Increment-decrement logic for serial printer

Details Increment-decrement logic for serial printer Increment-decrement logic for serial printer

B - Operations, Transporting

41

J

354/236.131

B41J 1/24 (2006.01) B41J 7/48 (2006.01) B41J 25/00 (2006.01) G06K 15/06 (2006.01)

Patent

CA 1063518

ABSTRACT OF TEE DISCLOSURE A serial printer comprises a carriage, a print member rotatably mounted to the carriage and including a plurality of character elements, a drive coupled to the print member for rotating the print member to a desired rotational position, a device coupled to the print member for generating A plurality of periodic position signals each indicative of the rotational movement of the print member, and a device for storing a count indicative of the actual rotational position of the print member, the device for storing in- cluding a device responsive to an increment pulse for increment- ing the count by one and a device responsive to a decrement pulse for decrementing the count by one. An increment- decrement circuit is coupled to the device for generating and is responsive to the position signals for generating an increment pulse at a predetermined point during the period of a predetermined one of the position signals during rotation of the print member in one direction, and a decrement pulse at said predetermined point during rotation of the print member in the opposite direction. The increment-decrement circuit includes a device for inhibiting the generation of a pre- determined increment pulse that would normally occur when the print member has been rotated too far and overshoots the desired rotational position by a predetermined amount and then is returned to the desired rotational position. The printer further includes a device responsive to the count and to a signal representative of the desired rotational position of the print member for controlling the direction and speed of rotation of the print member.

276480

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