| 摘要 |
The present invention relates to a gear reducer for printing machine or the like comprising a hand wheel adapted to provide rough and fine adjustment modes, the hand wheel is mounted on a sleeve adapted to be engaged with a drive shaft of said printing machine. A planet wheel mounted on the hand wheel by means of a pin shaft extending parallel to the sleeve, a drive gear mounted on the sleeve, said drive gear adapted to turn together with the sleeve. A lock means is adapted to retain the hand wheel locked on the sleeve. A fixed gear mounted on a frame of said press machine, the fixed gear being coaxial with said drive gear. The fixed gear has a number of teeth which differs from the number of teeth of the drive gear. The hand wheel is adapted to move together with the planet wheel gear axially forwardly towards said fixed gear. In the rough adjustment mode the hand wheel is being retained by the lock means engaged on the sleeve, the hand wheel is adapted to activate said drive shaft by means of the sleeve. In the fine adjustment mode the hand wheel being disengaged from the lock means by means of axial forward movement towards the fixed gear, and the planet wheel gear being simultaneously meshed with the drive gear and the fixed gear.
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