lead rule, as shown in FIG. At the time of processing, the material of the creased portion pressed by the crease portion 7 escapes to the cut 8, and the entire leading edge of the crease portion 7 can be cut into the sheet S.

For this reason, a clear ruled line can be formed, and the punching blade portion 6 can also reliably penetrate the sheet S, so that the ruled line 11 and the punched line 12 are clearly distinguished. A simple lead rule can be formed.

[0014]

As described above, according to the present invention, since the cuts are formed along both edges of the punching blade portion, the punching blade portion and the creasing portion become independent by the above-mentioned cut, and the lead ruler for the sheet is formed. At the time of processing, the material of the creased portion due to the pressing of the creased portion escapes to the cut, and the entire front edge of the creased portion can be cut into the sheet.

[0015] For this reason, a clear ruled line can be formed by the pressing ruled portion, and a good sheet rule can be obtained in which the punched line formed by the punching blade and the ruled line are clearly distinguished.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cutting tool according to the present invention.

FIG. 2 (I) is a cross-sectional view of the state in which the blade shown in FIG. 1 is pressed against a sheet, (II) is a cross-sectional view along the line aa of (I), and (III) is b of (I). Sectional view along line -b

FIG. 3 is a perspective view showing a lead rule.

FIG. 4 is a front view of a conventional blade for forming a lead crease.

[Explanation of Signs] 2 blade plate 4 cutting blade 6 punching blade section 7 creasing section 8 cutting

Claims (1)

[Claims] 1. A lead crease having, on one side edge of a blade plate made of a strip-shaped steel plate, a punching blade having a cutting edge at its tip and a creasing portion having a height lower than the punching blade. The cutting blade for forming a lead rule, wherein cuts are formed at both ends of the leading edge of the pressing ruled portion along the edge of the punching blade portion.