Forging device and re-centering attachment of forging device

An alignment transcription attachment to be coupled to a forging device, the forging device comprising:

• a stationary part comprising a die,
• a movable part reciprocally movable to and away from the stationary part in a moving direction,
• a punch holder detachably attached to the movable part, and
• a punch tool that is paired with the die and is detachably attached to the punch holder;
• the punch holder comprising:
• an upper reference stud hole drilled through the punch holder with an axis of the upper reference stud hole along the moving direction of the movable part,
• a lower reference stud hole drilled through the punch holder with an axis of the lower reference stud hole along the moving direction of the movable part in an opposing side of the upper reference stud hole across the punch tool,
• an upper reference stud fixed to the movable part such that the upper reference stud is loosely fitted in the upper reference stud hole of the punch holder,
• a lower reference stud fixed to the movable part such that the lower reference stud is loosely fitted in the lower reference stud hole of the punch holder, wherein either the upper reference stud or each of the upper and lower reference studs is defined as a reference stud, and either the upper reference stud hole or the lower reference stud hole in which the reference stud is loosely fitted is defined as a reference stud hole,
• a plurality of adjusting bolts each comprising a male screw portion, the adjusting bolts to be tightened with respect to the reference stud from an outside of the punch holder into a direction of the reference stud to move the punch holder into an alignment direction, defined as a direction in which the punch holder is moved to align the punch tool and the die, with fixing the punch holder at a position of the reference stud, and
• clamping nuts which are engaged with the upper reference stud and the lower reference stud, respectively, and fix the punch holder at a complete alignment position, defined as a position at which the punch tool and the die are aligned,
• the alignment transcription attachment comprising:
• a substantially thick-plate shaped block body that is set in contact with a surface of the punch holder at a portion covering the upper reference stud hole on a side facing the stationary part,
• an extended bolt hole drilled though the block body to communicate with the reference stud hole of the punch holder,
• an adjusting bolt tightened into a direction of the extended bolt hole from the outer side of the punch holder to be in contact with the reference stud, and
• a positioning nut movably engaged with the male screw portion of the adjusting bolt, wherein
• the block body is coupled or bolted to the punch holder with the extended bolt hole communicating with the reference stud hole, the adjusting bolt of the block body is tightened till the bolt hits the reference stud in alignment, the positioning nut is tightened till the positioning nut hits the block body, and the tightened positioning nut is un-rotatably fixed to the male screw portion of the adjusting bolt.