JPH0643221B2 - Position control device for support member of winding roll - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position control device for a support member of a winding roll that moves a support member that supports the winding roll and controls the position thereof.

2. Description of the Related Art Structures of the Prior Art and Their Problems For example, a slitter in which a web material such as paper or plastic film is shredded into a plurality of strips and wound on a plurality of winding rolls is generally used. FIG. 2 shows a conventional slitter. This slitter has a take-up roll (R) and a pressing roller (1), and the take-up roll (R) is attached to a take-up shaft and supported by a support arm (2). The support arm (2) has a fulcrum (3) and is swingably guided around it. Then, the winding shaft is driven by the motor (M), and the winding roll (R) rotates integrally with the winding shaft. The presser roller (1) is supported by the support arm (4), the support arm (4) has a fulcrum (5), and the air cylinder
It is transmission-coupled to (6). Therefore, the air cylinder
When the support arm (4) is swung by (6), the pressing roller (1) can be pressed against the winding roll (R).

Therefore, when the feed roller (7) is driven by the motor (M), the web material such as paper, plastic film, etc.
(W) can be sent to the winding roll (R) and wound.
Further, the pressing roller (1) is pressed against the take-up roll (R), an appropriate tension is applied to the web material (W), and the web material (W) receives the contact pressure of the pressing roller (1). Therefore,
The web material (W) can be wound tightly.

By the way, in this slitter, in order to accurately wind the web material (W), it is necessary that the winding tension of the web material (W) and the contact pressure of the pressing roller (1) do not fluctuate. To achieve this, the web material (W) must be a take-up roll.
It is preferable to keep the pressing roller (1) at a constant position regardless of the winding diameter (D) of the winding roller (R), which increases the winding diameter (D).

Therefore, in many cases, the support arm of the take-up roll (R) is
(2) is hydraulically connected to the hydraulic cylinder (8), and the winding roll (R)
It is well known that the support arm (2) is swung and moved by the hydraulic cylinder (8) along with the increase of the winding diameter (D). For example, the number of revolutions (n) of the feed roller (7) and the take-up roll by a pulse generator (PG)
(R) and the number of rotations (N) of the winding shaft are detected. Then, the detection signal is sent to the operational amplifier (9) and the control device (10), and based on the diameter (d) of the feed roller (7), the winding roll
Calculate the diameter (D) of (R). When the web material (W) is fed by the feeding roller (7), the feeding amount (πdn) is equal to the winding amount (πDN) of the winding roll (R). Therefore, the winding diameter (D) of the winding roll (R) is expressed by the following equation.

πDN = πdn D = dn / N Further, a control signal corresponding to this calculated value is generated and applied to the control amplifier (11) and the servo valve (12).
When the hydraulic cylinder (8) is driven by the servo valve (12), the support arm (2) is attracted by the hydraulic cylinder (8) as the winding diameter (D) of the winding roll (R) increases, and the winding is performed. Supporting roll (R) and support arm (2)
It swings around (3) and moves. Furthermore, the position of the support arm (2) is detected by the potentiometer (PM),
When the hydraulic cylinder (8) and the servo valve (12) are feedback-controlled by the controller (10), the support arm (2)
Can be moved accurately. Therefore, the pressing roller (1) can be kept at a fixed position.

As the actuator of the support arm (2), a hydraulic motor or a servomotor and its control unit may be used instead of the hydraulic cylinder (8) and the servovalve (12). Furthermore, as a support member for the winding roll (R),
Instead of the support arm (2), a support member that moves linearly in the horizontal direction may be used.

However, this winding diameter calculation method has a problem associated with the calculation error. For example, when the web material (W) is fed by the feed roller (7) and the web material (W) slips on the feed roller (7), the rotation number (n) of the feed roller (7) becomes the feed amount. Do not correspond. Therefore, an error occurs in the calculated value of the winding diameter (D) of the winding roll (R). Therefore, there is a problem in that the support member of the take-up roll (R) cannot be moved accurately and the pressing roller (1) cannot be kept at a fixed position.

Further, in the case of the slitter, it is necessary to rotate each of the plurality of take-up rolls (R), and in many cases, a so-called friction drive system is adopted as a drive system of the take-up rolls (R). In the friction drive system, take-up roll
(R) is supported by a common winding shaft. And take-up roll
The friction between (R) and the take-up shaft is used, the take-up shaft is overdriven by the motor (M), and the take-up roll (R) is driven by the friction. Therefore, the rotation speed of the winding shaft does not match the rotation speed of the winding roll (R), and the rotation speed of the winding shaft (N)
Even if it detects, it does not correspond to the winding amount of the winding roll. Therefore, there is also a problem that this winding diameter calculation method cannot be used for a friction drive type slitter.

