Metal working – Plural diverse manufacturing apparatus including means for... – Common reciprocating support for spaced tools
Patent
1985-10-10
1987-05-12
Weidenfeld, Gil
Metal working
Plural diverse manufacturing apparatus including means for...
Common reciprocating support for spaced tools
279 1TS, 409232, B23B 3126
Patent
active
046638237
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to machine tools and is concerned with mounting of work holders on a machine tool spindle and the operation of the work holder when so mounted.
It is known to provide a work holder with a grip element which can be automatically moved between positions in which it grips and releases the workpiece. It is an object of this invention to provide such a work holder with the facility for being mounted automatically on the spindle so that the work holder can be changed in a numerically controlled machine tool without the need for operator intervention. The need for automatic mounting arises, for example, if one end of the workpiece has been machined and the workpiece has to be turned round to be held by said one end while the other end of the workpiece is machined, said one end, having been machined, usually has a shape or a diameter different from that other end, the latter usually still having the dimension of the original workpiece blank. Therefore a change of work holder is often required before the workpiece can be held at said one end. This applies especially in cases where the work holder is of a type which type is suitable for automatic operation of the gripper elements but usually cannot accommodate large differences in the size of the workpiece.
SUMMARY OF THE INVENTION
According to this invention there is provided a machine tool comprising a fixed structure, a spindle supported for rotation on the fixed structure, a work holder having gripper jaws movable between work gripping and work release positions, gripper operating means provided on the fixed structure and connected to the jaws for moving the jaws between said positions thereof, a coupling having first and second coupling elements provided respectively on the spindle and on the work holder and movable between engaged and disengaged positions, coupling operating means provided on the fixed structure and connected to the coupling elements for moving the coupling elements between said positions thereof to respectively connect the work holder to the spindle and release it therefrom.
BRIEF DESCRIPTION OF THE DRAWINGS
Examples of a machine tool according to this invention will now be described with reference to the accompanying drawings wherein:
FIG. 1 is an elevation of the machine tool,
FIG. 2 is a plan view of the machine tool,
FIG. 3 is a section on the line III--III in FIG. 1,
FIG. 4 is a section on the line IV--IV in FIG. 1 and shows a first example of a spindle and work holder assembly being a part of the machine tool,
FIG. 5 is a section on the line V--V in FIG. 4, and
FIGS. 6,7,8 and 9 are views similar to FIG. 4, and show respectively a second, third, fourth, and fifth example of a said spindle and work holder assembly.
DETAILED DESCRIPTION OF EXAMPLES
Referring to FIGS. 1 to 5, the machine tool comprises a spindle 10 supported for rotation about an axis 10A by a bearing housing 2 which constitutes stationary structure as far as the spindle 10 is concerned. Rotation of the spindle 10 is effected by an electric motor M10 (FIGS. 2,4). The spindle 10 can be stopped in a predetermined angular position by an electro-magnetic brake 11. The spindle 10 supports a work holder 50 shown to hold a workpiece 51 intended to be machined by a tool 61. The machine includes a magazine system 30 (FIGS. 2,3) comprising a work holder magazine 31, a tool holder magazine 32, a magazine 33 for blank workpieces, and a magazine 34 for finished workpieces. The magazine 31 stores different holders 50 adapted for workpieces of different diameters or shapes. The machine further includes a transfer mechanism 40 operable to present any work holder, tool holder or blank workpiece contained in the respective magazines 31,32,33 at a pick-up station 35 and to transfer a finished workpiece to said station 35.
The mechanism 40 comprises a shaft 41 having an axis 41A and extending parallel to the axis 10A in a position between the spindle 10 and the magazine system 30. An arm 42 is supported on the shaft 41 for axial mot
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Renishaw plc
Webb Glenn L.
Weidenfeld Gil
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