RU1805280C - Device for measuring lengths of materials by method of spinning - Google Patents

Abstract

The invention relates to measuring technique and can be used to measure lengths of materials. SUMMARY OF THE INVENTION: the device consists of a measuring roller mounted on a movable traverse attached to the housing. A magnetically adjustable sensor is placed on the traverse, the signals from which are fed to the shaper associated with the directional discriminator. The outputs of the latter are connected via single vibrators with keys that are connected to the inputs of the control unit of the computing unit. 2 s.p. f-ly, 3 ill.

Description

The invention relates to measuring technique, namely to means for measuring lengths by the rolling method of a roller, and can be used to measure the lengths of various materials, in particular in light industry for measuring lengths of fabrics of a wide range.

The purpose of the invention is to increase the accuracy and productivity of measurements by eliminating errors and taking into account the thickness and structure of the measured material.

In FIG. 1 shows a structural diagram of the proposed device; in FIG. 2 is a block diagram of a direction discriminator; in FIG. 3 - diagrams of pulses at the outputs of the blocks, explaining the operation of the proposed device.

The device comprises a measuring roller 1. whose axis is mounted on a traverse 2. movably mounted on the housing 3. On the end surface of the measuring roller are 2p permanent magnets 4 with alternating poles, where n is the number of pairs of magnets. In the field of action of the magnets, magnetically sensitive elements 5 are fixedly mounted on the traverse 2, for which, for example, reed switches or Hall sensors can be used,

The pulse shaper 6 is connected to the outputs of the first and second magnetically controlled elements 5. The pulse shaper 6 generates rectangular pulses with a steep front and can be performed on Schmitt triggers.

The first and second outputs of the pulse shaper 6 are connected respectively to the first and second inputs of the direction discriminating unit 7.

The direction distinguishing unit 7 generates the passage of pulses at one of its two outputs, depending on the direction of rotation of the measuring roller 1 — when rotating Forward — the pulses are present only at the first output, and when

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rotation back - pulses are available only at the second output of the block. The direction distinguishing unit 7 is made on logical elements 21/1-NOT with inversion (Fig. 2). The first and second outputs of the direction distinguishing unit 7 are connected respectively to the inputs of the first and second single vibrators 8, 9, the outputs of each of which are connected respectively to the inputs of the electronic keys 10 and 11,

The electronic keys 10 and 1.1 are made on transistors, the electronic key 10 being connected to the + key of the control unit 12 of the computing device 13, and the electronic key 11 to the key - of the control unit 12 of the computing device 13. The computing device 13 is a non-programmable microcalculator.

The output of the computing device 13 is connected to the indicating unit 14. As a computing device, a microcalculator such as Electronics BZ-37, Electronics VZ-02 and the like can be used.

Before the device starts to work, a correction factor K is introduced into the control unit of the computing device, which determines the length of the measured material per one pulse generated by the sensor 5.

For this, a small piece of measuring material, the length of which has been previously measured with an accuracy of 1 cm, is passed through a length measuring device. 1. 1. The number of pulses Ne per the length of the piece of material I.

I Coefficient to. is entered in calculate

body device 13 in the form of a constant.

The device operates as follows.

On the case 3 of the measuring table, on which the measured material is moving, a measuring roller 1 is installed. When the roller rotates, the magnetic field of the scattering of permanent magnets 4 is closed by the contacts of magnetically controlled elements - reed switches 5, which, when triggered, provide signals to the input of the former 6 . Shaper 6 generates rectangular pulses with a steep front (diagrams a, b).

Next, the pulses are fed to the direction distinguishing unit 7, where the rectangular pulses are differentiated by CiRiRan С2ВзР circuits (Fig. 2), negative differentiated pulses (diagrams c, d) are extracted by the bias circuits RiR2 and RsR4, inverted by the elements DDi, DD2 and fed to the inputs of the logic elements ООз, DD4) of the diagram e, e) together with the output rectangular pulses from the pulse shaper 6.

When the measuring roller 1 is rotated forward, logic 1 arrives at the inputs of the OOz2I-NOT element, and short negative logical O pulses are generated at the output (diagram, f). At the same time, 1 and O arrive at the inputs of the element DD4, while 1 remains at the output, i.e. the signal does not pass (diagram h). Thus, when the measuring roller is rotated Forward, pulses are present only at the output of the element DDs, and when the roller is rotated Back, only at the output of DD4. Depending on the direction of rotation of the roller, negative pulses are fed to the input of one of the single vibrators 8 or 9.

A single-shot triggered by negative pulses generates positive pulses of a fixed duration (diagram i), which are fed to the input of the transistor switch 10 and 11. The transistors of the electronic keys 10 and 11 are connected in parallel with the + and - keys of the control unit. 12 of the computing device 13. Thus, if you first dial 1 on the microcalculator 13, then when the measuring roller 1 rotates forward, a sequential addition of units will occur, i.e. counting the number of pulses Ne of the sensor 5. When the measuring roller 1 is rotated backwards, sequential subtraction is performed. The measurement result in units of length is displayed on indicator 14.

Introduction before starting operation of the device in the control unit 12 constants

to JT- corresponding to a certain

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type (structure) of the measured material, allows you to get the length I k-Ne on the indicator 14 by automatically sequentially adding the coefficients K. The introduction of the correction factor K takes into account the errors introduced by the measuring roller - measured material - sensor system. Changes in the diameter of the measuring roller due to wear during operation are taken into account by periodically calibrating the device described above.

The implementation of the sensor on magnetically controlled elements also allows to minimize the error from interaction

a roller with a measured material due to the ease of its rotation and slight pressure on the fabric, unlike mechanical ones. This is also facilitated by the installation of a measuring roller on a movable traverse.

Claims (3)

SUMMARY OF THE INVENTION 1. A device for measuring lengths of materials by rolling method comprising a housing, a measuring roller fixedly mounted on the housing, a roller angle sensor connected to the measuring roller, and an indicator, characterized in that, in order to increase the accuracy and productivity of measurements by to eliminate errors and take into account the thickness and structure of the measured material, it is equipped with a pulse shaper connected to its output by a direction distinguishing unit, two single-vibrators, two key E elements and computing unit, input formiropa5 5 ltsli. 3 of the pulse bodies is connected to the sensor output, the first output of the direction discriminator block through the first one-shot and the first key element is connected to the first input of the control unit of the computing unit, and the second output of the direction discriminator block through the second one-shot and the second key element is connected to the other input of the control block computing unit. 2. The device according to claim 1, with the exception that the roller angle sensor is made in the form of permanent magnets mounted around the circumference of the roller, and magnetically controlled elements located in the field of constant magnets. 3. Device pop. 1, characterized in that it is equipped with a traverse movably mounted between the housing and the measuring roller.