JP2023023400A - Cutting machine and method for measuring blade width of cutting machine - Google Patents

Abstract

To provide a cutting machine that can optically measure a blade width, utilizing a rotation mechanism that rotates a direction of a blade.SOLUTION: A cutting machine 2 comprises: a cutting head 10 that has a blade 17 for cutting, a lifting mechanism 13 for the blade 17, and a rotation mechanism 12 for the blade 17; a movement mechanism 4 that moves the cutting head 10 in two X and Y directions; and a controller 6 that controls the cutting head 10 and the movement mechanism 4. The cutting head 10 detects presence or absence of the blade 16 on a detection line passing on a predetermined position in the head. The machine, when the rotation mechanism 12 rotates a direction of the blade 16, calculates a blade with of the blade 16 from a rotation angle of the blade 16 at the time when a change in the presence or absence of the blade on the detection line is detected, and optically measures the blade width, using the rotation mechanism 12 provided in the cutting head 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to blade width measurement of a cutter.

In the cutting machine, a substantially straight blade (straight blade) is raised and lowered by a reciprocating mechanism to cut the sheet material. Alternatively, a round blade is rotated instead of a straight blade to cut the sheet material. The blade wears out as it cuts, so it is sharpened on the cutting machine. Cutting and polishing change the width of the blade, and when the position of the cutting edge (tip of the blade) changes, the cutting position with respect to the cutting head changes accordingly. Therefore, it is necessary to measure the blade width (measure the blade edge position) and correct the cutting position.

The applicant proposed advancing a detection pin toward the cutting edge and measuring the cutting edge position from the position where the pin contacts the cutting edge (Patent Document 1: Japanese Patent Publication No. 8-15718). Patent Document 1 also proposes non-contact detection of the cutting edge position using a laser beam.

Tokuho 8-15718

In order to advance the detection pin, it is necessary to add a mechanism such as a stepping motor, which poses problems in terms of both space and cost.

SUMMARY OF THE INVENTION An object of the present invention is to optically measure the width of the blade by using a rotation mechanism that rotates the direction of the blade provided in the cutting machine.

A cutting machine according to the present invention comprises a cutting head having a cutting blade, an elevating mechanism for the blade, and a rotating mechanism for rotating the direction of the blade; A cutting machine comprising a moving mechanism for moving in a direction and a controller for controlling the cutting head and the moving mechanism,
The cutting head comprises detection means for optically detecting the presence or absence of the blade on a detection line passing through a predetermined position in the cutting head,
The blade width of the blade is calculated from the rotation angle of the blade when the detection means detects a change in the presence or absence of the blade on the detection line when the orientation of the blade is rotated by the rotation mechanism. It is characterized by being configured to

The method for measuring the blade width of a cutting machine according to the present invention comprises: a cutting head having a cutting blade, a lifting mechanism for the blade, and a rotating mechanism for rotating the direction of the blade; A method for measuring the blade width of the blade in a cutting machine comprising a moving mechanism for moving the cutting head in two XY directions, and a controller for controlling the cutting head and the moving mechanism,
The cutting head is provided with detection means for optically detecting the presence or absence of the blade on a detection line passing through a predetermined position in the cutting head,
Rotating the direction of the blade by the rotation mechanism and calculating the blade width of the blade from the rotation angle of the blade when the detection means detects that the presence or absence of the blade has changed on the detection line. characterized by

In this invention, the orientation of the blade is rotated using the rotation mechanism provided in the cutting head. When the blade rotates, the blade width seen from the detection means changes, and the presence or absence of the blade on the detection line changes at a certain rotation angle. If the blade width is measured from this rotation angle, the blade width can be measured accurately with a simple configuration. Moreover, since the stepping motor or the like of Patent Document 1 is not required, the device is compact and low in cost.

Preferably, the detection means comprises a laser light source attached to the cutting head on one side of the blade and a light receiving element attached to the cutting head on the other side of the blade. The detection means can be simply configured with a laser light source such as a semiconductor laser and a light receiving element such as a photodiode or pyroelectric element, and can easily detect the presence or absence of the blade.

