Driving tools

1 . A fastener driving tool comprising:

a main motor configured to generate a driving force to drive a driver;

a main body housing configured to accommodate the main motor;

a sub-motor configured to be driven independently from the main motor; and

a fan that is mounted on an output shaft of the sub-motor, wherein the sub motor is utilized to provide a cooling function to the fastener driving tool.

2 . The driving tool according to claim 1 , further comprising a controller configured to transmit a drive signal for driving the sub-motor even when the main motor is stopped.

3 . The driving tool according to claim 1 , wherein the sub-motor is driven longer than a driving time of the main motor when the driver is driven for one cycle of driving operation.

4 . The driving tool according to claim 1 , further comprising a magazine configured to accommodate driven members, and

a driver guide configured to receive a driven member supplied from the magazine and configured to guide the driver in a movable manner,

wherein the sub-motor is located in between the main motor and the magazine.

5 . The driving tool according to claim 4 , further comprising a feed claw configured to load the driven members from the magazine into the driver guide, and

a solenoid configured to move the feed claw in a direction opposite to a feeding direction,

wherein the solenoid is located in between the main motor and the magazine.

6 . The driving tool according to claim 5 , wherein the solenoid has a tubular holder for accommodating a coil, and

the main body housing has a solenoid cooling passage flowing air between the coil and an inner peripheral surface of the holder by driving the sub-motor.

7 . The driving tool according to claim 1 , wherein the output shaft of the sub-motor is configured to be extendable in a direction intersecting an extending direction of an output shaft of the main motor and a driving direction of a driven member.

8 . The driving tool according to claim 1 , wherein the main body housing has a motor cooling passage for flowing air to the main motor by driving the sub-motor.

9 . The driving tool according to claim 1 , further comprising a controller configured to transmit a drive signal to the main motor and the sub-motor, and

wherein the main body housing has a controller cooling passage for flowing air to the controller by driving the sub-motor.

10 . The driving tool according to claim 1 , wherein the main body housing further includes

a plurality of cooling passages for flowing air by driving the sub-motor, and

an exhaust port for discharging the air flowing through the plurality of cooling passages,

wherein the exhaust port is common to the plurality of cooling passages.

11 . The driving tool according to claim 1 , further comprising a piston that is connected to the driver, and

a cylinder in which the piston is movably provided,

wherein the main motor moves the driver back in a counter-driving direction to increase gas pressure in the cylinder.

12 . A fastener driving tool comprising:

a main motor configured to generate a driving force to drive a driver;

a main body housing configured to accommodate the main motor;

a sub-motor driven independently from the main motor to generate a rotational force to rotate a fan, the sub-motor having an output shaft on which the fan is mountable, wherein the sub motor is utilized to provide a cooling function to the fastener driving tool; and

a controller configured to transmit a drive signal for driving the sub-motor when the main motor stops driving.

13 . The driving tool of claim 12 , wherein the main body housing further has a plurality of cooling passages and an exhaust port for discharging air flowing through the plurality of passages.

14 . The driving tool of claim 12 , wherein the fan is configured to rotate integrally with the output shaft.

15 . The driving tool of claim 12 , further comprising a planetary reduction mechanism configured to decelerate a rotary drive of the output shaft.

16 . The driving tool of claim 15 , wherein the planetary reduction mechanism has a bearing to rotatably support the output shaft.

17 . The driving tool of claim 15 , wherein the planetary reduction mechanism has at least three gear trains.

18 . The driving tool of claim 12 , further comprising a mechanism case having a main motor housing chamber, a gear housing chamber, a lifter housing chamber, a solenoid housing chamber, a sub-motor housing chamber, and a communication passage.

19 . The driving tool of claim 12 , further comprising a solenoid, wherein the solenoid has a tubular holder for accommodating a coil.

20 . The driving tool of claim 19 , wherein the main body housing has a solenoid cooling passage for flowing air between the coil and the tubular holder.