Printwheel homing apparatus

Details Printwheel homing apparatus Printwheel homing apparatus

G - Physics

06

F

354/236.14

G06F 3/12 (2006.01) B41J 1/24 (2006.01) B41J 7/96 (2006.01) B41J 19/20 (2006.01)

Patent

CA 1155962

PRINTWHEEL HOMING APPARATUS Abstract of the Disclosure In a printwheel type of printer using a selection stepper motor for driving the printwheel, means are provided for performing printwheel homing operation upon occurrence of predetermined events. Such an event, is detected and reported to microprocessor means which drive motion means for bringing the printer carriage assembly to a first extreme left position where a stop element fixed relative to the printwheel rotation is made to enter the path of another stop element attached to rotate with the printwheel. Subsequently, the selection stepper motor driving the printwheel is driven for a number of steps at least equal to one motor revolution to ensure reaching inhibition of the printwheel rotation by bringing the rotating stop element into contact with the relatively fixed stop element. The carriage is then moved back to the left margin writing position where the relatively fixed stop element is withdrawn from the path of the other stop element and the angular printwheel home position is noted and stored by the microprocessor means. LE9-79-004

366018

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