SU1449846A1 - Device for rejection of defective articles - Google Patents

Abstract

The invention makes it possible to automate the process of controlling the stiffness of the insert fastener in jewelry and to increase its productivity. On the vibrator 2, the base 1 is fixed with rigidly fixed illuminators 3 and photodetectors 4, cassette 5 is installed with jewelery products 6 so that the upper edge of the inserts 7 is tangential to the axial line of the light beam. The vibrations of the vibrator 2 are excited. The stiffness of the fastening of the inserts 7 is evaluated. In the absence of movement of the insert 7 with respect to a rigidly coupled system: illuminator 3 — product 6 — photodetector 4 is a variable component of the current of the photoreceiver. 4 il. with (L

Description

Fi.g.1

The invention relates to a technique for controlling vibrations, in particular, to a technique for determining the stiffness of the insert fastener in jewelery, and may find application in monitoring the stiffness of fastening the constituent elements of products in other parts of the industry.

The purpose of the invention is the expansion of functional capabilities through the detection of defects, fixing the set-ups in three planes. .

Fig and 1 shows a diagram of the device; in fig. 2 - 15 block diagram indicator is functional; in fig. 3 is a diagram of the arrangement of the article relative to the light in FIG. 4 - the position of the base relative to the direction of vibration.

The device comprises a base 1, rigidly connected with the vibrator 2, the illuminator 3 and the photodetector 4, the cassette 5 for fastening the test article 6 with the insert 7 and the block-indicator 8 (Fig. 1). The block indicator 8 includes amplifiers 9, threshold elements 10, triggers 11, pulse generator 12 and display subunit I3

(Fig. 1). Stand 14 is hard for 30

on with base 1 and vibrator 2

(Fig. 4).

The device works as follows. at once.

On the vibrator 2, the base 1 is fixed with rigidly fixed illuminator 3 and the photodetector 4, the cassette 5 with the jewelery is installed —b so that the top insert 7 is tangent to the axis of the beam 15 of the beam 15 (FIG. 3). Vibrator 2 oscillations are excited. The stiffness of the insert attachment is estimated by the variable component of the photodetector current. In the absence of movement of the insert relative to a rigidly coupled system, the illuminator 3 — product 6 — photodetector 4 variable component of the photoreceiver current is equal to

zero.50

When vibrations 2 are excited by the vibrator 2, all component parts of the device begin to vibrate with the exception of the indicator block 8. If the insert 7 in the jewel 6 is not sufficiently rigid, it begins to move under the influence of vibration relative to the frame. Since article 6, illuminator 3, photo receiver 4 constitute a rigid system, the insert 7 moves relative to this system by an amount ± cG, which can be one-tenth or one hundredth of a millimeter. Such movement of the insert 7 causes a change in the degree of overlap by the insert light beam 15, which in turn leads to the appearance of a useful signal, i.e. the variable component of the photocurrent in the photodetector 4. The signal from the output of the photoreceiver 4 is fed to the input of amplifier 9 of the indicator block 8. After amplification, the signal is fed to the input of the threshold element 10, the threshold of operation of which is determined by the magnitude and is set slightly above the level of interference and self-noise 9. From the output of the threshold element 10, rectangular-shaped pulses are fed to the S input of the RS flip-flop 11. At the same time, the R input of the flip-flop 1 receives pulses from the generator of 12 pulses, whose frequency is several times higher than the frequency of vibrations ation. In the presence of a useful signal, the RS-flip-flop constantly switches from one state to zero to vice versa, as evidenced by the blinking of the indicator element of the display unit 13 at a low vibration frequency or steady burning (flashing invisible to the eye) at a high vibration frequency. In the cassette 5 can be set the number of products from one to n in. Depending on the size of the controlled products. For example, for jewelry, it is advisable to choose n 10-20. In connection with this, the indicator indicator 8 has n signal processing channels and each indicator element is assigned a number (from I to n), which allows determining at which positions in the cassette 5 installed defective products.

The use of a photodetector with a maximum spectral sensitivity in the near-infrared region of the radiation of the responder allows the device to be insensitive to the effects of external light when the optical part is unprotected from external light. This relieves the design compared to the known device, which requires such protection of the optical part.

When placing the base - 1 under the 45-direction to the direction of vibration

“G.

FIG A

Claims (1)

CLAIMS A device for the rejection of defective products, mainly jewelry with inserts comprising a vibrator, rigidly associated with the fixed bases there postvil thereon for placing the article, a photodetector, and a flow indicator connected to the output of the photodetector, on the _5: Leech that, in order to expand the functionality by identifying defects in fixing the inserts in three planes, the base is located at an acute angle to the vibration plane, and the product placement means is made in 1 type cassette with a vice for hard