Appeal No. 2006-1915
Application No. 10/056,312
means for transmitting rotation from the motor shaft 12 to the saw shaft 9 (col. 2,
ll. 41-67). Ushiwata discloses two different embodiments of the transmission
means. In the first embodiment (Figs. 1 and 2), the transmission element is a belt
13. In the second embodiment (Figs. 12 and 13), the transmission means is a gear
17 (col. 3, ll. 21-23). According to Ushiwata, disposal of the motor shaft in
parallel with the saw shaft, over the saw shaft, permits the saw assembly to be
tilted toward the side of the motor (col. 3, l. 65 to col. 4, l. 1).
Tsune discloses a circular saw cutting machine provided with a backlash
eliminator 16. Tsune (col. 1, ll. 12-18) describes backlash as follows:
In circular saws of the type described above, upon
starting of the cutting of the workpiece to be cut by
rotation of the saw, vibration or impact can occur in the
saw due to a backlash between a final stage gear and an
earlier stage gear engaging each other in the saw drive.
Such vibration or impact on the saw inherently degrades
the accuracy of the cutting of the workpiece and can
cause damage to the saw.
In Tsune’s machine, a saw drive 8 rotates a saw blade 4. The saw blade is
mounted on a saw shaft 7. The saw drive 8 includes a plurality of geared driving
stages. The saw drive 8 also includes a motor (not shown) and drive shaft 10, an
intermediate transmission shaft 11 arranged between the drive shaft 10 and saw
shaft 7 parallel to the drive shaft 10, gears 12 and 13 for transmitting rotation of the
drive shaft 10 to the intermediate shaft 11, and gears 14 and 15 for transmitting
rotation of the intermediate shaft 11 to the saw shaft 7. The motor drives the drive
shaft via a belt (not shown) and a pulley 9. Col. 2, ll. 8-22. A backlash eliminator
4
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Last modified: September 9, 2013