US1250320A - Gear-cutting machine. - Google Patents

Description

A. KINGSBURY.

GEAR CUTTING MACHINE.

APPLICATION FILED OCT. 23. l9l2.

Patented Dem 18, 1917.

2 SHEETS-SHEET l- IINVENTOR 2: 2 ATTORNEY A. KINGSBURY.

GEAR.CUTTING MACHINE. APBLICATIOI FILED OCT. 23. IN]!- 1,250,320. Patented Dec. 18, 1917.

Z SHEETS-4"! 2- may A'noii ALBERT KINGSBURY, OF PITTSBURGH, PEN ELECTRIC AND MANUFACTURING COMPA NSYLVANIA, ASSIGNOR T0 WESTINGHOUSE NY, A CORPORATION OF PENNSYLVANIA.

GEAR-CUTTING MACHINE.

1 ,esogaeo.

Application filed October 23, 1812.

To all whom, it may concern:

lle it known that I, Alan-arr 1(INGHHUR, a eitizen ol the United States, and a residenl of Pittsburgh, in lhe county of Allegheny and State of Pennsylvania, have. ln-

vcnted a new and useful Improvement in (lear-(lutting \'Iaehines, ol which the fol: lowing is a pecification.

My invention relates to geaneutting niaohines, and it has special reference to such machines as are adapted lo cut double heli-- ad or herringbone gears.

The object of my invention is to provide an automat ie machine of the class above indicated that shall be adapted to cut herring-bone gears having relatively narrow slots between their righbhand and efthand teeth, with a relatively small loss of: material.

The advantages secured by the use ol double-helical o herring-bone gears are well understood, the fart that they are dillieult and relatively expensive to manufacture being the principal reason why theyhave not hitherto been more. extensively utilized.

According tomy present invention, I provide all automatic machine comprising a panof eutting tools which have traight line re eipri :atory movements and means for so adjusting axutfeeding a gear blank as to out a herring-bone gear having lrue involute leelh.

Figure. l, of lhe aeeompanying drawings, isa plan View of an automatic nraehine eon strueted in aeeordanee with my invention. Figs. 2 and 3 are elevations, at right angles to each other, of the work-supporting mem- B-and Fig. 4 is a vi w looking in the direclion ol the arrow L of Fig. l, sllOWing the driving motor and one of the shapers which l OIIU parts of the lnaelnne. Fig. 5 is an ele V vation of the worlesiuiporting member from the side opposite to that ol Fig. 3', lfu 6 is a diagramma ic view showing the mutant onilectiol'ib for the driving and feed motors and the, tool nn'te nets of llle maehine, and Fig. 7 is a detailplan view showing the relation bet ween certain ofthe op rating parts ol' the mach-hie. i

Referring to l i s. 1. to 5, inclusive, of the drawiifigs, the Inaeiiine, here shown comprises a bed plate lea pair of shaper pedestals 2 and 3, a driving motor 4', a worlesupport!ng member 5 and a l'eed motor (3.

The pedestals 2 and 3 have enlargements Specification of Letters Patent.

Patented Dee. 18,191

Serial No. 727,394.

or base projections 7 and 8 and are )lVolL- ally mounted about: centers 9 and 10,, eiug seeured to the bed plate 1 by bolts ll and 12 which extend througrli eireumterential slots 13 and 14: in the base projections, ,"lhfe arrangement of parls is such that the bolts may be loosened, the shaper pedestals ad--.

justed to any desired angle, as indicatedby protraetor dials 15 and 1G, and clamped in position by tightening lho bolts.

Two carriages 17 and lb are :nliustably supported upon the pedestals i), and l-l and are reriprocatcd hy the motor i to which they are respectively connected, on the one hand. by a runnccting rod ltl and a com-- bined gear wheel and eranleheml 20 which l'neshes with a motor pinion 2i and, on the other hand, by aeonneeting rod 22, a eolnlnned gear wheel and crank-heml 2? and an idler gear wheel 24: interposed between the gear wheel 23 and the pinion 2L.

The arrangement of parts is such u erine motor drives the gear wheels 20 and 23, at

the same. speed in opposite directions; The connections between the rods '1!) and and their respective eranleheznls are adjustable so that the extent oft-ravel of the gear wheel 24 and its shaft 27 are rotatively supported.

