| 摘要 |
<p>A printing unit comprises a main housing (1) with an upwardly extending handle (2) in which are mounted the control circuit panels (4, 5) for controlling an ink jet printer (3) in accordance with signals fed through a supply cable (6) from a computerised keyboard unit. As the housing (1) is drawn across a sheet of paper, a toothed belt (8) drives wheels (9 and 10), thus causing rotation of a disc (11). This disc incorporates slots and passage of the slots past a lamp (13) is sensed by a collector (14) aligned with the lamp (13), and signals indicative of the extent of movement of the printer over the sheet are sent to the control circuit (4). This control circuit determines the operation of the ink jet printer (3) at suitable instances to create a line of predetermined characters onto the sheet.</p> |
