A high-precision linear actuator (1) comprises: a first straight-guide mechanism (11A, 11B, 11C), which guides movements of an actuator element (4) and a working device (6) relative to an actuator housing (3); a pressing mechanism (7, 8, 9), which in a pressing-contact condition presses the actuator frame (2) and the actuator housing (3) with a predetermined force against one another; and a second straight-guide mechanism (12A, 12B), which guides movements of the actuator housing relative to the actuator frame between said pressing-contact condition and released-contact conditions in which the pressing mechanism presses the actuator frame and the actuator housing towards one another. The invention provides a safety mechanism which automatically reinstates negative consequences of unforeseen collisions in the working environment. In addition the invention allows for a compact and light-weight design of the actuator element and the working device, which improves operational speed and effectivity of the linear actuator.

Percussion unit, especially for a rotary hammer and/or percussion hammer, comprising a control unit which is designed for open-loop and/or closed loop control of a pneumatic percussion mechanism, and at least one operating condition sensor unit. According to the disclosure, the control unit is designed to detect at least one percussion mechanism parameter depending on measurement values of the operating condition sensor unit.

One example provides a filament feeding device and a method for guiding a filament into an additive manufacturing apparatus, the filament feeding device comprising: a filament travel path; a filament buffer comprising a telescopic tubular assembly comprising a filament entrance at a first end of the tubular assembly and a filament exit at a second end of the tubular assembly, the tubular assembly comprising: a first tube having a first tube longitudinal centerline; and a second tube comprising a portion into which a portion of the first tube is telescopically inserted; and a position sensor; a controller connected to the position sensor; and a computer-readable non-volatile storage device, wherein the position sensor is configured for measuring a position of the first tube with respect to a reference point.

Disclosed is a method and a tag feeder for feeding tags in a feeding direction to a dispensing position within a clipping machine. The tag feeder is provided with a feeding mechanism with at least one pusher means for transporting a chain of tags. The pusher means is reversible movable parallel to the feeding direction between a first and second position wherein, in the first position, the pusher means is in a minimum displacement to the dispensing position, and wherein, in the second position, the pusher means are in a maximum displacement to the dispensing position. The feeding mechanism comprises at least one cutting tool for cutting-off the foremost tag of the chain of tags, viewed in the feeding direction, in the first position and at least one clamping device for clamping the chain of tags when the foremost tag is arranged in the first position.

A torque tool includes an electrical machine drive system, an electronic controller and a gear system. The drive system includes a rotor and a stator. The rotor includes a pattern of regions of relatively high magnetic permeability interspersed with regions of relatively low magnetic permeability extending generally parallel to the motor shaft such that there is a plurality of magnetic poles distributed circumferentially around the motor shaft. The stator includes electrical windings dispersed in slots disposed around an inner surface of the stator, the slots extending generally parallel to the motor shaft such that, when current flows in the windings, a stator magnetic field generated by the current has the same number of magnetic poles as the rotor. The electronic controller is configured to control the current flow in the stator windings to cause the stator poles to rotate in synchronism with rotation of the motor.

The present invention provides methods and systems for a rotary impact device having an annular exterior surface for use with an impact wrench for providing torque to a fastener. The rotary impact device includes an input member having an input recess for receiving the anvil of the impact wrench, an output member having an output recess for receiving the fastener, and an inertia member. The inertia member is stationary and positioned on the exterior surface of the rotary impact device for increasing the torque applied to the fastener.

A handheld work apparatus includes a work tool. The work apparatus defines a longitudinal plane and includes a handle having a longitudinal axis. The blocking lever is mounted so as to be pivotable about a rotational axis. The blocking lever blocks the actuating lever in a blocking or disable position and enables the actuating lever for actuation in at least one operating enable position. In the direction of view perpendicular to the longitudinal plane, the longitudinal axis of the handle and the rotational axis of the blocking lever conjointly define an angle (). The angle () lies in a range of from 10 to 60.