JP2018004576A - Position detection device, and reference position setting method in position detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position detection device and reference position setting method in the position detection device that allow a reference position meeting a sensation of workers to be easily set in a short time.SOLUTION: A position detection device 10 is provided in a web guide device 1 provided in a manufacturing line manufacturing products as continuously conveying a web W, and the position detection device 10 comprises: a transmission unit 12 that irradiates a web with a sound wave or electromagnet wave; a reception unit 13 that receives the sound wave or electromagnet wave discharged from the transmission unit 12; and a determination unit 20 that determines a deviation of a web end part WE with respect to a reference position on the basis of energy of the sound wave or electromagnetic wave received by the reception unit 13. The determination unit 20 comprises a storage function 21 that, when a reference setting signal is input to the determination unit 20, store the energy of the sound wave or electromagnetic wave being received by the reception unit 13 when the reference setting signal is input as a reference amount of light.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a position detection device and a reference position setting method in the position detection device.

  In production lines such as printing presses, paper diapers, films, cloths and non-woven fabrics (hereinafter referred to as production lines), processing and printing are carried out while continuously feeding a belt-like sheet (web) unwound from a raw fabric roll. Is called. In such a production line or the like, web meandering occurs as the web is conveyed, so a web guide device is provided to prevent meandering.

  As a web guide device, there has been developed a device that has a swing frame including a pair of rollers around which a web is wound, and prevents the web from meandering by swinging the swing frame (for example, a patent) Reference 1).

  In such a web guide device, in order to detect the meandering of the web, a position detection device that detects an end in the width direction of the web is provided (Patent Document 2). The web guide device operates so that the web does not meander based on a signal from the position detection device.

  In the position detection device of Patent Document 2, the amount of light detected by the light detection sensor is detected from the light emitted from the light source, and the movement of the end in the web width direction is determined based on the change in the amount of light. Specifically, in the position detection device of Patent Document 2, the light emitted from the light source is adjusted to a light beam having a predetermined cross-sectional shape, and when the web is placed at a predetermined position, the end of the web is a light beam. It is adjusted so that the middle line of the cross section of the two coincides. That is, it is adjusted so that the intermediate line of the cross section of the light beam becomes the reference position for arranging the end of the web. In addition, since the light from the light source is visible light in the position detection device of Patent Document 2, if the adjustment is made as described above, the operator can simply look at the shape of the light irradiated on the web. It is possible to grasp whether or not the web edge is displaced from the reference position.

  By the way, in the position detection device of Patent Document 2, before starting the operation of the equipment so that the reference position becomes an intermediate line of the cross section of the light beam when the web is arranged at a predetermined position, the following is performed: Carry out adjustment work.

  First, in a state where there is nothing between the light source and the light detection sensor, light is irradiated from the light source toward the light detection sensor, and the light amount (full open light amount) received by the light detection sensor is measured. Thereafter, a web or the like is disposed between the light source and the light detection sensor to block all light emitted from the light source to the light detection sensor. That is, the amount of light received by the light detection sensor (total closed light amount) is measured in a state where the light detection sensor cannot receive light from the light source. If the average value of the fully open light amount and the fully closed light amount is set as the reference light amount, the intermediate line of the cross section of the light beam can be set as the reference position.

JP 2000-128408 A Japanese Patent No. 3993943

However, in the above operation, since it is necessary to measure the fully open light amount and the fully closed light amount, it takes some time to adjust the position detection device. Moreover, in a production line or the like, a very large number of web guide devices are provided, and each web guide device is provided with a position detection device. For this reason, it takes a relatively long time to perform the reference position adjustment as described above for all the web guide devices.

