JP6249710B2 - Cutting machine and cutting head lifting control method - Google Patents

Description

  The present invention is provided with a cutting blade and a foot press in the cutting head, and when the sheet-like cloth is cut, a cutting machine that raises and lowers the cutting head so that the foot press presses the surface of the cloth around the cutting blade, The present invention also relates to a cutting head lifting control method for a cutting machine.

  2. Description of the Related Art Conventionally, a cutting machine has been used for cutting a sheet-like fabric or the like according to preset cutting data (see, for example, Patent Document 1). This cutting machine includes a cutting table on which a sheet-like material to be cut is placed, and a cutter head as a cutting head that can move on the cutting table. The cutter head is provided with a press plate as a foot press that faces the cutting table and presses the surface of the sheet-like material around the knife, as well as a mechanism that pushes the knife into the sheet-like material and reciprocates up and down. Yes. The press disc can be displaced with respect to the cutter head within the range of the lifting stroke set in advance from the used parts and structure. At the raised position of the cutter head, the pressing plate is suspended via a spring at the lower limit of the lifting stroke range, and the bottom surface of the pressing plate is separated upward from the surface of the sheet-like material. When the cutter head is lowered, the bottom surface of the pressing plate comes into contact with the surface of the sheet material. When the cutter head is further lowered, the pressing plate can be displaced from the lower limit to the upper limit of the lifting stroke range, the pressing plate approaches the cutter head, the spring is compressed, and the pressing plate is attached downward. As a result, the bottom surface of the pressing plate presses the surface of the sheet-like material.

  When cutting the sheet-like material with a knife, it is performed while pressing the area around the knife on the surface of the sheet-like material with a pressing plate. This prevents the knife from reciprocating up and down to lift the sheet-like material, especially when it is raised, and stable cutting can be performed.

Japanese Examined Patent Publication No. 4-33595

  In order to increase the cutting efficiency, the sheet-like material may be cut in a state where a plurality of sheets are laminated. In the case of laminating and cutting soft sheet-like materials, the thickness of the sheet-like material placed on the cutting table tends to fluctuate. The pressing plate that presses the surface of the sheet-like material can suppress the variation in the thickness of the sheet-like material if the pressing force is large, but only the portion pressed by the pressing plate is compressed. Since the peripheral portion that is not pressed by the pressing plate is not compressed, the cutting is performed in a state where the sheet-like material is partially deformed, and the cutting position may be shifted after the pressing is released.

  If the pressing force of the pressing plate is small, the surface of the sheet-like material may be lifted when the knife is raised, and the cutting position may be shifted. For this reason, the press disc needs to press the surface of the sheet material with an appropriate pressing force according to the characteristics of the sheet material. Moreover, even if the thickness of the sheet-like material varies in such a pressed state, it is desirable that the position of the pressing plate can follow the variation.

  The lift stroke range in which such a pressing plate can follow the fluctuation of the surface of the sheet-like material is determined according to the configuration of the mechanism that supports the pressing plate and presses against the surface of the sheet-like material. If the range can be widened, it is easy to apply an appropriate pressing force from the pressing plate to the surface of the sheet-like material in response to the fluctuation of the surface of the sheet-like material. However, the mechanism capable of widening the lifting stroke range in which the pressing plate is pressed against the surface of the sheet material with an appropriate pressing force is increased in size. In addition, the amount of ascent for raising the cutter head to lift the pressing plate from the surface of the sheet-like material is increased, and the cutting efficiency is lowered.

  The object of the present invention is to cope with fluctuations exceeding the lifting stroke range even if the lifting stroke range in which the foot presser pressing the sheet-like material around the cutting blade can follow the height change of the surface is reduced. It is providing the cutting machine which can be obtained and pressed, and the cutting head raising / lowering control method.

The present invention comprises a table for placing a sheet material material to be cut;
A cutting head having a cutting blade for cutting the cloth, movable in two dimensions in the X-axis direction and the Y-axis direction along the surface of the table, and capable of moving up and down in the Z-axis direction perpendicular to the surface of the table;
A foot press provided on the cutting head so as to face the table and capable of displacement in the Z-axis direction at a position within a range of a lifting stroke set in advance with respect to the cutting head;
In a cutting machine having
A pressing means for bringing the foot press into contact with the surface of the fabric and pressing the fabric with a preset pressing force;
A displacement amount detecting means for detecting a displacement amount of the foot press with respect to the cutting head in accordance with a surface variation of the fabric at the time of cutting based on a preset reference position ;
A displacement determination unit that monitors the amount of displacement detected by the displacement amount detection unit and determines the presence or absence of displacement based on a predetermined determination criterion;
If the amount of displacement deviates from the determination reference according to the determination result of the displacement determination means while cutting the fabric, the position of the foot presser with respect to the cutting head becomes the reference position set next within the lifting stroke range. Elevating control means for controlling the cutting head to elevate,
It is a cutting machine characterized by including.

