Work holders – Holder mounted for movement – With plural means for changing holder positions
Reexamination Certificate
2000-08-15
2001-12-25
Hail, III, Joseph J. (Department: 3723)
Work holders
Holder mounted for movement
With plural means for changing holder positions
C269S073000, C269S027000, C269S082000
Reexamination Certificate
active
06332604
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to clamping and positioning mechanism for the inclined axis of two-axes rotary tables.
2. Description of the Prior Art
Two-axes rotary table is machinery which utilizes a revolving arm installed on an inclined axis for supporting a work to be cut by machine spindle. The position of the inclined axis can be moved and settled at a proper location for facilitating the cutter to perform cutting or forming a curved surface on the work.
FIG. 3
shows a cross sectional view of a conventional two-axes rotary tables. As shown in
FIG. 3
a layer of brake diaphragm
93
is formed at the contact surface
92
between the inclined axis
90
and a stationary supporting frame
91
for positioning the inclined axis at a position. There is oil pressure supply means
94
installed for providing pressurized oil for actuating the brake diaphragm
93
to press against the contact surface
92
thereby positioning the inclined axis
90
at a position of predetermined inclination angle. However, there are disadvantages inherent to such a brake diaphragm employed by the conventional art i.e.:
The inclined axis
90
together with its sustaining revolving arm is difficult to withstand a force for maintaining at its proper position for a required time due to insufficient pressure supplied by the brake diaphragm
93
. As a result, the inclined axis
90
may be shifted from its proper position to cause affecting the working accuracy of the work table.
The brake diaphragm
93
might be deformed or even cracked after a period of time in use for a constant oil pressure exerted thereon. As a result, it not only affects the braking effect but also shortens the life of the brake diaphragm
93
. It further increases cost of maintenance if a number of related components have to be detached and reassembled when a defected brake diaphragm
93
is to be replaced.
SUMMARY OF THE INVENTION
Therefore, the present invention has been made in order to eliminate the disadvantages inherent to the conventional technique as mentioned above.
It is an object of the present invention to provide clamping and positioning mechanism for the inclined axis of two-axes rotary tables having a strong braking strength sufficient to maintain the inclined axis and its sustaining revolving arm at a position of a predetermined inclination angle for a period of required time so as to obtain a reliable positioning effect and improve work accuracy.
It is another object of the present invention to provide clamping and positioning mechanism for the inclined axis of two-axes rotary tables able to prevent deformation or crack even after long time of use without affecting its braking effect thereby lengthening its lifetime and saving maintenance cost.
To achieve the above mentioned objects, there is provided a clamping and positioning mechanism comprising an annular recessed slot formed along the outer surface of a stationary supporting frame. In the annular recessed slot, there is installed a piston with a large cross sectional area and a plurality of connecting rods are in connection with the piston. The plurality of connecting, rods are penetrated through corresponding plurality of respective through holes which are bored through the stationary supporting frame, and are extended until the surface of an axle bush of the inclined axis. There are a plurality of double diameter holes opened on the axle bush so as to accept a plurality of double diameter brake members passing through those corresponding double diameter holes and screw combine with the extended ends of the connected rods respectively. A spring is provided to regularly and elastically pressing against the piston such that the double diameter brake members are under relaxed position. As soon as an oil pressure is exerted from a oil pressure supply means to actuate the piston, which in turn displaces each double diameter brake member to a braking position by means of the connecting rods, the axle bush of the inclined axis and the stationary supporting frame are thus forcibly pressed each other, and furthermore, the inclined axis together with the revolving axis sustained thereon is exactly positioned at a position with a predetermined inclination angle.
REFERENCES:
patent: 2538640 (1951-01-01), Click
patent: 3700228 (1972-10-01), Peale
patent: 4844431 (1989-07-01), Camp et al.
patent: 6019357 (2000-02-01), Bartsch et al.
Fair Friend Enterprise Co., Ltd.
Hail III Joseph J.
Rosenberg , Klein & Lee
Wilson Lee
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