JP4205541B2 - Resin sheet conveying apparatus and resin sheet conveying method - Google Patents

Description

  The present invention relates to a resin sheet conveying apparatus and a resin sheet conveying method, and relates to a resin sheet conveying apparatus and a resin sheet conveying method for positioning a printing pattern to be molded with respect to a molding position.

This type of resin sheet conveying device is printed with marks printed at equal intervals set on the conveying device, and a continuous resin sheet with a printed pattern corresponding to the marks is equally spaced by driving a servo motor device. Each length is intermittently conveyed according to the molding operation of the molding apparatus. At this time, the conveyance is started at a low speed, and when the mark of the print pattern to be formed is detected by the sensor, the rotation speed of the servo motor device is increased by a command from the control device, and the conveyance is performed at a high speed. Here, the resin sheet is conveyed at an equal interval length at this high speed and stopped, and the molding apparatus performs a molding operation. In such a case, the control device counts the pulses generated from the encoder of the servo motor device from the time when the mark is detected by the counter, and the servo motor device monitors this counter and is operated and commanded by the control device. The resin sheet is transported by driving up to the number of pulses corresponding to the equal interval length. Thereby, the printed pattern on the resin sheet is positioned at the molding position of the molding apparatus (for example, refer to Patent Document 1).
Japanese Patent No. 3183336

  In the conventional resin sheet conveying apparatus described above, the initial setting of alignment with respect to the forming position of the printed pattern on the resin sheet has to be performed by adjusting the sensor arrangement position, and thus the operation is complicated.

  The present invention has been made in view of the above problems, and an object thereof is to provide a resin sheet conveying apparatus and a resin sheet conveying method capable of performing alignment with a molding position of a printed pattern on a resin sheet by a simple method. To do.

In order to achieve the above object, the invention according to claim 1 is directed to a molding apparatus for forming a continuous resin sheet on which marks are printed at substantially equal intervals and a printed pattern is attached corresponding to the marks. And a mark detection unit for detecting a mark corresponding to a printing pattern to be molded and a color of the mark, and a printing pattern to be molded after the detection of the mark. Positioning sheet length setting means for setting the positioning sheet length to be positioned at the molding position, and resin sheet conveyance for intermittently conveying the resin sheet to the molding apparatus according to the molding operation for the printing pattern in the molding apparatus And when the mark is detected by the mark detection means during conveyance by the resin sheet conveyance means, the set positioning sheet In it is constituted comprising a conveyance control means for stopping the conveying in after it conveyed the length multiplied by the conversion factor corresponding to the color of the mark.

In the invention according to claim 1 configured as described above, a continuous resin sheet on which marks are printed at substantially equal intervals and a printed pattern is attached corresponding to the marks is formed on the basis of the marks. Provided is a resin sheet conveying device that conveys the resin. At this time, first, a mark corresponding to the print pattern to be formed and the color of the mark are detected by the mark detection means. Here, in the present invention, the positioning sheet length setting means sets the positioning sheet length for positioning the printing pattern to be molded at a predetermined molding position in the molding apparatus after the mark is detected. At this time, when the resin sheet conveying means intermittently conveys the resin sheet to the molding apparatus according to the molding operation for the printing pattern in the molding apparatus, the conveyance control means detects the mark by the mark detection means. Then, after the length obtained by multiplying the positioning sheet length set by the positioning sheet setting means by the conversion rate corresponding to the color of the mark is conveyed, the conveyance to the molding apparatus is stopped.

  According to a second aspect of the present invention, in the resin sheet conveying apparatus according to the first aspect, a speed pattern when the conveying control unit conveys the positioning sheet length with respect to a plurality of positioning sheet lengths and stops. The conveyance control unit determines a speed pattern corresponding to the set positioning sheet length based on the correspondence table, and has a table storage unit that stores a correspondence table corresponding to each other. The conveyance is stopped after conveying the same positioning sheet length according to the pattern.

