JP3226332B2 - Cutting edge control method for cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting edge control method for a cutting device for cutting a sheet or the like.

[0002]

2. Description of the Related Art Conventionally, as a cutting device for cutting a sheet or the like, a pen carriage equipped with a cutting pen is moved in a left-right direction (X-axis direction) and a front-rear direction (Y-axis direction) relative to a cutting sheet. A configuration in which the control is performed is generally known. As a cutting pen used in such a cutting device, for example, as described in JP-A-61-152391, a cutter mounting shaft is rotatably held on a columnar cutter holder and A structure is known in which a cutter having an inclined cutting edge is attached to the tip of the cutter mounting shaft at the lower end, and an offset is provided between the lowermost end of the cutting edge and the axis of the cutter mounting shaft. With such a configuration of the cutting pen, the cutting edge can always be directed in the direction of travel of the cutter, thereby making it possible to smoothly perform cutting of a bent straight line or curve.

By the way, in order to actually perform cutting of a figure using the above-described cutting apparatus, after cutting a figure, the cutting edge is lifted from the sheet surface, and when cutting to the next figure is performed, the cutting of the cutting edge is performed. The orientation needs to be corrected. Conventionally, this correction is usually performed by storing the orientation of the cutting edge when the previous graphic has been cut, and setting the cutting start position of the next graphic based on the stored memory.

[0004]

However, when the cutting edge is lifted after the previous figure has been cut, stress is generated at the cutting edge due to the elasticity of the cutting sheet or the like and the rigidity of the cutting device itself. Because of the rotation, the conventional correction method as described above cannot accurately correct the start of cutting the next figure, so that the cut figure does not close or extraneousness occurs immediately after the start of cutting the next figure. There was a problem that the part was cut off.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in a cutting apparatus for a sheet or the like, it is possible to prevent the cutting edge from being carelessly rotated by the stress accumulated on the cutting edge when the cutting edge is lifted after the completion of cutting. The purpose is to be able to prevent it.

[0006]

A cutting edge control direction of a cutting device according to the present invention is provided such that a cutter holder is disposed with its axial direction being vertical, and a cutter holder is rotatable around the axis of the cutter holder. A cutter having an inclined cutting edge at the lower end thereof, wherein the cutting device is provided with a predetermined offset between the lowermost end of the cutting edge and the axis of the cutter holder. Before the series of cuttings is completed and the cutter holder is lifted, the cutting edge of the cutter is forcibly forced by a predetermined angle in a direction opposite to the rotating direction of the cutting edge of the cutter immediately before the series of cutting is completed. It is characterized in that it is made to rotate in the direction.

[0007]

When the cutting by the cutting device is completed, the cutter holder is forcibly rotated in a predetermined direction before the cutter holder is raised, and the cutting edge of the cutter is moved to the position immediately before the end of a series of cutting. Since the blade is rotated by a predetermined angle in the direction opposite to the rotation direction of the blade, the width of the cut edge of the sheet or the like is widened. Thereby, the stress accumulated on the cutting edge is released, and the cutting edge is prevented from rotating carelessly when the cutting edge is raised.

[0008]

Embodiments will be described below with reference to the drawings. FIG. 1 is a sectional view of a cutting pen according to an embodiment of the present invention. The cutting pen 1 of this embodiment includes a cylindrical holder 2 formed of a synthetic resin or the like and arranged so that the axial direction is vertical. The cylindrical holder 2 is formed with a flange portion 3 which is engaged with a pen carriage (not shown) substantially at the center of the outer peripheral portion. The upper and lower portions are formed through small-diameter insertion holes 4 located on the axis of the cylindrical holder 2. A large-diameter upper space 5 and a lower space 6 are formed respectively. Bearings 7 and 8 are respectively fitted to upper and lower ends of the insertion hole 4, and a disc-shaped lid 9 is
Is fitted.

A rotating pin 11 which forms a part of the cutter rotating body 10 is inserted through the insertion hole 4. Here, the cutter rotating body 10 includes a rotating pin 11 and a cutter holding unit 12 fixed to a lower end of the rotating pin 11. The rotating pin 11 is supported at its upper and lower ends by bearings 7 and 8 so as to be rotatable around an axis 13, and has an upper end surface in contact with the lower surface of the lid 9. An E-ring 14 is fitted to the upper end of the pivot pin 11 to prevent the pivot pin 11 from dropping out of the insertion hole 4. Further, the cutter holding portion 12 is provided so that the upper portion is loosely inserted into the lower space 6 of the cylindrical holder 2, and has a columnar crocodile portion 15 made of synthetic resin or the like, and an outer periphery of the crocodile portion 15 in the direction of the axis 13. The ring is formed of a metal sleeve ring 16 which can move forward and backward.

