JPH01247366A - Device for detecting initial diameter of unwind roll - Google Patents

Abstract

PURPOSE:To improve a working property by sticking a reflecting seal on a new roll during the paper passing operation of the new roll or a slowmotion operation for changing the frame of the new roll and automatically detecting an initial diameter. CONSTITUTION:First, an operator sticks a reflecting tape 94 on the paper end (or sticking point) of a new roll and carries out a paper passing slowmotion operation of an unwind roll 10. At the time of carrying out the paper passing operation of a new roll, the maximum diameter of the unwind roll 10 is temporarily inputted into the diameter operating memory value of a programmable controller 70. As the reflecting tape 94 passes through first and second position detectors 91, 92 during the paper passing operation, these detectors 91, 92 are operated and, based on these operation signals, an initial diameter is operated by the initial diameter operating circuit 93 of the controller 70. In this case, the winding diameter D is operated by, D=L/(pi.n0) from the count value (n0) of a pulse signal from a pulse generator PG31 installed on an unwinder driving motor DM30 and the distance (L) between both detectors 91, 92. After completing the paper passing operation, this value is replaced with the temporary value in a diameter operating circuit 71.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to an initial diameter detection device for an unwind roll of a winder facility in the field of paper manufacturing industry.

(Prior art) Conventionally, in order to convert the surface speed V of the unwind roll, V=πn-D is obtained by multiplying the rotation speed n of the unwind roll and the radius of the unwind roll in a multiplier 52. . In this case as well, it is necessary to measure the new roll diameter of the unwind roll in advance by an operator, set it using an initial diameter setting device, and match the diameter memory value to the new roll diameter.

(Problem to be solved by the invention) When replacing an unwind roll with a new roll, the worker always measures the diameter of the new roll in advance with a measuring device and sets the initial diameter on the control device, etc. manually. Since it is a lot of work, measurement errors and setting errors are likely to occur, and workability is poor.

The purpose is to eliminate the above-mentioned manual work errors and to improve work efficiency.

[Structure of the invention]

(Means for solving the problem) In order to solve the above-mentioned problem, the initial diameter is automatically detected during normal work. In other words, during slow operation for feeding a new roll or changing the frame of a new roll, the reflective sticker attached to the new roll passes between two detectors kept at a specified distance. Number of rotations of the mouth wheel n. The radius of the new roll is calculated from this count value and the distance between the two detectors.

D=L/(π×n0) (Function) The new roll diameter (D) can be found naturally during normal work by the above-mentioned initial diameter detection method.

(Example) FIG. 1 shows an embodiment of the present invention.

The paper unwound from the unwind roll 10 passes through each guide roll 22, is divided into a plurality of rows by a slitter (not shown), and is wound alternately on both sides of the main roll 20 to form a take-up roll 21.

As a drive device, the unwind roll 10 is a DC electric fi
30, pulse transmitter 31 and thyristor Leonard 50
Consists of. In addition, the main roll 20 is powered by a DC motor 40,
It is composed of a pulse transmitter 41 and a thyristor Leonard 60.

On the other hand, the control system controls the speed of the main roll 20 during normal operation.
Operate the unwind roll with tension control.

For the speed reference of the main roll 20, input the partial pressure value of the line speed setting device 82 into the programmable controller 70, perform speed reference calculation using the software of the programmable controller 70, and set the step input to a figure-8 ramp function change. and outputs the signal as a speed reference for the main roll 20 driving thyristor Leonard 60. The tension standard for the unwind roll 10 is determined by inputting the partial pressure value of the tension setting device 80 into the programmable controller 70, and using the software of the programmable controller to calculate the actual tension return value from the tension detector 32 and the partial pressure of the tension setting device 80. An adder circuit 73 compares the value (ie, tension setting value), an operational amplifier circuit 74 amplifies the error, and an adder circuit 75 adds the tension setting value and the error amplified signal. Since this added signal is the surface tension reference T of the unwind roll lO, it is necessary to convert it into the torque reference τ of the DC motor 30. Therefore, the diameter of the unwind roll lO calculated by the diameter calculation circuit 71 is multiplied by the tension reference in the multiplication circuit 72 to obtain =TXD, and this torque reference is output as the torque reference for the drive thyristor Leonard 50 of the unwind roll IO.

A diameter calculation circuit 71 created by software of a programmable controller uses the line speed V detected from the pulse transmitter 41 attached to the DC motor 40 for driving the main roll 20 and the pulse transmission attached to the DC motor 30 for driving the unwind roll 10. The machine 31 calculates the diameter of the unwind roll from the rotation speed n of the unwind roll as D=V/(πX
n) is constantly and periodically determined, and changes in the diameter are captured moment by moment.

