Optical sensing system for determining the orientation of weft t

Details Optical sensing system for determining the orientation of weft t Optical sensing system for determining the orientation of weft t

1984-10-19

1987-04-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356430, G01N 2186

Patent

active

046563601

ABSTRACT:
An optical sensing system that detects the angular orientation of weft threads in a moving web of a textile has a sensor array that receives light transmitted through the web from a light source. The sensor array is preferably a single monolithic chip that includes a radial pattern of photosensitive areas that each generate an electrical signal proportional to the total intensity of the light incident on the area. The areas are elongated and narrow so the moving shadow of a weft thread passing over the area will modulate the output signal. The modulation is strongest when the thread is generally aligned with the area. Electronic circuitry generates a DC signal associated with each area that is proportional both of the magnitude and frequency of the modulation of the signal. The circuitry also compares these signals, selects the largest one, and generates an analog output voltage characteristic of the area associated with the largest signal. The circuitry optionally further includes a feedback circuit responsive to the selected maximum signal which controls a variable power supply for the light source and a switched gain amplifier responsive to extremes of light source voltage level. The light source and the sensor array are arranged so as to provide a fixed angle of incidence of the light beam on the web. This fixed angle is set at between 15.degree. and 35.degree. and is preferably about 23.degree..

REFERENCES:
patent: 2106611 (1938-01-01), La Pierre
patent: 2106612 (1938-01-01), La Pierre et al.
patent: 2196893 (1940-04-01), Berry
patent: 2209220 (1940-07-01), Berry
patent: 2311406 (1943-02-01), Mansfield
patent: 2427753 (1947-09-01), Vose et al.
patent: 2492737 (1949-12-01), Dunn
patent: 2587224 (1952-02-01), Robertson
patent: 2623262 (1952-12-01), Berry
patent: 2638656 (1953-05-01), Tuttle et al.
patent: 2972794 (1961-02-01), Saul et al.
patent: 3077656 (1963-02-01), Mahlo
patent: 3169193 (1965-02-01), Strang
patent: 3192595 (1965-07-01), Morton et al.
patent: 3193688 (1965-07-01), Morton et al.
patent: 3350933 (1967-11-01), Smith
patent: 3517204 (1970-06-01), Mahlo et al.
patent: 3554656 (1971-01-01), Eicken
patent: 3633037 (1972-01-01), Langenbeck
patent: 3636598 (1972-01-01), Hannaway
patent: 3689772 (1972-09-01), George et al.
patent: 3729635 (1973-04-01), Shottenfeid et al.
patent: 3751774 (1973-08-01), Hannaway
patent: 3836254 (1974-09-01), Barringer
patent: 4248533 (1981-02-01), Shimada
patent: 4378161 (1983-03-01), Maddox
patent: 4414476 (1983-11-01), Maddox et al.
Mount Hope Machinery Co., "Instruction Manual 11908D890 B, Weftrol Models C&H, Dowed and skewed Weft Straightener with Electro Mechanical Automatic Controls Type TNP-4", (1975).
Mount Hope Division of SW industries, Inc., brochure for "Weftrol, Automatic Multiple Detector Bowed & Skewed Weft Straightener", (1976).

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