JPS62205954A - Control method for dancer roller of paper feed device - Google Patents

Abstract

PURPOSE:To prevent meandering of a web, by retreating dancers roller behind fixed rollers and then making them approach to the fixed rollers in paper splicing to interrupt a travel of the web. CONSTITUTION:An accumulator 20 comprises a plurality of fixed rollers 24 pivotally held by a frame 1, a plurality or dancer rollers 23 pivotally held by a moving member 22, an air cylinder 25 for lifting and lowering the moving member 22, a chain 26 or the like. The dancer rollers 23 are made to approach to the fixed rollers 24 in a regular operation other than paper splicing so that a web W travels. In the paper sheet splicing the dancer rollers 23 are kept away from the fixed rollers 24 and then they are made to approach to fixed rollers 24 so that the travel of the web W is interrupted and a new winding paper is spliced to an old winding paper. As a result, meandering of the web fed from the winding paper can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for controlling dancer rollers of a paper feeding device that operates an accumulation rake having dancer rollers to stop the running of a web and performs paper splicing. It is something.

(Prior art) In web processing machines such as rotary printing presses, laminators, coaters, etc. that unwind webs and process them continuously, it is necessary to switch between new webs and old webs without stopping the machine in order to improve productivity. Generally, a paper feeding device that performs this is used.

Various types of paper feeding devices are used, one of which is an accumulator in which a fixed roller and a dancer roller are arranged, and the web runs between the fixed roller and the dancer roller. By placing this dancer roller close to the fixed roller during paper splicing, the web fed out from the web can be stopped without stopping the web discharged from the accumulator, and the new and old web can be spliced. There is a method (hereinafter referred to as the "stop-type paper splicing method").

(Problems with the prior art) However, in the above-mentioned paper feeding device using the stop splicing method, the web path in the accumulator section is very long, so the web meanders in the accumulator rake section, making it difficult to stabilize the web. There was a problem in that not only could it not be processed such as printing or laminating, but there was also a large loss of paper when it ran out.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and is capable of printing, laminating, etc. in a paper feeding device using a stop-type paper splicing method, in which the web fed out from the web does not meander and is always stable. An object of the present invention is to provide a dancer roller control method that can reduce paper loss when the paper runs out.

(Summary of the Invention) In order to achieve this object, the present invention operates an accumulator having a dancer roller that moves toward and away from a fixed roller to stop the running of the web unwound from the web, thereby splicing the new web and the old web. In paper feeding devices that perform
The web is run with the dancer roller close to the fixed roller except during paper splicing, and the dancer roller is moved close to the fixed roller during paper splicing.
A dancer of a sheet feeding device that moves the roller away from the fixed roller and then brings it close to the fixed roller to stop the running of the web and performs splicing of the new web and the old web.
A method of controlling a roller is provided.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic diagram showing an example of a paper feeding device for carrying out the method of the present invention. In the figure, 1 is a paper feed frame, 2 and 3 are brackets, 4 and 5 are shafts,
6 is a paper splicing section, 7 is a paper splicing frame, 8 and 9 are paper splicing rollers, 10, IL 12 and 14 are guide rollers, 13 is an acceleration roller, 20 is an accumulator, 21 is a guide frame, 22 is a moving member, 23 is a dancer roller, 24 is a fixed roller, 25 is an air cylinder, 26 is a chain, 27, 28 and 29 are sprockets, 40 is a control device, 43, 44 and 45 are encoders, 46 is a motor, and 47 and 48 are brakes. R1 and R2 are webs, and W is a web.

As shown in the figure, this paper feeding device includes a pair of paper feeding frames 1, brackets 2 and 3, a paper splicing section 6, and an accumulator 2.
0 and a control device 40. Brackets 2 and 3 are provided above and below an example of the paper feed frame l, and the brackets 2.3 are provided with rolls R1 and R2.
A shaft 4.5 attached to the shaft 4.5 is rotatably held, and a brake 47 is connected to the shaft 4, and a brake 48 is connected to the shaft 5. Paper splicing part 6
A splicing frame 7 is connected to the paper feed frame l in the middle of the bracket 2.3, and a splicing roller 8.9 and a guide roller 10 are rotatably held by the splicing frame 7.
．． 11, and a paper splicing mechanism (not shown) such as a cutter.

The accumulator 20 includes a large number of fixed rollers 24 that are rotatably held on the paper feed frame 1, a large number of dancer rollers 23 that are rotatably held on a moving member 22, an air cylinder 25 that moves the moving member 22 up and down, and a chain. 2
The moving member 22 is configured to move up and down along a guide (not shown) provided on a guide frame 21 connected to the paper feed frame 1, and
One end of the paper feed frame 6 is fixed to the paper feed frame 1, and the other end is fixed to the moving member 22. A sprocket 27.2 is held at the top of the paper feed frame l, a sprocket 29 is held at the tip of the piston rond of the air cylinder 25, a chain 26 is passed around these sprockets, and a sprocket 27 is held at the top of the paper feed frame l. Dancer roller 2 on the rotating shaft
An encoder 43 that detects the position of No. 3 is connected.

