SU1744154A1 - Knitting control instrument - Google Patents

Abstract

The device is used in knitting machines and comprises a unit for catching and pressing the thread, a mark-reading pick-up (25) and a needle pick-up (2), each of them electrically connected to an amplifier-shaper and to a counter, a pulse generator (28) with a frequency divider, a multiple switch (29) and a digital indicator (31). The device further comprises a decoder (36) provided with a memory block connected between the counter (30) and the digital indicator (31) and a unit (B) which is intended for periodical control of the system functioning during the measuring process and which is electrically connected to the pulse generator and, through a controlled switch (35), to the pick-ups (25 and 2).

Description

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The invention relates to devices for controlling technological parameters of a process in a stay.

The purpose of the invention is to increase the operational capabilities and speed of control.

FIG. 1 shows a device for controlling the process in a low; figure 2 - section aa in figure 1; on fig.Z - needle sensor, fixed in the holder; FIG. 4 shows a needle sensor in section with a connector; FIG. figure 5 is a block diagram of the device; figure 6 - plot of the flowchart.

A device for controlling the process in a low-profile execution in the form of a pistol body 1 connected to the needle sensor 2 via a connector 3.

Pistol-shaped body 1. has a flat wedge 4 and a rectangular area, on the flat side surface of which a recess 5 and a spring-cutter 6 are located, which serves to separate the device with one controlled filament 7 and prevent it from entering the measurement zone by a number of disposed threads.

The thread length meter has a drum 8 freely mounted for contact with the moving thread 7 with marks 9 and a thread clamping unit 7 against the drum 8.

The drum 8 can be made, for example, in the form of a hollow cylinder, and marks 9 - in the form of holes, evenly located on its side surface. The light source 10 is mounted inside the drum 8, and

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photodetector 11 - outside, opposite the source. The working surface of the drum 8, in contact with the thread 7, is made of a friction material.

The clamping unit of the thread 7 to the drum 8 is made in the form of a frame 12 with two thread-tensioning rollers 13 loosely installed on its ends 13. The frame 12 is rigidly connected to the trigger 14 having a built-in magnet (not shown).

The needle sensor is made in the form of a glass 15 of a magnet of a soft material, inside of which an inductor 16 is located, is mounted on a rod 17, also made of a magnet of a soft material. The end of the rod 17 protruding from the sensor is sharpened for the purpose of ease of installation relative to the needle bed 18 of the machine.

Inside the bottom of the glass 15 there is a permanent magnet 19 connected to the rod 17. At the bottom of the glass 15 there is a hole connected to the tube 20, inside which wires 21 are placed, connecting the sensor with the pistol housing 1 of the device through connector 3.

A magnetic stand 22 with position adjustment can be used to install the needle sensor. However, such an installation requires a relatively long time due to the fact that the required accuracy of the needle sensor installation relative to the needle bed 18 (gap) is several times higher than the needle pitch, in the order of several tenths of a millimeter. This is especially inconvenient when servicing different types of machines, KOI and it is necessary to constantly rebuild the position of the sensor relative to the frame of the machine.

Using the device is much more convenient if on each serviced machine a special needle sensor holder is fixed, which is a glass 23 made of non-magnetic material with a hole in the bottom and a rim on the opposite end, on the side surface of which a spring-loaded retainer 24 is in contact with the chamfer , made on the outer cylindrical surface of the sensor needles (cups 15E). In this case, when installing the needle sensor, it is enough to take it by the tube 20 and insert it into the bowl 23 of the holder as far as it will go. The latch 24 presses the needle sensor to the end position and holds it in the holder with high accuracy.

The electronic circuit of the device includes a tag pulse shaping circuit at a fixed interval of the length of the thread, having a sensor of 25 marks and the first amplifier 26, and a needle sensor circuit. having a needle sensor 2 and a second amplifier driver 27, a highly stable pulse generator 28 with a frequency divider and a multiple position dual switch 29, for example, to four positions (aa, bb, v-g, g-d), counter 30 , digital indicator 31, counter 32 and power supply 33, the supply voltage to all circuit elements, except for the circuits of elements 25-26, 2-27, is supplied through a reed switch 34. Power is supplied to the formation of tag pulses (elements 25-26) and the sensor needles (2-27 elements) is fed through a control key 35. Electronic circuit

also includes a memory decoder 36 connected between the counter 30 and the digital indicator 31, the one-shot 37 with the coincidence circuit 38, the one-shot 39 with the second match 40, the match 41 and two RC chains consisting of a resistor 42 and a capacitor 43, respectively and resistor 44 and capacitor 45.

