| 摘要 |
The present invention eliminates backlash between a drive helical gear and a driven helical gear and facilitates rotation of a driven gear member to increase rotational accuracy of a plate cylinder. A plate cylinder drive unit 3 includes a plate cylinder drive shaft 5, a driven gear member 7 having a driven helical gear 6 that meshes with a drive helical gear 1 and attached around the plate cylinder drive shaft 5, a position adjustment member 11 moving the driven gear member 7 to fix it at a predetermined position, a whirl-stop member 9 attached to the plate cylinder drive shaft 5, a sandwiching member 10 removably fixing the whirl-stop member 9 to the driven gear member 7, a backlash eliminating helical gear 8 disposed on one side of the driven helical gear 6, first springs 44 bringing the backlash eliminating helical gear 8 in pressure-contact with the driven helical gear 6, and second springs 46 biasing the backlash eliminating helical gear 8 to rotate it in a predetermined direction. |
