Circumferential register assembly

Apparatus comprising a printing cylinder, first and second meshing helical gears, means supporting said first and second helical gears coaxially of the printing cylinder, means fixing a first one of said gears to said cylinder to rotate said cylinder and to move axially with said cylinder, means for moving said second helical gear axially relative to said first helical gear to effect a camming action therebetween and rotation of said first gear and said cylinder, and means for moving said cylinder and both of said gears simultaneously axially, said means for moving said second helical gear axially relative to the first helical gear to effect said camming action therebetween comprising a motor, a drive shaft drivingly rotated by said motor, a bracket member, cooperating engaged threads between said drive shaft and bracket member, means for resisting axial movement of the drive shaft, means for guiding axial movement of said bracket member, and means interconnecting said bracket member and said second helical gear to effect axial movement of said second helical gear upon axial movement of said bracket member.

Apparatus comprising a printing cylinder, first and second meshing helical gears, means supporting said first and second helical gears coaxially of the printing cylinder, means fixing a first one of said gears to said cylinder to rotate said cylinder and to move axially with said cylinder, means for moving said second helical gear axially relative to said first helical gear to effect a camming action therebetween and rotation of said first gear and said cylinder, and means for moving said cylinder and both of said gears simultaneously axially, and further including a motor and a drive means interconnecting said motor and said second helical gear to effect axial movement of said helical gear upon energization of said motor, said drive means including a slip connection therein enabling axial movement of a portion of said drive means and said second helical gear relative to said motor upon axial movement of said cylinder.

Apparatus comprising a printing cylinder, first and second meshing helical gears, means supporting said first and second helical gears coaxially of the printing cylinder, means fixing a first one of said gears to said cylinder to rotate said cylinder and to move axially with said cylinder, means for moving said second helical gear axially relative to said first helical gear to effect a camming action therebetween and rotation of said first gear and said cylinder, and means for moving said cylinder and both of said gears simultaneously axially, and wherein said means for moving said second helical gear axially comprises an electric motor and a drive means interposed between said motor and said second helical gear.