JPH0133319B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and apparatus for cutting a web, and particularly for cutting a thin strip material (hereinafter referred to as a web) such as paper, plastic film, cloth, or metal in a longitudinal direction. The present invention relates to a method and apparatus for cutting a web into multiple strips in a direction.

[Prior art]

FIG. 1 is a plan view showing an example of a conventional web cutting device, and FIG. 2 is a front view thereof (Japanese Unexamined Patent Publication No. 160098/1983). Cut the web 10 into multiple strips of required width and cut the side edges (edges).
A slitter 12 for removing 14 is fixedly installed,
A cutter 16 for cutting the web 10 cut into a plurality of strips into a predetermined length is fixedly installed at the subsequent stage.

In the above configuration, the web 10 is continuously supplied to the slitter 12 via a transport roll (not shown). Widths W1 and W2 by slitter 12
At the same time, the side edges 1 on both sides of the web 10 are cut to ensure dimensional accuracy after slitting.
4 (widths l and l') are cut and removed. Further, the web cut into two strips is cut into a desired length by a cutter 16 and processed into sheets 18 one by one.

Conventionally, the web edge position is generally controlled by edge position control (EPC), where the average value of the web width is Wo, the variation amount of the web width is wo, and the meandering of the web edge. If the amount is Ee, the width dimensions W1 and W2 after slitting are as follows: W1, W2=Wo/2±wo±Ee - (1).

However, with conventional web cutting equipment, it is necessary to perform side trimming in order to reduce variations in width dimensions W1 and W2 after slitting, resulting in waste of raw material and the inconvenience of complicating equipment. There is.

In particular, recently, in the case of photographic film, etc., it has become possible to uniformly apply photosensitive material to the edges, and the need for side trimming has diminished, and control technology that replaces web edge position control has become possible. It is hoped that this will be established.

[Purpose of the invention]

An object of the present invention is to provide a web cutting method and apparatus that eliminates the need for side trimming.

[Structure of the invention]

The present invention adopts a center position control (CPC) that controls the center position of the web, so that the width dimensions W1 and W2 after slitting can be adjusted to W1, W2=Wo/2±wo/2±Ec - (2) (However, Ec is the meandering amount at the center of the web.) Since it can be assumed that Ec=Ee≒0, especially by controlling the web center position,
The width dimensions W1 and W2 after slitting are as follows: W1, W2=Wo/2±wo/2 - (3). As is clear from equation (3), the variation in the width dimension after slitting can be reduced to 1/2 compared to equation (1), reducing the variation in dimension caused by variation in the width of the original fabric. can be done.

Specifically, in order to control the web center position, deviations in the width direction are detected by monitoring both sides of the web with two line scanning cameras (or photodiode array sensors), etc. The web just in front of the slitter is corrected and moved to an appropriate position so that the web position is always constant relative to the slitter blade.

〔Example〕

FIG. 3 is a perspective view showing a preferred embodiment for applying the method of the present invention. (The figure shows an example of cutting into two strips.) A slitter 20 that does not have a blade for side trimming but has a slitter blade 22 for cutting.
and a cutter 24 are installed at a predetermined distance. Conveying rollers 26 and 28 are provided at the front and rear parts of the slitter 20, and the conveying roller 26
Line scanning cameras 30a, 30 are mounted on the top of the
b is arranged so as to be horizontally movable in proportion to the width of the web 10. The line scanning cameras 30a and 30b are screwed into the screw member 32, and the screw member 3
Depending on the direction of rotation of the two cameras, the two cameras are brought closer or separated. The screw member 32 is connected to a drive member 34 that includes a motor and a speed reduction mechanism. Also,
Above the conveyance roller 26, the web 10 is suspended approximately vertically, and a line scanning camera 30 is mounted.
A web position guide roll 36 that twists the web 10 and moves it left and right (in the longitudinal direction) on the conveying roller 26 according to the position detection information of a and 30b.
a and 36b are provided. In the web position guide rolls 36a and 36b, one end of a connecting member 44 is rotatably supported by a shaft 38, and an operating member 42 of an actuator 40 is provided at the other end.

Also, the configuration of the electric circuit is as shown in Figure 4,
The line scanning cameras 30a, 30b are controlled by a camera controller 46 and supplied with timing signals, etc., and edge detection information is sent to a computing unit 48. In the computing unit 48, the web 10
The amount of deviation x between the center of the camera and the center between the cameras is calculated.
A D/A converter 50 is connected to the arithmetic unit 48 and converts the digital output signal output from the arithmetic unit 48 into an analog signal. Further, an amplifier 52 is connected to the D/A converter 50 to amplify power and drive the actuator 40 according to the amount of deviation of the web 10.

