JPS63312099A - Knife for punching sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a thin, band-shaped sheet stamping machine used when punching a sheet of paper, plastic sheet, corrugated board, etc. into a predetermined shape by punching press processing. This relates to a pick knife (hereinafter referred to as a knife).

[Prior art and problems to be solved by the invention] Conventionally,
As the above-mentioned knife, for example, those shown in FIGS. 5 and 6 are known.

As shown in the figure, the knife A has a thin wall (e.g., wall thickness: 0.4 to 1, Qm), a band shape, and has a tooth tip 1 having both flanks and a substantially rectangular cross section. The knife A is used by being fitted and fixed into a knife fitting groove 3 that is continuously formed through the wooden knife holding base 2.

The knife insertion groove 3 is previously formed into a predetermined shape (a shape corresponding to a cutting die) by a jig saw or laser processing, and when formed by the laser processing, which has become popular in recent years, it can be formed into a complicated shape. On the other hand, if the knife A is inserted into the knife insertion groove 3 in this state, the knife holding base 2 will warp. Therefore, after laser processing, finishing processing is performed using a router.

The knife holding stand 2 to which the knife A is fixed is attached to a punching press (not shown) together with a thin iron plate 119, a sheet 10 made of paper, and a back plate 4. In this case, the blade height of the knife A is There is an error in the blade height, and the blade height slightly changes at the bent portion 5 of the knife A when the knife A is inserted into the knife insertion groove 3. The blade height adjustment work is performed by the operator.

The above adjustment work is performed by pasting high-low paper such as tape 7 between the thin iron plate 11 and the back plate 4 at the part where the blade height of the knife A is low (see Fig. 6). By bending the thin iron plate 11 at that portion, errors in the blade height can be absorbed.

However, the above-mentioned adjustment work requires a highly skilled and highly skilled person and is very complicated.

Therefore, in recent years, a knife B shown in FIG. 7 has been developed.

As shown in the figure, the knife B has a tapered thin wall portion formed on its back portion 8, and is easily deformed by compression due to this thin wall portion.

Therefore, in the knife B having the above configuration, the knife holding base 2
The thin iron plate 11 is inserted and fixed into the knife insertion groove 3 of the thin iron plate 11. When the sheet 10 and the back plate 4 are attached to a punching press and a test punch is performed, the back part 8 hits the thin iron plate 11 and is easily compressed, and the height of the knife B is partially adjusted. The height of the blade automatically becomes uniform.

However, in the knife B having the above configuration, as described above,
Since a tapered thin wall portion is formed on the back portion 8, when the knife B is press-fitted into the knife fitting groove 3, a large warpage occurs in the knife holding base 2.

As a result, when punching press processing is performed, as shown in FIG. 8, the tip of the cardboard 12, for example, being conveyed by a chain conveyor (not shown) comes into contact with the cutting edge 1 of the knife B on the knife holder 2. ,t! There is a problem in that the J cardboard 12 is not transported smoothly.

In particular, in recent years, with the increase in speed of punching press processing, the gap H between the top surface of the cardboard 12 and the cutting edge 1 of the knife B is often set small (for example, 4 to 5 m) (the above tendency is large). .

Furthermore, the contact area of the thin wall portion of the back portion 8 of the knife B with the side wall of the knife insertion groove 3 is reduced, and the knife holding base 2 is reduced.
There is also the problem that the holding force for the knife B is reduced.

Therefore, the present invention was devised in view of the above circumstances, and it is possible to easily adjust the blade height dimension of the knife when performing punching press processing, and to improve the retention of the knife on the knife holder. It is an object of the present invention to provide a knife having a structure that can prevent warping on a knife holder without reducing force.

[Means for solving problems]

The main means adopted by the present invention to achieve the above object is to provide a sheet punching knife which is fitted and fixed into a knife insertion groove formed in a knife holder and whose back part is formed with a thin wall. , is a knife in which the back portion is repeatedly bent in the direction of its thickness.

[Action/Effect]

Since the knife according to the present invention is configured as described above, even if the back part is thin, it is repeatedly bent in the direction of its thickness, so that this part comes into contact with the side wall of the knife insertion groove. The area can be secured. As a result, the holding force of the knife holding stand against the knife is enhanced,
Furthermore, since the pressure force applied to the side wall of the knife insertion groove is made uniform, the knife holding base is less likely to warp.

Furthermore, when adjusting the blade height of the above-mentioned knife, the back of the high-height part of the knife strongly hits the thin steel plate and is easily compressed, so that the blade height of this knife is automatically made uniform. Therefore, even an inexperienced worker can easily carry out this adjustment work.

