US911944A - Slotting-machine. - Google Patents

Description

0. G. CURTIS. SLOITING MACHINE. APPLICATION FILED 0013, p02. RENEWED Arms, 1906.

91 1,944,. Patented Feb. 9, 1909.

4 SHEETS-SHEET 1.

f Witnesses: v Invenlnr Aifomeys G." G. CURTIS.

SLOTTING MACHINE. IAPPLIOATION FILED 0013, 1902. nnngwnn APR. e, 1906.

911,944. I I I Patented Fb.9, 1909.

4 sums-sum 2.

an I I W illlllllllllllllllll1ll" IIIIHIIIIHHINMMI iIIiiWWIIVIIIIIIIIIWI)fi Attorneys I i a l I I 1 I I I I I I V I s I l y i I I I l I l I I l I I I I I "l 1 M I 0. e, CURTIS. SLOTTING MAGHINE.

f APPILIOATION FILED 00m, 1902. nnnnwn'p Arms, 1006.

. Patented Feb. 9; 1-909,

I W W4 A 0. G. CURTIS.

SLOTTING MACHINE.

. APPLIOATION FILED 00T.3, 1902. RENEWED APR. 6, 1906.

Patented Feb. 9, 1909.

4 SHEETS-SHEET 4.

Witnesses;

CHARLES e. oimgris, OF NEW YORK,

N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO GENERAL ELECTRIC COMPANY, A CORPORATION 'OF NEW YORK.

SLOTTINGMAGHINE.

specifieatio'n of Letters Patent.

Patented Feb. 9, 1909.

Application filed October 3, 1902, Serial No. 125,766. Renewed April 6, 1906. Serial No. 310,264.

To all whom it may concern:

Be it knownthat I, OHARLns G. CURTIS, a citizen ofthe United States, residing in the borough of Manhattan, city of New York, State of New York, have invented a certain new and useful Improvement in Slotting- Machines, of which the following is a specification.

My invention relates to machines for cutting curved slots across the peripheral surfaces of rings or disks or segments thereof,

more particularly to form the vane spaces of steam turbines of the Curtis type. It is an improvement upon the machine invented by Frank M. Leavitt 'and myself upon which application for patent was filed April 30, 1901 (Serial No. 58,129.).

The object of the present invention ,is to produce a machine ofthis character which will be more accurate..=inoperatiom'will'have less lost motion and wear, and will'be capable of being run at a higher speed.

7 In the drawing, Figure 1 is a plan view of amachine embodying my present invention;

Fig.2 is a side elevation of the same; Fig.3,

is an end elevation of the same taken from the end to which powerisapplied; Fig. 4. is a vertical-section ofthe headtof themachine taken lengthwise through the tool s Fig.5 is a front-end elevation of the. ead of the machine; Eigs..6'and 7 are Views respecive y of the cams ,andassociated partsifor controlling the orbital and axial movements ofthe tool,-taken on lines 6...6 and 'Z--7 in Fig. 4;; and Fig, -8 is a perspective view of the plates for holding. the tool spin le against longitudinal movement while the tool is cutting'the work, these plates being shown as separated.

1 is the frame carrying the cutting mechanism, from which extends a bed 2 carrying the 'work to be cut. The work-carrier is divided into two parts, 3, 4, the former supporting the shaft of the index plate 5 which is vertically adjustable thereon. The work is clamped to the index plate, The art 4 of the car 'er has a laterally adjustab e clamp 6 whic clamps the inner edgeof the index plate so as, to fix'the position of 'the work with relation .toxthee' tt g ool. The. parts 3 and 4 of the carrier are connected together rier is given an intermittent feed movement indl 1 The link 19 is so as to advance the work after each cut by a screw 9, which is intermittently rotated .by

rocation. The sleeve 12 is in turn mounted eccentrically in a still larger sleeve o'r barrel 13 in which it has a movement of rotation only, while the outside sleeve or barrel 13 is supported by and rotated in bearings 14 mounted on the frame 1. The barrel 13 carries a gear 15 connected by suitable gearing with the driving pulley 16 by means of which the barrel is rotated, and also the sleeve 12 and tool spindle 11, causing the tool spindle by reason of its eccentric mounting to describe a circular path about the center of rotation. The sleeve 12 is connected with the barrel 13 so asto be turned bodily thereby, and at .the same time this connection permits the sleeve to be turned in the barrel so as to move the tool spindle towards and away fromthe center of rotation and thereby vary the path described by the tool in the Workto the extentdesired froma true circle.

The rotarymovement of the sleeve within and independent of the barrel iscontrolled by a cam and prod es-t e orbi al m m n .0 .the tool as described in theapplication for patent already referred to.

By mounting the tool spindle eccentrically inasurrounding sleeve carried by the rotating barrel and varying the curvature ofthe path described by the tool by turning this sleeve, ar'nore rigid and desirable construction is produced than that described in said application. To this end, the sleeve 12 on its end away from the cutting tool is provided with an-arm 17 which is connected by pivoted links 18, 19 (Fig. 6) with a plate 20 bolted to the adjacent end of the barrel 13. rovided with a roller 21 which engages a ed cam groove 22 formed in a plate 23 supported by thestationary housing 24. This orbital cam 22 is properly shaped so as to produce the desire rotary movement of the sleeve 12 in the barrel 13.

