| 摘要 |
Paper feed mechanism of a printer is disclosed for exactly transmitting rotative force of a drive shaft which interlocks a drive mechanism to a sprocket wheel which is provided for feeding a printing paper without play, and for locating and detaining the sprocket wheel at a desired position by an easy operation. The above-said mechanism comprises a disc which is fixed to the sprocket wheel, a detaining knob which has a shaft hole for inserting the drive shaft and fitted rotatably to the disc via a pair of snap shafts, a C-shaped spring, one end of which is fixed to the disc, the other end to the detaining knob, for turning each of them conversely. By these provisions, the inner circumference of the shaft hole which is provided at the center of the detaining knob comes into close contact with the drive shaft by the spreading force of the above-said C-shaped spring, therefore, the play between the shaft hole and the drive shaft is excluded to feed the printing paper exactly by the sprocket wheel and an improved printing quality can be obtained. Further to that, the sprocket wheel can easily be detained at desired position by turning the detaining knob against the force of the C-shaped spring. |