Preferably, when the detection means detects once the change from the state with the blade to the state without the blade, or the change from the state without the blade to the state with the blade, the angle of rotation of the blade at that time is used to detect the edge of the blade. Calculate width. The blade width can be measured in a single rotation, so the blade width can be measured in a short time.

Preferably, the blade is a straight blade having a straight cutting edge, and the elevation mechanism elevates the blade and rotates the direction of the blade at a plurality of heights to adjust the width of the blade at a plurality of heights. Partial wear of the blade is also detected by measuring . Since the cutting head has a mechanism for raising and lowering the blade, the blade width is measured at multiple heights while raising and lowering the blade with this mechanism. In this way, it is possible to detect that a part of the blade is chipped or that the blade is worn more than others in a specific height range.

Block diagram of the cutting machine of the embodiment FIG. 4 is a diagram showing a blade width measuring method of an embodiment using a laser beam and a light receiving element; A diagram showing a modified blade width measurement method using a camera Flowchart showing the blade width measurement algorithm in the embodiment Diagram showing blade width measurement method (modification) for round blades Flowchart of a modified example showing the width measurement algorithm with a round blade

The following is a preferred embodiment for carrying out the invention.

Examples are shown in FIGS. 1 to 6. FIG. In FIG. 1, reference numeral 2 denotes a cutting machine, which has a cutting bed (not shown) on which one to a plurality of sheet materials to be cut are placed. The moving mechanism 4 moves the cutting head 10 in two directions of XY with respect to the cutting bed. The controller 6 also controls the moving mechanism 4 and the cutting head 10 . In particular, the trajectory (trajectory of the center of the blade 16, etc.) along which the blade 16 is sharpened and the sheet material is cut by the blade 16 is changed according to the change in the blade width of the blade 16.

The cutting head 10 rotates the lifting mechanism 13 , the reciprocating mechanism 14 and the blade 16 by the rotating mechanism 12 . The elevating mechanism 13 raises and lowers the reciprocating mechanism 14 and the blade 16 so that the blade 16 pierces the sheet material and is pulled out from the sheet material. The reciprocating mechanism 14 reciprocates the blade 16 up and down at high speed to cut the sheet material. The blade 16 is, for example, a straight blade, and the cutting edge 17 is vertically straight. The blade 16 is moved up and down with a large stroke by the lifting mechanism 13, and the blade 16 is moved back and forth at high speed by the reciprocating mechanism 14.例文帳に追加However, these movements may be performed by one mechanism.

18 is a laser light source such as a semiconductor laser, and 20 is a light receiving element such as a photodiode or pyroelectric element. The laser light source 18 and the light-receiving element 20 are located on both sides of the blade 16 when viewed from the side, and are fixed to the cutting head 10 and neither move up nor rotate. Also, the laser light source 18 and the light receiving element 20 are arranged at a position higher than the sheet material on the cutting bed. When the light receiving element 20 receives the laser beam, it sends a signal S1 to the controller 6, for example. A polishing device 22 rotates a blade 16 by a rotating mechanism 12 to bring it into contact with the grindstone of the polishing device, and slides the blade 16 against the grindstone of the polishing device by an elevating mechanism 13 or a reciprocating mechanism 14 to polish a cutting edge 17 . do.

FIG. 2 shows the principle of measuring the blade width in the example. The rotating mechanism 12 of FIG. 1 rotates the blade 16 about the center of rotation 24 . A dashed line 25 indicates a laser beam (detection line) from the laser light source 18 to the light receiving element 20 . A state in which the direction of the blade 16 is perpendicular to the laser beam 25 is the reference state. When the blade 16 is rotated about the rotation center 24 toward the light receiving element 20 or toward the laser light source 18, the laser beam reaches the light receiving element 20 at a certain rotation angle θ from the reference state. . This angle θ is measured by the light receiving element 20 .