Also, when the unwind roll 10 runs out of paper to unwind, the winder is temporarily stopped, a new unwind roll 10 is placed, and the end of the previous paper is pasted with tape. When the bonded portion is brought to the roll side and wound around the take-up roll 21, the line is stopped and the frame of the take-up roll 21 is changed.

In terms of operation, when a new unwind roll 10 is installed, the diameter of the new roll is set using the initial diameter setting device 81, and then
It is necessary to perform an operation to change the diameter value stored in the diameter calculation circuit 71 of the programmable controller 70 to the new roll diameter.

By replacing this memorized value, the new roll starts operating with the correct surface tension.

On the other hand, when operating a completely new winder, when the unwind roll 10 is mounted, the initial diameter of the unwind roll IO is set with the initial diameter setting device 81, and after adjusting the diameter memory value to the new roll diameter, Slowly move the unwind roll forward,
The leading end of the paper is fed into the paper path, and the leading end of the paper comes to the main roll 20 side and is further fed out to a length that can be sufficiently wound around the winding roll 21. Pause the winder here,
The leading end of the paper is wound onto a take-up roll and the line is operated at normal line speed.

In order to slowly rotate the unwind roll 10 in the forward direction, the relay contact 54 is operated to the speed control side, and the speed operational amplifier 5
Take advantage of 1 to cut off the torque control side.

The speed reference of the speed operational amplifier 51 is the line speed reference (the output of the speed operational amplifier circuit 76 of the programmable controller), and the line speed reference and the unwind roll 10
The speed control is performed by comparing the speed feedback obtained by converting the rotation speed n to the surface speed V of the unwind roll in an adder 53, amplifying the error in a speed operational amplifier 51, and applying it to the thyristor Leonard 50 as a torque reference. I do.

Next, a first position detector 91 is attached to the paper path of the winder on the side closer to the unwind roll 10, and a second position detector 91 is attached on the side closer to the take-up roll 21. These position detectors utilize, for example, reflective phototubes.

The operation signals of these two position detectors are input to the programmable controller 70 and used as operation signals of the initial diameter calculation circuit 71. A pulse signal from the pulse transmitter 31 on the unwind roll 10 side is further input to the initial diameter calculation circuit 71. Further, the internal program of the initial diameter calculation circuit 71 is configured as shown in FIG. That is, at the start (the start of paper feeding or the start of slow movement), the frame change gradual movement determination circuit 101 determines that the frame change slow movement operation is being performed, and thereby waits for the operation of the first detector. The first detector operation detection circuit 102
When the operation of the detector is detected, the pulse counting of the pulse counter 103 is started. Next, when the second detector operation detection circuit 104 detects the operation of the second detector, the pulse counter 103
Stop counting.

Next, in the winding diameter calculation circuit 105, the count value n0 of the pulse counter
And the winding diameter is calculated from the distance between the detectors (L is fixed): D=L
/(z−n,,). This calculation result is set in the diameter calculation circuit 71 by the diameter setting circuit 106.

In the above-described configuration, first, a worker applies a reflective tape to the paper end 94 (or bonding point) of a new roll and slowly operates the unwind roll to feed the paper.

When a completely new roll is to be passed through, an air passing device (not shown) is used, and the end of the paper sent out from the unwind roll is passed through this paper passing device along a paper path.

Further, when changing the frame of a new roll, the paper end of the new roll and the paper end of the old roll are pasted together and the joining point is moved by slow movement.

Here, when passing a new roll, temporarily enter the maximum diameter value of the unwind roll in the diameter calculation memory value,
By passing the paper with this diameter, it is possible to safely pass the paper.

During this paper feeding, the reflective tape attached to the edge of the paper (or the bonding point) passes through each position detector, thereby operating each position detector. Based on this operation signal, the initial diameter is calculated in the initial diameter calculation circuit 93 of the programmable controller 70, and upon completion of paper feeding, the calculation result is replaced with a temporary value in the diameter calculation circuit 71, so that an accurate initial diameter can be obtained during the next normal operation. You can start operation with the diameter.

〔Effect of the invention〕

Workers can automatically detect the new roll diameter by simply applying reflective tape to the paper edge (or pasting point), improving work efficiency and eliminating measurement and setting errors.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an initial diameter detection device showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the operation of a programmable controller. 91...Position detector 92...Position detector 9
3...Initial diameter calculation function 94...Reflective tape Figure 1

Claims (1)

[Claims] A first position detector and a second position detector attached to the paper path of the paper winder equipment, a pulse transmitter attached to the unwinder drive motor, and an output signal of the first position detector and the second position detector. An initial diameter detection device for an unwind roll, comprising a counting circuit that counts pulse signals of an unwinder motor between output signals of a position detector, and a winding diameter calculation circuit that computes an unwinder diameter from the counted value of this counting circuit.