Automated dressing unit for a chain saw

A chain saw including a power shaft that rotates in a power source provided in a main body and a saw chain that is driven by the power shaft, the chain saw including:

• a dressing unit configured to perform dressing of the saw chain, wherein the dressing unit comprises:
• a dressing member configured to perform dressing of the saw chain by contact with the saw chain that is in a driven state;
• wherein the chain saw further includes a controller configured to, in a case that the dressing unit is operated, perform a control different from a case that the dressing unit is not operated, and
• a detection unit in which a first state in which a position of the dressing member is on a side away from the saw chain according to an operation by an operator and a second state in which a position of the dressing member is on a side close to the saw chain are set, and in which a transition of the dressing member from the first state to the second state, or a change from a state in which the transition from the first state to the second state according to an operation by an operator is not allowed to a state in which the transition is allowed, is detected,
• wherein, when the detection is performed by the detection unit, the controller determines that the dressing unit is operated,
• wherein the controller is connected to the detection unit and controls rotation of the power shaft based on a detection result of the detection unit,
• a rotational speed adjusting unit configured to control a rotational speed of the power shaft according to an operation by an operator,
• wherein, when the detection unit detects that the dressing member has transitioned from the first state to the second state or when the detection unit detects that the state in which the transition of the dressing member from the first state to the second state is not allowed has changed to the state in which the transition is allowed, the controller performs control such that a rotational speed of the power shaft is reduced irrespective of an operation of the rotational speed adjusting unit.