The input of the one-shot 37 is connected to the output of the first field of the dual switch 29, and its output through the match circuit 38 is connected to the input of the one-shot 39, the Overwrite input of the decoder 36 and one of the inputs of the match circuit 41. The output of the one-shot 39 through the circuit 40

matches connected to another input of the circuit 41 matches and the installation input of the counter 30.

The output of the coincidence circuit 41 is connected to

the control inputs of the counter 30 of the control key 35 and the highly stable generator of 28 pulses with a frequency divider.

The second inputs of circuits 38, 40 matches

connected to the outputs of the RC-chains, a common point of which is connected to the power source 33.

The device for controlling the process in the low speed works as follows.

The controlled filament 7 is captured by means of thread guide rollers 13, which, when the trigger 14 is pressed, are moved and when they pull the filament 7 to the surface

drum 8. Thread 7, the passage on the surface of the drum 8, rotates it. Since the lateral surface of the drum 8 is evenly spaced marks 9 in the form of holes, the luminous flux coming from the source 10 of the light will be fed to the photodetector 11 pulses, the number of which

proportional to the measured length of the thread 7.

Simultaneously pressing the trigger 14

built-in magnet, contact closure

reed switch 34, includes power to the device.

The device has four modes of operation:

measuring the linear speed of the machine - aa,

measuring the speed of movement of the thread - 6-6.

measurement of the length of the thread in the loop - in,

Measurement of the thread consumption per one revolution of the circular machine - gd.

In the position of the multi-position dual switch 29 shown in Fig. 5, the device operates in the mode of measuring the linear motion speed of the machine (aa, a). In order to obtain readings near the machine’s needle table 18, it is necessary to install a 2-needle sensor, pull the trigger 14. In this case, a permanent magnet embedded in it will trigger the reed switch 34, and the supply voltage will flow into the device.

As can be seen from the diagrams shown in Fig. B, at the inputs of the circuits 38 and 40 coincidence connected to the RC chains of the elements 42, 43 and 44, 45, at the initial moment of time, the voltage is below the switching level. Therefore, at the outputs of circuits 38 and 40 matches the level of logical zero. The voltage of this level leads to the reset of the counters 30 and 32 to the zero state and overwriting the zeros in the memory of the decoder 36. On the indicators 31, zero readings are induced. When the switching voltage at the input of the coincidence circuit 38 is reached, its state changes from a logical zero to a logical one. This transition prohibits the rewriting of new information in the decoder 36 and triggers the one-shot 39.

The time constant of the RC chain of elements 44, 45 is greater than the RC chain of elements 42, 43. Therefore, the switching of the coincidence circuit 40 will occur later than the circuit 38. This will cause the transition of the coincidence circuit 41 to the logic zero level, which is a resolving state for operation of a highly stable oscillator 28 with a frequency divider, a counter 30, and a control key 35. Generator 28, counter 30, begin to operate, and power is supplied to sensors 25 and 2 and amplifier 26 and 27.

When the circular machine rotates, the needle sensor 2 generates a pulse as each needle groove passes past it. The pulses amplified and formed with the help of the amplifier-maker 27 through the switch 29 fall on the input of the counter 30, which counts these pulses for 1 s. It is at this time that the generator 28 is set up, which, after 1 second after switching on, generates a pulse that triggers the one-shot 37. Pass through the coincidence circuit 38, this signal will prevent further counting, since the coincidence circuit 41 is re-enabled, allowing the counter 30 to work. from the output of the circuit

38 matches will give permission to overwrite the number recorded in the counter 30 in the memory of the decoder 36. On the indicator 31, instead of the zeros, there is a number on which

0 the count of counter 30 has stopped. This number corresponds to the number of needle grooves that have passed the needle 2 sensor in 1 s, i.e. linear speed of the machine.

After the termination of the one-vibration pulse 37, the one-shot 39 is started through the matching circuit 38, which through the matching circuit 40 will cause the counters 30 and 32 to be set to the zero state. Simultaneously, while the one-shot 37, 39, on

0, the output of the coincidence circuit 41 will be the state of the logical unit that stops the operation of the generator 28, disables the counting of the counter 30 and turns off the control key 35, providing a circuit of elements 2.255 27. With the termination of the one-oscillator 37 and 39, the coincidence circuit 41 again comes to logical zero, and the new measurement cycle is repeated.