  Further, when the optical axis of the light from the light source and the center of the light detection sensor coincide with each other, as described above, the average value of the fully open light amount and the fully closed light amount is used as the reference light amount, so that the reference position is the light beam. It can adjust so that it may become the intermediate line of a cross section. However, there are manufacturing errors and variations in the light source and the light detection sensor. Even if the light source and the light detection sensor are installed in the same manner, the optical axis of the light from the light source does not always match the center of the light detection sensor. There is. For example, ideally, if an LED or the like is attached to the substrate, the normal direction of the substrate and the optical axis of the LED or the like match, and if the normal direction of the substrate and the optical axis of the LED or the like match, the LED or the like Consider a case where the optical axis of the light coincides with the center of the light detection sensor. In this case, there may be a deviation between the normal direction of the substrate and the optical axis of the LED or the like when the LED or the like is attached to the substrate due to a manufacturing error of the LED or the like. In this case, the variation in the light emitted from the LED or the like to the light detection sensor is not necessarily rotationally symmetric. Then, even if the average value of the fully open light amount and the fully closed light amount is used as the reference light amount, the middle line of the cross section of the light beam may not be the reference position. That is, even if the operator determines that the web end portion and the reference position are coincident with each other by looking at the shape of the light irradiated on the web, the web end portion may be displaced from the reference position.

  When such a problem occurs, the reference light amount is adjusted to suit the operator's feeling (that is, whether the reference position is reset based on the shape of the light irradiated on the web) or the operator In addition, it is necessary to take one of the methods of obtaining the shape of the light beam in the state of the reference light amount.

  In the former case, since the work for adjusting the reference position in the web guide device has to be performed again, it takes extra time for the adjustment work. In the latter case, the operator cannot intuitively grasp the deviation between the web edge and the reference position, so it is difficult to adopt.

  In view of such circumstances, it is an object of the present invention to provide a position detection apparatus and a reference position setting method in the position detection apparatus that can easily and quickly perform a reference position setting that matches an operator's sense.

(Position detection device)
A position detection device according to a first aspect of the present invention is a position detection device provided in a web guide device provided in a production line for manufacturing a product while continuously conveying a web, the position detection device including a sound wave toward the web. Or, a transmitting unit that radiates electromagnetic waves, a receiving unit that receives sound waves or electromagnetic waves emitted from the transmitting unit, and a deviation of the web edge relative to the reference position based on the energy of the sound waves or electromagnetic waves received by the receiving unit And when the reference setting signal is input to the determination unit, the determination unit receives sound waves or electromagnetic waves received by the receiving unit when the reference setting signal is input. It has a storage function for storing energy as a reference value.
According to a second aspect of the present invention, in the first invention, the position detection device includes an input unit that transmits the reference setting signal when operated by an operator.
According to a third aspect of the present invention, in the first or second aspect of the invention, the transmitter emits visible light adjusted to a predetermined cross-sectional shape, and the receiver is irradiated from the transmitter. The visible light is received, and the determination unit determines a deviation of the web edge from a reference position based on the amount of light received by the reception unit, and the storage function of the determination unit When a reference setting signal is input to the unit, the storage unit stores a light amount received by the receiving unit as a reference light amount when the reference setting signal is input.
(Reference position setting method in position detection device)
In a position detection device provided in a web guide device provided in a production line for manufacturing a product while continuously conveying a web according to a fourth invention, a method for setting a reference position, wherein the position detection device is first, In the position detection device according to the second or third aspect of the invention, in a state where sound waves or electromagnetic waves are emitted from the transmitter, a web or a web substitute is disposed between the transmitter and the receiver, The reference setting signal is input to the determination unit in a state where the material is disposed at an appropriate position.
The reference position setting method in the position detection device of the fifth invention is a method for setting a reference position in a position detection device provided in a web guide device provided in a production line for manufacturing a product while continuously conveying a web. The position detection device is the position detection device according to the third aspect of the present invention, and in a state where visible light is irradiated from the transmitter, a web or a web substitute is disposed between the transmitter and the receiver, The web or web substitute is moved so that the visible light image formed thereon becomes an appropriate image, and the reference setting signal is sent to the determination unit in a state where the visible light image becomes an appropriate image. Is input.