In the present invention, the displacement determination means may be
Monitoring the amount of displacement at a preset timing;
It is characterized by that.

In the present invention, the displacement determination means may be
When the displacement amount exceeds a predetermined determination range, it is determined that there is a displacement,
It is characterized by that.

In the present invention, the pressing means is
An air cylinder having two air input ports and pressing the foot presser with an output of a piston driven based on a differential pressure between the ports;
An electropneumatic regulator that supplies air at a set pressure that is electrically controllable to at least one port of the air cylinder;
It is characterized by including.

Furthermore, the present invention places the sheet-like material to be cut on the table,
A cutting head having a cutting blade for cutting the cloth can be moved in two dimensions in the X-axis direction and the Y-axis direction along the surface of the table, and can be moved up and down in the Z-axis direction perpendicular to the surface of the table.
On the side facing the table, the cutting head is provided with a foot press capable of displacement in the Z-axis direction at a position within the range of the lifting stroke set in advance with respect to the cutting head.
In the cutting head lifting control method of the cutting machine,
While cutting the dough,
The foot presser is brought into contact with the surface of the fabric, and the fabric is pressed with a preset pressing force,
The amount of displacement of the foot press with respect to the cutting head accompanying the surface fluctuation of the fabric during cutting is detected based on a preset reference position ,
Monitor the amount of displacement to be detected, determine the presence or absence of displacement based on a predetermined criterion,
Depending on the determination result, when the displacement amount deviates from the determination reference , control is performed so that the cutting head is raised and lowered so that the position of the foot presser with respect to the cutting head becomes the reference position set next within the lifting stroke range. ,
This is a cutting head lifting control method for a cutting machine.

According to the present invention, the foot presser that presses the surface of the dough when the dough of the sheet-like material placed on the table is cut is displaced along with the surface fluctuation of the dough. Displacement amount detecting means detects the displacement of the amount of the foot presser for cutting head. The displacement determination means monitors the amount of displacement and determines the presence or absence of displacement based on a predetermined criterion. In accordance with the determination result by the displacement determination means, the elevation control means controls the position of the foot presser with respect to the cutting head to be a preset reference position within the range of the elevation stroke. Even if the foot presser that presses the sheet-shaped fabric around the cutting blade reduces the range of the lifting stroke that can follow the height change of the fabric surface, if the displacement amount is monitored and it is determined that there is displacement, Since the cutting head is moved up and down, it is possible to cope with fluctuations exceeding the range of the up and down stroke that can be followed, and the fabric can be pressed by the foot presser. The inversion mechanism, since a combination of the crank member and the arm member can be made compact by reducing the number of parts can be reduced in cost by saving space.

  Further, according to the present invention, since the displacement determination means monitors the displacement amount at a preset timing, small cycle fluctuations can be absorbed by the foot presser pressing means, and the frequency of raising and lowering the cutting head can be reduced. it can.

  Further, according to the present invention, the displacement determination means determines that there is displacement when the displacement amount exceeds a predetermined determination range. Therefore, only when a large displacement occurs, the displacement head moves up and down, and the foot presser with respect to the cutting head moves. The position can be controlled appropriately.

  According to the present invention, the foot presser is pressed by the output of the air cylinder, and at least one port of the air cylinder is supplied with air at a set pressure that can be electrically controlled from the electropneumatic regulator. The pressing force of the foot presser can be set in a range smaller than that due to the weight of the foot presser, and it is possible to cut while appropriately pressing the soft material.

Further according to the present invention, when cutting the dough sheet material is placed on the table, monitoring the displacement of weight relative to the cutting head which is displaced in accordance with the surface variations of the fabric of the foot presser for pressing the surface of the fabric Then, the presence or absence of displacement is determined based on a predetermined criterion. In accordance with the determination result, the cutting head is controlled to move up and down so that the position of the foot presser relative to the cutting head becomes a reference position set in advance within the range of the lifting stroke. Even if the lift stroke range that the foot press can follow the height change of the fabric surface is reduced, fluctuations exceeding the followable lift stroke range can be handled by raising and lowering the cutting head. It becomes possible to press appropriately.

