Apparatus for detecting the passage of multiple superposed sheet

Details Apparatus for detecting the passage of multiple superposed sheet Apparatus for detecting the passage of multiple superposed sheet

1988-09-16

1990-01-16

Ruggiero, Joseph

Boots, shoes, and leggings

209534, 271263, 364563, 902 16, G06F 1520, B65H 712

Patent

active

048947830

ABSTRACT:
A multiple sheet detection apparatus 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). Voltage generating means (42) produce an output voltage which varies linearly with movement of the axis of the second roller relative to the axis of the first roller (12). Data processing means sample this voltage a predetermined number of times 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 which are respectively representative of the sums of the voltages sampled during each such revolution. 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:
patent: 4154437 (1979-05-01), Butcheck et al.
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.
patent: 4815015 (1989-03-01), Milne
U.S. Serial No. 094,986, filed Sep. 10, 1987, assigned to NCR Corporation, entitled "Apparatus for Detecting the Passage of Multiple Superposed Sheets Along a Feed Path", Douglas L. Milne; Pat. No. 4,815,015.

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