JPH0557682A - Cutting device control method and cutting device used in this method - Google Patents

Abstract

PURPOSE:To provide a cutting method and a device therefor enabling cutting with optimum cutting capacity by adjusting cutting speed control data in correspondence with various factors appearing in cutting resistance from the viewpoint that every cutting resistance during cutting appears as the resistance to the reciprocating motion of a blade. CONSTITUTION:A cutting device is provided with a cutting means 5 for cutting at least one piece of sheet material with a blade reciprocated vibratingly, and moving means 31, 41 for moving the blade and sheet material relatively at the same time. In this cutting device, there are further provided a vibration frequency setting means 81 for setting the set vibration frequency of the blade, a vibration frequency detecting means 9 for detecting the actual vibration frequency of reciprocating vibration of the blade, a comparing means 83 for outputting a deceleration command when the actual vibration frequency becomes lower than the set vibration frequency and outputting an acceleration command when the actual vibration frequency becomes more than the set vibration frequency, and a cutting speed control means 84 for performing the increase/decrease control of the relative moving speed between the blade and sheet material according to a deceleration/acceleration command.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cutting a sheet material such as cloth.

[0002]

2. Description of the Related Art In order to cut a flexible sheet material such as cloth into a predetermined shape, an automatically controlled cutting device is used. This cutting device cuts a stack of a large number of the above sheet materials stacked on a cutting table by cutting the stack with a blade that reciprocates up and down, while relatively moving the stack and the blade. Many are configured to proceed.

At this time, the blade is reciprocally driven in the vertical direction by the blade driving means, and the head having the blade is moved in parallel in the X-axis and Y-axis directions on the surface of the cutting table. Is equipped with. Further, in order to match the direction of the blade with the moving direction of the head, there is also provided rotating means for rotating the blade around an axis perpendicular to the cutting table.

The relative moving speed of the blade and the stack is controlled by the parallel moving means,
Such cutting operation is substantially fixed by a predetermined program or the like. For example, when the cutting shape is complicated, cutting is performed while changing the direction of the blade by the rotating means. Therefore, the moving speed is reduced by cutting speed control data that controls the cutting speed together with the cutting shape data. Is being carried out.

These cutting speed control data are data based on cutting conditions that can be known in advance, such as the cutting shape, the thickness of the stack and the material of the sheet material.
Therefore, it is not possible to deal with various changes in the cutting conditions that occur during the cutting operation. Such changes in conditions include a reduction in cutting ability due to blade wear and changes in humidity of the atmosphere. Such changes in cutting conditions are automatically detected and cutting control data is adjusted in real time. If it is possible, it is possible to perform cutting control by a higher degree of automatic control.

[0006] It is not realistic to detect the wear state humidity of the blades individually, even if it is technically possible. The reason is that if there are changes in conditions other than wear and humidity, it becomes impossible to deal with them immediately. Therefore, paying attention to the fact that changes in various cutting conditions appear as resistance to cutting of the blade, and if such cutting resistance can be detected, it is possible to know in advance without monitoring wear and humidity. Data such as the cut shape, the thickness of the stack, the material of the sheet material, and the like can be eliminated. That is, it is possible to perform the optimum operation of cutting with the optimum cutting ability for the cutting resistance during cutting.

That is, when the cutting ability of the blade per unit number of vibrations is lower than the cutting resistance, the frequency is reduced, and when the cutting resistance is exceeded, the frequency is increased. Driving in a state where the cutting ability exceeds the cutting resistance causes problems such as increased noise and unnecessary energy consumption. For this reason as well, it is desired to detect a change in cutting resistance and perform optimum control.

As one means for that purpose, for example, in Japanese Patent Publication No. 55-45357, a lateral load on the blade, which is one element of cutting resistance, is detected by a load sensor or the like, and based on this, cutting speed control data. An apparatus and method for adjusting the is shown.

[0009]

However, since the apparatus and method described above can detect only the change in the lateral load on the blade, which is one element of the cutting resistance, the load should be detected in at least two directions. If two sets of load sensors are not provided, it is not possible to cope with an unexpected change in cutting resistance when cutting in a curved shape or in a straight shape.

