JPH03211156A - Tension control method for sheet material - Google Patents

Abstract

PURPOSE:To keep the tension of a sheet material between rolls at a specified value by setting the ratio of respective speed setting value of plural units of electric motors corresponding to each roll with a specified equation when the sheet material, continuing in the longitudinal direction, is conveyed by plural pieces of rolls. CONSTITUTION:A consecutive film 17 is fed out of an unwinding roll 1 by each of delivery rolls 2, 3 and 4 and rolled on a take-up roll 5. The ratio of each speed setting value of respective electric motors 6, 7 and 8 driving these delivery rolls 2, 3 and 4 is set by the next equation. In brief, it is set down to a sectional area (a) of the film 17, a Young's modulus E, the i number gear ratio Di, a speed setting value Wi of the i number motor, and when Ti, Ti+1 are set to i and film tension T1, 2 between rolls of the i+1 to unwinding ten sion, thus it is set by this equation. Consequently, tension of the film among these rolls 1, 2, 3, 4 and 5 is kept up into the specified value, so that tension can be controlled without being restricted by processing surroundings of the film and system constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for controlling the tension of a sheet-like material (web) such as a film or paper.

(Prior Art) Conventionally, a sheet material processing/processing apparatus includes an unwinding roll that unwinds the sheet material and a plurality of delivery rolls that transport the sheet material to a processing/processing section.

There are take-up rolls that wind up the sheet material and a plurality of electric motors that drive these rolls.

In this sheet material processing/processing apparatus, the tension of the sheet material is controlled at the unwinding section, the processing/processing section 1 and the winding section. For example, in a film deposition device that deposits a metal film on a film, if the tension of the film decreases in the deposition section (processing/treatment section), wrinkles will form in the film and the quality of the product will deteriorate. It is necessary to hold the value above a predetermined value.

A conventional example of a tension control device for sheet material is shown in Fig. 3-4.

The tension control device shown in Fig. 3 includes delivery rolls (3) (4) and a variable-position dancer roll (
24) and a tension detector (25) are arranged, and the tension detection signal obtained by the tension detector (25) is sent to the dancer roll pressure control section (26).
) is sent to the dancer roll (24) to change the position of the dancer roll (24) and adjust the pressing force of the dancer roll (24) against the sheet material (17). 17) is maintained at a predetermined value.

The tension control device shown in FIG. 4 arranges a delivery roll (3), a variable-position delivery roll (4), and a tension detector (25) on the travel path of the sheet material (17). ) is sent to the roll pressure control unit (27).
The control signal obtained by the delivery roll pressure control section (27) is sent to the delivery roll (4).
), change the position of the sheet material (1) on the same delivery roll (4).
7) is adjusted to maintain the tension of the sheet material (17) at a predetermined value.

(Problem to be Solved by the Invention) In the conventional sheet material tension control device shown in FIGS. 3 and 4, the tension detection signal obtained by the tension detector (25) is fed back to ) to maintain the tension at a predetermined value, and cannot be applied when there are restrictions on the installation of the tension detector (25) due to the processing environment of the sheet material (17) or the configuration of the device. Also, tension detector (2
5) is required to open the roll, which poses a problem of high cost.

The present invention has been proposed in view of the above-mentioned problems, and its purpose is to be able to control the tension of a sheet-like material without being restricted by the processing environment of the sheet-like material or the configuration of the apparatus. Another object of the present invention is to provide a method for controlling the tension of a sheet-like material that can eliminate the need for a tension detector for opening a roll and reduce manufacturing costs.

(Means for Solving the Problem) In order to achieve the above object, the present invention drives a plurality of rolls by a plurality of electric motors corresponding to each roll,
When conveying a sheet material such as film paper that is continuous in the length direction, a is the cross-sectional area of the sheet material, E is the Young's modulus of the sheet material, and i-th gear ratio + Wi is the i-th motor's Speed setting value + Ti + i. , where i is the tension of the sheet material between the i+1st roll + TI+2 is the unwinding force, then the ratio of the speed setting values of each motor is expressed by the following formula: W , , a-E+Tt , , G2 ・
D2Wz a' E+T+,z Gt,+
'D+, +...■ The tension of the sheet-like material between each roll is maintained at a predetermined value.

