| 摘要 |
An optoelectronic device for checking the number of cigarettes making up an orderly group of cigarettes to be packed, and/or the regularity of the cigarette ends, includes a box-like cigarette-checking head (1) in which a number of feeler pins (2) are axially slidably mounted, the said feeler pins (2) being pressed against the cigarette ends, and controlling a number of intercepting screens (4) located between light sources (10), such as light emitting diodes, and photosensitive elements (11), such as phototransistors. Air under pressure is fed into the box-like cigarette-checking head (1), and is caused to first sweep the light sources (10) and the photosensitive elements (11). Thus, dust is prevented from settling down on the light sources (10) and on the photosensitive elements (11), and the air under pressure flowing out of the box-like cigarette-checking head (1) through the feeler pin-guiding bores (3, 8), will remove any dust from said bores and guarantee the slidability of the feeler pins (2).
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