JP2008105147A - Rotary cutter control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary cutter control device reducing waste of a cutting material. <P>SOLUTION: In this rotary cutter control device 100-1, when performing preprocessing for providing a waste material of the short length before performing cutting processing for providing a product, a cutting length setting part 41-1 sets any of the preset length (fixed) for providing the product, the cutter peripheral length and the corrected preset length as the cutting length. In this case, when the preset length (fixed) is set as the cutting length, the product is provided even in the preprocessing. Thus, since the waste material is reduced in the preprocessing, efficient and effective cutting processing of the material 1 is provided, and the waste of the material is reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary cutter control device, and more particularly to a control device for reducing waste of material when a sheet-like material is cut into a predetermined length by a rotary cutter.

  Conventionally, in order to cut a sheet-like material such as a steel plate, aluminum plate, paper, cardboard or the like that is continuously fed at a high speed into a predetermined length, for example, a rotating blade is cut following the traveling material. A rotor cutter is used.

  FIG. 1 is a schematic diagram illustrating an entire control target including a rotary cutter control device. This control target is to cut the sheet-like material 1 with a predetermined cutting length by the rotary cutter 2, and is provided on a pair of rotary cutters 2 for cutting the sheet-like material 1 and the main shaft 3 of the rotary cutter 2. The generated reduction gear 4, the electric motor 5 for driving the rotary cutter 2, and the rotation speed and rotation angle of the electric motor 5 (that is, the rotation speed and rotation angle of the main shaft 3 of the rotary cutter 2) are generated. A pulse generator (PG) 6, a drive control circuit 7 for driving and controlling the electric motor 5, a length measuring roll 8 for detecting the amount of movement of the traveling sheet-like material 1, and a pulse for detecting this amount of movement The generated pulse generator 9, the cutting completion sensor 10 for detecting that the cutting of the sheet-like material 1 by the rotary cutter 2 is completed, and the sheet-like material Mark sensor 11 detects the marks on, and composed of a rotary cutter control device 100 for controlling the rotation of the rotary cutter 2.

  Here, the mark on the sheet-like material 1 detected by the mark sensor 11 indicates the reference of the cutting position, and the rotary cutter control device 100 is configured so that the sheet is positioned at a predetermined distance from the mark position or the mark position. The material 1 is cut by the rotary cutter 2.

  FIG. 2 is a block diagram showing the configuration of the conventional rotary cutter control device shown in FIG. This conventional rotary cutter control device 100 -P includes a regular cutting circuit section 40, a stop distance setting section 60, and a comparison section 53. The standard cutting circuit 40 inputs a cutting length from a cutting length setting unit 41-P for setting the cutting length for the rotary cutter 2 to cut the material 1 and a cutting length setting unit 41-P, and detects cutting completion described later. A cutting completion timing signal is input from the circuit 43, and at the cutting completion timing, the cutting operation is completed by inputting a detection signal from the first calculation unit 42 and the cutting completion sensor 10 which use the input cutting length for calculation of actual cutting processing. A cutting completion detection circuit 43 that outputs a signal, a timing signal generating unit 44 that generates a timing signal based on the cutting completion signal, a circumference setting unit 45 that sets the circumference of the rotary cutter 2, and a pulse from the pulse generator 9 The travel distance detection circuit 46 for detecting the movement amount (seat travel distance) of the material 1 and a pulse from the pulse generator 6 are input to the rotary cutter 2. Motor rotation number detection circuit 47 for detecting the rotation number, second calculation unit 48, D / A converter 49, function generator 50, F / V (frequency / voltage) converter 51, operational amplifier 52, and mark sensor 11 is provided with a mark detection circuit 54 that inputs a detection signal from 11 and outputs the mark detection signal to the cutting length setting unit 41-P. The stop distance setting unit 60 includes a stop distance setting unit 61, a reversible counter 62, a D / A converter 63, a function generator 64, and a first comparison unit 65.

  For details of the control objects including the functions of the regular cutting circuit section 40, the stop distance setting section 60, the comparison section 53, and the rotary cutter control device 100-P, refer to Patent Documents 1 and 2. I want. For a device for making the mark position on the material 1 and the cutting position by the rotary cutter 2 coincide with each other with high accuracy, refer to Patent Document 3.

