Patent ID: 7222509

Claim:
A groove processing apparatus for forming a groove in an axial direction of a cylinder on an inner peripheral surface thereof, comprising: a guide member ( 1 ) arranged in a stationary state inside the cylinder, the guide member including a flat guide face ( 1 a ) in parallel with the axial direction of the cylinder; a sliding member ( 2 ) located slidably on the flat guide face ( 1 a ) of the guide member and movable in the axial direction of the cylinder; a profiling member ( 3 ) located slidably on the sliding member ( 2 ) and movable in the axial direction of the cylinder independently of the sliding member, the profiling member having an oblique face at a tip portion ( 3 a ) thereof; and a holder member ( 4 ) connected rotatably at one end thereof to a tip portion of the sliding member ( 2 ), the holder member comprising: a profiling roller ( 5 ) disposed at a rotating end in the backside of the holder member ( 4 ) to run on the oblique face of the profiling member ( 3 ); and a processing roller ( 6 ) disposed at a mid-position of the holder member ( 4 ), as opposed to the inner peripheral surface of the cylinder, wherein: the profiling roller ( 5 ) runs on the oblique face of the profiling member ( 3 ) to incline the holder member ( 4 ) and thereby to push the processing roller ( 6 ) into the inner peripheral surface of the cylinder where the sliding member ( 2 ) and the profiling member ( 3 ) move in the axial direction of the cylinder relative to the cylinder and the guide member ( 1 ) to form a groove extending in the axial direction on the inner peripheral surface of the cylinder.