A SWITCHABLE BAFFLE TO ENABLE DUAL PITCH XEROGRAPHIC COPYING
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
In an electrophotographic printing machine, the photoconductive member is fre-quently a flexible belt. The size of the belt determines the number of latent images that can be recorded thereon. Thus, a four-pitch machine is capable of recording four latent images thereon, whereas a five-pitch machine is capable of recording five latent images thereon. It is highly desirable to be capable of switching from a four-pitch mode to a five-pitch mode of operation. Typically, a four-pitch mode of operation corresponds to an original document of 257 milli-meters whereas a five-pitch mode corresponds to a document of 216 millimeters. Thus, the printing machine switches back and forth between the four-pitch mode and the five-pitch mode. In order to create two "windows" on the photoreceptor, a light baffle is moved from a spring loaded rest position by actuating a solenoid. The solenoid signal is generated by the machine logic when the operator selects the mode. Alternatively, a sensor in the copy sheet tray providing a signal indicative of the size of the copy sheet, may be employed to generate a suitable signal for actuating the solenoid. The solenoid drives a baffle that will provide a proper image framing at the photoreceptor plane. It will switch position automatically as the machine changes from a four-pitch mode to a five-pitch mode.