JP2002003038A - Web intermittent feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web intermittent feeding device having high accuracy in web feeding distance. SOLUTION: This web intermittent feeding device comprises a mark printing means, a feeding distance measuring means, a mark position measuring means, and a feeding distance correcting means. The mark printing means prints an optically readable mark on the web stopped in feeding, and the feeding distance measuring means measures a feeding distance of the web, the mark position measuring means optically reads the mark printed on the web fed and stopped again based on the feeding distance and measures a mark position, and the feeding distance correcting means corrects the feeding distance of the web based on the mark position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of feeding a web to a processing device. In particular, the present invention relates to an intermittent feeding device that can obtain high accuracy in the feeding distance in intermittent feeding to a device that processes the web while stopping the web.

[0002]

2. Description of the Related Art In a conventional web intermittent feeding apparatus, as a method of measuring a web feeding distance, a method is used in which a length measuring roller in contact with the web is measured from the number of rotations that the web is rotated with the web feeding. It has been known. In this method, the contact state between the length measuring roller and the web greatly affects the measurement accuracy. Therefore, a material that increases the frictional force between the length measuring roller and the web is applied to the surface material of the length measuring roller. In addition, a bearing that reduces the rotational resistance of the length measuring roller or a light material that reduces the moment of inertia is used.

[0003]

However, although this reduces the slippage that occurs between the measuring roller and the web, it still exists. In addition, there are many measurement errors due to other factors such as adhesion of dust to the surface of the length measuring roller, temperature change, etc., and it is extremely difficult to always maintain the state of the length measuring roller properly in an actual use environment. It is. further,
There are changes and changes in the web surface condition and delivery mode. For this reason, in the conventional web intermittent feeding apparatus that determines (controls) the web feeding distance from the rotation number of the length measuring roller that rotates, high feeding accuracy cannot be obtained.

The present invention has been made to solve the above problems. An object of the present invention is to provide a web intermittent feeding device capable of obtaining high accuracy in a web feeding distance.

[0005]

The above problems are solved by the present invention described below. That is, the intermittent web feeding device according to claim 1 of the present invention is an intermittent web feeding device having a mark printing unit, a feeding distance measuring unit, a mark position measuring unit, and a feeding distance correcting unit. The mark printing means prints an optically readable mark on the web stopped feeding, the feeding distance measuring means measures the feeding distance of the web, and the mark position measuring means The mark printed on the web that has been fed and stopped again based on the feeding distance is optically read to measure a mark position, and the feeding distance correction unit feeds the web based on the mark position. The distance is corrected.

According to the present invention, an optically readable mark is printed on the web whose feeding has been stopped by the mark printing means, and the feeding distance of the web is measured by the feeding distance measuring means. The mark printed on the web fed by the position measuring means and stopped again based on the feeding distance is optically read and the mark position is measured,
The feeding distance of the web is corrected by the feeding distance correcting means based on the mark position. That is, the feeding distance is corrected based on the mark position measured without feeding and without contact,
The influence of the feeding state and the contact state, which greatly affects the measurement accuracy, is eliminated. Accordingly, there is provided a web intermittent feeding device capable of obtaining high accuracy in a web feeding distance.

According to a second aspect of the present invention, there is provided an intermittent web feeding apparatus according to the first aspect, wherein the mark is printed on a blank portion of the web not remaining on the product. According to the present invention, the printed mark does not remain on the product.

According to a third aspect of the present invention, there is provided a web intermittent feeding apparatus according to the first or second aspect, wherein the feeding distance measuring means includes a length measuring roller which comes into contact with the web, and wherein the length measuring roller contacts the web. The feeding distance of the web is measured from the number of rotations accompanied by the feeding. According to the present invention, a conventional contact type device is used as the feeding distance measuring means.

According to a fourth aspect of the present invention, there is provided a web intermittent feeding apparatus according to any one of the first to third aspects, wherein the mark position measuring means is configured to detect the mark in the web feeding path. The detection position is set so as to be changeable. According to the present invention, it is possible to change the length of the web feeding path from the installation position of the mark printing unit to the installation position of the mark detection unit. Therefore, the set value of the web feeding distance can be changed.

According to a fifth aspect of the present invention, there is provided a web intermittent feeding apparatus according to any one of the first to fourth aspects, wherein the mark printing means stops and processes the web. And the mark position measuring means is provided downstream of the stop processing unit. According to the present invention, the feeding distance corresponding to the entire length of the stop processing unit can be accurately set. In addition, restrictions on the installation location are small.

[0011]

Next, an embodiment of the present invention will be described. FIG. 1 shows an example of the configuration of the intermittent web feeding device of the present invention. In FIG. 1, 1 is a mark printing means, 2 is a mark position measuring means, 3 is a feeding distance measuring means,
4 is a feed roller, and 100 is a web. Web 100
Is fed in the direction of the arrow (→), and the feeding is an intermittent operation performed by a web intermittent feeding device. That is, the web 100 performs an operation of stopping between the feeding and the next feeding.