  The rotary cutter control device 100-P generates a drive signal by calculating the movement amount of the material 1 and the rotation amount of the rotary cutter 2 so that the cutting length set by the cutting length setting unit 41-P is obtained. By outputting to the drive control circuit 7, the rotation of the rotary cutter 2 is controlled and the material 1 is cut by the cutting length. In order to start the operation for obtaining the material 1 having such a cutting length as a product, the material 1 is first installed so that the rotary cutter 2 can cut the material 1. When the operator starts the operation, the material 1 travels to the rotary cutter 2 side (see FIG. 1), and after the mark sensor 11 detects the mark on the material 1, the material 1 is cut based on the mark position. Processing begins. In this case, the material 1 travels without being cut until the cutting process is started. For this reason, the waste material of comparatively long size will arise, and there existed a problem that the processing of the waste material became difficult.

  In order to solve this problem, pre-processing for cutting the material 1 into a predetermined length is performed even before cutting as a product starts. Specifically, when the operation is started after the material 1 is installed, the rotary cutter control device 100-P outputs the preprocess cutting length set in advance by the cutting length setting unit 41-P, and this preprocessing cutting is performed. A drive signal is generated so as to be long and is output to the drive control circuit 7 to control the rotation of the rotary cutter 2. When the mark detection signal from the mark sensor 11 is input, in order to perform a cutting process based on the mark position, in the cutting process after the mark position, the cutting set by the cutting length setting unit 41-P as a product. The rotary cutter 2 is rotationally controlled in order to output the length and obtain a product having the cut length. Thus, immediately after the start of operation, the material 1 does not travel without being cut, and a waste material having a preset pretreatment cutting length is generated, so that the problem that it becomes difficult to process the waste material can be solved. it can.

  As described above, the conventional rotary cutter control device 100-P performs the pretreatment for obtaining the waste material having a short length before the cutting treatment for obtaining the product. However, there is a problem that the material 1 is wasted because waste material is generated in the pretreatment. In order to cut the material 1 efficiently and effectively, it is desirable to reduce the waste material as much as possible and reduce the waste of the material. Patent Document 4 describes a technique for solving the same problem. However, this method does not cut the material 1 by controlling the rotation of the rotary cutter 2, and the control target is different. Therefore, this method cannot be directly applied to the control target shown in FIG.

JP 2001-129790 A Japanese Patent Publication No. 61-33679 JP 58-28496 A JP 2001-300634 A

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a rotary cutter control device capable of reducing waste of material to be cut.

  In order to achieve the above object, the present invention provides a rotary cutter control device for causing a rotary cutter to cut a material with a set length set in advance to obtain a product as the material travels toward the rotary cutter. With the set length to obtain the product for the length of material in the pretreatment where the cutting is performed as the product between the starting position of the material where the cutting is performed as the product and the cutting position of the material in the rotary cutter In order to obtain the material remaining length calculating means for calculating the material remaining length when cutting, the material remaining length, the circumferential length of the rotary cutter, the minimum acceleration distance required for the rotary cutter to cut the material, and the minimum acceleration distance Based on the work angle limit distance corresponding to the position of the material, the case of the cutting pattern for the length material in the pre-processing is specified The cutter initial position specifying means for specifying the initial position of the rotary cutter when starting operation and outputting a positioning signal for positioning to the initial position by the case specifying means and the case of the remaining material length and the cutting pattern A set length for obtaining the product is a first set length, a circumference of the rotary cutter is a second set length, and a set length corrected by the initial position of the rotary cutter or the circumference of the rotary cutter When the set length corrected by the distance obtained by adding the minimum acceleration distance and the minimum acceleration distance is set as the third set length, one of these set lengths is selected as the cut length, and the cut length is output as the cut length Selecting means, positioning the rotary cutter at the initial position by the positioning signal output by the cutter initial position specifying means, and selecting the cutting length So that the cut length output by stage, characterized in that to cut the material to the rotary cutter.

  Further, the present invention further provides a cutter circumference switching signal generation for generating and outputting a cutter circumference switching signal for the case where the remaining material length is longer than the work angle limit distance specified by the case specifying means. Means, a set length for obtaining the product, and a tracking distance between the starting position when the starting position of the material to be cut as a product is tracked and the cutting position of the material in the rotary cutter is compared. A correction setting value switching signal generating means for generating and outputting a correction setting value switching signal when the tracking distance is smaller than the setting length, and the cutting length selection means includes the cutter circumference switching signal. Is selected as the cutting length, and when the correction setting value switching signal is input, the corrected setting value is selected as the cutting length. And wherein the Rukoto.

