Patent ID: 12186868

BEST MODE FOR CARRYING OUT THE INVENTION

Some driving devices according to embodiments of the present invention will be explained with reference to the drawings.

First Embodiment

A driving device10shown inFIGS.1and2includes a body11, a striking portion12, an injecting portion13, a power supply portion14, an electrical motor15, a speed reducer16, a power transmitting portion17, a pressure room18, a feeding portion19, a magazine20and a control portion38. The body11includes a housing21, a handle22protruding from the housing21, and a mounting portion23connected to an end of the handle22, the end being opposite to the housing21.

A head cover24is fixed to the housing21. The cylinder25is housed inside the housing21. An accumulator70is arranged inside the housing21and inside the head cover24. The accumulator70is fixed to the cylinder25. The pressure room18is formed over inside of the cylinder25and inside of the accumulator70.

The striking portion12includes a piston26and a driver blade27. The piston26and the driver blade27may be a unified component. The piston26and the driver blade27may be different components, and the piston26and the driver blade27may be fixed to each other. The piston26is arranged inside the cylinder25. The striking portion12is reciprocable in a direction along a center line A1of the cylinder. The striking portion12is allowed to move for striking the fastener. The housing21indirectly support the striking portion12through the cylinder25.

The pressure room18is filled with compressed fluid. As the compressed gas, air or inert gas is allowed to be used. Examples of the inert gas include nitrogen gas and rare gas. In the present specification, an example of the pressure room18filled with the air will be explained. The piston26receives an air pressure of the pressure room18, and the striking portion12is biased in a first direction B1by the air pressure. A bumper made of a synthetic rubber is arranged inside the cylinder25. The driver blade27includes a rack46. The rack46is made of protrusions that are arranged in the moving direction to sandwich a gap therebetween.

The injecting portion13is attached to the housing21. The injecting portion13includes an injecting path34shown inFIG.5. The injecting path34is a hole or a space extending in the direction along the center line A1. The driver blade27is movable inside the injecting path34. The injecting portion13guides the moving direction of the driver blade27to be along the center line A1, and determines a nail driving-in direction. A push lever28is attached to the injecting portion13. The push lever28is in contact with and away from a workpiece W1to which the nail is driven in (hit).

Note thatFIGS.1and2show a state in which a tip of the push lever28is close to a surface of a wall that is one example of the workpiece W1. A push lever switch is arranged in the injecting portion13. The push lever switch not illustrated detects whether the push lever28is in contact with or away from the workpiece W1, and outputs a signal. The signal output from the push lever switch is input to the control portion38.

The magazine20includes a drum portion29and a connecting portion30. An outer appearance of the drum portion29is cylindrical. The drum portion is hollow, and the drum portion29is allowed to house the nail31. The drum portion29is supported to the mounting portion23by a bracket69. As shown inFIG.1, the magazine20protrudes from the injecting portion13in the direction crossing the center line A1.

As shown inFIG.3, the plurality of nails31are connected to one another by a joint wire32, and the plurality of nails31are arranged inside the drum portion29while being wound spirally, in other words, in the roll form. The connecting portion30is connected to the drum portion29, and the connecting portion30is fixed to the injecting portion13. The connecting portion30includes a feeding path33, and the feeding path33communicates with inside of the drum portion29and the injecting path34. The feeding path33guides the nail31from the inside of the drum portion29to the injecting path34.

The electrical motor15is arranged inside the housing21, and is supported by the housing21. The electrical motor15is a brushless motor. A center line A2that is a rotary center of the rotary shaft35of the electrical motor15is in parallel to the center line A1. In other words, the center line A2of the electrical motor15is arranged to cross a plane orthogonal to the center line A1of the cylinder. The electrical motor15is arranged to be adjacent to the cylinder25. As shown inFIG.1, the center line A2of the electrical motor15is closer to the handle22than the center line A1. Note that the center line A2of the electrical motor15may cross the center line A1at an angle that is different from 90 degrees. The speed reducer16is arranged inside the housing21. The speed reducer16and the power transmitting portion17are arranged between the electrical motor15and the injecting portion13in the direction along the center line A2. The speed reducer16is arranged between the electrical motor15and the power transmitting portion17in the direction along the center line A2. The speed reducer16includes an input element, a planet gear mechanism and an output element36. The input element is connected to the rotary shaft35. The speed reducer16reduces a rotary speed of the output element36to be lower than a rotary speed of the input element, and amplifies a rotary force, that is a torque.

