Clamping device for a compass sawing machine

Clamping device for a saw blade of a hand-operated compass sawing machine, the saw blade being movable in parallel to a longitudinal axis of the saw blade by means of a plunger driven according to a sawing stroke in a housing of the compass sawing machine, the saw blade having two dogs at a clamped end, the clamping device comprising:

• a centering sleeve defining an interior region for receiving said clamped end of said saw blade, said centering sleeve having an outer inclined plane surface;
• a clamping sleeve mounted rotatably about said longitudinal axis, said clamping sleeve having an inclined surface engaging said centering sleeve inclined surface;
• spring means between said clamping sleeve and said centering sleeve for axial movement of said clamping sleeve upon relative rotation between said centering sleeve inclined surface and said clamping sleeve inclined surface to generate a clamping force for clamping said dogs of said clamped end of said saw blade in said centering sleeve to achieve a clamping position;
• adjusting means for rotating said clamping sleeve from said clamping position into a releasing position against the force of said spring, said adjusting means including an axially nondisplaceably mounted connection bush, said connection bush has an axis of rotation for pivoting said housing, said connection bush axis of rotation being approximately around said longitudinal axis, a gripping member being connected to said connection bush and extending through an opening in said housing, said connection bush forming a stop edge having a length extending in said axial direction, said length being at least as long as a sawing stroke of said sawing machine, said clamping sleeve having an actuating cam, said stop edge being located opposite said actuating cam for rotating said clamping sleeve upon movement of said gripping member from a clamping position into a releasing position.