The. arrangement of parts is such that the driving eonneetions abo've described.

lfiaeb of the shaper earriages l7 and i8 is provided with a v shaper head 29, to whieh a tool holder 30 is pivot ally secured, and with :t uiagi'ietilllffor so tilting, the tool holder as to lilt the tool:

out of range of the worlg, while'the gear either or both of the. shaper pedestals iuay bef angular-l :Hljllstctl without'lnt'erferlngwith vertivally tidjiislhhle blank is being; hacked to its initial;position al'ter eaeh tooth slot is eoinpleted aslm-(ij al'ter pointed oul. The erank beads 20 and L3 are so Setrela} tively\ lo each other that the shape! ear riages alternate in their st roltes. lhe angle of inelination of these earriages to the axial line. of the gear determines the. piteh of the spiral of the leetlato he rnt.. 'lhis angle may be adjusted over comparatively wide limilsf The work-stipporting member 5 eomprises a bed 32, a spindle 3o, whieh is rotatively supported in bearings :37 and 3H, and a spindle carriage 39.

The bed 32 is supported on a vertical feed screw 33 aml is provided with guide projeetions 34 which operate in suitably slotted guide brackets an.

The spindle earriage Jil is providedwith a bracket. earrying lhe spindle bearings 37 amt-38in whieh the spindle is rolalively supported.

The spindlecarriage is transversely adjustable on the bed 3:2, its position being dependent upon'a teed screw ll.

The spindle. 36 is provided with a projertion l2 ronslitutinp a dividing head spind=le with which is assoi-iated indexing mechanism of any suitable type. .\s shown in the drawings, such indexing merhanism comprises a worm wheel lit, an index plate. 4.4; which is serured to said worm wheel lit. and an index pawl 45. The worm wheel 43 is rotatively mounted on the p'rojertion 42. the index plate 44 being secured to, aml forming a. part ol, the worm-wheid. and the index pawl 45 is splined to the projeetion 42 and is baclted by a spring 46. so that it.

may be moved longitmlilially ot' the projeetion but is foreed. to turn with the spindle. The spindle 36 is rotated when a pin projeetion 47 of the index pawl 45 engages a hole in the. index plate 44. since an operative conneetion is thus est ablished from the worm wheel 43 to the spindle. The worm wheel :3 is driven by a worm 48, which mounted on in extensible shaft composed of adriven member l9 and a tubular driving, member 50 operati-vely eonneeted to the *feed motor ll by neans of a gear wheel 51 and a motor pinion 52. The driven member ofthe shaft te hgi iyopes into the tubular driying member in a Well known manner,thereby permittinfi'the neeessary transverse adjnstlite-at: of the spiml'le earriagetlii.

The vertical fee-(l' sm' e\v l-l3 on vhieltit-he earriage '32 is mounted, is provided with a worm wheel 53 which meshes with a-yvorm 54, a handfyvheell 55' being secured to the opposite end of a shaft 56 from the worm 54 and adapted, when operated, to tnrn' 'the feed serewfi A lmoek-ont'lever 57 is pivotnll support.- ed at 58 on a projection 59 of the ed 32 and is held in the position in which it is shown in Fig. 2 of-the drawings, by a spring-( twee that it is free to move; in one direction, in oppositionto the spring, but is prevented by eot-iperating stop projections 61 from 'mov ing farthest-in the opposite direction.

to slowlyfeed the s ward the knockout lever 57. the knock-out.

lever is merely pushed aside by the flange (iii, but. when the spindle earriage is moving in the opposite direction, the engagement between the flange (tit and the ltnoeli-ont lever l'orees the pawl 45 outward, in opposition to the spring to, thereby releasing the. pin projeelion l7 from the index plate ii and permitting' the gear wheel :33 and the index plate to be rot atively moved indepemlently ot the spindle until the pin prodeetion 47 falls into the next hole in the index plate.

.\n v other suitable automatir indexing, arrangement may, of roin'se, be employed within the spirit aml srope of my invention.

As shown in Fig. 5 of. the drawings, an

auloniatie eontrol switehitii is mounted on= the spindle bed 32 amt is actuated atpredetermined limits in the travel at the spindle earriage 39 by adjnstable stops 65 and 66. The switrh eomprises an insulating face plate ti? having a pluraliify of stationary eon-tart members (58 secured toits surface, and a movable contact. member 69 which is pivotally supported at 70 and constrained, by means of a spring 71, to occupy the one or the other of two positions a and b. The switch positions are determined by stops 72.

