JPS5847747A - Web guide device - Google Patents

Abstract

PURPOSE:To obtain high accuracy in continuous paper printing device, by holding both edges of movable end plates by a plurality of pushing plates for fixing a frame so that the plate can be freely moved in a moving plane, and preventing the movement of guide rolls in the part other than the moving plane. CONSTITUTION:The web 2 passes between scanners 8a and 8b which are mounted on a scanner bar 9. The deviation is detected by the difference in outputs of two light receiving elements in a pulse modulation system utilizing a light emitting diode. Staggering movement is corrected by the movement of a guide roll unit 6 based on the signal. As for guide roll unit 6, the parallel guide rolls 1a and 1b and a moving beam 20 are attached to movable end plates 21a and 21b. The roll unit is freely moved by a pivot 22 with respect to a supporting beam 23. Fixing end plates 25a and 25b are fixed to both sides of the supporting beam 23, and supported by the four pushing bearing 26 so that they can be freely moved only in the specified moving plane. The oscillation in the direction perpendicular to the plates can be perfectly prevented. Therefore, the guide rolls can be movably supported highly accurately and highly stably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for cleaning the edges of a web in an intermediate process.
, or if you want to align the ins and send them to the next process,
This is 'b' regarding a device for guiding the guy 1-roll so that the web running position 11 is constant by swinging the roll.

For example, in a wear printing device, the web (continuous paper) is fed from a paper feed coil to the printing machine body and printed. (Otherwise, the slitter in the next process or multi-color printing will cause the C1 design to be cut or the color shift of the design will occur.) In addition to these uses, There are many cases where it is desired to accurately keep track of the running position of continuous sheets.

In such cases, the S! has been used. In principle, 11. shown in FIGS. 1A and 1B. uni, two parallel guide rolls 1a, 1b (
These two are swingably supported within a plane formed by the idle roll central axis (the swing axis is indicated by the symbol X), along which the sea urchin 12 is made to travel. Note that the rolls not indicated by numerals 3 and 4 are simply fixed rolls for changing direction. Therefore, if the parallel guide rolls 1a and 1b are swung by an angle θ, one web 2 will be displaced by a distance d and travel accordingly. Therefore, it is sufficient to change this swing angle θ so that the exiting web position remains constant. In principle, this is sufficient. However, in practice, a major problem is how to hold the two parallel guide rolls 1a and 1b so that they can swing freely. This is because, in the case of printing@ machines, the positional accuracy of the web has a major impact on printing quality, and the setting accuracy between the rolls on which the web runs must be within approximately S/100m, which is a strict requirement. Because it has to be done. -However, when the web runs, the tension tends to cause the guide rolls 1a and ib to move in the direction perpendicular to the swinging plane (1 in Fig. 1A, indicated by the symbol p), resulting in an error in setting the web position W1. 【there was. In order to reduce such defects, it is necessary to make the pivot part of the swinging part and its bearing - a very large structure laterally, and the longer the length of the guide roll, the larger and stronger the swing support mechanism is required. Furthermore, even with such a large structure, it was impossible to completely prevent the undesirable swinging of the guide roll to the right.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art as described above and to provide a web guide device that is small in size and equipped with a highly accurate guide roll swing support mechanism.

In order to achieve this purpose, the device according to the present invention has two
Both ends of the parallel book guide roll are attached to movable end plates fixed to both ends of a swinging beam, and the swinging beam is swingably attached to a support beam at its center, and the movable end plate Both edges of are held movably only within the oscillating plane by a multi-layer presser member fixed to the frame.
The guide roll is configured to prevent movement of the guide roll in directions other than within the swing plane. With that, guide 1゛1
- Regardless of the length of the web or the tension of the web, the mechanism is extremely simple and has been devised to ensure stable operation without play.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 2 is an oblique view of one embodiment of the web guide device according to the present invention, and FIGS. 3 and 4 show the main parts thereof. This device includes a scanner mechanism 5 for detecting misalignment of the web 2, a guide roll unit 6, and a rotatably supported fixed roll 3.4 for interfacing the guide roll unit 6 with other web running systems. ,
It consists of a side frame 7, etc.

First, the scanner mechanism 5 will be explained.

Scanner bar 9 on which scanners 8a and 8b are mounted
is supported by a side frame 7 so as to be movable within a certain range in its longitudinal direction, and a motor 10 for driving the scanner bar 9 is mounted on one side frame.
is installed.

A threaded rod 11 is engaged with the rotating shaft of the drive motor 10 via a gear or the like, and the threaded rod 11 is screwed into a female threaded member 12 fixed to the scanner bar 9. Both scanners 8a, 8b are positioned manipulatively by handles on either side of the scanner bar 9. scanner 3a
, 8b is U-shaped so that the web 2 can pass therebetween, and a light emitting diode and a light receiving element (for example, a photodiode) are provided so as to face each other with the web 2 interposed therebetween. Therefore, by operating the external switch to operate the drive motor 10, the scanner position can be easily corrected even during operation. The scanners 8a and 8b use a light emitting diode pulse modulation method to detect positional deviation of the web, and are turned on and off at a constant frequency of several KHz, and only the signal near that frequency from the light receiving element is extracted by a filter. The inputs from both light receiving elements are differentially amplified. Therefore, it has excellent resistance to external light and electrical noise, and can detect the displacement of the wear with high precision.Since it uses a differential amplification method, it can always detect the displacement of the center of the web. be. This web position detection signal is then sent to the idle roll unit 6 and used to correct the meandering of the web.

