| 摘要 |
<p>PURPOSE:To prevent the state of inability of operation made switching due to collision of thread tips of gears by loosely supporting gears to the extent not allowing release of engagement of a drive gear with a driven gear. CONSTITUTION:The diameter of bearing support hole 22 of a gear 16 is designed to be larger than the diameter of a rotary shaft 23 and a clearance for permit ting fine movement of the gear 16 is provided between the bearing hole 22 and the rotary shaft 23. If the diameter of the bearing 22 is set in such a way, provided that positioning of the rotary shaft 23 in the center of bearing hole 22 is considered the design center, the gear 16 can make fine movement in four directions within a standard range 1:0.25m-0.75m around the above design center. Thus the possibility of occurrence of inability of engagement due to collision of thread tips can be lowered.</p> |
