SU1608270A1 - Device for automatic monitoring of repeat pattern of articles - Google Patents

Abstract

The invention relates to the control of materials and can be used on textile machines. The aim of the invention is to increase speed. The device comprises an image reading unit comprising a lens 1, a color filter, a spatial light modulator 6, a mirror and a laser with a collimator. The product moves in the control zone of the image reading unit and correlation peaks appear in the photodetector, the amplitude of which corresponds to the degree of coincidence recorded on the frequency filter and the resulting rapport. The amplitude of the signal of the photodetector information processing unit generates a signal to the indicator. 2 Il.

Description

The invention relates to the control of materials and can be used on textile machines.

The purpose of the invention is to increase speed.

FIG. 1 shows a block diagram of the device; in fig. 2 - stress diagrams.

The device contains a lens 1, a product 2 moving in front of it, a source of light 3, a mechanism for moving the product 4, a color filter 5, a spatial light modulator 6, a synchronizer 7, a laser 8, a collimator 9, a translucent mirror 10, lenses 11 and 12, frequency filter 13 and a photodetector 14.

The light source 3, lens 1, color filter 5, spatial light modulator 6, mirror 10 and laser 8 with collimator 9 form an image reading unit.

The information processing unit contains the threshold elements 15 and 16, the pulse front driver 17, the trigger 18, the AND 19 logic element and the delay element 20.

The device works as follows.

The product 2 is moved by the movement mechanism 4 in the control zone of the image reading unit, focused by the object 1 at the input of the spatial modulator 6, filtered by the color filter 5, and recorded when the synchronizer 7 signals are applied to the spatial modulator 6 of the light. Image sizes are ascending rapport sizes. The image is read from the spatial modulator B by a laser 8 with a collimator 9 through a translucent mirror 10. The image read by laser radiation undergoes a correlation processing.

Image correlation processing is performed by lenses 11 and 12 and frequency filter 13, on which a matched Fourier transform of the rapport is pre-recorded. As the product 2 moves in the plane of the photodetector 14, correlation peaks appear, the amplitude of which corresponds to the coincidence degree of the input image recorded on the frequency filter 13 and rapport. The correlation response is transformed by a photodetector 14, separating the envelope of the pulse signals arriving at the speed of reading from the spatial modulator 6. Next, the converted amplitude of the correlation response is compared with two previously set thresholds.

If the output signal of the photodetector 14 exceeds the lower threshold level of element 16, but does not exceed the threshold of element 15, then the pulse generated by shaper 17 passed through the logical element AND 19 (trigger 18 is in zero state), indicating a deviation of the input image from the control. When both thresholds are exceeded, AND 19 is blocked by the output signal of the flip-flop trigger 18. After the output of the photodetector 14 decreases below the threshold level of the threshold element 16, the pulse of the driver 17 delayed by the delay element 20 again sets the trigger 18 to the initial zero state.

The output signal of the device is used to indicate and mark the places where the deviation from the exact reproduction of the rapport occurred within the tolerance determined by the threshold value of the threshold element, the stability of the illumination and the stability of the plane of mixing, of the product 2.

The device may use additional input diaphragms to limit the size of the input image if the product repeat patterns vary greatly in size.

To control multi-color rapport images, several data are set up along a motion path, devices with different color filters.

Claims (1)

Image formula A device for automatic control of product reproduction, comprising a product mixing mechanism in the control zone of an image reading unit equipped with a light source and a lens, a memory unit, a receiver and an information processing unit associated with an indicator, characterized in that speed, it contains a synchronizer, and the image reading unit additionally has a laser with a collimator and a translucent mirror and a color filter arranged in series along the optical axis of the lens and spatial light modulator, memory block is made in the form of a frequency filter, lenses are installed on the optical axes of the input and output, and the information processing unit consists of threshold elements, a trigger, a delay element, a pulse shaper, and a logic element, And, the spatial modulator Sveta the control electrical input is connected to the synchronizer output, and the optical output is connected via a semitransparent mirror and collimator to a laser, and through a memory unit to a receiver, the electrical output of which is connected to the combined inputs of the threshold elements, with the output of the first the threshold element is connected to the input of the pulse generator, the output connected to the first input of the logical ment and through the delay element to the first input of the trigger, the second input of which is connected to the output of the second threshold element, and the output to the second input of the logical element AND, the output of which is the output of the information processing unit. Uc FIG. g