JPS6234623Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Related Industrial Field) The present invention relates to an improvement of a drive device capable of coating a coating machine such as a laminator with a constant web tension.

(Prior art and its problems) Conventionally, the position of the impression cylinder and dancer roll was detected,
A drive device for a coating machine that controls this by feeding it back to a drive mechanism is known as disclosed in Japanese Patent Laid-Open No. 58-45769.

The above conventional technology will be briefly explained with reference to FIGS. 2 and 3. Figure 2 shows the coating section, where the rubber-lined impression cylinder 1 is connected to the coating roll 2.
It is designed to be able to move up and down. The web 3 is nipped by the impression cylinder 1 and the coating roll 2 and sent to the next process in the direction of the arrow, and the coating agent 5 stored in the pan 4 is scraped up by the coating roll 2 and coated. Ru. At this time, if a low viscosity coating agent layer is interposed between the surface of the coating roll 2 and the web 3,
A speed difference occurs between the running speed of the web 3 and the circumferential speed of the coating roll 2, and the web tension between the coating section and the next process cannot be kept constant. The web 3 is fed out not by the nip force between the rubber-lined impression cylinder 1 and the web 3.

The electric motor 6 is connected to the impression cylinder 1 via a clutch 7 and to the coating roll 2 via a variable speed gear 8. Here, the clutch 7 is provided to prevent the coating agent 5 from solidifying when the web 3 stops running. That is, when the web 3 stops, the clutch 7 is released, the impression cylinder 1 is raised, and the coating roll 2 is rotated at a low speed (hereinafter referred to as idling), the web 3 is rotated by rotating only the coating roll 2. This prevents the roller from being wrapped around the impression cylinder 1, and also eliminates the need for a separate idling motor, which was conventionally used. This clutch 7
When the web 3 is traveling, the line speed is detected and the webs are automatically connected or the impression cylinder 1 is lowered and connected.

The variable speed machine 8 is designed to cope with changes in the diameter of the plate cylinder when the diameter of the coating roll 2 or the impression cylinder 1 changes due to wear or polishing, or when the coating machine is used as a gravure printing machine. It is provided to adjust the coating amount by adjusting the circumferential speed or by changing the relative speed between the running speed of the web 3 and the circumferential speed of the coating roll 2.

FIG. 3 shows the control system of the coating section. Although a dryer and the like are provided after the coating process, the web pass line, roll arrangement, etc. are simply shown in this figure.

Now, in FIG. 3, 9 and 9' are speed detectors, 10 and 10' are motor control circuits, 11 is a dancer roll position detection and calculation circuit, 12 is an impression cylinder diameter correction circuit, 13 is a speed setting device, and 14 1 is an idling speed setting device, 15 is a line operation control circuit, 16 is an idling operation control circuit, 17 is a coating section, 18 is a next process section, 19 is a speed signal, 20 is a correction (feedback) signal, and 21 is a dancer roll. be.

The web running speed signal from the line speed detector 9' installed in the next process section 18 that determines the speed of the coating line is sent via the impression cylinder diameter correction circuit 12 to determine the diameter of the impression cylinder used and the running speed of the web. is converted into a speed signal 19 commensurate with the speed signal 19, which is added to and subtracted from the dancer roll position correction signal 20 obtained through the dancer roll position detection and calculation circuit 11, and is used as a speed command for the coating section electric motor 6, and is set as a known speed. Speed feedback control is performed by the detector 9.

Here, the line operation control circuit 15 closes during the above-mentioned line operation, guides the speed signal 19 to the coating section electric motor control circuit 10, and idling operation control circuit 1
6 is closed during idling operation and also applies an idling speed command to the motor control circuit 10.

This conventional coating unit drive device is constructed as described above, and during operation, it sets the impression cylinder diameter to be used with the impression cylinder diameter setting device, and generally uses the variable speed machine 8 to set the impression cylinder diameter to be used with the impression cylinder diameter setting device. The circumferential speed of the coating roll 2 is adjusted to be equal to the circumferential speed of the impression cylinder 1.

When the web 3 is accelerated from a speed of 0 and running of the web is detected by the voltage level of the speed detector 9' of the electric motor 6' which determines the speed of the coating line, the clutch 7 is automatically engaged and the impression cylinder is 1 is a tension control operation using dancer roll feedback. Therefore,
Even when the impression cylinder 1 is raised, the web 3 can run stably, and even when the impression cylinder 1 is lowered and the coating process begins, the web tension remains stable and uniform coating is achieved without fluctuations in the elongation rate. I can do engineering. When starting the engine with the impression cylinder 1 lowered, the clutch is already engaged and the engine can be started under tension control.

On the other hand, when stopping the running of the web 3, lower the web speed and continue to decelerate to 0 speed;
Alternatively, when the web speed falls below a certain low speed level, the impression cylinder is automatically raised, the clutch 7 is disengaged, and idling operation can be started.

