Abstract: A sawing machine having a spindle and circular saws thereon adapted to rotate with and axially slidably mounted on the spindle. A movable joint member or a one-way clutch is provided between the spindle and the saws. While the spindle is rotating at a low speed or is at a stop, the joint member or the clutch is in its inoperative position, keeping the saws disengaged from the spindle so that the distances between the adjacent saws can be adjusted freely. When the spindle begins to rotate at a high speed, the joint member is moved outwardly or the clutch is engaged by centrifugal force, thus locking the circular saws to the spindle.

Abstract: A compressor having a starting load reducing apparatus comprises a main compressor body for compressing gas obtained under suction from an intake chamber through an intake valve within a compression chamber, and ejecting the compressed gas through an outlet opening, a motor for driving the main compressor body, a switch for starting the motor by closing, a solenoid mechanism operated by the closing of the switch, for forcibly communicating the compression chamber with the intake chamber, to put the main compressor body into a non-compressing operational state, and a positive thermally sensitive resistor element connected at a stage before a coil of the solenoid mechanism. The solenoid mechanism operates after the switch is closed until the time when the resistance of the positive thermally sensitive resistor element reaches a predetermined resistance.