| 摘要 |
<p>An LED/photodetector structure (54, 34) is disclosed positioned to cooperate with a daisy wheel print element (10) of a daisy wheel printer and a light interrupter (40) such that under microprocessor control, a stepping motor will rotate and home the daisy wheel print element (10), sense the escapement pitch corresponding to that element (10), sense the font weight or impact force level associated with that print element (10) and then cause the carrier to be translated to the left frame, thereby engaging the light beam interrupter (40) 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.</p><p>The print element has apertures (20, 24, 26, 28, 30) formed in the hub (22) thereof which are all specialty positioned within one semicircular portion of the print element hub (22) and which denote the home position of the print element (10) -and coded values representing escapement pitch and impact level for that print element</p> |