When the distance r from the rotation center 24 to the cutting edge 17 is r1, for example, the laser beam reaches at the rotation angle θ1. When the cutting edge retreats to 17' and the distance between the center of rotation 24 and the cutting edge 17' is r2, the laser beam reaches at the rotation angle θ2. Note that h is the distance from the laser beam 25 to the center of rotation 24 . in any case,
r・COSθ=h1)
, the distance (cutting edge width) from the rotation center 24 to the cutting edge 17, 17' can be measured. Since the laser beam is narrow, the blade width can be measured in one measurement. Of course, the angle at which the blade 16 changes from the state without the blade 16 to the state with the blade may be measured.

As shown in FIG. 3, a camera 30 can be used instead of the laser light source 18 and the light receiving element 20. FIG. It is observed whether the blade 16 is captured in a predetermined pixel of the camera 30. - 特許庁Let h be the distance between the detection line from the camera 30 and the center of rotation 24 . Suppose that the blade 16 is rotated so that the blade 16 no longer appears in a predetermined pixel at the rotation angle θ. At this time, the distance r from the rotation center 24 to the cutting edge 17, 17' satisfies the formula 1). Moreover, by using the camera 30, the width of the blade can be measured at a plurality of points at once.
r・COSθ=h1)

FIG. 4 shows the edge width measurement algorithm of the embodiment. For the straight blade 16, the blade width is measured every few minutes. For example, when the blade 16 is used for a predetermined time, the controller 6 needs to measure the width of the blade (step S1). Since the blade width is measured frequently, the blade width is measured while the cutting head 10 is idle for the next cut and the blade edge is rotating so that the blade width measurement does not delay the cut ( step S2). Alternatively, when the cutting head 10 is idling (when there is no process being executed) for exchanging the sheet material, etc., the cutting edge is rotated to measure the cutting edge width (step S2).

The rotating mechanism 12 rotates the blade 16 toward the target angle at high speed (step S3). Here, the target angle is an expected angle for detecting the position of the cutting edge 17 . At the same time, the blade 16 is lifted by the lifting mechanism 13 or the reciprocating mechanism 14 so that the cutting edge 17 at the height used for cutting comes to the position monitored by the laser beam. The target angle is determined based on, for example, the angle at the time of the previous measurement stored in the memory.

Next, the blade 16 is rotated at a low speed, and the angle at which the laser beam changes from off to on as viewed from the light receiving element 20 is measured (step S4). The blade 16 may now also be rotated in the opposite direction, the angle at which the laser beam transitions from on to off may be measured, and the average angle of the two angles may be used. After measuring the blade width, the direction of the blade is rotated at high speed.

When checking whether the blade width is uniform along the height direction (step S5), the blade is moved up and down near the target angle, and after changing the height, the blade is rotated at a low speed, and the blade is rotated at a plurality of heights. The width is measured (steps S6, S7). In this measurement, the blade 16 is moved up and down with a large stroke, so both the lifting mechanism 13 and the reciprocating mechanism 14 may be used, or only the lifting mechanism 13 may be used.

It is also possible to fix the orientation of the blade tip at an angle slightly smaller than the angle measured in step S4, move the blade up and down, and observe whether there is a height at which the laser beam is turned on when viewed from the light receiving element 20. In this case, the direction of the blade edge is fixed at an angle slightly larger than the angle measured in step S4, the blade is moved up and down again, and it is observed whether there is a height at which the laser beam is turned off when viewed from the light receiving element 20. Then, it is possible to observe whether the distribution of the cutting edge positions is within the allowable range, and if it is outside the allowable range, the height can be measured.

