| 摘要 |
<p>Disclosed is a drive for a ribbon disc (20) for a printer (10), the printer (10) including a printwheel (12) mounted for rotation on the shaft (15) of a printwheel driver (16) and intermediate a print hammer (18) and print receiving means (40). The printwheel driver (16) is connected to the printwheel (12) for effecting rotation thereto to position predetermined petals (14) of the printwheel (12) opposite the hammer (18). A ribbon disc (20) is interposed intermediate the printwheel (12) and the print receiving means (40) and clutch means (31), in one embodiment, is connected to the shaft (15) for coupling and uncoupling the ribbon disc (20) to and from the printwheel driver (16) dependent upon the direction of rotation of the printwheel (12). In a second embodiment, wherein the printwheel is mounted in a protective cartridge (70), the ribbon disc (20) is also mounted in the cartridge (70) and the known biasing spring is modified slightly to form a clutch (75) to first inhibit the rotation of the ribbon disc (20) when the printwheel (12) rotates and allow the rotation of the ribbon disc (20) when the printwheel (12) rotates in the opposite direction.</p> |
