Push button for cyclical scanning of the stack height

摘要

A detector for periodically detecting the pile height of a feed pile (1) of a paper sheet processing machine, in particular a printing machine, having a lever drive mechanism with a scanning roll which is in constant contact, by means of a spring, with a drive cam which can be driven cyclically at least during the paper run, having a four-bar guide mechanism with two levers (14, 16, 18, 22) which are arranged one above the other, are mounted in each case with one lever end in an articulated manner on the frame, and are mounted in each case with their other lever end in an articulated manner on a coupler (20), spaced apart, a detector foot (8) being attached to a downwardly extending, vertical continuation of the coupler (20) to detect the pile height, having a carrier stop which is attached to the drive mechanism, having a stop surface (31) on the guide mechanism, which stop surface is arranged and designed to correspond to the carrier stop for the periodical production of a contact to raise the detector foot (8), and having a spring whose one spring bearing is attached fixedly to the machine and whose other spring bearing is attached to the guide mechanism and whose spring force presses the stop surface (31) in the direction towards the carrier stop. IMAGE