US2493621A - Lathe control movement - Google Patents

Description

Jan. 3, 1950 G. E. CUTTAT 2,493,621

LATHE CONTROL MOVEMENT Filed Dec. 28, 1946 v Fr? IN VE N TOR fieorges Emi/e (L/i222 A TT RNEY Patented Jan. 3, 1950 LATHE CONTROL MOVEMENT Georges Emile Cuttat, Geneva, Switzerland, assignor to Manufacture de Machines du Haut- Rhin, Haut-Rhin, France, a company of France Application December 28, 1946, Serial No. 719,085 In France August 3, 1939 Section 1, Public Law 690, August 8, 1946 Patent expires August 3, 1959 2 Claims.

The present invention relates to the control of the spindle carrying poppets in automatic lathes.

The control of the longitudinal displacement of these poppets has already been realized by means of levers, inclined planes or levers controlled by slides. However, in all the devices used heretofore, a number of the control elements were subjected to torsional or flexural stresses, especially in case where the slide is controlled directly by a cam. In such a case, there resulted abnormal stresses on the whole of the device. In accordance with the present invention, these drawbacks are avoided; the control is ensured by means of two levers rotating in two planes perpendicular to each other and by a slide, transmitting the motion of one of the levers to the other, said slide being moved by one of the levers in the plane of the latter and engaging the extremity of the other lever arranged in a perpendicular plane.

In this way, the axles of the two levers are subjected only to stresses normal to them and which it is easy to take into account by the dimensioning of these axles, with the exclusion of any lateral reaction causing torsional effects on these axles and the parts they carry.

One type of embodiment of the control device which is the object of the invention will be described hereinafter by way of example, with reference to the appended drawing in which:

Figure 1 is an end view of the device;

Figure 2 is a side elevation thereof;

Figure 3 is a plane View, and

Figure 4 shows part of an alternate control device.

It can be seen (Figures 1 to 3), that lever I, capable of turning around an axis 5 on the frame of the machine, in a vertical plane, receives its motion, through roller 2, mounted at its end, from a control cam 3, receiving its rotary motion in any appropriate manner. Lever I, presents an upper branch with a roller 4, acting on a thrust block I, provided, on the edge of a notch made in a slide 6, capable of a rectilinear displacement upon an appropriate guide of the frame, in the plane of lever I. This slide is fitted with a thrust block I5, acting on roller 8 placed at the end of one of the arms of two arm lever 9, capable of oscillating about vertical pivot I0, mounted on the frame.

The other lever 9 presents a slide along which bushing I6, provided with a push element II acting directly on poppet I I can be fixed in various positions.

It will be clear that the above described control device acts in one sense only, that indicated by arrow f in Figure 1; in the other sense, the motion is ensured in a known manner by a spring or any appropriate counter-weight.

The mode of operation is easy to understand. Cam 3, upon turning, swings lever I towards the left (Figure 1) and the latter moves slide 6 in the same direction. The latter, by its thrust block I5, acts on roller 8 of lever B, which turns about axis I0. Push element II acts on the poppet which it displaces longitudinally. It is clear that the amplitude of displacement of the poppet will vary according to the position occupied by bushing I6, inside the slide I 2.

It must be noted that with such a device, free of torsional stresses, it is possible to multiply, without any disadvantage, the stroke given to the cam to obtain a longer displacement of the poppet, while, with known devices, a ratio of 1:1 could not be exceeded with respect to the displacement imparted by the cam.

It is clear that levers I and 9 could have different positions provided they remain in two planes, perpendicular to each other, and that there exists an intermediate slide transmitting motion from one to the other.

For certain precision jobs, and to avoid having to design too complicated a cam profile, two twin cams 3, 3, can be used, as already known in other types of control (Figure 4), one of which acts on lever I, and the other on lever I. Lever I comprises a thrust screw I9, so that lever I can drive lever I". According to the profiles of cams 3' and 3", it is now the one, then the other which controls the motion of the slide.

What I claim is:

1. A longitudinal control device of the poppet in automatic lathes comprising at least one cam, the plane whereof is perpendicular to the axis of the poppet, a lever receiving its motion in the same plane from said cam, a roller mounted on the operative end of said lever, a slide movable perpendicularly to the axis of the poppet, a thrust block on said slide engaged by said roller, a second thrust block on said slide, a second lever moving in a plane perpendicular to the plane of motion of said first lever, a roller mounted on one arm of said second lever and engaged by said second thrust block, whilst the other arm of said second lever exerts a pushing action on the poppet.

2. A longitudinal control device of the poppet in automatic lathes, two coaxial earns the planes of which are perpendicular to the axis of the a second thrust block on said slide, a third lever adapted to move in a plane perpendicular to the plane of motion of said first levers, a roller mounted on one arm of said third lever and en- 10 gaged by said second thrust block, whilstthe other arm of said third lever exerts a pushing action on the poppet.

GEORGES CU'IITAT..

4 REFERENCES CITED The following references are of record in the file of, this patent:

UNITED STATES. PATENTS Number Name Date 651,828 Copland June 19, 1900 1,345,497 Kempin July 6, 1920 2,368,793 Wilson Feb. 6, 1945 FOREIGN PATENTS Number 7 Country Date Switzerland Apr. 16, 1928

Images