FR2681808A1 - TOOL FOR CUTTING. - Google Patents

Abstract

Purpose: to obtain a cutting tool, in which the cutting resistance is small, and the edge and the main body are rigid, able to easily perform grinding, so as to solve the problems of grinding the edge involved in the classic cutting tool. Constitution: a cutting tool (8) has a blade (12) at the upper end part, in its longitudinal direction, and has a cutting part (16) for cutting sheet materials according to the pattern of cutting, on the side, in the longitudinal direction. The cutting portion (16) forms the cutting front end portion (13) defining cutting surfaces (14) extending planarly on both sides of the ridge (13a), towards the main body (8a). ), and cavities adjacent to the cutout surface (14) formed on the cutout front end portion (13), opposite to the main body (8a).

Description

The present invention relates to a cutting tool

  for cutting sheet material or the like.

  Fig. 9 shows a cutting tool of a reciprocating die system mounted on an automatic die cutting machine for cutting a stacked sheet material on a cutting table. The cross-sectional shape of this cutting tool 50 constitutes a cutting surface 51, as shown in Figure 10, extending linearly from the ridge

  to the side of the cutting body.

  The cutting tool, mounted on the automatic cutting machine for cutting sheet material, such as layered garment, moves back and forth during the cutting action, and cuts the material As the edge is worn during the cutting procedure, the cutting machine is provided with a grinding attachment, and the cutting tool is ground or grinded during the cutting procedure, way that the sheet material can be cut from

adequately.

  However, in the cutting tool 50 as shown in FIGS. 9 and 10, it is necessary to grind the entire surface of the cutting surface 51 in order to grind the used edge so as to sharpen it, and the grinding takes a long time, which leads to a reduction in cutting efficiency. This also gives rise to many other problems, such as the excessive consumption of the grinding member such as a grinding stone, and the production of a grinding machine. In addition, since the area of the cutting surface 51 is wide, the resistance to cutting

  realized by the cutting tool 50 becomes large.

  Accordingly, it has been proposed a cutting tool whose wall thickness of the main body of the cutting tool has been reduced, as shown in Figures 11 and 12 The virtual line indicated the cutting tool shown on the In this cutting tool 52, since the area of the cutting surface 53 is smaller, the problems due to the rectification as mentioned above can be solved, and the resistance

  the clipping tool can be deleted.

  However, the rigidity of the main body of the cutting tool is lowered due to the reduced thickness of the cutting tool, so that the cutting tool can

  be deformed during the cutting procedure.

  As another conventional cutting tool, in addition to that described above, a cutting tool as described in Japanese Patent No. 62-176194 is known. FIG. 13 shows the cutting tool 54 described in this document. outer surface of the cutting tool, except for a cutting surface 55, being coated with an antiwear element 56, such as titanium nitride, and the plane defining the cutting direction of the cutting edge;

  cutting having the shape of a concave surface.

  In the cutting machine having this cutting tool 54, when the cutting tool 54 is worn during the cutting procedure, it is described that only the grinding or grinding of the cutting surface 55 on the non-cutting side. coated, using the grinding fixture, can maintain the cutting edge

always sharpened.

  In this prior art, although the problems of grinding time, grinding dust and consumption of grinding stone can be solved, since the cutting edge is extremely sharp and is made of a hard material, the Rigidity and hardness of the cutting edge are low, and breakage or other problems can be induced during the cutting procedure. Thus, in view of the above problems, the main object of the invention is to provide a cutting tool in which the cutting resistance is low and the cutting edge and the main body are rigid, capable of easily achieving a rectification, so as to solve the problems due to the rectification of the edge involved

  in the classic cutting tool.

  To achieve this object, the invention provides a cutting tool for a cutting machine, having a push blade for cutting a sheet material, formed at the upper end portion, in the longitudinal direction of a main cutting body, and cutting parts for cutting the sheet material according to the cutting pattern, formed at the side portion of the longitudinal direction, wherein the cutting parts for cutting the sheet material according to the have a cutting leading end portion, defining cutting surfaces extending flat on both sides of the cutting edge, towards the main body portion, and an arcuate cavity formed between the cutting edge front end cutting portion and the main body portion, connected adjacent to the cutting surfaces formed on the portion of ex tremité before cutting. To rectify the edge of the cutting tool so constructed, it is sufficient to grind only the flat portion of the head portion prior to cutting, or only the area comprising the main body portion in close proximity behind the cavities arc-shaped, and

the volume to be rectified is low.