In addition, the present invention provides speed settings for each of the electric motors when a plurality of rolls are driven by a plurality of electric motors corresponding to the same rolls to convey a sheet-like material such as a film or paper that is continuous in the length direction. The ratio of the values is determined by the above formula 0,
The tension of the sheet material between each roll is maintained at a predetermined value, and each speed setting value is corrected by comparing the tension calculated from the armature current detection value of the motor with the set tension.

(Function) As described above, the tension control force method for sheet-like materials of the present invention involves driving a plurality of rolls with a plurality of electric motors corresponding to each roll, and then pulling a film, paper, etc. that is continuous in the length direction. When conveying the sheet-like material, the ratio of the speed setting values of the respective electric motors is determined by the above-mentioned formula 0, and the tension of the sheet-like material between each roll is maintained at a predetermined value.

At this time, each speed setting value may be corrected by comparing the tension calculated from the detected value of the armature current of the motor with the set tension.

(Example) Next, an example of the configuration of a tension control device used to carry out the method of controlling tension of a sheet-like material of the present invention will be explained with reference to FIG.
(1) is an unwinding roll for unwinding sheet material (17);
(2) (3) (4) is a plurality of delivery rolls that transport the sheet material (17) to the processing/processing section, (5) is a winding roll that winds up the sheet material (17), ( 6) is an electric motor that drives the delivery roll (2), (7) is an electric motor that drives the delivery roll (3), (8) is an electric motor that drives the delivery roll (4), (9) (10) (1
1) is the speed detector of the electric motor (6) (7) (8), (12) (13) (14) is the speed detector of the electric motor (6)
(7) (8) Speed control device, (15) (16)
) is the arithmetic unit.

Next, the operation of the tension control device for sheet material shown in FIG. 1 will be explained in detail. Delivery forces T2, 3 and T3, 4 of sheet material (17) between delivery rolls (2) (3)
Speed setting values T2, 3 and T31 of electric motors (6), (7), and (8) corresponding to . and shall be determined in the following manner. However, the speed setting value T5,2 of the electric motor (6) corresponding to the unwinding force T8,2 of the sheet-like material (17) between the unwinding roll (1) and the delivery roll (2), and the delivery roll (4) ) and the winding roll (5), the winding tension T 4 of the sheet material (17)
+5 means that the tension is controlled and maintained at a constant value.

The range of tensions T2.3 and T3,4 that can be controlled by the tension control device shown in Fig. 1 is T2,3 ・ ・ ・ ・ ・ ・ ・■ Here, μm is the difference between the roll (1) and the sheet material (17). The friction coefficient G1 is the winding angle (r
ad). Furthermore, the equation 0 and the equal sign above are for the case where the roll and the sheet-like material (17) slip. For T2, 3 and T3.4 given within the range satisfying the above formula 0, the speed setting values of rolls (2) to (4) W2°W3. W
i is given by the following formula.

Wi a −E+T,,, G, −
G.

W3 a -E+TZ13 G2 ・
G2・ ・ ・ ・ ・ ・ ・ ・■ W4 a -E+Tay G3'
GzW3 a -E+T, 3 Ga ・
G4・ ・ ・ ・ ・ ・ ・ ・■ Here, a is the cross-sectional area of the sheet material (17), E is the Young's modulus of the sheet material (17) + Di is the i-th roll diameter +
Gi is the gear ratio. The above formula 00 gives the speed ratio, and by setting W3 using roll (3) as a speed mask, W2. You can get W4.

The above 0 formula is processed by the arithmetic unit (15), and the above 0 formula is processed by the arithmetic unit (15).
16), and the resulting values W2. Let Wi be the speed setting value, and this speed setting value W z
, W a to the speed control devices (12) (14), and the control signals obtained here are sent to the electric motors (6) (8) to control the rotational speed of the electric motors (6) (8) and thus the delivery roll ( 2) While controlling the rotational speed in (4), send the speed setting value W3 to the speed control device (13), send the control signal obtained here to the electric motor (7), and control the rotational speed of the electric motor (7). In turn, the rotational speed of the delivery roll (3) is controlled.

The tension of the sheet material (17) is maintained at a predetermined value.

