| 摘要 |
PROBLEM TO BE SOLVED: To certainly attach a saw blade to a predetermined position in a state detached with one hand by constituting a fixing device of a fixing support member, a spring fixing member and a release lever in order to attach the saw blade to a drive shaft. SOLUTION: A saw blade 38 is operatively connected to a drive shaft 30 and, when a release lever 62 is present at a first stable position, the leg 170 of a lever 62 slightly protrudes from the upper part 212 of a side wall 34. When a worker grasps the free end 214 of the lever 62 to revolve the same clockwise against the pressing force of a torsion spring, the leg 172 of the lever 62 is engaged with the spring tab part 136 of the spring fixing member 60 and the curved central part of the spring fixing member 60 forms a gap 224 between the member 60 and the blade saw 38 by the elastic displacement thereof. When the release lever 62 approaches a second stable position, the lever 62 is pressed to a stop surface 218 by the pressing force of the spring fixing member 60 from the positional relation between the engaging surface 222 of the leg 172 and the drive shaft to be stopped. As a result, the worker makes both hands free to enable the replacing operation of the saw blade 38. |
