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Browse Prior Art Database

Magnetic Brush Developer with Tandem Overrunning Wrapdown Clutch Assembly

IP.com Disclosure Number: IPCOM000089444D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 99K

Publishing Venue

IBM

Related People

Abbott, PE: AUTHOR [+2]

Abstract

Developer material is applied to a magnetic brush developing roll by a magnetic conveyor roll 17. The conveyor roll is clutched into and out of a common drive system, which is used to drive the magnetic brush roll 11, to thereby control the application of developer material to the magnetic brush roll.

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Magnetic Brush Developer with Tandem Overrunning Wrapdown Clutch Assembly

Developer material is applied to a magnetic brush developing roll by a magnetic conveyor roll 17. The conveyor roll is clutched into and out of a common drive system, which is used to drive the magnetic brush roll 11, to thereby control the application of developer material to the magnetic brush roll.

A continuously rotating magnetic brush roll 11 applies developer material to the rotating photoconductor drum 13 having an electrostatic image thereon. Developer material is conveyed to magnetic brush roll 11 from a sump 15 by rotating conveyor roll 17. Counterrotating augers 19 stir the developer mix, and dispenser roll 21 applies fresh toner to the developer mix.

Magnetic brush roll 11, conveyor roll 17, augers 19 and dispenser roll 21 are driven by a common drive chain 23. A tandem overrunning/ wrapdown clutch 25 couples the drive chain to conveyor roll 17. The conveyor roll is clutched on only during the time that electrostatic images on drum 13 are passing magnetic brush
11. During runout, startup, and drum incrementing cycles, the drive to conveyor roll 17 is uncoupled, thereby reducing developer material wear.

When conveyor roll 17 is turned off, developer material flow to magnetic brush roll 11 is halted. The clutching of conveyor roll 17 also reduces chain stretch, by reducing the starting torque required to start up the developer unit.

The use of a tandem overrunning/wrapdown spring clutch 25 allows the inertia load represented by conveyor roll 17 to be accelerated at a controlled rate.

Clutch 25 is shown in Fig. 2. When conveyor roll 17 is off, i.e., not rotating, a lever (not shown) ho...