JPS6248281A - Controller for coater - Google Patents

Abstract

PURPOSE:To remove the slackening of paper by arithmetically operating the quantity of variation of speed from the quantity of change of load by mechanical disturbance and giving the arithmetically operated value as the quantity of compensation of speed on the starting of coating. CONSTITUTION:A coater coats a paper 20 with a coating liquid through an applicator roll 17. A DC motor 1 driving a main driving roll 21 is speed- controlled by a speed detector 3, a speed reference generator 4 and a control amplifier 5 by a power unit 2. When coating is started, an arithmetic memory storage 8 obtains the quantity of variation of speed Nd by load change torque on the basis of an output from a current detector 6 before the starting of coating and after the starting of coating. The quantity of variation of speed Nd and the quantity of compensation of the elongation section of paper on coating from an adjusting section 9 are transmitted over a speed compensation circuit 11 through an adder 10, and a compensation signal is outputted by a contact signal 12 at the starting of coating. A tension compensation amplifier 14 outputs a tension compensation signal on the basis of outputs from a tension detector 15 and a tension setter 16.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a control device for a coating machine.

[Technical background of the invention and its problems] Conventionally, coating (7, +, after paper threading, coating 1)
At the start of the process (2) Paper C2 The paper stretches to apply the coating liquid, and as a result, the paper becomes slack, so the C2 on-site operator operated the speed regulator to adjust the speed of the drive roll.

However, depending on the type of coating machine (2), the structure of the coating section, the type that makes contact with the blade, the applicator
There are various types, such as a type that brings the crawler into contact, but in all of them, an object is brought into contact with the object from the outside via the drive roll (1 slave), and a disturbance is applied to the drive roll's control C. Therefore, at the start of coating, the The speed fluctuation of the drive roll occurs not only due to the application of the coating liquid but also due to this disturbance.

[Objective of the Invention] It is an object of the present invention to predict the amount of speed fluctuation in advance using a control device (2) and provide this as a speed correction signal at the start of coating to eliminate the amount of slack in the paper.

[Summary of the Invention] Measuring load fluctuations due to mechanical disturbances as described above,
The control device (-) is equipped with a device that calculates the amount of speed fluctuation from the response frequency and machine specifications set, and when coating starts (-), this result is given as the speed correction amount. It is a control device for machine tools.

That is, the present invention provides a coating machine that detects and calculates not only paper draw but also speed changes due to load fluctuations at the start of coating and at the stop of coating.

This is a control device for a coating machine that performs correction using a speed correction circuit C unit that includes a speed fluctuation calculation section and a speed correction output section.

[Embodiments of the Invention] Next, a detailed explanation of the Niki invention will be given. The drawing shows the control device of the coating machine, which consists of the following components.

(a) Converter & 2 connected to AC circuit 6A C to convert AC power to DC power (b) DC motor 1 connected to 2 outputs DC circuit 2Ai 2 to converter (c) DC power! 1) Speed detector 3 that detects the rotational speed of the machine 1) AC circuit QA c) Current transformer 6 that measures the flowing alternating current (e) Current transformer 6Q] Secondary winding (= connected, Arithmetic unit 1η device 7 that computes and stores the variation (f) Arithmetic device 8 that computes the speed fluctuation of the DC motor 1 from the output signal of the arithmetic storage device f7 (g) Speed fluctuation signal 8A output from the arithmetic device 8 and A speed correction circuit 11 corrected by the adjustment signal 9A from the adjustment section 9. (a) Tension detector 15 that detects the tension of the paper pulled by the drive of the DC motor 1. (a) Preset the tension applied to the paper. Tension setting device 1
6) Setting Ig 16A from the tension setting device 16, tension detection signal 15A from the tension detector 15, and current transformer 6Z)
Tension correction amplifier 14 outputs a tension correction signal using secondary current signal 6B Compares speed detection signal 3A from QO speed detector 3 with speed reference signal 4A output from a predetermined speed reference generator 4, and performs tension correction. The comparator 13 corrects the tension correction command from the amplifier 14 and the speed correction command 11A from the speed correction circuit 11. (2) The output signal of the comparator 13 is amplified and the conversion device 2 (-
A control amplifier 5 that outputs a phase difference signal 5A, that is, a coating machine has an applicator roll 17 and a coater blade 1.
8, and a coating liquid 19 is applied to the paper 20 via an applicator roll 17. The main drive roll 21 is in t shift @
1, and speed control or speed control with tension correction is performed.