In any case, only by detecting the lateral load, it is not possible to deal with a change in the cutting resistance in the vertical direction with respect to the blade, for example, an accident such as breakage of the blade. Therefore, the present invention is
Focusing on the fact that all cutting resistance during cutting appears in resistance to reciprocal movement of the blade, adjust cutting speed control data according to various factors that appear in cutting resistance, and cut with optimum cutting ability. The purpose of the present invention is to provide a cutting method and device capable of cutting.

[0011]

In the control method of the cutting device according to the present invention, at least one sheet material S is used.
The cutting means 5 for cutting with a blade that reciprocally vibrates, and the cutting device control method including the moving means 31 and 41 for relatively moving the blade 5 and the sheet material S. When the actual frequency of vibration is detected and the actual frequency is lower than a predetermined set frequency, the relative moving speed between the blade and the sheet material is reduced, and the actual frequency is set to the predetermined set frequency. When the number is further increased, the relative movement speed between the blade and the sheet material is controlled to be increased.

In the cutting device according to the present invention, a cutting means 5 for cutting at least one sheet material S by a reciprocating vibrating blade is provided, and the blade and the sheet material are relatively moved. Means of transportation 31,4
In the cutting device provided with 1, the frequency setting means 81 for setting the set frequency of the blade, the frequency detecting means 9 for detecting the actual frequency of reciprocating vibration of the blade, and the actual frequency are set as described above. When the frequency is lower than the frequency, a deceleration command is output, and when the frequency is higher than the set frequency, a speed increasing command is output.
And a cutting speed control means 84 for increasing / decreasing the relative movement speed of the blade and the sheet material according to the deceleration command and the speed increase command.

[0013]

When the cutting resistance due to the thickness of the sheet material to be cut, the number of stacks, the blade wear, or the like changes, it appears as a change in the reciprocating frequency of the blade. Therefore, according to the control method of the cutting device of the present invention having the above configuration, the change in the cutting resistance can be detected by detecting the change in the reciprocating frequency of the blade.

Here, when the reciprocating frequency is lower than a predetermined set frequency, the cutting resistance is reduced by reducing the relative moving speed of the blade and the sheet material. If the cutting resistance decreases, the reciprocating frequency of the blade increases and recovers to the set frequency. On the contrary, when the reciprocating frequency is higher than the set frequency, the cutting resistance is increased by increasing the relative moving speed of the blade and the sheet material. If the cutting resistance increases, the reciprocating frequency of the blade decreases and recovers to the set frequency.

In this way, an increase / decrease in cutting resistance due to various factors is detected by an increase / decrease change in the frequency of the blade from the set frequency, and based on the change, relative movement between the blade and the sheet material. When the speed is controlled, the cutting is performed under the optimum conditions. And according to the cutting device of the present invention,
The set frequency is set by the frequency setting means, the change in the reciprocating frequency of the blade is detected by the frequency detecting means, and the actual frequency is set by comparing the actual frequency with the set frequency by the comparing means. When the frequency is higher than the frequency, an acceleration command is output to increase the relative moving speed between the blade and the sheet material, and when the actual frequency is lower than the set frequency, a deceleration command is output, and the blade and the By controlling so as to reduce the relative movement speed of the sheet material, the relative movement speed of the blade and the sheet material is controlled according to the increase or decrease of the cutting resistance due to various factors, and the optimum conditions are satisfied. Cut.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cutting apparatus and a control method therefor according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall view of the cutting device, and FIG. 2 is an enlarged sectional view of a main part of a head portion of the cutting device.

In FIG. 1, 1 is a cutting device, 2 is a cutting table, 3 is a moving bridge that reciprocates on the cutting table 2 in the X-axis direction shown, and 4 is on the moving bridge 3 in the Y-axis direction shown. It is a head part that moves back and forth. The moving bridge 3 is reciprocally moved by an X-axis motor 31,
The head unit 4 is reciprocally moved by a Y-axis motor 41.

In FIG. 2, the head portion 4 includes a blade 5 for cutting, a drive mechanism 6 for converting the rotational movement of the induction motor 61 into a reciprocating movement to reciprocally vibrate the blade 5, and the blade 5. A rotation mechanism 7 for rotating about its major axis is provided.

In FIG. 3, which shows a block diagram of the cutting apparatus of the present invention, the induction motor 61 is configured such that the AC power having a frequency based on the set frequency A set by the frequency setting section 81 is frequency control section 82. The driving speed is controlled at a rotational speed slightly reduced from the synchronous rotational speed determined by the frequency according to cutting resistance and the like.

