| 摘要 |
In a multi-color changing apparatus of a small-sized printer, a ribbon color of the printer can be changed by a novel structure highly suitable as a ribbon-cartridge converting apparatus for two colors not for four colors because of its simple structure to enhance productivity and lower manufacturing cost without a high-priced stepping motor. The apparatus includes a pair of side frames in right and left installed with parts for forming the small-sized printer while having supporting plates pair projecting to rear corners, a cartridge frame connected to be rotatable about a pin by inserting extending plates at the rear sides into the supporting plates while having a c-shaped cam guider extending to one side thereof, a driven shaft installed to the side frames while having a lead screw for transferring a print head and an externally-expanding one end, a shift cam placed into the inside of the cam guider of the cartridge frame by being fitted to run idling at the edge end of the driven shaft, a shift ratchet fixedly attached to the driven shaft onto the immediate inside of the shift cam while having hooking jaws onto the outer periphery thereof, a clutch spring inserted between the shift cam and shift ratchet while having both edge ends respectively fixed to the shift cam and shift ratchet, and a solenoid fixed to the side frames for catching an operating end to the hooking jaws of the shift ratchet. Here, the shift ratchet, clutch spring and shift cam are rotated along with the rotation of the driven shaft by a frictional force to swing up and down the cartridge frame by the shift cam.
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