A power tool, comprising: a housing; a motor being disposed in the housing for outputting rotary power; an output shaft having an accommodating hole in the axial direction for holding a tool bit; a transmission mechanism, being disposed between the motor and the output shaft for transmitting rotary power from the motor to the output shaft; a tool bit supporting being disposed in the housing and including several chambers disposed in parallel for holding the tool bit; a connecting member being disposed in the housing and capable of moving axially between a working position where the connecting member passes through one of the chambers and to accommodate the tool bit in the chamber connect the output shaft, and a release position where the connecting member exits and separates from one of the several chambers; and an operating member is arranged on the housing for controlling the axial movement of the connecting member; the power tool further includes an automatic shifting means for adjusting the position of the tool bit supporting in response to the movement of the operating member, wherein the connecting member moves axially to a position that is separated from one of the several chambers, and the cartridge moves to a position where another chamber is axially corresponding to the output shaft under the action of the automatic shifting means.

An apparatus and a system comprise a collet comprising a top portion and a bottom portion. The top portion comprises a threading means. The bottom portion at least comprises means for holding the collet from rotating and means for retaining an end mill. A master comprises a top portion and a bottom portion. The top portion is configured for engagement with a spindle of a milling machine. The bottom portion comprises a threading means for engagement with the threading means of the collet, wherein the master is retained by the spindle and the collet engages and disengages the master by rotation of the spindle. The milling machine operates under computer control during engagement and disengagement of the collet from the master.

A tool changer includes at least one tool changer unit, wherein the at least one tool changer unit includes: a tool holder that receives and holds a tool; a base member that supports the tool holder so that the tool holder can be slid along a longitudinal direction of the tool; and a moving mechanism that slides the tool holder relative to the base member.

A hand power tool includes a tool receiver configured to receive a tool. The tool has an outer polygonal coupling and the tool receiver has an inner receiver including, at least portionally, a rotary driver profile. The tool receiver is provided on an associated tool housing, in which there is a drum-type tool change magazine having at least one tool chamber configured to store the tool. The tool chamber is configured to be aligned so as to be flush with the tool receiver to enable the tool to slide from the tool chamber into the inner receiver or from the inner receiver into the tool chamber. An alignment element is configured to align the outer polygonal coupling as the tool slides from the tool chamber into the inner receiver to enable the outer polygonal coupling to slide into the rotary driver profile.

A tool changer includes at least one tool changer unit, wherein the at least one tool changer unit includes: a tool holder that receives and holds a tool; a base member that supports the tool holder so that the tool holder can be slid along a longitudinal direction of the tool; and a moving mechanism that slides the tool holder relative to the base member.

A power tool including a housing, a motor, an output shaft, a cartridge, a connecting shaft, a restrictor, and a slider. The connecting shaft is configured to move between a working status in which the connecting shaft is coupled with a first tool bit in a first tool chamber which the connecting shaft passing through, and a release status in which the connecting shaft is separated from the first tool chamber. The restrictor is configured to move between a first position and a second position. The slider is configured to move along an axial direction to cause the restrictor to be moved from the first position to the second position.

A tool magazine device includes a rail that is annularly formed and that has a separation section at a part in a circumferential direction of the rail and a holding ring that is arranged coaxially with the rail and that is rotated by a driving motor. The holding ring is provided with a plurality of holding sections that are open in an axial direction of the holding ring. The holding sections are arranged in the circumferential direction of the holding ring. A tool pot is held to be insertable into and extractable from each holding section. A conveyance unit sends out the tool pot placed in the holding section to an exchange position and sends the tool pot into the holding section from the exchange position. A roller supported by each tool pot rolls on the rail in response to the rotation of the holding ring.

A power tool, comprising: a housing; a motor being disposed in the housing for outputting rotary power; an output shaft having an accommodating hole in the axial direction for holding a tool bit; a transmission mechanism, being disposed between the motor and the output shaft for transmitting rotary power from the motor to the output shaft; a tool bit supporting being disposed in the housing and including several chambers disposed in parallel for holding the tool bit; a connecting member being disposed in the housing and capable of moving axially between a working position where the connecting member passes through one of the chambers and to accommodate the tool bit in the chamber connect the output shaft, and a release position where the connecting member exits and separates from one of the several chambers; and an operating member is arranged on the housing for controlling the axial movement of the connecting member; the power tool further includes an automatic shifting means for adjusting the position of the tool bit supporting in response to the movement of the operating member, wherein the connecting member moves axially to a position that is separated from one of the several chambers, and the cartridge moves to a position where another chamber is axially corresponding to the output shaft under the action of the automatic shifting means.

A power tool, comprising: a housing; a motor being disposed in the housing for outputting rotary power; an output shaft having an accommodating hole in the axial direction for holding a tool bit; a transmission mechanism, being disposed between the motor and the output shaft for transmitting rotary power from the motor to the output shaft; a tool bit supporting being disposed in the housing and including several chambers disposed in parallel for holding the tool bit; a connecting member being disposed in the housing and capable of moving axially between a working position where the connecting member passes through one of the chambers and to accommodate the tool bit in the chamber connect the output shaft, and a release position where the connecting member exits and separates from one of the several chambers; and an operating member is arranged on the housing for controlling the axial movement of the connecting member; the power tool further includes an automatic shifting means for adjusting the position of the tool bit supporting in response to the movement of the operating member, wherein the connecting member moves axially to a position that is separated from one of the several chambers, and the cartridge moves to a position where another chamber is axially corresponding to the output shaft under the action of the automatic shifting means.

A protection tool for an electronic drill provides various functions when drilling is carried out. The electronic drill has a front end with a through hole located at the front end and a drill head extending through out the through hole. The protection tool is moveably mounted at the front end of the electronic drill along an operation direction. A guard plate includes a pore aligning with the through hole and provides pass way for the drill head. A supporting frame is assembled with the guard plate and is moveably mounted at the front end of the electronic drill along the operation direction, so that the guard plate is positioned at a variable distance from the front end according to the movement of the supporting frame with respect to the front end.