TW202340073A - Position calibration device, position calibration method and position calibration program including a calibration start signal generating unit and an end position information recording part for efficiently calibrating the position of a dancer roller - Google Patents

Abstract

The present provides a position calibration device or the like capable of efficiently calibrating the position of a dancer roller. A position calibration device (10) of a dancer roller (243) is provided, in which the dancer roller (243) is movable in the direction of thrust force to be applied, and applies tension in a direction opposite to the thrust force to a conveyed object. The position calibration device (10) includes a calibration start signal generating unit (181) for generating a calibration start signal before moving the dancer roller (243) to at least one of an upper end (243A) and a lower end (243B) of a movable range of the dancer roller (243) in the direction of the thrust force; and an end position information recording part (19) for detecting that the dancer roller (243) has been moved to at least one of the upper end (243A) and the lower end (243B), and recording the position information.

Description

Position correction device, position correction method, position correction program

The present invention relates to a position correction device of a tension adjustment roller (dancer roller), etc.

As a conveying device for conveying linear objects such as strings and steel wires, or planar objects such as paper and cloth, it is known to use tension adjustment rollers to apply tension to the objects. The tension adjustment roller in Patent Document 1 can move in the direction of the thrust force exerted by the spring, and is stationary at a position where the thrust force from the spring and the tension force from the object to be conveyed are balanced. In this way, the rest position of the tension adjustment roller indicating the tension of the object to be conveyed is measured by the position sensor.

The position of the tension adjustment roller is calibrated before use so that the position sensor can accurately measure the position of the tension adjustment roller, that is, the tension of the object to be conveyed. Specifically, the operator manually moves the tension adjustment roller to both ends of the movable area and allows the position sensor to record its position information. [Prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2003-176080

[Problem to be solved by the invention]

In the conventional correction of the position of the tension adjustment roller, the operator manually moves the tension adjustment roller to both ends of the movable area until the recording of the position information based on the position sensor is completed normally, requiring heavy tension. The adjustment roller is continuously maintained in a certain position with strong force. In order to ensure safety or calibration accuracy, there are many cases where multiple people are required to perform the work, which is not necessarily an efficient operation.

The present invention was developed in view of such a situation, and its purpose is to provide a position correction device and the like that can efficiently correct the position of the tension adjustment roller. [Technical means to solve problems]

In order to solve the above problems, one aspect of the position correction device of the present invention is a position correction device of a tension adjustment roller that can move in the direction of a thrust force and apply tension in the opposite direction to the thrust force to the conveyed object. , the position correction device includes: a correction start signal generating unit that generates a correction start signal before moving the tension adjustment roller to at least one end of the movable area of the tension adjustment roller in the direction of thrust; and an end position information recording unit that Detect that the tension adjustment roller has moved to one end and record its position information.

In this mode, the correction start signal is generated before the tension adjustment roller moves to one end of the movable area by human power, etc., and then, when the tension adjustment roller moves to one end of the movable area by human power, etc., the position information is automatically recorded, so there is no need to do the conventional work. In this way, the heavy tension adjustment roller is continuously maintained in a certain position by human power.

Another aspect of the present invention is a position correction method. This method is a position correction method of a tension adjustment roller. The tension adjustment roller can move in the direction of an applied thrust force and apply tension in the opposite direction to the thrust force to the conveyed object. The position correction method includes: a correction start signal generating step , which is to generate a correction start signal before moving the tension adjustment roller to at least one end of the movable area of the tension adjustment roller in the direction of thrust; and an end position information recording step, which is to detect that the tension adjustment roller has moved to one end and record it Location information.

In addition, any combination of the above constituent elements or any expression thereof converted into a method, device, system, recording medium, computer program, etc. are also included in the present invention. [Effects of the invention]

According to the present invention, the position of the tension adjustment roller can be corrected efficiently.