  In the invention according to claim 2 configured as described above, a plurality of positioning sheet lengths are made to the table storage means, and a speed pattern when the conveyance control means conveys the positioning sheet length and stops is set to each positioning sheet length. Correspondence relations corresponding to are stored in advance. The conveyance control means determines a speed pattern corresponding to the set positioning sheet length based on the correspondence table, and stops conveyance while conveying the positioning sheet length according to the determined speed pattern.

  Furthermore, the invention according to claim 3 is the resin sheet transport apparatus according to any one of claims 1 and 2, wherein the transport control means is a first preset that does not detect the mark from the start of transport. The sheet length section is transported at a high speed, and the second sheet length section in which the mark can be detected is transported at a low speed lower than the preset high speed.

  In the invention according to claim 3 configured as described above, when the conveyance control unit controls conveyance of the resin sheet conveyance unit, the first sheet length section in which no mark is detected from the conveyance start is set at a high speed set in advance. Transport. In addition, the second sheet length section in which the mark can be detected is conveyed at a low speed that is lower than a preset high speed.

  Furthermore, the invention according to claim 4 is the resin sheet transport apparatus according to claim 3, wherein the transport control means can control transport of the first sheet length section at a plurality of high speeds with different speeds. In addition, when the length of the set first sheet length section is relatively long, the speed is increased at a high speed, and when the set first sheet length section is relatively short, the speed is increased. It is configured to convey at a low high speed.

  In the invention according to claim 4 configured as described above, the conveyance control means can control the first sheet length section at a plurality of high speeds having different speeds when performing conveyance control of the resin sheet conveyance means. At this time, when the length of the set first sheet length section is relatively long, the transport control unit transports the sheet at a high speed with a high speed, and the set first sheet length section is relatively short. In such a case, it is transported at a high speed with a low speed.

  Furthermore, the invention according to claim 5 is the resin sheet conveying apparatus according to any one of claims 1 to 4, wherein the mark is configured by a plurality of colors, and the positioning sheet length setting means is The positioning sheet length can be set for each color, and the mark detection means has mark color determination means for determining the color of the mark when detecting the mark, and the transport control means After the positioning sheet length set corresponding to the determined mark color is conveyed, the conveyance is stopped.

  In the invention according to claim 5 configured as described above, it is assumed that the mark attached to the resin sheet is configured with a plurality of colors. At this time, the positioning sheet length setting means can set the positioning sheet length for each color. The mark detection means is provided with mark color determination means for determining the color of the mark when detecting the mark. Then, the conveyance control unit stops the conveyance after conveying the positioning sheet length set corresponding to the determined mark color.

  As described above, the method of conveying a continuous resin sheet on which marks are printed at substantially equal intervals and having a printed pattern corresponding to the marks to the molding apparatus based on the marks is not a substantial resin sheet. It is not necessary to be limited to the conveying device, and it can be easily understood that it functions as the method.

For this reason, the invention according to claim 6 is a resin in which a mark is printed at substantially equal intervals and a continuous resin sheet having a printed pattern corresponding to the mark is conveyed to a molding apparatus based on the mark. A sheet conveying method comprising: a mark detection step for detecting a mark corresponding to a printing pattern to be formed and a color of the mark; and the printing pattern to be formed after the mark is detected at a predetermined forming position in the forming apparatus. A positioning sheet length setting step for setting a positioning sheet length for positioning, a resin sheet conveying step for intermittently conveying the resin sheet to the molding device in accordance with a molding operation for the printing pattern in the molding device, and the above If during transport by the resin sheet conveying step by the mark detecting means the mark is detected, the mark positioning sheet length that is the stored It is constituted comprising a conveyance control step of stopping the transportation based on the length multiplied by the conversion ratio corresponding to the color.
That is, it is not necessarily limited to a substantial resin sheet conveying apparatus, and there is no difference in being effective as a resin sheet conveying method.

As described above, the present invention can provide a resin sheet conveying apparatus that can eliminate variations in timing for detecting marks .
Further, according to the invention of claim 2, since it becomes possible to change the speed pattern up to the conveyance stop according to the positioning sheet length, for example, the time until the conveyance stop when the positioning sheet length is short, When the positioning sheet length is long, the time until the conveyance stops can be made substantially constant.
Further, according to the invention of claim 3, the conveyance time can be shortened by conveying the first sheet length section at a high speed, and the second sheet length section is conveyed at a low speed. This makes it possible to improve the mark detection accuracy.

