Drive for relatively axially shifting chuck parts
OwnerGunter H. Rohminventor
Life of this patent
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Abstract
A machine tool has a housing normally rotated about a housing axis and a part that is axially movable relative to the housing to adjust the tool. An adjustment apparatus for the tool has a drive having a rotary drive output, a differential transmission having a rotary input connected to the drive output and a pair of transmission outputs. This transmission includes a reverser for rotation of one of the transmission outputs opposite that of the other transmission output. Respective wheels coupled to the transmission outputs are rotatable coaxially on the tool housing and respective screws are rotationally coupled to the wheels, axially fixed on the tool housing, and both threaded in the movable part of the machine tool. According to this invention one of the screws is of opposite hand to the other screw.
Claims11
In combination with a machine tool having a housing normally rotated about a housing axis and having a part that is axially movable relative to the housing to adjust the tool, an adjustment apparatus for relatively axially displacing the housing and the part of the tool, the apparatus comprising:
- drive means having two oppositely rotating drive outputs;
- two respective wheels coupled to the drive outputs and rotatable coaxially on the tool housing;
- and
- two respective axially extending screws rotationally coupled to the respective wheels, axially fixed on the tool housing, and both threaded axially in the movable part of the machine tool, one of the screws having a screwthread of a predetermined hand and the other of the screws having a screwthread of opposite hand.
In combination with a machine tool having a housing normally rotated about a housing axis and having a part that is axially movable relative to the housing to adjust the tool, an adjustment apparatus for relatively axially displacing the housing and the part of the tool, the apparatus comprising:
- drive means having two oppositely rotating drive outputs, the drive means being a differential transmission including
- a drive motor having a rotary output,
- a pair of coaxial output bevel gears one of which constitutes one of the drive outputs,
- a rotary input member between the bevel gears and connected to the drive-motor rotary output,
- an equalizing gear carried on the input member and meshing with the bevel gears, and
- a reversing gear train connected between the other bevel gear and the other drive output;
- two respective wheels coupled to the drive outputs and rotatable coaxially on the tool housing;
- and
- two respective screws rotationally coupled to the wheels, axially fixed on the tool housing, and both threaded in the movable part of the machine tool, one of the screws having a screwthread of a predetermined hand and the other of the screws having a screwthread of opposite hand.
In combination with a machine tool having a housing normally rotated about a housing axis and having a part that is axially movable relative to the housing to adjust the tool, an adjustment apparatus for relatively axially displacing the part and the housing, the apparatus comprising:
- drive means having a rotary drive output;
- a differential transmission having a rotary input connected to the drive output and two transmission outputs, the differential transmission including reversing means for rotation of one of the transmission outputs opposite that of the other transmission output;
- two respective wheels coupled to the transmission outputs and rotatable coaxially on the tool housing;
- and
- two respective axially extending screws rotationally coupled to the wheels, axially fixed on the tool housing, and both threaded axially in the movable part of the machine tool, one of the screws having a screwthread of a predetermined hand and the other screw having a screwthread of opposite hand.
Dependencies are inferred from the claim text.