Driver

A driver including a pressure chamber, a striking portion actuated in a direction of striking a fastener when compressed gas is supplied to the pressure chamber, an operation member actuated when a worker applies an operation force to the operation member, and a contact member actuated when the worker brings the contact member into contact with a workpiece,

• the driver having
• a first mode in which, when the operation member is actuated in a state where the contact member has been actuated, the compressed gas is supplied to the pressure chamber and the striking portion is actuated, and
• a second mode in which, when the contact member is actuated in a state where the operation member has been actuated, the compressed gas is supplied to the pressure chamber and the striking portion is actuated,
• the driver comprising:
• a passage for supplying the compressed gas to the pressure chamber;
• a valve body configured to be actuated and stopped so as to open and close the passage;
• a control chamber configured to actuate and stop the valve body according to a pressure of the compressed gas;
• a first ventilation passage which is connected to the control chamber and through which the compressed gas passes;
• a second ventilation passage which is connected to the control chamber and is disposed in parallel to the first ventilation passage and through which the compressed gas passes;
• and
• an opening/closing mechanism configured to open and close each of the first ventilation passage and the second ventilation passage,
• wherein the opening/closing mechanism has
• a first state in which the first ventilation passage is opened and the second ventilation passage is closed,
• a second state in which, the first ventilation passage is closed and the second ventilation passage is opened, and
• a third state in which, the first ventilation passage is closed and the second ventilation passage is closed,
• wherein the opening/closing mechanism is in the first state when the driver is in the first mode,
• wherein the opening/closing mechanism is in the second state when the driver is in the second mode and the contact member is actuated within a predetermined time from when the operation member is actuated, so that the compressed gas is supplied to the pressure chamber through the second ventilation passage and the striking portion is actuated, and
• wherein the opening/closing mechanism is in the third state when the driver is in the second mode and the predetermined time has elapsed from when the operation member is actuated, so that the compressed gas is not supplied to the pressure chamber.