Patent ID: 11904382
Assignee: DAI-ICHI DENTSU LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 5:
6. The press apparatus according to claim 1, wherein:
the power-transmission mechanism comprises:
a planetary-roller screw mechanism that comprises a nut extending in the first direction, a screw shaft extending in the first direction within the nut, and a plurality of planetary-roller screws disposed between the nut and the screw shaft; and
a linear-motion mechanism configured to block rotation while a load is being transmitted;

the planetary-roller screw mechanism is provided within the first frame part;
one of the nut and the screw shaft is rotationally driven by the rotary shaft; and
the other of the nut and the screw shaft is formed integrally with the ram in the state in which it is non-rotatable relative to the frame owing to the linear-motion mechanism.