| 摘要 |
<p>METHOD AND APPARATUS FOR THE SYNCHRONIZATION OF A MOVEABLE MATERIAL WEB AND AN OPTICAL DEFLECTION PATH In a method for the synchronization of a material web particularly a photosensitive material web in a photo typesetting process, an optical path transversely to the direction of motion of the material web normally transportable with an approximately constant transport speed is deflected into deflection lines and if necessary scanned, or image-wisely exposed. The transport speed and the deflection speed are controllable by common clock pulses. At the beginning of each deflection line, a reference signal (SOL) for time and deflection position is generated. In order to retain, in case of an interruption of the scanning, the regular scanning structure of the scannings on the material web, the following steps are provided: In case of an interruption of the scanning, reference signals are generated while line-wise deflection of the optical path is continued. The material web beginning with a first selected reference signal after the interruption is slowed down by n clock pulses to standstill. Beginning with a subsequent reference signal, the material web is accelerated by n clock pulses to an identical return speed opposed to the transport speed. Subsequently it is reset by p clock pulses with the return speed up to a subsequent reference signal. Starting from the last-mentioned reference signal, the material web is slowed down by n clock pulses to standstill. After a variable interval up to a reference signal, the material web is accelerated by n clock pulses to the transport speed and subsequently, by p clock pulses up to a following reference signal, is passed with the transport speed into a scanning position which is equal to the scanning position with the first selected reference signal. Figure 3 refers.</p> |
