SU1622259A1 - Apparatus for controlling winding machines - Google Patents

Abstract

This invention relates to the pulp and paper industry. The purpose of the invention is to improve the control accuracy by taking into account the cut turns of the paper web. When the paper web is being wound, the trigger 8 is in the state 1 and on each turn of the roll in the counter 4 the number of pulses fB is recorded, which is proportional to the hr Roll length of the turn on this turn. The contents of counter 4 are rewritten into reversible counter 5, after which counter 4 is zeroed and the CECC; recording resumes. When the paper web is broken, the trigger 8 is set to the O position, prohibiting the passage of pulses fB and the reset pulse to the inputs of counter 4 and allowing the passage of pulses fn to the input of counter 5, in which information about the length of the coil at the moment of break is recorded from this counter 4. After removing the breakage and cutting off the paper layers from the roll, on each subsequent roll turn, the number stored in the counter 4 will be overwritten from which the fB pulses coming to the counter 5 will be subtracted into the counter 4. This will happen until then. until the number of pulses fB is comparable to the number stored in the counter 4, and the overflow output of the counter 5 does not generate a pulse that sets the trigger 8 into one state and thus brings the device back to its original state. 2 Il. Oh h:

Description

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The invention relates to the pulp and paper industry, more specifically to devices for determining the length of a paper web wound into a roll.

The purpose of the invention is to improve the control accuracy by taking into account the cut turns of the paper web.

FIG. 1 shows a block diagram of the device; in fig. 2 - temporary potential diagrams appearing in the operation of the device.

The device contains a sensor 1 roll turn, a sensor 2 turns of the carrier shaft, a sensor 3 paper breaks, a counter 4 pulses and a reversible counter 5, generators 6 and 7 single pulses, RS-flip-flop 8, the element AND NOT 9 and elements 10 - 12, moreover, the output of the sensor 1 rotation of the roll is connected to the first input of the element AND-HE 9 and to the input of the generator b of single pulses, the output of which is connected to the input of the record of the counter 5 and to the input of the generator 7 of single pulses connected to the first input of the element 10 whose second input is connected to the forward trigger output 8 and the second input of the element 11, the first input of which is connected with the first input of the element 12 and the output of the sensor 2 turns of the carrier shaft, and the output is connected to the counting input of the counter 4, the reset input of the element 10 connected to the output, and the bit output is with the bit input of counter 5, the counting input of the subtraction (inverse) of which is connected with the output of the element 12, and the output of the overflow - with the S input of the trigger 8, the inverse of the output connected with the second input of the element 12, and R -input - with the output of the element AND-NOT 9, the second input of which is connected to the output of the sensor 3 cliff.

The device works as follows.

In the initial state (no break) at the output of the sensor 3, the signal O is present, the trigger 8 is in the one state, and the counter 4 is reset.

When paper is wound into a roll, the frequency-fB from the output of the sensor 2 turns of the carrier shaft enters through the element 11 to the counting input of counter 4. At each turn of the roll from the sensor turns the roll 1 enters the pulse fp, which passed through the generator b single pulses rewrites the contents of counter 4 to the reversible counter 5 (at the leading edge fp, fig. 2). and passing through the generator 7 single pulses, generates on the falling edge of the signal from the output of the generator 6 a short reset pulse, which arrives through the AND 10 element at the reset input of the counter 4 and clears it.

Thus, for one roll turn, the number of pulses fe is fed to the input of counter 4. proportional to the length of the coil on this roll turn.

When the web breaks at the output of sensor 3, signal 1 is set, and at the next impulse fp ", the output of the NAND 9 logic element O appears, setting the trigger 8 to the zero state, which prohibits the passage of the reset pulse through the AND 10 element the reset input of counter 4 and the passage of pulses fe to the counting input of counter 4. At this point, counter 4 will contain a number proportional to the length of a coil on a given roll turn, which will be overwritten into counter 5 by a pulse from the output of generator 6.

After cutting off the n-th number of loose layers of the web wound into a roll and removing the break from the output of the sensor 2 of the carrier shaft, pulses with a frequency fB begin to flow through the element 12 to the input of the subtracting account 5 and subtract from the number written in it earlier. When the next pulse after pulse fp arrives at generator 6 in reversible counter 5, the number recorded in it at the moment of break is rewritten from counter 4, then the number of pulses fn proportional to the length of the coil on this roll turn is subtracted from the counter 5. The rewriting cycles from counter 4 to counter 5 are numbers proportional to the length of the coil at the moment of breaking and subtracting from the contents of counter 5 the number of pulses of frequency tv proportional to the length of the coil on a given revolution, continue until then. until the number of pulses fe arriving at the input of the subtraction of counter 5, becomes equal to the number recorded in counter 4 at the moment of break. In this case, a pulse appears at the overflow output of the reversible counter 5, which sets the trigger 8 to its original position 1. By which the circuit is unlocked, i.e. the passage of pulses fD and a reset pulse to the inputs of counter 4 is permitted and the passage of pulses fe to the input of counter 5 is prohibited.

Claims (1)

Claims An apparatus for controlling rewinding machines, comprising a roll rotation sensor, output connected to a single pulse generator input, a carrier shaft rotation sensor, output connected to the first inputs of the first and second elements And a third element And, output connected to the reset input of the pulse counter whose counting input is associated with the output of the first element AND, reversing the counter, the inverse input connected to the output of the second element And, the sensor breaks the paper web and RS-flip-flop. characterized in that, in order to increase the control accuracy by taking into account the cut windings of the paper web, it is equipped with I-NB elements and an additional generator of single pulses, while the outputs of the sensors for roll rotation and paper break are connected to the R input RS flip-flop, the S input of which is connected to the overflow output of the reversible counter, direct 0 the output is connected to the first input of the third element And and to the second input of the first element And, and the inverse output to the second input of the second element I. The output of the main generator of single pulses through an additional generator of single pulses is connected to the second input of the third element And, and the discharge The outputs of the pulse counter are connected to the corresponding discharge inputs of the reversible counter, the recording input of which is connected to the output of the main generator of single pulses. BUT