3  EP 3 800 011 A1 4  (First embodiment) [0009] A first embodiment of the present invention will be described with reference to FIGS. 1 to 10. eration portion is operated approximately 1/4 the way, FIG. 13C is a view of a condition where the operation portion is operated approximately 2/4 the way, FIG. 13D is a view of a condition where the operation portion is operated approximately 3/4 the way, and FIG.13E isa view ofa condition wherethe operation portion is fully operated. FIG. 14 is a graph showing a relationship between the operation amount, and the flow amount and the flow channel area according to the second embodi- ment. 5 10 [0010] The driving tool10accordingtothe presentem- bodiment ejects a fastener by using externally supplied compressed air, and is provided with an air duster struc- ture thatjetsairoutofa nozzle17b byusingthisexternally supplied compressed air. By thus providing the driving tool10 with the airdusterstructure,driving bythe fastener and cleaning by the air duster can be performed without exchanging tools. [0011] As shown in FIG. 1, this driving tool 10 is pro- vided with a tool body 11 having a striking mechanism inside, a grip 12 provided so as to protrude from the tool body 11 in an orthogonal direction, a trigger 13 provided on the grip 12 so as to be operable, a nose portion 14 provided so as to protrude on the tip of the tool body 11, a magazine 15 connected in the rear of the nose portion 14, and an operation portion 30 provided so as to be depressable in order to actuate the air duster structure. FIG. 15 is a cross-sectional view of a flow amount adjustment mechanism according to a third embod- iment, anda view ofa condition where the operation portion is not operated. FIG. 16 is a cross-sectional view of the flow amount adjustment mechanism according to the third em- bodiment, and a view of a condition where the oper- ation portion is depressed all the way in. 15 20 FIGS.17A to17D are views explainingtheoperation ofthe flow amountadjustmentmechanismaccording to the third embodiment, FIG. 17A is a view of the condition where the operation portion is not operat- ed, FIG. 17B is a view of a condition where the op- eration portion is operated approximately 1/3 t he way, FIG. 17C is a view of a condition where the operation portion is operated approximately 2/3 the way, and FIG.17D isa view of acondition where the operation portion is fully operated. 25 [0012] The strikingmechanismincorporated in the tool body 11 actuates a driver (which is a fastener driving member) by using the force of the compressed air. The driveris movablein the direction toward the nose portion 14 in order to eject a fastener. The driver having moved in the driving direction ejects a fastener that is set inside the nose portion 14. The fastener ejected by the driver is ejected from an ejection hole 14a that is open at the tip of the nose portion 14. 30 35 [0013] When this driving tool 10 is used, the grip 12 is gripped and grasped, and thetrigger 13 ispulled. By this operation, the above-described striking mechanism is actuated to eject a fastener. FIGS. 18A and 18B are views explaining a stepwise adjustmentofthe flow channelareaaccording to the third embodiment, FIG. 18A is a view of a condition where the flow amount of the air is controlled by the change ofthe clearance amountata throttle portion, and FIG. 18B is a view of the condition where the flow amount of the air is controlled by the change of the opening amount of the opening portion. FIG. 19 is a graph showing a relationship between the operation amount, and the flow amount and the flowchannelarea according to the third embodiment. FIG. 20isa graph showingtherelationship between the operation amount, and the flow amount and the flow channel area when a release valve or a pipe line is formed in a simple tapered shape. 40 45 [0014] In the magazine 15, a connection fastener is accommodated, and the foremost fasteners of this con- nection fastener are successively supplied in the direc- tion toward the nose portion 14 (immediately below the driver before the driving operation) . [0015] The compressed air for actuating the above- described striking mechanism and air duster structure is supplied from an air supply source such as an air com- pressor. Specifically, an air hose for supplying air con- nected toa compressororthe like isconnectedtoanend cap portion 16 provided on the rear end of the grip 12, and the compressed airis supplied through this airhose. The compressed air supplied from the end cap portion 16 passes through an air supply channel formed inside the grip 12, and is supplied to the striking mechanism or to the air duster structure. [0008] Hereinafter,embodimentsofthe presentinven- tion will be described with reference to the drawin While in the followingembodiments,asa usage example of the air duster structure, a driving tool 10 provided with an airdusterstructure iscited asan example,the present invention is not limited thereto; the air duster structure according to the present invention may be applied to dif- ferenttools.Forexample,theairdusterstructure accord- ing to the present embodiments may be applied to an air duster gun. 50 55 [0016] In the striking mechanism, when the trigger 13 isoperated,the compressed airissupplied intoa striking cylinder, this compressed air acts on a striking piston to drive the striking piston, and the driver coupled to the striking piston drives a nail. [0017] In the air duster structure, when the operation portion 30 is operated, the compressed air is jetted out of the nozzle 17b that is open in the neighborhood of the 3 DETAILED DESCRIPTION OF EXEMPLARY EMBOD- IMENTS