The mark printing means 1 prints an optically readable mark on the web 100 whose feeding has been stopped. The shape of the mark will be described later (see FIG. 2). As a printing method in the mark printing means 1, stamp printing, ink jet printing, laser marking printing, or the like can be applied. The web 100 is, for example, printing paper, plastic film, metal foil, metal sheet for shadow mask, metal sheet for precision etching, and the like.

The present invention is not limited by what the web 100 is like. Further, the present invention is not limited by the printing method in the mark printing unit 1. Since the appropriate printing method differs depending on what the web 100 is like, a combination suitable for each condition may be selected for each application.

The mark position measuring means 2 reads a mark printed on the web 100 whose feeding is stopped, and measures the mark position. As shown in FIG. 1, the position where the mark is printed on the web 100 by the mark printing unit 1 is separated from the position where the mark printed on the web 100 is read by the mark position measuring unit 2. The mark position measuring means 2 reads the mark printed on the web 100 which has been fed after printing and is stopped again.

That is, the position where the mark is printed and the position where the mark is read are separated by a distance corresponding to one feeding distance (or an integral multiple thereof) in the feeding path of the web 100. In other words, the set feeding distance in the intermittent feeding of the web 100 is determined by the arrangement of the mark printing unit 1 and the mark position measuring unit 2 in the feeding path of the web 100. As shown in FIG. 1, in this example, the mark printing means 1 and the mark position measuring means 2 are arranged apart from each other by a distance corresponding to the set feeding distance.

Therefore, the distance between the mark printing means 1 and the mark position measuring means 2 in the feeding path of the web 100 can be changed so that the feeding distance can be set arbitrarily. For example, it is preferable to install the mark position measuring means 2 so as to be able to change the detected position of the mark in the feeding path of the web 100.

Further, a stop processing section for performing processing on the stopped web 100 is provided between the mark printing means 1 and the mark position measuring means 2. That is, it is preferable that the mark printing unit 1 be provided upstream (or entrance) of the stop processing unit that stops and processes the web, and the mark position measurement unit be provided downstream (or exit) of the stop processing unit.

The mark position measuring means 2 has a detecting section and a calculating section. For the detecting section, for example, a CCD camera having a one-dimensional or two-dimensional image pickup area can be applied. FIG. 2 shows an example of an image including a mark obtained by imaging by a detection unit having a two-dimensional imaging region. In FIG. 2, a mark 10 is a mark in which a circle and a cross crossing at the center thereof are combined. It is a condition that the mark is a mark that can perform position measurement with high accuracy in combination with the mark position measuring means 2. In addition, easy printing is added as a condition. In the present invention, the shape of the mark is not particularly limited as long as those conditions are satisfied.

In the captured image shown in FIG. 2, a square outer frame and a line intersecting the center of the square equally and vertically and horizontally are inserted (combined) together with the mark 10. If this line and the cross of the mark 10 overlap, there is no feeding error, and if they are off, there will be a feeding error corresponding to the departed distance. In FIG. 2, the feeding error corresponding to the feeding direction of the web 100 is indicated by an arrow (← →).

The calculating section of the mark position measuring means 2 performs a calculation based on the captured image to derive a feeding error as shown in FIG. As the calculation unit, a data processing device such as a microcomputer can be applied. For example, the arithmetic unit binarizes the captured image and extracts a mark. In the binary image, the calculation unit calculates the barycentric coordinates of the mark and derives a feeding error.

The mark position measuring means 2 reads the mark from the stopped web 100. Therefore, the feeding distance of the web 100 from the start of feeding to the stop thereof is measured by another measuring means, and control for stopping is performed based on the measured value. The measuring means is the feeding distance measuring means 3 shown in FIG. As the feeding distance measuring means 3, a conventional one which is originally installed in the web feeding device and has low measurement accuracy can be applied. That is, the feeding distance measuring unit 3 measures the feeding distance of the web from the number of rotations of the length measuring roller that comes into contact with the web 100 as the web 100 is fed.

The feed roller 4 is a pair of rollers composed of a pressing roller and a driving roller for nipping the web 100.
The feed roller 4 performs either an operation of stopping or feeding the web 100.

Next, the operation of the above-described web intermittent feeding apparatus will be described. First, it is assumed that the web 100 has stopped feeding. The mark printing means 1 prints an optically readable mark on the web 100 which has stopped feeding. At this time,
It is preferable to print the mark in a blank portion of the web 100 that does not remain in the product.

When a predetermined condition is satisfied, the feed roller 4 starts feeding the web 100 under the command of a control unit (not shown) of the web intermittent feeding device. The web 100 is fed in the direction of the arrow (→) shown in FIG. The feeding distance measuring means 3 measures the feeding distance of the web 100. When the measured value of the feed distance matches the set feed distance, the feed roller 4 stops feeding the web 100 under the command of the control unit. The control unit determines whether the measured value of the feeding distance matches the set feeding distance.

