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Browse Prior Art Database

Computer Controlled Copier Magnetic Brush Tester

IP.com Disclosure Number: IPCOM000045587D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Miller, GD: AUTHOR

Abstract

The flux density of a magnetic brush in a copier is critical to the operation of the developer in the copier. Shown above in Fig. 2 is a computer controlled test apparatus for testing the uniformity and location of the flux fields on a magnetic brush.

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Computer Controlled Copier Magnetic Brush Tester

The flux density of a magnetic brush in a copier is critical to the operation of the developer in the copier. Shown above in Fig. 2 is a computer controlled test apparatus for testing the uniformity and location of the flux fields on a magnetic brush.

Fig. 1 is a pictorial representation of a magnetic brush. The core 10 of the brush is mounted on a "D" shaft 12. The core is faceted so that magnet 14 may be attached tn the core. The core assembly is then placed inside a shell 16 to form the finished magnetic brush structure for use in a copier.

The automated test apparatus for testing the magnetic brush core is shown in Fig. 2. Core 10 containing magnets 14 is rotated by stepping motor 20. The computer or microprocessor 18 controls the angular position of core 10 under gauss probe 22. As the core 10 is rotated by motor 20, computer 18 samples the flux signal picked up by probe 22 via the analog circuits 24. When a maximum flux signal is detected, the computer stores the angular position of the core 10 as read from tachometer 26. Angular positions for core 10 are defined relative to the flat face of the D shaft 12.

Computer 18 is programmed to look for maximum peak flux signals at specific angular positions of the core 10. If the maximum flux or flux peak is not detected within an angular range of the specified angular position or if a f lux peak is not sufficiently high, the computer will indicate a bad core assembl...