Hereinafter, modes for implementing the present invention (hereinafter also referred to as embodiments) will be described in detail with reference to the drawings. In the description and/or drawings, the same or equivalent components, members, processes, etc. are denoted by the same symbols, and repeated descriptions are omitted. The scale and shape of each part in the illustrations are set for convenience to simplify the description, and should not be interpreted restrictively unless specifically mentioned. The embodiments are only examples and do not limit the scope of the present invention in any way. All features described in the embodiments or combinations thereof are not necessarily essential to the invention.

FIG. 1 schematically shows the structure of a conveyance control device 1 that controls the conveyance operation of the conveyance device 2 that conveys the object 3 . Examples of the conveyed object 3 include linear ones such as strings and steel wires, and planar objects such as paper, cloth, film, foil, and rubber. In this embodiment, a roll-to-roll conveyance device 2 that conveys a planar base material as the conveyed object 3 in the conveyance direction (the left-right direction in FIG. 1 ) will be described. The conveying device 2 may be a device that performs any processing on the conveyed object, such as a coater or coating device that coats the conveyed object, a printer that prints the conveyed object, or a coating device that performs printing on the conveyed object. A part of a stretching device that applies tension to stretch.

The conveying device 2 includes a conveying roller group 20 and a tension adjuster (dancer) 24 . The conveyance roller group 20 is provided with a plurality of conveyance rollers as a plurality of conveyance parts for conveying the conveyed object 3 . The conveyance roller group 20 in the example of FIG. 1 has three conveyance roller pairs arranged in series along the conveyance direction of the object 3 to be conveyed. The plurality of conveyance rollers are adjacent to each other in the conveyance direction. Each conveying roller pair includes driving rollers 211 to 213 that are rotationally driven by driving portions 111 to 113 described below. The conveyed object 3 is sandwiched between the driving rollers 211 to 213 and rotates in conjunction with the driving rollers 211 to 213. The driven rollers 221 to 223. The three conveying roller pairs 211/221 to 213/223 and the three driving parts 111 to 113 and the three speed control parts 121 to 123 respectively provided in the conveying control device 1 can be mutually connected. Likewise composed. Therefore, the first conveying roller pair 211/221, the first driving part 111, and the first speed control part 121 will be described below, and the other conveying roller pairs 212/222, 213/223, other driving parts 112, 113, and The description of other speed control units 122 and 123 is repeated. In addition, the number of conveying roller pairs provided in the conveying roller group 20 may be arbitrary (any integer greater than 1).

The driving roller 211 and the driven roller 221 are conveying rollers serving as a conveying portion for conveying the conveyed object 3, and can rotate in a direction orthogonal to the conveying direction (the left-right direction in Fig. 1) (perpendicular to the paper surface of Fig. 1). direction) of the rotation axis. The drive roller 211 is rotationally driven by a drive unit 111 such as a motor based on a rotation speed command generated by the speed control unit 121 . When the conveying direction of the object 3 in FIG. 1 is rightward, the driving roller 211 is rotationally driven in the clockwise direction by the driving part 111 , and the driven roller 221 rotates counterclockwise in conjunction with the driving roller 211 . By individually rotating and driving the driving rollers 211 to 213 constituting the conveying roller group 20 using the driving units 111 to 113 of the conveying control device 1, the speed or tension of each part of the conveyed object 3 can be controlled extremely finely, so that the Optimization of processing based on the conveying operation of the conveyed object 3 by the conveying device 2 or the various devices in which the conveying device 2 is installed.

Tension adjusters are provided upstream (left side in FIG. 1 ) and downstream (right side in FIG. 1 ) of the transportation roller group 20 in the transportation direction so as to sandwich the transportation roller group 20 from both sides in the transportation direction. twenty four. The two tension adjusters 24 shown in the figure can be configured similarly to each other, so the left tension adjuster 24 will be described.

The tension adjuster 24 applies tension in the conveyance direction to the conveyed object 3 . The tension adjuster 24 is provided with a pair of rollers 241 and 242 provided on the conveyance path of the conveyed object 3 (the path in the left-right direction in which the conveyed object 3 extends in FIG. 1 ) and is provided between the pair of rollers 241 and 242 The tension adjustment roller 243 is located at a position offset from the conveyance path of the conveyed object 3 . In addition, the tension adjustment roller is also called a tension adjustment roller (dancer roll).