The actual frequency B of the blade 5 is detected by a frequency detecting device 9 provided at the upper end of the blade. In the comparison unit 83, the ratio A / B between the set frequency A and the detected actual frequency B is compared with a predetermined limit value C, and when the ratio A / B exceeds C, the cutting speed deceleration command is issued. When D is output and the ratio A / B is recovered to be less than C, the cutting speed increase command U is output.

The deceleration command D and the speed increase command U are input to the X / Y-axis speed setting unit 84 and decomposed into speed control signals for the X-axis component and the Y-axis component based on the current blade orientation. The rotational speeds of the X-axis motor 31 and the Y-axis motor 41 are controlled by the X-axis control unit 85 and the Y-axis control unit 86, respectively, and as a result, the relative movement speed of the blade 5 and the sheet material S. Is controlled to the optimum condition.

If the deceleration command D is continuously output for a predetermined time limit or longer, there is a possibility of some accident. Therefore, it is preferable to output an alarm signal and request inspection.

In this way, according to the cutting device 1, it is detected by the frequency of the blade that an unreasonable force is applied to the blade, such as the twisting of the blade during cutting, in the X and Y axis directions. Since the cutting resistance is reduced by lowering the moving speed of the sheet, it is possible to prevent the sheet material from being cut poorly. Then, since the frequency is detected by a non-contact proximity switch or the like,
Problems such as wear do not occur.

Since the above control can be performed completely automatically, the work efficiency of cutting is good. When the cutting resistance is reduced and the frequency is increased, the moving speed is recovered and the cutting can be performed at high speed. In this way, the change in cutting resistance is detected and controlled so as to cut at an appropriate moving speed.
It is also possible to detect and cut the optimum conditions in real time without specifying the conditions that can be known in advance such as the material of the sheet material, the thickness of the stack, the atmosphere, etc., and generate and transmit control data. It is also possible to obtain the effect that it can be simplified.

The drive means is not limited to the induction motor, but a DC motor or the like can be used.

[0026]

As described above, according to the control method of the present invention, it is detected by the frequency of the blade that an excessive force is applied to the blade, such as a twist of the blade during cutting, and X, Since the cutting resistance is reduced by decreasing the moving speed in the Y-axis direction, it is possible to prevent the cutting failure of the sheet material and to appropriately control the cutting device.

Further, according to the cutting device used in the above method, by providing means for detecting the frequency of the blade,
Detecting that an unreasonable force is applied to the blade such as twisting of the blade during cutting, the moving speed is slowed down, so it is possible to automatically perform proper cutting work without causing cutting defects. Of.

[Brief description of drawings]

FIG. 1 is an overall view of a cutting device of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a head portion of the cutting device.

FIG. 3 is a block configuration diagram of the cutting device.

[Explanation of symbols]

 1 Cutting Device 31, 41 Moving Means 5 Blades (Cutting Means) 81 Frequency Setting Means 83 Comparing Means 84, 85, 86 Cutting Speed Control Means 9 Frequency Detection Means A Set Frequencies B Actual Frequencies C Limit Values D, U Acceleration / deceleration command D Deceleration command U Acceleration command S Sheet material

Claims (2)

[Claims] 1. A method of controlling a cutting device, comprising: cutting means for cutting at least one sheet material by a reciprocating vibrating blade; and moving means for relatively moving the blade and the sheet material. When the actual frequency of the blade reciprocally vibrating is detected and the actual frequency is lower than a predetermined set frequency, the relative moving speed between the blade and the sheet material is reduced, and the actual frequency is A method of controlling a cutting device, comprising controlling so that a relative moving speed of the blade and the sheet material is increased when the number of vibrations exceeds a predetermined set frequency. 2. A cutting device comprising cutting means for cutting at least one sheet material by a blade that reciprocally vibrates, and moving means for relatively moving the blade and the sheet material. The frequency setting means for setting the set frequency, the frequency detecting means for detecting the actual frequency at which the blade actually reciprocates, and the deceleration command is output when the actual frequency is lower than the set frequency. Comparing means for outputting a speed-up command when the number of vibrations exceeds the set frequency, and cutting speed control means for increasing / decreasing the relative moving speed of the blade and the sheet material by the deceleration command and the speed-up command. A cutting device characterized by the above.