Next, another example of the configuration of the tension control device used to carry out the tension control method for sheet material of the present invention will be explained with reference to FIG. 2. (1) is an unwinding roll that unwinds the sheet material (17); (2) (3) (4) is a plurality of delivery rolls that transport the sheet material (17) to the processing/processing section; (5) is a winding roll that winds up the sheet material (17); (6) is an electric motor that drives the delivery roll (2), (7) is an electric motor that drives the delivery roll (3), (8) is an electric motor that drives the delivery roll (4), (9) (10) (
11) is the speed detector of the electric motor (6) (7) (8), (12) (13) (14) is the speed detector of the electric motor (6)
) (7) Speed control device of (8), (15) (1
6) is the computing unit, (18) (19) is the armature current detector, (20) (21) is the computing unit, (22) (2
3) is the PI controller.

Next, the operation of the sheet material tension control device shown in FIG. 2 will be explained in detail. In this embodiment, in addition to being able to perform the same function as the tension control device shown in FIG.
Speed setting value W2. W4 can be corrected, and the effect of this correction will be explained next. The armature current detector (18) (19) detects the armature current 1az, I
a4 is detected, and this detection signal is sent to the arithmetic unit (20) (21
), and here, the estimated tension values T"2,3 and T3,4 between the delivery rolls (2) and (3) and between the delivery rolls (3 and 4) are calculated using the following equation.

T'2,3=TI,2-(I-□-1+,z) ・
kT□/(D2・02/2)...■ T' 3+ a =T4. s+(1,44L4)
・k T4/(D4・D4/2)...■ Here, IL2+ TL4 is the mechanical loss current kT□+k of the electric motor (2) (4) T4 is the torque constant. IL2
+ For TL4, use the armature current value measured in advance during no-load operation (during no-load operation without passing the sheet material (17)). Pr
Arithmetic unit (15) via controller (22) (23)
(16), where the estimated tension value T' 2 +
3 and T3, 4 and the tension setting values T2, 3 and T3, 4 to zero. Fix Wi.

(Effects of the Invention) As described above, the tension control method for a sheet-like material of the present invention involves driving a plurality of rolls with a plurality of electric motors corresponding to each roll, and then driving a film, paper, etc. that is continuous in the length direction. When conveying the sheet-like material, the ratio of the speed setting values of each of the electric motors is determined by the above-mentioned step 2, and the tension of the sheet-like material between each roll is maintained at a predetermined value, so that the processing environment for the sheet-like material is The tension of the sheet material can be controlled without being restricted by the structure of the device or the structure of the device. Furthermore, it is possible to eliminate the need for a tension detector between each roll, which has the effect of reducing manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a configuration example of a tension control device used to carry out the tension control method for sheet-like materials according to the present invention, and FIG. 2 is a system diagram showing another embodiment. 3 and 4 are side views showing a conventional tension control device. (1)...Unwinding roll, (2) (3) (4)...
... Delivery roll, (5) ... Take-up roll, (6)
(7) (8)...Electric motor. (9) (10) (11)...Electric motor (6) (7
) (8) speed detector, (12) (13) (1
4) Speed control device for electric motor (6) (7) (8) (15) (16) Arithmetic unit, (17)
... Sheet material, (18) (19) ... Armature current detector. (20) (21)...Arithmetic unit, (22) (23
)...PI controller.

Claims (2)

[Claims] (1) A film that is continuous in the length direction by driving multiple rolls with multiple electric motors corresponding to each roll,
When conveying a sheet material such as paper, a is the cross-sectional area of the sheet material, E is the Young's modulus of the sheet material, D_i is the i-th gear ratio, W_i is the speed setting value of the i-th motor, T
If _i_, _i_+_1 are the tensions of the sheet material between the i and i+1 rolls, and T_1_, _2 are the unwinding forces,
The ratio of the speed setting values of each electric motor is expressed by the following formula [1], that is, (W_i_+_1/W_2)=(a・E+T_i_i_
+_1/a・E+T_1_,_2)・(G_2・D_2
/G_i_+_1・D_i_+_1)・・・・・・[1
] A method for controlling the tension of a sheet-like material, characterized in that the tension of the sheet-like material between each roll is maintained at a predetermined value. (2) A film that is continuous in the length direction by driving multiple rolls by multiple electric motors corresponding to each roll,
When conveying a sheet-like material such as paper, the ratio of the speed setting values of each of the electric motors is determined by the above formula [1], the tension of the sheet material between each roll is set to a predetermined tension, and the electric motor of the electric motor is set to a predetermined tension. A tension control method for a sheet-like material, characterized in that each speed setting value is corrected by comparing a tension calculated from a child current detection value with a set tension.