Therefore, instead of operating the coating roll 2, which has slippage between it and the web 3, at the same speed as the electric motor 6' in the next process that determines the speed of the coating line, the impression cylinder 1 that can hold the web 3 well is used. Since uniform speed operation is performed by the feedback signal from the dancer roll 21, the tension of the web 3 can be easily set, and the web tension is stable during coating, with little variation in the web elongation rate and uniform coating. It is now possible to apply it.

(Problems to be Solved by the Invention) In the conventional apparatus as described above, when the diameter of the rubber-lined impression cylinder 1 changes due to wear, polishing, etc., the surface periphery of the impression cylinder and coating roll changes. The speed changes and the coating amount changes. For this reason, it is necessary to adjust the rotation speed of the coating roll using a variable speed mechanism so as to keep the circumferential speeds of the impression cylinder and coating roll constant. At this time, with conventional equipment, the correction (feedback) signal from the dancer roll is constantly received, so the surface circumferential speed of the impression cylinder and coating roll constantly changes, which not only takes time to adjust the circumferential speed, but also makes accurate measurement difficult. The disadvantage was that it was not easy.

(Means for solving the problem) The impression cylinder is driven by an electric motor through a clutch, and the coating roll is driven by the electric motor through a variable speed mechanism that can be adjusted with respect to the circumferential speed of the impression cylinder, and The position of the dancer roll provided between the coating section and the next process section is detected, and this is fed back to the control circuit of the electric motor to control the drive mechanism of the impression cylinder and coating roll, and further a feedback control signal is sent. By installing a selective cutoff device, the correction signal circuit is cut off when adjusting the circumferential speed, preventing the correction signal (feedback control signal) from the dancer roll from entering, allowing accurate circumferential speed adjustment. This is what I did.

(Example) This will be explained with reference to FIG. In FIG. 1, the same components as those of the conventional device shown in FIG. 3 are designated by the same reference numerals, and explanations thereof will be omitted. Reference numeral 22 denotes a circuit opening/closing device provided in a circuit that sends a correction (feedback control) signal 20 from the dancer roll obtained through the dancer roll position detection and calculation circuit 11, and this device controls the circumferential speed adjustment of the coating roll. At times, the correction signal 20 is cut off to prevent speed changes caused by the correction signal 20.

Generally, in coating machines such as laminators (excluding printing machines), the diameter of the coating roll is constant, so if the rotation speed of the coating roll 2 is detected by the rotation speed detector 23, the arithmetic circuit 24 determines the surface Since the circumferential speed can be determined, there is no need to measure the circumferential speed of the roll surface using a tachometer or the like. Reference numeral 25 denotes a circumferential speed indicator, and adjustment can be made easily and accurately by making adjustments while looking at the display on this indicator 25. In addition, if the coating roll diameter changes, the coating roll diameter correction circuit 26
By providing this, the circumferential speed can be detected in the same way.

(Effect of the idea) Correction of feedback control (feedback)
Since the cutoff device for the signal 20 is provided, the correction signal can be cut off when adjusting the circumferential speed of the coating roll, and the adjustment can be made without being confused by changes in the surface circumferential speed of the impression cylinder and the coating roll caused by the feedback signal. Accurate circumferential speed adjustment is now possible.

[Brief explanation of the drawing]

FIG. 1 shows a control circuit of a coating machine according to the present invention. Second
The figure shows the coating section of a conventional coating machine. Figure 3 shows the control circuit of a conventional coating machine. In the figure; 1...impression cylinder, 2...coating roll,
3...Web, 4...Bread, 5...Coating agent, 6...
...Electric motor, 7...Clutch, 8...Variable speed gear, 9
... Speed detector, 10 ... Motor control circuit, 11
...Dancer roll position detection and calculation circuit, 12
... Impression cylinder diameter correction circuit, 13 ... Speed setting device, 14
... Idling speed setting device, 15 ... Line operation control circuit, 16 ... Idling operation control circuit, 17 ... Coating section, 18 ... Next process section, 19 ...
... Speed signal, 20 ... Correction signal, 21 ... Dancer roll, 22 ... (Feedback signal) cutoff device, 23 ... Rotation speed detector, 24 ... Arithmetic circuit, 25 ... Display, 26 ... Coating roll diameter correction circuit.

Claims (1)

[Claims for Utility Model Registration] [1] The impression cylinder is driven by an electric motor through a clutch, and the coating roll is driven by the electric motor through a variable speed mechanism that can be adjusted with respect to the circumferential speed of the impression cylinder. , detects the position of the dancer roll provided between the coating section and the next process section, and feeds this back to the control circuit of the electric motor to control the drive mechanism of the impression cylinder and coating roll, and also sends a feedback control signal. A drive device for a coating machine, characterized in that it is provided with a shutoff device that selectively shuts off. [2] The drive device for a coating machine according to claim [1], characterized in that it is provided with a detection and display device for the number of rotations of the coating roll.