JP2002003032A - Web feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web feeding device providing high accuracy in feeding distance of a web. SOLUTION: This web feeding device comprises a length pattern printing means for printing on the web an optically readable length pattern, and a feeding distance measuring means for optically reading the length pattern printed on the web and measuring a feeding distance.

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 a feeding device capable of obtaining high accuracy in a feeding distance in feeding to a device that processes the web while stopping the web.

[0002]

2. Description of the Related Art In a conventional web feeding apparatus, as a method of measuring a web feeding distance, there is a method of measuring the number of rotations of a length measuring roller which comes into contact with the web, following the web feeding. Are 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 feeding apparatus that determines (controls) the web feeding distance from the rotation speed 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 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 web feeding device according to claim 1 of the present invention includes a length measurement pattern printing unit that prints an optically readable length measurement pattern on a web, and an optical length measurement pattern printed on the web. And a feeding distance measuring means for measuring the feeding distance.

According to the present invention, a length measurement pattern that can be optically read is printed on the web by the length measurement pattern printing means, and the length measurement pattern printed on the web is optically read by the feeding distance measurement means. The feeding distance is measured. That is, the measurement is performed in a non-contact manner, and there is no influence of the contact state which greatly affects the measurement accuracy. Therefore, there is provided a web feeding device capable of obtaining high accuracy in a web feeding distance.

According to a second aspect of the present invention, there is provided the web feeding apparatus according to the first aspect, wherein the length measuring pattern printing means feeds the web at a constant speed. And the feeding distance measuring means is provided in a high-speed intermittent feeding unit that combines the stop of web feeding and the high-speed feeding.

According to the present invention, since the length measurement pattern printing means is provided in the constant speed feeding section for feeding the web at a constant speed, the length measurement pattern has high printing accuracy. In addition, since the feeding distance measuring means is provided in the high-speed intermittent feeding unit that combines the stop of web feeding and the high-speed feeding, high accuracy can be obtained in the feeding distance of the web in the high-speed intermittent feeding.

According to a third aspect of the present invention, in the web feeder according to the first or second aspect, the length measurement pattern is printed on a blank portion of the web which does not remain on the product. It was done. According to the present invention, the printed mark does not remain on the product.

[0010]

Next, an embodiment of the present invention will be described. FIG. 1 shows an example of the configuration of the web feeding device of the present invention. In FIG. 1, 1 is a length measurement pattern printing unit, 2 is a feeding distance measuring unit, 10 is an unwinding unit, 20 is a buffer before stop, 30 is a stop processing unit, 40 is a buffer after stop, 50 is a winding unit, 100 is a web. As shown in FIG. 1, a wound body (roll) of the web 100 (before processing) is unwound in an unwinding unit 10 and a buffer 20 before stopping,
After the stop processing section 30 and the post-stop buffer 40, the winding section 5
At 0, again forming a wound body of the web 100 (after processing).

In the unwinding section 10 and the winding section 50, the web 100 continuously moves (conveys at a constant speed). on the other hand,
The stop processing unit 30 is a part that performs processing on the stopped web 100. That is, the stop processing unit 30
In, the web 100 performs an intermittent movement in which the feeding stop and the high-speed feeding are combined (high-speed intermittent feeding). The pre-stop buffer 20 and the post-stop buffer 40
By temporarily storing the web 10 in the meantime.
Ensure consistency for the delivery of zeros. That is, the average feeding speed in the constant-speed feeding and the high-speed intermittent feeding is made the same, and the web 100 is prevented from being slackened or stretched.

The length measuring pattern printing means 1 includes a web 100
A length measurement pattern that can be read optically is printed. FIG. 2 is an explanatory diagram of a state where the length measurement pattern is printed on the web. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals. That is, 1 is a length measurement pattern printing means,
3 is a length measurement pattern, 100 is a web, and 101 is a roll. 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. Further, as a printing method in the length measurement pattern printing means 1, flexographic printing, offset printing, gravure printing, inkjet printing, laser marking printing, or the like can be applied.

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 length measurement pattern 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.

In the example shown in FIG. 2, the length measuring pattern printing means 1 prints on the web 100 immediately after being unwound from the winding body 101. That is, the unwinding part 10
Is performed on the web 100 fed at a constant speed. The length measurement pattern 3 printed on the web 100 is a black and white pattern in which black lines having a predetermined width and white lines having a predetermined width are alternately arranged at predetermined intervals. here,
Black lines and white lines are not black and white lines in a narrow sense, but lines that have different optical characteristics in a broad sense such as shading, hue, reflection, scattering, interference, polarization, etc. I have.

The feeding distance measuring means 2 optically reads the length measurement pattern 3 printed on the web 100 to measure the feeding distance. FIG. 3 is an explanatory diagram of a state in which the length measurement pattern printed on the web is read. 3, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals. That is, 2 is a feeding distance measuring means, 3 is a length measurement pattern, 4 is a detection signal waveform,
100 is a web.

