Angular and axial adjustment mechanism for a printing cylinder

Claim 1

Angular and axial adjustment mechanism for a printing cylinder of a rotary press, the press comprising bearings for each cylinder which is to be adjusted, said bearings supporting the cylinder trunnions and including first means for with respect to the machine frames, a control member, a coupling meaNs connecting said control member to one of the said cylinder trunnions so as to prevent axial play but allow free rotation of said trunnions, second means to displace said control member and thus said cylinder with respect to said frames in a direction parallel to the axis of said cylinder, trunnion and forming one of the parts of the general line of drive of the machine, one of these two gearwheels being a helical gearwheel, the other being a helical gearwheel having a different helix angle from that of the first gearwheel, a double gearwheel comprising two sets of teeth respectively meshing with said first and said second gearwheels, third means for freely mounting said double gearwheel for rotation about a shaft while maintaining said double gearwheel in fixed axial position on said shaft, fourth means for axially displacing said shaft with said double gearwheel in a direction parallel to the axis of said cylinder to thus secure angular adjustment, said fourth means being rigidly secured to and moveable with said control member whereby axial displacement of said cylinder by said second means causes corresponding axial displacement of said double gearwheel, said fourth means being capable of actuation independently of said second means.