According to the first invention, the reference setting signal is input in a state where the web or the web substitute material is arranged at a predetermined position. Then, regardless of the energy of the sound wave or electromagnetic wave transmitted by the transmitting unit or the energy of the sound wave or electromagnetic wave received by the receiving unit, a position that can be easily determined by the operator can be set as the reference position of the web end. Therefore, it is possible to perform alignment that matches the operator's sense. In addition, since the web end is only disposed at a position where the operator can easily determine, the reference position can be adjusted easily and in a short time.
According to the second aspect of the invention, since the reference setting signal can be input by operating the input unit, it is possible to easily perform alignment that matches the operator's sense.
According to the third aspect of the present invention, the web or the web substitute material is arranged so as to block the visible light irradiated from the transmitter, and the visible light image formed on the web or the web substitute material becomes an appropriate image. Input the reference setting signal in the Then, regardless of the amount of light emitted by the transmitter and the amount of light received by the receiver, a position where an image of visible light that can be easily determined by the operator can be set as the reference position of the web edge. Therefore, it is possible to perform alignment that matches the operator's sense. In addition, since a visible light image that can be easily determined by the operator is only formed on the web, the reference position can be adjusted easily and in a short time.
(Reference position setting method in position detection device)
According to the fourth aspect of the invention, the reference setting signal is input in a state where the web or the web substitute material is arranged at a predetermined position. Then, regardless of the energy of the sound wave or electromagnetic wave transmitted by the transmitting unit or the energy of the sound wave or electromagnetic wave received by the receiving unit, a position that can be easily determined by the operator can be set as the reference position of the web end. Therefore, it is possible to perform alignment that matches the operator's sense. In addition, since the web end is only disposed at a position where the operator can easily determine, the reference position can be adjusted easily and in a short time.
According to the fifth aspect of the present invention, the web or the web substitute material is arranged so as to block the visible light irradiated from the transmitter, and the visible light image formed on the web or the web substitute material becomes an appropriate image. Input the reference setting signal in the Then, regardless of the amount of light emitted by the transmitter and the amount of light received by the receiver, a position where an image of visible light that can be easily determined by the operator can be set as the reference position of the web edge. Therefore, it is possible to perform alignment that matches the operator's sense. In addition, since a visible light image that can be easily determined by the operator is only formed on the web, the reference position can be adjusted easily and in a short time.

(A) is a schematic explanatory drawing of the reference position adjustment by the position detection apparatus 10 of this embodiment, (B) is a schematic block diagram of the position detection apparatus 10. FIG. It is a schematic explanatory drawing of the web guide apparatus 1 provided with the position detection apparatus 10 of this embodiment, (A) is a schematic plan view, (B) is a schematic side view. It is the figure which showed the change of the visible light image by the relationship between the position detection apparatus 10 and the web edge part WE, (A) is the state by which the web edge part WE was arrange | positioned in the reference | standard position, (B) is a web edge. The part WE is in a state where it is located inward of the reference position, and (C) is the state in which the web end part WE is located outside of the reference position. It is the figure which showed the relationship between the position detection apparatus 10 and the web edge part WE when the transmission part 12 emits signals other than a visible light image, (A) is the web edge part WE arrange | positioned in the reference | standard position. (B) is a state where the web end portion WE is located inward of the reference position, and (C) is a state where the web end portion WE is located outward of the reference position. is there.

Next, an embodiment of the present invention will be described with reference to the drawings.
The position detection device of the present invention is a device provided in a web guide device that aligns a web in a production line or the like, and is capable of adjusting a reference position so as to be in a state suitable for an operator's sense. It has the characteristics.

  The production line to which the web guide device provided with the position detection device of the present invention is applied is not particularly limited. For example, the web guide device provided with the position detection device of the present invention can be used in a production line for producing products such as disposable diapers.

  The web conveyed in the production line to which the web guide device provided with the position detection device of the present invention is applied is not particularly limited. For example, the absorber used for a nonwoven fabric, a paper diaper, etc., a resin film, etc. can be mentioned.