  As described above, according to the present invention, a rotary cutter control device capable of reducing waste of material to be cut can be realized.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 3 is a block diagram showing the configuration of the rotary cutter control device according to the embodiment of the present invention. The rotary cutter control device 100-1 corresponds to the rotary cutter control device 100 shown in FIG. 1, and is compared with the conventional rotary cutter control device 100-P shown in FIG. The difference is in the configuration. The cutting length setting unit 41-1 receives the mark detection signal from the mark detection circuit 54 and the cutting completion signal from the cutting completion detection circuit 43, sets the cutting length to the first calculation unit 42, and sets the cutter positioning signal to the stop distance. To the unit 61.

  FIG. 4 is a block diagram showing a configuration of the cutting length setting unit 41-1 in the rotary cutter control device 100-1 shown in FIG. By applying the rotary cutter control device 100-1 including the cutting length setting unit 41-1 to the control target shown in FIG. 1, the original product is cut after the mark on the material 1 after the operation is started. Until processing is performed (during pre-processing), cutting of a predetermined length including cutting as a product is performed, and material waste is reduced. Specifically, referring to FIG. 1, first, the operator installs material 1 such that material 1 is cut by rotary cutter 2 before starting operation. In this case, the material 1 is installed at a position where the mark sensor 11 can detect the mark on the material 1. Hereinafter, in the material 1 thus installed, a mark at a position that can be detected by the mark sensor 11 is referred to as a true mark.

  Then, when the operation is started by the operation start operation by the operator, the rotary cutter control device 100-1 first outputs a cutter positioning signal to perform the initial positioning of the rotary cutter 2. When the initial positioning is completed, a cutting length for each cutting process is generated and output in order to perform a predetermined length of cutting process including cutting as a product during preprocessing. After the pre-processing, in order to perform the cutting process as the original product, a preset set length (fixed) for obtaining the product is output as the cutting length.

  In FIG. 4, a cutting length setting unit 41-1 includes a material remaining calculation unit 101, a cutter initial position specifying unit 102, a case specifying unit 103, a cutter circumference switching signal generating unit 104, a true mark presence / absence determining unit (correction set value switching). Signal generation means) 105 and cutting length selection means 106. Hereinafter, these means will be described in detail.

First, the cutting length output by the cutting length setting unit 41-1 between the start of operation and the cutting processing as the original product will be described. There are the following three cutting lengths output by the cutting length setting unit 41-1.
(1) Set length (fixed) This is the cut length of the product when the material 1 is cut to obtain the product.
(2) Cutter circumferential length: This is the cutting length corresponding to the circumference of the rotary cutter 2.
(3) Corrected set length: This is a cutting length corrected so that the set length (fixed) can be cut at the true mark position. The corrected set length is used for the cutting process before the true mark under a predetermined condition.
The cutting length setting unit 41-1 outputs any of the cutting lengths (1) to (3) described above to the first calculation unit 42. The first calculation unit 42 receives the cutting length, and uses the input cutting length for calculation for performing the next cutting process at the timing when the cutting completion timing signal is input from the timing signal generation unit 44. Then, the cutting length setting unit 41-1 updates the cutting length to a new cutting length immediately after the first calculation unit 42 starts the calculation of the next cutting process. Although a product can be obtained by cutting in the case of (1), a product cannot be obtained by cutting in the cases of (2) and (3), and the cut material 1 becomes a waste material.

  FIG. 5 is a diagram for explaining the cutting length set by the cutting length setting unit 41-1 shown in FIG. This figure shows the transition of the cutting length during preprocessing. As illustrated in FIG. 5, the cutting length setting unit 41-1 switches and outputs the cutting length for cutting the material 1 at a predetermined timing according to the cutting patterns of the four cases 1 to 4. The distance (sensor distance) between the mark sensor 11 and the rotary cutter 2 (position where the cutting of the material 1 in the rotary cutter 2 is started) is 2000 mm, and the cutter circumferential length is 687.1 mm.