The feeding distance measuring means 2 has a detecting section for optically detecting a length measurement pattern and outputting a detection signal, and a calculating section for calculating a feeding distance based on the detection signal.
The detection unit outputs different voltage values, current values, and the like depending on which of the lines having different optical characteristics in the black-and-white pattern is detected. When the length measurement pattern 3 is the black-and-white pattern and the web 100 is being fed, the detection unit outputs a detection signal waveform 4 of a rectangular wave as shown in FIG. 3 as a detection signal. The arithmetic unit counts the number of waves in the detection signal. And
The feed distance is calculated by multiplying the counted wave number by the wavelength (a pair of black and white) in the length measurement pattern 3 printed on the web 100.

Next, the operation of the above-described configuration of the web feeding apparatus will be described. First, in the unwinding unit 10,
The web 100 is unwound from the winding body 101 at a constant speed. This speed is a speed controlled so that the average feeding speed in the constant-speed feeding and the high-speed intermittent feeding becomes the same as described above. The length measurement pattern printing means 1 prints the length measurement pattern 3 on the web 100 immediately after being unwound.

Web 100 on which length measurement pattern 3 is printed
Is further fed and reaches the pre-stop buffer 20. The web 100 is fed at a constant speed at the inlet of the pre-stop buffer 20, but is fed at a high speed at the outlet. That is, the web 100 is temporarily stored in the pre-stop buffer 20. The pre-stop buffer 20 has, for example, a predetermined number of movable rollers and a fixed number of rollers. Then, the position of the movable roller changes, so that the
Is configured so that the path length of the web 100 at the time changes. The movable roller changes its position so that the tension of the web 100 becomes a predetermined value. Therefore, the web 100 is temporarily stored without any slack or tension.

The above-described control for making the average feeding speed the same in the constant-speed feeding and the high-speed intermittent feeding is performed such that the temporary storage amount of the web 100 in the pre-stop buffer 20 is within a predetermined range. . The temporary storage amount can be detected by the position of the movable roller. If the temporary storage amount exceeds a predetermined range, the speed setting in the constant speed feeding is reduced. Alternatively, the setting of the high-speed feeding speed in the high-speed intermittent feeding is increased, or the setting of the stop processing time in the high-speed intermittent feeding is shortened. Conversely, when the temporary storage amount does not reach the predetermined range, the speed setting in the constant speed feeding is increased. Alternatively, the setting of the high-speed feeding speed in the high-speed intermittent feeding is reduced, or the setting of the stop processing time in the high-speed intermittent feeding is lengthened.

At the entrance of the stop processing unit 30, a web 100
There is a pair of feed rollers composed of a press roller and a drive roller that sandwich the sheet. The feed roller performs either an operation of stopping or feeding the web 100 at a high speed. The feeding distance measuring unit 2 optically reads the length measurement pattern printed on the web 100 immediately after being fed from the feeding roller, and measures the feeding distance.

When the processing in the stop processing unit 30 is completed, the feed roller feeds the web 100 at a high speed by a command from a control unit (not shown). When the feeding distance measured by the feeding distance measuring means 2 reaches a predetermined feeding distance, the feeding roller stops the web 100 by a command from the control unit. Then, the processing in the stop processing unit 30 is started by a command from the control unit. This operation is repeated, and the web 100
Is continuously performed.

The web 100 fed at a high speed reaches the buffer 40 after stopping. Web 100 stops after buffer 4
High-speed feeding is performed at the entrance of 0, but constant-speed feeding is performed at the exit. The operation of the web 100 at the entrance and the exit of the post-stop buffer 40 is as described in the pre-stop buffer 2 described above.
It is opposite (symmetric) to 0. Except for this point, the same buffer as the pre-stop buffer 20 can be applied to the post-stop buffer 40. Therefore, description of the operation is omitted.

After the stop, the web 100 is further fed from the buffer 40 and reaches the winding section 50. In the winding section 50, the web 100 is wound at a constant speed to form a wound body. Here, since it is wound up at a constant speed,
A good wound body can be obtained as a rolled shape.

[0024]

As described above, the web feeder according to the first aspect of the present invention provides a web feeder capable of obtaining high accuracy in the web feed distance. Further, according to the web feeding apparatus according to the second aspect of the present invention, the length measurement pattern has high printing accuracy, and high accuracy is obtained in the web feeding distance in high-speed intermittent feeding. Further, according to the web supply device of the third aspect of the present invention, the printed mark does not remain on the product.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a configuration of a web feeding device according to the present invention.

FIG. 2 is an explanatory diagram showing a state in which a length measurement pattern is printed on a web.

FIG. 3 is an explanatory diagram showing a state in which a length measurement pattern printed on a web is read. REFERENCE SIGNS LIST 1 measurement pattern printing means 2 feeding distance measurement means 3 measurement pattern 4 detection signal waveform 10 unwinding section 20 pre-stop buffer 30 stop processing section 40 post-stop buffer 50 take-up section 100 web 101 take-up body

Claims (3)

[Claims] 1. A length measuring pattern printing means for printing an optically readable length measuring pattern on a web, and a feeding distance for optically reading a length measuring pattern printed on the web to measure a feeding distance. A web feeding device comprising a measuring means. 2. The web feeding device according to claim 1, wherein
The length measurement pattern printing unit is provided in a constant speed feeding unit that feeds the web at a constant speed, and the feeding distance measuring unit is a high-speed intermittent feeding that combines a stop of web feeding and a high speed feeding. A web feeding device provided in a section. 3. The web feeding device according to claim 1, wherein the length measurement pattern is printed on a blank portion of the web that does not remain on the product.