SU737779A1 - Device for measuring the width of moving web - Google Patents

Description

The invention relates to instrumentation and is intended for measuring the linear dimensions of moving flat materials.

A device for measuring the width of rolled material, comprising Li- ₅ Neykov with two groups of photocells, photocells with transmitter information and the registration unit [1].

The disadvantage of this device is the low measurement accuracy and structural complexity. 10

The closest in technical essence the achieved result to the invention is a device for measuring the width of a moving web, containing a ruler with a photosensor, a block of matching circuits, the first inputs of which are connected to ¹⁵ outputs of the photosensors, a memory element, a command issuing unit and a registration unit [2].

The device operates on the principle of sequential interrogation of the states of photo sensors 20. However, at high speeds of movement of the measured material, due to sequential polling of the photo sensors, the dynamic measurement error increases.

The aim of the invention is to improve the accuracy of measurement.

This goal is achieved in that the device is equipped with a shift register, two delay circuits and a clock pulse generator with a key element, the output of which is connected to the clock input of the shift register, and its information inputs are connected to the outputs of the matching circuits, and the output is connected to the input of the registration unit, the output the command issuing unit is connected to the second inputs of the matching circuits and to the inputs of the delay circuits, and the output of each delay circuit is connected to the corresponding input of the memory element, the output of which is connected to the control input of the key th element.

The drawing shows a block diagram of the described device.

The device comprises a line 1 with photosensors 2, a block 3 of matching circuits, a shift register 4, a key element 5, a clock generator 6, a memory element 7, delay circuits 8 and 9, and a registration unit in the form of a counter 10.

The device operates as follows.

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In the initial state from the “blanking” signal, the shift register 4 and counter 10 are set to zero states, and the memory element 7 is set to the state that closes the key element 5, therefore, the signals from the clock generator 6 do not pass to the clock input of the shift register 4. When moving the flat material of the command issuing block (not shown in the drawing), “control” signals are generated periodically. If flat material, such as fabric, patterns, metal, etc., is outside the range of photosensors 2 located across the movement of the material on line 1, then with the arrival of each “control” signal, information is not recorded in shift register .4, since Schemes. block 3 matches are closed. After time T, the delay circuit '8 is triggered, and the memory element 7 switches to the state that opens the key element 5, and the signals from the clock generator b are fed to the clock input of the shift register 4. Since the register 4 information is not recorded, the counter 10 remains in the zero state. After a time equal to T _a relative to the arrival of the signal “control”, the delay circuit 9 is triggered, why the memory element 7 switches to the state that closes the key element 5, and the arrival of clock pulses to the input of the register 4 is stopped. The frequency of the generator 6 is chosen such that during the time Ϊ2.— 15 (7 ^ 7)) the number of pulses is several times greater than the capacity of this register at the input of register 4.

When material ’enters the photosensors coverage area, some of them are triggered, so the next signal“ control ”in register 4 records as many units in the corresponding digits as there were photosensors triggered. After a while, the delay circuit 8 and the memory element 7 are triggered, the key element 5 is opened, and pulses from the pulse generator 6 begin to arrive at the input of the register 4.

The units recorded in the corresponding bits of register 4 begin to move to the right in the register and appear in the corresponding /. · 737779 of the corresponding sequence 'to the input of the counter 10, in which they are summed, and the result is displayed on a digital display. After a while, the delay circuit 9 is triggered, and the memory element 5 is set5 to its original position, the arrival of pulses at the input of register 4 is stopped. With the arrival of each “control” signal, everything is repeated as described. If after each signal “control” the counter 10 is extinguished, then the values of the material width will be recorded in it one by one.

Using a shift register, two delay circuits and a clock generator with a key element allows parallel polling of the photosensors, thereby eliminating the dynamic measurement error.

