Wall saw having a locking device (41). A saw blade flange (25) of the wall saw is adjustable by the locking device (41) between a locked state and an unlocked state, wherein, in the locked state, the saw blade flange (25) is connected to the drive spindle (33) for rotation therewith, and, in the unlocked state, is adjustable in relation to the drive spindle (33). In the unlocked state of the saw blade flange, the drive spindle is blocked in the direction of rotation of the saw blade and is designed to be rotatable about the axis of rotation in a counter direction directed counter to the direction of rotation.

A guiding device for a saw band or a sawblade of a sawing machine is provided, which has at least one holder with at least one gliding part and/or at least one roll for an at least temporary gliding and/or rolling contact with the saw band or sawblade. The at least one gliding part and/or the at least one roll is provided on the holder in a movable fashion in reference to the holder, with the at least one gliding part and/or the at least one roll being movable in reference to the holder via at least one piezo-actuator, essentially perpendicular to the direction of movement of the saw band or sawblade. A sawing machine with such a guiding device is also provided.

A system and a method for improving safety in a cutting saw apparatus is disclosed. The system comprises an RC oscillation circuit connected to a cutting saw, a detection module to detect changes in the output of the circuit and a control module that controls the operation of the cutting saw. The user wears a conductive footwear when working with the cutting saw. The system also comprises a conductive layer disposed beneath the conductive footwear and the oscillation circuit to establish a conductive path. The user also wears hand gloves to enable working with conductive, non-conductive and semi-conductive materials. When the user's hands comes into contact with the cutting saw, the resistance characteristics of the circuit changes, resulting in a change in the output signal of the circuit. This change is detected by the detection module which triggers the control module to stop the cutting saw.

A system and a method for improving safety in a cutting saw apparatus is disclosed. The system comprises an RC oscillation circuit connected to a cutting saw, a detection module to detect changes in the output of the circuit and a control module that controls the operation of the cutting saw. The user wears a conductive footwear when working with the cutting saw. The system also comprises a conductive layer disposed beneath the conductive footwear and the oscillation circuit to establish a conductive path. The user also wears hand gloves to enable working with conductive, non-conductive and semi-conductive materials. When the user's hands comes into contact with the cutting saw, the resistance characteristics of the circuit changes, resulting in a change in the output signal of the circuit. This change is detected by the detection module which triggers the control module to stop the cutting saw.

A handheld work apparatus includes a work tool, a belt drive, a drive motor configured to drive the work tool via the belt drive, a brake unit configured to act on the belt drive, and a holding arrangement. The brake unit has a braking position and a released position and the holding arrangement is configured to hold the brake unit in the released position. The holding arrangement includes an electromagnet to which current is supplied during operation of the work apparatus.

A handheld work apparatus includes a work tool, a belt drive, a drive motor configured to drive the work tool via the belt drive, a brake unit configured to act on the belt drive, and a holding arrangement. The brake unit has a braking position and a released position and the holding arrangement is configured to hold the brake unit in the released position. The holding arrangement includes an electromagnet to which current is supplied during operation of the work apparatus.

A safety brake device for a power tool includes a decoupling device, configured to decouple an output unit from a drive unit during a braking operation thereby reducing at least one of a rotational mass and rotational energy of the output unit, and a brake device with a first brake device part and a second brake device part. The first brake device part is arranged on the output unit so as to allow essentially no relative rotation, and the second brake device part is configured to allow essentially no relative rotation with respect to the power tool. The first brake device part and the second brake device part are configured to interact mechanically with one another during a braking operation to stop rotation of the output unit. The first brake device part of the brake device is embodied in one piece with the decoupling device.

Machines with safety systems are disclosed. The machine may take the form of woodworking machines including table saws, band saws, miter saws, hand-held circular saws, pneumatic chop saws, radial-arm saws, jointers, planars, routers and shapers. The machines may include an operative structure configured to perform a task, where the operative structure includes a cutting tool adapted to move in at least one motion, and a safety system adapted to detect the occurrence of an unsafe condition between a person and the cutting tool and for mitigating the unsafe condition. The safety system may include a detection subsystem and a reaction subsystem. The machine may also include a bypass or override mode where in an injury mitigation system is disabled for certain cuts.

Machines with safety systems are disclosed. The machine may take the form of woodworking machines including table saws, band saws, miter saws, hand-held circular saws, pneumatic chop saws, radial-arm saws, jointers, planars, routers and shapers. The machines may include an operative structure configured to perform a task, where the operative structure includes a cutting tool adapted to move in at least one motion, and a safety system adapted to detect the occurrence of an unsafe condition between a person and the cutting tool and for mitigating the unsafe condition. The safety system may include a detection subsystem and a reaction subsystem. The machine may also include a bypass or override mode where in an injury mitigation system is disabled for certain cuts.

A safety brake device for a power tool includes a decoupling device, configured to decouple an output unit from a drive unit during a braking operation thereby reducing at least one of a rotational mass and rotational energy of the output unit, and a brake device with a first brake device part and a second brake device part. The first brake device part is arranged on the output unit so as to allow essentially no relative rotation, and the second brake device part is configured to allow essentially no relative rotation with respect to the power tool. The first brake device part and the second brake device part are configured to interact mechanically with one another during a braking operation to stop rotation of the output unit. The first brake device part of the brake device is embodied in one piece with the decoupling device.