A fastener driving apparatus includes a power source, a control circuit, a motor, a first cylinder, a first piston, a linear motion converter, a second cylinder, a second piston, an anvil, a valve arrangement and at least one sensor. During a compression stroke, the first piston is configured to com
A fastener driving apparatus includes a power source, a control circuit, a motor, a first cylinder, a first piston, a linear motion converter, a second cylinder, a second piston, an anvil, a valve arrangement and at least one sensor. During a compression stroke, the first piston is configured to compress gas in a first cylinder to a predetermined pressure. At the predetermined pressure, the valve arrangement assumes an open position for communicating the compressed gas to the second cylinder, thereby causing the second piston to move linearly and enabling the anvil to drive the fastener into the workpiece. During a return stroke, at a predetermined position of the first piston in the first cylinder, the valve arrangement assumes the open position for communicating a vacuum created in the first cylinder to the second cylinder and thereby causing the second piston and the anvil to retract to their initial positions.
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1. A fastener driving apparatus for driving a fastener into a workpiece, the fastener driving apparatus comprising: a power source;a control circuit electrically coupled to the power source;a motor electrically coupled to the power source and responsive to the control circuit;a first cylinder;a firs
1. A fastener driving apparatus for driving a fastener into a workpiece, the fastener driving apparatus comprising: a power source;a control circuit electrically coupled to the power source;a motor electrically coupled to the power source and responsive to the control circuit;a first cylinder;a first piston reciprocally movable within the first cylinder to execute a compression stroke and a return stroke in an operation cycle of driving the fastener into the workpiece, the first piston defining a gas chamber within the first cylinder, the gas chamber capable of accommodating gas therein;a linear motion converter driven by the motor and operationally coupled to the first piston for reciprocally moving the first piston within the first cylinder;a second cylinder pneumatically connected to the first cylinder;a second piston reciprocally movable within the second cylinder;an anvil coupled to the second piston, the anvil capable of striking the fastener to drive the fastener into the workpiece;a valve arrangement operationally disposed between the first cylinder and the second cylinder for pneumatically connecting the first cylinder and the second cylinder, the valve arrangement configured to define a gas passageway between the first cylinder and the second cylinder in an open position and blocking the gas passageway in a closed position; andat least one sensor electrically coupled to the control circuit, the at least one sensor configured to detect at least one position of the operation cycle and communicate the detected position of the operation cycle to the control circuit,wherein during the compression stroke, the first piston is configured to move towards a top dead center of the first cylinder for compressing the gas in the gas chamber, the valve arrangement assuming the open position for communicating the compressed gas to the second cylinder causing the second piston to move linearly and enabling the anvil to drive the fastener into the workpiece; andwherein during the return stroke the valve arrangement assumes the closed position and the first piston is configured to move towards a bottom dead center of the first cylinder thereby creating a vacuum in the first cylinder between the top dead center of the first cylinder and the first piston; andwherein at a predetermined position of the first piston during the return stroke the valve arrangement assumes the open position, thereby communicating the vacuum created in the first cylinder to the second cylinder and causing the second piston and the anvil to retract to initial positions of the second piston and the anvil; andwherein during the return stroke, based on the at least one detected position by the at least one sensor, the control circuit is configured to disconnect the power source from the motor to stop the operation cycle. 2. The fastener driving apparatus of claim 1, wherein the power source is a rechargeable battery. 3. The fastener driving apparatus of claim 1, wherein the linear motion converter comprises a crankshaft mechanism. 4. The fastener driving apparatus of claim 1, wherein in the open position of the valve arrangement, a compression valve has a flow coefficient greater than one. 5. The fastener driving apparatus of claim 1, wherein during the compression stroke of the first piston the gas in the gas chamber is compressed to the predetermined pressure at a compression exponent greater than 1.05. 6. The fastener driving apparatus of claim 1, wherein the valve arrangement comprises a valve solenoid. 7. The fastener driving apparatus of claim 1, wherein a valve is adapted to allow atmospheric air to flow into the gas chamber after the vacuum has been communicated to from the first cylinder to the second cylinder. 8. The fastener driving apparatus of claim 7 further comprising an actuation member disposed on a body portion of the fastener driving apparatus for actuating the valve to allow the atmospheric air to flow into the gas chamber. 9. The fastener driving apparatus of claim 1, wherein volume of the gas passageway is less than about 15% of volume of the first cylinder. 10. The fastener driving apparatus of claim 1, further comprising a coupling member coupled between the motor and the valve arrangement, the coupling member actuated by the rotation of the motor for actuating the valve arrangement to: assume the open position for communicating the compressed gas to the second cylinder during the compression stroke;assume the closed position for creating a vacuum in the first cylinder between the top dead center of the first cylinder and the first piston during the return stroke; andassume the open position for communicating the vacuum from the first cylinder to the second cylinder during the return stroke. 11. The fastener driving apparatus of claim 1, wherein the control circuit is further configured to actuate the valve arrangement to assume the closed position after the vacuum created in the first cylinder is communicated to the second cylinder. 