| 摘要 |
Disclosed is a carriage driving device in which a rack 8 with high rigidity and gear teeth 8a at one side elongated therethrough is fixed on a bottom frame 7c in a frame 7 of a printer 1 so that the rack 8 is arranged parallel with a platen 5, and both a pinion 16 meshed with the gear teeth 8a of the rack 8 and a driving motor 15 for rotating the pinion 16 are arranged on a plate 18 which is rotatably supported around a support shaft 17 in a horizontal direction on the carriage 2. The pinion 16 is biased by a spring 22 so as to constantly mesh with the gear teeth 8a of the rack 8. In the carriage 2, a first contact member 10 slidably contacting on the upper surface of the rack 8 and a second contact member 11 slidably contacting to the side of the rack 8 opposite to the side where the gear teeth 8a are formed, are arranged so that a predetermined positional relationship of the carriage 2 against the platen 5 is maintained. Thereby, the rack 8 concludes to have two functions for guiding the carriage 2 reciprocally along the platen 5 and for maintaining the predetermined positional relationship between the carriage 2 and the platen 5, in addition to a function for driving the carriage 2 in cooperation with the driving motor 15.
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