  Case 1 is a case where the set length (fixed) for cutting the material 1 to obtain a product is 990 mm. When the operation starts and the initial positioning of the rotary cutter 2 is started, the cutting length setting unit 41-1 outputs a set length (fixed) of 990 mm as a cutting length. After the initial positioning of the rotary cutter 2 is completed, the material 1 travels and the rotary cutter 2 rotates, so that the material 1 is first cut into a length (NG) of 30 mm. The cutting length setting unit 41-1 outputs the set length (fixed) 900 mm as the cutting length before inputting the cutting completion signal. Therefore, in the cutting processing after inputting the cutting completion signal, the material 1 is It is cut to a length (OK) as a 900 mm product. Then, before inputting the cutting completion signal, the corrected set length 980 mm is output as the cutting length, and when the cutting completion signal is input, the material 1 is cut to a length (NG) of 980 mm at the true marker position. . Here, when it is OK, it is a product, and when it is NG, it is a waste material.

  Case 2 is a case where the set length (fixed) for cutting the material 1 to obtain a product is 720 mm. When the operation starts and the initial positioning of the rotary cutter 2 is started, the cutting length setting unit 41-1 outputs a set length (fixed) of 720 mm as the cutting length. After the initial positioning of the rotary cutter 2 is completed, the material 1 travels and the rotary cutter 2 rotates, so that the material 1 is first cut into a length (NG) of 560 mm. The cutting length setting unit 41-1 outputs the set length (fixed) 720 mm as the cutting length before inputting the cutting completion signal. Therefore, in the cutting process after inputting the cutting completion signal, the material 1 is It is cut to a length (OK) as a product of 720 mm. Then, before inputting the cutting completion signal, the set length (fixed) 720 mm is output as the cutting length, and when the cutting completion signal is input, the material 1 becomes the length (OK) as a product of 720 mm at the true marker position. Disconnected.

  Case 3 is a case where the set length (fixed) for cutting the material 1 to obtain a product is 670 mm. When the operation starts and the initial positioning of the rotary cutter 2 is started, the cutting length setting unit 41-1 outputs a cutter circumferential length of 687.1 mm as a cutting length. After the initial positioning of the rotary cutter 2 is completed, the material 1 travels and the rotary cutter 2 rotates, so that the material 1 is first cut into a length (NG) of 30 mm. The cutting length setting unit 41-1 outputs the cutter circumferential length 687.1 mm as the cutting length before inputting the cutting completion signal. Therefore, in the cutting process after inputting the cutting completion signal, the material 1 is It is cut to a length of 687.1 mm (NG). Before the cutting completion signal is input, the set length (fixed) 670 mm is output as the cutting length, and in the cutting processing after the cutting completion signal is input, the material 1 has a length (OK) as a product of 670 mm. Disconnected. Then, before inputting the cutting completion signal, the corrected set length 612.9 mm is output as the cutting length, and in the cutting processing after inputting the cutting completion signal, the material 1 is 612.9 mm at the true marker position. Cut to length (NG).

  Case 4 is a case where the set length (fixed) for cutting the material 1 to obtain a product is 1100 mm. When the operation starts and the initial positioning of the rotary cutter 2 is started, the cutting length setting unit 41-1 outputs a cutter circumferential length of 687.1 mm as a cutting length. After the initial positioning of the rotary cutter 2 is completed, the material 1 travels and the rotary cutter 2 rotates, so that the material 1 is first cut into a length (NG) of 212.9 mm. The cutting length setting unit 41-1 outputs the cutter circumferential length 687.1 mm as the cutting length before inputting the cutting completion signal. Therefore, in the cutting process after inputting the cutting completion signal, the material 1 is It is cut to a length of 687.1 mm (NG). Then, before inputting the cutting completion signal, the set length (fixed) 1100 mm is output as the cutting length, and when the cutting completion signal is input, the material 1 is cut to a length (OK) as a product of 1100 mm.

  As described above, as the cutting length used for the first cutting process immediately after the start of operation, the set length (fixed) is selected in the case of cases 1 and 2, and the cutter circumference is selected in cases 3 and 4. However, the material 1 is cut to a length depending on the position of the blade by the initial positioning of the rotary cutter 2. Thereafter, at the timing of cutting completion, the first calculation unit 42 uses the cutting length output from the cutting length setting unit 41-1 for the calculation of the next cutting process. Immediately thereafter, the cutting length setting unit 41-1 updates the cutting length.