Furthermore, according to the fourth aspect of the present invention, the conveyance speed can be appropriately varied according to the sheet length of the first sheet length section.
Further, according to the invention of claim 5, since the positioning sheet length can be changed according to the color of the mark having different detection sensitivity, it is possible to further improve the positioning accuracy.
Furthermore, according to the invention concerning Claim 6, the resin sheet conveyance method which can eliminate the dispersion | variation in the timing which detects a mark can be provided.

Here, embodiments of the present invention will be described in the following order.
(1) Configuration of resin sheet conveying apparatus:
(2) Processing contents of transfer control processing:
(3) Modification:
(4) Summary:

(1) Configuration of resin sheet conveying apparatus:
FIG. 1 is a configuration diagram showing a schematic configuration of a thermoforming apparatus to which a resin sheet conveying apparatus according to the present invention is applied. In the figure, a resin sheet conveying apparatus 1 spans an endless clamp chain 3 on sprockets 2 that are appropriately arranged on both sides of a machine frame (not shown), and is coaxial with the sprocket 2 at the front end in the traveling direction of the clamp chain 3. A fixed pulley 4 and an output shaft side of a servo motor device 5 having an encoder 6 are connected by a timing belt 7. Here, as shown in FIG. 2, the resin sheet S conveyed by the resin sheet conveying apparatus 1 has a printed pattern D printed at a plurality of shots at almost equal intervals and a printed pattern D. It is a continuous resin sheet S having detection marks m attached correspondingly, and is rotatably supported by the above-described machine frame.

  The resin sheet S is intermittently conveyed by a predetermined length for each shot to a molding apparatus 8 composed of an upper mold and a lower mold while the side edges of the resin sheet S are clamped by the clamp chain 3. The encoder 6 is directly connected to the output shaft of the servo motor device 5, and the pulse signal generated by the encoder 6 is input to the servo motor controller 10. At this time, in order to detect the mark m on the resin sheet S, a non-contact sensor 20 connected to the sensor controller 21 is disposed at a predetermined position near the molding device 8 or the molding device 8. The control device 30 inputs signals from the servo controller 10 and the sensor controller 21 and outputs a command for rotating the servo motor device 5 in accordance with various molding conditions based on the input signals.

(2) Processing contents of transfer control processing:
FIG. 3 is a schematic diagram schematically showing a speed pattern when the conveyance control process executed by the control device 30 is executed. In the figure, the resin sheet S set in the resin sheet conveying device 1 is conveyed to the molding device 8 by the illustrated speed pattern by the drive control of the servo motor device 5 by the control device 30. In such a case, at the start of conveyance, the resin sheet S is started to be fed at a high speed V1. Here, at the high speed V1, the resin sheet S having the conveying sheet length L1 is fed into the molding apparatus 8. At this time, when the time t1 has elapsed from the start of conveyance (time t1 indicates the time when the feeding of the conveyance sheet length L1 is completed), the rotation speed of the servo motor device 5 is reduced by a command from the control device 30, and the high speed V1 is reached. It is switched to a relatively low speed V2.

  When the mark m attached to the resin sheet S is detected by the sensor 20 via the sensor controller 21 while the resin sheet S is being sent at the low speed V2 (time t2), the control device 30 receives a pulse generated from the encoder 6 from the point X1 when the mark m is detected, and counts this pulse by a counter provided in the control device 30. Then, when the number of pulses corresponding to the positioning sheet length L2 is counted, the control device 30 outputs a conveyance stop command to the servo motor device 5. The servo motor device 5 stops the conveyance of the resin sheet S when the stop command is input.

  That is, the servo motor device 5 is driven until the number of pulses corresponding to the positioning sheet length L2 is reached after the mark m is detected. And in the whole thermoforming apparatus, after conveyance of the resin sheet S in this way, while conveyance of the resin sheet S with respect to the shaping | molding apparatus 8 is stopped, it shape | molds and heats by the shaping | molding apparatus 8, the heating apparatus which is not shown in figure, and a trimming apparatus. When a known processing such as trimming is performed and the stop time elapses, the resin sheet S is again fed at the high speed V1, and the series of feeding operations are sequentially repeated.

