Scanning carriage drive and image timing

Details Scanning carriage drive and image timing Scanning carriage drive and image timing

1991-05-20

1993-11-23

Woodiel, Donald O.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358472, 358497, H04N 1024, H04N 104

Patent

active

052649490

ABSTRACT:
A scanner has a frame assembly containing a carriage movably mounted in the frame assembly for scanning movement in a scanning path in a first direction along the length of the frame assembly, which includes at least one sheet transport path and a roll to index a sheet through the path in a direction transverse to the first direction. The scanning carriage is driven in the scanning path by a lead screw rotatably engaged with the scanning carriage for scanning movement along the length of the lead screw and a reversible motor. In a preferred embodiment the scanning carriage supports a reading head and/or a printing head for reading an image on a document and printing an image on a copy sheet and the pitch of the threads of the lead screw are selected so than an integer multiple of steps of a stepper motor provides a linear displacement of the carriage of one pixel width and a clock pulse generator simultaneously drives the stepper motor and the reading and/or printing heads.

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