Spindle device

Details Spindle device Spindle device

1983-03-14

1986-06-24

Vlachos, Leonidas

Turning

Severing or cut-off

Interrelated means for tool infeed and circumrotation

B23B 1902

Patent

active

045961697

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a spindle device used in the lathe, etc., and provides a spindle device whereby highly accurate rotation can be obtained without causing much spindle swing.


BACKGROUND ART

Recently, the demand for precision machined parts is increasing and lathes using various spindle devices have been put in practical use to meet the demand. A cam type lathe using such a conventional spindle device will now be described with reference to FIG. 1.
A workpiece 1 is rotated by a chuck 4 attached to the spindle 3 of a headstock 2. The torque is transmitted to the spindle by a belt 5, but the situation is that a variation in the tension of the belt 5 causes deformation of the spindle 2, making it impossible to attain accurate rotation of the workpiece 1. In an effort to avoid this difficulty, a magnetic coupling has been employed where accuracy is required, but there has been a problem that such a device is too complicated to be practical.


DISCLOSURE OF INVENTION

The invention relates to a spindle device used in a lathe, etc., wherein a hydrostatic fluid bearing is formed between the spindle and a housing rotatably supporting the spindle to make it possible to attain highly accurate rotation without causing much spindle swing, and a rotatable pulley is installed through a bearing on the outer periphery of a bracket fixed to the housing, said pulley and spindle being connected together only in the direction of rotation, thereby remedying the drawback that accurate rotation cannot be effected, which has heretofore been a problem, so as to make it possible to obtain highly accurate rotation.


BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic plan view of a cam type lathe using a conventional spindle device;
FIG. 2 is a plan view of a lathe using a spindle device according to an embodiment of the present invention;
FIG. 3 is a front view, partly in section, of said lathe;
FIG. 4 is a side view, partly in section, of said lathe;
FIG. 5 is a longitudinal view, in section, of the headstock of said lathe;
FIG. 6 is a sectional view taken along the line 6--6 of FIG. 5;
FIG. 7 is a sectional view taken along the line 7--7 of FIG. 5; and
FIG. 8 is a hydraulic circuit diagram of the lathe of said embodiment.


BEST MODE OF CARRYING OUT THE INVENTION

FIG. 2 is a plan view of a lathe using a spindle device according to an embodiment of the invention, also showing the layout of a hydraulic unit and control device, which are appurtenant devices. FIGS. 3 and 4 are a front view and a side view of the lathe, respectively.
In FIGS. 2-4, the spindle 21 of a headstock 20 has a chuck 22 attached thereto, and a workpiece 23 is gripped by the chuck 22. The spindle 21 is rotated by a pulley 28 receiving through a flat belt 27 the rotation of a belt pulley 26 connected to a spindle motor 24 by a coupling 25. The spindle motor 24 is fixed to a frame 30 by a bracket 29.
A cutter 31 is attached to a slide table section 34 through a cutter holder 32 and a cutter rest 33. The slide table section 34 comprises an X slide table 35 and a Y slide table 36.
A cam shaft motor 37 is attached to the frame 30 through a bracket 38, and the output of the cam shaft motor 37 is transmitted to the input shaft 43 of a speed reducer 42 through a pulley 39, timing belt 40 and pulley 41. Rotation of the input shaft 43 of the speed reducer 42 causes rotation of a cam shaft 44, which is the output shaft, thus rotating an X cam 45 and Y cam 46 attached to the cam shaft 44, and driving the X and Y slide tables 35 and 36 through levers 47 and 48. The cam shaft 44 has an encoder 49 connected thereto, so that a pulse signal detecting the rotative position of the cam shaft is fed to a control device 50.
In FIG. 2, a hydraulic unit 51, which is a hydraulic pressure generating device, serves to feed working fluid to a hydrostatic fluid bearing section for the headstock 20 and slide table section 34, while the control device 50 controls the hydraulic unit 51 and lathe main body 53 on the basis of signals from the encoder 49.
The

REFERENCES:
patent: 2278264 (1942-03-01), Hollengreen et al.
patent: 2419622 (1947-04-01), Anderson
patent: 3223463 (1965-12-01), Porath
patent: 3681879 (1972-08-01), Kobayashi
patent: 3735652 (1973-05-01), Scharfen

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