Patent ID: 8397970

Claim:
A driving machine comprising: a driver blade for striking a fastener; and a nose portion having an injection passage for the fastener to be injected, wherein the nose portion comprises: a first guide member extending in an injecting direction of the fastener, a cross section of the first guide member perpendicular to the injecting direction being substantially U-shaped and having a semicircular portion and linear portions extending in a direction perpendicular to the injection direction, the linear portions extending parallel with each other; and a second guide member having an arcuate surface which is faced with the semicircular portion of the first guide member and flat surfaces which are faced with the linear portions of the first guide member, wherein: the second guide member is pivotally supported by a shaft, the second guide member can move to a first position at which a cross section of the injection passage perpendicular to the injecting direction is relatively large and to a second position at which the cross section of the injection passage is relatively small when the second guide member is abutting with a portion of the first guide member, and member to the second position, and the linear portions of the first guide member and the flat surfaces of the second guide member confront to each other in both cases where the second guide member is at the first position and at the second position.