SU555341A1 - Device for measuring the twist of the threads - Google Patents

Description

one

The invention relates to a measurement technique, in particular for determining the alternating twist of moving threads.

The known mechanical twister, designed to control the twist of the yarn during the production of yarn, contains a rotating clip and measuring instrument l.

However, the well-known mechanical tool operates on the principle of destructive contour.

The closest to the invention is a rotary clamp with rotating clamps for making a sample, a counter and a photoelectric sensor, which actually serves as a sensor for the beginning and end of the reference. The twist measurement is made according to the number of revolutions of the rotating clip. In this case, the sample is first unwound to complete a paoloalleysapia of the fibers, and then, continuing to rotate in that. the same direction, twists the thread to obtain the initial length of the sample L2.

The disadvantage of such a twist is that unwinding and twisting

the threads adversely affect the latter on their structural characteristics.

The purpose of the invention is to determine the alternating twist of the moving threads.

This is achieved by the fact that the recording circuit contains an amplifier, a forg gargator and an ampillary extraction unit, as well as a pulsed confirmation unit, a twist direction indicator, a length measure reference unit, a coincidence circuit and a twist calculation unit, with one output of the wide selection unit the pulse is connected to a wide pulse confirmation unit, and the second is connected to a coincidence circuit, the second input of which is connected to a wide pulse confirmation block, and the output of the coincidence circuit is It is connected to the twist direction indicator, and the counter output is connected to the twist calculation unit, to the second input of which the length measure reference unit is connected.

Fig, 1 is given a block diagram of the proposed device; in fig. 2-thread alternating twist; in fig. 3 - a thread with possible intersections of the neutral section with elementary threads; in fig. 4 - timing diagram of the signal at the output of the imager.

The device contains an optical unit 1, 5 having a light source 2 mounted for movement along a curvilinear groove of a guide 3 (to enable operation with threads of different diameters), lens 4, lens holder 5, photodetector 6 and electronic processing circuit the signal that contains the amplifier 7, the driver 8, the wide pulse extraction unit 9 corresponding to the neutral portion of the self-winding thread, 10 confirming the presence of a wide hole, the matching circuit 11, the twist direction indication unit 12, the block 13 of the initial installation of the twist direction and the counter 14, the block 15 of the measure of the length and the block of calculation 16. At the same time, the output of the imaging unit 8 is connected to the input of the extraction pulse block 9, the output of which is connected to the coincidence circuit 11 and the counter 14. The output of the circuit the match 11 is connected to the twist direction indication unit 12 25.

The device works as follows.

Continuously moving the filament modulates the luminous flux focused on the zone, and the reflected flux enters the photodetector 6. Amplifier 7 amplifies the received pulses, and the former 8 generates rectangular pulses that enter the broad pulse extraction unit 9 and the 35 counter. Upon the arrival of a wide pulse, it would be possible to transfer the counter to O and thereby prepare for counting the number of torsions of another direction, also shifting the twist direction indication circuit. 40

However, in the roll-up yarn, the neutral portion also has the attachment point or the place where two strands meet, i.e. approximately in the middle of the neutral section there may be a surge, and both the counter and the twist direction indicator will respond to this false signal. In order to eliminate the false alarms of the counter and the indicator, the device is equipped with a block for confirming the presence of a wide pulse a, under the key to the coincidence circuit.

The functionality of the device is not limited to this. Since a twist is the number of twists per unit length, the device has a unit of 15 units of measure of length 55.

The unit of measure of the length gives a signal about the passage of a predetermined (but with the possibility of adjustment) of the length segment. In the block calculation osustest-ZD

is the operation of correlating counter data to a unit of length, i.e. as a result, a true twist is obtained, and by any means known in the known manner, for example visually, the information is removed.

As it follows from the diagrams shown, the section of the thread where there is no reciprocal circle (the neutral section) can have intersections of filaments that will cause a false signal. In order to avoid this, the wide impulse confirmation unit will generate a signal only when the calculating unit 16 is connected to the counter and the unit 15 for measuring the length. In order for the device to work with filaments of different diameters, the light source together with the lens is mounted so as to move along a single-groove groove. FIG. 2.3.4 letters a and b denote areas with different directions of twist.

Tests of the proposed device have shown that this structural scheme for alternating twist of moving threads without disturbing them improves the accuracy of studying the twist of the thread.

Claims (2)

1. USSR author's certificate No. 282731, M. 01 N 3/22, 27.11.6 2. GDR patent number 62177, class 42 to 50 1973.