Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1991-12-17
1993-10-12
Grimley, A. T.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
226 20, 250236, 250559, 250560, 346134, 355203, 355208, 355308, 355311, 355317, G03G 2100, G01D 942
Patent
active
052529916
ABSTRACT:
A system is described for providing positional information regarding a media sheet in an image forming apparatus. The system includes a laser for providing a beam of collimated light and a mechanism for moving a media sheet along an imprinting path. Beam sensors are placed in the imprinting path, and positioned so as to be partially shaded by a media sheet when it is moved along the imprinting path. A scanning system moves the light beam across the media sheet and past its edges to cause the beam to fall on the beam sensors, when the media sheet is partially shadowing the beam sensors. A processor is responsive to outputs from the beam sensors to determine positional information regarding the media sheet. Positional information is derived by determining the time during which the scanned beam is incident on a sensor.
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IBM Technical Disclosure Bulletin, vol. 20, No. 4, Sep. 1977, "Device for Feeding and Registering Paper", Bantz, D. F., Evangelisti, C. J., pp. 1623-1625.
Hirahara Edwin
Storlie Chris A.
Grimley A. T.
Hewlett--Packard Company
Smith Matthew S.
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