| 摘要 |
PURPOSE:To securely control the feed amount of roll paper while suppressing the shock at starting by means of a small-sized motor by detecting a paper sprocket hole on the winding shaft side and the supplying shaft side, comparing the amount of paper feed with the paper feed drum side, and controlling the winding shaft and the supplying shaft. CONSTITUTION:A paper feed drum 1 is connected to a feed amount detecting plate 14 by a coupler 13. The rotation of the detecting plate 14 is detected by a detector 15, and a pulse corresponding to the amount of paper feed, i.e., signals 17, 18 are outputted. The output signal 17 is added to a signal 19 outputted by a sprocket hole detector 16 on the winding shaft 2 side, and inputted to the input terminal UP of a counter 21. Similarly, an output signal 18 from a detector 15 is added to a signal 20 from a detector 16, and inputted to an input terminal DN. The output from a counter 21 is inputted to a digital-to-analog converter 22 as the complement of 2, and outputted to a switch 23. The switch 23 is provided for switching a signal (a) and a signal (b) from an initializing logic 25, and a selected signal is inputted to a voltage to current converter 24, allowing a winding motor 4 to be turned in the forward and backward directions by said signal. |