(Basic configuration of the web guide device 1)
Below, the web guide apparatus 1 provided with the position detection apparatus 10 of this embodiment is demonstrated.

  As shown in FIG. 2, a web guide device 1 including the position detection device 10 according to the present embodiment (hereinafter sometimes simply referred to as the web guide device 1) includes a base 2. By fixing the base 2 to a frame or the like of a production line (not shown), the web guide device 1 is disposed on the production line or the like.

(Oscillating frame 4)
As shown in FIG. 2, a swing frame 4 is provided above the base 2. The swing frame 4 is provided with a pair of rollers 5 and 5. The pair of rollers 5 and 5 are wound around the web W, and are arranged so that their rotation axes are parallel to each other.
Note that a pair of rollers 5 is not necessarily provided, and one roller 5 may be provided. What is necessary is just to be able to hold | maintain the web W so that the pair of position detection apparatuses 10 and 10 mentioned later can detect the both ends of the web W in the state in which the web W was wound around the roller 5.

(Swing mechanism 7)
As shown in FIG. 1, the position detection device 10 of this embodiment includes a swing mechanism 7 that swings the swing frame 4. The swing mechanism 7 includes a swing shaft 8, and the swing frame 4 is attached to the base 2 via the swing shaft 8 of the swing mechanism 7 as shown in FIG. The swing shaft 8 is to hold the swing frame 4 so as to be swingable with respect to the base 2. Specifically, the swing shaft 8 holds the swing frame 4 so that the pair of rollers 5 and 5 can swing in parallel to the plane including the central axes of both the pair of rollers 5 and 5. To do. For example, as the swing shaft 8, a shaft having a rotation shaft provided to be rotatable with respect to the base 2 can be used. In this case, one end of the rotating shaft is fixed to the swing frame 4 and connected to swing means (for example, a motor) of the swing mechanism 7 (not shown). Then, if the swinging means is operated, the rotating shaft can be rotated around the central axis, so that the swing frame 4 can be swung.

(Position detection device 10)
As shown in FIG. 2, the web guide device 1 is provided with a pair of position detection devices 10 and 10 of the present embodiment. The pair of position detection devices 10 and 10 includes a determination unit 20 that determines whether or not the web end WE is at the reference position and which is shifted from the reference position (FIG. 1 ( B)). The determination unit 20 has a function of transmitting to the control unit 30 information relating to the deviation between the web edge WE and the reference position, specifically, a signal including information relating to the direction and amount of deviation (hereinafter referred to as a detection signal). doing.

  Specifically, as illustrated in FIG. 1, the pair of position detection devices 10 and 10 includes a transmission unit 12 and a reception unit 13 that are disposed so as to sandwich a position where the web W is conveyed. The transmitting unit 12 emits visible light toward the web W, and the receiving unit 13 has a function of receiving visible light emitted from the transmitting unit 12 and transmitting the amount of light to the determining unit 20. . Therefore, based on the amount of light received by the receiving unit 13 when the web end portion WE is disposed at the reference position (the amount of light including light that passes through the web W), the determination unit 20 determines that the web end portion WE is away from the reference position. It is possible to grasp whether it is shifted or in which direction it is shifted.

In FIG. 1, the transmitting unit 12 and the receiving unit 13 are provided so as to sandwich the position where the web W is conveyed. In other words, the transmitter 12 and the receiver 13 are provided so as to sandwich the conveyance path of the web W. However, the relative positions of the transmitter 12 and the receiver 13 are not particularly limited. What is necessary is just to arrange | position so that when the position of the web edge part WE changes, the light quantity which the receiving part 13 light-receives changes. For example, the receiving unit 13 may be arranged on the same side as the transmitting unit 12 with respect to the web W. In this case, the receiving unit 13 receives the light reflected on the surface of the web W.

