JPH06155381A - Abnormality detector for cut material in a cutter - Google Patents

Abstract

PURPOSE:To detect abnormality such as crease in a material to be cut or double folding before cutting by detecting the height of the material to be cut at each predetermined interval, by storing the detected values, and by making comparison between variation in the values detected for each section and a set value which is predetermined for detecting abnormality. CONSTITUTION:A controller 35 of a cutter is provided with a detection part 36 for detecting a pulse issued by an encoder, a memory 37 for storing the value, and a setting part 43 of a set value, which is changed according to the cutting condition of plain cloth, and which is a base for judging abnormality. A central processing unit for controlling the cutter is provided, to calculate variation between the current height of a material to be cut stored in the memory 37 and the previous height of the material to be cut by a calculation part 40, and the result is compared with the set value by a comparison part 41. When the amount of variation exceeds the set value, it is judged by a judgement means 39 that abnormality occurs in the material to be cut. When it is judged that there is abnormality, an abnormal part is corrected before cutting, and appropriate procedure can thus be conducted to carry out normal cutting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting machine for cutting a material to be cut placed on a cutting support surface into a desired shape with a cutter blade, and a device for detecting an abnormal swelling of the material to be cut. It is about.

[0002]

2. Description of the Related Art When simultaneously cutting a large number of fabrics such as knitted fabrics and cloths and flexible cut materials such as synthetic resin sheets in a state of being piled up, it is desirable to cut while leaving wrinkles on the cut material. There is a problem that it is cut into a shape different from the shape. Therefore, conventionally, an operator visually corrects an abnormal bulge on the surface of the material to be cut or confirms it by touch.

There is a problem in that it is time-consuming to perform such inspections by the operator's visual inspection and touch, since it is necessary to constantly monitor them. Further, there is a problem that inspection requires skill and it is easy to overlook an abnormality.

Prior art techniques for addressing the above problems include:
For example, it is described in part of Japanese Examined Patent Publication No. 55-45357. The load acting on the cutter blade is different when cutting a wrinkled place and when cutting a wrinkle-free place. The prior art pays attention to the elastic deformation of the cutter blade due to the fluctuation of the load, and proposes a configuration in which wrinkles and abnormalities are detected by the elastic deformation of the cutter blade.

[0005]

However, in the prior art described in the above publication, the cutter blade cuts a portion of the material to be cut that has an abnormality, and the cutter blade is elastically deformed before the material to be cut has an abnormality. Is detected. Therefore, there is a problem that the cut material becomes a defective product because it is impossible to detect the abnormal cut material portion before cutting and correct the cut material in advance. Further, since the abnormality is detected by the elastic deformation of the cutter blade, for example, when cutting the body and the parts such as the sleeves, the number of layers of the fabric of the sleeve portion is doubled to that of the body portion. There is also a problem in handling the stretched fabric so that the left and right sleeves can be cut. This is also a problem that applies to the case where the cloths to be cut having different materials such as hardness are placed and cut.

The present invention has been proposed in view of the above-mentioned problems, and the swelled portion of the surface of the material to be cut due to wrinkles or double folds of the material to be cut, which hinders accurate cutting, is cut off before cutting. In order to improve the productivity of the cutting machine. Further, as described above, an abnormality detection device for a cutting machine is provided which can accurately detect an abnormality in the material to be cut even when the cutting material to be cut has different placement conditions on the cutting support surface. The purpose is to do.

[0007]

In order to achieve the above object, in the apparatus of the present invention, the material to be cut is placed and fixed on a mounting table having a cutting support surface formed on the upper surface thereof, and the upper portion of the cutting support surface is fixed. In the cutting machine, in which a cutter blade that is movable in any direction is arranged, and the material to be cut placed on the cutting support surface is cut into a predetermined shape by the cutter blade, the lower surface is cut when the material to be cut is cut. A blade support that abuts the upper surface of the cutting material and supports the cutter blade so that it can slide up and down, and the height of the material to be cut placed on the cutting support surface as displacement of the support is detected at predetermined intervals. Detecting means, a storage means for storing the height of the material to be cut detected by the detecting means, and a change between the current height of the material to be cut and the height of the previous material to be cut stored in the storage means. Calculate the amount and compare the amount of change with a preset value for abnormality detection It was calculated if the amount of change exceeds the set value determination means that an abnormality in the cut material occurs provided respectively.