Claims (2)

(54) DEVICE FOR MEASURING THE WIDTH OF A MOVING DOOR The invention relates to measuring technique and is intended to measure the linear dimensions of moving soft materials. A device for measuring the width of the roll materials is known, comprising a ruler with two groups of photosensors, an information converter from the photosensors, and a recording unit 1.. The drawback of the device is the low accuracy of measurement and structural complexity. The closest in technical essence and the achieved result to the invention is a device for measuring the width of a moving web, containing its ruler with a photo sensor, a block of matching circuits, the first inputs of which are connected to the outputs of the photo sensors, a memory element, a command issuing unit and a recording unit 2. Device It works on the principle of sequential polling of photosensors. However, at large speeds of movement of the measured material, dynamic measurement error increases due to the sequential polling of the photo sensors. The aim of the invention is to improve the measurement accuracy. The goal is achieved by the fact that the device is equipped with a shift register, two delay circuits and a clock pulse generator with a key element whose output is connected to the clock input of the shift register, and its information inputs are connected to the outputs of the coincidence circuit, and the input the command issuing unit is connected to the second inputs of the coincidence circuits and the inputs of the delay circuits, and the output of each delay circuit is connected to the corresponding input of the memory element whose output is connected to the control input of the key item The drawing is a block diagram of the described device. The device contains a ruler 1 with photosensors 2, a block of 3 coincidence circuits, a shift register 4, a key element 5, a clock pulse generator 6, a memory element 7, delay circuits 8 and 9, and a registration unit in the form of a counter 10. The device operates as follows. In the initial state, the blanking shift register 4 and the counter 10 are set to zero states, and the memory element 7 is in the state closing the key element 5, therefore the signals from the clock generator 6 do not pass to the clock input of the register 4 shifts. When moving the flat material of the command dispensing unit (not shown in the drawing), periodically control signals are generated. If a flat material, such as cloth. patterns, metal, etc., is outside the range of photosensors 2 located across the material movement on ruler 1, then With the arrival of each signal, the control in the shift register 4 does not record information, because of the Scheme, block 3 closes. After time t, the circuit 8 is triggered; and, and the memory element 7 switches to the state that opens the key element 5, and the signals from the clock pulse generator 6 arrive at the clock input of the shift register 4. Since the information in register 4 is not recorded, counter 10 remains in the E zero state. After a time equal to Ta with respect to the arrival of the control signal, the delay circuit 9 is triggered, causing the memory element 7 to switch to the state closing the key element 5, and the arrival of the clock pulses at the input of the register 4 stops. The frequency of the generator 6 is chosen such that over time () the input of register 4 receives the number of pulses several times larger than the capacity of this register. When the material enters the zone of action of the photosensors, some of them work, therefore the next signal "control in register 4 is recorded as many units in the corresponding bits as there were activated photosensors. After time Tf, the delay circuit 8 and the memory element 7 are activated, the key element 5 is opened, and the pulses from the generator 6 of pulses begin to flow to the input of register 4. The units recorded in the corresponding bits of register 4 begin to move to the right of the rio register and appear in the corresponding sequence at the input of the counter 10, in which they are summed, and the result is displayed on the digital display. After time t, the delay circuit 9 is triggered, and the memory element 7 is set to its original position, and the flow of pulses to the input of register 4 is stopped. With the arrival of each signal, the control all repeats in the manner described. If, after each signal "control", the counter 10 is enriched, then the widths of the material will be fixed in it alternately. The use of a shift register, two delay circuits, and a clock pulse generator with a key element allows parallel interrogation of photosensors, thereby eliminating dynamic measurement error. An apparatus for measuring the width of a moving platform, containing a ruler with photo sensors, a block of matching circuits, the first inputs of which are connected to the outputs of the photo sensors, a memory element, a command issuing unit and a recording unit, in order to increase the accuracy of measurement equipped with a shift register, two delay circuits and a clock pulse generator with a key element whose output is connected to the clock input of the register, and its information inputs are connected to the outputs of the coincidence circuit, and the output d - to the input of the registration unit, the output of the command issuing unit is connected to the second inputs of the matching circuits and to the inputs of the delay circuits, and the output of each delay circuit is connected to the corresponding input of the memory element whose output is connected to the control input of the key element. Sources of information, taken into account in the examination 1. Author's certificate of the USSR No. 337642, cl. From 01 to 7/32, 1973. 2. USSR author's certificate No. 319656, class: C 01 B 5/04, 1979 (prototype).