Boots – shoes – and leggings
Patent
1987-09-10
1989-03-21
MacDonald, Allen
Boots, shoes, and leggings
902 17, G01B 700, G01D 300
Patent
active
048150150
ABSTRACT:
An apparatus for detecting the passage of superposed sheets along a feed path includes first and second cooperating rollers (12, 14), the second roller (14) being movable away from the first roller (12) in response to the passage of a single or multiple sheet between the rollers (12, 14). The first roller (12) has a diameter twice that of the second roller (14). Voltage generating means (42) produces an output voltage which varies linearly with movement of the axis of the second roller relative to the axis of the first roller (12). This voltage is integrated over one complete revolution of the first roller (12) first with no sheet present and then with a single or multiple sheet passing between the rollers (12, 14) to produce first and second values respectively. The first value is subtracted from the second value to produce a third value on the basis of which the number of sheets corresponding to the second value is determined.
REFERENCES:
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patent: 4159782 (1979-07-01), Swartzendruber
patent: 4168058 (1979-09-01), Granzow et al.
patent: 4398711 (1983-08-01), Horst et al.
patent: 4426785 (1984-01-01), Loftus et al.
patent: 4462587 (1984-07-01), Graef et al.
patent: 4491929 (1985-01-01), Ikoma et al.
Hawk Jr. Wilbert
MacDonald Allen
NCR Corporation
Sessler Jr. Albert L.
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