Next, the detecting means of the abnormality detecting device is characterized in that it detects information about the height of the material to be cut in that section for each predetermined cutting distance and / or for each predetermined cutting time.

Next, the judging means sets a plurality of height values of the material to be cut detected at predetermined intervals as one unit, and sets the current height of the material to be cut and the detected height. It is characterized by comparing the height with the difference in the change amount most among them, and determining that an abnormality has occurred in the material to be cut when the calculated change amount exceeds the set value.

[0010]

First, the material to be cut is placed and fixed in a laminated state on the cutting support surface of the cutting machine. Next, for cutting, the material to be cut is cut into a desired shape while moving the cutter blade up and down, and the cutter blade is moved from one side of the cutting support surface to the other. At the time of cutting, the height of the material to be cut in the section is detected and stored at predetermined intervals, and the change amount of the detected value in the section is calculated. When the change amount is compared with a predetermined set value for abnormality detection, and the change amount exceeds the set value, for example, wrinkles or wrinkles are formed on the material to be cut on the lower side in the cutting proceeding direction of the cutter blade. Abnormal parts such as double folds can be detected before being cut by the cutter.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. <Embodiment 1> FIG. 1 is a perspective view showing the outline of a cutting machine provided with a sealing device for a suction type mounting table, and FIG. 2 is a side view thereof, in which reference numeral 1 generally indicates the cutting machine.

This cutting machine 1 is provided with three suction boxes 3.3.3 arranged horizontally on a base frame 2 and arranged so as to run endlessly on the suction boxes 33.3. The bristles 5 forming the cutting support surface 4 and the fabric 6 such as knitted fabric or knitted fabric disposed on the cutting support surface 4 via the suction boxes 3.3.3 A suction type mounting table 9 formed by a suction duct 7 and a suction device 8 for generating a suction force for fixing the blade, and a cutter device 10 arranged above the cutting support surface 4 so as to be movable in any direction. It is configured.

The suction boxes 3, 3, 3 are formed in a rectangular shape that matches the length and width of the effective cutting space.
Endless chains are arranged along the longitudinal direction of the base frame 2 on both sides in the width direction of the suction boxes 3, 3, 3. A large number of receiving plates, both ends of which are supported by both chains, are fixed to the outer circumference of the both-side chains.
The endless track type conveyor having a well-known structure as disclosed in Japanese Patent No. 59, etc. is formed. The bristles 5 are arranged on the upper surface of each receiving plate to form a cutting support surface 4.

The cutter device 10 comprises an X-axis direction moving section 11 and a Y-axis direction driving section 12. The X-axis direction moving unit 11 winds the moving bladed belt 15 over the gears 13 and 14 rotatably provided between both ends of the suction type mounting table 9 in the longitudinal direction. Belt 1 with blade for this movement
The lower end part of the block 16 is connected to a part of 5. The gear 14 on the one end side around which the moving blade belt 15 is wound and the output shaft 18 of the electric motor (driving motor) 17 are connected by the driving blade belt 19. By controlling the rotation direction and speed of the drive motor 17, the cutter blade 20 moves in the X-axis direction, that is, the suction-type mounting table 9 via the moving blade belt 15 and the driving blade belt 19. It can be moved in the longitudinal direction.

The Y-axis direction driving unit 12 is provided with the X-axis direction moving units 11.1 respectively provided in the width direction of the suction type mounting table 9.
The guide bridge 21 is mounted across the space. A frame 22 supporting the cutter blade 20 is guided by the guide bridge 21 by a Y-axis direction driving motor (not shown) and is moved in the Y-axis direction (see FIG. 3).

As shown in FIGS. 3 to 4, the cutter blade 20 is vertically vibrated by a vibrating means 23 provided at the upper end. Below the oscillating means 23, there is provided a blade edge direction control section 24 for controlling the cutting edge of the cutter blade 20 so as to always be in the direction of cutting. Below the blade direction control unit 24, a blade support 26 is provided which supports the cutter blade 20 so as to be able to slide up and down, and when the cutter blade 20 cuts the material 6, the lower surface abuts the upper surface of the material 6. Has been.

