Epson TM U200D Technical Reference - Page 44

TM-U200D/U200PD Technical Manual Print head unit movement When the Motor, carriage is driven and the Gear, carriage motor is moved in the direction of arrow B (forward rotation), the rotational power is conveyed to the Pulley, belt drive, then the belt. Next the Carriage sub-ass'y, which is fixed to the belt, is moved in the direction of arrow B. When the Gear, carriage motor is rotated in the direction of arrow A (reverse rotation), the Carriage sub-ass'y is moved in the direction of arrow A. Belt Gear, carriage motor Pulley, belt drive B A A B AB AB Carriage sub-ass'y Figure 2-3 Print head unit movement Wire movement when a single dot is printed When the specified print head drive pulse is input to the drive coil, the iron core is magnetized, and the actuating plate is pulled in the direction of arrow A. This action pushes the wire toward the platen. When the wire strikes the ink ribbon and paper against the platen(*), a single dot is printed. When the energizing of the drive coil is completed, the wire and actuating plate are returned to the standby position by the wire return spring and actuating plate spring. (*) The "platen" is the portion of the Frame, paper feed being struck by the wires during printing. Actuating plate Wire return spring Ink ribbon B Paper roll Wire A Wire guide Iron core Platen Drive coil Figure 2-4 Printing Rev. B Mechanism Configuration and Operating Principles