SU1420348A1 - Device for measuring length of moving articles - Google Patents

Abstract

This invention relates to instrumentation technology. The purpose of the invention is to increase the accuracy of receptor length measurement regardless of the total length of the product. The signal reflected from the iBt / ir of the product is converted by the photoreceiver 11 into a pulse, which is determined by the full length of the product, and from the output of the product identification unit 9 to the inputs of the cycle register 10 and the logic node 8, the operation enable pulses arrive. The latter permits the passage of clock pulses to the input of counter 16 until its volume is completely filled, after which the counter 16 generates an overflow pulse and the counter 17 begins to fill until the moment the pulse slice arrives at the input of the logical node 8. The counter 15 is reset and on arrival nextFl.d

Description

the signal from amplifier 12 through node 8, the filling operation to its volume is repeated again. This happens until the register of the 10th cycle is filled, after which you -. The following actions are completed: the operation of the counters 15 and 17 is blocked, the operation of the counter 18 is permitted, a write pulse is generated, according to which

information is copied from counter 17 to counter 18. Node 8 permits the passage of clock pulses. At the moment of filling the counter 15, a transfer pulse is formed, the node 8 switches the passage of the clock pulses to the input of the counter 18, which subtracts them, thereby forming the receptor length of the product. 5 il.

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The invention relates to instrumentation technology and can be used, for example, in controlling the length of the movement of parts.

The purpose of the invention is to improve the accuracy in measuring receptor length by increasing the reliability of receptor length, independent of the total length of the product.

FIG. 1 and 2 are block diagrams of a device for monitoring moving parts J in FIG. 3 shows time diagrams of the device operation; FIG. 4 and 5 is an example of the choice of receptor length.

A device for controlling the receptor length of moving parts contains a generator 1 of the reference frequency, a logic unit 2, a reset unit 3, a sensing element 4, an emitter 5, a controlled product 6, a counting unit 7.

Logic block 2 contains logical node B, block 9 of product identification, register 10 of the cycle. The reset unit is designed as a trigger. The sensing element 4 includes a photodetector 11 and an amplifier 12. The emitter 5 includes an illuminator 13 and a spreading unit 14. The counting unit 7 includes counters 15, 16, 17, 18.

The device works as follows.

In the initial state, in the absence of a product in the inspection zone, at the output of amplifier 12 and the outputs of logic node 8 there is a signal O. Moving along its axis of rotation, product 6 enters the inspection zone and

is illuminated by the illuminator 13, the beam of which is turned in the direction of the unwrapping unit 14, the length of the string is obviously greater than the measured item.

5 The signal reflected from the product is converted by a photodetector 11 into a square-shaped pulse (Fig. 3, plot 2), which is determined by the full length of the product. The signal enters through the switch 12 to the node 8, unit 9, the identification of the parts and the register 10 of the cycle. The reference frequency generator 1 generates synchronizing pulses that are fed to the inputs of logical node 8

15 and the product identification block 9 (Fig. 3, plot 1). With full illumination of the product and the onset of the identification cycle, the product in the zone from the output of the product identification unit 9 to the register input

0 10 cycles and the input of the logical angle 8 receive the enable signal of the register of the 10 cycle (RG) and logical node 8 (Fig. 3, plot 3).

At the time of arrival of the signal front.

25

reflected from the monitored product 6 from the output of amplifier 12 to the input of logical node 8 (Fig. 3, plot 2), the latter allows the passage of clock pulses to the input of counter 16

(Fig. 3, epher 4), until its volume is completely filled. At the moment of filling the counter 16 at its output, according to a Wits transfer signal (Fig. 3, plot 5), according to which the logical node B with

its arrival at the input switches the input clock sync pulses to feed them to the input of pulse counter 17 (Fig. 3, plot 6), which is filled before the moment of arrival of the pulse to the input of the logical node

8 and the filling of the volume of the counter 17 stops. At the same time, the counter 15 is set to the input, flowed to the initial (programmed) state (Fig. 3, plot 7) and Upon the arrival of the next signal from amplifier 12 through the stroke of the node 8 and its output operation filling to its volume is repeated. This occurs until the volume of the register of the 10th cycle is filled, and at the moment of filling up the register 10, the cycle signal (Fig. 3, Eugur 8) for which the logical node 8 performs the following actions is completed at its output: through the output it blocks the operation of the counter 15 (Fig. 3 plot 7) and enables operation of the counter 15 via the output (Fig. 3, plot 9), blocks the operation of the counter 1 7 through the output and enables operation through the output of the counter 18, generates a write pulse through the output to the input of the counter 18 (Fig. 3, plot 9), which is a census of information from older bits with etchika 17 into the counter 18. At the arrival of the next (after activation cycle signal) from the output signal of amplifier 12, a logic unit 8 allows passage takto- O pulses output from the generator 1 to the input of the shift counter 15 (Fig. 3, curve 10). At the moment of filling the counter 15, a transfer signal is generated at its output (Fig. 3, plot 11), through which trigger 3 is switched and position 1 is set (Fig. 3, plot 12), and node 8 switches clock pulses from output to output for supply to the input of the counter 18 (Fig. 3, plot 13), which subtracts them, thereby forming the receptor length of the product. At the moment of filling the counter 18 at its output, the transfer signal is transmitted (Fig. 3, plot 4), which returns the trigger 3 to the state O, i.e. from the output of trigger 3, a U-shaped signal is received, determined by the sum of the clock pulses of the volume of counter 4. At the moment the slice of the signal from amplifier 12 arrives at the input of logic node 8, the latter generates a setup signal (Fig. 3, plot 9) to the initial state counter 16, which arrives at its input and the output recording signal arrives at the input of counter 18, which provides preparation for the arrival of the next signal from amplifier 12, and upon its arrival,

five

five

5 0 5 0 5

pulse procedure of forming the control zone is repeated again until the moment when the controlled product leaves the recognition zone, i.e. The pitch signal from the output of the recognition unit 9 (Fig. 3, plot 3) is active.