Now, the No. J. IDOL CONIT 6 is configured as follows. Two rotatable parallel guide rolls 1a, 1
b and the swinging beam 20 are connected to the movable end plate 21a at both ends thereof.
, 21b to form a guide roll stand. A pivot shaft 22 is protruded from the center of the swing beam 20, and the pivot shaft 22 is connected to the bearing portion 2 at the center of the support beam 23.
4, the guide roll stand can swing freely. Therefore, two parallel guide rolls l
a.

1b is supported so as to be swingable within a plane formed by their central axes.

Note that both ends of the support bishim 23 have side walls.

Needless to say, it is fixed to frame 7.

Further, in the present invention, the fixed end plates 25a and 25b are fixed to the vicinity of both ends of the support beam 23, and the fixed end plates 2
Four presser bearings 26 are attached to each of 5a and 25b, and the moving end plates 21a and 21b are clamped by the two opposing presser bearings at both ends of the plates. These presser bearings 26 are attached by a mounting screw member 27 having an eccentric cam structure, and can be freely adjusted to a minute position wA15 by rotating and threading the mounting screw member 21. .Thus, the two parallel guide rolls 1a1ib
is supported so that it can swing freely only within a predetermined swinging plane, and swings in other directions, for example, in a direction perpendicular to the swinging direction, are completely prevented. Movable end plates 21a at both ends,
21b k: Since the cage C is slidably held, it can be held swingably only within a completely constant swinging plane, regardless of the length of the guide meal or the tension of the web.

In addition, instead of using the presser bearing 26 to make the movable end plate movable by its transfer, the movable end plate may be held by the presser piece so that it can slide freely. If this configuration is used for a long period of time, it is expected that play will occur due to wear due to sliding, so a configuration like this embodiment is preferable.

Further, it is preferable that the center of swing of the guide roll stand is located not at the center between the two parallel guide rolls, but at a position closer to the guide roll into which the web enters.

The most preferable position is to match the center of the incoming guide roll, but due to equipment design considerations! 1
Since there are m points, in this embodiment, the center of oscillation is set at an order of 2:1. This is advantageous in that when the kite roll stand swings, the change in the position of the incoming web can be kept small, and the web is less likely to wrinkle. In this way, it is possible to achieve stable and highly accurate rocking by setting the rocking center at an asymmetrical position. The structure of keeping the temperature constant is a major contribution.

Two limit switches 28a and 28b are arranged in parallel on one fixed end plate 25a, and a switch operating piece 30 that projects from the movable end plate 21a through the opening 29 controls the movement of the limit switches 28a and 28b. It is now possible to press Ha. In other words, these determine the swing range of the guide roll stand, so in this embodiment, when the guide roll stand swings ±5 degrees from the center position, the limit switch 28a
, 2811 is activated and a detection signal is sent to the outside.Therefore, this signal can be used to prevent the kite stand from moving any further. can.

In this embodiment, the guide roll stand is driven by a drive device 31 having a DC susceptor motor. If there is a difference between the control direction from the scatter mechanism 5 and the set position signal, a proportional operation 1a is sent to the DC ribo motor to change the swing angle of the guide roll stand so as to make the bias zero. control. Of course, this drive device may use a hydraulic motor instead of a DC servo motor, but an electric drive device is preferable because it simplifies the device.

In addition, if the two fixed rolls are arranged in a box shape (a shape in which the central axis is substantially convex when viewed from the side and constitutes a square shape) as in this example, the sea urchin 1 guide device and the previous stage or the next stage There is also the advantage that trouble will not occur even if the distance between the line and the roll is reduced, and the line can be shortened.

With the above configuration, the present invention allows the guide roll to be swung only within a fixed oscillation plane using a small and simple oscillation ring and bridge, regardless of the length of the guide roll or the magnitude of the web tension. It is extremely effective in that it can be held freely, completely prevent vibration in other directions, and realize highly accurate and stable rocking support of the guide roll.

[Brief explanation of the drawing]

1A and L-3 are diagrams explaining the principle of the guide roll mechanism, FIG. 2 is a perspective view showing an embodiment of the present invention, FIG. 3 is a plan view thereof, and FIG. 4 is a front view thereof. ia, 'lb...Guide 1]-le, 2...Web,
3.4...Fixed roll, 5...Scanner mechanism, 6.
・・Guide roll units I・, 20・・Swinging beam,
21a, 21b...Movable end plate, 22...Pivot,
23... Support beam, 24... Bearing part, 25a,
25b Fixed end plate, 26... Presser bearing. Special Engineering 1 Applicant Nikka Co., Ltd. Agent Omata Line Separation
Tanema Shigemi
Yunosuke Araki

Claims (1)

[Claims] 1. Two parallel guide rolls rotatably supported at both ends are swingably supported within a plane formed by their central axes, and the web running position is determined by changing the swing angle. In the web guide device, both ends of the two parallel guide rolls are attached to movable end plates fixed to both ends of a swinging beam, and the swinging beam is attached to a support beam at its center. The movable end plate is mounted so as to be swingable, and both ends of the movable end plate are held by a plurality of holding members fixed to the frame so as to be movable only within the swing plane, thereby allowing the guide roll to move within the swing plane. A web guide device characterized in that the web guide device is configured to prevent movement in directions other than J.