A protective apparatus and a machine tool are provided. The machine tool includes an operational element, a driving element, and the protective apparatus. The operational element and the driving element are disposed on machine table. The protective apparatus includes an insulating unit, conducting unit, capacitance sensor, and control unit. The insulating unit is disposed between the operational element and the driving element. The driving element drives the operational element by the insulating unit. The conducting unit contacts the operational element. The capacitance sensor electrically connects the conducting unit for sensing capacitance of the conducting unit. The control unit electrically connects the capacitance sensor and the driving element and determines whether a user approaches the operational element based on the capacitance. When the control unit detects that the distance between the user and the operational element is too close, the control unit stops the operation of the operational element.

A single-hand operable portable hand-held saw, including a handle portion with a motor. The motor is operably connected to one or more drive gears positioned on an interior side of a protective cover. One or more idle gears are positioned on an interior side of the protective cover. The idle gears and the drive gears are operatively coupled with and rotatably engaged with an annular saw blade. A throat opening in the protective cover is positioned adjacent a stop guide for stabilizing the saw against a material during cutting operations.

A compound saw includes a base, a housing, a transmission component and a table, the rear end of the table is rotatably connected to the housing, and is engaged with the cutter head through the transmission component, so as to expose the cutter head out of the first cutting slit or out of the second cutting slit when the front end of the table swings upward and downward. The cutter head of the compound saw can be switched between the bench cutting mode and the miter cutting mode. Accordingly, on one hand, the structure for switching between modes is simple and does not require the cooperation of too many parts; on the other hand, the switchover can be realized simply by manually operating the movable bench, without too many operations.

A miter saw with a pivotally rotatable extension includes a base, a worktable, a cutting member, and an extension member. The base has a pair of lateral edges oppositely extending along a longitudinal direction, a top surface correspondingly engaged to each lateral edge. The worktable is rotatably mounted to the base, and has a work surface corresponding to the top surface. The cutting member is connected to the worktable. The extension member is pivotally mounted to one of the lateral sides of the base. The extension member is convertible between an extended position and a retracted position relative to the base. The extension member has an extension surface. At the extended position, the extension surface is engaged to the top surface longitudinally for supporting a workpiece. At the retracted position, the extension surface is substantially perpendicular to the top surface for minimizing the size of the miter saw.

A cross-cutting circular saw device comprising: a frame (1); a guide (10) carried by the frame (1) and adapted to span an object (5) to be cross-cut by sawing; a carriage (3) mounted for reciprocal movement along the guide (10); at least one circular saw blade (4A, 4B) carried by the carriage (3); a motor (11) for moving the carriage (3) and rotating said at least one saw blade (4A, 4B), said motor (11) being fixed to the frame (1); a first transmission (2) arranged between the motor (11) and the carriage (3) for transforming an output of the motor to a reciprocating movement of the carriage (3) along the guide (10); and a second transmission (8, 9) arranged between the carriage (3) and the at least one saw blade (4A, 4B) for transforming the reciprocating movement of the carriage (3) to a rotation of said at least one saw blade (4A, 4B).

A circular saw includes a housing assembly and a drive motor assembly coupled to the housing assembly. An output member is driven by the drive motor assembly. A shoe is adjustably mounted to the housing assembly. A circular saw blade has a diameter of about 7.3 inches. The shoe can be adjusted to provide a depth of cut that is greater than or equal to about 3.0 inches.

A fluid-driven ring saw includes a ring saw blade that is supported and driven by a fluid. The fluid-driven ring saw can include one or more pairs of fluid nozzles. Each pair of fluid nozzles can include a first fluid nozzle separated from a second fluid nozzle by a gap. The ring blade can be positioned within the gap. The ring blade can include a plurality of holes. The one or more pairs of fluid nozzles can deliver fluid jets that impinge upon the plurality of holes of the ring blade to drive rotation of the ring blade. The ring blade can be driven without direct contact of a mechanical linkage, such as a belt or chain. The ring blade can be relatively thinner than ring blades driven by mechanical linkages.

The invention relates to a separating device which is used for machining of workpieces, preferably workpieces made from wood, wood materials, insulating materials or composite materials.

A table saw includes a base assembly, a table assembly supported by the base assembly, and a saw assembly supported by the base assembly. The saw assembly has a motor having a motor output shaft and a power train assembly. The motor is configured to rotate the motor output shaft at a first rotational speed. The power train assembly includes an intermediate shaft, a first gear stage, an arbor shaft, and a second gear stage. The first gear stage is configured to transmit rotation of the motor output shaft at the first rotational speed to rotation of the intermediate shaft at a second rotational speed, which is less than the first rotational speed. The second gear stage is configured to transmit rotation of the intermediate shaft at the second rotational speed to rotation of the arbor shaft at a third rotational speed, which is greater than the second rotational speed.

A ring saw blade includes a flat annular support which has a side face and an outer circumference. One or more cutting elements are disposed along the outer circumference. An annular groove is recessed into the side face and has a radially inner flank and a radially outer flank. The radially inner flank is conical and a first cone describing the radially inner flank has a half opening angle of between 10 degrees and 30 degrees.