Cutting off the signal at the output of block 9, the logical node 8 with a signal from the output (Fig. 3, plot 15) resets the register 10 of the cycle (RG), the scramblers 17, 18, and the trigger 3.

Length control occurs in two cycles: the first measurement cycle, the second formation cycle.

If it is required to measure a cylindrical product with the length L and the receptor length L (Fig. 4), then in the first cycle the signal at the output of the register 10 of the cycle is passive; trigger 3 is blocked, and counter 15 is programmed for one or two tolerances via the data bus (SM), depending on where the receptor length is to be measured at the beginning of the length of the product, in its middle, or taking into account the two extreme tolerances.

The outcome of FIG. 4, 2D L-L is converted for ease of reference length, as shown in FIG. five.

The meter 15 is programmed through the SD for tolerance measurement 2 and the number of clock pulses equal to n, and the length L is determined by the number of clock pulses M.

B the moment of arrival of the front of the signal reflected from the monitored product, the logical node 8 allows the passage of clock pulses to the input of counter 16, which begins to read them before its programmed volume p.

After the counter 15 is filled at its output, the transfer signal is transmitted through the logical node 8 to counter the incoming clock pulses of the counter 17, which counts them until a pulse is cut from the test item. The number of clock pulses in this case corresponds to the number M. Therefore, the length 2 a and length L are measured, respectively. At the same time, the counter 15 returns to the initial state for a programmed number of pulses equal to n. In order to obtain a reliable estimate of the measurement of length 24 and L, the described cycle of the measurement procedure is repeated several times. The cycle is determined by register 10 cyc51A20348

lov, i.e. multiple measurements occur to average the score.

At the time of filling in the register of 10 cycles, the latter generates a control signal, which through logical node 8 blocks the operation of counter 15, counter 17 and enables operation of counters 16 and 18. In this case, information from counter 17 is copied to counter 18 until it is completely filled. Upon the arrival of the next signal reflected from the measured item

whether, the logical node transmits clock pulses of information into counter 16, the volume of which is pre-programmed through the control panel for the number of pulses n proportional to, for example, the length of / S. At the moment of filling the volume of the counter 16, a transfer signal is generated at its output, through which the logical node 8 sends clock pulses to the counter 18, and at the same time the same transfer signal sets the trigger 3 to position 1. The pulses are deducted by the counter 1 until its volume is completely released after which, at the output, a transfer signal is transmitted that returns the trigger 3 to the initial state o, and in the trigger code 3 a rectangular waveform is formed that executes the defined sum of clock

 volume counter pulses 18.

I

Since the beginning of the subtraction of the counter 18 begins after the filling of the counter 16, and the end of the subtraction is determined by the amount of information from the counter 17, the goal of separating the receptor length and measuring it is achieved.

By programming counters 16 and 15, it is possible to determine any position of the receptor length over the full length of the product and measure it (Fig. 4).

Claims (1)

Invention Formula A device for controlling the length of moving Products, containing a sensing element connected to it by the first input logic unit, a reference frequency generator, radiated: five 0 five 0 five 0 five 0 Tel, the input connected to the first code of the reference frequency generator, the second output of which is connected to the second input of the logic unit, and a reset unit, two inputs respectively connected to the first output and the third input of the logic unit, characterized in that, in order to improve the accuracy in measuring the receptor length, it is equipped with a counting unit, made in the form of the first, second and serially connected third and fourth meters, the output of the last meter is connected to the third input of the reset unit, the output of which is the output of the device, and the logical unit is designed as a logical node, a product identification unit and a cycle register, an output connected to the first input of the logical node, the third output of the reference frequency generator is connected to the second input of the logical node, the third input of which is the first loop register and the product identification unit is combined and is the first input of the logic unit, the second input of which is the output of the product identification unit, the output of which is connected to the second cycle register input and the fourth input unit, the first output of which is connected to the third input of the cycle register, the first input of the third counter and the second input of the fourth counter, the second and third outputs of the logical node are respectively connected to the second and first inputs of the first counter, quarter and fifth outputs of the logical node are respectively connected to two the inputs of the second counter, the output of which is connected to the fifth input of the logical node, which is the third input of the logical block, the sixth and seventh outputs of the logical node, respectively, are connected to the third input of the fourth counter and the second input of the third counter, the output of the first counter is connected to the sixth input of the logic node, the fifth output of which is connected to the fourth input of the fourth counter. Off "I EG controlled product Faye.1 DOF 2L L feed.5