SU1482984A1 - Method of automatic control of the tension of group of threads - Google Patents

Abstract

The invention relates to the textile industry. The purpose of the invention is to simplify the management process. The adjustment process consists in comparing the number of threads whose tension exceeds the upper allowable tension limit T _in with the number of threads whose tension is below the lower allowable tension limit T _n . The difference signal of these numbers from the output of the comparison circuit 12, as well as the signals of the sum of these numbers from the outputs of the adder 13 and the storage counter 14, through a logical block 15 affect the controlled power supply 16 connected to the inputs of all inhabitants of the nitenate 17. an increase or decrease in the current in the chain of nitenate residents 17 and accordingly changes the number of filaments whose tension exceeds the permissible limits, try to reduce this number to a minimum. 2 Il.

Description

The invention relates to the textile industry.

The purpose of the invention is to simplify the management process.

Figure 1 shows a system for implementing the method; figure 2 - graphs illustrating the effectiveness of the proposed method.

To implement the method can be

A control system containing scanning measuring means 1 is used, which includes a sensor

2 thread 3 and sensor 4 in the position of measuring the tension of the thread 3. Counter 5 the number of strokes of the measuring means 1 across the thread web

3cb is occupied with the inputs of the information processing unit 6 and the setting unit 7 of the allowable Upper t and lower TH limits (levels) of the tension of each thread.

The output of the setter 7 is connected to the sensor.

4natalized, output connected

to the input of block 6, also connected with the output of the sensor 2 of the presence of the thread. The outputs of block 6 are connected to the inputs of counters 8 and 9 associated with indicators 10 and 11, respectively. The outputs of the counters 8 and 9 are connected to the inputs of the comparison circuit 12 and the adder 13. The output of the latter is connected to the input of the memory counter 14 and connected to the first input of the logic unit 15, and the output of the memory counter 14 is connected to the second input of the logic unit 15. The outputs of the logic unit 15 and The comparison circuits 12 are connected via a switch (p) to the input of a controlled power supply 16, the output of which is connected to the body of electrically controlled nitenate residents 17, the number of which in the system

the theme corresponds to the number of threads 3 in the base fabric.

Figure 2 shows the static distributions of the tension of the threads in the base fabric before (graph 1) and after (graphs 2 and 3) of regulation, where the n axis of the abscissa indicates the tension of the threads (T), and the ordinate indicates the number of threads (N ).

The system for automatically controlling the tension of a group of threads works as follows.

Scanning measuring means 1 is driven by an actuator (not shown is moved across the warp of the warp, formed by thread 3, and sensor 4 alternately contacts each individual thread 3, whose presence in the control zone is determined by sensor 2. Stroke counter 5 depending on the direction movement of the measuring means I alternately Forms on the setter 7 the value of the upper (t) or lower (Tn) tension level of the filaments 3, which is transmitted to the sensor 4. Therefore, when the system is running, for each, for example, even, pass The number of threads in the warp web, which have a deviation from the upper level (crossed yarns), is measured, and during each odd passage - the number of threads with deviations from the lower set level (loose threads).

In contact with the thread 3 of the sensor 4 of the positional measurement of the tension of the thread, the latter acquires one of two discrete states: O or 1. These signals simultaneously with the signal about the presence of the thread 3 in the control zone from the sensor 2 arrive at the block

5 14829846

6 processing information from the top and bottom of the specified

which is separated by two channel limits.

the current information is transmitted from the fourth pass from the counters 8 and 9 about the number of threads, i have measuring means 1, in logical deviations from the top level of the block 15 a comparison is made

(output a) and from the lower level (you are arrays of numbers from the output of the memory

move B), Digital indicators 10 and 11, counter 14 (sN,) and adder 13

associated with counters 8 and 9, while- (ЈN2). If the condition is met

at each time point, the corresponding ZN ,, SNit, then the output signal is the log relation of the truncated and weakened block 15, formed in

the threads in the base fabric, which may in the previous control cycle, do not need to be used by the staff for manual operation and the switching takes place

interventions (replacement of defective stages in the output range

packages, cleaning tension, etc.). 15 power supply sources 16 in the same on After every even pass measurement.

one tool the contents of the account-If in the next control cycle

8 and 9 is transmitted to the circuit 12, the difference ЈG4 ЈN2) decreases, then

Compare and adder 13. The system will again switch to one information.