The blade support 26 is provided with a sliding block 29 which can be moved up and down below the oscillating means 23 of the guide rods 28 provided upright on the casing 25 of the cutter device 10. The upper end of the blade support 26 is supported by the sliding block 29, and the air cylinder (not shown) is moved up and down together with the oscillating means 23.

Next, each component of the abnormality detecting device for the cloth 6 in the cutting machine according to this embodiment will be described. On the cutting machine side, a "L" -shaped bracket 30 in a side view is extended from a sliding block 29 that supports the blade support 26 that is vertically displaced. A rotary encoder 31 is fixed to the tip of the bracket 30. The rack 3 that meshes with the pinion gear 32 of the rotary shaft of the rotary encoder 31.
3 is fixed to the casing 25 so that the displacement amount of the height of the laminated fabrics 6 at the time of cutting can be detected. As the fabric height detector, it is of course possible to use a distance sensor using ultrasonic waves, and the fabric height detector is not limited to the encoder of this embodiment.

Further, the controller 35 shown in FIG.
A central processing unit (CPU) 38 that controls the cutting machine is provided. In the CPU 38, an arithmetic unit 40 is provided as a judging means 39 which is a part of the configuration of the abnormality detecting device of the present invention.
Then, the comparison unit 41 is prepared, and it is determined whether or not the cloth 6 is abnormal. Further, in the controller 35, a detection unit 36 that detects a pulse generated by the encoder 31 provided in the cutting machine and a memory 37 that stores the detected value.
Is provided. Further, a setting value setting unit 43 is provided as a basis for abnormality determination, and the setting value can be rewritten according to the cutting conditions such as the material and the number of layers of the cloth 6.

The operation of the abnormality detecting device constructed as described above will be described below. First, a fabric (cutting material) 6 such as a knitted fabric in a predetermined number of layers is supplied onto the cutting support surface 4 by a spreading machine, and a suction force is applied to the suction boxes 3, 3, 3. Then, it is firmly sucked and fixed on the cutting support surface 4. Next, the blade support 26 is lowered so that the lower surface contacts the upper surface of the cloth 6, and the cutter device 10 is operated to cut the cloth 6 into a predetermined shape. Then, during the above cutting work, the encoder 31 operates the fabric 6 at a predetermined cutting distance.
To detect the height of.

The operation of the abnormality detecting device will be described below with reference to the block diagram of FIG. Every time the blade support 26 moving on the cloth 6 placed on the cutting support surface 4 moves the above predetermined distance, in the case of the present embodiment, every 3 cm is cut as the predetermined cutting distance, The height of the cloth 6 is detected. The value of the height of the cloth 6 on the cutting support surface 4 is detected via the interface as a pulse generated by the rotation of the rotary shaft of the encoder 31. The value detected at each point is read by the CPU 38 and stored in the memory 37.
Memorized in.

From the value relating to the height of the cloth 6 detected and stored as described above, the calculation unit 40 calculates the amount of change in the stored value each time the above predetermined distance is cut. In addition, a setting value that is a basis for determining that the cloth 6 has an abnormality is input to the setting unit 43 via the man-machine interface. Then, the arithmetic unit 40 described above
In the comparison unit 41, the value calculated in step 1 and the value input to the setting unit 43 are compared and determined whether or not the amount of change in the height of the cloth 6 exceeds the set value.

A flow chart at that time is shown in FIG.
First, in step S2, the amount of change Am between the detection value at the start point and the detection value at the end point between the predetermined cutting distances stored in the memory 37 is calculated. In step S3, it is determined whether or not the change amount Am exceeds a preset value for abnormality detection. If the change amount Am does not exceed the set value, the process proceeds to step S5 and ends. Further, if there is a swelling A on the surface 6a of the cloth 6 as shown by an imaginary line in FIG. 4 due to wrinkles or double folds inside the cloth 6, the change amount Am exceeds the set value in step S3, and step S4 Then, it is determined that there is an abnormality in the fabric 6 and it is abnormal. If it is determined to be abnormal, the cutting is stopped and an error message is displayed or an alarm is generated. By notifying the operator of the abnormality of the cloth 6, the operator can take measures to correct the abnormal portion of the cloth 6 before being cut.

