US Patent: 3,117,492
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| Machine Tool
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Patentee:
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| Johann Müller (exact or similar names) - Munich, Munich District, Bavaria, Germany |
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Patent Dates:
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| Applied: |
Nov. 14, 1960 |
| Granted: |
Jan. 14, 1964 |
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Patent Pictures:
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Joel Havens
"Vintage Machinery" entry for Friedrich Deckel GmbH
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Description: |
| Prior application in Germany, 19 Nov., 1959.
Abstract:
This invention relates to a machine tool, and particularly to a milling machine having a spindle head which is displaceable in the direction of the axis of the tool spindle (or the axes of the tool spindles, if more than one) relative to the gear case, and in which at least one tool spindle is displaceable in the same direction relatively to to the spindle head. Machine tools of this construction have the advantage of a large working range of the tool, because after exhausting the displaceability of the spindle head relative to the gear case on which it slides, the tool spindle itself can then be further displaced in the same direction, being pushed axially out of the spindle head. Such a machine tool can also be used as a boring machine, due to the possibility of advancing the tool in the direction of the axis of the tool spindle. Prior machines of this character have not been able to take full advantage of these possibilities, however, because for precision work a mechanically driven feed is necessary, and because in the prior machines of this general character a mechanically driven feed has been available either only for the feeding of the spindle head, or only for the feeding of the tool spindle, while the other one of these feeding motions has had to be performed manually.
Claim:
A machine tool comprising a gear case, a spindle head mounted on said gear case, a plurality of tool spindles rotatably mounted in said spindle head with their axes parallel to each other, at least one of the tool spindles being mounted for axial feeding displacement relative to the spindle head, said spindle head being mounted for feeding displacement relative to said gear case in a direction parallel to the axes of said tool spindles, characterized by a first feed screw operatively connected to said spindle head to feed said spindle head relative to said gear case when said first feed screw is moved longitudinally relative to said gear case, spindle feed means including a second feed screw and a nut threadedly engaging said second feed screw and held against rotation in said spindle head to travel longitudinally on said second feed screw when said second feed screw is turned, an operative connection between said nut and said displaceable tool spindle to feed said displaceable tool spindle axially from axial movement of said nut, an operative connection between said first feed screw and said second feed screw to turn the latter from rotation of the former, a second nut mounted in said gear case for rotation without axial movement, said second nut being threaded on said first feed screw, power operated means for turning said second nut, and shiftable clutch means movable between two positions in one of which said first feed screw is held against rotation and in the other of which said first feed screw is coupled to said second nut to turn therewith, so that when said first feed screw is held against rotation the rotation of said second nut will cause longitudinal movement of said first feed screw to feed said spindle head relative to said gear case, and so that when said first feed screw is coupled to turn~ with said second nut, rotation of said second nut will not cause longitudinal movement of said first feed screw but will cause joint rotation of said first feed screw and said second feed screw, thereby feeding said displaceable tool spindle. |
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