JP3149117B2 - Abnormality detection device for cut material in cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting an abnormal swelling of a material to be cut in a cutting machine in which a material to be cut mounted on a cutting support surface is cut into a desired shape by a cutter blade. It is about.

[0002]

2. Description of the Related Art When a large number of flexible cut materials such as a knitted cloth or a cloth or a synthetic resin sheet are cut at the same time while being superposed, it is desirable that the cut material be cut with wrinkles. There is a problem that it is cut into a shape different from the shape. For this purpose, conventionally, an operator visually corrects an abnormal swelling on the surface of the cut material, or confirms it by touch.

[0003] Inspection by visual inspection or touch of such workers requires constant monitoring, and there is a problem that it takes time and effort. Further, there is a problem that the inspection requires skill and an abnormality is easily overlooked.

The prior art to address the above problems is:
For example, it is described in a part of Japanese Patent Publication No. 55-45357. The load acting on the cutter blade differs between the case where a wrinkled area is cut and the case where no wrinkled area is cut. The prior art has focused on the fact that the cutter blade is elastically deformed due to the fluctuation of the load, and has proposed 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-mentioned publication, the material to be cut is abnormal only after the cutter blade cuts the abnormal material to be cut and the cutter blade is elastically deformed. Is detected. Therefore, there is a problem that the cut material becomes a defective because the cut material having an abnormality cannot be found before cutting and the cut material cannot be corrected in advance. In addition, since abnormalities are detected by elastic deformation of the cutter blade, for example, when cutting parts such as the body and both sleeves, the number of fabrics in the sleeve part is doubled as that of the body part, and one time. There is still a problem in the cutting of the stretched fabric so that the left and right sleeves can be cut. This also applies to the case where the material to be cut, which is made of a material having a different hardness or the like, is placed and cut.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems, and it is necessary to prevent wrinkles or double folds on the surface of a material to be cut which may hinder accurate cutting before cutting. And to improve the productivity of the cutting machine. Further, even when the mounting conditions of the cut material to be cut on the cutting support surface are different as described above, an abnormality detecting device of a cutting machine capable of accurately detecting an abnormality of the cut material is provided. The purpose is to do.

[0007]

In order to achieve the above object, in the apparatus according to the present invention, a material to be cut is placed and fixed on a mounting table having a cutting support surface formed on an upper surface, and the upper part of the cutting support surface is fixed. In a cutting machine in which a cutter blade which can be freely moved in any direction is arranged, and the cut material placed on the cutting support surface is cut into a predetermined shape by the cutter blade, the lower surface is cut when the cut material is cut. A vertically displaceable blade support that abuts on the upper surface of the cutting material and supports the cutter blade so that it can slide up and down , and cutting.
Given the height of the cut material during the vertical variation <br/> position of the blade support which moves on the cut material is placed on the cutting support plane
Detection means for detecting at predetermined intervals in a period, and storage means for storing the height of the cut material in the detected predetermined interval by said detection means, the current stored in the storage means of the cut material calculating the height and before the amount of change in the height of the cut material, the if the amount of change set values and to compare, which is calculated for the preset failure detection and the amount of change exceeds the preset value A judging means for judging that a local abnormality has occurred in the cut material is provided.

Next, the detecting means of the abnormality detecting device is characterized in that information on the height of the cut material in the section is detected at every predetermined cutting distance and / or at every predetermined cutting time.

Next, the judging means sets a plurality of height values of the cut material detected at predetermined intervals as one unit, and determines the current height of the cut material and the detected height in the plurality. Among them, the height with the largest difference in the amount of change is compared, and when the calculated amount of change exceeds a set value, it is determined that an abnormality has occurred in the cut material.