The power supply portion14is a direct-current power supply allowed to supply power to the electrical motor15. The power supply portion14is a battery pack including a container case and a plurality of battery cells contained in the container case. The battery cell is a dischargeable secondary battery. As the battery cell, a publicly-known battery cell such as a lithium ion battery, a nickel hydrogen battery, a lithium ion polymer battery and a nickel cadmium battery can be optionally used.

As shown inFIG.1, the handle22protrudes from an outer surface of the housing21in the direction crossing the center line A1. The handle22has a tubular or rod shape. The direction of the protrusion of the handle22from the outer surface of the housing21and the direction of protrusion of the magazine20from the injecting portion13are substantially the same as each other.FIG.1shows an example of a first virtual plane expanding along the center line A1that is the moving direction of the striking portion12and along the direction of protrusion of the handle22from the housing21. The first virtual plane can be defined as a front view of the driving device10. A structure of the front view of the driving device10is illustrated inFIG.1.

The trigger37is attached to the handle22. The trigger37is movable relative to the handle22. A user can grab the handle22with his/her hand68as shown inFIG.4, and apply/release an operational force to/from the trigger37by using his/her finger. The trigger37is arranged between a center position of the handle22and the outer surface of the housing21in the direction of the protrusion of the handle22from the housing21.

The control portion38is arranged inside the mounting portion23. The control portion38is a microcomputer including a circuit board, an input/output port, a storage circuit, a calculation processing unit and others. A circuit board39is arranged inside the housing21, and a trigger switch is arranged inside the handle22. The trigger switch detects whether the operational force is applied to or released from the trigger37, and outputs a signal. The signal that is output from the trigger switch is input to the control portion38. An inverter circuit is arranged in the circuit board39. The inverter circuit is arranged in an electrical circuit between the battery cell of the power supply portion14and the electrical motor15. The inverter circuit includes a plurality of switching elements.

Further, a position detecting sensor and a phase detecting sensor are arranged inside the housing21. The position detecting sensor detects a position of the striking portion12in the direction along the center line A1, and outputs a signal. The phase detecting sensor detects a phase of the electrical motor15in the rotary direction, and outputs a signal. The control portion38processes the signal output from the trigger switch, the signal output from the push lever switch, the signal output from the position detecting sensor and the signal output from the phase detecting sensor, and controls the inverter circuit. The control portion38is allowed to control the rotation and the stoppage of the electrical motor15, the rotary speed of the electrical motor15, and the rotary direction of the electrical motor15.

An internal structure of the housing21will be explained with reference toFIG.2.FIG.2is a cross-sectional view taken along a line II-II ofFIG.1. For convenience, the power transmitting portion17is illustrated with a solid line, and a pin wheel40is illustrated with a dashed double-dotted line.

The power transmitting portion17and the pin wheel40are arranged inside the housing21. The power transmitting portion17and the pin wheel40include a function of transmitting the power of the electrical motor15to the striking portion12. The power transmitting portion17includes a driving bevel gear41, a driven bevel gear42, a first spur gear43, and a second spur gear44. The driving bevel gear41is fixed to the output element36of the speed reducer16. The driven bevel gear42is engaged with the driving bevel gear41. The first spur gear43is allowed to rotate together with the driven bevel gear42. The second spur gear44is engaged with the first spur gear43. The pin wheel40is allowed to rotate together with the second spur gear44, and the pin wheel40includes a plurality of pinion pins45that are arranged to sandwich a gap therebetween in the rotary direction.

By the rotation of the pin wheel40, the plurality of pinion pins45are independently engaged with or released from the rack46of the driver blade27. By the rotation of the pin wheel40and the engagement of at least one pinion pin45with the rack46, the power of the electrical motor15is transmitted to the striking portion12. Therefore, the striking portion12moves in the second direction B2to be against the air pressure of the pressure room18as shown inFIG.2. The second direction B2is opposite to the first direction B1. By the release of all pinion pines45from the rack46, the power of the electrical motor15is not transmitted to the striking portion12.

