Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1996-06-14
1999-05-04
Le, Que
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
25055947, 377 15, G01N 2186
Patent
active
059006390
ABSTRACT:
The present invention relates to an apparatus for detecting the presence of a record medium (31) in a feed path (22) and for sensing the speed of the record medium (31) as it passes along the feed path (22). The invention includes roller means (28) movable between a first position when the record medium (31) is not present in the feed path (22) and a second position when the record medium (31) is passing along the feed path (22). The roller means (28) are arranged to be rotated by virtue of engagement with the record medium (31) when in the second position. Sensing means (24) operative to provide an indication of the absence of the record medium (31) when the roller means (28) is in the first position are also provided along with pulse generating means (40,45) arranged to generate a series of pulses in response to rotation of the roller means (28). The invention further includes an electronic control means (48) responsive to the pulses generated by the pulse generating means (40,45) and arranged to make a determination of the speed of the record medium (31) as it passes along the feed path (22).
REFERENCES:
patent: 5291225 (1994-03-01), Saito
Le Que
NCR Corporation
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