The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 1989
Filed:
Mar. 10, 1988
Applicant:
Inventor:
Fiorenzo Ghiardo, Vigliano Biellese, IT;
Assignee:
ROJ Electrotex S.P.A., Biella, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D03D / ; G01N / ;
U.S. Cl.
CPC ...
139452 ; 242 4701 ; 242 4712 ; 356429 ;
Abstract
A weft feeding device for weaving looms regulates the motor speed, according to the amount of yarn wound on the drum at least two photoelectric cells (11, 12) are provided one of which (11) checks the amount of yarn (3) wound on the drum (1), while the other (12) measures the transparency of the protection glass (15) provided on the cells. These photoelectric cells (11, 12) cooperate with an electronic circuit, which processes their signals (31, 32) in order to automatically compensate the transparency variations in the protection glass (15), thereby allowing a more uniform regulation of the motor speed of the weft feeding device.