Advancing material of indeterminate length – Means to engage longitudinally spaced modifications in material – Pins on flexible belt or chain
Patent
1993-06-10
1995-12-12
Stodola, Daniel P.
Advancing material of indeterminate length
Means to engage longitudinally spaced modifications in material
Pins on flexible belt or chain
B65H 2020, B41J 1130
Patent
active
054742200
ABSTRACT:
A sheet feed mechanism including a first tractor slidably mounted onto a drive shaft and a guide shaft respectively disposed between a first and a second frame of the printer. A wire is passed through the first tractor and is stretched between the first and second frames by the use of a tension spring or another energizing device connected to one end of the wire adjacent the first frame. Both the first tractor and the second tractor have pin belts with a plurality of pins disposed thereon for aligning and meshing with the holes in the sides of successive sheets of paper. Furthermore, the first tractor includes a fixing assembly for fixing the first tractor to the wire, and also including a loosening assembly which, essentially simultaneously when or after the first tractor is fixed to the wire, produces a loosened portion in the wire at a position thereof intermediate the fixing assembly and the second frame that would permit the first tractor to slide on the drive and guide shaft to compensate for any increase or decrease in the width of a successive sheet of paper due to a change in temperature, humidity or the like.
REFERENCES:
patent: 3825202 (1974-07-01), Robinson
patent: 4189078 (1980-02-01), Spisz
patent: 4389007 (1983-06-01), Seitz
patent: 4533074 (1985-08-01), van Thiel
patent: 4546908 (1985-10-01), Cassese et al.
patent: 4550623 (1985-11-01), Gysling
patent: 5163593 (1992-11-01), Yamashiti
Dunn Eileen A.
Seiko Epson Corporation
Stodola Daniel P.
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