Therefore, the present invention provides a position control device for a support member of a take-up roll, which supports the take-up roll on a support member and moves the support member by an actuator as the winding diameter of the take-up roll increases. The object of the present invention is to solve the problems of the conventional calculation error and the winding system of the winding roll, to accurately move the support member of the winding roll, and to keep the pressing roller at a constant position.

According to the present invention, the winding roll (R) is supported by the support member (2), and the pressing roller (1) is attached to the winding roll (R).
Web material (W) such as paper, plastic film, etc. is wound onto the winding roll (R) and the winding diameter (D)
In the device in which the supporting member (2) is moved by the actuator (8) to keep the pressing roller (1) at a constant position with the increase of the detector, a detector for detecting the position of the pressing roller (1). (13), connected to the detector (13) and the actuator (8), sampling the detection signal (α) of the detector (13) at a preset sampling time, The average value of the sampling values is calculated, this average value is compared with a reference value relating to the position of the pressing roller (1), and the winding diameter [β _s of the winding roll (R) is determined based on the difference (Δα).
+ (Δβ ₁ + Δβ ₂ + ... Δβ _n-1 + Δβ _n )], and a control device (14) for driving the actuator (8) by a control signal (β _n ) corresponding to the calculated value. A position control device for a support member of a winding roll is provided.

Description of Embodiments Hereinafter, embodiments of the present invention will be described. FIG. 1 shows an embodiment of the present invention. This device is a slitter take-up roll (R)
This is for swinging and moving the support arm (2) for supporting the. The pressing roller (1) is supported by the supporting arm (4), and the supporting arm (4) is operated by the air cylinder (6) and rocks, so that the pressing roller (1) is pressed against the winding roll (R). Is the same as in FIG. In addition, the web material (W) such as paper and plastic film is taken up by the take-up roll.
The hydraulic cylinder (8) is driven by the servo valve (12) as it is wound around (R) and the winding diameter (D) increases.
The winding arm (2) is operated by the hydraulic cylinder (8),
Swinging and moving are the same as in FIG.

This device has a detector (13) such as a differential transformer. The detector (13) is for detecting the position of the pressing roller (1) and is connected to the support arm (4). Therefore, the support arm (4) swings around the fulcrum (5) and the pressing roller
When the position of (1) changes, the support arm (4) moves to the detector (13).
The position of the pressing roller (1) is detected by the detector (13). The detection signal (α) is composed of an output voltage having a magnitude corresponding to the position of the pressing roller (1).

Further, the control device (14) is connected to the detector (13), and is connected to the servo amplifier (15) and the servo valve (12).
The control device (14) is for sampling the detection signal (α) of the detector (13) and generating the control signal (βn) of the hydraulic cylinder (8) and the servo valve (12). (16) and a reference value setting unit (17). Then, the sampling time is preset by the setting unit (16), the detection signal (α) of the detector (13) is sampled at the sampling time, and the average value of the sampling values is calculated for each sampling time. further,
In the setting section (17), a reference value for the position of the presser roller (1) is set in advance. Then, the average value of the sampling values is compared with the reference value of the setting unit (17). In this embodiment, when the support arm (4) of the pressing roller (1) is in the vertical position, the magnitude of the detection signal (α) given from the detector (13) to the control device (14) is taken into consideration. A value having the same magnitude as the detection signal (α) is set as the reference value.

In addition, photo switch (PH) and potentiometer
(PM) is connected to the controller (14). Then, as will be described later, at the beginning of the work of winding the web material (W), the support switch (4) of the pressing roller (1) causes the photoswitch (P
H) works. Potentiometer (PM) is a take-up roll
This is for detecting the position of the (R) support arm (2).

In this device, when winding the web material (W) on the take-up roll (R), first, the take-up roll (R) is operated by the hydraulic cylinder (8), and the supporting arm (2) of the take-up roll (3) is used as the fulcrum (3). ), The winding roll (R) approaches the pressing roller (1) and comes into contact therewith. Therefore, the press roller (1) is pushed in by the take-up roll (R), and its support arm (4) swings around the fulcrum (5). When the support arm (4) of the presser roller (1) swings to the vertical position, the support arm (4) operates the photo switch (PH), and the photo switch (PH) stops the hydraulic cylinder (8). , Winding roll (R) support arm
(2) is held in that position. Therefore, take-up roll
Support arm depending on whether the initial diameter of (R) is large or small
The position of (2) is different. When the photo switch (PH) is operated by the support arm (4), the potentiometer
The position of the support arm (2) is detected by (PM), and the detection signal (β) is given to the control device (14), and the winding roll is wound.
It is input as the initial diameter (βs) of (R). After that, the web material (W) is wound around the take-up roll (R),
The winding work of (W) is started.

