JPH05177588A - Cutting device - Google Patents

Abstract

PURPOSE:To provide a cutting device which presents fine workmanship of cutting. CONSTITUTION:A cutter 21 held rotatably round an axis 25 is used to form a cutting line whose cutting direction differs 180 deg., wherein one step of vibration is given in radial direction to the position of cutter tip 21a in the 90 deg., 45 deg., 0 deg., 315 deg., and 270 deg. positions in case the axis 25 is rotated 180 deg. round the position of the cutter tip 21a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device such as a cutter used for an automatic cutting plotter or the like, and more particularly to a cutting device capable of beautifully cutting a corner or the like.

[0002]

2. Description of the Related Art A cutting device of interest to the present invention is disclosed in, for example, Japanese Patent Laid-Open No. 61-109692.

FIG. 4 shows a schematic view around the cutter of the cutting device disclosed in the above publication, and FIG. 5 shows a state in which the cutting is performed.

Referring to FIG. 4, the cutter 21 is attached to the cutter holder 14 via a cutter attachment shaft 22.
By offsetting the shaft center 25 of the cutter holder 14 and the tip of the cutter 21 to provide an offset, the cutter holder 14
As the cutter moves, the cutter 21 receives frictional resistance from the sheet 23 and a torque acts on the cutter holder 14 so that the cutter 21 naturally moves in the tangential direction of the cutting line.

When the tip 21a of the cutter 21 is floated from the sheet 23, the cutter mounting shaft 22 is rotated by the magnetic force between the magnet 14a provided on the cutter holder 14 and the magnet 22a provided on the cutter mounting shaft 22. As a result, cutter 2
The blade edge of No. 1 is oriented in a fixed direction, and the initial position direction of the tip 21a of the cutter 21, that is, the direction of the starting point of the cutting line is fixed.

Next, the manner in which the cutting line k is formed by the cutter 21 will be described with reference to FIG. The cutter 21 cuts in the direction of arrow b1. Cutter 21 at point c
Is directed in the direction of arrow b2. At this time, the shaft center 25 of the cutter holder 14 moves along the dotted line indicated by b3. As a result, the cutter 21 faces from the triangle shown by the solid line to the triangle shown by the dotted line. Here, the base of the triangle represents the portion 21a of the cutter 21, and the diagonal portion thereof represents the portion 21b.

[0007]

When the cutter shown in FIG. 4 is used to cut as shown in FIG. 5, the blade of the cutter 21 does not rotate at the point c as shown by the triangle in FIG. Not exclusively. That is, as shown in FIG.
There is a case where 1 is twisted and the part of the cutter 21a is fixed in the direction shown by b1, and only the part of the cutter 21 on the side of the cutter mounting shaft 22 faces the direction shown by b2. FIG. 7 shows a view corresponding to FIG. 4 in the state shown in FIG.
As a result, as shown in FIG. 6, the cutting line is not formed well at 90 ° at the point c, and the corners of the cutter 21 are rounded, and especially when the cutter 21 is turned over 180 °, the blade direction of the cutter 21 is reversed, so that it is caught. The sheet 23 may be damaged.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a cutting device capable of beautifully performing desired cutting.

[0009]

In a cutting device according to the present invention for cutting a sheet-like object by moving a holder holding a cutter, the center position of movement of the holder is displaced from the tip position of the cutter. ing. The cutting device includes means for moving the holder in the first direction while the cutter is in contact with the object, and means for temporarily stopping the holder and then moving the cutter in the second direction different from the first direction. Including and At the stop position, the holder is rotated in an arc shape around the tip of the cutter, and during rotation of the holder, the holder is vibrated in the direction normal to the side of the arc where the cutter tip is not located.

[0010]

When changing the direction of the cutter from the first direction to the second direction, the holder is not rotated directly by rotating the holder around the tip of the cutter in the arc shape as in the conventional case.
In the meantime, since it is made to vibrate in the direction of the normal line of the arc once, the blade of the cutter is not twisted and the blade does not rotate as desired.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main part of a control unit of a cutting device according to the present invention. Referring to FIG. 1, a cutting device according to the present invention is connected to an input device 11 for inputting a desired cutting line, a CPU 12 for controlling the entire device, a CPU 12 for controlling the entire device, and a predetermined device. And a ROM 15 for storing the program A of. Cutter holder 14
Is connected to the cutter holder rotating unit 13 and is rotated by the CPU 12 by the program A stored in the ROM 15.

The program A is a program in which a force is applied to the outward direction of the circumference several times when the cutter 21 rotates. The contents will be described below.

FIG. 2 is a diagram showing the locus of the shaft center of the cutter holder 14 when the cutter 21 is rotated by 180 °. Figure 2
Referring to, when the shaft core 25 is rotated 180 ° from the start point to the end point around the tip 21a of the cutter 21, the shaft core 2
5 is starting point 90 °, 45 °, 0 °, 315 °, end point 270
The operation of pulling back toward the outside of the rotation is performed at each of the 5 positions. As a result, the cutter 21 is not vibrated, and the cutter 21 is not twisted or caught.

The angle at each position mentioned here is an absolute angle with respect to the position of the cutter tip 21a.

Next, the actual trajectory of the cutter holder 14 will be described with reference to FIG. In the figure, one step is shown between black circles.

Referring to FIG. 3, the amount by which the shaft core 25 is pulled back in the radial direction with respect to the position of the cutter tip 21a is 0.
There are two steps in the axial direction at °, 90 °, 180 ° and 270 °, and one step at both axes at 45 °, 135 °, 235 ° and 315 °. Here, each step indicates a step of a step motor that drives the cutter holder rotating portion 13.

[0017]

As described above, according to the present invention, when the cutter is moved from the first direction to the second direction to cut an object, the holder is formed into an arc shape with the tip of the cutter as the center. When rotating, the cutter vibrates in the normal direction of the arc, so the blade of the cutter twists and the orientation is different between the upper and lower parts, or the tip of the cutter gets caught and the desired cutting cannot be done. There is no such thing. As a result, it is possible to provide a cutting device that can beautifully perform desired cutting.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a cutting device according to the present invention.

FIG. 2 is a diagram showing a movement of a cutter holder when the cutter is rotated by 180 °.

FIG. 3 is a diagram showing a trajectory of an actual carriage in the case of FIG.

FIG. 4 is a schematic view showing a cutter unit of a cutting device to which the present invention is applied.

FIG. 5 is a diagram showing a state at the time of cutting with a cutter.

FIG. 6 is a diagram for explaining a problem in the present invention.

FIG. 7 is a diagram for explaining a problem in the present invention.

[Explanation of symbols]

 11 Input Device 12 CPU 13 Cutter Holder Rotating Part 14 Cutter Holder 15 ROM 21 Cutter 23 Sheet 25 Shaft Core

Claims (1)

[Claims] 1. A cutting device for cutting a sheet-shaped object by moving a holder holding a cutter, wherein a center position of movement of the holder is displaced from a tip position of the cutter, A means for moving the holder in a first direction in a state of being in contact with the object; and a means for temporarily stopping the holder and then moving the holder in a second direction different from the first direction. Means, in the stop position, the holder is rotated in an arc shape about the tip of the cutter, and while the holder is rotating, the holder is directed in a direction normal to a side of the arc without the cutter tip. A cutting device including a vibrating means.