The feeding portion19is formed over the inside of the housing21and the connecting portion30as illustrated inFIG.5. The injecting portion19is a device that feeds the nail31housed in the magazine20to the injecting path34. The feeding portion19includes an engaging portion47, a feeding piston48, a feeder arm49and a feeder50. The engaging portion47protrudes from an outer circumferential surface of the output element36.

A tubular holder51is fixed to the injecting portion13. The feeding piston48is reciprocable along the direction of the protrusion of the connecting portion30from the injecting portion13. Further, the injecting portion13includes an openable injecting-portion cover13A. The injecting-portion cover13A is configured to make its side surface open, the side surface being opposite to the region with the feeder50across the feeding path33. The injecting-portion cover13A includes a reverse stop pawl13B. The reverse stop pawl13B is arranged in the feeding path33. The reverse stop pawl13B is movable relative to the injecting-portion cover13A. The reverse stop pawl13B in the feeding path33is allowed to escape from the path in which the nail31travels.

A spring52is arranged inside the holder51, and the spring52biases the feeding piston48in a direction of being away from the injecting portion13. A stopper56is attached to the holder51, and the feeding piston48that is biased by the spring52stops when being in contact with the stopper56. The feeding piston48includes an engaging portion58. By the rotation of the output element36, the engaging portion47is engaged with or released from the engaging portion58.

The feeder arm49is fixed to the feeding piston48. The feeder50is movable within a range of a predetermined angle around a support shaft57of the feeder arm49. The feeder50includes a protrusion54. A spring55is arranged between the feeder arm49and the feeder50. The spring55biases the feeder50in a direction of being close to the feeding path33.

Next, an application example of the driving device10will be explained. When detecting at least either one of the release of the operational force from the trigger37and the separation of the push lever28from the workpiece W1, the control portion38controls the inverter circuit to stop the supply of the power to the electrical motor15. Therefore, the electrical motor15stops, and the striking portion12stops at a standby position. For convenience, the standby position of the striking portion12will be explained to be in a state in which the piston26is away from the bumper. The standby position of the striking portion12is a position close to a top dead center. The top dead center of the striking portion12is a position at which the piston26is the farthest from the injecting portion13in the direction along the center line A1.

The air pressure of the pressure room18is always applied to the striking portion12, and the moving power received by the striking portion12is transmitted to the pin wheel40through the rack46. A rotary limitation mechanism arranged in the speed reducer16prevents the rotation of the output element36, and stops the striking portion12at the standby position.

When detecting that the operational force is being applied to the trigger37while the push lever28is being in contact to the workpiece W1, the control portion38controls the inverter circuit to supply the power of the power supply portion14to the electrical motor15to rotate the electrical motor15. The rotary force of the electrical motor15is transmitted to the pin wheel40through the speed reducer16, the driving bevel gear41, the driven bevel gear42, the first spur gear43and the second spur gear44.

Therefore, the striking portion12is moved in the second direction B2, in other words, is ascended. By the ascent of the striking portion12, the pressure of the pressure room18is increased. Then, by the release of all the pinion pins45from the rack46, the striking portion12is moved in the first direction B1, in other words, is descended by the pressure of the pressure room18. By the descent of the striking portion12, the driver blade27strikes one nail31in the injecting path34, and the nail31is driven in to the workpiece W1. After the nail31is driven in to the workpiece W1, the piston26collides with the bumper.

The control portion38process the signal output from the position detecting sensor, detects the position of the striking portion12in the direction of the center line A1, and detects whether the striking portion12has reached the standby position or not. When the striking portion12has reached the standby position, the control portion38stops the electrical motor15.

In the first virtual plane shown inFIG.1in the driving device10, the arrangement region of the electrical motor15and the arrangement region of the magazine20are at least partially different from each other. Specifically, in the direction along the center line A1, the arrangement region of the electrical motor15and the arrangement region of the magazine20are entirely different from each other. And, in the direction of the protrusion of the handle22and the magazine20from the housing21inFIG.1, the arrangement region of the electrical motor15and the arrangement region of the magazine20are at least partially different: each other. Specifically, the arrangement region of the electrical motor15and the arrangement region of the magazine20are entirely different from each other.

