JPH0147232B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a coating machine in a laminator. When applying a coating to a web, it is important to keep the web tension constant during application in order to reduce fluctuations in the elongation rate of the web and to make the coating amount uniform.

The present invention feeds back the web tension to a variable speed device (electric motor, powder clutch, etc.) that drives the impression cylinder of the coating section to stabilize the web tension during coating, and improves the operability of the coating machine. The purpose is to simplify the mechanism. It is also intended to enable the coating machine to be used as a gravure printing machine.

FIG. 1 schematically shows the coating part according to the present invention,
An impression cylinder 1 provided with a rubber lining can be moved upwardly and downwardly toward and away from a coating roll 2. The web 3 is nipped by the impression cylinder 1 and the coating roll 2 and conveyed 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 the web 3 is coated on. 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 will occur between the feeding speed of the web 3 and the circumferential speed of the coating roll 2, and the coating part and the next The web tension between processes cannot be kept constant.

Therefore, if we look at the conventional drive system of the coating section, we can see the following.
Methods (1) and (2) are seen.

(1) As shown in Fig. 3, the coating roll 2 is driven by an electric motor 6, and the impression cylinder 1 is not driven but driven.

(2) As shown in Fig. 4, the coating roll 2 is driven by an electric motor 6, and the impression cylinder 1 is driven from the drive shaft of the coating roll 2 via a transmission or a variable speed machine 8, or a powder clutch, etc. Drive using the constant slip torque characteristics of

In the conventional drive system as described in (1) and (2) above, the coating roll 2 is considered to be the main drive, and the impression cylinder 1 is the secondary drive. In case (1), there is slippage between the web 3 and the coating roll 2 due to the above-mentioned causes, and since the impression cylinder 1 is driven by the web 3 and the coating roll 2, there is a slippage during coating. This increases web tension and also causes instability. In the case of (2), in addition to the instability of the web tension due to the above-mentioned slippage, if the outer diameter changes due to wear or abrasion of the impression cylinder 1, it may be necessary to change the gear ratio or use a powder clutch. In addition, in the case of mechanical shifting, the response to tension is delayed, tension adjustment is difficult, and the tension becomes unstable due to backlash of the transmission.

The present invention does not rely on the nip force between the impression cylinder 1 and the coating roll 2 to transport the web 3 in the coating section as in the past, but instead uses the frictional force between the rubber-lined impression cylinder 1 and the web 3. This will be explained in detail below.

In FIG. 1, an electric motor 6 is connected to an impression cylinder 1 via a clutch 7 and to a coating roll 2 via a variable speed machine 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 winding around the impression cylinder 1, and also eliminates the need for a separate idling motor, which was conventionally used. When the web 3 is traveling, the line speed is detected and the webs are automatically joined or the impression cylinder 1 is lowered and joined.

The variable speed machine 8 is configured to adjust the circumference in order 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 abrasion, or when the coating machine is used as a gravure printing machine. It is provided to adjust the coating amount by adjusting the speed or by changing the relative speed between the running speed of the web 3 and the circumferential speed of the coating roll 2. Of course, an electric motor may be used instead of the variable speed machine 8.

Referring to FIG. 2, the control system is shown.
Note that a dryer etc. is installed after the coating process,
In this figure, the web pass line, roll arrangement, etc. are simply depicted.

Now, in Fig. 2, 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, 14 is an idling speed setting device, 15 is a line operation control circuit, and 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 signal, 21
is a dancer role.

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 dancer roll position, and then sent through a dancer roll position detection and calculation circuit 11 (the circuit may be composed of a tension detector and its calculation circuit) to the obtained dancer roll position correction signal 20. The added and subtracted value is used as a speed command for the coating section electric motor 6, and the well-known speed detector 9
Speed feedback control is performed by

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.

The coating unit drive device of the present invention is as described above, and in operation, it sets the impression cylinder diameter to be used with the impression cylinder diameter setting device, and generally controls the coating roll by the variable speed machine 8. The circumferential speed of the impression cylinder 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 tension control operation based on dancer roll (or tension detector) 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 elongation rate fluctuations are achieved. Can be coated without scratches. Note that when starting with the impression cylinder 1 lowered, the clutch is already engaged and the starting can be performed by tension control.

On the other hand, when stopping the running of the web 3, the web speed can be reduced and the speed can be directly reduced to 0 speed, or when the web speed drops below a certain low speed level, the impression cylinder is automatically raised and the clutch 7 is disengaged. At the same time, it is also possible to start idling operation.

As described above, (1) 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, it is possible to Since the impression cylinder 1, which can be held well, is operated at a uniform speed by feedback from the dancer roll 21 (or tension setting device), it is easy to set the tension of the web 3, and the web tension is stable during coating. It has good coating properties, has little variation in web elongation rate, and can be coated uniformly.

(2) By inserting the clutch 7 between the impression cylinder 1 and the electric motor 6, the web 3 does not wrap around the impression cylinder 1 even during idling operation, improving operability. Further, there is no need to install a separate electric motor for idling, and the mechanism becomes simpler.

(3) Since a variable speed machine 8 is also present from the electric motor 6 and drives the coating roll 2, the circumferential speed can be easily adjusted even if the coating roll diameter changes, and it can also be used as a gravure printing machine. On the other hand, by providing a relative speed between the web 3 and the coating roll circumferential speed, the amount of coating can be adjusted.

[Brief explanation of drawings]

FIG. 1 shows a coating section of a coating machine according to the present invention, FIG. 2 shows a control circuit of the coating machine, and FIGS. 3 and 4 show a drive system of a known 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: Electric motor control circuit, 11: Dancer roll position detection and calculation circuit, 12: Impression cylinder diameter correction circuit, 1
3: 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 role.

Claims (1)

[Scope of Claims] 1. The coating section and the next process section are connected via a dancer roll 21, the coating section is composed of an impression cylinder 1 for conveying the web 3 and a coating roll 2, and the impression cylinder 1 is capable of approaching and separating from the coating roll 2, and the electric motor 6
The coating roll 2 is driven by the same electric motor 6 through a variable speed machine 8 that can adjust the circumferential speed of the impression cylinder 1, and is installed in the next process section. The web running speed signal from the line speed detector 9' is converted via the impression cylinder diameter correction circuit 12 into a speed signal 19 appropriate for the diameter of the impression cylinder used and the running speed of the web, and the position of the dancer roll 21 is The speed command for the coating unit electric motor 6 is obtained by adding and subtracting the dancer roll position correction signal 20 obtained through the detection and calculation circuit 11, and the speed is feedback-controlled by the speed detector 9. Features: Coating machine drive device. 2. The drive device for a coating machine according to claim 1, wherein the dancer roll is used as a tension detector.