JPH02117556A - Tension control device - Google Patents

Abstract

PURPOSE:To enable execution of a smooth winding work by providing a roll rotation angle correction circuit to correct set tension so that a fluctuation in tension is prevented from production. CONSTITUTION:In a rotation angle correction circuit 16, a tension fluctuation amount responding to a rotation angle theta of a roll 2 detected by a rotation angle detector 17 mounted to an electric motor 1 is stored in a memory circuit 18, a set tension T0 is compared with a stored value by means of a comparing computing circuit 19, and a deviation amount by the one full turn of a roll is calculated and outputted as a correction signal I for the rotation angle thetathrough a feed forward circuit 20. By continuing the output until a line is stopped, a deviation between an actual tension T and set tension T0 can be suppressed to a low value. By preventing elongation, wrinkle, and winding displacement of a product due to a fluctuation in tension owing to eccentricity of a coil, stable operation is practicable.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is directed to a coil-shaped strip wound on an unwinding roll and to a winding roll at a predetermined tension. The present invention relates to a tension control device that controls tension to a constant level, and particularly relates to a correction circuit that prevents tension fluctuations due to eccentricity of a coil on the unwinding side.

(Prior art) Generally, in a processing line that reprocesses a strip-shaped product such as paper, film, or vinyl, the rolled product is set on an unwinding roll, processed through a processing section, and then transferred to a take-up roll. Winding is performed.

Tension control in this case is performed by controlling the field of the drive motor in proportion to the coil diameter and controlling the armature current to a value that corresponds to the required tension. If there is eccentricity in the roll or product, tension fluctuations will occur with each revolution of the roll, causing the product to break or stretch, causing wrinkles or misalignment of the product wound on the winding section. This may lead to a decline in quality and operational efficiency.

FIG. 4 shows the arrangement of general equipment in winder equipment used in the paper manufacturing industry. The paper material Q is guided to a guide roll 3, processed into a predetermined paper width by a slitter 4 as a processing means, and then processed by an electric motor 5.
, 6, the winding unit 2a is driven by the winding unit 2a to form a single winding coil 7.

The tension T of the web material Q is detected by a tension detector 8, and tension control is performed via the electric motor 1 so that the tension becomes a predetermined tension value TO.

FIG. 5 shows an example of a conventional tension control device.
The electric motor 1 is driven by the output of a power converter 9, and the power converter 9 is driven by the output of the paper web Q detected by the tension detector 8.
The phase is controlled via the tension control circuit 11, the current control circuit 12, and the phase control circuit 13 so that the tension T matches the tension value To set by the tension setting device IO,
The electric motor 1 is current controlled by the output.

Further, when the motor 1 accelerates or decelerates, the tension current is corrected by the acceleration/deceleration compensation circuit 14, and the motor current is detected by the current detector 15, which is negatively fed back to the current control circuit 12, thereby creating a current control minor loop. It consists of

(9! Problem to be solved by Ming) Here, if the unwinding coil 2 in Fig. 4 is eccentric as shown, the actual tension T is set according to the roll rotation angle θ as shown in Fig. 6. It fluctuates up and down with respect to the tension To, causing excessive tension or loosening of tension in the web material Q between the unwinding section and the winding section, which causes wrinkles and misalignment of the rolled product, resulting in product defects and operational problems. This results in a decrease in efficiency.

The present invention was made in consideration of the above-mentioned problems, and an object of the present invention is to provide a tension control device that suppresses tension fluctuations that occur every time a rewinding roll rotates, and enables smooth winding work. There is.

[Structure of the invention]

(Means and Effects for Solving the Problems) In order to achieve the above object, the present invention provides roll rotation that corrects the set tension so as to suppress tension fluctuations caused by eccentricity of the roll or coil in the unwinding section. An angle correction circuit is provided to ensure smooth winding operations.

(Example) An embodiment of the present invention is shown in FIG.

In FIG. 1, 16 is a roll rotation angle correction circuit connected to the input side of the tension control circuit 11 and inputs a coil eccentricity correction signal Δ; 17 is a roll rotation angle correction circuit connected to the unwinding roll and detects its rotation angle θ. This is an angle detector, and the rest is the same as the conventional one shown in FIG.

In addition, the second figure shows the details of the roll rotation angle correction circuit 16, and the rotation angle correction circuit 16 stores the amount of tension fluctuation corresponding to the rotation angle θ of the roll 2 using a rotation angle detector 17 attached to the electric motor 1. The comparison calculation circuit 19 compares the value stored in the circuit 18 with the stored value for the set tension To, calculates the amount of deviation due to one rotation of the roll, and corrects the current rotation angle θ via the feedforward circuit 20. Signal Δ■
and continues this until the line stops completely.

As a result, the deviation of the actual tension T from the set tension To can be kept small as shown in Figure 3, and this eliminates problems such as elongation, wrinkles, and miswinding of the product due to tension fluctuations due to coil eccentricity. This makes it possible to perform stable operations.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to prevent tension fluctuations caused by uneven rotation of the coil in the unwinding section, eliminate problems such as elongation, wrinkles, and misalignment of the product due to this, and continue stable operation. becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing one embodiment of the present invention, and Fig. 2 is a system diagram showing an embodiment of the present invention.
3 is a characteristic diagram showing an example of the operation of the present invention, and FIG. 4 is an example of the equipment arrangement of a winding machine to which the present invention is applied. FIG. 5 is a system diagram showing an example of a conventional tension control device, and FIG. 6 is a characteristic diagram showing an example of the operation of the conventional tension control device. 1.5.6... Electric motor 1a... Rewinding roll 2... Rewinding coil 2a... Winding section Q... Wrap paper material 3... Guide roll 4... Slitter 7... Rolled product 8・
...Tension detector 10...Tension setting device 12...Current control circuit 14...Acceleration/deceleration compensation circuit 16...Roll rotation angle correction circuit 18...Memory circuit 20...Feed forward circuit 9 ... Power converter 11 ... Tension control circuit 13 ... Phase control circuit 15 ... Current detection circuit 17 ... Rotation angle detector 19 ... Comparison calculation circuit (8733) Agent Patent attorney Boar Akira Matayoshi (and 1 other person) θ 13th θ 31o. Roll rotation circle θ Leap rotation circle L rotation warehouse θ Figure

Claims (1)

[Claims] In a band tension control device that rewinds a band wound into a coil around an unwinding roll at a predetermined tension by controlling the current of an electric motor, the tension fluctuation due to the eccentricity of the coil including the unwinding roll is controlled by the rotation angle of the unwinding roll. a memory circuit that stores information corresponding to the
The tension system is characterized by comprising a roll rotation angle correction circuit having a feedforward circuit that outputs the tension fluctuation value stored in the memory circuit as a correction signal for the tension control in accordance with the rotation angle of the rewinding roll. Control device.