(Control unit 30)
As shown in FIG. 1B, the control unit 30 is electrically connected to the pair of position detection devices 10 and 10. The control unit 30 has a swing control function for controlling the operation of the swing mechanism 7 based on detection signals transmitted from the pair of position detection devices 10 and 10 (that is, the determination unit 20). The swing control function is a function of controlling the swing amount and swing direction of the roller 5 by controlling the operation of the swing mechanism 7. Specifically, the swing control function has grasped that the end portion of the web W and the position detection device 10 have deviated from a predetermined positional relationship based on the detection signals detected by the pair of position detection devices 10 and 10. In such a case, it has a function of operating the swing mechanism 7 so as to return the web W to a predetermined positional relationship. For example, in FIG. 2, when the web W is shifted to the right side, the swing control function of the control unit 30 instructs the operation of the swing mechanism 7 so that the roller 5 swings clockwise. Then, since the web W can be moved leftward, the edge part of the web W can be returned to predetermined | prescribed positional relationship.

  Since the web guide device 1 has the configuration as described above, the web W can be prevented from meandering and the web end WE can be maintained in a predetermined position (that is, a reference position). Specifically, when the web end WE is deviated from the reference position, the pair of position detection devices 10 and 10 detects that the web end WE is deviated from the reference position, and a detection signal is transmitted from the pair of position detection devices 10 and 10 to the control unit 30. Sent to. Then, in the control unit 30, based on the detection signal, the swing control function controls the operation of the swing mechanism 7 and swings the roller 5 so that the web end WE returns to the reference position. By repeating this operation, both end portions E of the web W are maintained at the reference position, so that the web W can be conveyed without meandering.

(Regarding the reference position adjustment of the position detection apparatus 10 of the present embodiment)
By the way, during operation of a line that transports the web W, even when the web end WE and the reference position are misaligned, it may be mistaken for the web end WE to be disposed at the reference position.

  For example, when the light receiving surface of the receiving unit 13 is contaminated with dust or the like, it is determined that the amount of received light is insufficient even when the web end WE is disposed at the reference position. Then, the roller 5 is swung by the control unit 30 so that the receiving unit 13 receives the light of the reference light amount, so that the web end portion WE is moved to a position shifted from the original reference position.

  If visible light is applied to the web W as in the position detection device 10 of the present embodiment, the operator can solve the above problem by viewing the visible light image on the web W. For this purpose, it is necessary to set the reference position so that the operator can determine whether or not the web end WE is disposed at the reference position only by looking at the visible light image.

  Since the position detection device 10 of the present embodiment has the following configuration, the reference position can be set appropriately.

  As illustrated in FIG. 1B, the determination unit 20 of the position detection device 10 includes a storage function 21 that stores a reference position. The storage function 21 has a function of storing, as a reference light amount, a light amount received by the receiving unit 13 when a reference setting signal is input to the determination unit 20. In other words, the storage function 21 determines the amount of light received by the receiving unit 13 relative to the amount of light (full light amount) with no web W between the transmitting unit 12 and the receiving unit 13. Regardless, the light quantity received by the receiving unit 13 when a reference setting signal is input is stored as a reference light quantity.

  Further, as shown in FIG. 1B, the determination unit 20 of the position detection device 10 of the present embodiment includes an input unit 15. The input unit 15 is configured to transmit a reference setting signal to the determination unit 20 when operated by an operator. For example, an input button or the like can be employed as the input unit 15.

  The position detection device 10 of the present embodiment having the above-described configuration can set a reference light amount, in other words, a reference position where the web end WE is to be arranged, as described below.

  First, in a state where light is emitted from the transmission unit 12, a member, a web W, a plate material, or the like that can block light so as to block the light irradiated from the transmission unit 12 (hereinafter referred to as web W or the like) There is). As shown in FIG. 1, when the transmitting unit 12 and the receiving unit 13 are provided so as to face each other, a web W or the like is disposed between the transmitting unit 12 and the receiving unit 13. Then, a part of the light emitted from the transmission unit 12 does not reach the reception unit 13, and the light amount detected by the reception unit 13 is smaller than the fully open light amount. Even in this state, part of the light emitted by the transmitter 12 reaches the receiver 13.

