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公开(公告)号：CA1181836A
公开(公告)日：1985-01-29
申请号：CA399186
申请日：1982-03-23
Applicant: IBM
Inventor： COLGLAZIER DONALD F , JANSSEN DONOVAN M , MANTEY JOHN P , VALENT JAMES A
Abstract: A sheet registration apparatus for positioning sheets in a registered position on a work surface such as the document platen of a convenience copier/ duplicator machine. The apparatus includes a bidirectional servo-controlled sheet transport for conveying the sheet over the work surface. A sheet sensing device is disposed within the path of sheet travel A controller monitors the sensing device and activates a position control routine following the occurrence of a predetermined level change in the signal generated by the sensing device. At the end of the position control routine, the transport is stopped thereby positioning the sheet in the registration zone. The apparatus enables sheet registration for a machine operating in a duplex and/or simplex mode. The apparatus further enables registration at any point on the document platen.
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公开(公告)号：CA2018497C
公开(公告)日：1995-06-27
申请号：CA2018497
申请日：1990-06-07
Applicant: IBM
Inventor： GODDARD JOAN S , OVERBY WAYNE A , VALENT JAMES A
Abstract: This is an electronic scheme for correcting mechanical misalignment and electrical delays from laser beam to laser beam in the scan direction of a multiple beam laser scanning system for use in an electrophotographic machine. The position at which a reference beam is turned on is sensed and adjusted to a desired position. Thereafter, the positions at which non-reference laser beams are turned on are sensed and adjusted to the desired position. In one embodiment, the energization of laser beams is posi? tioned at the trailing edge of the second element of a photodetector. In a second embodiment, the point of full laser energy is matched, beam to beam, at the junction of the same two elements in a CCD array. Programmable delay lines are used to obtain sub-pel resolution.
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