A DC motor 1 for the main drive roll of the coating section is connected to a speed detector 3 by a power supply 2. Speed reference generator 4. and control amplifier 5
The speed is controlled by the main circuit 1 from paper threading to the start of coating.
− is driven. The applicator roll 17 is raised and brought into contact with the main drive roll 21 using the paper as a medium, and then the coater blade 18 is brought into contact with the main drive roll 21 in the same manner (two times) to start coating.

Further, a current detector 6 is provided, and from this signal, the difference before and after the start of coating is calculated and stored in an arithmetic storage device 7ζ.

If the load fluctuation torque detected here is T, then the speed fluctuation amount Nd due to this can be calculated as C.

Here, GD2 is OD2 of the main drive roll 21. ωC is the speed y
This is the control response frequency.

Therefore, the arithmetic unit 8 (speed change of two levers) I11] is calculated, and this value and the previously known correction amount for paper elongation during coating are sent from the adjustment unit 9 to the speed correction circuit via the adder IO. 11
By applying this correction signal to the contact signal 12 at the start of coating, it is possible to eliminate slack in the paper during coating.

It should be noted that the calculation and storage device 7C for load fluctuations should contain an estimated value as an initial value, and the coating should be repeated. Rather than CU, the fluctuations should be corrected and rejuvenated and stored (less fluctuations than 2). Optimal value (can be converged to two).

Reference numeral 14 denotes a tension correction amplifier, which performs tension correction control based on the tension correction signal sent to the speed control system (2) based on the signals from the tension detector 15 and the tension setting device 16. During normal coating operation, tension correction control is performed manually. Control is performed as follows.

The above describes the correction circuit that prevents paper slack and load fluctuations at the start of coating, but also applies the same method when stopping coating.
jCan be controlled.

That is, during coating control, the contact signal 12 is in an open state, and the speed control and tension correction control C unit are operated. When coating is stopped, the elongation of the paper disappears and the main drive roll 21 The load suddenly becomes lighter (2).

Therefore, in this case, as described above, not only the decrease in paper elongation is adjusted in the adjusting section 9, but also the amount of load fluctuation is calculated and stored in the calculation storage device fit7 in order to suppress the increase in speed due to load fluctuation. , speed correction circuit 11 via arithmetic unit 8
A correction signal can be obtained from.

In this case, since tension correction control is being performed, this correction signal is held until the load stabilizes.

``Effects of the Invention'' The present invention (not limited to off-machine and on-machine f2) prevents paper flapping or paper breakage phenomenon at the start of coating and at the time of stopping coating, resulting in stable operation. can be done.

[Brief explanation of the drawing]

The drawing is a configuration diagram of a control device for a coating machine showing an embodiment of the present invention. 1... DC motor 2... Power supply device 3... Speed detector 4... Speed reference generator 5... Control amplifier 6... Current transformer 7... Arithmetic storage device 8
... Arithmetic device 9 ... Adjustment section 10 ... Adder 11 ... Speed correction circuit 13 ... Comparator 14
...Tension correction amplifier I5...Tension detector 16...
・Tension setting device agent Patent attorney Nori Chika Yudo Hirofumi Mitsumata

Claims (1)

[Claims] A control device for a coating machine comprising the following components. (a) A converter that is connected to an AC circuit and converts AC power into DC power (b) A DC motor that is connected to the output DC circuit of this converter (c) A speed detector that detects the rotational speed of this DC motor ( (d) A current transformer that measures the alternating current flowing in the alternating current circuit (e) An arithmetic storage device that is connected to the secondary winding of this current transformer and that calculates and stores changes in the alternating current (f) This calculation A calculation device that calculates the speed fluctuation of the DC motor from the output signal of the storage device (G) A speed correction circuit that corrects the speed fluctuation signal output from the calculation device and an adjustment signal from the adjustment section (H) The DC motor (1) A tension detector that detects the tension in the paper that is pulled by the drive of (2) A tension setting device that presets the tension applied to the paper (3) A setting signal from this tension setting device and tension detection from the tension detector A tension correction amplifier (1) that outputs a tension correction signal based on the signal and the secondary current signal of the current transformer. Compares the speed detection signal from the speed detector with a speed reference signal output from a predetermined speed reference generator. death,
A comparator that corrects the tension correction command from the tension correction amplifier and the speed correction command from the speed correction circuit (2) A control amplifier that amplifies the output signal of this comparator and outputs a phase signal to the conversion device.