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IP.com Disclosure Number: IPCOM000024889D
Original Publication Date: 1982-Aug-31
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


In an electrophotographic printing machine, an edge erase shutter exposes the photoconductive surface outside the image area to inhibit development in this region. The shutter is coupled directly to the copy sheet tray and adjusts the size of the image zone to correspond to the copy sheet size. As shown in Figure 1, one embodiment of the apparatus comprises a shutter assembly 10 and a plunger assembly 12. The shutter assembly comprises a housing assembly 14 which contains a shutter 16 and a spring 18. The spring will bias the shutter against the plunger of the plunger assembly. The shutter assembly mounts in the photorecept module with the plunger assembly being mounted to the machine in line with the shutter. As shown in Figure 2, the plunger assembly comprises a plunger 20, a spring 22 and a housing assembly 24. The spring is placed between the housing and the plunger to maintain a cable 26 taunt under all circumstances. The cable is attached to the plunger so that it moves in the same direction and distance as the copy sheet input guide. In this way, the shutter is continuously positioned to the proper location.