Toshiba Kikai Kabushiki Kaisha

Kazumichi Aoki

Hideki Hayashi

Masayuki Kobayashi

Tadashi Sano

A hydraulic control apparatus is provided to prevent failure that can occur due to hunting, to elevate performance of a hydraulic control valve, and to improve operation efficiency by effectively conducting bleed off. The hydraulic control apparatus can include a first change over valve group that can include a change over valve connected with a first delivery line associated with the variable capacity pump, and arranged to have load sensing function. A second change over valve group can also be provided, and can include at least one change over valve connected with a second delivery line associated with the variable capacity pump. An open and close motion valve and a compensation valve can be configured to constitute a pressure compensation flow control means connected through the second delivery line and the second change over valve group.

Hydraulic control apparatus

A machine tool which has a swingable spindle head comprises a base member 1, a retaining member 5 attached swingably by a support shaft 3 to the base member 1, a spindle head 7 attached onto the retaining member 5, a lateral slider 15 being capable of linearly reciprocating in a linearly reciprocating direction along a chord of a circular arc described by an end portion of the retaining member 5, a longitudinal slider 21 provided in the lateral slider 15 reciprocating in a direction perpendicular to the chord, a connecting shaft 23 pivotally connecting the retaining member 5 to the longitudinal slider 21, and a linear drive system connecting to the lateral slider 15. When the linear drive system drives, the retaining member 5 can be swung around the support shaft 3, so that swing of the spindle head 7 can be permitted.

Growing community of inventors

Kanagawa-ken, Japan

Kazumichi Aoki