Power drive nailing machine

1. A nailing machine comprising:

a nose portion;

an injection port formed at the nose portion;

a contact member arranged to be projected in a direction of a front end of the injection port and sliding along the nose portion;

a guide hole provided at a side portion of the nose portion;

a contact rod slidably and rotatably inserted into the guide hole, a lower end portion of which is connected to the contact member via a screw portion comprised of male and female threads; and

an operating dial being penetrated by the contact rod slidably inserted therethrough, being integrally rotatable with the contact rod, and being rotatable and immovable in an up and down direction with respect to the nose portion.

2. The nailing machine according to claim 1 , wherein by

rotating the operating dial, the contact rod is rotated and a projecting length of the contact member in the direction of the front end of the nose portion is adjusted.

3. The nailing machine according to claim 1 , further comprising:

an activation control apparatus for activating the nailing machine;

wherein an upper end portion of the contact rod is connected to the activation control apparatus, and the nailing machine is activated by operating to slide the contact member.

4. The nailing machine according to claim 3 , further

comprising:

a housing;

a cylinder provided inside of the housing;

a combustion chamber formed on a side of an upper portion of the cylinder; and

a piston driven inside of the cylinder by a combustion gas generated inside of the combustion chamber;

wherein the activation control apparatus includes a movable valve for opening and closing an interval between the combustion chamber and the atmosphere;

wherein the contact rod is connected to a side of the movable valve by penetrating a flange portion formed at an upper end of the nose portion on a side of the upper end portion; and

wherein the combustion chamber is shut off from the atmosphere to be hermetically closed by operating the movable valve by way of the contact rod by bringing the contact member into contact with a struck member to be operated to slide.

5. The nailing machine according to claim 1 , wherein the contact rod includes a male screw at the lower end portion, the contact member includes a female screw, and the male screw and the female screw are connected.

6. The nailing machine according to claim 1 , wherein the contact rod includes a female screw at the lower end portion, the contact member includes a male screw, and the female screw and the male screw are connected.

7. The nailing machine according to claim 1 , wherein the contact rod includes a hexagonal section portion, the operating dial includes a hexagonal hole, and the hexagonal section portion is slidably inserted into the hexagonal hole in an axial direction of the contact rod, and the contact rod and the operating dial are integrally rotated.

8. The nailing machine according to claim 1 , further comprising:

a flange portion provided at the nose portion; and

a guide member provided on a lower side of the flange portion;

wherein the operating dial is interposed between the flange portion and the guide portion and is restricted from being moved in an up and down direction.

9. The nailing machine according to claim 1 , wherein the

operating dial is formed of a synthetic resin.

10. The nailing machine according to claim 1 , wherein the contact rod

is constituted substantially by a straight shape.