FIG. 1 is a diagram showing a schematic configuration of a cutting machine 1 as an embodiment of the present invention. FIG. 2 is a piping system diagram showing the configuration of the pressing means 20 of FIG. FIG. 3 is a diagram showing a basic concept of control for raising and lowering the cutting head 2 in FIG. FIG. 4 is a view showing an operation of lowering the cutting head 2 in FIG. 1 and pressing the surface of the fabric 4 with the foot presser 8. FIG. 5 is a flowchart showing the concept of performing the lifting control of the foot presser 8 with the cutting machine 1 of FIG.

  An embodiment of the present invention will be described below with reference to FIGS. In the description of each figure, the reference numerals that do not exist in the drawing but are described in the drawings described above are used, or the parts that correspond to the parts shown in the drawings described above are the same. May be added, or duplicate descriptions may be omitted.

  FIG. 1 shows a schematic configuration of a main part of a cutting machine 1, particularly a cutting head 2, as an embodiment of the present invention. The basic configuration of the cutting machine 1 and the cutting head 2 is equivalent to the configuration described in Patent Document 1. That is, the cutting head 2 is supported by a base portion that moves two-dimensionally in the X-axis direction and the Y-axis direction along the surface of the horizontal table 3 and moves up and down in the Z-axis direction perpendicular to the surface of the table 3. The sheet-like material 4 placed on the table 3 is cut. The table 3 includes bristle brushes 3a made of a rigid resin and is formed of bristles standing upright from below, has a breathable surface, and can hold the fabric 4 by sucking from below the bristle brush 3a. The cloth 4 is laminated by one sheet or plural sheets, and the surface is covered with a non-breathable synthetic resin film.

  The cutting head 2 of this embodiment is provided with a knife-like cutting blade 5 as a cutting blade. The cutting blade 5 has a cutting edge 5 a that protrudes downward, and cuts by applying the side edge 5 b to the fabric 4. In order to move the cutting blade 5 up and down, a Z-axis lifting mechanism 6 is provided. Control on the Z-axis lifting mechanism 6 is performed by the control unit 7. The control unit 7 is provided to perform overall control of the cutting machine 1 including movement of the cutting head 2 in the X-axis direction, the Y-axis direction, and the Z-axis direction. The surface of the cloth 4 on which the cutting blade 5 cuts can be pressed by a foot presser 8 provided on the cutting head 2 so as to face the cloth 4. The direction of the blade edge 5 b of the cutting blade 5 can be changed around the axis perpendicular to the surface of the table 3 by the R-axis unit 9.

  The Z-axis lifting mechanism 6 includes a ball screw mechanism that is driven by a lift motor 10. The ball screw mechanism is provided with a pulley 11, a timing belt 12, a pulley 13, and a screw rod 14. The pulley 11 is attached to the output shaft of the lift motor 10, and the pulley 13 is attached to the screw rod 14. The timing belt 12 is stretched between the pulleys 11 and 13. The screw rod 14 is rotatably supported by the frames 15 and 16 of the cutting head 2 at the top and bottom. The frames 15 and 16 are included in a base portion that supports the cutting head 2. In the cutting head 2, the base portion moves along the surface of the table 3 in two dimensions in the X-axis direction and the Y-axis direction. The lift motor 10 is also attached to the base portion. A nut member 17 is screwed onto the screw rod 14, and the nut member 17 moves up and down as the screw rod 14 rotates.

  The cutting head 2 is supported by a nut member 17 and moves up and down in the Z-axis direction with respect to the frames 15 and 16. A Z-axis cylinder 18 is attached to the nut member 17, and the Z-axis cylinder 18 moves the reciprocating mechanism 19 up and down with respect to the ball screw mechanism in the Z-axis direction. The reciprocating mechanism 19 is provided for reciprocating up and down the cutting blade 5 within a range of a mechanically set vibration stroke.

  A pressing means 20 is also attached to the nut member 17. The pressing means 20 is used to switch between an operating state in which the fabric 4 is pressed against the foot presser 8 and an inactive state in which the fabric 4 is separated from the surface. The elevation of the reciprocating mechanism 19 in the Z-axis direction is guided by a lift guide shaft 21 whose upper and lower ends are supported by the frame of the cutting head 2. A guide shaft 22 extends downward from the R-axis unit 9. The foot presser 8 is guided by the guide shaft 22 and is urged to be lifted upward by a spring 23 provided on the upper portion of the guide shaft 22. The position of the spring 23 can be slightly adjusted with the adjusting screw 23a.