The crocodile opening 15 is an upper jaw piece 15a which is a movable piece.
The upper jaw 15a and the lower jaw 15b are formed with grooves on the inner surfaces of the upper jaw 15a and the lower jaw 15b so that the flat cutter 17 can be fitted along the axis 13. ing. Here, the cutter 17 has an inclined cutting edge 17a at the lower end. Further, when the cutter 17 is mounted, the cutting portion 18 is the lowermost end of the cutter 17.
And an axis 13 is provided so as to maintain an offset t. A projection 19 is provided on the open end side of the crocodile portion 15 to prevent the sleeve ring cylindrical ring 16 from falling off in the circumferential direction.

The cutting pen 1 is mounted on a pen carriage of a cutting device, and cuts the cutting sheet 20 into a predetermined shape under the control of a microcomputer. At that time, the cutter rotating body 10 freely rotates while the cylindrical holder 2 is moving, thereby
The cutting edge 17a always cuts the cutting sheet 20 facing forward in the direction of travel of the cylindrical holder 2. The length of the offset t is, for example, 0.24 mm (for the soft PVC sheet 0.25 mm) when the thickness of the cutting sheet 20 is 0.24 mm.
(05mm, adhesive layer 0.03mm, mount 0.16mm)
In this case, it is preferable to set the distance to about 1 mm.

In this embodiment, before the cutting of one figure is completed and before the cutting edge 17a is raised, the rotation of the holder 2 is controlled in a direction opposite to the rotation direction of the cylindrical holder 2 before the end of the cutting. I have to. In that case,
The rotation angle is optimally set to, for example, about 45 °. When such a cutting edge control is performed, the cutting edge 17 is reduced due to the elasticity of the cutting sheet 20 and the rigidity of the cutting device itself.
The stress that accumulates at a is released, and it is possible to prevent the blade edge 17a from rotating carelessly when the blade edge 17a is raised. Further, the movement of the cutting edge 17a due to the play of the carriage can be reduced.

FIG. 2 is a flowchart for executing the above-described rotation control of the present embodiment. In addition, S1 to S5 indicate each step. In this flow, when you start,
First, in S1, it is determined whether the cutter state of the next operation is UP (pen-up) or DOWN (pen-down). If it is in the DOWN state, it means that the cutting operation of the figure has not been completed yet, so the process proceeds to S2, matches the direction of cutting the cutting edge in the DOWN state, and returns.

On the other hand, if it is determined in step S1 that the cutter is in the UP state, then in step S3, it is determined whether the cutter state in the immediately preceding operation is UP or DOWN. When it is in the UP state, it returns as it is, and when it is in the DOWN state,
Since cutting of one figure is completed and the cutting edge is switched from DOWN to UP, go to S4,
Hold the cylindrical holder 2 45 degrees in the direction opposite to the rotation direction of the immediately preceding blade edge.
° After rotating, control to raise the cutter. Then, in S5, the blade of the cutter is moved to the target position, and the process returns.

In the above embodiment, the rotation of the cylindrical holder is controlled by about 45 ° in the direction opposite to the rotation direction of the immediately preceding blade at the end of cutting. Various patterns can be considered as shown below, and the best method can be selected according to the type of the cutting device. Rotate in a certain direction by a certain angle. Rotate by a fixed angle in a fixed direction, and then return to the original position. It is turned by a certain angle in a certain direction, and then twice by an opposite direction. It is turned by a certain angle in a certain direction, and then turned by a double angle in the opposite direction, and then returned. The above-mentioned “constant direction” is referred to as a “direction corresponding to the direction immediately before the end of cutting”.

[0016]

Since the present invention is constructed as described above, in a cutting apparatus for a sheet or the like, the cutting edge is prevented from being accidentally rotated by the stress accumulated on the cutting edge when the cutting edge is lifted after the cutting is completed. can do.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cutting pen according to an embodiment of the present invention.

FIG. 2 is a flowchart for executing rotation control of a cutting pen according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting pen 2 Cylindrical holder (cutter holding body) 13 Axis 17 Cutter 17a Cutting edge 18 Cutting point t Offset

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-61-152391 (JP, A) JP-A-62-218097 (JP, A) JP-A-63-232998 (JP, A) JP-A-2- 262995 (JP, A) JP-A-2-152795 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B26D 5/00

Claims (1)

(57) [Claims] 1. A cutter holder having an axial direction perpendicular to a cutter holder, a cutter rotatably provided around the axis of the cutter holder, and a cutter having an inclined blade edge at a lower end, wherein the blade edge is provided. A cutting edge control method for a cutting device, wherein a predetermined offset is provided between the lowermost end of the cutter holder and the axis of the cutter holder, wherein a series of cutting by the cutting device is completed and the cutter holder is raised. A cutting edge of the cutting device, wherein the cutting edge of the cutter is forcibly rotated by a predetermined angle in a direction opposite to a rotation direction of the blade edge of the cutter immediately before the series of cutting ends. Control method.