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DOCUMENT DRUM

IP.com Disclosure Number: IPCOM000024633D
Original Publication Date: 1981-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 64K

Publishing Venue

Xerox Disclosure Journal

Abstract

With slit exposure type xerographic reproduction machines, it may be desirable to retain the document to be copied on a vacuum drum and rotate the drum past the exposure slit to expose the xerographic drum. With any type of vacuum document handler, the vacuum holes may "print" and show up on the final copy. This occurs either by the holes being optically visible through the translucent document or around the outside of the document when the document is smaller than the vacuum belt or drum.

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XEROX DISCLOSURE JOURNAL

DOCUMENT DRUM Proposed Gerald M. Garavuso Classification

US. CI. 355/76 Int. C1. G03b 27/62

FIG. 2

FIG. 3

Volume 6 Number 3 May/June 1981 145

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DOCUMENT DRUM (Contld)

With slit exposure type xerographic reproduction machines, it may be desirable to retain the document to be copied on a vacuum drum and rotate the drum past the exposure slit to expose the xerographic drum. With any type of vacuum document handler, the vacuum holes may "print" and show up on the final copy. This occurs either by the holes being optically visible through the translucent document or around the outside of the document when the document is smaller than the vacuum belt or drum.

By providing a vacuum drum having a plurality of grooves similar to the groove 2 illustrated in Figure 1 with a perforated belt (cover) 4 having openings 6 therein as seen in the cross sectional view of Figure 2 and the axial view of Figure 3, it can be seen in Figure 3 that light rays are reflected such that the holes are not "seen" in the reflected light rays. Thus, print through of the vacuum openings is avoided.

146 XEROX DISCLOSURE JOURNAL

Volume 6 Number 3 May/June 1981

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