[0010]

First, the material to be cut is placed and fixed on the cutting support surface of the cutting machine in a stacked state. 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 of the cutting support surfaces to the other. At the time of the cutting, the height of the cut material in the section is detected and stored at predetermined intervals, and the amount of change in the detected value in the section is calculated. By comparing the amount of change with a predetermined set value for abnormality detection, if the amount of change exceeds the set value, for example, wrinkles and An abnormal portion such as a double fold 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 schematically showing a cutting machine provided with a sealing device for a suction type mounting table, and FIG. 2 is a side view of the cutting machine.

The cutting machine 1 is provided with three suction boxes 3.3 horizontally arranged on a base frame 2, and arranged so as to run endlessly on the suction boxes. A bristle body 5 that forms the cutting support surface 4 and a fabric 6 such as a knitted cloth or a knitted fabric that is disposed below the suction boxes 3 and 3 and is placed on the cutting support surface 4 via the suction boxes 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 sheet, and a cutter device 10 arranged on the cutting support surface 4 so as to be movable in an arbitrary direction. It is configured.

The suction boxes 3, 3, 3 are formed in a rectangular shape corresponding to the length and width of the effective cutting space.
On both sides in the width direction of the suction boxes 3, 3, endless chains are arranged along the longitudinal direction of the base frame 2. A large number of receiving plates, both ends of which are supported by both chains, are fixed to the outer periphery of both side chains.
An endless track conveyor having a well-known structure as disclosed in JP-A-59-59 and the like is formed. On the upper surface of each receiving plate, the bristle bodies 5 are arranged to form a cutting support surface 4.

The cutter device 10 includes an X-axis direction moving unit 11 and a Y-axis direction driving unit 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 in the longitudinal direction of the suction type mounting table 9. This moving belt with blade 1
The lower end of the block 16 is connected to a part of the block 5. The gear 14 on one end on which the moving bladed belt 15 is wound and the output shaft 18 of the electric motor (driving motor) 17 are connected by a driving bladed belt 19. By controlling the rotation direction and speed of the driving motor 17, the cutter blade 20 is moved in the X-axis direction, that is, the suction type mounting table 9 via the moving bladed belt 15 and the driving bladed belt 19. Can be moved in the longitudinal direction.

The Y-axis direction drive section 12 is provided with both X-axis direction moving sections 11 and 1 provided in the width direction of the suction type mounting table 9 respectively.
The guide bridge 21 is mounted over one space. A frame 22 supporting the cutter blade 20 is guided by the guide bridge 21 and moved in the Y-axis direction by a Y-axis direction driving motor (not shown) (see FIG. 3).

The cutter blade 20 is vibrated up and down by vibrating means 23 provided at the upper end as shown in FIGS. A cutting edge direction control unit 24 that controls the cutting edge of the cutter blade 20 to be always cut is provided below the vibration generating means 23. Further below the cutting edge direction control unit 24, a blade supporting body 26 is provided, which supports the cutter blade 20 so as to be able to move up and down and slides the same, and the lower surface of which contacts the upper surface of the cloth 6 when the cutter blade 20 cuts the cloth 6. Have been.

The blade support 26 is provided with a sliding block 29 that can move up and down below the vibration generating means 23 of guide rods 28 erected 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 is moved up and down together with the vibration generating means 23 by an air cylinder (not shown).

Next, each configuration of the apparatus for detecting an abnormality of the cloth 6 in the cutting machine according to the present embodiment will be described. An “L” -shaped bracket 30 as viewed from the side extends from a slide block 29 that supports the blade support 26 that is displaced in the up-down direction on the cutting machine side. A rotary encoder 31 is fixedly mounted on the tip of the bracket 30. Rack 3 meshing with pinion gear 32 of the rotary shaft of rotary encoder 31
3 is fixed to the casing 25 so that the amount of displacement of the height of the laminated fabric 6 at the time of cutting can be detected. As the cloth height detector, for example, a distance sensor using an ultrasonic wave can of course be used, and it is not limited to the encoder of the present embodiment.

