Vaccum drum for different sized media

Details Vaccum drum for different sized media Vaccum drum for different sized media

1991-04-25

1993-02-02

Bollinger, David H.

Sheet feeding or delivering

Feeding

By means to convey sheet

271196, B65H 502

Patent

active

051832526

ABSTRACT:
A vacuum drum for securing and retaining different sizes of flexible sheet media has cylindrical surface holes connection different sets of longitudinal bores connected to right and left end radial bore distribution rings. The rings are adapted to be selectively separately connected to external sources of vacuum to provide first and second evacuation zones on the drum surface. A preferred embodiment has left and right shaft section ports connected so that application of a vacuum source to the left port evacuates a first drum zone for holding a smaller sized media, and connection of both left and right ports to a vacuum source evacuates both first and second drum zones for holding a larger media.

REFERENCES:
patent: 2753181 (1956-07-01), Ananader
patent: 4056057 (1977-11-01), Smith
patent: 4145040 (1979-03-01), Huber
patent: 4202542 (1980-05-01), Lammers et al.
patent: 4660825 (1987-04-01), Umezawa

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