The axial movement of the tool spindle to maintain the cu ting "edges of the tool .normall-to the cut notwithstanding the .va riation of its movement fiom a true circle,

is produced by a stationary cam 25 also supported by the housing 24. The plate 20 which is bolted to the end of the barrel 13 is connected with a block 26 mounted on the tool spindle 11 and turning therewith by means of pivoted links 27, 28 (Fig. 7), the latter carrying a roller 29 which engages the axial cam 25. The block 26 while turntion referred to.

F or reciprocating the tool spindle so as to retract the tool during the return portion of its revolution and to hold the tool forward in the work while cutting, I provide special devices. Upon the outer end of the tool spindle is secured-a coupling block 31, to

which is connected an arm 32 by means of a link- 33 and ball-and-socket joints. The connection of-the link'33 with the block 31 is'made approximately in line with the center of rotation of the barrel 13. The arm 32 extends from a rock-shaft 34 supported in bearings transversely upon the frame 1. The outer end of the rock-shaft 34 has a shorter arm 35 carrying a roller engagin with a cam oove36 in a plate 37 mounte upon a sha t which is driven by gearing from the drivin tracting cam 36 is properly shaped so as. to turn the rock-shaft 34, throwing back the arm 32 and pulling back the tool spindle after the tool has completed its out. The tool is thereby caused to clear the work on the return portion of its revolution, after which the retractin cam acts to push forward the tool spin le so that the tool will engage the work for a new cut. To hold the tool forward in the work without relying upon the retractin cam and the connections between it and t e tool spindle in which there will be more or less ,lost motion, the coupling block 31 on the outer end of the tool spindle has secured to it a guide plate 38 projecting radially therefrom and working between plates 39, 40, supported in a stationary. housing 41. The separation of the plates 39, 40, is adjusted by means of wedges 42, &3, moved by screws. The plate 40 receives the backward thrust of the tool spindle, and it is important therefore that its position should .be accurately adjusted and rigidly fixed. This is accomplished by means of the wedges i2, 43. The guide plate 38 and the thrust plate 40 have such a width that they are in engagement only pulley 16. The tool rewhile the tool is cutting the work and long enough before and after to make the engagement certain and effective.

The operation of the machine will be understood without further description.

What I claim is 1. In a slotting machine, the combination with a main rotating element, of an auxiliary rotating-element, carried eccentrically by the main rotating element, a tool spindle carried eccentrically by said auxiliary rotating element and means for rotatively-adjusting, the auxiliary element within the main element operated automatically by the rotati on of the parts, whereby the path described by the tool spindle will be automatically varied from a true circle by the rotative adjustment of said auxiliary element, substantially as set forth.

2. In a slotting machine, the combination with a main rotating element, of an auxiliary rotating element carried by the main element and rotatively adjustable therein,

a tool spindle carried eccentrically ,by the auxiliary element, a connection between the main and auxiliary elements, whereby the latter will be driven rotatively by the former, and means for automatically varying said connection as the parts rotate so as to adjust the auxiliary element rotatively in the main element, substantially as set forth.

3. In a slotting machine, the combination with a main rotating element, of an auxiliary rotating element carried by the main element and rotatively adjustable therein, a tool spindle carried eccentrically by the auxiliary element, a link connection between the main and auxiliary elements, whereby the latter will be driven by the former, and a cam coactin with said link connection to lengthen and shorten the distance between its ends, whereby'the auxiliary element will be ad'usted rotatively in the main element and t e curvature of the path described by the tool spindle will be varied, substantially as set forth.

4:. In a slotting machine, the combination with the rotating barrel, of the sleeve mounted therein, the tool spindle carried eccentrically by the sleeve, and the orbital cam and connections between the barrel and sleeve for rotatively adjusting the sleeve within the barrel, substantially as set forth.

5. In a slotting machine, the combination j Substantially as set forth.

ture, of alink connection between the tool spindle and the rotating element which car-' ries it, and a cam-engaging such connection and lengthening and shortening the distance between its ends for rotating the tool spindle axially within its rotating carrier, so as to maintain its cutting-edges normal to the cut,

to retract the tool, substantially as set forth.

8. In a slotting machine, the combination with thetool spindle mounted eccentrically in a rotating support and having automatically eifectedorbital and axial a ustments,

said spindle being longitudinally movable in its support, of a retracting cam and a con nection between said cam and said spindle approximately in line with the center of ro-- tationfor efiecting the retraction of the* spindle by the cam, substantially as 'set forth.

9. In a slotting machine, the combination with the tool spindle mounted eccentrically in a rotating support and having automatically eifected orbital and axial adjustments, said spindle being longitudinally movable in a, f its support, of a retracting cam, avrockerarm moved by said cam, and a universally .jointed connection between said rocker-arm and said spindle approximately in line with the 1tlzenter of rotation, substantially as set ort 10. In a slotting machine, the combination,

with the tool spindle carried eccentrically by a rotatingelement. nd having automatically efiected orbital and axial ad ustments, said spindle being longitudinally movable in its support, of 'a retracting cam and connections for moving said spindle longitudi-.

'nally, and a thrust plate or block for holding said spindle in a fixed forward position during a portion of its rotation, substantially as set forth.

11. In a slottin machine, the combination with a, tool spind ecarried eccentrically by a rotating support and havin automatically eflected orbital and axial ad justments, and also 'movable longitudinally in its support, of a thrust plate or block adjustable by means of wedges, and a guide plate carried by said spindle which passes in front of said thrust p ate or block during a ortion of the revolution of the spindle, su stantially as set forth.

This specification signed and witnessed this 30thday of bept. 1902.

y, CHARLES G. CURTIS, Witnesses:

. JNO. Rosr TAYLoR, 'JQHN LOU IS Loreen.

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