The controller 35 shown in FIG.
A central processing unit (CPU) 38 for controlling the cutting machine is provided. The CPU 38 includes an arithmetic unit 40 as a determination unit 39 which is a part of the configuration of the abnormality detection device of the present invention.
And a comparing unit 41 are prepared, and it is determined whether or not the fabric 6 has an abnormality. In the controller 35, a detecting unit 36 for detecting a pulse generated by the encoder 31 provided in the cutting machine and a memory 37 for storing the detected value are provided.
Is provided. In addition, a setting value setting section 43 serving as a basis for abnormality determination is provided, and the setting value can be rewritten according to cutting conditions such as the material of the cloth 6 and the number of layers.

The operation of the abnormality detecting device having the above-described structure will be described below. First, cloth (cutting material) 6 such as a knitted cloth in a state in which a predetermined number of sheets are laminated is supplied by a reversing machine onto the cutting support surface 4, and a suction force is applied to the suction boxes 3. Is firmly fixed on the cutting support surface 4 by suction. Next, the blade support 26 is lowered so that the lower surface is in contact with the upper surface of the cloth 6, and the cutter apparatus 10 is operated to cut the cloth 6 into a predetermined shape. During the above cutting operation, the encoder 31 moves the cloth 6 at a predetermined cutting distance.
The height of the is detected.

Hereinafter, the operation of the abnormality detecting device will be described with reference to the block diagram of FIG. Each time the blade support 26 that moves on the cloth 6 placed on the cutting support surface 4 moves the above-described predetermined distance, and in the case of this embodiment, every time the cutting support 3 cuts 3 cm 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.
Is stored.

From the value relating to the height of the cloth 6 detected and stored as described above, the amount of change in the value stored every time the predetermined distance is cut is calculated by the calculation unit 40. In addition, a setting value serving as a basis for determining that an abnormality has occurred in the cloth 6 is input to the setting unit 43 via a man-machine interface. Then, the operation unit 40
The comparison unit 41 compares the value calculated in step 2 with the value input to the setting unit 43 to determine whether the amount of change in the height of the cloth 6 does not exceed the set value.

FIG. 7 shows a flowchart at that time.
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 set value for abnormality detection. If the change amount Am has not exceeded the set value, the process moves to step S5 and ends. Further, if there is a bulge A on the surface 6a of the cloth 6 as shown by an imaginary line in FIG. 4 due to wrinkles or double folds in the cloth 6, the change amount Am exceeds the set value in step S3, and step S4 Then, it is determined that there is a swell in the dough 6 and that the fabric 6 is abnormal. If it is determined to be abnormal, the cutting is stopped and an error message is displayed and a warning is issued. By notifying the operator of the abnormality of the dough 6, the operator can take measures to correct the abnormal portion of the dough 6 before it is cut.

Also, during cutting, the cutter blade 20 was worn and the sharpness was deteriorated or broken, and the dough 6 was not cut sufficiently, and a part of the dough was wrinkled or folded and a bulge A occurred. In this case, in the same manner as described above,
Abnormality detection is performed by the abnormality detection device.

FIG. 7 shows the flow during the cutting operation, that is,
After the cutter blade 20 has penetrated the cloth 6, the cutter blade 20
Until the material is disengaged from the fabric 6, the process is repeatedly performed at predetermined cutting distances, and it is determined whether or not the fabric 6 has an abnormality. If the cutter blade 20 is lifted up after reaching the predetermined cutting distance by penetrating the cloth 6, the value at the position is processed as an end point. In addition, among the values relating 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 judgment is made, and the value of the end point is used for the next abnormality judgment. Used as the starting point value for

Further, since the height of the cloth 6 within a predetermined section from when the cutter blade 20 penetrates into the cloth 6 until the cutter blade is released is detected, parts such as the body and both sleeves are detected. Even when the placement conditions of the cut fabric 6 on the cutting support surface 4 are different, such as when cutting, the abnormality of the fabric 6 can be accurately detected.

Further, when the cutter blade 20 is worn during cutting and the sharpness is deteriorated, or when the fabric is broken and the fabric is not sufficiently cut, a part of the fabric is wrinkled or folded and a swell is generated. Since this can be detected by the detector, there is an advantage that the abnormality such as wear and breakage of the cutter blade 20 can be detected together with the abnormality of the cloth.