  In addition, by cutting with the cutting tool thus constructed, the sheets to be cut, which are sent backwards along the cutting surface, because of the arc-shaped cavities formed in the rear part of the cutting edge area, are temporarily free from contact with the cutting tool, above the cavities, so that the resistance to the cutting tool

  can therefore be decreased.

  Since the cutting edge and the main body have substantially the same shape as in the prior art, the rigidity of the cutting tool is

hard to lose.

  As we know from the present description,

  by forming the cutting tool according to the invention, the time required for the grinding of the cutting tool often requested during the cutting procedure can be reduced, and the cutting time can be shortened, without reducing the rigidity of the cutting edge and the main body, while the consumption of the grinding member, such as a grinding stone, used in

this end can be deleted.

  Furthermore, by forming cavities behind the cutting front end portion, the area of contact between the cutting tool and the sheet material during the cutting procedure is smaller, and the lifting of the cutting materials. sheet together with the cutting tool

can be prevented.

  In addition, during the suction action to maintain the position of the sheet material during the cutting procedure, outside air flows through the cavities formed in the cutting tool, for to cool the heat generated by friction and, therefore, it is also effective to prevent melting of the sheet material in the cutting section,

  suppressing heat production.

  Goals, features and advantages, as well as others, of the invention will be better understood in the

  reading of the detailed description which follows, made in

  FIG. 1 is a schematic plan view showing an automatic cutting machine, FIG. 2 is a longitudinal sectional view schematically showing the cutting head portion, FIG. 3 is a side view of a cutting machine, FIG. A cutting tool according to one embodiment of the invention, Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 11 Figure 12 Figure 12 is a sectional view longitudinal view, on a larger scale, of a cutting tool 8, in the direction of the section line II shown in FIG. 3, is a horizontal sectional view of a cutting head portion shown in FIG. is a longitudinal sectional view for comparing the grinding of the cutting tool 8 shown in Figure 3, with that of the conventional cutting tool 50 is a longitudinal sectional view of the cutting procedure of a maté The sheet material made by the cutting tool 8 shown in FIG. 3 is a longitudinal sectional view showing a cutting tool according to another embodiment of the invention, is a side view showing a conventional cutting tool. , is a longitudinal sectional view of the conventional cutting tool shown in Figure 9, is a side view showing a conventional cutting tool, is a longitudinal sectional view showing the conventional cutting tool shown in Figure 11 , is a longitudinal sectional view representing

  a cutting tool according to the prior art.

  Referring now to the drawing, modes of

  Preferred embodiments of the invention are described below.

  FIG. 1 schematically represents an automatic cutting machine 1 Brush holders having air-permeable bristles 3 are arranged on the entire surface of a rectangular cutting table 2 Sheet materials 4 are stacked in layers on a support surface formed by the ends of the bristles 3, forming a common plane Although not shown, a suction chamber is disposed below the cutting table 2 It is designed to maintain the sheet materials 4 by suction, when cutting, so as not to cause displacement. Above the cutting table 2, a cutting part mounting member 5, capable of moving in the direction of the Y axis, parallel to the shorter side of the table 2, is supported on a support of horizontal frame 6 likely to move in the direction of

  the X axis, parallel to the longest side of the table 2.

  The cutter portion mounting member 5 and the horizontal frame holder 6 are moved by a not shown drive assembly, so that the cutter portion mounting member 5 moves to a desired position on the cutting table 2, and cut sheet materials 4 stacked according to a model form

desired.

  FIG. 2 schematically shows a chopper head portion 7 mounted on the chopper portion mounting member 5. The chopper head portion 7 includes, in its case 7a, a chopper 8, a pickup assembly. 9 for driving the reciprocating tool, and a cutting tool grinding attachment 10, and so on. The drive assembly 9 converts, thanks to its crank arm 9a, the rotational driving force into a reciprocating driving force The grinding attachment 10 rectifies or

  grind the cutting tool 8 in a raised state.

  FIG. 3 is a general side view of the cutting tool 8, FIG. 4 is a longitudinal sectional view, on a larger scale, of the cutting tool 8, in the direction of the section line II of FIG. FIG. 3, and FIG. 5 is a horizontal sectional view of the cutting head portion 7, showing the cutting tool 8 and a grinding member 11 of the fixing device.

rectification 10.