from the adder 13, representing the co-20 stage, the power source 16 in this

bout the sum of the number of threads having off-direction.

deviations from the upper and lower lips - If this difference increases, then

of the changed levels, is transmitted to the behind-to-output of the logic unit 15, the remembering counter 14. will change the sign of the signal that

The information from the outputs of circuit 12 of comp-25 will cause the switching of the output nanometer, the adder 13 and the memory memory of the power source 16 to one

counter 14 enters the logical step in the opposite direction of the block 15, at the output of the logical block.

ka 15 associated with controllable ism. This process of finding the optimal

The power supply point 16, depending on the state of the system, continues to

from the state of the system, a signal is generated until the condition

cash in the form of il or O. Output iN.N ,, i.e. these numbers are different

the range of the controlled source is 16 at some given value & K,

The power is divided into several fixes. This ensures minimal

steps, the switching of which is 35 the number of threads having a deviation from

in one direction or another of the implemented limits. In this case, it is not supplied to the control input, depending on which signal has the power supply 16 from the logic output of the comparison circuit 12, on

The block 15 of discrete signals of the corresponding output of the logic block 15 exhibiting polarity of 40 s and the power supply 16 does not receive commands to change the output-Initially after turning on this -Go voltage.

After the second pass, if due to disturbances acting on the control device 1 relative to the control system, if the base web at the output of the 1245 circuit is shifted to the optimum and the comparison is again formed, the condition is fulfilled, then a signal (± 1, O), reflecting the corrective action of the control action, worn between the worn and the rest to restore the optimum, as if by bent yarns. This signal is repeated at the beginning of the operation of the system, at the output of logic unit 1550, is determined by the sign of the signal at the output and affects the controlled source of the comparison circuit 12, which is given in the power nickname 16, giving the command one step of its logical unit 15. Further upstream (+1) or the operation of the control system down (-I), which leads to correspondingly -55. When searching for optimum, analogously to an increase or decrease in the process, the current in the nitrate – carbon circuit 17, and accordingly, the ratio-adjustment process illustrates the number of threads having a deviation in FIG. 2 in the position of the curves of the statistical distribution of the tension of the threads in the base fabric. The adjustment allows the distribution curve to be moved from position (1) to position (2), when the location of the largest number of filaments (the area along the distribution curve) in the specified tension limits is ensured.

Since in this case the number of threads with tension deviations from the specified limits is minimal, the scanning measuring tool 1 can be switched to the mode when it signals the location of the threads having tension deviations. Elimination by staff of the causes of deviations (especially those that cause unacceptably large deviations) reduces the variety of threads in the base fabric and thus narrows the distribution curve of the tension of the threads (curve 3 in Fig. 2).

The described optimal control system, as can be seen from Fig. 2, is most effective in the case of an asymmetric distribution of the tension of the threads in the base fabric. For the assortment of threads, which in the base fabric can have symmetric tension distributions, in particular, a normal, accepted optimization criterion — the minimum of the sum of the number of threads that have tension deviations from the specified limits — is similar in its meaning to the minimum difference of these numbers.

The operation of comparing the number of threads exceeding the upper limit —N (Tfc) and the number of threads having a tension less than the lower limit —N (TH) is carried out by the comparison circuit 12. Therefore, in these cases, the systems are provided for disabling the logical

unit 15 and the input to the input of a controlled power supply source 16 of the signal directly from the output of the comparison circuit 12.

Claims (1)

Invention Formula A method for automatically controlling the tension of a group of threads, mainly on the warp mapine, consisting in sequential cyclic measurement of the tension of each thread, in determining the deviation of the measured tension value relative to the allowable upper and lower limits of tension, and in forming a control effect on the tension change characterized by that, in order to simplify the control process, after determining the deviations of the measured values of the thread tension relative to the permissible limits, determine accordingly, the number of threads whose tension is greater than the upper and lower lower allowable tension limits, compare the obtained values, determine their total number and memorize it in each measurement cycle, according to the comparison results, in the first measurement cycle all threads, then, starting with the second cycle.measures compare actual and memorized in the previous cycle The total number of threads, the tension of which is outside the permissible limits, according to the results of the comparison, forms a controlling influence on the change in the tension of all the threads, minimizing the total number of threads whose tension falls outside the permissible limits. Compiled by B.Kisin Editor M.Petrova Tehred M.Didyk Corrector M.Maximiyinets Order 2789/23 Circulation 413 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 FIG. 2 Subscription