  Next, each means of the cutting length setting unit 41-1 will be described. Returning to FIG. 4, the remaining material calculation unit 101 inputs the set length (fixed) and the sensor distance, calculates the remaining material length, and outputs this remaining material to the cutter initial position specifying unit 102 and the case specifying unit 103. . FIG. 8 is a flowchart showing the processing of the material remaining calculation unit 101. As shown in FIG. 8, the material remaining calculation unit 101 performs multiplication and division (step S81), integer calculation (step S82), multiplication and division (step S83), and subtraction (step S84), respectively. Calculate the length.

  Returning to FIG. 4, the case specifying unit 103 inputs the material remaining length from the material remaining calculating unit 101, and uses the preset minimum acceleration distance, work angle limit distance, and cutter perimeter to perform a cutting pattern by comparison processing. The specified case number is output to the cutter circumference switching signal generating unit 104 and the cutter initial position specifying unit 102. The cutter initial position specifying means 102 inputs the material remaining length from the material remaining calculating means 101 and the case number from the case specifying means 103, specifies the cutter initial angle position, and outputs a positioning start signal and a cutter positioning signal.

  FIG. 6 is a diagram for explaining cases 1 to 4 specified by the case specifying unit 103. FIG. 7 is a flowchart showing the processing of the case specifying unit 103. In FIG. 6, the origin C is 0 degree, the minimum angle acceleration position A is +30.718 degrees, the cutting start position B is +15 degrees, the cutting completion position D is -15 degrees, and the work angle limit position E is -30.718 degrees. The rotary cutter 2 rotates in the opposite direction to the watch. Here, the minimum acceleration angle position A is a minimum initial position necessary for cutting the material 1 with the rotary cutter 2. When the blade of the rotary cutter 2 is initially positioned closer to the cutting start position B than the minimum acceleration angle position A, the rotary cutter 2 cannot obtain a sufficient speed for cutting and jams up. Therefore, an appropriate cutting process cannot be performed. The cutting start position B and the cutting completion position D are positions that mean that the material 1 is being cut when a blade exists between them. When the blade is present at the cutting completion position D, a detection signal is output by the cutting completion sensor 10 shown in FIG. The work angle limit position E is a position corresponding to the minimum acceleration angle position A.

  Further, the minimum acceleration angle is an angle of 15.718 degrees between the minimum acceleration angle position A and the cutting start position B in the opposite direction to the clock, and the minimum acceleration distance corresponding to the angle is 30 mm (FIG. 6). (Distance between thick arrows in (1)). The work angle limit angle is 314.2 degrees between the cutting start position B and the work angle limit position E in the same direction as the watch, and the work angle limit distance corresponding to the angle is 599.8 mm. Yes (FIG. 6 (2) distance between thick dotted line and thick solid line arrows). The cutter circumferential angle + minimum acceleration angle is an angle of 375.718 degrees from the cutting start position B to the minimum acceleration angle position A in the same direction as the clock, and the cutter corresponding to that angle. The peripheral length + minimum acceleration distance is 717.1 mm (FIG. 6 (3), the distance between the thick dotted line and thick solid line arrows).

In FIG. 7, the case specifying unit 103 compares the remaining material length with the minimum acceleration distance of 30 mm (step S <b> 71), and specifies the case 1 when the remaining material length is equal to or less than the minimum acceleration distance. In FIG. 6 (1), when the set length (fixed) = 990 mm, the remaining material length is 20 mm according to the following formula, so this is a value within the range indicated by the thick solid line starting from the cutting start position B. Means Case 1. The sensor distance is 2000 mm (see FIG. 5).
2000-2 × 990 = 20mm
In this case, the cutter initial position specifying unit 102 applies a limit by regarding the remaining material length of 20 mm as 30 mm so that the blade of the rotary cutter 2 is positioned at +30.718 degrees of the minimum acceleration angle position A with respect to the origin C. In addition, a cutter positioning signal is output.

