| 摘要 |
PURPOSE:To make the device simpler, lower in cost and higher in reliability by providing a plurality of bearings constituted by rolling members and outer races on the peripheral surface of a cylindrical member and providing means of pressing the same to the outside surface of the outer races. CONSTITUTION:An opposing object 2 constituted as multistylus electrode is opposedly disposed to the peripheral surface 1a of a cylindrical memeber 1 constututed as a donor drum. A plurality of rolling memebers 3, e.g., bearings, are provided on the peripheral surfaces at both ends of the doner drum 1. The rolling members 3 are balls made of elastic material such as nylon. The multistylus electrode 2 is supported by a positioning memeber 5, said positioning member 5 being in contact with the outside surface of the outer race 4. The positioning member 5 is pressed in the axial center direction by the acting force F of a pressing spring 6. By increasing the number of the elastic balls 3, the accuracy of high reliability may be obtained with the simple mechanism. |