Further, during cutting, the cutter blade 20 is worn and becomes unsharp or breaks, so that the cloth 6 cannot be cut sufficiently and wrinkles or folds are caused in a part of the cloth 6, resulting in swelling A. In this case, in the same way as described above,
The abnormality detection device detects an abnormality.

The flow of FIG. 7 is during the cutting work, that is,
After the cutter blade 20 penetrates the cloth 6, the cutter blade 20
Until the cloth 6 is disengaged from the cloth 6, it is repeatedly performed at predetermined cutting distances to judge whether or not the cloth 6 is abnormal. When the cutter blade 20 is released from the cloth 6 and goes up before reaching the predetermined cutting distance, the value at the position is processed as the end point. Further, among the values related to the height of the cloth 6 at the start point and the end point between the predetermined distances stored in the memory 37, the value of the start point is initialized each time the determination is made, and the value of the end point is determined in the next abnormality determination. Used as the starting point value for.

Since the cutter blade 20 detects the height of the cloth 6 within a predetermined section after the cutter blade 20 penetrates the cloth 6 until it is disengaged, parts such as the body and both sleeves are detected. Even when the material 6 to be cut has different placement conditions on the cutting support surface 4 as in the case of cutting, an abnormality in the material 6 can be accurately detected.

Further, even when the cutter blade 20 is worn and becomes less sharp during cutting, the fabric is not sufficiently cut due to breakage, and a crease occurs due to wrinkles or folds in a part of the fabric. Since this can be detected by the detector, there is also an advantage that an abnormality such as wear or damage of the cutter blade 20 can be detected together with an abnormality of the cloth.

<Embodiment 2> In the abnormality detecting device for the cloth 6 in the cutting machine, the height of the cloth 6 is detected by the detecting means at each predetermined cutting distance instead of at each relatively short cutting distance as in the first embodiment. However, when the cutting distance is set to be long to some extent, for example, every 10 centimeters, the accuracy is lowered. That is, even if the height of the cloth 6 at the time of cutting the cloth 6 by 10 cm is detected, even if there is an abnormal swelling due to wrinkles or double folds within the predetermined cutting distance of 10 cm, Anomalies may not be detected.

Therefore, in the second embodiment, as in the first embodiment, the detecting means of the abnormality detecting device is used for the fabric 6 for each predetermined cutting distance.
An example will be shown in which the height of the cloth 6 is detected and the height of the cloth 6 is detected at predetermined intervals within the section.

As shown in FIG. 8, the encoder 31 detects the height of the cloth 6 at each of the predetermined cutting distances L1, L2, L3, ..., Ln, and further at a predetermined time within the section of L2 and L3. The height of the cloth 6 is detected at t5, t6, ..., T9, t10. The number of times of detection in the section is the cutter blade 20
Increases or decreases depending on the speed of progress.

In the section L2-L3, the encoder 3
Each time a value is detected by 1, the detected value is stored in the memory 3
7, and the calculation of the amount of change with respect to the value already detected between the sections L2 and L3 is performed by the calculation unit 40. For example, the current value of fabric 6 at t8
When the value h4 related to the height of H2 is detected, the amount of change from the value h2 at t6, which has the largest difference from h4 among the values detected in this section, is calculated by the calculation unit 40, and as in the first embodiment. The comparison unit 41 compares and determines the set value. Even when it is determined to be abnormal, the same processing as in the first embodiment is performed.

<Third Embodiment> In the third embodiment, the processing of the raised portion when the abnormality of the cloth 6 is detected by the abnormality detecting device of the cloth 6 in the cutting machine of the above-described Embodiment 1 or 2 is performed on the cutting machine side. Automatically. In this embodiment, when the difference between the change amount Am of the detected value when abnormality is detected and the set value for abnormality detection is Bm, the fabric 6 rises according to the ratio of the difference Bm to the set value. It is characterized in that the processing method of the part is automatically selected and executed.

