JPH0236093A - Control method for double edge cutter in automatic cutter - Google Patents

Abstract

PURPOSE:To extend the usable time of a cutter and to increase the durability thereof by cutting the sheet body to be cut with only the edge of one side by controlling the direction of a double edge cutter by its rotating and executing cutting until the other edge is worn by replacing with it after this edge being worn. CONSTITUTION:The lower end of a double cutter 16 is penetrated to the sheet body 27 to be cut of on a table 4, the cutter 16 is fed in the specified direction for the table face with controlling the edge angle of this cutter 16 by it rotation and the sheet body 26 to be cut is cut in specified shape. In this case, the direction of the double edge cutter 16 is controlled by its rotation so that one part of the edge selected of the right and left edge of the cutter 16 is located prior to the other part edge for the cutting direction at all times. In case of this one part edge being worn, the other part edge is selected by converting 180 deg. the direction of the double edge cutter 16 and the direction of the cutter is controlled by rotating it so that this other part edge becomes prior to the cutting direction all the time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling a double-edged cutter in an automatic cutting machine.

[Conventional technology]

As shown in Fig. 6, a cutter for an automatic cutting machine has blades a and b formed on both left and right sides of the lower part of the cutter, centering on the longitudinal central axis S of the cutter, and thereby cuts in two directions A, which are 180 degrees apart. A so-called double-edged cutter N having a cutting direction in B is known. In an automatic cutting machine using this double-edged cutter N, when the cutting direction is changed at a gentle angle α as shown in Figure 7, the 5-double-edged cutter N is
The blade angle is changed according to this angle, and the blade used for cutting remains unchanged. However, when the cutting direction is changed at a steep angle β as shown in FIG. 7A.

The direction, that is, the rotation angle, of the double-edged cutter N is controlled so that the wide side surface d of the double-edged cutter N faces the cutting direction at the shortest angle, and in this case, the blade located at the front in the cutting direction is replaced. That is, up to the sharp angle conversion point H, the cutting edge was in the forward position, and the cutting was performed at the sharp angle conversion point H.
Thereafter, the blade a, which has been located at the rear, is located at the front, and cutting after the conversion point is performed by this blade a.

[Problem that the invention seeks to solve]

As mentioned above, when cutting a sheet object while controlling the direction of the blade angle of a double-edged cutter, especially when cutting closed shapes, one of the two blades is used more frequently than the other. The number of blades on one side tends to wear out quickly. When one blade becomes no longer sharp, the cutter must be replaced even if the other blade is still fully usable, which inevitably reduces the durability of the cutter.

The present invention aims to eliminate the above-mentioned defects.

[Means to solve problems]

In order to achieve the above object, the present invention penetrates the lower end of a double-edged cutter into a sheet to be cut on a table, and sets the blade angle of the double-edged cutter so that the wide side surface of the double-edged cutter is always parallel to the cutting direction. In an automatic cutting machine that feeds the double-edged cutter in a predetermined direction in a plane parallel to the table surface while controlling the rotation of the cutter to cut the sheet on the table into a predetermined shape, , The direction of the double-edged cutter is rotationally controlled so that the selected one of the left and right blades of the double-edged cutter is always positioned ahead of the other blade in the cutting direction, and when this one blade wears out, The direction of the double-edged cutter is changed by 180 degrees to select the other blade, and the direction of the double-edged cutter is rotationally controlled so that the other blade is always at the front in the cutting direction.

〔Example〕

The structure of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a cutting head of an x-y numerically controlled automatic cutting machine, which is supported so as to be movable in a predetermined direction within a plane parallel to the upper surface of a vacuum table 4.
y is connected to a numerical control device. 6 is a mounting frame fixed to the housing 8 of the head 2 via a ball bearing.

