JPS61145407A - Between-marks distance meter - Google Patents

Abstract

PURPOSE:To enable control of elongation and contraction of a web during drying and processing operations of a web, by indicating and recording difference of between mark distances prior to and subsequent to drying and processing operations. CONSTITUTION:A web subjected to equi-distance marking by a printer 1 is elongated and contracted in a processing station 2. A rotary encoder 3 contacts with the running web to be rotated and generators length-measuring pulses. A counter 6, every time when mark pulses are introduced from a detector 4, transfers the contents to a memory 8 and immediately after, the value equivalent to the reference length is set by a setting apparatus 7 and, every time when the length-measuring pulses are introduced, subtracting calculating is performed. Namely, the counter value transferred to the memory 8 represents the reference length less the distance between the marks, and if the value is equal to zero, the reference length is equal to the distance between marks and it is judged that no difference due to elongation and contraction did take place. Further, if the value is with a negative sign, the reference length < mark distance and if positive, the reference length > mark distance. Further, the value of the memory 8 is capable of reading a deviated value relative to the reference length directly by a digital display apparatus 9. Further, supply is available to a recording 11 also through a D/A converter 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a measuring device for measuring the length of sheet materials such as paper, cloth, tape, etc.

Conventional technology In a paper machine or a paper processing machine, register marks (hereinafter referred to as marks) are printed on a web of paper etc. in advance at equal intervals, and the expansion and contraction caused by drying or processing the marks is removed by drying or processing. By measuring the distance between the marks after processing, comparing it with the mark distance during printing (hereinafter referred to as the standard length), and recording it, you can understand the degree of expansion and contraction and variations, and this makes it possible to control the drying and processing processes. Become.

Traditionally, process control in the drying and processing department has been based on physical property values such as temperature, humidity, and pressure, as well as web basis weight, moisture content, paper thickness,
This was previously done by measuring tension, etc., but web expansion and contraction control is important for paper that requires patterns, etc. to be placed on the web, then dried and processed, and then cut in a fixed position. It is.

The mark printed on the web at -ff is printed on the printing surface and at the margin of the edge of the web, and is used for registration when cutting into sheets. However, in paper machines or processing machines, when printing marks for the purpose of process control or quality control during drying and processing, and measuring the interval, it is necessary to measure not only the absolute value of the mark interval but also the variation with respect to the standard length. Understanding is important, and a measuring instrument that can easily read the degree of variation and its tendency has been desired.

Conventionally, measurement methods for this purpose include a device that generates pulses based on the movement of the web (for example, a rotary encoder with a measuring wheel attached to it, which rotates in contact with the running web to generate pulses), and a marking device. It was a device that simply measured the distance between marks using a measuring device consisting of a device for detecting marks and a counter.

Problems to be Solved by the Invention Therefore, if the standard length is set to 5001 and the mark spacing is measured, the difference in expansion/contraction of the mark spacing with respect to the standard length is approximately 1 inch. In this case, the absolute value of the mark interval can be known, but the difference in expansion and contraction, that is, the deviation from the reference length, cannot be intuitively understood.

The present invention provides a measuring instrument that displays and records the difference between the reference length, that is, the mark interval before drying and processing, and the mark interval after drying and processing, and obtains data that allows the state of the process to be easily grasped. The purpose is to

Means for Solving the Problems The present invention will be explained with reference to the accompanying drawings. FIG. 1 is a schematic diagram of the mounting position of a paper machine or processing machine and a detector of a measuring device. A printing device 1 prints marks at regular intervals on a wet or unprocessed web.

The web undergoes expansion and contraction in the drying or processing section 2 of the machine. The rotary encoder 3 rides on a guide roll, rotates in contact with the running web, and generates a length measurement pulse of 0.1 wm/pulse. The rechargeable detector 4 generates one mark pulse each time it detects a mark. The counting/display/recording device 5 displays and records measurement results.

The action counting/displaying/recording device 5 is composed of each device shown in FIG. The counter 6 is a preset counter, in which a value corresponding to the reference length is set using a setter 7, and the value is loaded into the counter using a mark pulse. Therefore, the counter 6 is set to a value corresponding to the reference length when the mark detector captures the mark. Note that the counter 6 functions as a subtracter, and is subtracted by one count each time a length measurement pulse from the rotary encoder is input, that is, each time the actual web moves by 0.1 . Furthermore, when the mark detector detects the next mark, the value of the counter is first transferred to the memory 8 at the leading edge of the mark pulse. Then, the operation of immediately loading the set value into the counter can be repeated. therefore,
The counter value transferred to memory is the value obtained by subtracting the interval between marks printed on the web under the mark detector from the reference length. If the value is 0, the reference length and mark interval are equal and there is no difference in expansion or contraction. be judged. Also, if it is negative, the reference length is longer than the mark interval, and if it is positive, the reference length is greater than the mark interval.

To explain this all together with reference to FIG. 3, the counter 6 stores the contents in the memory 8 every time a mark pulse is input.
Immediately after, a value corresponding to the reference length is set, and 1 is subtracted every time a length measurement pulse is input.

Then, when the next mark is entered, its value, that is, the deviation value from the reference length, is transferred to the memory, and this operation is repeated one after another.

Further, the value in the memory 8 can be used to directly read the deviation value from the reference length on the digital display device 9, and the digital-to-analog converter 10+i generates a DC voltage corresponding to the displayed value and writes it with a pen. Recorder 1
Supply to 1.

Effects of the Invention As is clear from the above explanation, the display and records obtained by the measuring device according to the present invention are useful for controlling the expansion and contraction of the web during drying and processing in paper machines, processing machines, etc. The comprehensive result of each factor that causes fluctuations, such as temperature, humidity, and working conditions, can be grasped intuitively, and is very useful in actual machines.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the machine and the mounting positions of each detector, FIG. 2 is a block diagram of the counting/display/recording device, and FIG. 3 is an explanatory diagram of the operation of the counting/display device. DESCRIPTION OF SYMBOLS 1...Printing device, 2...Processing section, 3...Rotary encoder 14...Mark detector, 5...Counting/display-recording device, 6...Preset counter, 7
... Setting device, 8 ... Memo IJ-19 ... Digital display device, 10 ... Digital-to-analog converter, 11
...A recorder with a pen. Fig. 1 Fig. 2 Standard length> Interval Standard length = Interval Standard long interval Fig. 3

Claims (1)

[Claims] A mark interval length measuring device is characterized in that it measures the interval between register marks placed at approximately equal intervals on a moving sheet-like material, and displays and records the deviation from a preset value.