<Embodiment 2> The apparatus for detecting an abnormality of the cloth 6 in the cutting machine detects the height of the cloth 6 for each predetermined cutting distance by the detecting means, not for each relatively short cutting distance as in the first embodiment. However, if the cut distance is set to a certain length, for example, every 10 centimeters, the accuracy decreases. That is, by simply detecting the height of the cloth 6 at the time when the cloth 6 is cut by 10 cm, even if there is an abnormal swelling due to wrinkles or double folds in the section of the predetermined cutting distance of 10 cm, Abnormality may not be detected.

Therefore, in the second embodiment, as in the first embodiment, the detecting means of the abnormality detecting device uses the cloth 6 for every predetermined cutting distance.
A case where the height of the cloth 6 is detected at predetermined intervals within the section while detecting the height of the cloth 6 will be described as an example.

As shown in FIG. 8, the encoder 31 detects the height of the cloth 6 at the predetermined cutting distances L1, L2, L3,..., Ln, and further, at predetermined time intervals within the section between L2 and L3. At t5, t6,..., t9, t10, the height of the cloth 6 is detected. The number of detections in the section is the cutter blade 20
Is increased or decreased according to the traveling speed.

Between the sections L2 and L3, the encoder 3
Each time a value is detected by 1
7, and the calculation unit 40 calculates the amount of change with respect to the value already detected during the interval L2-L3. For example, dough 6 at t8 as the current value
When the value h4 relating to the height of h is detected, the amount of change from the value h2 at t6, which is the largest difference between h4 and the value detected in this section, is calculated by the calculation unit 40, and the same as in the first embodiment. In the comparing section 41, the comparison with the set value and the judgment are performed. Even when it is determined to be abnormal, processing is performed in the same manner as in the first embodiment.

<Embodiment 3> In the embodiment 3, the processing of the raised portion when the abnormality of the fabric 6 is detected by the abnormality detecting device for the fabric 6 in the cutting machine of the above embodiment 1 or 2 is performed by the cutting machine. Automatically with. In the present embodiment, when the difference between the change amount Am of the detection value when the abnormality is detected and the set value for the abnormality detection is Bm, the swelling of the cloth 6 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.

Hereinafter, the operation of the above-described cutting machine for processing the raised portion of the fabric 6 will be described with reference to the flowchart of FIG. First, in step U2, a ratio is calculated in which the difference Bm between the change amount Am of the detected value of the height of the cloth 6 in which the abnormality is detected and the set value for abnormality detection is set to the set value,
Then, it is determined whether the ratio is 10% or less. If the difference Bm is less than 10%, the process proceeds to step U3, where the cutting speed is reduced, and the cloth 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 is detected is calculated. In step U5, the change amount Cm It is determined whether or not the set value is exceeded. If the change amount Cm does not exceed the set value, cutting is performed again at the original cutting speed, and the process moves 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, where the cutting machine is stopped, and
Move to 15 and end.

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

Accordingly, even after the abnormality of the cloth is detected by the abnormality detecting device, if the cloth 6 is raised to such an extent that it can be corrected by the cutter, it can be removed. In the case where the cutting machine is stopped in step U7 or step U14, the abnormal bulge formed on the fabric 6 could not be removed by the processing using only the cutting machine, or it would be impossible to remove it. It is. Therefore, in this case, for the first time, a measure is taken by the operator 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 using the above-described embodiment, the abnormality is not limited to the above-described embodiment, and may be performed only in time as a unit for each predetermined interval, or may be performed only in distance, or time and time, distance and distance, or distance. It is needless to say that the present invention can be carried out without departing from the gist of the present invention, for example, by performing the combination of the time and the time.

