| 摘要 |
PURPOSE:To monitor paper jam and cut immediately after the start of printing by providing a device which sets a monitoring time for the upper limits of a reference pulse and that for the lower limits, monitors a sensor for detecting the presence of a sheet at a sheet folding part and detects no sheet supply. CONSTITUTION:Printing sheet is transport by a drive roller 3 and the rotation of a sensor roller 1 which transports a sheet with the drive roller 3 is monitored using a sensor 2 for transport speed. Then this monitor signal is measured using a pulse width measurement counter 5. The measurement results are entered in an upper limit pulse width comparison device 6 and a lower limit pulse width comparison device 7 separately. The comparison results are reported to a main control device 8 respectively. The main control device 8 controls a mechanical printing system 10 through a mechanical system control device 9, and further controls a sheet feed mechanism 12 through a sheet feed mechanism control device 11. The sheet feed mechanism 12 consists of a heater roll 14 and a sensor 13 to detect the presence of a sheet at a folding part in the downstream of the heater roll 14. The sensor 13 enters data on the folding part status obtained by a sensor monitoring device 15 for detecting the presence of a sheet at the folding part in a main control device 8. |