  In the present embodiment, the above-described conveying sheet length L1 and positioning sheet length L2 are defined in advance and stored as data. FIG. 4 is a configuration diagram showing a data configuration of a sheet length data table TBL1 that stores the conveying sheet length L1 and the positioning sheet length L2. In the drawing, a sheet length data table TBL1 is stored in a predetermined storage area M, “L1” is stored corresponding to “conveying sheet length”, and “L2” is stored corresponding to “positioning sheet length”. Is stored. In the present embodiment, the conveying sheet length L1 and the positioning sheet length L2 are set on an operation panel (not shown) and are stored in the sheet length data table TBL1.

  FIG. 5 is a screen configuration diagram showing a screen configuration of a display screen displayed on a liquid crystal monitor of an operation panel (not shown) when setting the conveying sheet length L1 and the positioning sheet length L2. In the figure, the display screen P includes a conveyance sheet length input field P1, a positioning sheet length input field P2, and a setting button P3. The conveyance sheet length input field P1 includes a sheet length increment button P11 and a sheet length. The decrement button P12 can input a predetermined conveying sheet length as appropriate. In the positioning sheet length input field P2, a predetermined positioning sheet length can be appropriately input by a sheet length increment button P21 and a sheet length decrement button P22. When the input is made in the input fields P1 and P2 and the setting button P3 is depressed, the input contents are stored in the sheet length data table TBL1.

  FIG. 6 is a flowchart showing the contents of the conveyance control process executed by the control device 30. In the figure, when the operation of the thermoforming apparatus is started (step S105), the resin sheet transport apparatus 1 starts intermittent transport of the resin sheet S to the molding apparatus 8 (step S110). Next, the sheet length data table TBL1 is accessed to acquire the sheet length L1 for conveyance, and conveyance is started at the high speed V1 (step S115). Then, the pulses from the encoder 6 input via the servo controller 10 are counted, and when the conveyance of the conveyance sheet length L1 acquired in step S115 is detected based on the counted pulses (step S120), the servo A deceleration command is output to the controller 10 (step S125), the servo motor 5 is switched to the low speed V2, and the resin sheet S is conveyed at the low speed V2 (step S130).

  When the mark m is detected by the sensor 20 via the sensor controller 21 during the conveyance of the resin sheet S at the low speed V2 (step S135), the sheet length data table TBL1 is accessed to obtain the positioning sheet length L2. (Step S140). The pulses from the encoder 6 input via the servo controller 10 are counted, and when the conveyance of the positioning sheet length L2 acquired in step S140 is detected based on the counted pulses (step S145), the servo controller The stop command is output to 10, and the servo controller 10 is stopped driving the servo motor 5, thereby stopping the conveyance of the resin sheet S to the molding apparatus 8 (step S150). Here, a molding operation is performed in the molding apparatus 8 (step S155). The above processing is executed until the operation of the thermoforming apparatus is completed (step S160).

(3) Modification:
In the above-described embodiment, a mode in which the positioning sheet length L2 is conveyed at a constant low speed V2 is adopted. However, the positioning sheet length L2 is variable by a setting operation on the display screen P. Therefore, the positioning sheet length L2 may be shortened or may be lengthened. At this time, if the resin sheet S is conveyed at a constant low speed V2 regardless of the length of the positioning sheet length L2, when the positioning sheet length L2 is long, the time until the conveyance stops is increased, which is the cause. The molding cycle becomes long. In this case, it is preferable that the speed pattern at the time of low-speed conveyance is changed depending on the length of the positioning sheet length L2, and the resin sheet S can be conveyed at high speed when the positioning sheet length L2 is long. Therefore, as shown in FIG. 7, a plurality of speed patterns P11, P12, and P13 are prepared in the servo controller 10 at the time of low-speed conveyance, and the speed pattern table TBL2 shown in FIG.

