| 摘要 |
PURPOSE:To prevent a trouble from being generated when an operator forgets to perform a setting operation, by detecting the thickness of a paper and automatically adjusting the gap between a printing head and a platen. CONSTITUTION:In setting printing paper, the paper is passed through a paper thickness sensor 5, whereby a voltage corresponding to the thickness of the paper is generated, the voltage is inputted to an amplifier 6, and an output from the amplifier is inputted to an A-D converter 7. A microcomputer 8 takes three samples of digital value of the paper thickness, and takes as average of the three values to determine the paper thickness. Next, prestored stepping motor driving information corresponding to the paper thickness is read, and is sent to a stepping motor 9 as a driving pulse. The stepping motor 9 thus supplied with the driving pulse generates a torque, which is transmitted to a cam 3 to drive a base for a printing head 1. By this, the position of the printing head, namely, the gap between the printing head and a platen is adjusted to an appropiate value, so that to trouble is generated when an operator forgets to set an adjusting lever. |
