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The passage of a transparent sheet or substrate through a light path is detected by the pivoting of an opaque shutter.
English (United States)
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The passage of a transparent sheet or substrate through a light path is
detected by the pivoting of an opaque shutter.
The light path 10 between the photocell and light source combination 11 and
12 normally detects passage of sheet 13 when it passes through the nips of
rollers 15 - 18 in the direction generally indicated by arrow 19 if sheet 13 is
opaque. However, if sheet 13 is a transparency, light beam 10 would not
normally be interrupted, and passage of sheet 13 would not be detected by the
Opaque shutter 20 is arranged by collars 21 and 22 to pivot on shaft 14 in
free rotation so that normal movement of shaft 14 does not cause shutter 20 to
move. Passage of a transparent substrate 13 pushes shutter 20 into a generally
horizontal position, as suggested by arrow 25, so that light path 10 is disrupted
as long as the transparency is passing through rollers 15 - 18. After the trailing
edge has left, shutter 20 drops back into the position shown, and the light path 10
is again completed.
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