Then, when the web material (W) is taken up by the take-up roll (R) and its winding diameter (D) increases, the position of the presser roller (1) is detected by the take-up roll (R), and the detection signal thereof is detected. (α)
Is provided to the controller (14). Then, in the control device (14), the detector has the sampling time of the setting unit (16).
The detection signal (α) of (13) is sampled, the average value of the sampling values is calculated for each sampling time, and the average value of the sampling values is compared with the reference value of the setting unit (17). Then, based on the difference (Δα), the hydraulic cylinder
(8) and servo valve (12) control signal (βn) is taken out, and this is the servo amplifier (15) and servo valve (12).
Given to.

When the support arm (4) of the presser roller (1) is in the vertical position, the detection signal (α) of the detector (13) is as large as the reference value of the setting section (17). Therefore, the difference (Δα) between the average value of the sampling values and the reference value of the setting unit (17) is 0. When the support arm (4) of the press roller (1) is pushed in from the vertical position as the winding diameter of the take-up roll (R) increases, the average value of the sampling values and the reference value of the setting unit (17) Difference (Δα) occurs. Therefore, this corresponds to the increase (Δβ) in the winding diameter (D) of the winding roll (R). In this embodiment, the increase (Δβ) of the winding diameter (D) of the winding roll (R) is calculated from the difference (Δα) between the average value of the sampling values and the reference value of the setting unit (17), and this is wound. Initial diameter of take roll (R)
It is added to (βs). Then, this is repeated at every sampling time to increase the winding diameter (D) of the winding roll (R).
The control signal is obtained by adding (Δβ) to the initial diameter (βs).
It is taken out as (βn).

β _n = β _s + (Δβ ₁ + Δβ ₂ + ... Δβ _n-1 + Δ
β _n ) Then, the servo valve (12) is driven by the control signal (β _n ), the hydraulic cylinder (8) is driven by the servo valve (12), and the support arm of the take-up roll (R) is driven by the hydraulic cylinder (8). (2) is attracted. Therefore, the take-up roll (R) and the support arm (2) have a winding diameter of the take-up roll (R).
Swing and move by the increment (Δβ) of (D), and presser roller
(1) and the support arm (4) follow the take-up roll (R),
Swing around the fulcrum (5). Further, the position of the support arm (2) is detected by the potentiometer (PM), and the detection signal (β) is given to the control device (14), and the control device (1)
The hydraulic cylinder (8) and the servo valve (12) are feedback-controlled by 4). Therefore, take-up roll
The (R) support arm (2) can be accurately swung and moved, and the pressing roller (1) and the support arm (4) are returned to the vertical position. Therefore, the pressing roller (1) can be kept at a fixed position.

Therefore, in the case of this device, the detection signal of the detector (13)
It can be said that the winding diameter (D) of the winding roll (R) is converted by (α), and the control signal (βn) corresponds to the winding diameter (D) of the winding roll (R). be able to. Therefore, the support arm (2) of the take-up roll (R) is swung by the hydraulic cylinder (8) and the servo valve (12) to increase the increase (Δβ) in the winding diameter (D) of the take-up roll (R). Can be compensated. As a result, the pressing roller (1) can be kept at a fixed position.

Further, in the case of this device, when the take-up roll (R) is eccentric with respect to the take-up shaft, the pressing roller (1) vibrates each time the take-up roll (R) rotates, but the hydraulic cylinder (8) and The servo valve (12) is unaffected. When the presser roller (1) vibrates, the vibration is detected by the detector (13), but the detector (13) compares it with the reference value of the setting unit (17).
It is not the detection signal (α) but the average value of the sampling values. Then, based on the difference (Δα), the control signal (βn) of the hydraulic cylinder (8) and the servo motor (12) is taken out. Therefore, even if the presser roller (1) vibrates,
There is no risk of so-called hunting.

In this embodiment, when the press roller (1) is pushed in by the take-up roll (R) and the support arm (4) swings from the vertical position, the average value of the sampling values is set to the setting section (1).
It is smaller than the set value of 7), and the difference (Δα) is smaller than 0. Then, based on this difference (Δα), the hydraulic cylinder
The control signal (βn) of (8) and the servo valve (12) is taken out. On the other hand, for example, the hydraulic cylinder (8) is driven by a malfunction, the take-up roll (R) and the support arm (2) are swung by the hydraulic cylinder (8), and the support arm (4) of the presser roller (1) is When swinging in the opposite direction, the average value of the sampling values becomes larger than the setting value of the setting section (17), and the difference (Δα) becomes larger than 0, but this is due to the hydraulic cylinder (8) and the servo valve ( 12) Control signal
Not added to (βn). Therefore, the previous control signal
Only the control signal (βn) having the same magnitude as (βn-1) is taken out, and the hydraulic cylinder (8) and the servo valve (12)
Is not driven, and the winding roll (R) and the support arm (2) do not swing. Then, the web material (W) is wound up as it is.

