| 摘要 |
PURPOSE:To obtain a stable cleaning effect on a head and a rotary drum for a long time by supporting a cylindrical sponge by a ball bearing to a lever shaft in a position of a boundary part between the rotary drum and a fixed drum. CONSTITUTION:A shaft 7 which is parallel to an axial center of a head drum 1 is provided at one end of a lever 5 which is freely rotatable, and in the boundary part between the rotary drum 11 and the fixed drum 12 which constitute the head drum 1, the cylindrical sponge 8 is supported via one ball bearing 13 at the shaft 7, and this sponge 8 is constituted to be abutted against the rotary drum 11 and fixed drum 12. That is, the sponge 8 can be in pressurized contact with the rotary drum 11 and the fixed drum 12 by force of uniformity owing to the aligning function of the ball bearing 13. By this method, even in case of the sponge 8 being poor in cylindricity and bad in parallel with the shaft 7, and moreover even when the sponge 8 is changed with time, the stable cleaning effect can be obtained for the head and the rotary drum 11 over a long period of time. |