In addition, since the back portion is repeatedly bent in the direction of its thickness as described above, when the knife is inserted into the knife insertion groove of the knife holder, the back portion bends according to the width dimension of the knife insertion groove. Or, due to the stress acting intensively on the contact part of the side wall of the knife insertion groove with the back part,
Since the contact portion is partially bent, it is also possible to omit finishing processing of the knife insertion groove using a router.

(Examples) Hereinafter, examples embodying the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

It should be noted that the following examples are examples embodying the present invention, and are not intended to limit the technical scope of the present invention.

Here, FIG. 1 tag, (bl, (C1) represents a knife according to an embodiment of the present invention,
is a perspective view, the same figure (mountain in the same figure) is a plan view taken along the arrow E in the same figure (a), the same figure (C) is a cross-sectional view taken along the arrow F-F' in the same figure (al), and Fig. 2 shows the above-mentioned knife holding the knife. A side sectional view of the knife in a state where it is fitted and fixed in the knife insertion groove of the stand and the blade height dimension is adjusted, FIG. 3 is a perspective view of a knife according to another embodiment of the present invention,
FIG. 4 shows a knife according to still another embodiment of the present invention, and is a view corresponding to FIG. 1(e).

Furthermore, the conventional knife A shown in FIGS. 6 and 7,
Elements common to those in B will be described using the same reference numerals.

The knife C according to this embodiment is shown in FIG. 1+a1. (bl
.

As shown in (C), a thin tapered back portion 8' is further bent repeatedly in a wave-like manner in the direction of its thickness.

The above-mentioned wave shape is formed by press working within the range of the wall thickness of the knife C (portion indicated by t in the figure (bl)).

In the knife C configured as described above, when the knife C is inserted into the knife insertion groove 3 formed in the knife holding base 2, the convex side of the back portion 8' formed in a wave shape is inserted into the knife insertion groove 3. The knife C is in contact with the side wall of the groove 3, and in combination with the springiness produced by being formed into a wave shape, the knife C
A sufficient contact area between the blade and the side wall of the knife insertion groove 3 can be ensured. As a result, the holding force of the knife holding base 2 against the knife C is enhanced.

Furthermore, since the back part 8' of the knife C is formed in a wave shape and has spring properties, the knife C is inserted into the knife insertion groove 3 having an uneven width immediately after being formed through the knife holding base 2 by laser processing. Even in the case where the knife fitting groove 3 is inserted, the back part 8' is inserted while being bent along the knife fitting groove 3 having a non-uniform width dimension, or the back part 8' of the side wall of the knife fitting groove 3 is inserted. Because the stress that acts intensively on the contact area with '' causes the contact area to partially bend, it is also possible to omit finishing processing using a router after laser processing.

Then, the knife holding stand 2 having the knife C fitted and fixed in the knife fitting groove 3 is attached to the thin iron plate 11. When adjusting the blade height of the knife C by attaching it to a punching press (not shown) together with the sheet 10 and the back plate 4, test punching is performed to remove the high blade height of the knife C. The back portion 8' corresponding to the blade is easily compressed by being pressed against the thin iron plate 11 (see FIG. 2), and the blade height is automatically adjusted to be uniform.

Therefore, when the operator adjusts the blade height of the knife C, advanced techniques are not required, and the adjustment can be easily performed.

A knife G according to another embodiment shown in FIG. 3 has a back portion 8' having a plurality of tongues 9 bent alternately in the thickness direction.

A knife D according to yet another embodiment shown in FIG. 4 has a tooth tip l' having a single side edge portion, instead of the knife C having the tooth tip l having both side edge portions. It is configured.

[Brief explanation of drawings]

Fig. 1 (al, bl, (cl) represents a knife according to an embodiment of the present invention, the figure +a) is a perspective view, the figure 1) is the E arrow view in the same figure (Hatake) Plan view, same figure (
C) is a sectional view taken along the line F-F' in the figure (al), and FIG. 2 is a side sectional view with the knife fitted and fixed in the knife insertion groove of the knife holder and the blade height dimension adjusted. FIG. 3 is a perspective view of a knife according to another embodiment of the present invention, FIG. 4 is a perspective view of a knife according to still another embodiment of the present invention, and FIG. 6 and 7 are perspective views showing the state before the knife is attached to the knife holder, and are for explaining the snowscape technology of the present invention.
Each of the figures shows a conventional knife, and is a view corresponding to FIG. 2, and FIG. 8 is an explanatory view when punching and press processing is performed. [Explanation of symbols] 1.1'...Blade tip 2...Knife holding stand 3...
・Knife fitting large groove 8'... Back 9... Tongue pieces C, D, G... Knife.

Claims (1)

[Scope of Claims] A knife for sheet punching that is fitted and fixed into a knife insertion groove formed on a knife holder and has a thin back part, the back part of which is repeatedly bent in the direction of its thickness. A sheet punching knife featuring: