SU144316A1 - Device for checking thread irregularities - Google Patents

Description

Optical devices for monitoring the level of feed pitch are known, including a rewinding device for pulling a controlled filament, a filament illuminator with an optical system, and a photoresistance included in a measuring circuit.

These. The devices have low accuracy due to changes in the electrical parameters of the photoresistance with changes in the ambient temperature and the inconsistency of the luminous flux of the illuminator during fluctuations in the supply voltage and the aging of the light source (for example, an electric incandescent lamp).

The proposed device for checking the irregularity of the filament differs from those described above in that, in order to determine the metric number of a monofilament (for example, caprone) in terms of the luminous flux reflected by it and to increase the measurement accuracy, a second photoresistance is applied to the illuminator through a separate optical a system with an adjusting optical wedge, both photoresistances being included as shoulders in a pavement measuring circuit with an electronic recording device at its output An automatic potentiometer connected by means of a switch directly to the midpoint between the photoresistances when detecting the unevenness of the metric number of the monofilament being tested or through an integrating amplifier when averaging the value of the determined metric number.

These differences, along with an increase in accuracy by reducing the influence of factors such as changes in the luminous flux of the illuminator and the ambient temperature and the elimination of energy consumption from the measuring circuit by the recording device, ensure high sensitivity of the device.

No. 144316-2H on fig. 1 shows optical; in fig. 2 is a circuit diagram of the proposed device.

A thread moving device (not shown in the diagram) provides for the movement of the monofilament / so that the light beam from the incandescent electric lamp 2 formed by the optical system of the illuminator consisting of condenser 3 and lens 4 is focused on the controlled portion of the thread. The photoresistance 5 is located in the place of optimum illumination by the light flux of the reflected monofilament. Another light beam, formed by the second optical system of the illuminator, consisting of a condenser 5, frosted glass 7 and a gray optical wedge 8, illuminates the photoresistance 5.

Both photoresistances are placed in opaque cameras.

The instrument is configured by moving the optical wedge 8.

The electrical circuit of the instrument (Fig. 2) provides measurement and

registration of changes in the light flux reflected by the monofilament,

proportional to the change in its diameter.

From the diagonal of the measuring bridge formed by the photoresistances of the FS and FSH and constant resistors I, and R an electrical signal is taken proportional to the change in the diameter of the thread and fed through the switch I or to the resistance serving as an input to the integrated DC amplifier assembled on (position of the switch /), or to the resistance Rn, and from there directly to the electronic recording potentiometer 5Я (position of the switch I).

In the first case, the electronic potentiometer is turned on to the output stage of the integrating amplifier, assembled according to the cathode follower circuit, and measures and records the averaged metric number of the monofilament. In the second case, the control and registration of the thread irregularity is performed.

The power of the measuring bridge circuit is produced from a rectifier stabilized by an L2 lamp. The lamp of the L illuminator is powered by an audio generator assembled on the lamp L. The anode circuits of the integrating amplifier and the generator are powered by the rectifier via an electronic voltage regulator assembled on the lamps L, L and L. .

The rewinding device is driven by an electric motor D.

The industrial usefulness of this proposal was confirmed by the Central Scientific Research Institute of the Silk Industry, according to which the proposed device, based on the reception of a reflection of the measured from the measured monofilament capturing on the luminous flux, is of interest and applicable to the control of a circular nylon monofilament having a length of the same light reflectance.

Subject invention

A device for checking thread irregularities, including a device for moving a thread, a filament illuminator with an optical system, and a photoresistance included in a measurement circuit, characterized in that, in order to determine the metric number of monofilament, for example, capron, by the amount of reflected light flux, the measuring accuracy is improved , it uses a different photoresistance with an optical system and an adjusting optical wedge, which is illuminated by the same illuminator, and both photoresistances are switched on by differential ntsialno the measuring wiring therein with electronic recording potentiometer at its output through switch emogo attached directly to the middle point E between the photoresistor when registering nerovnoty metric number of test monofilament or through an integrating amplifier for averaging values defined by the metric number.

387623f;

Fig