The tension adjustment roller 243 is provided movably between the upper end 243A and the lower end 243B in the direction perpendicular to the conveyance path of the conveyed object 3 (the up-and-down direction in FIG. 1 ). The air cylinder 244 as a thrust applying unit generates a thrust that urges or pressurizes the tension adjustment roller 243 in a direction away from the conveyance path of the object 3 (downward in FIG. 1 ). This thrust is based on the air pressure of the cylinder 244 connected to the tension adjustment roller 243 through a piston rod or connecting rod. The air pressure of the cylinder 244 is generated by the thrust control unit 17, which is composed of an electropneumatic regulator or the like that electrically controls the air pressure. Generally, a substantially constant voltage is applied to the electropneumatic regulator (thrust control unit 17), and the air pressure of the air cylinder 244, that is, the thrust of the tension adjustment roller 243 is controlled to be substantially constant. In addition, a thrust applying part that applies thrust to the tension adjustment roller 243 based on other principles may also be provided instead of the cylinder 244 (for example, a linear motor that applies thrust to the tension adjustment roller 243 based on electricity, etc.).

The tension adjustment roller 243 , which is biased or pressurized downward by the thrust force from the air cylinder 244 , applies tension to the conveyed object 3 by stretching the conveyed object 3 in a direction away from the conveying path. At this time, in the tension adjustment roller 243, the downward thrust received from the air cylinder 244 and the upward tension received from the conveyed object 3 are balanced. As described above, the downward thrust force that the tension adjustment roller 243 receives from the air cylinder 244 is generally maintained or controlled to be substantially constant. Therefore, the vertical position of the tension adjustment roller 243 indicates the tension of the conveyed object 3 . Typically, by controlling the tension of the object 3 to be conveyed, the vertical position of the tension adjustment roller 243 is controlled substantially at the center of the upper end 243A and the lower end 243B.

The position of the tension adjustment roller 243 in the thrust direction (the up-down direction in FIG. 1 ) is detected by the position detection unit 245 or a position sensor in the form of an electrical signal, and is provided to the conveyance control device 1 Subtractor 14. In addition, the position command of the tension adjustment roller 243 in the direction of the thrust generated by the position command generation unit 13 of the transportation control device 1 is input to the subtractor 14 . As described above, the position of the tension adjustment roller 243 substantially corresponds to the tension of the conveyed object 3 . Therefore, the position command of the tension adjustment roller 243 generated by the position command generating unit 13 substantially corresponds to the tension command of the conveyed object 3 . The speed control unit 15 of the conveyance control device 1 generates a speed command for reducing deviations in the position of the tension adjustment roller 243 supplied from the subtractor 14 or in the tension of the conveyed object 3 . This speed command is a command for the transport speed of the object 3 to be transported, specifically, it is a command for the rotation speed of the drive roller 251 explained below.

The drive unit 16 of the conveyance control device 1 rotates and drives the drive roller 251 arranged in parallel immediately behind the tension adjuster 24 in accordance with the speed command supplied from the speed control unit 15 . The drive roller 251 is a conveyance roller rotatable around a rotation axis orthogonal to the conveyance direction of the conveyed object 3 . When the driving roller 251 is driven to rotate in the clockwise direction in FIG. 1 , the driven roller 252 rotates in the counterclockwise direction in conjunction with the driving roller 251 . In addition, a driving roller 231 identical to the driving roller 251 and a driven roller 232 identical to the driven roller 252 are also provided immediately in front of the tension adjuster 24 . The drive roller 231 is rotationally driven by a drive unit (not shown) at a constant rotational speed, for example. On the other hand, the rotational speed of the drive roller 251 is appropriately controlled based on the deviation in position and/or tension. In this way, the driving roller 251 and the driven roller 252, while transporting the object 3 sandwiched therebetween, respond to the position command of the tension adjustment roller 243 generated by the position command generating unit 13, that is, the tension command of the object 3. The desired tension is applied to the conveyed object 3. In the example of FIG. 1 , two tension adjusters 24 are provided on the front side and the rear side of the conveyance roller group 20 in the conveyance direction, so that the inlet portion of the conveyance roller group 20 (the left end in FIG. 1 ) and the tension of the conveyed object 3 at the exit portion (right end in FIG. 1 ) is controlled to a desired value.