  The cutting tool 8 has, at its upper end portion, a blade 12 for pushing the stacked sheet materials 4, and also a leading end portion 13 for cutting the sheet material 4 stacked on one side of the cutting tool 8 The cutting front end portion 13 forms a cutting surface 14, its two sides being flat, from the edge 13a to the main body portion 8a, and its rear portion to the main body 8a, moderate arc-shaped cavities being formed on both sides of the cutting tool 8 The cutting front end portion 13 and the cavity 15 constitute the part of

  cutting 16 of the cutting tool 8.

  The rectification of the cutting tool 8 during the

  operation of the cutting machine is explained below.

  below. For the grinding procedure, the cutting tool 8 is lifted from the bristles 3 and the sheet materials 4 to be rectified, before the edge 13a is worn to be blunt, to come to a correct position. each shape model of the sheet materials 4 according to the control of a control member

not shown here.

  The grinding unit 11 of the grinding attachment 10 rectifies the cutting surface 14 without changing the cutting angle O between the two grinding surfaces.

  cutting 14 of the cutting front end portion 13.

  FIG. 6 represents the difference in volume of the cutting part to be grinded between the cutting tool 8 of the invention shown in FIG. 6 (a), and the conventional cutting tool, represented in FIG. b), having the same cutting angle O as the cutting tool of the invention The outer peripheral line indicates the cutting tool before being used, and the hatched area indicates the portion of the cutting tool to be cut. grind during use, and the part not comprising the hatched area is the state of the cutting tool

  left until replacement.

  As is known from FIGS. 6 (a), 6 (b), the grinding volume of the cutting tool 8 of the invention is much smaller than that of the tool of FIG.

50 classic cutting.

  FIG. 7 shows the manner of cutting the sheet materials 4 by means of the cutting tool 8 of the invention. When cutting made by the cutting tool 8 according to the invention, in the region of the shaped cavity arc 15 formed behind the cutting front end portion 13, the contact between the sheet materials 4 and the cutting tool 8 is suppressed, so that the frictional resistance is lower than that of the cutting tool conventional, and the resistance to cutting can be reduced. A preferred embodiment of the invention is shown here, but the invention is not limited solely to the previous embodiment. For example, as shown in FIG. 8, the cavity 25 of the cutting tool 20 may be formed linearly between the cutting surface 24 and the main body 20a, to construct the cutting portion 26 together with the cutting front end portion 23, which includes the edge 23a, and other modifications may be be brought to the extent that they do not come out of the mind

authentic of the invention.

  The invention can be implemented in other specific forms, without departing from its spirit or its essential characteristics The present embodiments must therefore be considered, in all their aspects, as being illustrative and not limiting,

  the object of the invention being indicated by the claims

  annexed, rather than the foregoing description, and

  all the variations that are included in the

  meaning and equivalence range of the claims

  are therefore intended to be included here.

Claims (4)

  A cutting tool for a cutting machine having a push blade (12) for cutting a sheet material (4) formed at the upper end portion in the longitudinal direction of a main body cutting (8a), and cutting parts (16, 26) for cutting the sheet material (4) according to the cutting pattern, formed at the lateral portion of the longitudinal direction, wherein the cutting parts (16, 26) for cutting the sheet material according to the model have a cutting leading end portion (13, 23), defining cutting surfaces (14, 24) extending in a planar manner on both sides of the the cutting edge (13a, 23a) towards the main body portion (8a, 20a), and a cavity (15, 25) formed between the leading end cutting portion (113, 23) and the main body portion (8a, 20a), connected adjacent to the cutting surface (14, 24) formed on the   cutting end end portion (13, 23).   Cutting tool for a cutting machine according to claim 1, wherein the cavities (15, 25) are formed on both sides of the cutting part. (16, 26).   3 cutting tool for a cutting machine according to claim 1 or 2, wherein the section of the   cavity (15) has the shape of an arc.   4 cutting tool for a cutting machine according to claim 1 or 2, wherein the section of the   cavity (25) has a linear shape.   Cutting tool for a cutting machine according to claim 1, wherein the cutting portion (16, 26) is ground during operation of the tool cutting.