UN APARATO PARA USARSE EN UNA SITUACION EN DONDE UNA BANDA ES ALIMENTADA EN SU PROPIO SENTIDO LONGITUDINAL POR UN PAR DE RUEDAS CATALINA ACCIONADORAS.

摘要

In a machine, such as a plotter or sign maker, wherein the web is fed longitudinally of itself by a pair of feed sprockets two corresponding pins of the two sprockets are visually distinguished from the other pins and at intervals along the length of the web corresponding holes on opposite sides of the web are visually distinguished from the other holes to enable a pair of such distinguished web holes to be loaded onto the pair of distinguished sprocket pins, thereby assuring proper loading of the web onto the machine and eliminating the possibility of subsequent faulty operation of the machine due to web misloading. The distinguished pairs of web holes are so distinguished by extra holes in the web and the distinguished pair of pins of the two sprockets are so distinguished by extra pins on the sprockets or by causing the two distinguished pins to have a color or other visual characteristic different from that of the other pins.