An electric work machine according to one aspect of the present disclosure includes a motor, a drive circuit, and a control circuit. The control circuit includes a physical quantity obtainer, a variation obtainer, a sum calculator, and a drive controller. The physical quantity obtainer obtains a physical quantity every time a detection timing arrives. The variation obtainer obtains a variation of the physical quantity every time the detection timing arrives. The sum calculator calculates a sum value every time the detection timing arrives. The sum value corresponds to a sum of one or more variations. The drive controller controls the motor in accordance with a first control system via the drive circuit based on the sum value satisfying a no-load detection requirement.

Provided is a working machine in which a counterweight is appropriately supported, thereby avoiding deterioration of workability. The working machine includes: a motor; a plunger reciprocated in a front-back direction by a drive of the motor; a crankshaft rotated around an axis extending in an up-down direction by the drive of the motor; a counterweight driven in a front-back direction by rotation of the crankshaft so as to cancel out vibration due to the reciprocation of the plunger; a transmission mechanism (gear, crankshaft, and connector) converting a rotation driving force of the motor into a driving force for the plunger and counterweight and transmitting the driving force to the plunger and counterweight; and a gear case (transmission mechanism accommodation portion and lid portion) accommodating the transmission mechanism and elastically supporting the counterweight in the right-left direction.

A jigsaw includes a main body having a grasping part configured to be grasped by a user, a blade projecting downwardly from a front part of the main body and configured to reciprocate up and down, and a base coupled to a lower part of the main body and configured to make contact with a workpiece. A rear end of a contact surface that is configured to make contact with the workpiece is located at a position that coincides with or is rearward of the rear end of the grasping part.

A reciprocating drive mechanism for a power tool includes a rotatably mounted transmission shaft that has a first central axis, a spindle with a spindle body, and a counterweight for linearly reciprocating motion under the guide of at least one guiding rod. A wobble plate is mounted on the transmission shaft and includes a first arm and second arms extending in opposite directions. The first arm and second arms are configured to cooperate with the spindle and the counterweight respectively so that, upon rotation of the transmission shaft, the first and second arms of the wobble plate drive the spindle and the counterweight to reciprocate in opposite directions parallel to the second central axis. An angle is formed between the extending direction of the first arm and the second arm and a plane defined by the first central axis and the second central axis.

A transmission device is configured to generate at least one of a stroke motion and a reciprocating motion of an insert tool of a hand-held power tool, and includes at least one link unit configured to generate the stroke motion. The link unit includes at least one output element, at least one link element, at least one contact surface, and at least one further contact surface. The at least one contact surface is disposed at least partially on the at least one output element. The at least one link element is configured to act in combination with the at least one output element via the at least one contact surface. The at least one further contact surface is configured to generate a force that initiates the reciprocating motion, and is disposed at least partially on the at least one output element.

In accordance with one embodiment, a reciprocating saw includes a housing, a plunger at least partially positioned within the housing and configured to reciprocate with respect to the housing along a plunger axis, a wobble plate assembly operably connected to the plunger and a motor, a first guide rail supported by the housing and extending longitudinally along the plunger axis, and a spherical component in contact with the first guide rail, the spherical component and the first guide rail configured to inhibit rotation of the wobble plate assembly.

The disclosure relates to a jigsaw having a housing unit and a base plate, wherein the housing unit is at least 25%, in particular around 40-60%, longer than the base plate in the longitudinal direction of the jigsaw. According to the disclosure, the housing unit and the base plate are bracingly interconnected, in particular in a rigid or damped manner, by means of two connecting regions, which are mutually spaced in the longitudinal direction of the jigsaw, in particular comprising bearing and/or fixing points.

A reciprocating cutting tool reduces dispersion of dust. The reciprocating cutting tool includes a reciprocation converter drivable by a motor, a rod-like slider connected to the reciprocation converter to be reciprocable, a blade holder at the front end of the slider to hold a blade, a power transmission housing housing the reciprocation converter and allowing the slider to protrude from its front end, a cover outward from the power transmission housing, and a fan rotatable together with a rotor in the motor. A first passage of cooling air from the fan is defined between the power transmission housing and the cover. The first passage branches into a second passage toward the blade holder and a third passage not toward the blade holder.

A work machine includes: a motor; a drive mechanism, connected to the motor and operating a tip tool; and a case, accommodating the drive mechanism. The drive mechanism includes: a first drive member, rotationally driven about an axis by the motor; a second drive member, reciprocally driven by the motor; and a support member, fixed to the case, restricting movement of the first drive member in a direction of the axis, and supporting the second drive member so that the second drive member is reciprocally drivable.

A hand-guided stroke-type saw includes a stroke rod and a saw-blade receiver that is supported by the stroke rod. The stroke rod defines a stroke axis extending axially through the stroke rod. The saw-blade receiver is configured to receive a saw blade and defines a saw-blade receiver axis that extends axially through the saw-blade receiver and is substantially parallel to the stroke axis such that the saw-blade receiver is offset radially from the stroke axis in a first direction opposite to a direction of advance.