| 摘要 |
<p>PURPOSE:To remarkably reduce the number of parts and the cost of parts and to perform assembling work and deburring work, as well quite simply in constitution loading a loading ring on a drum base rotatably. CONSTITUTION:Three projecting parts 31, 32 projecting in the direction of a radius are provided on the inner peripheral parts of the loading rings 1, 2 and a ring loading part 3a is provided on the lower part of the drum base 3 attaching a rotational head drum 20 and groove parts 41, 42 are formed on the outer peripheral part of the ring loading part 3a and three positions of a guiding part 41a, 42a are provided on these groove parts 41, 42. The rings 1, 2 are supported to the drum base 3 rotatably by inserting and engaging respective projecting parts 31, 32 of the rings 1, 2 into the groove parts 41, 42 from respective guiding parts 41a, 42a.</p> |