The operation of processing the raised portion of the cloth 6 in the above cutting machine will be described below with reference to the flowchart of FIG. First, in step U2, the ratio of the difference Bm between the change amount Am of the detected value of the height of the detected cloth 6 and the set value for the abnormality detection to the set value is calculated,
Then, it is determined whether the ratio is 10% or less. When the ratio of the difference Bm to the set value is 10% or less, the process proceeds to step U3, the cutting speed is reduced, and the fabric 6 is cut by a predetermined distance. Then, in step U4, the height of the cloth 6 after cutting the predetermined distance is detected, and the change amount Cm from the detected value of the height of the cloth 6 before the abnormality detection is calculated, and in step U5, the change amount Cm is the abnormality detection value. It is determined whether or not the set value for is exceeded. When the amount of change Cm does not exceed the set value, the cutting is performed again at the original cutting speed, and the process proceeds to step U15 and ends. When the change amount Cm exceeds the set value for abnormality detection in step U5, the process proceeds to step U7 to stop the cutting machine,
It moves to 15 and ends.

Next, when the difference Bm between the change amount Am of the detected value of the height of the cloth 6 which is detected to be abnormal in step U2 and the set value for detecting abnormality is larger than 10%, step U8 Then, it is determined whether or not the ratio of the difference Bm to the set value is 20% or less. When this ratio is 20% or less, the process proceeds to step U9 to suspend the cutting. In step U10, the blade support 26, which is in contact with the fabric 6 in the lowered state, is moved up and down several times to flatten the abnormal raised portions such as wrinkles and double folds formed in the fabric 6. Then, in step U11, the height of the cloth 6 is detected, and the change amount Cm between this detected value and the detected value of the height of the cloth 6 before the abnormality detection is calculated. In step U12, the change amount Cm is detected because of the abnormality. It is determined whether or not the set value of is exceeded. When the change amount Cm does not exceed the set value, cutting is started again in step U13, and the process proceeds to step U15. When the amount of change Cm exceeds the set value in step U12, the process proceeds to step U14, the cutting machine is stopped, and the process proceeds to step U15 to finish. If the ratio of the difference Bm to the set value is greater than 20% in step U8, the process proceeds to step U14 to stop the cutting machine. Then, the process proceeds to step U15 and ends.

Therefore, even after the abnormality detection device detects the abnormality of the cloth 6, the swelling of the cloth 6 that can be corrected by the cutting machine can be removed. In the case where the cutting machine is stopped at step U7 or step U14, the abnormal swell formed on the fabric 6 cannot be removed by the processing by the cutting machine alone, or cannot be removed. Is. Therefore, in this case, for the first time, the operator must take measures to correct the abnormally raised portion.

In the first embodiment, the height of the cloth 6 at each predetermined cutting distance is detected, and in the second embodiment, the height of the cloth 6 at each predetermined cutting time within the predetermined cutting distance is detected. Although the abnormality of the cloth 6 is determined by the above, the present invention is not limited to the above-described embodiment, and the unit of each predetermined interval is only time, or only distance, or time and time, distance and distance, or distance. It is needless to say that the present invention can be carried out within a range not departing from the gist of the present invention, such as a combination of the time and time and the combination thereof.

Further, as the cutting machine capable of implementing the abnormality detecting device for the fabric 6 of the present invention, a type in which the suction type mounting table 9 can be moved is shown, but the apparatus of the present invention is the suction type mounting table 9.
Needless to say, it can be applied to a fixed type.

In the third embodiment, the processing of the raised portion of the cloth 6 performed by the cutting machine after the abnormality is detected is set to the set value by the difference Bm between the change amount Am and the set value when the abnormality is detected. Depending on the ratio, the process is selected from the following three types of processing. Process 1: As in steps U3 to U15, after the cutting speed is reduced and the cutting is performed for the predetermined cutting distance, the height of the cloth 6 is detected,
Amount of change C between the detected value and the detected value before the abnormality is detected
m is calculated and compared with the set value. When the amount of change Cm is less than or equal to the set value, the cutting speed is increased to return to the normal cutting speed.
When the change amount Cm exceeds the set value, the cutting machine is stopped. Process 2: The cutting is temporarily stopped as in steps U9 to U15, and the blade support 26 that is in contact with the fabric 6 in the lowered state is moved up and down several times, and then the height of the fabric 6 is detected. A change amount Cm between the value and the detection value before the abnormality is detected is calculated and compared with the set value. When the change amount Cm is less than or equal to the set value, cutting is restarted. When the change amount Cm exceeds the set value, the cutting machine is stopped. Process 3: The cutting machine is stopped as in steps U14 to U15. However, the processing of the raised portion of the cloth 6 by the three types of cutters, that is, processing 1 and processing 2
It is needless to say that an appropriate process can be selected from the combination of the process 1 and the process 3, the process 2 and the process 3 and the like from the process 3.