A guide roller 12 is provided between the paper splicing section 6 and the moving member 22,
An acceleration roller 13 and a guide roller 14 are rotatably held by the paper feed frame 1, and the acceleration roller 13 is connected to a driving motor 46 and an encoder 45 for speed detection. Further, a guide roller 14 is rotatably held by the paper feed frame 1 on the web W discharge side of the fixed roller 24, and an encoder 44 for speed detection is connected to the rotating shaft of the guide roller 14.

The control device 40 is composed of a dancer roller position control value y141 and a speed control device 42, and the input side of the dancer roller position control device 41 is encoders 44, 45 and 46.
is connected, the output side is connected to brakes 47 and 4, the input side of the speed control device 42 is connected to an encoder 45, and the output side is connected to a motor 46 and brakes 47 and 48.

Note that the dancer rollers 23 and the fixed rollers 24 are not limited to a large number of rollers arranged in the vertical direction as shown in the figure, and the number of rollers in the vertical and horizontal directions can be arbitrarily selected. can.

FIG. 2 ta+, [bl, (C1, (dl and +e+) are explanatory diagrams of the control method of the present invention in the apparatus shown in FIG. In the same figure, fbl, [C1 and fdl show the state during paper splicing.The control method of the present invention will be explained below based on the drawings.

First, as shown in FIG. 2 (al), in normal operation other than during paper splicing, the dancer roller 23 is controlled at the first control position P1 close to the fixed roller 24. Web W from the cent rolled paper R2
A new paper roll R1 is set on the bracket 2, and the tip on the feeding side is fixed to the splicing roller 8. Here, the first control position P1 is set slightly above the lowest end of the dancer roller 23, and the tension of the web W is controlled by the dancer roller position control value W41. That is, the air cylinder 25 shown in FIG.
The encoder 43 detects the position of the dancer roller 23, the encoder 45 detects the speed vl of the web W entering the accumulator 20, and the encoder 44 detects the speed vl of the web W discharged from the accumulator 20. v2 is detected and these detected values are input to the dancer-roller position control device 41.

The dancer roller position control device 41 is an encoder 44.4.
The moving speed of the dancer roller 23 is calculated from the speed vL v2 of the web W manually operated from 5, and based on this moving speed and the position data of the dancer roller 23 input from the encoder 43, the dancer roller 23 is always The brake 48 connected to the shaft 5 of the web R2 is adjusted so that the position P1 is at the first control position P1.

Next, when the diameter of the web R2 becomes smaller, the speed control device 4
2 drives the motor 46 to accelerate the acceleration roller 13. As a result, the moving member 22 rises along the guide (not shown) provided in the guide frame 21, and the
The roller 23 is in the second control position P as shown in FIG.
2, the acceleration of the acceleration roller 13 is stopped, the moving member 22 stops rising, and the web W is stored in the accumulator 20. Then, at this second control position P2, the dancer roller 23 is controlled, that is, the web W
The tension control is performed in the same manner as in the case of the first control position P1.

When the web R2 reaches a predetermined diameter, the speed control device 42 operates the brake 47 and decelerates the acceleration roller 13 via the motor 46. As a result, the speed of the web W is reduced, and the running of the web W, that is, the rotation of the web R2 is stopped. As the web W decelerates and stops, the second
As shown in Figure (C), the dancer roller 23 is connected to the moving member 2
When the web R2 stops rotating during its descent, a splicing device (not shown) of the splicing section 6 is activated, and the web W unwound from the web R2 is transferred to the splicing roller 8. The web W is joined to the tip of the set roll paper R1 and cut at the same time, and the web W is pulled out from the roll paper lit, completing the paper splicing.

This paper splicing method is similar to the conventional stop-type paper splicing method, so a detailed explanation will be omitted.

When the paper splicing is completed in this way, the speed control device 42
releases the brake 47, accelerates the acceleration roller 13 via the motor 46, rotates the web R1, and rotates the web R1.
From then on, the speed of the web W being fed out is increased. During this speed increase, the dancer roller 23 further descends via the moving member 22 and continues to release the stored web W, as shown in FIG. 2 fd).

Then, when the web W is discharged, the traveling speed v1 of the web W unwound from the web R1 is increased by the accumulator 20.
The speed of the accelerating roller 13 is controlled so that the speed vl reaches the speed v2 immediately before the dancer roller 23 reaches the lowest end. .

Next, even after the speed vl reaches the speed ν2, the speed of the accelerating roller 13 is increased, and the dancer roller 23 moves up via the moving member 22. When the dancer roller 23 reaches the first control position P1 as shown in FIG. 2 (fe), the acceleration of the acceleration roller 13 is stopped, and the rise of the dancer roller 23 is stopped. At this first control position P1, the dancer roller 23 is controlled, that is, the tension of the web W unwound from the web R1 is controlled.

