BUFFERED OUTPUT FOR TWO PASS - TWO COLOR PRINTING MACHINES
Original Publication Date: 1994-Apr-30
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
Two pass - two color or highlight color printing machine 5 shown in Figure 1 is inefficient when operating in two color mode, since a number of skipped or unproductive pitches can occur when operating in this mode. In two color mode, a sheet cycles back to transfer area 6 after a first color (or black) image is transferred to the sheet. During the time it takes to cycle a sheet back, which is on the order of three pitches, printing machine 5 cannot be imaging other black only copies. For example, given a print job sequence where three sheets require, black only, black plus color and black only: the first sheet is imaged and sent to output tray 19; the second sheet is imaged in black and then sent back to transfer station 6 for highlight color imaging; and the third sheet is not imaged until the second sheet has completed. Thus, given return path 7 is three pitches long (i.e. capable of holding three sheets), a total of seven pitches would be required to transfer four images on three sheets.