[0039]

As described above, in the abnormality detecting device for the material to be cut in the cutting machine according to the present invention, the blade support is brought into contact with the material to be cut to move the material to be cut during cutting. By providing a detecting means for detecting the rise due to wrinkles and double folds as the displacement of the support, it is possible to detect with an abnormality detection device immediately before cutting the place with the rise with a cutter blade, Before cutting, it is possible to correct the swelling of that portion and take appropriate measures so that normal cutting can be performed.

Further, since the detecting means detects the height of the material to be cut at predetermined intervals to detect the abnormality of the material to be cut within the predetermined section, it is placed on the cutting support surface. When the cut material is flat on the cut material but is gently inclined overall, for example, the cut material is inclined from one direction to the other and the difference between the maximum value and the minimum value of the height is Even if the set value for abnormality detection is exceeded, it does not hinder the cutting, so no abnormality is detected.
Accurate because the target is to be detected only when there is a local abnormality such that the amount of change in the height of the material to be cut exceeds the set value in a relatively narrow predetermined section, and it causes trouble in cutting. The abnormality of the material to be cut can be determined, and the productivity of the cutting machine can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a cutting machine for carrying out the apparatus of the present invention.

FIG. 2 is a side view showing an outline of a cutting machine for carrying out the apparatus of the present invention.

FIG. 3 is a side view showing an outline of a cutter device portion according to the first embodiment.

FIG. 4 is a front view showing an outline of a cutter device portion according to the first embodiment.

FIG. 5 is a cross-sectional plan view schematically showing a cutter device portion according to the first embodiment.

FIG. 6 is a block diagram showing a circuit configuration in a controller that implements the device of the present invention.

FIG. 7 is a diagram showing a flowchart of abnormality detection according to the first embodiment.

FIG. 8 is a diagram showing cutting distance / time and fabric height in Example 2.

FIG. 9 is a diagram showing a flowchart of processing of an abnormally raised portion according to the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cutting machine 4 ... Cutting support surface 6 ... Material to be cut (fabric) 20 ... Cutter blade 26 ... Blade support 27 ... Abnormality detector 29 ... Movable member 30 ... Detection member 31 ... Rotary encoder

Claims (3)

[Claims] 1. A material to be cut is placed and fixed on a mounting table having a cutting support surface formed on an upper surface thereof, and a cutter blade movable in an arbitrary direction is disposed on an upper portion of the cutting support surface to cut the cutting material. In a cutting machine that cuts the material to be cut placed on the support surface into a predetermined shape with a cutter blade, when cutting the material to be cut the lower surface abuts the upper surface of the material to be cut and supports the cutter blade so that it can slide up and down. Blade support, detection means for detecting the height of the material to be cut placed on the cutting support surface as a displacement of the support at predetermined intervals, and the height of the material to be cut detected by the detection means. For calculating the change amount between the current height of the material to be cut and the height of the previous material to be cut stored in the storage means, and the amount of change and preset abnormality detection Compared with the set value, if the calculated change exceeds the set value, there is an abnormality in the material to be cut. Abnormality detecting device of the cut material in cutting machine, characterized in that it comprises a pear was the determining means. 2. The cutting device according to claim 1, wherein the detecting means of the abnormality detecting device detects information regarding the height of the material to be cut in the section for each predetermined cutting distance and / or for each predetermined cutting time. Machine for detecting abnormalities in the material to be cut. 3. The determination means of the anomaly detection device uses a plurality of height values of the material to be cut detected at predetermined intervals as one unit, and detects the current height of the material to be cut. Comparing the height with the difference of the most change amount among the height, it is determined that an abnormality has occurred in the material to be cut when the calculated change amount exceeds the set value. An apparatus for detecting an abnormality of a material to be cut in the cutting machine according to 1.