The total duration of the pulses of single vibrators 37 and 39 can be relatively long, for example 1-2 sec. Then the change of instrument readings will occur every 2-3 s. This time is still not long enough for quick setup.

5 of the machine, but at the expense of turning off with the aid of a controllable key 35 elements 2, 25-27, which, when used as an indicator 31 for a liquid crystal display, are the most energy-consuming

0 elements, the total energy consumption is reduced several times.

In the second position of the multi-position dual switch 29, the device operates in the mode of measuring the speed of thread movement (bb).

The device in this mode works without sensor 2 needles.

To measure the thread speed, just grab the controlled thread 7 and pull the trigger. The power supply is fed to the device.

The signals from the sensor 25 tags through the amplifier-shaper 26 and the dual switch 29 is fed to the input of the counter

5 30.

The device operation in this mode completely coincides with the mode described above, only. Instead of counting the pulses from the 2 needle sensor, there is a counting of the pulses from the 25 mark sensor.

If the tag sensor 25 emits a pulse every centimeter of the length of the monitored thread (a certain position of the marks on the drum), and the generator 28 counts the number of pulses in 1 second, then the indicator 31 will display figures corresponding to the thread speed in centimeters in 1 second.

To work in the mode of measuring the length of the thread in the loop (position in-in, double switch 29), you need to install a sensor of 2 needles near the needle bed 18 of the machine, and to take controllable thread 7 with thread-guide rollers 13 and pull the trigger 14,

The operation of the device in this mode differs from the operation in the mode of measuring the speed of the thread in that the duration of the operation of the counter 30 is determined not by the generator 28, but by the filling time of the counter 32 counting the number of pulses from the needle sensor 2. When a predetermined number of pulses (needle steps) is reached, the output of the counter 32 appears a positive pulse, which stops the operation of the counter 30 and rewrites its readings in the memory of the decoder 36. If the sensor 25 marks produces a pulse every centimeter of the controlled length 7 set to the number 100, the number induced on the scoreboard will be the length of the thread in the loop in units of 0.001 cm or 0.01 mm.

You can determine the thread consumption per machine revolution (the position of the r-g multi-position dual switch 29) by placing the needle 2 sensor near any steel piece passing the sensor once per machine turn, switching the switch 29 to position r-r and grabbing controlled thread 7. At the same time, the input of the one-shot 37 through the amplifier-shaper 27 and switch 29 receive pulses from the needle sensor 2 once per machine turn, and on the indicator 31, indications corresponding to the number of the controlled thread 7 are induced, from odovannoy per revolution of the machine.

Claims (2)

Claim 1. Device for controlling the process in the knit, containing a measure of the length of the thread with sensor tags connected to the first amplifier-shaper, needle sensor connected through the second amplifier-shaper to the input of the first pulse counter, pulse generator with frequency divider, dual multi-position switch, one of the inputs of the first floor of which is connected to the output of the first amplifier-shaper, corresponding the inputs of the second floor are with the outputs of the first pulse counter and the pulse generator with a frequency divider, and the output of the first floor is with the input of the second pulse counter, a control key connected between the power source and the power inputs of the mark sensors and needles and shaper amplifiers, and a digital indicator characterized in that, in order to increase the operational capabilities and control efficiency, it is equipped with a memory decoder connected between the second pulse counter and the digital indicator, one-shot, coincident circuits tions and RC-chain, and the output the second amplifier of the former is connected to the corresponding inputs of the first and second fields of the switch, the output of the second floor of which is connected to one of the inputs of the first circuit through the first one-channel matches, the output connected via the second one-shot to the first input of the second match circuit, the output of which is connected to the setup inputs of the pulse counters and to the first input of the third circuit matches, the output of which is connected to the control inputs of the second pulse counter, pulse generator, and controllable key, the second inputs of the first and second coincidence circuits connected to the outputs of the corresponding RC chains, the common point of which is connected to the output of the power source, and the output of the first coincidence circuits associated with the input. Overwriting the decoder with the memory and the second input of the third coincidence circuit. 2. An apparatus according to claim 1, characterized in that the needle sensor consists of a cup of magnetically soft material in which an inductance coil with a rod of magnetically soft material is placed, and a permanent magnet connected to the rod is fixed at the bottom of the cup. /: ggpf ЬЬ iW-% -n-rm ..-. l - - l --- t- - ™ -J th L Ј / I frsimi / j-gpf 91 rgpf ® S SS $$$ SSS $$$ & 4-91Ш.1 FIG. five FIG b