| 摘要 |
A keyhole type saw is provided which includes transverse stroke control apparatus for controlling the movement of the saw blade in a direction transverse to the linear stroke path. According to preferred embodiments, the transverse stroke control apparatus includes a rotatable blade guide roll engageable directly with the saw blade, which guide roll is in turn carried at a guide lever arm. A rotary plate is supported in the housing of the saw and includes a pivot connection for a swing arm which has the other end engageable at the guide lever arm by way of cam surfaces, whereby the position of the swing arm directly controls the presenting transverse stroke of the blade guide roll and saw blades. To accommodate adjustment of the transverse travel path for the presenting stroke, the rotary plate is mounted about an axis spaced from the pivot axis for the swing arm, whereby simple rotational movement of the rotary plate adjusts the pivot axis of the swing arm, and therewith the presenting stroke of the guide roll against the rear of the saw blade.
|
