SU1666917A1 - Device for measuring the width of moving materials - Google Patents

Abstract

The invention relates to devices for measuring the width of roll materials and can be used on measuring tables for textile machines. The aim of the invention is to improve the measurement accuracy. A characteristic feature of the device is the use of probes made in the form of plates of different lengths for determining the location of the edges of the material, each of which has a code in the form of holes, the holes lying on the optical axes of the opto-matrix, connected through an information processing unit to the display unit. 2 Il.

Description

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The invention relates to devices for measuring the width of roll materials and can be used on dressing tables of textile machines.

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

FIG. 1 shows a block diagram of the device; 2 shows the measuring part of the device, a general view.

The device contains two sets of probes 1 and 2, which are mounted on the sides of the moving material 3 and are made in the form of a set of plates. Probes 1 are mounted stationary relative to the even edge of the material, and the probes 2 are mounted on the bracket 4, which with the help of a flywheel 5 and a driving screw 6 moves across the direction of movement of the material to adjust the device to measure a given width

The probes are vertically suspended on a horizontal shaft 7 mounted in the supports of the bracket 4 along the edge of the material and being simultaneously the axis of rotation of the probes in a plane perpendicular to the direction of movement of the material being measured. The probes are made of plates of different lengths, and in the set are completed as their length decreases relative to the axis of rotation with a step equal to a given measurement accuracy (0.5; 1.0; 1.5; 2.0 mm, etc.). The total number of probes depends on the specified tolerance for the deviation of the measured width from the nominal. For example, the tolerance for deviation of width is ± 2.5 cm, and the required measurement accuracy is set to 2 mm. Therefore, the number of probes that measure the width in the tolerance field of 5 cm is 25.

Each probe plate has a corresponding code, made in the form of a hole

ABOUT

about

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The cores are located coaxially with the holes of the other plates of the probes, and the maximum number of holes is made at the plate of the central probe having the maximum length. As the length of the probes decreases, the number of holes in them decreases, and the shortest probe does not have any holes at all. When the probes are located on the same level, all the holes are closed, which corresponds to the maximum width deviation from the nominal, and vice versa, if all the holes of the central probe are open, this corresponds to the maximum width deviation from the nominal value to the smaller. The nominal width of the material corresponds to half of the openings.

Each set of probes is located between the elements of the optocoupler arrays 8 - a set of photodiodes and illuminators, and the number of photodiodes is equal to the number of coaxial holes in the set of probes. The use of probes in direct contact with the material ensures that measurement accuracy is independent of the design and dimensions of the optron arrays.

Probes on shaft 7 are planted freely and hang down under their own weight. On this shaft, the carrier 9 of the cam clutch 10 is rigidly fixed, which serves to periodically engage the probes with the shaft 7 every three quarters of its rotation. An indicator flag 11 is attached to the shaft 7 to turn on the matrix polling synchronizer 12 and generate a resolution signal for reading width deviation information.

The cam sleeve 10 consists of a rod 13, which has the ability to move along the shaft 7 in the housing of the carrier 9 when the cam 14 is exposed to the roller 15. The shaft 7 is driven from the electric drive 16 through bevel gears 17 and 18 and cylindrical gears 19.

The structure of the device includes support plates 20 on which the optical arrays 8 are mounted. In this case, one plate is fixed on the bracket 4, and the other on the machine case. Plates are needed to create a bearing surface for the material in the measurement zone to eliminate possible material deflection under the weight of the probes.

In addition, the device contains an information processing unit comprising blocks 21 and 22 for generating signals of opto-matrix arrays 8, which are connected via decoders 23 and 24 to an adder 25, block 26 for generating a signal of a matrix polling synchronizer, the output of which is connected to an adder 25, connected in series the threshold element 27, the adder 28. the decoder 29 and the block 30 of the display. To the input of the adder 28 is connected master 31 width of the material. Moving material

carried by transport rollers 32.

The measurement of the width of a material is based on the determination of its deviation from a given value, i.e.

W | W3 + ASH | + DSU,

where w | - the current value of the width for each given linear coordinate in the course of the material movement;

W3 - the specified value of the width (pinhole);

LW, AW - measured deviation L to the left and to the right as the material moves. Thus, the task of measuring the width in a given tolerance field is reduced to

the definition of A sh and l sh

The device works as follows.

Before starting the measurement, the probes 2, fixed on the bracket 4 together with the optocoupler matrix 8, are set using the flywheel 5 so that the edges of the material with a nominal (pawl) width are in the middle between the longest and shortest plates of the set of probes, both movable and fixed at the time of their horizontal position across the edges of the material. Material; tucked between transport rollers 32 and starts

to move. At the same time, the electric drive 16 is turned on and the shafts 7 of the probes 1 and 2 begin to rotate through the gears 17-19. In this case, the rod 13 of the cam clutch 10 acts on the freely suspended

on the shaft 7 probes and translates them from the lowest to the highest vertical position.

Then the rod 13 rotates the probes at an angle of 45 ° and, simultaneously moving

along shaft 7, it moves away from the test leads, which continue to rotate under the force of gravity from top to bottom and fall on the edge of the material. Depending on the deviation of the width of the material from the nominal, a part of the probe plates remains on the material, and the rest with a length shorter than the distance from the axis of rotation to the edge of the material, reach their initial lowest vertical position, where they are picked up by the rod 13

5 and begin a new turn.

Thus, the cam clutch 10 every three quarters of the revolution of the shaft 7 carries out its engagement with the probes.

The remaining on the material plate probes form a set of coaxial holes through which the optocoupler matrix 8 form a certain set of signals. Signals from the left and right edges are fed to the inputs of blocks 21 and 22, and from them to decoders 23 and 24, where they are converted into codes that are fed to the input of adder 25. Addition of codes occurs at the time when the probes lie on the material, when triggering of the synchronizer 12 interrogation of matrices, the signal of which through block 26 goes to the adder 25 through each turn of the shaft 7. The code obtained as a result of the addition goes to the threshold element 27, the value of which corresponds to the specified code values of the nominal width of the material, and the current deviation from .v The output of the threshold element 27 is supplied to the adder 28, where it is added to the initial material width code, which is entered into the material width sensor 31 before the measurement begins. The resulting code through the decoder 29 enters the display unit 30, which shows the current value of the width of the material.

The rotation frequency of the electric drive 16 is varied, it is possible to vary the frequency of measuring the deviation of the width from the nominal, i.e. set the required measurement interval along the length of the material.

Claims (1)

Invention Formula A device for measuring the width of a moving material containing perpendicular to its direction motion probes in contact with the surface of the material, optocoupler arrays, outputs associated with information inputs of an information processing unit, having a material width setting unit and a setup input associated with a matrix polling synchronizer, and output with an indication unit, characterized in that accuracy of measurement, it is provided with shafts located on different sides of the material and parallel to its movement, and the probes are made in the form of a set of perforated plates of various lengths, vertically suspended on the shaft rotatably around them in a plane perpendicular to the direction of movement of the material, while the lengths of the plates lie within the measurement range, the optocoupler arrays are arranged to intersect their optical axes with plates, and the information processing unit has first and second decoders and serially connected first adder the threshold element, the second adder and the third decoder, and the information inputs of the first adder are connected via the first and second decoders respectively to the optocoupler outputs s matrices, and the installation is an installation input input information processing unit, the second adder corresponding input connected to the output setpoint width of the material, and the third decoder output is the output of the information processing unit. 20 ./ ten §Ig2