Although the straight blade 16 is shown in the embodiment, the blade width of the circular blade 40 shown in FIG. 5 may be measured. 41 is a circular cutting edge, and 42 is a rotating shaft of the blade 40 . The blade 40 and the rotating shaft 42 are rotated around the rotation center 24, and the distance r from the center of the blade 40 (the center of the rotating shaft 42) to the cutting edge 41 is measured. Assuming that the distance from the center of the rotating shaft 42 to the laser beam 25 is h, and the angle at which the laser beam 25 is turned on as viewed from the light receiving element 20 is θ, the distance r representing the blade width is given by Equation 1).
r・COSθ=h1)

FIG. 6 shows the measurement algorithm for round blades. The laser beam is arranged at the same height as the axis of rotation 42, for example. In step S11, it is confirmed whether it is necessary to measure the width of the blade. When measuring the width of the blade, when the rotary shaft 42 is being rotated while idle, or when the cutting head 10 is idling (no processing is being executed). At this time, the blade width is measured by rotating the direction of the round blade (step S12).

The direction of the rotating shaft 42 is rotated at high speed before the target angle (step S13), and then the direction of the rotating shaft 42 is rotated at low speed so as to pass the target angle (step S14). At this time, the angle .theta. at which the laser beam changes from OFF to ON as viewed from the light receiving element 20 is obtained, and the blade width is measured according to the formula (1).

Steps S15 and S16 are executed when checking whether the position of the cutting edge 41 is uniform along the circumferential direction, and steps S15 and S16 are omitted if checking is unnecessary. The orientation of the rotating shaft 42 is fixed at angles slightly larger and smaller than the angle θ, and the blades 40 are each rotated once. If the position of the cutting edge 41 is uniform, the on/off state of the laser beam does not change during one rotation. If the position of the cutting edge 41 changes beyond the allowable range, the laser beam turns on/off during one rotation.

In the embodiment, it is rotated at high speed until it reaches the target angle, but it does not have to be rotated at high speed.

2 Cutting Machine 4 Moving Mechanism 6 Controller 10 Cutting Head 12 Rotating Mechanism 13 Elevating Mechanism 14 Reciprocating Mechanism 16 Blade 17 Cutting Edge 18 Laser Light Source 20 Light Receiving Element 22 Polishing Device 24 Rotation Center 30 Camera 40 Round Blade 41 Cutting Edge

Claims (5)

A cutting head having a cutting blade, an elevating mechanism for the blade, and a rotating mechanism for rotating the orientation of the blade, and a moving mechanism for relatively moving the cutting head and the object to be cut in the two directions of XY. , a controller that controls the cutting head and the moving mechanism, and
The cutting head comprises detection means for optically detecting the presence or absence of the blade on a detection line passing through a predetermined position in the cutting head,
When the direction of the blade is rotated by the rotating mechanism, the blade width of the blade is calculated from the rotation angle θ of the blade when the detection means detects a change in the presence or absence of the blade on the detection line. A cutting machine, characterized in that it is configured as follows. 2. The detecting means comprises a laser light source attached to the cutting head on one side of the blade and a light receiving element attached to the cutting head on the other side of the blade. cutting machine. When the detection means detects once the change from the state with the blade to the state without the blade or the change from the state without the blade to the state with the blade, the blade width of the blade is calculated from the rotation angle of the blade at that time. 3. Cutting machine according to claim 1 or 2, characterized in that it is arranged to The blade is a straight sword with a straight cutting edge,
Further, by elevating and lowering the blade by the elevating mechanism and rotating the direction of the blade at a plurality of heights and measuring the width of the blade at a plurality of heights, partial wear of the blade is also detected. The cutting machine according to any one of claims 1 to 3, characterized in that it is constructed as follows. A cutting head having a cutting blade, an elevating mechanism for the blade, and a rotating mechanism for rotating the direction of the blade, a moving mechanism for moving the cutting head or an object to be cut in two directions of XY, and a cutting head and a controller that controls the movement mechanism, and
The cutting head is provided with detection means for optically detecting the presence or absence of the blade on a detection line passing through a predetermined position in the cutting head,
Rotating the direction of the blade by the rotation mechanism and calculating the blade width of the blade from the rotation angle of the blade when the detection means detects that the presence or absence of the blade has changed on the detection line. A method for measuring the blade width of a cutting machine, characterized by:

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