| 摘要 |
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.
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