公开(公告)号：DE3468368D1

公开(公告)日：1988-02-11

申请号：DE3468368

申请日：1984-08-10

Applicant: IBM

Inventor： BOBART KEVIN LEE ,  SAMSON ROBERT SAUL ,  SHAKIB IRAJ DAVID

IPC: B41J1/30 ,  B41J1/24 ,  B41J7/00 ,  B41J7/96 ,  B41J9/48

Abstract: An LED/photodetector structure is disclosed positioned to cooperate with a daisy wheel print element of a daisy wheel printer and a light interrupter such that under microprocessor control, a stepping motor will rotate and home the daisy wheel print element, sense the escapement pitch corresponding to that element, sense the font weight or impact force level associated with that print element and then cause the carrier to be translated to the left frame, thereby engaging the light beam interrupter with the left frame and forcing it into the light beam indicating the presence or the carrier at a known spacial position for homing of the carrier position. The data carried by the print element in the form of apertures formed in the hub thereof and are all spacially positioned within one semicircular portion of the print element hub.