Figure 3 shows the circumferential speed of the acceleration d-roller 13 and the dancer roller 2.
3 is a pattern diagram showing the temporal change state of the position,
In the figure, TI is during normal operation, T2 is when preparation for paper splicing starts, T3 is when preparation for paper splicing is completed, T4 is when paper splicing operation starts, ↑5 is during paper splicing, T6 is immediately after paper splicing is completed, TI is This shows the situation immediately after normal operation has resumed. Control of the positions of the acceleration roller 13 and the dancer roller 23 will now be described with reference to FIGS. 2 and 3.

At Tl, the circumferential speed of the accelerating roller 13 matches the operating speed VO, and the diameter of the zero roll R2 of the dancer rollers 2 and 3 at the first control position P1 becomes smaller as shown in FIG. At T2, the acceleration roller 13 is accelerated and then decelerated to the operating speed vO, and the dancer roller 23 moves to the second control position P2. At T3, the peripheral speed of the acceleration roller 13 matches the operating speed vO, and the dancer roller 23 is moved to the second control position P2. - The roller 23 is shown in FIG.
It is at the second control position P2 as shown in FIG. At T4 when the web R2 reaches a predetermined splicing diameter, the accelerating roller 13 is decelerated, at T5 the accelerating roller 13 stops and splicing is performed, and at T6 the accelerating roller 13 is accelerated. On the other hand, as shown in FIG. 2 (C1, (d+), the dancer roller 23 is
At T4, T5 and T6, it continues to descend to the lower limit position. Then, at TI, the acceleration roller 13 is slightly accelerated and then decelerated to the operating speed vO, and the dancer roller 23 is raised to the first control position Pl. Below, T1 to T
7 will be repeated.

The change pattern of the circumferential speed of the accelerating roller 13 shown in FIG. and controls the brakes 47,48.

Further, a paper break detector (not shown) is connected to the dancer roller position control device 41, and based on a signal from this paper break detector, the dancer roller control device 41 operates the air cylinder 25 shown in FIG. and dancer roller 2
3 at the first control position P1. As a result, when the web W breaks during operation, the tension of the web W becomes zero, so the dancer roller 23 rises, the web bus in the accumulator 20 increases, and the web W is unwound from the web, resulting in waste paper. prevent an increase in

Furthermore, the dancer roller control method of the present invention is applicable to stop-type splicing type paper feeders other than paper feeders having a mechanism for holding a web on a bracket 2.3 fixed to a paper feed frame 1 as shown in FIG. A paper device, for example, JP-A-55-40119 or JP-A-59-31 proposed by the present applicant.
Needless to say, the present invention can be applied to the paper feeding device described in Publication No. 244, which uses a pair of turret arms to hold a web, and rotates the turret arms to splice old and new webs, and to attach the web. do not have.

(Effects of the Invention) As described above, in the present invention, in a stop-type splicing type paper feeding device, during normal operation other than when splicing paper, the dancer roller is brought close to the fixed roller to run the web, and during splicing the web is moved. The dancer roller is moved back from the fixed roller and then brought close to the fixed roller to stop the running of the web and control the splicing of the new web and the old web, so the web unwound from the web does not meander. It is possible to perform printing, laminating, and other processing stably at all times, and to reduce the loss of paper when the paper runs out.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an example of a paper feeding device for carrying out the method of the present invention, and FIG.
d+ and tel are explanatory diagrams of the control method of the present invention in the apparatus shown in FIG. 1, and FIG. 3 is a Bakun diagram showing temporal changes in the circumferential speed of the acceleration roller 13 and the position of the dancer roller 23. 1... Paper feed frame 2.3... Bracket 4.5... Shaft 6... Paper splicing section 7... Paper splicing frame 8.9... Paper splicing roller 10.11.12. 14...Guide roller 13...
Acceleration roller 20...Accumulator 21...Guide frame 22...Moving member 23...Dancer roller 24...Fixed roller 25...Air cylinder 26...Chain 27, 28, 29...・Sprocket 40...Control device 41...Dancer roller position side? 11 device 42...
Speed control device 43, 44, 45...Encoder 46...Motor 47, 48...Brake R1, R2...Wrap paper W...Web Patent applicant Dai Nippon Printing Co., Ltd. Agent Patent attorney Ko Nishi Atsumi Figure 1

Claims (2)

[Claims] (1) In a paper feeding device that splices a new web and an old web by activating an accumulator having a dancer roller that moves toward and away from a fixed roller to stop the running of the web fed out from the web, except when splicing the paper. The dancer roller is brought close to the fixed roller to run the web, and during paper splicing, the dancer roller is moved away from the fixed roller and then brought close to the fixed roller to stop the running of the web, and the new web and old web are separated. A dancer roller control method for a paper feeding device, characterized in that the dancer roller is controlled to perform paper splicing. (2) The dancer roller, which is brought close to the fixed roller other than during paper splicing, is controlled to be locked when the web breaks paper. A dancer roller control method for a paper feeding device.