To simply measure a back-lash by integrally molding the reversible screw part of an adjust blot with a clutch surface connected to the reversible screw part of the adjust blot, and by minimizing the incomplete screw part of a reversible screw to improve moldablity.
In adjust bolt 30, an irreversible male screw is notched on its one side (at the left hand part of the drawing) to screw with a first piston 16. A multiple thread 34 is notched no an intermediate large diameter part for screwing a driving ring 35. The multiple thread 34 and the female screw of the driving ring 35 form a reversible screw. A conical clutch surface 38 is formed on the adjust bolt 30 at the other side (at the right hand part of the drawing) to clutch-engage with the first conical surface 23a of a partition wall 12. The 34 is integrally molded with the clutch surface 38 connected to the therad 34 by forging, sintering or the like. Thus, the incomplete screw part of the reversible screw part is shortened. Pressing-in process is eliminated, enhancing coaxiality, resulting in positive operation. Thus, durability is enhanced to exactly, simply, promptly measure a back-lash.
TAKASHIMA MICHINORI
FUKUDA MASATAKA
NISSHIN SPINNING
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