Advancing material of indeterminate length – By orbitally traveling material-engaging surface – Comprising rotary pinch pair
Patent
1981-08-12
1984-01-17
Levy, Stuart S.
Advancing material of indeterminate length
By orbitally traveling material-engaging surface
Comprising rotary pinch pair
226 29, B65H 2318, B65H 1722
Patent
active
044260300
ABSTRACT:
An apparatus for feeding at a high speed a tape having a series of the same patterns and check marks printed thereon. The tape is to be divided into sections each bearing one printed pattern. The feeding apparatus comprises a pair of first and second cylindrical drums rotatable in tangential contact so as to pull the tape out of its roll by frictionally driving the tape therebetween. The first drum is mounted for free rotation on a first drive shaft and has a circumference slightly longer than the predetermined design length of one section cut from the tape. The second drum is mounted for free rotation on a second drive shaft and has a circumference slightly shorter than the predetermined length of one section. An electromagnetic clutch is provided between the first drum and the first drive shaft while a unidirectional clutch is provided between the second drum and the second drive shaft. The electromagnetic clutch is brought into and out of transmission engagement under the control of photoelectric means for detecting two successive check marks on the tape. The unidirectional clutch normally transmits the driving force from the second drive shaft to the second drum, but allows the second drum to be rotated with the first drum in frictional contact with the second drum and rotating at a higher circumferential speed. In addition, an electromagnetic brake is provided between the second drum and the second drive shaft and is operable to keep the second drum and the second drive shaft in a relative restrained relationship at the same time as the electromagnetic clutch is de-energized.
REFERENCES:
patent: 2119670 (1938-06-01), Fitzgerald
patent: 2249190 (1941-07-01), Thompson
patent: 2576529 (1951-11-01), McKenney
patent: 2768827 (1956-10-01), Noble
patent: 3028064 (1962-04-01), Thyrlings
patent: 3949949 (1976-04-01), Thompson
patent: 4129238 (1978-12-01), Herd
Doigan Lloyd D.
Levy Stuart S.
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