Reversible ribbon drive

摘要

A web drive system for automatically reversing the direction of travel of the web when the end of the web is reached. A reversible electric motor provides power to either the supply or take up spindles. An end of the web is affixed to each of the spindles so that either spindle can be provided with power to draw the web from the other spindle. A planetary gear system provides power to whichever spindle acts as the take up spindle until the end of the web is sensed. The motor is then reversed and the planetary gear then provides power to the other spindle, which was previously the supply spindle.