JPH02239065A - Rewinding tension control method and rewinding device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a rolling crease by coping with the rewinding speed change of a beltlike matter on the basis of a tension pattern which fixes a rewinding internal stress that is at a fixed speed previously set, and correcting a rolling away tension. CONSTITUTION:At a tension control means 12, the control of tension is conducted on the basis of a tension pattern 14 which fixes a rewinding internal stress that is at a fixed speed previously set. This tension pattern 14, for example, according to a fixed rewinding speed set by the kind, the roll number or the like of a beltlike matter F, sets a rewinding tension each in coping with a fixed rewinding speed so that the internal stress of the beltlike matter F may be kept fixed at all times at a rewinding speed. And, at the tension control means 12, for example, when the rewinding speed A1 of the beltlike matter F is selected, a motor 4 is controlled at the rolling away speed A1, and a tension control value is obtained so as to become a rewinding tension coping with a rewinding speed, by means of a transport tension detected by a rewinding tension detector 9 at this time and a roll outer diameter from a rewinding operation means 10 and the correction of tension according to a speed from a tension correction means 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a winding tension control method and a winding device that are applied to the production and inspection of strips of films, paper, cloth, etc., for example. [Prior Art] Some winding devices that roll a strip onto a core are used at a constant speed from the beginning of winding to the end of winding. This winding tension is controlled as shown in Figure 344.
In order to make the residual internal stress P of the removed strip uniform, the winding tension a2 is set according to the properties of the strip, and the winding tension a2 is set according to the winding speed al, and the winding tension is set according to the winding speed b1. In b2, the winding tension C2 is determined in accordance with the winding speed C1, and the winding tension is decreased as the winding diameter increases. There are various tension patterns such as straight lines and curves to keep the internal stress P constant under constant speed, but here we will explain Taber control, which lowers the tension linearly with respect to the winding diameter. [Problems to be Solved by the Invention] In the process of manufacturing a strip, the winding speed of the strip may be reduced. For example, when inspecting the surface of a strip that has already been wound into a roll around one core, A device consisting of a rewinder and a winder is used to perform inspections while rewinding. In this work, unwinding is inspected and wound at a constant speed,
In order to particularly increase productivity in this work, the belt-like material is conveyed at high speed, and the tension is set accordingly. In some cases, the speed may be reduced as shown by the dashed line. Also, the take-up speed bl, . When c1 is selected, the inspection may be performed at a lower speed as well. In this way, when the winding speed of the strip becomes lower than the constant speed, if the tension pattern is continued at a constant speed,
As shown in FIG. 4 when the take-up speed a1 is controlled, defects called winding wrinkles occur in the belt-like material F at the winding diameter ratios D1 and D2 where the winding speed is low. This is because control is performed to reduce the tension a2 in a tapered manner in order to bring the internal stress P of the wound strip closer to uniformity during winding tension control. Control (Xl> is the type of strip (thickness, width), number of strips (length), winding speed a1
However, if the speed is reduced during transportation, such as when inspecting the surface of a strip, the internal stress P will partially increase as shown by the broken line unless the tension is lowered to match the reduced speed. It is thought that the winding wrinkles occur in this area.

This invention was made in view of the above circumstances, and the winding tension is changed in accordance with the increase/deceleration of the winding speed of the strip, and the winding tension is corrected according to the winding speed. The purpose of this paper is to provide a winding tension control method and winding device that prevent the occurrence of wrinkles. [Means for Solving the Problems] In order to solve the above problems, the invention according to claim 1 provides a winding tension control method for winding a belt-like material into a roll around a core. The feature is that the winding tension is corrected in response to fluctuations in the winding speed of the strip, based on a tension pattern that keeps the internal stress constant, which can cause a drop in speed. Further, the invention according to claim 2 provides a winding device for winding a strip material around a core in a roll shape, and a preset tension pattern that makes the winding internal stress constant at a constant speed, and It is characterized by having means for correcting the winding tension in response to fluctuations in the winding speed based on the winding speed. Further, in the winding device according to claim 2, a winding diameter calculating means for determining a preset tension pattern that makes the winding internal stress constant at a constant speed, and an outside diameter of the roll of the strip material; Tension correction means for correcting the winding tension according to the winding speed from the outer diameter of the roll, and tension control means for further correcting the corrected winding tension according to a preset tension pattern. It is characterized by having the following. [Function] In this invention, the winding tension is corrected in response to fluctuations in the winding speed of the strip based on a tension pattern that keeps the winding internal stress constant under a preset constant speed, thereby improving operational and work efficiency. The winding tension is corrected according to the required change in winding speed, and winding can be performed from the beginning to the end with the winding tension commensurate with the winding speed and diameter. In this way, by correcting the winding tension according to the change in the winding speed, it is possible to always keep the winding internal stress constant regardless of the winding diameter of the strip. , it is possible to prevent the occurrence of wrinkles, especially during low-speed winding. [Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings. Figure 2 is a schematic diagram showing a winding device to which the present invention is applied, Figure 2 is a diagram showing the relationship between winding diameter, winding tension, winding speed, and winding internal stress, and Figure 3 is a diagram showing the relationship between winding speed and winding speed. This is a diagram showing the relationship between the winding tension and the winding tension. In the figure, reference numeral I denotes a winding device which winds the strip F from a winder 2 to a winder 3. This winding is performed by driving a motor 4 provided in the winding section 3, and the winding tension of the strip F is set by a tension setting device 5. A guide roller 6 is disposed on the conveyance path of the strip F, and a conveyance rotation speed detector 8 for detecting the rotation speed of the conveyance roller rough and a winding tension detector 8 for detecting the take-up tension during conveyance of the strip F are further disposed on the conveyance path. A detector 9 is provided. Information on the rotation speed of the conveyance roller rough is inputted manually to the winding diameter calculation means 10 and the tension correction means 11 by the conveyance rotation speed detector 8 . Further, the tension of the strip F obtained by the winding tension detector 9 is manually inputted to the tension control means 12. The winder 3 is equipped with a winding rotation speed detector 13 for detecting the winding rotation speed of the strip F, and this winding rotation speed is manually input to the winding diameter calculation means 10. In the winding diameter calculation stage 10, the winding outer diameter of the roll is calculated from the winding rotation speed and the conveyance rotation speed, and information on this winding outer diameter is sent to the tension correction means 11. The tension correction means 11 calculates the winding speed from this outside diameter and the rotation speed information sent from the conveyance rotation speed detector 8, corrects the winding tension corresponding to the winding speed, and sends it to the tension control section 1000 stages 12. ．． The tension control means 12 controls the tension based on a tension pattern 14 that keeps the winding inner stress constant at a preset constant speed. As shown in FIG. 2, this tension pattern 14 is determined by, for example, the type (thickness, width)
, constant winding speed A1 set by the number of windings (winding length), etc.
~C1, the strip F at the winding speed A1~C1
In order to keep the inner stress P constant, the winding tension A2 corresponds to a constant winding speed A1, the winding tension B2 corresponds to the winding speed B1, and the winding tension B2 corresponds to the winding speed C1. Winding tension C
2 are set respectively. In FIG. 2, this curved pattern 14 reduces the tension in a tapered manner according to the winding diameter, but it is not limited to this, and the winding internal stress becomes constant at a constant speed. , set to any pattern? can do. The tension control means 12 controls the winding speed A of the strip F, for example.
1 is selected, the motor 4 is controlled to the winding speed AI, and at this time, the conveying tension of the strip F detected by the winding tension detector 9 and the winding value from the winding diameter calculation means 10 are By correcting the tension according to the outer diameter and the speed from the tension correction means 11, '! A tension control command value is obtained so that the winding tension A2 in diagram J2 is achieved.