The electrical motor15, the speed reducer16and the power transmitting portion17are arranged inside the housing21, and the electrical motor15, the speed reducer16and the power transmitting portion17are arranged near the center line A2between the center line A1and the magazine20in this order from the region of the head cover24. Therefore, the heavy speed reducer16can be arranged at a connecting portion of the handle22with the housing21. And, the electrical motor15and the power transmitting portion17can be arranged on both sides of the speed reducer16in the direction along the center line A2. Therefore, a center of gravity G1of the driving device10is positioned at the connecting portion of the handle22with the housing21in the driving device10shown inFIG.1.

In a state in which the surface of the workpiece W1crosses the horizontal plane as similar to the case of the workpiece W1serving as the wall, circumstances of posture change of the driving device10by the user who is gripping the handle22with his/her hand68will be exemplified as shown inFIG.4. According to this, when the user changes the posture of the driving device10by applying the operational force to the handle22, a distance from a portion of the handle22gripped with the hand68to the center of gravity G1, that is a moment arm, can be shortened as small as possible. In other words, the operational force applied to the handle22by the user in order to change the posture of the driving device10can be reduced. Therefore, operability for lifting a tip of the push lever28and bringing the tip of the push lever28close to the workpiece W1is improved.

FIG.2shows an example of a second virtual plane being along the moving direction of the striking portion12and crossing the direction of the protrusion of the handle22from the housing21. The second virtual plane can be defined as a side surface of the driving device10.

In a direction that is substantially at a right angle with respect to the center line A1inFIG.2, an arrangement region of the electrical motor15and an arrangement region of the magazine20at least partially overlap each other. The electrical motor15, the speed reducer16and the power transmitting portion17are arranged on one side across the center line A1inFIG.2. The center of gravity G1is arranged between the center line A1and the center line A2.

Further, the electrical motor15and the speed reducer16are arranged inside the housing21. Therefore, the protrusion mechanism from the housing21can be reduced, and the contact portion between the tip of the push lever28and the workpiece W1can be easily visually observed. In this case, the workpiece W1may be any of the wall, a floor, a ceiling and others.

Next, the movement of the feeding portion19will be explained. At the moment at which the striking portion12stops at the standby position, that is the moment before the driver blade27strikes the nail31, the engaging portion47and the engaging portion58engage with each other while the output element36stops as shown inFIG.5. Therefore, the feeding piston48stops at a position at which the feeding piston is close to the injecting portion13. Further, the protrusion54of the feeder50stops in contact with the nail31at a first position in a feeding direction “C1” of the nails31. The protrusion54is positioned between the first nail31in the feeding direction C1and a second nail31in the feeding direction C1. The first nail31in the feeding direction C1is positioned at the injecting path34.

When the engaging portion47oversteps the engaging portion58as shown inFIG.6after the output element36rotates counterclockwise to cause the driver blade27to strike the nail31positioned at the injecting path34, the feeding piston48is moved in a direction D1being away from the injecting portion13by the force of the spring52. By the movement of the feeding piston48, the protrusion54is pressed against the first nail31A in the feeding direction C1among the nails31in the feeding path33, and the feeder50moves counterclockwise by a predetermined angle “θ1”.

When the protrusion54oversteps the first nail31A in the feeding direction C1, the feeder50moves clockwise by a predetermined angle “θ2” because of the bias force of the spring55. Therefore, the protrusion54enters between the first nail31A and the second nail31B as shown inFIG.7. When the protrusion54oversteps the first nail31A, note that the reverse stop pawl13B prevents other nails31from moving in an opposite direction to the feeding direction C1. The reverse stop pawl13B can move backward from the feeding path33, and does not interrupt the movement of the nail31at the time of the movement of the nail31in the feeding direction C1. Further, when the engaging portion47is engaged with the engaging portion58by the rotation of the output element36, the feeding piston48is moved in a direction D2being close to the injecting portion13to be against the force of the spring52as shown inFIG.5.