The mark position measuring means 2 optically reads a mark printed on the web 100 which has been fed as described above and has been stopped again based on the measured feeding distance. That is, a captured image is obtained. At this time, although an error is included in the above-described measured feeding distance, an imaging region where a mark is always included in a captured image is normally set. The mark position measuring means 2 performs a calculation based on the captured image to measure the mark position. That is, a feed error for the set feed distance is derived.

Correction is performed based on the feed error so that the feed distance matches the set feed distance with high accuracy. The correction is performed by a feeding distance correcting unit (not shown).
As the feeding distance correction means, a data processing device such as a microcomputer can be applied. The correction of the feeding distance by the feeding distance correcting means is performed, for example, by calibrating the feeding distance measuring means 3 so that the feeding distance completely matches the set feeding distance.

As described above, the feeding distance measuring means 3 is configured such that the length measuring roller contacting the web 100 is
The feeding distance of the web is measured from the number of rotations accompanied by the feeding of 0. Therefore, the feed distance measuring means 3 can be calibrated by changing the coefficient for calculating the feed distance from the rotation speed to an appropriate value. If the measurement by the feeding distance measuring means 3 is stable and reproducible,
Thereby, high accuracy can be obtained in the feeding distance of the web. When the measurement is stable, the calibration of the feeding distance measuring means 3 by the feeding distance correcting means is performed when a condition such as a lapse of a predetermined time, a change of an item, a change of a feeding speed, or the like is changed. It only needs to be done.

Another example of the correction of the feeding distance by the feeding distance correcting means will be described. For example, the stop position of the web 100 is corrected so that the feeding distance completely matches the set feeding distance. That is, the feeding distance correcting means operates the feeding roller 4 via the control unit, and corrects the position of the web 100 so as to eliminate the feeding error. Even when the measurement by the feeding distance measuring means 3 is not stable and has no reproducibility,
Thereby, high accuracy can be obtained in the feeding distance of the web.

By combining both the method of correcting by the feeding distance correcting means and the above-mentioned method of calibrating, a suitable intermittent web feeding apparatus can be realized. That is, when the measurement by the feeding distance measuring means 3 is stable and has reproducibility, no correction is performed and no dead time is generated. If the measurement is not stable and has no reproducibility for some reason, the correction is performed.

[0030]

As described above, according to the intermittent web feeding apparatus according to the first aspect of the present invention, there is provided an intermittent web feeding apparatus capable of obtaining high accuracy in the web feeding distance. You. Further, according to the intermittent web feeding device according to the second aspect of the present invention, the printed mark does not remain on the product. Further, according to the intermittent web feeding device according to the third aspect of the present invention, a conventional contact device is used as the feeding distance measuring means. Further, according to the web intermittent feeding device according to claim 4 of the present invention, the set value of the web feeding distance can be changed. Further, according to the intermittent web feeding device according to claim 5 of the present invention, the feeding distance corresponding to the entire length of the stop processing unit can be set accurately. Also,
Installation location is small.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a configuration of a web intermittent feeding device of the present invention.

FIG. 2 is a diagram illustrating an example of an image including a mark obtained by imaging by a detection unit having a two-dimensional imaging region. DESCRIPTION OF SYMBOLS 1 Mark printing means 2 Mark position measuring means 3 Feeding distance measuring means 4 Feeding roller 10 Mark 100 Web

Claims (5)

[Claims] 1. A mark printing means, a feeding distance measuring means,
An intermittent web feeding device having a mark position measuring unit and a feeding distance correcting unit, wherein the mark printing unit prints an optically readable mark on a web whose feeding is stopped, The feeding distance measuring means measures a feeding distance of the web, and the mark position measuring means optically reads a mark printed on the web which has been fed and stopped again based on the feeding distance, and a mark position. The intermittent feeding device of the web, wherein the feeding distance correcting means corrects the feeding distance of the web based on the mark position. 2. The intermittent web feeding device according to claim 1, wherein the mark is printed on a blank portion of the web that does not remain on the product. 3. The web intermittent feeding device according to claim 1, wherein the feeding distance measuring means is configured to determine the web rotation speed based on the number of rotations of a length measuring roller that comes into contact with the web accompanying the web feeding. A web intermittent feeding device characterized by measuring a feeding distance. 4. A web intermittent feeding apparatus according to claim 1, wherein said mark position measuring means is provided so as to be able to change a detection position of said mark in a web feeding path. Web intermittent feeding device. 5. A high precision feeding apparatus according to claim 1, wherein said mark printing means is provided upstream of a stop processing section for stopping and processing said web, and said mark position measuring means. A web intermittent feeding device provided downstream of the stop processing unit.