| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent monochrome and color link members from dropping while suppressing an increase in rotational torque and a capacity shortage of a clutch for transmitting driving force to a cam shaft. <P>SOLUTION: Drop preventing sections (second and third drop preventing sections 236 and 237) for preventing a second link member 22 that is a color link member from dropping can be provided to a monochrome cam section (first cam section 233). More specifically, it is not necessary to provide a second cam section 234 that is a color cam section requiring large rotational torque with any drop preventing section. On account of this, when a cam 23 is rotated by a driving source, the drop preventing section of the second cam section 234 never acts on the second link member 22, and occurrence of an increase in the rotational torque and a capacity shortage of a clutch for transmitting driving force to a cam shaft is suppressed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