Although a cutting machine capable of moving the suction-type mounting table 9 is shown as a cutting machine capable of implementing the apparatus 6 for detecting an abnormality of the cloth 6 of the present invention, the apparatus of the present invention employs the suction-type mounting table 9.
However, it is needless to say that the present invention 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, one of the following three types of processing is selected. Process 1: As in steps U3 to U15, after the cutting speed is reduced and cutting is performed for a predetermined cutting distance, the height of the cloth 6 is detected,
A change amount 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 change amount Cm is equal to or less than the set value, the cutting speed is increased and returned 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, the blade support 26 in contact with the cloth 6 is moved up and down several times in a lowered state, and then the height of the cloth 6 is detected. A change amount Cm between the value and the detected value before the abnormality is detected is calculated and compared with the set value. When the change amount Cm is equal to or less than the set value, the 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 three types of cutting machines process the raised portions of the fabric 6, that is, processing 1 and processing 2.
It is needless to say that an appropriate process can be selected from among the processes 3 and a combination of the processes 1 and 3 or a combination of the processes 2 and 3 and the like.

[0039]

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

Further, since the height of the cut material is detected at predetermined intervals by the detecting means to detect an abnormality of the cut material in a predetermined section, the cut material is placed on the cut support surface. When the cut material is flat on the cut material but inclined gently as a whole, for example, the cut material is inclined from one direction to the other direction, and the difference between the maximum value and the minimum value of the height is Even if the value exceeds the set value for abnormality detection, it does not hinder the cutting, and therefore, it is not detected as abnormal.
Since there is a local abnormality such that the amount of change in the height of the cut material in a relatively narrow predetermined section exceeds the set value, and it is targeted for detection only when there is a problem in cutting, accurate An abnormality of the cut material can be determined, and the productivity of the cutting machine can be increased.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a cutting machine for implementing the apparatus of the present invention.

FIG. 2 is a side view schematically showing a cutting machine for implementing the apparatus of the present invention.

FIG. 3 is a side view schematically showing a cutter unit according to the first embodiment.

FIG. 4 is a front view schematically showing a cutter unit according to the first embodiment.

FIG. 5 is a cross-sectional plan view schematically illustrating a cutter device 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 illustrating a flowchart of abnormality detection according to the first embodiment.

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

FIG. 9 is a view illustrating a flowchart of processing of an abnormal climax part according to the third embodiment.

[Explanation of symbols]

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

Claims (3)

(57) [Claims] An object to be cut is placed and fixed on a mounting table having a cutting support surface formed on an upper surface, and a cutter blade which is movable in an arbitrary direction is arranged above the cutting support surface. In a cutting machine that cuts the cut material placed on the support surface into a predetermined shape with a cutter blade, the lower surface contacts the upper surface of the cut material when cutting the cut material, and the cutter blade is slidably moved up and down. and vertically displaceable blade support which, the court during cutting
The height of the cut material placed on the blade support of the vertical displacement Kara Court <br/> cross support plane to move on cross member to within a predetermined interval
Detection means for detecting every Oite predetermined intervals, a storage unit for storing the height of the cut material in the predetermined section detected by the detecting means, the current high of the cut material stored in the storage means It is to before calculating the amount of change in the height of the cut material, compared with the set value for the preset failure detection and the amount of change,
Station to be cut material when the calculated amount of change exceeds the preset value
Abnormality detecting device of the cut material in cutting machine, characterized in that it comprises a determination means the parts abnormality has occurred. 2. The cutting device according to claim 1, wherein the detecting means of the abnormality detecting device detects information on the height of the cut material in the section at every predetermined cutting distance and / or at every predetermined cutting time. Detecting device for cut material in machine. 3. The determination means of the abnormality detecting device detects the current height of the cut material in the plurality of height values of the cut material detected at predetermined intervals as one unit. The method according to claim 1, further comprising: comparing the height with the difference in the amount of change among the heights, and determining that an abnormality has occurred in the cut material when the calculated amount of change exceeds a set value. An apparatus for detecting an abnormality of a cut material in the cutting machine according to 1.