Before using the tension adjustment roller 243, the position is calibrated so that the position detection unit 245 can accurately measure the position of the tension adjustment roller 243, that is, the tension of the object 3 to be conveyed. Specifically, the operator manually moves the tension adjustment roller 243 to both ends of the movable area in the thrust direction (the up-and-down direction in FIG. 1 ), that is, the upper end 243A and the lower end 243B, and the position detection unit 245 detects each. Location information is recorded for correction purposes. In the conventional correction of the position of the tension adjustment roller 243, the operator manually moves the tension adjustment roller 243 to both ends 243A and 243B of the movable area until the recording of the position information based on the position detection unit 245 is completed normally. , the heavy tension adjustment roller 243 needs to be continuously maintained in a certain position with strong force. In order to ensure safety or calibration accuracy, there are many cases where multiple people are required to perform the work, which is not necessarily an efficient operation. According to the position correction device 10 of this embodiment described below, the position of the tension adjustment roller 243 can be corrected efficiently.

Figure 2 is a functional block diagram of the position correction device 10 of the tension adjustment roller 243. The position correction device 10 includes the aforementioned thrust control unit 17, a correction start signal generation unit 181, a correction end signal generation unit 182, and an end position information recording unit 19. These functional blocks are realized through the cooperation of hardware resources such as the computer's central processing unit, memory, input devices, output devices, peripheral machines connected to the computer, and the software that uses these executions. Regardless of the type of computer or the installation location, each of the above functional blocks can be implemented by the hardware resources of a single computer, or can be implemented by a combination of hardware resources dispersed in multiple computers.

The structure and function of the tension adjuster 24 in this figure are the same as those in Figure 1 , but a piston rod 246 and a connecting rod 247 are additionally shown in this figure. The piston rod 246 is connected to a piston (not shown) provided in the cylinder 244 so as to be movable in the thrust direction (the up-and-down direction in FIG. 2 ). The piston is urged upward together with the piston rod 246 by the air pressure generated by the thrust control unit 17 . In this way, an upward thrust F on the piston and piston rod 246 is generated.

The upper end of the piston rod 246 is connected to the left end of the connecting rod 247. Moreover, the right end part of the link 247 is connected to the tension adjustment roller 243. The link 247 is fixed rotatably around a fulcrum O provided substantially in the center of the link 247 in its longitudinal direction (the left-right direction in FIG. 2 ). The upward thrust F that the left end of the connecting rod 247 receives from the upper end of the piston rod 246 becomes a torque that causes the connecting rod 247 to rotate clockwise around the fulcrum O. As a result, a downward thrust in proportion to the upward thrust F at the left end is applied to the tension adjustment roller 243 connected to the right end of the link 247 .

As shown in FIG. 3 , the upper end 243A is in contact with the link 247 that rotates counterclockwise about the fulcrum O to stop it, thereby determining the upper end of the tension adjustment roller 243 in the thrust direction. As shown in FIG. 4 , the lower end 243B is in contact with the connecting rod 247 that rotates clockwise about the fulcrum O to stop it, thereby determining the lower end of the tension adjustment roller 243 in the thrust direction. Hereinafter, for the sake of convenience, the upper end of the movable area of the tension adjustment roller 243 is also referred to as the upper end 243A, and the lower end of the movable area of the tension adjustment roller 243 is also referred to as the lower end 243B.