Further, the case specifying means 103 compares the remaining material length with the work angle limit distance 599.8 mm (step S72), and specifies the case 2 when the remaining material length is equal to or less than the work angle limit distance. In FIG. 6 (2), when the set length (fixed) = 720 mm, the remaining material length is 560 mm according to the following formula, so this is a value within the range indicated by the thick solid line starting from the cutting start position B. Means Case 2.
2000-2 × 720 = 560mm
In this case, the cutter initial position specifying means 102 outputs a cutter positioning signal so that the blade of the rotary cutter 2 is positioned at −51 degrees with respect to the origin C, which is an angle corresponding to the remaining material length of 560 mm. .

The case specifying means 103 compares the remaining material length with the cutter circumferential length + minimum acceleration distance = 717.1 mm (step S73). When the remaining material length is equal to or less than the cutter circumferential length + minimum acceleration distance, 3 is specified. In FIG. 6 (3), when the set length (fixed) = 670 mm, the remaining material length is 660 mm according to the following formula. Therefore, this is a value within the range indicated by the thick solid line starting from the cutting start position B. Means Case 3.
2000-2 × 670 = 660mm
In this case, since the angle position corresponding to the remaining material length 660 mm is the angle position between the work angle limit position E and the minimum acceleration angle position A in the same direction as the watch, the cutter initial position specifying means 102 sets the limit. The cutter positioning signal is output so that the blade of the rotary cutter 2 is positioned at +30.718 degrees of the minimum acceleration angle position A with respect to the origin C.

Further, the case specifying means 103 specifies that the case 4 is in the case where the remaining material length is larger than the cutter circumferential length + the minimum acceleration distance 717.1 mm. In FIG. 6 (4), when the set length (fixed) = 1100 mm, the remaining material length is 900 mm according to the following formula, so this is a value within the range indicated by the thick solid line starting from the cutting start position B. Means Case 4.
2000-1 × 1100 = 900mm
In this case, the cutter initial position specifying means 102 determines that the blade of the rotary cutter 2 has an angle corresponding to 212.9 mm obtained by subtracting the cutter circumferential length 687.1 mm from the remaining material length 900 mm, and +126.9 with respect to the origin C. A cutter positioning signal is output so that it can be positioned each time.

  FIG. 9 is a flowchart showing processing of the cutter initial position specifying unit 102 and the case specifying unit 103. As shown in FIG. 9, the cutter initial position specifying unit 102 and the case specifying unit 103 perform multiplication and division (step S91), subtraction (step S92), comparison processing (step S93), switch processing (step S94), limit processing. (Step S95), addition (Step S96), inversion processing (Step S97), and addition (Step S98) are performed, and the cutter initial position specifying means 102 generates a clockwise positioning pulse signal and a counterclockwise positioning pulse signal. To do. Further, in FIG. 6, the cutter initial position specifying means 102 rotates the rotary cutter 2 so that the blade of the rotary cutter 2 does not pass between the minimum acceleration angle position A and the work angle limit position E in the counterclockwise direction. The direction is specified, and a clockwise positioning pulse signal or a counterclockwise positioning pulse signal is output as a cutter positioning signal.

  In step 93, the pulse number converted value of the material remaining length calculated in step 91 is compared with the pulse number converted value of the work angle limit distance (the process of step 72 shown in FIG. 7 is performed), and the material remaining is the workpiece. When the angle limit distance is exceeded, that is, in case 3 or 4, the signal (GT) of case 3 or 4 is output.

  In step 95, the converted number of positioning pulses is limited by these numerical values when the converted number of pulses for the work angle limit distance is the upper limit and the converted number of pulses for the minimum acceleration distance is the lower limit. Further, in step 96, the calculation of the value converted into the number of positioning pulses up to step 95 is performed based on the cutting start position B of the rotary cutter 2, whereas the cutter positioning for performing the angular positioning of the rotary cutter 2 is performed. Since the signal is based on the origin C, the number of pulses corresponding to the correction is added.

  Returning to FIG. 4, the cutter circumference switching signal generation means 104 receives a cutting completion signal from the cutting completion detection circuit 43, a case number from the case identification means 103, and a positioning start signal from the cutter initial position identification means 102. Then, a cutter circumference switching signal is generated and output to the cutting length selection means 106. With this signal, the cutting length selection means 106 selects the cutter circumferential length as the cutting length.