The tension setting device 5 is controlled based on this tension IJIXI specified value, but the winding speed is reduced at the outer diameter D1 and D2 as shown by the broken line of the winding speed Am, for example, when inspecting the surface of the strip F for failure. Then, based on the tension pattern 14 set in advance from the winding diameter and the winding tension, a tension reduction value in the winding tension A10 control state is determined and corrected, and a control command value is output, and the lower limiter comparison means 15 is via the tension setting device 5. The tension is lowered as shown by the broken line of the winding tension ^2, and the strip material F is
Keep the internal stress P constant. The tension IJ control command value outputted by the tension control means 12 is compared with the set value by the lower limiter comparison means 15, and if it is less than the set value, it is controlled by the set value, and if it is more than the set value, it is controlled by the command value. ．． As a result, as shown in FIGS. 2 and 3, the strip F
The winding tension A2 to C2 is selected according to the winding speed AX-Cl, and the winding tension of the strip F is set from the start S to the end E.
It is controlled so that it decreases over time. In each of these control states, when the surface of the strip F is inspected and the winding speed is reduced, the winding tension is also reduced.
The tension does not reach the area K where wrinkles occur as shown in Figure 3. In this case, when the winding tension of the strip F is below a certain level, the internal stress is weak and winding loosens, so the lower limiter comparison means 15 adjusts the tension to a predetermined value P.
I try not to go below 3. [Effects of the Invention] As described above, the winding tension control method and winding device of the present invention are capable of winding a strip based on a tension pattern that keeps the winding internal stress constant under a preset constant speed. Since the winding tension is corrected in response to speed fluctuations, the tension can be corrected in response to speed changes required for operation and work in constant speed winding control. can be done. Therefore, it is possible to wind the winding from the beginning to the end with a tension commensurate with the speed and winding diameter, and by correcting the tension due to speed changes, the internal stress becomes uniform, which prevents the occurrence of winding wrinkles, especially when winding at low speeds. I blame it on trying to prevent it.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing a winding device to which the present invention is applied, Figure 2 is a diagram showing the relationship between winding diameter, winding tension, winding speed, and internal stress, and Figure 3 is a diagram showing the relationship between winding speed and winding. A diagram showing the relationship between tension,
Figure 4 is a diagram showing conventional winding tension control. In the figure, reference numeral 1 is a take-up tension control device, 2 is a winding section, 3 is a winding section, 4 is a motor, 5 is a winding tension setting section, 8 is a conveying rotation speed detector, and 9 is a winding tension detector. , 1. O is a winding diameter calculation means, 11 is a tension correction means, 12 is a tension control means, 13 is a winding rotation speed detector, I4 is a tension pattern, and 15 is a lower limit comparison means. *9 Ikkushiya diagram

Claims (1)

[Claims] 1. A method for controlling the winding tension of a winding device that winds a strip around a winding core in the form of a roll, based on a tension pattern that keeps the winding internal stress constant at a preset constant speed. A winding tension control method comprising correcting the winding tension in response to fluctuations in the winding speed of a strip. 2. In a winding device that winds a strip into a roll around a winding core, there is a preset tension pattern that keeps the winding internal stress constant at a constant speed, and a system that responds to fluctuations in winding speed based on this tension pattern. A winding device comprising means for correcting winding tension. 3. The winding device according to claim 2, comprising a preset tension pattern that makes the winding internal stress constant at a constant speed, a winding diameter calculation means for recognizing the winding outer diameter of the roll of the strip, and a tension correction means for correcting the winding tension in accordance with the winding speed from the outside diameter of the roll; and a tension control means for further correcting the corrected winding tension in accordance with a preset tension pattern. A winding device characterized by having: