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An Electrographic Printer with Asynchronous Image Belt

IP.com Disclosure Number: IPCOM000092984D
Original Publication Date: 1967-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Hider, TM: AUTHOR [+2]

Abstract

When a continuous, endless belt on which an electrostatic image is formed is used in an electrographic printer, it is necessary to control the belt so that the electrostatic image is not formed over the splice or joint of the two ends. This is accomplished by a mark detector device. The endless belt is divided up into a plurality of frames. None of the frames include the splice or joint of the two ends of the belt, this joint being in between two frames of the belt. At the start of each frame, a mark is provided on the belt to trigger a stop circuit. These marks are sensed by a detector which stops the belt for the formation of the electrostatic image.

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An Electrographic Printer with Asynchronous Image Belt

When a continuous, endless belt on which an electrostatic image is formed is used in an electrographic printer, it is necessary to control the belt so that the electrostatic image is not formed over the splice or joint of the two ends. This is accomplished by a mark detector device. The endless belt is divided up into a plurality of frames. None of the frames include the splice or joint of the two ends of the belt, this joint being in between two frames of the belt.

At the start of each frame, a mark is provided on the belt to trigger a stop circuit. These marks are sensed by a detector which stops the belt for the formation of the electrostatic image.

This xerographic type apparatus employs endless belt 1. Charging unit 2 uniformly, electrostatically charges the surface of belt 1. Immediately following unit 2 is mark detector 3. The latter controls circuitry for stopping the belt for exposure. After exposure, the formed electrostatic image is developed at developer station 4. The developed image is transferred to paper 5 at transfer station 6. The image on paper 5 is fused at station 7 and deposited in stacker 8. Finally, belt 1 is cleaned by cleaning unit 9 to complete the cycle of this frame.

By employing the mark detector, belt 1 can be frictionally driven with a pulley system and an indexing system is not necessary. Yet, the splice or joint of the two ends or any other nonprinting area cannot creep into...