Browse Prior Art Database

Vacuum Transport Drum

IP.com Disclosure Number: IPCOM000086652D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Glowa, RM: AUTHOR [+5]

Abstract

The adherence of sheets to a transport drum is improved by providing, in addition to leading and trailing-edge vacuum ports, circumferential grooves in the drum surface which are evacuated by the leading-edge vacuum ports.

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Vacuum Transport Drum

The adherence of sheets to a transport drum is improved by providing, in addition to leading and trailing-edge vacuum ports, circumferential grooves in the drum surface which are evacuated by the leading-edge vacuum ports.

Referring to Fig. 1, a rotatable transport drum 1 evacuated through hollow shaft 2 has a plurality of transverse grooves 3 for attaching the leading edge and a second plurality of grooves 4 for attaching the trailing edge o f a sheet wrapped onto the drum. In addition, a plurality of circumferential grooves 6 are formed in the drum surface which are each connected at one end to one or more of the transverse leading-edge grooves 3. Vacuum is supplied to grooves 3 and 4 by ports 7 through the drum wall to the evacuated interior. Grooves 6 do not have their own ports.

As a sheet is picked up by grooves 3, it covers those grooves and begins to wrap over circumferential grooves 6 in a progressive manner. As the sheet covers the circumferential grooves, vacuum continues to attract an unattached sheet portion to accomplish advancing adherence of the sheet to the drum surface. Finally, the trailing edge of the sheet is attracted by transverse grooves
4. The provision of grooves to progressively adhere the sheet to the drum surface precludes a loose wrap of the sheet on the drum surface.

A further advantage is that the vacuum source requires only moderate capacity, since fewer ports are necessary in the drum wall. Figs. 2 and 3 ill...