Patent ID: 7596873

Claim:
A motor-driven compass saw machine ( 1 ), having a housing ( 2 ) that contains a longitudinally moving lifter rod ( 4 ), which supports a saw blade ( 3 ), and an oscillation mechanism that is able to impart a variable oscillation stroke, which is oriented lateral to the longitudinal motion, to the saw blade ( 3 ), wherein the oscillation mechanism includes means for automatically adjusting the oscillation stroke smoothly between the maximum and minimum stroke during the sawing process, as an automatic response to a function of the pressure of the saw blade ( 3 ) against a work piece to be sawn, and a roller lever ( 5 ) which is disposed in the housing ( 2 ) and supports a roller ( 51 ) that remains in contact with the saw blade ( 3 ); and wherein said means for automatically adjusting the oscillation stroke comprises a spring element ( 53 ) which acts on said roller lever ( 5 ) such that said spring element ( 53 ) is compressed further as the pressure of the saw blade against a work piece to be sawn increases and a larger oscillation is produced.