12. The fastener driving apparatus of claim 1, wherein the valve arrangement comprises a pneumatic valve and a valve solenoid for actuating the pneumatic valve, the valve solenoid controlled by the control circuit. 13. The fastener driving apparatus of claim 1, wherein the valve arrangement comprises a vent opening for releasing gas from the second cylinder to atmosphere in the closed position of valve arrangement. 14. A fastener driving apparatus for driving a fastener into a workpiece, the fastener driving apparatus comprising: a power source;a control circuit electrically coupled to the power source;a motor electrically coupled to the power source and responsive to the control circuit;a first cylinder;a first piston reciprocally movable within the first cylinder to execute a compression stroke and a return stroke in an operation cycle of driving the fastener into the workpiece, the first piston defining a gas chamber within the first cylinder, the gas chamber capable of accommodating gas therein;a linear motion converter driven by the motor and operationally coupled to the first piston for reciprocally moving the first piston within the first cylinder;a second cylinder pneumatically connected to the first cylinder;a second piston reciprocally movable within the second cylinder;an anvil coupled to the second piston, the anvil capable of striking the fastener to drive the fastener into the workpiece;a valve arrangement operationally disposed between the first cylinder and the second cylinder for pneumatically connecting the first cylinder and the second cylinder, the valve arrangement configured to define a gas passageway between the first cylinder and the second cylinder in an open position and blocking the gas passageway in a closed position; andat least one sensor electrically coupled to the control circuit, the at least one sensor configured to detect at least one position of the operation cycle and communicate the detected position of the operation cycle to the control circuit,wherein during the compression stroke, the first piston is configured to move towards a top dead center of the first cylinder for compressing the gas in the gas chamber, the valve arrangement assuming the open position for communicating the compressed gas to the second cylinder causing the second piston to move linearly from a first position to a second position and enabling the anvil to move from a first position to a second position to drive the fastener into the workpiece; andwherein during the return stroke the first piston is configured to move towards a bottom dead center of the first cylinder, thereby creating a vacuum in the gas chamber at the top of the first cylinder,wherein said valve arrangement assumes an open position during at least a portion of the return stroke of the first piston, thereby communicating said vacuum through said valve arrangement to the second cylinder, which vacuum causes the second piston to move linearly from said second position to said first position and the anvil to move from said second position to said first position;and wherein during the return stroke, based on the at least one detected position by the at least one sensor, the control circuit is configured to disconnect the power source from the motor to stop the operation cycle. 15. The fastener driving apparatus of claim 1, wherein the second cylinder further comprises a magnet disposed on a top plate thereof, and the anvil comprises a ferrous material. 16. The fastener driving apparatus of claim 14, wherein the second cylinder further comprises a magnet disposed on a top plate thereof, and the anvil comprises a ferrous material. 17. A fastener driving apparatus for driving a fastener into a workpiece, the fastener driving apparatus comprising: a power source;a control circuit electrically coupled to the power source;a motor electrically coupled to the power source and responsive to the control circuit;a first cylinder;a first piston reciprocally movable within the first cylinder to execute a compression stroke and a return stroke in an operation cycle of driving the fastener into the workpiece, the first piston defining a gas chamber within the first cylinder, the gas chamber capable of accommodating gas therein;a linear motion converter driven by the motor and operationally coupled to the first piston for reciprocally moving the first piston within the first cylinder;a second cylinder pneumatically connected to the first cylinder;a second piston reciprocally movable within the second cylinder;an anvil coupled to the second piston, the anvil capable of striking the fastener to drive the fastener into the workpiece;a valve arrangement operationally disposed between the first cylinder and the second cylinder for pneumatically connecting the first cylinder and the second cylinder, the valve arrangement configured to define a gas passageway between the first cylinder and the second cylinder in an open position and blocking the gas passageway in a closed position; andat least one sensor electrically coupled to the control circuit, the at least one sensor configured to detect at least one position of the operation cycle and communicate the detected position of the operation cycle to the control circuit,wherein during the compression stroke, the first piston is configured to move towards a top dead center of the first cylinder for compressing the gas in the gas chamber, the valve arrangement assuming the open position for communicating the compressed gas to the second cylinder causing the second piston to move linearly from a first position to a second position and enabling the anvil to move from a first position to a second position to drive the fastener into the workpiece; andwherein during the return stroke the first piston is configured to move towards a bottom dead center of the first cylinder, thereby creating a vacuum in the gas chamber at the top of the first cylinder,wherein said valve arrangement assumes an open position during at least a portion of the return stroke of the first piston, thereby communicating said vacuum through said valve arrangement to the second cylinder, which vacuum causes the second piston to move linearly from said second position to said first position and the anvil to move from said second position to said first position; andwherein based on the at least one detected position by the at least one sensor, the control circuit is configured to stop the operation cycle.
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