Therefore, the output element36stops while the protrusion54of the feeder50feeds the first nail31to the injecting path34in the feeding direction C1and the engaging portion47engages with the engaging portion58as shown inFIG.5. As described above, the electrical motor15has both the function of moving the striking portion12in the second direction B2and the function of moving the feeding piston48and the feeder arm49in the direction D2.

Inside the second virtual plane shown inFIG.2, the arrangement region R1of the electrical motor15and the arrangement region R2of the magazine20partially overlap each other in the direction crossing the center line A1that is the same as the moving direction of the striking portion12. Therefore, increase in a lateral width of the driving device10can be suppressed.

Second Embodiment

A power transmitting portion17in a driving device10shown inFIGS.8and9includes a third spur gear60, a fourth spur gear61, a large gear62, a driving bevel gear41, a driven bevel gear42, a first spur gear43, a second spur gear44and a pin wheel40. The third spur gear60is fixed to the rotary shaft35. As shown inFIG.10, the large gear62is annular, and is arranged while taking the center line A1as its center. An inner diameter of the large gear62is larger than an outer diameter of the cylinder25, and the large gear62is supported by the cylinder25through a bearing63. Therefore, the large gear62is rotatable around the center line A1.

The third spur gear60is meshed with the large gear62. The fourth spur gear61is meshed with the larger gear62, and the fourth spur gear61does not revolve around the center line A1. The fourth spur gear61is rotatable together with the driving bevel gear41. An arrangement region of the third spur gear60and an arrangement region of the fourth spur gear61are different from each other in a rotary direction of the large gear62.

Other configurations of the driving device10shown inFIGS.8and9are the same as those of the driving device10shown inFIGS.1and2. The driving device shown inFIGS.8and9includes the feeding portion19shown inFIG.6. Note thatFIGS.8and9show that the tip of the push lever28is close to the surface of the wall that is one example of the workpiece W1.

In the driving device10shown inFIGS.8and9, the rotary force of the electrical motor15is transmitted to the driving bevel gear41through the third spur gear60, the large gear62and the fourth spur gear61. The striking portion12shown inFIG.9moves as similar to the striking portion12shown inFIG.2.

In the driving device10, the arrangement region of the electrical motor15and the arrangement region of the cylindrical-shape magazine20are at least partially different from each other in the first virtual plane shown inFIG.8. Specifically, in the direction along the center line A1, the arrangement region of the electrical motor15and the arrangement region of the magazine20are entirely different from each other. And, in the direction of the protrusion of the handle22from the housing21inFIG.8, the arrangement region of the electrical motor15and the arrangement region of the magazine20are entirely different from each other. Further, the electrical motor15and the power transmitting mechanism17are separately arranged on both sides of the striking portion12. Therefore, when the user lifts the driving device10while gripping the handle22with the hand as shown inFIG.4, the operability for bringing the tip of the push lever28close to the workpiece W1is improved.

The electrical motor15, the speed reducer16and the power transmitting portion17are arranged inside the housing21. Further, near the center line A2between the center line A1and the magazine20inFIG.8, the electrical motor15and the power transmitting portion17are arranged in this order sequentially from a region of the head cover24. The power transmitting portion17includes the third spur gear60, the fourth spur gear61and the large gear62. The heavy third spur gear60and fourth spur gear61are arranged at the connecting portion between the handle22and the housing21.

Further, the electrical motor15, the driving bevel gear41, the driven bevel gear42, the first spur gear43, the second spur gear44and the pin wheel40can be arranged on both sides of the third spur gear60and the fourth spur gear61in the direction along the center line A1. Therefore, the center of gravity G1of the driving device10is positioned at the connecting portion between the handle22and the housing21shown inFIG.8. Therefore, when the user changes the posture of the driving device10by applying the operational force to the handle22, the necessary operational force can be reduced.

Further, inside the second virtual plane shown inFIG.9, the arrangement region R1of the electrical motor15and the arrangement region R2of the magazine20partially overlap each other in the direction crossing the center line A1that is along the moving direction of the striking portion12. Therefore, increase in a lateral width of the driving device10can be suppressed.