Therefore, in the case of this device, it is not necessary to detect the rotation speed (n) of the feed roller (1) as in the conventional case. Therefore, the problem associated with the calculation error of the winding diameter (D) of the winding roll (R) does not occur, and the winding arm (2) can be accurately swung. Further, it is not necessary to detect the rotation speed (N) of the winding roll (R). Therefore, regardless of the drive system of the winding roll (R), the winding arm (2) is swung by the hydraulic cylinder (8) with the increase of the winding diameter (D) of the winding roll (R), and the presser foot is pressed. The roller (1) can be kept in a fixed position.

As the actuator of the support arm (2), a hydraulic motor or a servomotor and its control unit can be used instead of the hydraulic cylinder (8) and the servo valve (12). Instead of the support arm (2), a support member that moves linearly in the horizontal direction may be used as the support member for the winding roll (R).

EFFECTS OF THE INVENTION As described above, according to the present invention, the position of the pressing roller (1) is detected by the detector (13). Further, the control device (14) is connected to the detector (13) and the actuator (8), and the control device (14) detects the detection signal (α) of the detector (13) with a preset sampling time.
Is sampled, the average value of the sampled values is calculated for each sampling time, and the average value is calculated.
It is compared with the reference value for the position in (1). Then, based on the difference (Δα), the winding diameter [β _s + (Δβ ₁ + Δβ ₂ + ... Δβ _{n-1 of the} winding roll (R) by the control device (14).
+ Δβ _n )] is calculated, and the actuator (8) is driven by the control signal (β _n ) corresponding to the calculated value.
Therefore, according to the present invention, the take-up roll (R) is supported by the support member (2), the pressing roller (1) is pressed against the take-up roll (R), and the web material (W) is taken up by the take-up roll (R). ), The support member (2) can be moved by the actuator (8) as the winding diameter (D) of the take-up roll (R) increases, and the presser roller (1) can be kept in a fixed position. , The winding tension of the web material (W) and the contact pressure of the pressing roller (1) do not change. Also, the detector (13) detects the position of the presser roller (1), and this detects the winding diameter (D) of the take-up roll (R).
Can be calculated and the support member (2) of the take-up roll (R) can be moved, and there is no problem with the conventional calculation error and the drive system of the take-up roll (R). Furthermore, for example,
When the take-up roll (R) is eccentric with respect to the take-up shaft, the presser roller (1) vibrates each time the take-up roll (R) rotates and the detector rolls out.
The vibration is detected by (13), but according to the present invention, it is the detector (13) that is compared with the reference value of the control device (14).
It is not an individual value of the detection signal (α), but an average value of its sampling values. Then, the difference between the average value and the reference value (Δ
The winding diameter of the take-up roll (R) [β _s + (Δβ
₁ + Δβ ₂ + ... Δβ _n-1 + Δβ _n )] is calculated, and the actuator (8) is driven by the control signal (β _n ) corresponding to the calculated value. Therefore, the actuator (8) does not respond to the vibration of the pressing roller (1) and so-called hunting does not occur.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention, and FIG. 2 is an explanatory view showing a conventional position control device for a support member of a winding roll. (R) …… Winding roll (1) …… Pressing roller (2) …… Support arm (W) …… Web material (8) …… Hydraulic cylinder (12) …… Servo valve (13) …… Detector (14) …… Control device

Claims (1)

[Claims] 1. A web material (W) such as paper or plastic film, which supports a winding roll (R) on a support member (2) and presses a pressing roller (1) against the winding roll (R).
Is wound around the winding roll (R), and as the winding diameter (D) increases, the support member is moved by the actuator (8).
(2) is moved so that the presser roller (1) is kept at a constant position, a detector (13) for detecting the position of the presser roller (1), the detector (13) and the Connected to the actuator (8), the detection signal (α) of the detector (13) with a preset sampling time
Is sampled, an average value of the sampling values is calculated at each sampling time, and the average value is compared with a reference value relating to the position of the pressing roller (1), and the difference (Δ
Based on α), the winding diameter of the winding roll (R) [β _s +
(Δβ ₁ + Δβ ₂ + ... Δβ _n-1 + Δβ _n )], and a control device (14) for driving the actuator (8) by a control signal (β _n ) corresponding to the calculated value. Position control device for support member of take-up roll.