| 摘要 |
PURPOSE:To prevent the generation of a printing obstruction due to a shock-streak and to enable the correction of registering disorder, by supporting the shaft of a plate cylinder by a bearing mechanism consisting of a needle bearing and the spherical bearing combined with the outer periphery of the needle bearing. CONSTITUTION:The bearing gap (r) of a plate cylinder 10 and a rubber cylinder 12 is killed by the bearer of a bearer contact mechanism and the axis of an impression cylinder 13 is slightly downwardly displaced in a printing start state but, because shock load F is transmitted to the plate cylinder 10 through the bearer 18, the axial displacement of the rubber cylinder 12 is not generated so far as the axis of the plate cylinder does not vary. Contrarily, even in a printing finish state, no displacement is similarly generated. Therefore, the change in the peripheral speed between the rubber cylinder 12 and the plate cylinder 10 is not also generated. When cocking is generated for registering, relative sliding is generated between the spherical guide surfaces between the inner and outer wheels of a spherical bearing 23 and the center points thereof come to load acting points 31a, 31b and, therefore, these points come to the centers of rotation at the time of cocking to prevent abnormal application of load of to a needle bearing. |
