Machine element or mechanism – Control lever and linkage systems – Multiple controlling elements for single controlled element
Reexamination Certificate
1999-06-28
2001-02-13
Estremsky, Sherry (Department: 3681)
Machine element or mechanism
Control lever and linkage systems
Multiple controlling elements for single controlled element
C108S143000
Reexamination Certificate
active
06186024
ABSTRACT:
The content of Application No 98810673.8, filed Jul. 14, 1998 in Europe is hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for driving a platform, that can carry any object or, in the case of machine-tools, a tool holder spindle or a work piece spindle, in any direction of a plane, said plane being comprised of the two axes X and Z known in machine-tool engineering.
2. Description of the Prior Art
The displacement of such a platform, which can be a physical element or, in the case of machine-tools, which can be the tool holder spindle or the work piece spindle itself, is usually obtained by two crosswise superimposed slide-ways perpendicular to one another, driven each separately in one or the other direction or driven simultaneously in an intermediate combined direction.
A major inconvenience of this known arrangement of crosswise slide-ways resides in the superimposition of the two slide-ways, resulting in the tool holder spindle or work piece spindle being relatively far away from the guiding rails of the lower slide-way on the support frame of the machine; there is thus an important torsional moment of the spindle relative to these guiding rails. The superimposition of the two slide-ways further results in a lack of rigidity of the construction between the above mentioned guiding rails and the spindle. Also, the upper slide-way has a certain mass and is thus always co-driven when the lower slide-way is displaced, even when the upper slide-way is inactive, which limits the possible accelerations of the motor, of determined power, driving the lower slide-way. Finally, the orthogonal disposition of the driving means of the two slide-ways renders the design and construction of the machine more complicated.
JP-A-61.230.829 shows a device in which the two driving motors are disposed on parallel axes. The major inconvenience mentioned above relating to the superimposition of two orthogonal slide-ways remains.
OBJECT AND SUMMARY OF THE INVENTION
A first object of the present invention is to provide a device for displacing a platform in any direction of a plane comprised of two orthogonal axes, that does not encounter the disadvantages of the known devices.
A second object of the invention is that the aforementioned device be of simple design and construction and that it be compact and rigid.
It is another object of the invention to propose driving means and means for controlling the position of the device that are adapted to the particular geometry of the device.
It is yet a further object of the invention to propose a tool holder spindle or a work piece spindle fitted with the aforementioned device.
Finally, it is another object of the invention to propose a machine-tool, of any type, equipped with at least one tool holder spindle and/or work piece spindle fitted with the aforementioned device.
This is achieved by the proposed device having the characteristics mentioned in the characterizing part of claim
1
. Particular embodiments or variations are described in the dependent claims. Claims
20
to
22
describe spindles or a machine-tool as sought.
REFERENCES:
patent: 3010363 (1961-11-01), Malfeld
patent: 3645001 (1972-02-01), Bosworth et al.
patent: 4838515 (1989-06-01), Prentice
patent: 4972574 (1990-11-01), Isono et al.
patent: 4993673 (1991-02-01), Hirose
patent: 5339749 (1994-08-01), Hirose
patent: 5731641 (1998-03-01), Botos et al.
patent: 93 00 510 (1993-03-01), None
patent: 61-230829 (1986-10-01), None
Estremsky Sherry
Kummer Freres S.A. /Fabrique de machines
Oliff & Berridg,e PLC
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