Browse Prior Art Database

Document Glass Clearing Copier Start-Up Process

IP.com Disclosure Number: IPCOM000046003D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Brannan, RC: AUTHOR [+2]

Abstract

A copier protects against originals left on a document glass by a previous user by always running the exit mechanism at start-up to flush out any originals.

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Document Glass Clearing Copier Start-Up Process

A copier protects against originals left on a document glass by a previous user by always running the exit mechanism at start-up to flush out any originals.

Figs. 1 and 2 show side and top views of a typical document feeder 10 for a copier 11. The device includes document propelling belts or the like in cover 13, a registry/exit gate l4 and a reference edge 16 as well as exit sensor 17. Entry tray 20 has a preentry sensor 2l and entry sensor 22 associated with entry gate
25.

When an original 15 is left on the glass l2, the next user's first original 16 either jams at the entry tray 20 or rides over the one already there. If the latter occurs and the machine starts, copies of the wrong original are made and possibly damaged.

Here, protection is achieved by assuming that there is an original on glass 12 any time an entry is attempted. In the Fig. 3 flow diagram, the exit and entry gates 14 and 25 are opened simultaneously, and the transport belt is activated after a document is detected by the entry sensor 22. As the entering document 16 is moved onto the scan area, any original 15 on the glass at this time will automatically exit without affecting throughput. If a document does exit, its progress is monitored until it leaves the exit sensor 17. However, if after a preset period (for example, 150 milliseconds) an exiting document is not sensed (i.e., a document was never there to begin with), the exit gate 14 is close...