The external tubular body 10 is rotatably supported about an axis perpendicular to the table 4 so that it does not move in the vertical direction. Reference numeral 14 denotes a rotation shaft disposed on the inner tube body 12 fixed to the outer tube body 10 so as to be movable up and down. A protrusion (not shown) provided on the side is a long hole (not shown) formed in the inner pipe body 12 in the longitudinal direction thereof.
It is fitted so that it can slide freely. The rotating shaft 14 is linked to a known elevating drive mechanism (not shown) built into the head 2. Reference numeral 16 denotes a double-edged cutter in which blades a and b are formed on both left and right sides of the tip plate portion centered on the central axis in the longitudinal direction, and the holder portion 18 thereof is as shown in FIG.
The holder portion 18 has a circular cross section, and flat surfaces 18a and 18b are formed on both sides of the holder portion 18 at an angle of 180 degrees from each other. The holder portion 18 is connected to the rotating shaft 14
The cutter holder part 18 is fixed to the lower part of the one-rotation shaft 14 by a fixing screw 22 that is slidably inserted into a cylindrical holding hole formed at the lower part of the cutter holder part 18 and is pressed against the flat surface 18b of the holder part 18. There is.

Next, the operation of this embodiment will be explained.

When the elevating drive mechanism is driven by the controller and the rotary shaft 14 is lowered to a predetermined position, the tip of the double-edged cutter 16 penetrates the sheet material 26 to be cut on the breathable underlay sheet 24 on the table 4.

In this state, while the head 2 is sent in a predetermined X-Y direction, the controller controls the rotation of the external tubular body 10 and controls the blade angle of the single double-edged cutter 16. The double-edged cutter 16 is such that one of the blades a and b, which is selected and set first, for example, the blade, is located at the front with respect to the movement direction of the head 2 as shown in FIG. The angle is controlled so that the wide side surface d of the double-edged cutter 16 is parallel to the direction. Therefore, as shown in FIG.
When the direction is changed at a sharp angle of 315 degrees in the negative direction at point H and 45 degrees in the positive direction, the double-edged cutter 16 is not rotated at the shortest angle of +45 degrees at point H as in the conventional case, but -31
Rotate it 5 degrees.

As a result, one of the selected blades can always be directed first in the cutting direction, and the sheet material 26 to be cut can be cut with the blade b at the end. If the selected blade is worn out and cannot cut, loosen the fixing screw 22 and remove the double-edged cutter 1.
6 is rotated 180 degrees with respect to the rotating shaft 14 and fixed to the rotating shaft 14 with a screw 22, and the other blade a is used to cut the sheet material 26 in the manner described above. In the above, the double-edged cutter 16 was attached to the rotating shaft 14 by changing the angle by 180 degrees and replacing the left and right blades a and b. By rotating the blade 180 degrees, the left and right blades a and b can be replaced.

In this case, as shown in FIGS. 4 and 5, the cutter holder portion 18' and the flat surface 18'a may be provided only on one side.

〔effect〕

As described above, in an automatic cutting machine using a single double-edged cutter, the present invention first cuts a sheet material with only one blade selected from the left and right blades, and when this blade wears out, the other blade is used. By changing the cutter and cutting until it wears out, the usable time of the double-edged cutter can be extended and its durability can be improved.Also, the controller's rotation control for the double-edged cutter always only controls one blade. There is an effect that only the rotation control is required when using the cutter, and complicated rotation control of the cutter is not required.

[Brief explanation of the drawing]

1 is a side view, FIG. 2 is a sectional view, FIG. 3 is a sectional view, FIG. 4 is a sectional view of another embodiment, and FIG. 5 is the same. 6 is an explanatory diagram, FIG. 7 is an explanatory diagram, and FIG. 8 is an explanatory diagram. 2... Cutting head, 4... Vacuum table, 6
...Mounting frame, 8...Housing, 10...Outer tube, 12...Inner tube, 14...Rotating shaft, 16...
・Double-edged cutter 18... Holder part, 20... Holding hole, 22... Fixing screw, 26... Sheet object to be cut,

Claims (1)

[Claims] (1) Penetrate the lower end of the double-edged cutter into the sheet to be cut on the table, and rotate and control the blade angle of the double-edged cutter so that the wide side of the double-edged cutter is always parallel to the cutting direction. In an automatic cutting machine that feeds the paper in a predetermined direction in a plane parallel to the table surface to cut the sheet material on the table into a predetermined shape, when cutting, the left and right blades of the double-edged cutter The direction of the double-edged cutter is rotationally controlled so that one of the selected blades is always positioned ahead of the other blade in the cutting direction, and when this one blade wears out, the direction of the double-edged cutter is changed to 180 degrees.
1. A method for controlling a double-edged cutter, characterized in that the other blade is selected by converting degrees, and the direction of the double-edged cutter is rotationally controlled so that the other blade is always at the leading end with respect to the cutting direction.