| 摘要 |
<p>PURPOSE:To stably support the cylindrical part of a rotary ring with simple constitution so as to easily execute assembly and analysis by freely rotatably supporting the cylindrical part of the rotary ring with plural rollers having small diameters. CONSTITUTION:A cylindrical part 2b having the large diameter in a rotary ring 2 arranged at the outer periphery of a track ball 1 is freely rotatably supported by the rollers 13a and 13c having the small diameters. One roller 13a among the plural rollers is constituted into a mobile roller, and the mobile roller 13a is press-fixed to the cylindrical part 2b of the rotary ring 2 by a press-fixing spring 17. A pressure ring 3 arranged between the outer periphery of the track ball 1 and the inner periphery of the rotary ring 2 is screwed to a screw cylinder for fixing 9 arranged at the outer periphery of the track ball 1 so that it can be attachable and detachable. Thus, the cylindrical part 2b having the large diameter of the rotary ring 2 can be supported with simple constitution, and the mobile roller 3a can be press-fixed to the cylindrical part 2b of the rotary ring 2 by the press-fixing spring 17. Thus, clattering owing to the precision of parts in the rotary ring 2 is eliminated, and the attachment/ detachment of the pressure ring 3 can be attached/detached only by rotation-operating the pressure ring 3.</p> |