  In the figure, the speed pattern P11 is a pattern when the positioning sheet length is short, the speed pattern P12 is a pattern when the positioning sheet length is medium, and the speed pattern P13 is a pattern when the positioning sheet length is long. It is. Here, an example when the positioning sheet length is short is set as the positioning sheet length L21, and the speed pattern P11 is stored correspondingly, and an example when the positioning sheet length is medium is set as the positioning sheet length L22. Correspondingly, the speed pattern P12 is stored, and an example of the case where the positioning sheet length is long is set as the positioning sheet length L23, and the speed pattern P13 is stored correspondingly. Then, the control device 30 causes the servo controller 10 to select any one of the speed patterns P11 to P13 according to the positioning sheet length set on the display screen P, and use it at the time of low speed conveyance. This makes it possible to realize low-speed conveyance according to the short, medium and long lengths of the positioning sheet.

  In the above-described embodiment, the conveyance sheet length L1 is conveyed at a constant high speed V1. However, the conveyance sheet length L1 is variable by a setting operation on the display screen P. Accordingly, the conveying sheet length L1 may be shortened or may be lengthened. At this time, if the resin sheet S is transported at a constant high speed V1 regardless of the length of the transport sheet length L1, when the transport sheet length L1 is long, the time until the transport stops is increased, which is the cause. The molding cycle becomes long. In this case, it is preferable that the speed pattern during high-speed conveyance is changed depending on the length of the conveyance sheet length L1, and the resin sheet S can be conveyed at high speed when the conveyance sheet length L1 is long. Therefore, as shown in FIG. 9, a plurality of speed patterns P21, P22, and P23 are prepared in the servo controller 10 at the time of high-speed conveyance, and the speed pattern table TBL3 shown in FIG.

  In the figure, the speed pattern P21 is a pattern when the conveying sheet length is short, the speed pattern P22 is a pattern when the conveying sheet length is medium, and the speed pattern P23 is a pattern when the conveying sheet length is long. It is. Here, an example when the conveying sheet length is short is an conveying sheet length L11, and the speed pattern P21 is stored correspondingly, and an example when the conveying sheet length is medium is an conveying sheet length L12. Correspondingly, the speed pattern P22 is stored, and an example of the case where the transport sheet length is long is set as the transport sheet length L13, and the speed pattern P23 is stored correspondingly. Then, the control device 30 causes the servo controller 10 to select any one of the speed patterns P21 to P23 according to the conveying sheet length set on the display screen P, and use it at the time of high-speed conveyance. This makes it possible to realize high-speed conveyance according to the short, medium, and long lengths of the conveying sheet. In addition, by adopting a speed pattern that equalizes the timing of shifting to the low speed V2, it is possible to make the forming timing the same regardless of the length of the conveying sheet.

  Further, in the above-described embodiment, the configuration in which the positioning sheet length L2 is made constant regardless of the color of the mark m is employed. However, when the sensor 20 and the sensor controller 21 can determine the color of the mark m, The sensitivity for determining the color varies depending on the color of the mark m. That is, variations occur in the timing for detecting the mark m. At this time, when the positioning sheet length L2 set after the detection of the mark m is transported regardless of the color of the mark m, the sheet length that is transported substantially varies due to the above-described timing variation. . Therefore, the conversion rate data table TBL4 shown in FIG. In the figure, the mark color and the conversion rate of the positioning sheet length L2 are stored in association in the conversion rate data table TBL4. This conversion rate is for eliminating the above-described timing variation and making the positioning sheet length L2 constant. The conversion rates R1 and R2 are obtained according to the determined color of the mark m, and the positioning sheet is obtained. The length L2 is multiplied by this conversion rate, and the multiplication result is set as a positioning sheet length L2 used for the conveyance control process.

(4) Summary:
As described above, the positioning sheet length L2 for positioning the conveying sheet S at the molding position of the molding position 8 after the detection of the mark m can be set in advance on the display screen P. Even if the printing interval of the pattern P is changed, positioning with respect to the forming position is performed by changing the setting of the positioning sheet length L2 without changing the arrangement position of the sensor 20 for detecting the mark m. Therefore, it is possible to eliminate the troublesome work of changing the arrangement position of the sensor 20 described above.

