| 摘要 |
PURPOSE:To simplify a construction and an assembly and to realize highly accurate rotation by installing outer wheels made into one with a shaft in a housing and press-fixing the top part of the outer wheel. CONSTITUTION:A rotary cylinder 10 fixed with the video head 12 is fixed to the shaft 16 and driven and rotated by a motor 26. The outer wheels 20a and 20b are held freely and rotably by means of balls 18a and 18b is two; upper and lower grooves of the shaft 16, and in the midway thereof a preloaded spring 24 is provided to eliminate a play. The outer wheel 20a is engaged in the housing 14 and its top is press-fixed by means of a cap 22. For this reason, the construction and assembly can be greatly simplified without using a conventional adhesion-fixing method. Furthermore, the height change of the head 12 becomes small and highly accurate rotation can be achieved. |