  The pressing means 20 includes an air cylinder 24 as an actuator. The output rod 24a of the air cylinder 24 protrudes downward, and a connection unit 25 is attached to the tip. The connection unit 25 lowers the foot presser 8 against the bias of the spring 23 when the air cylinder 24 is operated so as to project the output rod 24a. In a state in which the air cylinder 24 is activated, the foot presser 8 is in a state of pressing the surface of the fabric 4 and is in a state of floating from the surface of the table 3 by the thickness of the fabric 4. The range of the stroke in which the output rod 24a of the air cylinder 24 operates is preset mechanically. When the surface of the fabric 4 is pressed by the foot presser 8 as the pressing means 20, the range of the lift stroke in which the foot presser 8 moves up and down relative to the cutting head 2 is the stroke range of the air cylinder 24. However, even within the stroke range of the air cylinder 24, for example, when the guide shaft 22 is provided with a stopper, the range of the lift stroke is limited.

  When the height of the foot presser 8 changes in accordance with the thickness of the fabric 4, the position of the foot presser 8 with respect to the cutting head 2 is displaced and meshes with the rack 26 provided above the connection unit 25 and the teeth of the rack 26. The displacement amount is detected by the encoder 28 via the pinion 27.

  The R-axis motor 29 includes a pulley 30 on the output shaft. A timing belt 31 is hung on the pulley 30, and the timing belt 31 is hung on a pulley 32 of the R-axis unit 9. The output of the R-axis motor 29 rotates the R-axis unit 9.

  The control unit 7 includes a displacement determination unit 33 and a lift control unit 34. The displacement determination means 33 monitors the displacement amount detected by the encoder 28 as the displacement amount detection means, and determines the presence or absence of displacement based on a predetermined criterion. The lift control means 34 sets the position of the foot presser 8 with respect to the cutting head 2 according to the determination result of the displacement determination means 33 so that it becomes a reference position set in advance within the lift stroke range. The cutting head 2 is raised and lowered with a new position in the Z-axis direction as a target.

  After the position of the foot presser 8 with respect to the cutting head 2 becomes the reference position, the foot presser 8 that presses the sheet-like cloth 4 around the cutting blade 5 is within the range allowed by the lifting stroke, and is on the surface of the cloth 4. It becomes possible to follow the height change. When the change in the height of the surface of the fabric 4 increases, the amount of displacement of the foot presser 8 relative to the cutting head 2 from the reference position also increases. If this displacement amount is monitored and it is determined that the displacement amount exceeds the determination range, a new Z-axis direction position where the position of the foot presser 8 relative to the cutting head 2 becomes the reference position is set as a target, and the cutting head 2 is Move up and down. By repeating the resetting of the reference position as described above, the pressing of the foot presser 8 by the pressing means 20 can cope with the height fluctuation of the surface of the fabric 4 exceeding the range of the up and down stroke that can be followed. It becomes possible to press the surface appropriately.

  FIG. 2 shows the configuration of the pressing means 20 of FIG. The pressing means 20 has two air input ports as an actuator, and an air cylinder 24 that raises and lowers the foot presser 8 by an output of a piston driven based on a differential pressure between the ports, and at least one of the air cylinders 24 And an electropneumatic regulator 35 for supplying air at a set pressure which is electrically controllable to the port. In this embodiment, an electropneumatic regulator 35 is provided at a port for pressing the internal piston downward by the air cylinder 24, a precision regulator 36 is provided at a port for pressing the piston upward, a pressure control line 37 and a constant pressure line 38 are provided. To connect to each other. Compressed air is supplied to the electropneumatic regulator 35 and the precision regulator 36 through the flexible air supply line 39 from the outside of the cutting head 2, for example, from below the table 3.

  The precision regulator 36 supplies a constant pressure of air to the other port of the air cylinder 24. If the set pressure of the electropneumatic regulator 35 is changed with respect to the set pressure of the precision regulator 36, the pressing force of the foot presser 8 by the air cylinder 24 can be adjusted. The pressing force of the foot presser 8 can be set in a range smaller than that due to the weight of the foot presser 8, and the soft material 4 can be cut while being appropriately pressed.

  As the pressing means 20, an electropneumatic regulator can be used instead of the precision regulator 36. If an electropneumatic regulator is used for both the upper and lower sides, the pressing force of the foot presser 8 can be set more finely. If the necessary pressing force is greater than the weight of the foot presser 8, the two ports of the air cylinder 24 are switched, one of them is opened to atmospheric pressure, and the other is supplied with compressed air at a pressure higher than atmospheric pressure. You may make it supply.