In the above configuration, the web 10 is fed to the slitter 20 via the web position conveyance rollers 36a, 36b and the guide roller 26, and is cut into two strips, and then transferred to the cutter 24 by the conveyance roller 28. It is supplied and cut in the width direction. Line scanning cameras 30a, 30 are positioned in advance according to the width of the web 10.
As shown in FIG. 5, the field of view b is the edge portion of the web 10, and the reading distance C by the camera 30a is
1 and the reading distance C2 by the camera 30b are as follows: C1=B1/Total number of bits of the camera x V1 - (4) C2=B2/Total number of bits of the camera x V2 - (5) (However, B1 and B2 are the distance of the camera 30a and 30b
, and V1 and V2 are the fields of view of the cameras 30a and 30b). Also, the distances P1 and P from the center between the cameras to the edge of the web
2 is P1=C1+D/2-V1/2, P2=C2+D/2-V2/2 - (6) (where D is the distance between the centers of view of cameras 30a and 30b), and the center of the web The amount of deviation x from the center between cameras is expressed as x = (P2 - P1) / 2 = (C2 - C1) / 2 - (V2 - V1) / 4 - (7). This amount of deviation x is the amount that needs to be corrected by the actuator 40, and is calculated by the calculator 48. Arithmetic unit 48
The correction request amount output from the D/A converter 50 is converted into an analog signal, and based on this analog signal, the amplifier 52 performs power amplification as shown in FIG. The actuator 40 configured as shown in FIG. As a result, the web position guide rollers 36a and 36b rotate by θ so that the amount of deviation x becomes zero, twisting the web 10 suspended by these rollers, and depending on the amount of twisting, the web position guide rollers 36a and 36b rotate by θ, and the web 10 that comes into contact with the conveying roller 26 corresponds to the amount of twisting. 10 to the right or left by the amount of modification requested.

Although an example is shown in which a digital type is used as the arithmetic unit 46, an analog type can also be used. In this case, the D/A converter 50 can be omitted. Further, the amplifier 52 may be configured to include a PID controller.

Further, the arithmetic processing by the arithmetic unit 48 can be performed using a microcomputer. That is, in FIG. 7, the line scanning camera 30a
and registers 62 and 6 which store the output signals of 30b and output them to the bus line 66 when a read request is made.
4. A ROM 68 that stores a program for executing arithmetic processing, a CPU 70 that executes processing according to the program in the ROM 68, a RAM 72 that temporarily stores data and processing results, and a predetermined amount of correction requests that are the arithmetic results. The microcomputer 60 can be constituted by the output interface 74 that outputs the output to the D/A converter 50 at a timing, and its processing is performed as shown in FIG. 8, for example.

FIG. 8 is a flowchart showing an example of processing by the microcomputer 60. First, operate the keyboard (not shown) to write data based on specifications such as the distance D between the cameras, the total number of bits of each of the cameras 30a and 30b, the number of shading bits B, and the field of view V of each camera to the RAM 72 and press the RUN button (system operation command). As a result, the microcomputer 60 starts moving, calculates the reading distances C1 and C2 of the cameras, then calculates the distances P1 and P2 from the center between the cameras to the edges of the web, and calculates the distances P1 and P2 from the center between the cameras to the edges of the web. The amount of deviation x is calculated based on this. This deviation amount x is sent as a correction request amount to the D/A converter 50 via the output interface 74, and unless a termination command (system operation stop command) is issued,
The arithmetic processing from Equation (4) to Equation (7) is repeatedly executed at fixed time intervals.

In addition, in the above embodiment, the web is modified by the amount x
Although the slitter blade 22 is moved according to the above description, the web may be fixed and the slitter blade 22 may be moved.

Further, as the web guide device, although an embodiment using an intermediate guide method has been introduced, it is also possible to use an unwinding guide method or a free loop guide method.

In the above embodiment, the explanation has been given to two web webs, but the present invention can also be applied to three or more web webs. Furthermore, the present invention can be applied to the case where the sheet is wound into multiple strips without cutting with the cutter 24 after cutting.

〔Effect of the invention〕

As is clear from the above, according to the present invention, since the side trimming process is not necessary, the configuration of the slitter can be simplified, and the number of slitter blades and raw material can be reduced.

[Brief explanation of drawings]

1 and 2 are a plan view and a front view showing an example of a conventional web cutting device, FIG. 3 is a perspective view showing an embodiment of the present invention, and FIG. 4 is an electric circuit of the embodiment of the present invention. FIG. 5 is an explanatory diagram of positional deviation detection, FIG. 6 is an amplification characteristic diagram of the amplifier shown in FIG. 4, FIG. 7 is a block diagram showing another embodiment of the electric circuit, and FIG. This figure is a flowchart showing an example of processing in the configuration of FIG. 7. 10...web, 20...slitter, 22...
... Slitter blade, 24 ... Cutter, 26 ... Conveyance roller, 28 ... Conveyance roller, 30a, 30b
... Line scanning camera, 32 ... Screw member, 34 ... Drive section, 36a, 36b ... Web position guide roll, 38 ... Axis point, 40 ... Actuator, 42 ... Actuation member, 44 ... Connection Member, 46...Camera controller, 48...Arithmetic unit, 50...D/A converter, 52...Amplifier, 6
0...Microcomputer.

Claims (1)

[Claims] 1. Detecting the distances from both ears of a continuously running web to a predetermined position in the center, and controlling the relative positions of the web and the cutting blade so that the difference in distance becomes zero. A web cutting method characterized by: 2 First and second line scanning cameras whose field of view covers both ends of the continuously running web, and the center position of both cameras based on the output signals of the first and second line scanning cameras. computing means for calculating the distances P ₁ and P ₂ from to both ears of the web, and calculating from these the required correction amount x to which the running position of the web should be moved; and based on the requested correction amount x by the calculation means. A web cutting device comprising: a web position correction mechanism that corrects the running position of the web in front of the cutting position so that the requested correction amount x becomes zero.