  FIG. 10 is a flowchart showing the processing of the cutter circumference switching signal generation means 104. As shown in FIG. 10, the cutter circumference switching signal generation means 104 performs a logical product operation (step S101) and a latch process (step S102), and generates a cutter circumference switching signal. Specifically, the cutter circumference switching signal generator 104 latches and turns on the cutter circumference switching signal when the case number 3 or 4 (3 or 4) signal or the positioning start signal is input. When a cutting completion signal is input, the cutter circumference switching signal is unlatched and turned off.

  Returning to FIG. 4, the true mark presence / absence determination means 105 inputs a cutting completion signal from the cutting completion detection circuit 43 and a mark detection signal from the mark detection circuit 54, and determines the true mark position after the operation is started. Then, tracking is performed by the amount of movement of the material 1 calculated from the pulse signal of the length measuring roll 8, and the distance between the true mark position and the rotary cutter 2 (true mark tracking distance) is obtained. Then, at the input timing of the cutting completion signal, the set length (fixed) is compared with the tracking distance of the true mark position, and a value obtained by adding the set length (fixed) and a preset allowable range (for example, 10 mm) is obtained. If the tracking distance of the true mark position is shorter, a true mark presence signal (correction set value switching signal) is output (true mark presence signal is turned on). In other cases, a true mark presence signal is output (the true mark presence signal is turned off). In this way, in the case 1, the true mark presence / absence determination means 105 calculates the cutting process according to the cutting length input by the first calculation unit 42 at the timing of the completion of the second cutting. At the timing after starting (), a true mark presence signal is output. In the case 3, a true mark present signal is given at the timing of the third cutting completion (at the timing after the first calculation unit 42 starts the calculation of the cutting process with the input cutting length at the timing of the cutting completion). Is output. Based on the signal, the cut length selection means 106 selects the corrected set value as the cut length.

  The cutting length selection means 106 receives the cutter circumference switching signal from the cutter circumference switching signal generation means 104 and the true mark presence signal from the true mark presence / absence judgment means 105, and sets the set length (fixed), cutter circumference and correction. One of the set lengths is selected as a cutting length and output. Here, the set length (fixed) is a value preset for each product, and the cutter circumference is also a preset value. The corrected set length is a value used in cases 1 and 3 described above. In case 1, the cut length selection means 106 subtracts the material remaining from the minimum acceleration distance to obtain a correction value, and sets the set length. The correction value is subtracted from (fixed), and the result is set as a corrected set value. In case 3, the remaining material is subtracted from the addition result of the cutter circumference and the minimum acceleration distance to obtain a correction value, and the correction value is subtracted from the set length (fixed), and the result is set as a corrected set value. .

  In the case 1 shown in FIG. 5, the cutting length selection means 106 subtracts the remaining material 20 mm from the minimum acceleration distance 30 mm to obtain a correction value 10 mm. Then, the correction value 10 mm is subtracted from the set length (fixed) 990 mm to obtain a corrected set value 980 mm. In the case 3 shown in FIG. 5, the cutting length selection means 106 subtracts the remaining material of 660 mm from the cutter circumferential length + minimum acceleration distance 717.1 mm to obtain a correction value of 57.1 mm. Then, the correction value 57.1 mm is subtracted from the set length (fixed) 670 mm to obtain a corrected set value 612.9 mm.

  FIG. 11 is a flowchart showing the processing of the cutting length selection means 106. As shown in FIG. 11, the cutting length selection unit 106 performs two switch processes (steps S111 and S112), and selects a cutting length. In FIG. 11, the memory is not shown, and the timing at which the cutting length is output is not shown. In step 111, the cutting length selection means 106 selects the cutter circumferential length when the cutter circumferential length switching signal is input (when ON), and when the cutter circumferential length switching signal is not input (when OFF). ) Select the set length (fixed). In step 112, the cutting length selection means 106 selects the cutter circumferential length or the set length (fixed) selected in step 111 when a true mark presence signal is input (when ON), and the true length is set. Selects the corrected set length when there is no signal with a mark (when it is off). That is, when the cutter circumference switching signal and the true mark signal are off, the set length (fixed) is selected. When the cutter circumference switching signal is on and the true mark signal is off, the cutter circumference is selected, and the cutter circumference is selected. A corrected set length is selected when the length switching signal is off and the true mark signal is on.

