Air density adaptive vacuum controller

Details Air density adaptive vacuum controller Air density adaptive vacuum controller

1984-07-18

1987-05-05

Schacher, Richard A.

Sheet feeding or delivering

Feeding

Separators

271 98, 271105, 271108, 271196, 271276, B65H 312

Patent

active

046626220

ABSTRACT:
A vacuum media capturing and retention system for a drum type printer or recorder is disclosed. The apparatus includes a vacuum drum with two regions of vacuum passages, one for capturing the leading edge of the media and the second for retaining the trailing edge of the media. When the leading edge of the media is initially captured the vacuum level in the drum is at one level. After the leading edge of the media is captured the vacuum level is dropped to a lower level until the trailing edge of the media is captured. Following the capture of the media trailing edge, the vacuum level within the drum is again increased to retain the media thereto during the copying or recording operation of the overall device.

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patent: 4369964 (1983-01-01), Jinnai et al.
patent: 4385229 (1983-05-01), Middleditch
patent: 4397459 (1983-08-01), Silverberg et al.
patent: 4437659 (1984-03-01), Caron et al.
patent: 4513957 (1985-04-01), Schaefer, Jr.

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