Nipping device of a transfer unit

Details Nipping device of a transfer unit Nipping device of a transfer unit

1991-11-19

1993-03-23

Schacher, Richard A.

Sheet feeding or delivering

Feeding

By means to convey sheet

271 82, B65H 512

Patent

active

051957400

ABSTRACT:
A nipping device is provided in a transfer unit having a fixed support and rotating element rotatably supported by the fixed support. The nipping device retains a printing sheet against the circumferential surface of the rotating element, and separates the printing sheet from the transfer unit. The nipping device includes a nipper, a pivoting lever device and a drive device. The nipper is disposed pivotally on the circumferential surface of the rotating element, and retains the feed-leading edge of the printing sheet. The levers of the pivoting lever device are disposed within the rotating element, pivotal on an axes intersecting the circumferential surface of the transfer unit, and functions therein to open and close the nipper by which the printing sheet is nipped against and separated from the transfer unit. The drive device is disposed in the fixed support, and functions to turn the pivoting levers. Due to the structure of this device, it is possible to impel the pivoting levers in a uniform direction by the use of tension springs, and furthermore the setting of the impelling force of the springs to the minimum necessary, is facilitated, such that the load applied to the driving system of the transfer unit can be reduced.

REFERENCES:
patent: 2593148 (1952-04-01), Huck
patent: 2797097 (1957-06-01), Stobb
patent: 3221652 (1965-12-01), Mestre
patent: 3729187 (1973-04-01), Waibel
Patent Abstracts of Japan, vol. 12, No. 195 (M-705)(3042), Jun. 7, 1988 and JP-A-63 001 657 (Canon Inc.) Jan. 6, 1988.

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