  Further, as the pressing means 20, instead of the air cylinder 24, another actuator such as a hydraulic pressure or a linear motor is used to control the driving force corresponding to the pressing force so as to keep the pressing force constant. May be. Further, without using the actuator, the compression force of the spring 23 may be used, or the pressing force may be applied by the weight of the foot presser 8 or an additional load.

  In any case, the pressing means 20 is limited in the range of the lifting stroke in which the foot presser 8 can apply an appropriate range of pressing force to the surface of the fabric 4. If this range is widened, the apparatus becomes large. In the present embodiment, the cutting head 2 is controlled to move up and down based on the following concept, so that an appropriate pressing force is applied even if the height of the surface of the fabric 4 varies.

  FIG. 3 shows a basic concept of control for raising and lowering the cutting head 2 in FIG. When the height of the surface of the fabric 4 varies by ΔH in the state shown in FIG. 3A and the state shown in FIG. 3B, the cutting head 2 is raised and lowered by ΔD, and the foot presser 8 for the cutting head 2 is moved. Is controlled to be a preset distance. Although the encoder 28 constantly changes following ΔH, the displacement determination means 33 is intermittently set at a preset timing, for example, every fixed period such as 5 to 30 ms, preferably 10 ms, or every part cutting. The raising / lowering control means 34 controls raising / lowering of the cutting head 2 according to the monitoring result.

  FIG. 4 shows the operation of lowering the cutting head 2 in FIG. 1 and pressing the surface of the fabric 4 with the foot presser 8. In a state where the cutting head 2 is raised above the table 3, the lifting stroke of the foot presser 8 that can be performed by the pressing means 20 is from the upper limit shown in FIG. 4 (a) to the lower limit shown in FIG. 4 (b). The range is Smax. Smax can be set to 30 mm, for example. When performing cutting, the lifting control means 34 controls the Z-axis lifting mechanism 6, and the cutting head 2 is lowered until the bottom surface of the foot presser 8 comes into contact with the surface of the fabric 4 as shown in FIG. Let When contacted, the output of the encoder 28 starts to change, and can be detected. The lifting control means 34 further controls the Z-axis lifting mechanism 6 to lower the position of the foot presser 8 relative to the cutting head 2 to a reference position set in advance in the lifting stroke.

  The reference position is preferably set so as to correspond to the vicinity of the middle of the lifting stroke of the foot presser 8. For example, when Smax is 30 mm, if the reference position is set in the middle, ± 10 mm is allowed as the displacement of the position of the foot presser 8. In this way, if the reference position is set near the middle within the range of the lifting stroke, a margin can be taken in any direction above and below the unevenness of the fabric 4.

  Note that, as the next reference position that is set when the displacement amount exceeds the allowable range, a position that is half the allowable range from the position that exceeds the allowable range is not necessarily set. For example, when the upper limit of +10 mm is exceeded or the lower limit of −10 mm is exceeded, the absolute value is not 10 mm from each position, but within the Smax range, a position separated by a distance greater than 10 mm is The reference position may be set. For example, when the height of the fabric 4 is continuously increased, the cutting head 2 is positioned higher in advance, and the stroke until the displacement reaches the upper limit can be increased.

  FIG. 5 shows the overall concept of controlling the elevation of the foot presser 8 by the control unit 7 of the cutting machine 1 of FIG. 1 when cutting one part from the fabric 4. The control unit 7 performs control including the displacement determination unit 33 and the elevation control unit 34 according to a preset program. The cutting head 2 starts control from a state where it is raised above the table 3 as shown in FIGS. 4 (a) and 4 (b).

  After starting the control, in step s1, the pressing force from the foot presser 8 to the fabric 4 by the air cylinder 24 is set. This setting is performed by setting a differential pressure from the constant pressure by the precision regulator 36 to the electropneumatic regulator 35. In step s2, the cutting head 2 is lowered. In step s3, it is determined whether or not the foot presser 8 is in contact with the surface of the fabric 4 as shown in FIG. The lowering is continued until it comes into contact, and if it is determined that the foot presser 8 has come into contact with the surface of the fabric 4, the cutting head 2 is lowered to the reference position shown in FIG. At the reference position, the displacement amount detected by the encoder 28 is initialized to zero.