  As described above, according to the rotary cutter control device 100-1 according to the embodiment of the present invention, when performing pre-processing for obtaining a short waste material before performing cutting processing for obtaining a product. The cutting length setting unit 41-1 sets one of a setting length (fixed) for obtaining a product, a cutter circumferential length, and a corrected setting length as a cutting length. In this case, if the set length (fixed) is set as the cutting length, a product can be obtained even in the pre-processing. Thereby, since waste materials can be reduced in the pretreatment, an efficient and effective cutting process of the material 1 can be realized, and waste of the material can be reduced.

It is the schematic which shows the whole control object containing a rotary cutter control apparatus. It is a block diagram which shows the structure of the conventional rotary cutter control apparatus. It is a block diagram which shows the structure of the rotary cutter control apparatus by embodiment of this invention. It is a block diagram which shows the structure of the cutting length setting part in the rotary cutter control apparatus of FIG. It is a figure explaining the cutting length set by the cutting length setting part of FIG. It is a figure explaining cases 1-4. It is a flowchart figure which shows the process of a case specific means. It is a flowchart figure which shows the process of a material remaining calculation means. It is a flowchart figure which shows the process of a cutter initial position specific | specification means and a case specific means. It is a flowchart figure which shows the process of a cutter circumference switching signal production | generation means. It is a flowchart figure which shows the process of a cutting length selection means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet-like material 2 Rotary cutter 3 Main shaft 4 Reduction gear 5 Electric motor 6 Pulse generator 7 Drive control circuit 8 Measuring roll 9 Pulse generator 10 Cutting completion sensor 11 Mark sensor 40 Standard cutting circuit part 41 Cutting length setting part 42 1st Calculation unit 43 Cutting completion detection circuit 44 Timing signal generation unit 45 Perimeter setting unit 46 Seat travel distance detection circuit 47 Motor rotation speed detection circuit 48 Second calculation unit 49, 63 D / A converter 50, 64 Function generator 51 F / V converter 52 Operational amplifier 53 Second comparison unit 54 Mark detection circuit 60 Stop distance setting unit 61 Stop distance setting unit 62 Reversible counter 65 First comparison unit 100 Rotary cutter control device 101 Material remaining calculation unit 102 Initial cutter position specifying unit 103 Case identification means 104 Cutter circumference switching signal generation means 105 Mark presence determining means 106 cut length selection means

Claims (2)

In the rotary cutter control device that causes the material to travel toward the rotary cutter and causes the rotary cutter to cut the material with a preset set length as a cutting length to obtain a product,
With the set length to obtain the product for the length of material in the pretreatment where the cutting is performed as the product between the starting position of the material where the cutting is performed as the product and the cutting position of the material in the rotary cutter. Material remaining calculation means for calculating the material remaining length when cut,
Based on the remaining material length, the circumferential length of the rotary cutter, the minimum acceleration distance required for the rotary cutter to cut the material, and the work angle limit distance corresponding to the position for obtaining the minimum acceleration distance, the pretreatment A case identification means for identifying a case of a cutting pattern for a material of a length in
Cutter initial position specifying means for specifying the initial position of the rotary cutter when starting operation and outputting a positioning signal for positioning to the initial position according to the case of the remaining material length and the cutting pattern;
The set length for obtaining the product is the first set length, the circumference of the rotary cutter is the second set length, and the set length corrected by the initial position of the rotary cutter or the circumference and minimum of the rotary cutter Cutting length selection means for selecting one of these set lengths as a cutting length and outputting the cutting length when the set length corrected by the distance obtained by adding the acceleration distance is the third set length And
The rotary cutter is positioned at the initial position by the positioning signal output by the cutter initial position specifying means, and the rotary cutter is made to cut the material so as to have the cutting length output by the cutting length selecting means. Rotary cutter control device. In the rotary cutter control device according to claim 1,
Furthermore, for the case where the material remaining length specified by the case specifying means is longer than the work angle limit distance, a cutter peripheral length switching signal generating means for generating and outputting a cutter peripheral length switching signal;
The setting length for obtaining the product is compared with the tracking distance between the starting position when tracking the starting position of the material to be cut as the product and the cutting position of the material in the rotary cutter, and the setting A correction setting value switching signal generating means for generating and outputting a correction setting value switching signal when the tracking distance is smaller than the length;
The cutting length selection means selects the cutter circumferential length as the cutting length when the cutter circumferential length switching signal is input, and selects the corrected set value as the cutting length when the correction setting value switching signal is input. A rotary cutter control device.

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