Abstract: A saw blade positioning mechanism for an annular sawing machine includes a protective case, two first driven wheels, two second driven wheels, and an adjustment component. The protective case conceals a portion of an annular saw blade. The first and second driven wheels are rotatably disposed at two opposing ends of the protective case and abut against two opposing lateral sides of the annular saw blade, respectively. The adjustment component is disposed at the protective case to drive the protective case to move in the radial direction of the annular saw blade relative to the annular saw blade. The position of the protective case is adjusted with the adjustment component such that the first and second driven wheels get positioned in place synchronously with displacement of the protective case. The protective case can be demounted so that the first and second driven wheels are simultaneously removed and changed.

Abstract: A horizontal sawing machine includes a support unit, a driving unit, and a sawing unit. The support unit has a slide rail base with two oppositely disposed stationary slide rails. The driving unit has a driving motor, a reducing gear box, and two oppositely disposed movable slide rails. The reducing gear box is connected to the driving motor and has an output shaft. The movable slide rails are provided on the outer periphery of the reducing gear box and are respectively engaged with the stationary slide rails to enable forward and backward movement of the driving unit with respect to the support unit. The sawing unit has a saw blade and a saw blade mount connected between the bottom end of the output shaft and the saw blade so that the saw blade is rotatable by and movable forward and backward along with the driving unit to facilitate operation.

Abstract: A drilling/tapping/unscrewing apparatus including a transmission shaft of a power source on which a drilling ratio gear, a tapping ratio gear and an unscrewing ratio gear are mounted for transmitting the power of the power source to a bit. The apparatus further includes an adjustment unit for controlling the switching between the drilling, tapping and unscrewing operations of the apparatus. The adjustment mechanism includes a bit shaft on which a drilling gear, a tapping gear and an unscrewing gear are fitted. The tapping gear and the unscrewing gear are respectively engaged with the tapping ratio gear and the unscrewing ratio gear. The drilling gear and the tapping gear are controlled by an adjustment button to synchronously move up and down on the bit shaft, whereby the drilling gear can be engaged with or disengaged from the drilling ratio gear.

Abstract: Transmission mechanism of drilling/milling tool, including a motor capable of forward and backward rotating. The motor has a transmission shaft for transmitting the power to the transmission mechanism. The transmission mechanism further includes a movable slide gear, a first and a second driven wheels constantly engaged with the slide gear and a brake or shaft mounted on a driving wheel or the driven wheel. The slide gear is responsive to the forward and backward rotation of the transmission shaft to axially move along the brake or shaft to selectively drivingly engage with the first or second driven wheel. In the forward and backward travel of the drill bit or blade, the drill bit or blade is rotated at high or low rotational speed.

Abstract: Transmission mechanism of drilling/milling tool, including a motor capable of forward and backward rotating. The motor has a transmission shaft for transmitting the power to the transmission mechanism. The transmission mechanism further includes a movable slide gear, a first and a second driven wheels constantly engaged with the slide gear and a brake or shaft mounted on a driving wheel or the driven wheel. The slide gear is responsive to the forward and backward rotation of the transmission shaft to axially move along the brake or shaft to selectively drivingly engage with the first or second driven wheel. In the forward and backward travel of the drill bit or blade, the drill bit or blade is rotated at high or low rotational speed.