SU1388373A1 - Apparatus for monitoring the position of edges of moving web - Google Patents

Abstract

This invention relates to systems for controlling lateral displacement of a lengthy material. The purpose of the invention is to improve the accuracy of control. When the edges of the web 3 are mixed, the slit-like arcuate hole 5 of the plate 4 partially overlaps. At the moment when 8 discs pass through the hole 5, the time of illumination of the photoreceiver 2 by the light beam decreases, respectively, by the overlap of the hole 5. The trigger 9 gives a signal corresponding to the duration of the light flux. The light flux enters the photodetector 2 only when the hole 8 coincides with the hole 5. When the photodetector 2 is illuminated, trigger 9 opens and transfers the reference frequency from the generator 10 of the reference frequency to the adder I. In the adder 11, the pulses are added and subtracted from both triggers 9. Number in the adder 11 and characterizes the position of the edges of the canvas. 3 il. i (Л С 00 00 СХ) со со I I

Description

This invention relates to lateral displacement control systems for moving long material.

The purpose of the invention is to improve the accuracy of control.

FIG. 1 shows a block diagram of the device; in fig. 2 - device, general view; in fig. 3 is a view A of FIG. 2

The device contains optocoupler sensors for positioning the edges of the web with radiation sources 1 and photodetectors 2. The web 3 passes under the radiation source 1. The axis of the radiation sources and photodetectors is located along the edges of the web 3.

The sensors are provided with plates 4 installed under the blade 3 with sipe-shaped arched holes 5. Holes 5 are located coaxially with radiation sources 1 and photodetectors 2. There are disks 6 which are kinematically connected to each other and equipped with a drive 7. Disks 6 are installed under (or above) the plates 4 and provided with holes 8. The holes 8 are circumferentially formed, and the disks 8 themselves are mounted so that these holes 8 are located coaxially with the slit-like holes 5 of the plates 4.

The device has an information processing unit. It contains triggers 9 associated with photoreceivers 2, a reference frequency generator 10 associated with triggers 9, an adder II connected to both triggers 9, a setting device 12 of nominal web width associated with an adder 11. The device also contains an actuator 13 and an indicator 14 associated with the outputs of the adder 11.

The device works as follows.

When the edge of the web 3 is displaced, the slit-like holes 5 of the plates 4 partially overlap. At the moment when the holes 8 of the disk 6 pass through the slots 5, the time of illumination of the photoreceiver 2 by the light beam decreases according to the overlap of the slots 5. The trigger 9 outputs a signal corresponding to the duration light flux. The light flux enters the photodetector 2 only when the hole 8 coincides with the slit 5. At the time of illumination of the photodetector 2 trigger 9 from 0

five

It closes and transmits the reference frequency from the generator 10 to the adder 11. In the adder 11, the pulses are added and subtracted from the outputs of the flip-flops 9 and compared with the specified width of the web in the setting unit 12.

When the edge is shifted without increasing the width of the web, the adder 11 receives unequal number of pulses from the flip-flops 9. Their difference is an indication of the amount of web displacement.

As the width of the web increases, the sum of the pulses from both triggers 9 exceeds the one set by the setpoint by the amount of web widening.

The signal from the adder 11 is transmitted to the actuator 18 and the indicator 14.

Claims (1)

Invention Formula A device for monitoring the position of the edges of a moving web, comprising opto-sensors of the position of the edges of the web, each of which has a radiation source and a photodetector with coincident optical axes perpendicular to the plane of movement of the web, and mounted between the radiation source and the photoreceiver rotatably in the plane, perpendicular optical axis of the radiation source and photodetector, a disk with apertures made along its periphery, and according to the number of optocouplers 0 position of the edges of the trigger, the outputs of which are connected to the information inputs of the adder, the installation input connected to the output of the unit of the nominal width of the canvas, and the output associated with the input of the indicator, 5 that, in order to improve the control accuracy, it is equipped with a generator of the reference frequency, and each optocoupler of the blade edge position has a plate with a slit-like arched hole, with the plate mounted above or below the disk and  parallel to it, and a slot-like arcuate hole is located along the path of the disk holes, with the output of the reference frequency generator connected to the first inputs of the trigger, the second inputs of which are connected to the outputs of the corresponding photodetectors. Compiled by B. Kissin Editor M. Nedoluzhenko Tehred I. VeresKorrektor A. Tsko Order 1520/25 Circulation 585 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4 Fig.z