Abstract: An automatic working system includes a self-moving device moving and working inside a defined working area and an energy module supplying power to the self-moving device. The self-moving device includes a body, a movement module, a task execution module, and a control module. The energy module is selectively configured to supply power to the self-moving device or another electric tool different from the self-moving device. The self-moving device includes an accommodating cavity provided with an inlet and configured to accommodate the energy module and a protective cover configured to operably block the inlet. The self-moving device further includes a drainage system configured to drain water to prevent water from entering the accommodating cavity.

Abstract: An automatic working system includes a self-moving device powered by an energy module and moving and working in a defined working area. The self-moving device includes a body, a movement module, a task execution module, a control module, and a charging system configured to store external electrical energy in the energy module to charge the energy module. The charging system includes at least two charging modes for charging the energy module. In the different charging modes, the charging system uses different charging logics and/or different charging parameters to charge the energy module. The charging system further includes a charging management module configured to manage the charging modes, to enable the charging system to use a corresponding charging mode to charge the energy module.

Abstract: An automatic working system includes a self-moving device powered by an energy module and moving and working in a defined working area. The self-moving device includes a body, a movement module, a task execution module, a control module, and a charging system configured to store external electrical energy in the energy module to charge the energy module. The charging system includes at least two charging modes for charging the energy module. In the different charging modes, the charging system uses different charging logics and/or different charging parameters to charge the energy module. The charging system further includes a charging management module configured to manage the charging modes, to enable the charging system to use a corresponding charging mode to charge the energy module.

Abstract: An automatic working system includes a self-moving device moving and working inside a defined working area and an energy module supplying power to the self-moving device. The self-moving device includes a body, a movement module, a task execution module, and a control module. The energy module is selectively configured to supply power to the self-moving device or another electric tool different from the self-moving device. The self-moving device includes an accommodating cavity provided with an inlet and configured to accommodate the energy module and a protective cover configured to operably block the inlet. The self-moving device further includes a drainage system configured to drain water to prevent water from entering the accommodating cavity.

Abstract: A chain saw includes a housing, a sprocket wheel which is provided in the housing for driving a saw chain, and a chain guide for guiding the movement of the saw chain. The chain guide extends out longitudinally from the housing and is movable longitudinally relative to the housing. The chain saw includes a chain tensioning device. The chain tensioning device comprises a driven member arranged on the chain guide, a driving member which drives the driven member to move the chain guide longitudinally, a rotating device rotating the driving member, a clutch device arranged between the rotating device and the driving member, and an elastic component which is disposed between the rotating device and the clutch device. The chain tensioning device presses the chain guide while it tensioning the saw chain. Thus it prevents effectively the chain guide from loosing after the saw chain is tensioned.

Abstract: A chain saw includes a housing, a sprocket wheel which is provided in the housing for driving a saw chain, and a chain guide for guiding the movement of the saw chain. The chain guide extends out longitudinally from the housing and is movable longitudinally relative to the housing. The chain saw includes a chain tensioning device. The chain tensioning device comprises a driven member arranged on the chain guide and a driving member which drives the driven member to move the chain guide longitudinally and a rotating device rotating the driving member. A stepless clutch device is arranged between the rotating device and the driving member. The chain tensioning device presses the chain guide while it tensioning the saw chain. Thus it prevents effectively the chain guide from loosing after the saw chain is tensioned. The operation of the chain tensioning device is labor-saving. The chain tensioning device has a stable structure and it is hard to be worn.

Abstract: A chain saw includes a housing, a sprocket wheel which is provided in the housing for driving a saw chain, and a chain guide for guiding the movement of the saw chain. The chain guide extends out longitudinally from the housing and is movable longitudinally relative to the housing. The chain saw includes a chain tensioning device. The chain tensioning device comprises a driven member arranged on the chain guide and a driving member which drives the driven member to move the chain guide longitudinally and a rotating device rotating the driving member. A stepless clutch device is arranged between the rotating device and the driving member. The chain tensioning device presses the chain guide while it tensioning the saw chain. Thus it prevents effectively the chain guide from loosing after the saw chain is tensioned. The operation of the chain tensioning device is labour-saving. The chain tensioning device has a stable structure and it is hard to be worn.