  When the transmitter 12 and the receiver 13 are provided on the same side with respect to the web W or the like, the light reflected by the web W or the like is received by the receiver 13.

  In this state, the operator confirms the visible light image formed on the surface of the web W or the like, and confirms whether or not the shape is a shape that can be determined as the reference position. If the visible light image has a shape that can be determined as the reference position, the operator operates the input unit 15 to transmit a reference setting signal to the determination unit 20. Then, the storage function stores the light amount detected by the receiving unit 13 at that time as the reference light amount. That is, when it becomes the said state, the judgment part 20 comes to judge that the web edge part WE is a reference | standard position.

  For example, when the cross-sectional shape of the visible light BM is circular, a semicircular shape is suitable as the visible light image that can be determined as the reference position (see FIG. 3A). Therefore, if the operator operates the input unit 15 when the visible light image on the web W becomes a semicircular shape, the storage function 21 stores the light amount in that state as the reference light amount.

  On the other hand, when the worker confirms the visible light image formed on the surface of the web W or the like and the shape is not suitable for the reference position (for example, FIGS. 3B and 3C), the worker Move the web W etc. Then, the visible light image is adjusted so as to have a shape that can be determined as a reference position (for example, a semicircle as described above). If the visible light image has a shape that can be determined as the reference position, the operator operates the input unit 15 in the same manner as described above, and the light amount detected by the receiving unit 13 at that time is stored in the storage function 21 as the reference light amount. Remember.

  As described above, in the position detection device 10 of the present embodiment, the position at which a visible light image that is easy for the operator to determine can be formed on the web W or the like as the reference position. Alignment can be performed.

  Then, even when the reference position is shifted during the conveyance of the web W, the operator can grasp that the reference position is shifted only by looking at the visible light image.

  Further, when setting the reference position, the light emitted from the transmitter 12 is blocked in the state where the light is emitted from the transmitter 12 (in FIG. 1, between the transmitter 12 and the receiver 13). Since the visible light image is formed by arranging the web W or the like between them and the visible light image is simply adjusted to a shape that is easy for the operator to determine, the reference position can be adjusted easily and in a short time.

  Furthermore, regardless of the amount of light emitted by the transmitter 12 and the amount of light received by the receiver 13, the reference position can be a time when a visible light image that can be easily determined by the operator is obtained. For this reason, even if there are variations in the light source of the transmitter 12 and the sensor of the receiver 13, and there is an assembly error of the position detection device 10, the operator can properly recognize the deviation between the web end WE and the reference position. .

(About the input unit 15)
Note that the input unit 15 described above is not necessarily operated by an operator. For example, a visible light image on the web W or the like may be photographed by a photographing device such as a CCD camera, and an analysis system for analyzing the shape of the visible light image based on the photographed image may be provided. Then, when the visible light image has a predetermined shape, the reference setting signal can be transmitted to the determination unit 20 without the operator operating the input unit 15 as described above. In this case, a visible light image (reference image) that can be easily identified by the operator is stored in advance in the analysis system. Then, the visible light image on the photographed web W or the like is compared with the reference image, and when the visible light image matches the reference image, a reference setting signal is transmitted to the determination unit 20. Then, the adjustment of the reference position can be automated.

(About the judgment unit 20)
In the above example, the case where the determination unit 20 is provided in the position detection device 10 has been described. The determination unit 20 may be provided in each of the pair of position detection devices 10 and 10 or may be provided in only one of the position detection devices 10.

  Further, the determination unit 20 may be provided separately from the pair of position detection devices 10 and 10 as long as the reception unit 13 receives light and information on the amount of light is supplied. For example, the determination unit 20 may be provided in the control unit 30 described later. In this case, information regarding the light amount detected by the receiving unit 13 is transmitted from the position detection device 10 to the control unit 30. Then, based on the transmitted signal, the determination unit 20 provided in the control unit 30 determines the deviation between the web end WE and the reference position, and supplies the information to the swing control function of the control unit 30. become.