  After step s5, the cutting blade 5 is moved down by operating the Z-axis cylinder 18 and pierced into the cloth 4 from the blade edge 5a, and the cutting blade 5 is moved up and down by the reciprocating mechanism 19 while the cutting head 2 is moved back and forth. Cut along the surface. Cutting is performed according to preset cutting data. When it is determined in step s6 that cutting of one part has been completed from the cutting data, the cutting ends. If it is determined in step s6 that cutting is not completed, in step s7, the displacement determination means 33 monitors the displacement amount from the reference position detected by the encoder 28, and in step s8, the displacement amount is outside the determination range. It is determined whether or not. This determination is performed intermittently as described above. As described above, when a displacement of ± 10 mm is allowed, this 10 mm is the determination range. If it is determined that the displacement amount is within the determination range, the process returns to step s5 and cutting is continued. If it is determined that the amount of displacement is outside the determination range, in step s9, the lifting control means 34 controls the Z-axis lifting mechanism 6 so that the position of the foot presser 8 with respect to the cutting head 2 becomes the reference position, and the cutting head 2 Is moved up and down, and the process returns to step s5 to continue cutting.

  When cutting a plurality of parts continuously, the cutting head 2 may not be raised from the fabric 4 in some cases. In such a case, the control of raising and lowering the cutting head 2 from the monitoring of the displacement amount in step s7 to the reference position in step s9 may be performed for each part.

DESCRIPTION OF SYMBOLS 1 Cutting machine 2 Cutting head 3 Table 4 Material 5 Cutting blade 6 Z axis raising / lowering mechanism 7 Control part 8 Foot presser 20 Pressing means 23 Spring 24 Air cylinder 28 Encoder 33 Displacement judgment means 34 Lifting control means 35 Electropneumatic regulator

Claims (5)

A table for placing a sheet-like material to be cut;
A cutting head having a cutting blade for cutting the cloth, movable in two dimensions in the X-axis direction and the Y-axis direction along the surface of the table, and capable of moving up and down in the Z-axis direction perpendicular to the surface of the table;
A foot press provided on the cutting head so as to face the table and capable of displacement in the Z-axis direction at a position within a range of a lifting stroke set in advance with respect to the cutting head;
In a cutting machine having
A pressing means for bringing the foot press into contact with the surface of the fabric and pressing the fabric with a preset pressing force;
A displacement amount detecting means for detecting a displacement amount of the foot press with respect to the cutting head in accordance with a surface variation of the fabric at the time of cutting based on a preset reference position ;
A displacement determination unit that monitors the amount of displacement detected by the displacement amount detection unit and determines the presence or absence of displacement based on a predetermined determination criterion;
If the amount of displacement deviates from the determination reference according to the determination result of the displacement determination means while cutting the fabric, the position of the foot presser with respect to the cutting head becomes the reference position set next within the lifting stroke range. Elevating control means for controlling the cutting head to elevate,
Cutting machine characterized by including. The displacement determination means includes
Monitoring the amount of displacement at a preset timing;
The cutting machine according to claim 1, wherein: The displacement determination means includes
When the displacement amount exceeds a predetermined determination range, it is determined that there is a displacement,
The cutting machine according to claim 1 or 2, characterized in that The pressing means is
An air cylinder having two air input ports and pressing the foot presser with an output of a piston driven based on a differential pressure between the ports;
An electropneumatic regulator that supplies air at a set pressure that is electrically controllable to at least one port of the air cylinder;
The cutting machine according to any one of claims 1 to 3, comprising: Place the sheet-like material to be cut on the table,
A cutting head having a cutting blade for cutting the cloth can be moved in two dimensions in the X-axis direction and the Y-axis direction along the surface of the table, and can be moved up and down in the Z-axis direction perpendicular to the surface of the table.
On the side facing the table, the cutting head is provided with a foot press capable of displacement in the Z-axis direction at a position within the range of the lifting stroke set in advance with respect to the cutting head.
In the cutting head lifting control method of the cutting machine,
While cutting the dough,
The foot presser is brought into contact with the surface of the fabric, and the fabric is pressed with a preset pressing force,
The amount of displacement of the foot press with respect to the cutting head accompanying the surface fluctuation of the fabric during cutting is detected based on a preset reference position ,
Monitor the amount of displacement to be detected, determine the presence or absence of displacement based on a predetermined criterion,
Depending on the determination result, when the displacement amount deviates from the determination reference , control is performed so that the cutting head is raised and lowered so that the position of the foot presser with respect to the cutting head becomes the reference position set next within the lifting stroke range. ,
A cutting head lifting and lowering control method for a cutting machine.

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