| 摘要 |
The machine for forming threads on bolts, and the like blanks by means of thread rolling tools, as described, comprises a frame, a thread rolling tool movable in the frame of the machine, said rolling tool being reciprocal along a cooperating stationary rolling tool mounted on a holding means in the frame, means for adjusting the holding means and the stationary tool; in vertical direction with respect to the direction of reciprocation of the movable tool so as to obtain the desired pitch of the screwthread on the blank; in a transverse direction perpendicular to the direction of the reciprocation so as to obtain the desired diameter of the screwthread on the blank; and in an inclined position in order to provide for the same diameter over the entire length of the threads on the blank. In this construction the holding means in the form of a block is provided with a cleft substantially in its longitudinal direction parallel to the direction of movement of the reciprocable rolling tool, said cleft ending at its bottom in a slit-shaped bore also extending in said longitudinal direction, said holding means being provided at its topside with a groove opening into said cleft, and an adjusting member in the groove for controlling the width of said groove.
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