n. 头座, 机头座

[机] 车头, 主轴台

[ noun ]
the stationary support in a machine or power tool that supports and drives a revolving part (as a chuck or the spindle on a lathe)
<noun.artifact>

Headstock \Head"stock`\ (-st[o^]k`), n. (Mach.)
A part (usually separate from the bed or frame) for
supporting some of the principal working parts of a machine;
as:
(a) The part of a lathe that holds the revolving spindle and
its attachments; -- also called {poppet head}, the
opposite corresponding part being called a tailstock.
(b) The part of a planing machine that supports the cutter,
etc.