When the position of the tension adjustment roller 243 is corrected, the correction start signal generation unit 181 generates a correction start signal before moving the tension adjustment roller 243 to at least one of the upper end 243A and the lower end 243B of the movable area in the thrust direction. In addition, when the position of the tension adjustment roller 243 is corrected, the movement of the tension adjustment roller 243 to the upper end 243A and/or the lower end 243B can be performed by the operator by manpower, or by the thrust control part 17 and the cylinder 244 in addition to manpower. The generated thrust can be used, or the thrust generated by the thrust control unit 17 and the cylinder 244 can be used instead of human power, or the piston, piston rod 246, connecting rod 247, and tension adjustment roller can be driven in the thrust direction in addition to human power. The driving force generated by at least any one of the linear motors and other driving devices in 243 is performed, or by being able to drive at least any of the piston, piston rod 246, connecting rod 247, and tension adjustment roller 243 in the thrust direction instead of human power. One is performed by the driving force generated by other driving devices such as linear motors.

As shown in FIG. 3 , when the tension adjustment roller 243 is moved in the direction opposite to the thrust force (upward in FIG. 3 ), the thrust control unit 17 decreases the amount of force supplied by the cylinder according to the correction start signal generated by the correction start signal generating unit 181 . The thrust generated by 244. For example, the thrust control unit 17 sets the thrust generated by the cylinder 244 to zero according to the correction start signal. Therefore, the force required by the operator to move the tension adjustment roller 243 to the upper end 243A is reduced, which can improve the safety and efficiency of the operation. In addition, when the thrust control unit 17 and the cylinder 244 can apply thrust in the opposite direction to the thrust F in Fig. 2 (downward in Fig. 3) to the piston and the piston rod 246, or when other driving devices such as linear motors can adjust the tension. When the roller 243 is driven to the upper end 243A, the movement of the tension adjustment roller 243 to the upper end 243A when the position of the tension adjustment roller 243 is corrected can be fully automated without requiring an operator.

As shown in FIG. 4 , when the tension adjustment roller 243 is moved in the thrust direction (downward in FIG. 4 ), the thrust control unit 17 increases the correction start signal generated by the cylinder 244 according to the correction start signal generated by the correction start signal generating unit 181 . Thrust F. Therefore, the force required by the operator to move the tension adjustment roller 243 to the lower end 243B is reduced, which improves the safety and efficiency of the operation. In addition, when the thrust control part 17 and the cylinder 244 can exert a thrust F on the piston and the piston rod 246 that can drive the tension adjustment roller 243 to the lower end 243B, or when other driving devices such as linear motors can drive the tension adjustment roller 243 to At the lower end 243B, the movement of the tension adjustment roller 243 to the lower end 243B when the position of the tension adjustment roller 243 is corrected can be fully automated without requiring an operator.

After the correction start signal generation unit 181 generates the correction start signal, the end position information recording unit 19 detects that the tension adjustment roller 243 has moved to the upper end 243A (Fig. 3) or the lower end 243B (Fig. 4), which is detected by the position detection unit 245. Each location information is recorded for correction purposes. For example, the end position information recording unit 19 records the position information of the tension adjustment roller 243 that is measured continuously or intermittently a plurality of times by the position detection unit 245 after the correction start signal generation unit 181 generates the correction start signal, which is closest to the upper end 243A ( Figure 3) or the lower end 243B (Figure 4). In addition, the end position information recording unit 19 does not need to record the position information of the upper end 243A and the lower end 243B of the tension adjustment roller 243 in real time. Instead, the position detection unit 245 can obtain a series of position information groups near the upper end 243A and the lower end 243B and temporarily store them in a buffer, etc. , and then select the one closest to the upper end 243A or the lower end 243B for recording.

The correction end signal generating unit 182 generates a correction end signal after detecting from the end position information recording unit 19 that the tension adjustment roller 243 has moved to the upper end 243A or the lower end 243B. As specifically shown in FIG. 5 described below, the position information of the tension adjustment roller 243 continuously obtained by the position detection unit 245 takes the extreme value or the maximum absolute value at the upper end 243A and the lower end 243B. Therefore, the end position information recording unit 19 It can be detected that the tension adjustment roller 243 has moved to the upper end 243A or the lower end 243B based on the change of the position information including the extreme value. Here, the end position information recording unit 19 only needs to be able to detect the extreme value of the position information of the tension adjustment roller 243. Therefore, there is no need to manually maintain the heavy tension adjustment roller 243 at a certain position (upper end 243A) as in the past. or lower end 243B), which can improve the safety and efficiency of operations.

