Monitoring sheet length

Details Monitoring sheet length Monitoring sheet length

1986-06-12

1989-07-18

Lall, Parshotam S.

Boots, shoes, and leggings

364471, 271258, 271261, 377 8, 340673, G06F 1546, B65H 4308

Patent

active

048499153

ABSTRACT:
Apparatus which carries out a method for monitoring the length of sheets (such as banknotes) passing a predetermined position includes two pairs of rollers 1, 2 defining respective nips 5, 6 through which a sheet passes. The passage of a sheet causes radial movement of portions 11 of the rollers 2 which is detected by detectors 12 mounted in a shaft 4. The passage of a sheet causes respective counters 15, 16 to be incremented at a relatively fast sheet. The length of the sheet is determined by monitoring the counter, counters 15 and 16, during the plurality of successive intervals. The leading edge of the sheet appears during the first of the successive intervals and the trailing edge of the sheet appears during the last of the successive intervals. The total length of the sheet is determined by counting the total number of intervals between the first and last interval and counting a portion of the first and last intervals, respectively, determined by the ratio of the counter in the first and last intervals and immediately following and preceding intervals, respectively.

REFERENCES:
patent: 4179685 (1979-12-01), O'Maley
patent: 4275879 (1981-06-01), Yamashita et al.
patent: 4504916 (1985-03-01), Oka
patent: 4653008 (1987-03-01), Kai et al.

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