(Signal emitted by the transmitter 12)
In the above example, the case where the transmitter 12 emits visible light has been described, but the signal (SW in FIG. 4) emitted by the transmitter 12 is not particularly limited. For example, the transmitter 12 may emit electromagnetic waves other than visible light such as infrared rays and radio waves, and sound waves such as ultrasonic waves. Even in this case, the energy of the signal SW received by the receiving unit 13 changes when the web W or the like is present and when the signal is blocked by the web W or the like. Therefore, the position of the web edge WE can be grasped by this energy change.

  Even when the transmitter 12 emits electromagnetic waves and sound waves other than visible light, the arrangement of the transmitter 12 and the receiver 13 is not particularly limited. That is, it is only necessary that the energy of the signal received by the receiving unit 13 is changed when the position of the web end WE is changed.

(About alignment)
As described above, when a signal other than visible light is emitted, it is desirable to provide a mark so that the operator can recognize the reference position where the web end WE is placed. For example, if the position detecting device 10 is provided with a protrusion p (see FIG. 4) or a line that fits the web end WE, the web end WE is appropriately adjusted by aligning the web end WE with the protrusion p or the line. It can also be arranged at various positions.

  The position detection device of the present invention is suitable as a device for detecting the position of the end portion of the web that is continuously conveyed in the production line.

DESCRIPTION OF SYMBOLS 1 Web guide apparatus 10 Position detection apparatus 12 Transmission part 13 Reception part 15 Input part 20 Judgment part 21 Memory | storage function 30 Control part W Web BM Visible light

Claims (5)

A position detection device provided in a web guide device provided in a production line for producing a product while continuously conveying a web,
The position detection device includes:
A transmitter that emits sound waves or electromagnetic waves toward the web;
A receiver for receiving the sound wave or electromagnetic wave emitted from the transmitter;
A determination unit that determines a deviation of the web edge from a reference position based on energy of sound waves or electromagnetic waves received by the reception unit, and
The determination unit
When a reference setting signal is input to the determination unit, a storage function is provided for storing, as a reference value, the energy of a sound wave or electromagnetic wave received by the receiving unit when the reference setting signal is input. A position detection device. The position detection device includes:
The web guide device according to claim 1, further comprising an input unit that transmits the reference setting signal when operated by an operator. The transmitter is
It irradiates visible light adjusted to a predetermined cross-sectional shape,
The receiving unit is
Receiving visible light emitted from the transmitter,
The determination unit
Based on the amount of light received by the receiving unit, to determine the deviation of the web end relative to the reference position,
The memory function of the determination unit is:
When a reference setting signal is input to the determination unit, the storage unit stores a light amount received by the receiving unit as a reference light amount when the reference setting signal is input. Item 3. The position detection device according to Item 1 or 2. In a position detection device provided in a web guide device provided in a production line for manufacturing a product while continuously conveying a web, a method for setting a reference position,
The position detection device according to claim 1, 2, or 3,
In a state where sound waves or electromagnetic waves are emitted from the transmitter, a web or a web substitute is disposed between the transmitter and the receiver,
A reference position setting method in a position detection device, wherein the reference setting signal is input to the determination unit in a state where a web or a web substitute is arranged at an appropriate position. In a position detection device provided in a web guide device provided in a production line for manufacturing a product while continuously conveying a web, a method for setting a reference position,
The position detection device according to claim 3, wherein the position detection device comprises:
In a state where visible light is irradiated from the transmitter, a web or a web substitute material is disposed between the transmitter and the receiver,
Move the web or web substitute so that the visible light image formed on it is an appropriate image,
A reference position setting method in a position detection apparatus, wherein the reference setting signal is input to the determination unit in a state where an image of visible light becomes an appropriate image.

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