US 5,100,271 A · Tool driving unit

Abstract

A tool driving unit for moving a tool in axial direction thereof and for rotating the tool about its axis. The tool driving unit comprises a spindle supported in the housing frame, a tool chuck mounted on the one end portion of the spindle for holding the tool, a first motor including a first hollow rotor and for rotating the spindle, a second motor including a second hollow rotor and for moving the spindle in the axial direction, means for transmitting a rotation of the first hollow rotor to the spindle, and means for converting a rotation of the second hollow rotor into axial movement of the spindle. The first rotor is rotated to rotate the spindle which corotatably engages the first rotor through the transmitting means. The second rotor is rotated, and the spindle is smoothly moved axially forwardly or rearwardly by the converting means which converts rotary motion of the second rotor to axial motion of the spindle.

Claims20

Dependent claims

A tool driving unit for moving a tool in axial direction thereof and for rotating the tool about its axis, said tool driving unit comprising:

a housing frame;
a spindle supported in said housing frame and extending in said housing frame, said spindle having one end portion projecting out of said housing frame;
a tool chuck mounted on said one end portion of said spindle for holding said tool;
spindle supporting means for rotatably mounting said spindle therein, said spindle supporting means being slidable together with said spindle, in the axial direction and being prevented from being rotated;
a first motor comprising a first stator fixed to said housing frame and a first hollow rotor disposed around said spindle for rotating said spindle;
a second motor, provided apart from said first motor, comprising a second stator fixed to said housing frame and a second hollow rotor disposed around said spindle supporting means for moving said spindle supporting means together with said spindle in the axial direction, said second motor being energized irrespective of energization of said first motor, whereby said spindle supporting means and said spindle are moved in the axial direction irrespective of a rotation of said spindle;
and
control means for controlling said first and said second motors according to an input command given by the operators.

5 more elements

A tool driving unit for moving a tapping tool in axial and rotational direction thereof, comprising:

a housing frame;
a spindle supported in said housing frame and extending in said housing frame, said spindle being supported in said housing frame and having said tapping tool at one end portion projecting out of said housing frame and plural axial splines formed on the outer periphery of the other end portion;
a tool chuck mounted on the one end portion of said spindle for holding said tapping tool;
a first motor provided in said housing frame for rotating said spindle, said first motor comprising a first hollow rotor disposed around said spindle and a first stator fixed to said housing frame;
roller bearings provided between said splines and said first hollow rotor for transmitting a rotation of said first hollow rotor to said spindle to rotate said spindle;
a second motor provided apart from said first motor in said housing frame for moving said spindle in the axial direction, said second motor comprising a second hollow rotor disposed around said spindle and a second stator fixed to said housing frame;
a first detection means provided beside said first hollow rotor for detecting a rotational speed and an angular position of said first motor;
a second detection means provided beside said second hollow rotor for detecting a rotational speed and an angular position of said second motor;
a motor control means for controlling rotations of said first and second motors in accordance with the detected rotational speeds and angular positions;
a hollow quill concentrically disposed over said spindle and axially slidably disposed in said housing frame, said spindle being rotatably provided within said hollow quill and having a cam groove formed on the outer peripheral surface of said hollow quill;
a cam follower provided at the inner peripheral surface of said second hollow rotor in such a manner as to be slidably engageable with said cam groove of said hollow quill, said hollow quill being moved in the axial direction thereof in accordance with the rotation of said cam hollower;
and
a control unit for controlling said first and second motors according to the input command given by the operators.

10 more elements

Dependencies are inferred from the claim text.

Tool driving unit

Life of this patent

Tool driving unit

Life of this patent

Abstract

Claims20