Further, inFIG.9, the center line A1is arranged between a region of the electrical motor15and the third spur gear60and a region of the fourth spur gear61, the driving bevel gear41and the driven bevel gear42. The center of gravity G1is arranged to overlap the center line A1. Therefore, when the user brings the tip of the push lever28to contact with the workpiece W1while lifting the driving device10as shown inFIG.4, tilt of the driving device10toward either the right side or the left side can be suppressed, and the posture of the driving device10can be easily kept.

Further, the electrical motor15is arranged inside the housing21. Therefore, the protrusion mechanism from the housing21can be reduced, and the contact portion between the tip of the push lever28and the workpiece W1can be easily visually observed. In this case, the workpiece W1is not limited to a portion such as the wall, a floor, a ceiling or others.

Modification Example

FIG.11is a change example of a part of the driving device10shown inFIG.9. A dedicated electrical motor64that drives the fourth spur gear61is arranged. The electrical motor64is arranged inside the housing21, and a rotary shaft65of the electrical motor64is connected to the fourth spur gear61. The control portion38controls the rotation and the stoppage of the electrical motor15. A center line A3of the electrical motor64is in parallel to the center line A1and the center line A2. The center line A1is arranged between the center line A2and the center line A3. Both the rotary force of the electrical motor15and a rotary force of the electrical motor64are transmitted to the fourth spur gear61. Other configurations of the driving device10shown inFIG.11are the same as the configurations of the driving device10shown inFIGS.8and9, and can provide the same effect.

Further, since the driving device includes the plurality of electrical motors15and64, a power of each electrical motor can be reduced. Therefore, each electrical motor can be downsized, and a lateral width of the housing21can be suppressed.

And, the small torque for driving the striking portion12may be acceptable. For example, this case is applied immediately after the striking portion12stopping at the bottom dead center moves toward the top dead center or applied when the engagement between the striking portion12and the pin wheel40is released, or others. In such a case, only either one of the electrical motors15and64can be driven.

On the other hand, a large torque is often necessary for driving the striking portion12. This case is applied when, for example, the striking portion12is close to the top dead center. In such a case, both the electrical motors15and64can be driven.

Third Embodiment

A body11of a driving device10shown inFIGS.12and13includes a housing21, a mounting portion23, a handle22and a motor case66. The motor case66is connected to the mounting portion23and the housing21. The motor case66is tubular. A direction of protrusion of the motor case66from the housing21is substantially the same as the direction of protrusion of the handle22from the housing21. The electrical motor15and the speed reducer16are arranged inside the motor case66. The rotary center of the rotary shaft of the electrical motor15is a center line A4. The speed reducer16is arranged while taking the center line A4as its center. The speed reducer16is arranged between the electrical motor15and the housing21in a direction along the center line A4.FIG.12shows an example in which the center line A1and the center line A4cross each other at an angle that is different from 90 degrees. In other words, the center line A4of the electrical motor15crosses a plane orthogonal to the center line A1of the cylinder. Note thatFIG.12shows a state in which the tip of the push lever28is close to the surface of the wall that is one example of the workpiece W1.

A power transmitting portion67is arranged inside the housing21. The power transmitting portion67includes, for example, a gear string. The output element of the speed reducer16is connected to the pin wheel40through the power transmitting portion67. The control portion38controls the rotation, the stoppage and the rotary speed of the electrical motor15. The rotary force of the electrical motor15is transmitted to the pin wheel40through the speed reduced16and the power transmitting portion67. By the rotation of the pin wheel40, the striking portion12shown inFIG.12moves as similar to the striking portion12shown inFIG.2.

The driving device10shown inFIGS.12and13includes the feeding portion19shown inFIG.5. A part of the power transmitted from the electrical1motor15to the power transmitting portion67is transmitted to the feeding portion19through the output element36. The nail31inside the cylindrical-shape magazine20is fed to the injecting path34by the feeding portion19. The driver blade27strikes the nail3fed to the injecting path34.