As shown in FIG. 3 , after reducing the thrust generated by the cylinder 244 according to the correction start signal, when the correction end signal generating unit 182 generates a correction end signal, the thrust control unit 17 ends the thrust generated by the cylinder 244 based on the correction end signal. Decrease (e.g., return to the thrust before the reduction). Similarly, as shown in FIG. 4 , after increasing the thrust F generated by the cylinder 244 according to the correction start signal, when the correction end signal generating unit 182 generates a correction end signal, the thrust control unit 17 ends generation by the cylinder 244 based on the correction end signal. The thrust F increases (for example, returning to the thrust before the increase).

FIG. 5 shows the position correction process by the tension adjustment roller 243 of the position correction device 10 over time. In the initial state, the tension adjustment roller 243 is located at the "center" as shown in Figure 2, and the thrust F of the cylinder 244 is at the "normal" level. In this state, the correction start signal generating unit 181 generates an upper limit position correction start signal for starting the upper limit position correction of the tension adjustment roller 243 . The thrust control unit 17 that receives the upper limit position correction start signal reduces the thrust generated by the cylinder 244. Then, as shown in FIG. 3 , the tension adjustment roller 243 is moved to the upper end 243A by the operator's manpower or the like. At this time, as shown in the "tension adjustment roller position" in FIG. 5 , the position information of the tension adjustment roller 243 continuously obtained by the position detection unit 245 takes a maximum value or maximum value at the upper end 243A. The operator who confirms such a maximum value or maximum value on the screen or the like causes the correction end signal generating unit 182 to generate an upper limit position correction end signal for ending the upper limit position correction of the tension adjustment roller 243 . In addition, the end position information recording unit 19 that autonomously detects the maximum value or the maximum value may cause the correction end signal generating unit 182 to generate the upper limit position correction end signal without requiring an operator. Upon receiving the upper limit position correction completion signal, the thrust control unit 17 returns the thrust generated by the cylinder 244 from the "reduced" level to the "normal" level.

Next, the correction start signal generating unit 181 generates a lower limit position correction start signal for starting correction of the lower limit position of the tension adjustment roller 243 . Upon receiving the lower limit position correction start signal, the thrust control unit 17 increases the thrust generated by the cylinder 244. Then, as shown in FIG. 4 , the tension adjustment roller 243 is moved to the lower end 243B by the operator's manpower or the like. At this time, as shown in the "tension adjustment roller position" in FIG. 5 , the position information of the tension adjustment roller 243 continuously acquired by the position detection unit 245 takes a minimum value or minimum value at the lower end 243B. The operator who confirms such a minimum value or a minimum value on a screen or the like causes the correction end signal generating unit 182 to generate a lower limit position correction end signal for ending correction of the lower limit position of the tension adjustment roller 243 . In addition, the end position information recording unit 19 that autonomously detects the minimum value or the minimum value may cause the correction end signal generating unit 182 to generate a lower limit position correction end signal without requiring an operator. Upon receiving the lower limit position correction completion signal, the thrust control unit 17 returns the thrust generated by the cylinder 244 from the "increased" level to the "normal" level.

At the same time as or after the above processing, the end position information recording unit 19 searches for and selects the tension corresponding to the maximum value or the maximum value of the "tension adjustment roller position" among the position information groups continuously obtained by the position detection unit 245 The position information of the upper end 243A of the adjustment roller 243 is recorded as the upper limit position correction, and the position information group continuously obtained by the position detection unit 245 is searched and selected to be the minimum value or the minimum value of the "tension adjustment roller position". The position information of the lower end 243B of the tension adjustment roller 243 is recorded as the lower limit position correction.

The present invention has been described above based on the embodiments. It is obvious to those skilled in the art that various modifications can be implemented as combinations of each component or each process in the illustrated embodiments, and that such modifications are included in the scope of the present invention.

