Apparatus for machines for the automatic production of postal envelopes

Claim 1

In a machine for the automatic production of postal envelopes of the type including an echeloning station, a closure flap gumming station, a blank drawing station, and a drying station through which envelope blanks are successively moved by conveyors, means for varying the echelon unit width of the blanks in each of the stations and for varying the speed of the envelope blank conveyors through the stations with the same relative variance of echelon width, the means comprising: a drive shaft connected to drive the blank conveyor at one of the stations; mechanical drive connections from the conveyor at the drive shaft connected station to one of the other stations and from that station to the conveyor at the next station through all of the stations in a predetermined speed ratio so that the conveyor at each station provides a desired echelon width which may vary from the echelon width at another station, a draw key speed change gear in the drive shaft having an axially movable adjusting spindle to effect a speed change in the drive shaft, a controllable motor connected to drive the adjusting spindle, and means for locking the adjusting spindle in desired position.