Motor-driven compass saw blade - has mounting between anchor pegs and pushed against work by sprung roller on forward stroke

摘要

The blade (1) of a motor-driven compass saw has a hole (2) at one end for attachment to the driving mechanism. The other end of the blade has a hole (3) for fixing a tension spring (4). This spring presses the sloping end (5) of the blade against a support roller (6). During the working downward stroke the blade is pressed against the workpiece by the roller. During the return stroke the blade is held clear of the workpiece by the spring. This method of blade support reduces the risk of blade breakage when cutting hard materials.