In addition, the configuration, action, and function of each device or each method described in the embodiments can be realized by hardware resources or software resources, or cooperation of hardware resources and software resources. As hardware resources, for example, a processor, ROM, RAM, and various integrated circuits can be used. As software resources, programs such as operating systems and applications can be used, for example. This application claims priority based on Japanese Patent Application No. 2022-045446 filed on March 22, 2022. The entire contents of this Japanese application are incorporated by reference into this specification.

1:Transportation control device 2:Conveying device 3: Objects to be transported 10: Position correction device 13: Position command generation department 14:Subtractor 15: Speed control department 16:Drive Department 17:Thrust control department 19:Terminal location information recording department 24: Tension adjuster 181: Calibration start signal generation unit 182: Calibration end signal generation unit 243: Tension adjustment roller 243A: Upper end 243B:Lower end 244:Cylinder 245: Position detection department

[Fig. 1] Schematically shows the structure of the transport control device. [Figure 2] is a functional block diagram of the position correction device of the tension adjustment roller. [Figure 3] is a functional block diagram of the position correction device of the tension adjustment roller. [Figure 4] is a functional block diagram of the position correction device of the tension adjustment roller. [Fig. 5] shows the position correction process of the tension adjustment roller by the position correction device over time.

10: Position correction device

17:Thrust control department

19:Terminal location information recording department

24: Tension adjuster

181: Calibration start signal generation unit

182: Calibration end signal generation unit

243: Tension adjustment roller

243A: Upper end

243B:Lower end

244:Cylinder

245: Position detection department

246:piston rod

247:Connecting rod

F:Thrust

Claims (10)

A position correction device is a position correction device of a tension adjustment roller. The tension adjustment roller can move in the direction of an applied thrust force and apply tension in the opposite direction to the thrust force to the object being conveyed. The position correction device is provided with: a correction start signal generating unit that generates a correction start signal before moving the tension adjustment roller to at least one end of the movable area of the tension adjustment roller in the direction of the thrust force; and The end position information recording part detects that the aforementioned tension adjustment roller has moved to the aforementioned end and records its position information. The position correction device of claim 1, wherein, The end position information recording unit records the position information closest to the end of the tension adjustment roller measured a plurality of times after the correction start signal is generated. The position correction device of claim 2, wherein, The end position information recording unit records the position information closest to the end of the tension adjustment roller that is continuously measured after the correction start signal is generated. The position correction device of any one of claims 1 to 3 further includes a correction completion signal generating unit, The correction end signal generating unit generates the correction end signal after the end position information recording unit detects that the tension adjustment roller has moved to the one end. The position correction device of any one of claims 1 to 3, wherein, The correction start signal generating unit generates the correction start signal before moving the tension adjustment roller to the other end of the movable area, The end position information recording unit detects that the tension adjustment roller has moved to the other end and records its position information. As claimed in any one of claims 1 to 3, the position correction device further includes a thrust control unit, The thrust control unit increases the thrust according to the correction start signal when the tension adjustment roller is moved in the direction of the thrust. As claimed in any one of claims 1 to 3, the position correction device further includes a thrust control unit, The thrust control unit reduces the thrust according to the correction start signal when the tension adjustment roller is moved in a direction opposite to the thrust. The position correction device of any one of claims 1 to 3, wherein, The thrust force is based on the air pressure of the cylinder connected to the tension adjustment roller. A position correction method is a position correction method of a tension adjustment roller that can move in the direction of an applied thrust and apply tension in the opposite direction to the thrust to the object to be conveyed. The position correction method includes: The correction start signal generating step is to generate the correction start signal before moving the tension adjustment roller to at least one end of the movable area of the tension adjustment roller in the direction of the thrust force; and The end position information recording step is to detect that the aforementioned tension adjustment roller has moved to the aforementioned end and record its position information. A position correction program that causes a computer to execute a position correction method for a tension adjustment roller that can move in the direction of an applied thrust and apply tension in the opposite direction to the thrust to a conveyed object. The position correction method has : The correction start signal generating step is to generate the correction start signal before moving the tension adjustment roller to at least one end of the movable area of the tension adjustment roller in the direction of the thrust force; and The end position information recording step is to detect that the aforementioned tension adjustment roller has moved to the aforementioned end and record its position information.

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