It is the block diagram which showed the structure of the resin sheet conveying apparatus. It is the block diagram which showed the structure of the resin sheet. It is the schematic diagram which showed typically the speed pattern at the time of performing a conveyance control process. It is the block diagram which showed the data structure of the sheet length data table. It is the screen block diagram which showed the screen structure of the display screen. It is the flowchart which showed the processing content of the conveyance control processing. It is the schematic diagram which showed typically the other example of the speed pattern. It is the block diagram which showed the data structure of the speed pattern data table. It is the schematic diagram which showed typically the other example of the speed pattern. It is the block diagram which showed the data structure of the speed pattern data table. It is the block diagram which showed the other data structure of the conversion rate data table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Resin sheet conveying apparatus 2 ... Sprocket 3 ... Clamp chain 4 ... Pulley 5 ... Servo motor apparatus 6 ... Encoder 7 ... Timing belt 8 ... Molding apparatus 10 ... Servo motor controller 20 ... Sensor 21 ... Sensor controller 30 ... Control apparatus S ... Resin sheet

Claims (6)

A resin sheet conveying apparatus that conveys a continuous resin sheet printed with a mark corresponding to the mark and printed with a pattern to the molding apparatus based on the mark at substantially equal intervals,
Mark detection means for detecting the mark corresponding to the printing pattern to be molded and the color of the mark;
A positioning sheet length setting means for setting a positioning sheet length for positioning the printed pattern to be molded at a predetermined molding position in the molding apparatus after detection of the mark;
Resin sheet conveying means for intermittently conveying the resin sheet to the molding apparatus according to the molding operation for the printed pattern in the molding apparatus,
When the mark detection unit detects the mark during conveyance by the resin sheet conveyance unit, after conveying the length obtained by multiplying the set positioning sheet length by the conversion rate corresponding to the color of the mark A resin sheet conveying apparatus comprising a conveyance control means for stopping the conveyance.   The conveyance control unit has a table storage unit that stores a correspondence table corresponding to a speed pattern when the conveyance control unit conveys and stops the positioning sheet length with respect to a plurality of positioning sheet lengths. The speed pattern corresponding to the set positioning sheet length is determined based on the correspondence table, and the transport is stopped after the positioning sheet length is transported according to the determined speed pattern. The resin sheet conveying apparatus according to claim 1.   The conveyance control means conveys the preset first sheet length section in which the mark is not detected from the start of conveyance at a high speed, and sets the second sheet length section in which the mark can be detected to the preset high height. The resin sheet conveying apparatus according to claim 1, wherein the resin sheet is conveyed at a low speed lower than the speed.   The conveyance control means can control the conveyance of the first sheet length section at a plurality of high speeds with different speeds, and the speed is increased when the set length of the first sheet length section is relatively long. 4. The resin sheet conveying apparatus according to claim 3, wherein the resin sheet is conveyed at a high speed and at a high speed when the first sheet length section that is set is relatively short. .   The mark is composed of a plurality of colors, and the positioning sheet length setting means can set a positioning sheet length for each color, and the mark detection means can detect the mark when detecting the mark. Mark color discriminating means for discriminating the color of the mark, and the transport control means stops the transport after transporting the positioning sheet length set corresponding to the determined mark color. The resin sheet conveying apparatus according to any one of claims 1 to 4, wherein the resin sheet conveying apparatus is characterized. A resin sheet transport method for transporting a continuous resin sheet printed with a mark corresponding to the mark to a molding apparatus based on the mark, with marks printed at substantially equal intervals.
A mark detection step for detecting the mark corresponding to the printing pattern to be molded and the color of the mark;
A positioning sheet length setting step for setting a positioning sheet length for positioning the printed pattern to be molded at a predetermined molding position in the molding apparatus after detection of the mark;
Resin sheet conveyance step of intermittently conveying the resin sheet to the molding apparatus according to the molding operation for the printed pattern in the molding apparatus,
When the mark is detected by the mark detection means during conveyance in the resin sheet conveyance step, conveyance is performed based on a length obtained by multiplying the stored positioning sheet length by a conversion rate corresponding to the color of the mark. And a conveyance control step for stopping the resin sheet.

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