In the driving device10, the arrangement region of the electrical motor15and the arrangement region of the magazine20are at least partially different from each other in the first virtual plane shown inFIG.12. Specifically, in the direction along the center line A1representing the moving direction of the striking portion12, the arrangement region of the electrical motor15and the arrangement region of the magazine20are entirely different from each other. And, in the direction along the center line A1, the motor case66is arranged between the handle22and the magazine20. The electrical motor15and the speed reducer16are arranged inside the motor case66. Therefore, when the user lifts the driving device10while gripping the handle22with the hand68as shown inFIG.4, the operability for bringing the tip of the push lever28close to the workpiece W1is improved.

A portion of the motor case66, the portion being close to the mounting portion23, is arranged to be upper than a portion of the same, the portion being close to the housing21. The electrical motor15, the speed reducer16and the power transmitting portion67are arranged inside the housing21. Therefore, the center of gravity G1of the driving device10is arranged between the connecting portion between the handle22and the housing21and the connecting portion between the motor case66and the housing21in the direction along the center line A1.

Therefore, when the user changes the posture of the driving device10by applying the operational force to the handle22, the necessary operational force can be reduced. Further, the electrical motor15and the speed reducer16are arranged between the handle22and the magazine20. Therefore, the lateral width of the housing21can be suppressed at the minimum, and the driving-in work to the corner can be easily performed. In other words, the driving-in work to the corner can be easier.

InFIG.13in which a right side of the driving device10is viewed, the arrangement region of the drum portion29of the magazine20, the arrangement region of the electrical motor15and the arrangement region of the handle22are at least partially overlap one another. Therefore, the center of gravity G1of the driving device10is positioned inside the arrangement region of the handle22. When the user brings the tip of the push lever28to contact with the workpiece W1, tilt of the driving device10toward either the right side or the left side in the user's view can be suppressed, and the posture of the driving device10can be easily kept.

Reference Example

A driving device10shown inFIGS.14and15is a reference example. InFIG.14in which a front side of the driving device10is viewed, the arrangement region of the drum portion29of the magazine20and the arrangement region of the electrical motor15at least partially overlap each other. InFIG.14, the center line A1and the center line A4cross each other at an angle that is substantially 90 degrees. Further, inFIG.15in which a right side of the driving device10ofFIG.14is viewed, the arrangement region of the drum portion29of the magazine20and the arrangement region of the electrical motor15are entirely different from each other. The connecting portion30shown inFIG.15tilts from the center line A4. Other configurations of the driving device10shown inFIGS.14and15are the same as other configurations of the driving device10shown inFIGS.12and13.

Examples of technical meaning of the matters disclosed in some embodiments are as follows: The driving device10is one example of the driving device. The striking portion12is one example of the striking portion. The nail31is one example of the fastener. The magazine20is one example of the magazine. The injecting portion13is one example of the injecting portion. The first direction B1is one example of the first direction, and the second direction B2is one example of the second direction. The pressure room18is one example of the pressure room and the first bias portion. Teach of the electrical motors15and64is one example of the electrical motor. The housing21is one example of the housing.

FIGS.1,8and12show one example of the first virtual plane.FIGS.2and9show one example of the second virtual plane. The handle22is one example of the handle. The direction along the center line A1or the direction parallel to the center line A1is one example of the moving direction of the striking portion. Each of the left and right direction inFIG.2and the left and right direction inFIG.9is one example of the direction crossing the moving direction of the striking portion. Each of the rotary shafts35and65is one example of the rotary shaft. Each of the center lines A2and A3is one example of the rotary center line.

The electrical motor15is one example of the first motor, and the electrical motor64is one example of the second motor. The motor case66is one example of the motor case. The feeding portion19is one example of the feeding mechanism.

The driving device is not limited to the foregoing embodiments, and various modifications can be made within the scope of the present invention. For example, the workpiece to which the fastener is driven in may be any of a wall, a floor, a ceiling, a pillar, a beam and others. In a state in which the push lever is in contact with the workpiece, the moving direction of the striking portion may be the horizontal direction, the vertical direction, or between the horizontal direction and the vertical direction. The driving device includes the one having the injecting portion and the housing that are unified. The driving device includes the one having the injecting portion and the housing that are made of different members and fixed to each other.

The first bias portion is not only the one moving the striking portion by using the pressure of the compressed fluid but also may be a sold spring, a magnetic spring or a synthetic rubber. In the sold spring, the striking portion is moved by, for example, an elastic restoring force of a metallic spring. In the magnetic spring, the striking portion is moved by a magnetic attraction force or repulsive force of a magnet. In the synthetic rubber, the striking portion is moved by, for example, an elastic restoring force.

The electrical motor may be either a brushless motor (inverter motor) or a brushed motor. The housing may be any of the ones made of metal, synthetic resin, or metal coated with synthetic rubber or synthetic resin. The housing is tubular, and includes a casing and a body. The handle may have any of a tubular shape, a rod shape, a shaft shape and others.

The feeding portion may be defined as the feeding mechanism that is movable to feed the fastener to the injecting portion or the moving member that is movable to feed the fastener to the injecting portion. The feeding portion includes the element that is rotatable by the power of the electrical motor, the element that is linearly movable by the power of the electrical motor, and the element that is in contact with the fastener and movable in the direction of feeding the fastener. The element that is rotatable by the power of the electrical motor is, for example, a gear or an arm. The element that is linearly movable by the power of the electrical motor is, for example, a piston or a plunger. The element that is movable in the direction of feeding the fastener is, for example, a feeder, a feed pawl and an engaging member. The feeding portion is configured to be moved by the electrical motor moving the striking portion. However, an actuator may be separately arranged. For example, a dedicated electrical motor having a rotary shaft or a linearly-movable dedicated solenoid are arranged. However, in all the cases, in order to make the timing adjustment easy, the feeding portion is desirably controlled by the control portion that controls the electrical motor moving the striking portion.

The power transmitting portion may include any one or a plurality of transmitting devices that are a gear string that is a meshing-drive device, a pulley and a belt that are a wrapping-drive transmitting device and a friction roller that is a friction-drive device.

The power supply portion that supplies the power to the electrical motor may be either a direct-current power supply or an alternate-current power supply. The direct-current power supply may be either a secondary battery or a primary battery. The alternate-current power supply may not be arranged in the mounting portion, and the mounting portion and the alternate-current power supply may be connected to each other by a power cable. The fastener may be either a nail with a head portion or a nail without the head portion.

The virtual planes and the center lines explained in the embodiments do not physically exist, and are merely imaginary planes and imaginary lines in engineering. The first virtual plane may be not only the front view of the driving device but also a back view of the same. In other words, a plurality of the first virtual planes can be assumed. However, since the virtual planes are in parallel to one another, the relation between the arrangement region of the electrical motor and the arrangement region of the magazine in each virtual plane is the same as one another. Further, the second virtual plane may be not only the planar view of the driving device but also a bottom view of the same. In other words, a plurality of the second virtual planes can be assumed. However, since the virtual planes are in parallel to one another, the relation between the arrangement region of the electrical motor and the arrangement region of the magazine in each virtual plane is the same as one another. The position of the piston at the farthest from the injecting portion in the direction along the center line can be defined as the top dead center of the striking portion. The position of the piston at the closest to the injecting portion in the direction along the center line can be defined as the bottom dead center of the striking portion.

Further, the phrase describing that “the rotary shaft extends in parallel to the moving direction of the striking portion” also includes a case in which the extending direction of the rotary shaft and the moving direction of the striking portion are slightly different from each other due to tolerance in mechanical processing or others, attachment error of components, or others. Still further, the expression of “the cylindrical-shape magazine” describes the outer appearance shape of the magazine, and describes that the magazine is hollow.

Still further, the phrase describing that “the first motor and the second motor are arranged to sandwich the striking portion therebetween” does not mean that the first motor and the second motor are not in contact with the striking portion. There is a space between the striking portion and the first and second motors, and the striking portion is movable. Still further, the striking portion is not in contact with both the first and second motors even when moving.

EXPLANATION OF REFERENCE CHARACTERS

10. . . driving device,12. . . striking portion,13. . . injecting portion,15and64. . . electrical motor,18. . . pressure room,19. . . feeding portion,20. . . magazine,21. . . housing,22. . . handle,31. . . nail,35and65. . . rotary shaft,66. . . motor case, A2and A3. . . center line, B1. . . first direction, B2. . . second direction