Referring to Fig. (3 of the drawings, the t'eed motor ti comprises an armature 73 and a tield magnet winding 74, and is provided with tield-regulating resistors 75 and 76 and an armature resistor 7?.

The motors 4 and (5 are supplied with enorgy, from any suitable sonree, through line eondurtors 78 and 79.

The operation of the machine is as follows Assuming that a gear blankB is firmly supported at the end of the spindle-36 and hasa suitable slot 81 out in tt:s eylindrieal.

surface to separate the two parts of the gear; that the spindle carriage 15 adjusted to the bottom of the desired tooth slots in the.

gear, the, motor} may be started to set the tools in operation, and the motor 6 started fromthe feed motor 6,

pindlo earriage away,

The shaper tools, they move in their working strokes inwardly toward the cener 01'. median slot 81 of the blank, will, of course, start to cut the gear blank at only two points which lie adjacent to the median slot. ,These initial cuts are evidently very short. However, as theoperation continues and the spindle carriage progresses and the top of the spindle is rotated bi-ickwarclly by means of the reduction gearing, the tools 'will gfaduallycut longer and decfner slots until slots of full depth extend 'tlQ entire widthpf the blank.

The stop 66 is so placed as to actuate the movable switcharmfii when the gear blank has so far progressed that the first tooth slot is complete, the arrangement of parts being such that the flange 63 of the index pawl haspassed the'lmoelcfout lever 57.

When the stop 06 engages the upper end of the movable switch arm 69, it is thrown from the position a in which it illustrated. to the position 71.

- In position a, the circuit connections for the feed motor are completed as follows: from conductor 78, through armature ro sister 77, a conduclor a pair of conlact members 83-which are bridged by one branch 84 of the movable switch arm a conductor 85, the motor armature 73, eonductor 86, a pair of contact memlnn-s 87-- which are bridged by the opposite branch of the a1'1nand a conductor 88 lo the line conductor 79. A field circuit established from the conductor 78 through the field regulating resistor 7F, the field magnet winding ('4, a conductor 89, contort fingers 90 and 87 and the oonrlnrtor 88 to the line conductor 79. 7

When the switch occupies its position I the current traverses lhc motor :nfnnrture 73 in. the reverse (llrtClhfll, and the resistor 76 is introduced into the field circuit Consequently, the motor reversed and its speed is materially illCj eased. Furthermore, a circuit is established from the onductm' through contact members and 531; a conductor the magnet coils 31, a comluctor 93, contact members 94 and 87 and the eonductor S8 to the line conductor 79. Thus, when'the feed motor ls reversed the magnets 31 1 are energized.

As hereiubeliore pointed out. the magnets EH, when energized, raise'the shapvr tools sulliriently to clear the gear blank.

the gear blank and the spindle carriage are moved rapidly toward the feed niottn', the index pawl is trippr-l' il, as above indicated, and permits the pin projection 47 toinovr llll'H the next hole in the index vial-cf e holes in the index plate are so s iaeed produce the necessary rotal'ive adjust- MM 152 near blank relatirt-vl'o the feed properly spacing the tooth me in: I is therefore evident that, as the adjustment is automatically effected and,

when the stop engages the arm (59 of the control switch, the feed motor is again 71} reversed, and the gear blank is slowly fed through another culling stroke.

' The structure shown inthe drawings and set forth in the foregoing description may be variously modified by person's skilled in 75' the art to which my invention relates, and 1 its'clements may be replaced by equivalent parts, without departing from the scope of my invention. It is thereforeto be understood that any invention coniiprehends' all. such modifications and changes and is lun.-. ited only by 'the scope of the appended A claims. l

I claim as my invention:

l. ln :1. gear cutting mnchilu':, the oombi.- nation with a rotary spindle lo which a gear blank may be secured, of means for simultnneously imparting a transverse and rotatiw inovonu-nl to the spindle. and cutting tools adapted to cut alternnlr-ly from oppo 91) site Hillt'S of the blank toward lhe center.

2. In a gear culling nun-lone the combination with a. rotatable gear blank carrier, of menus for imparting a transverse movement and a rot-alive nmvementto the carrier, 95 and a pair of reciprocating cutting tools adapted to cut alternately from op1')osite sides of the blank toward its central plane.

3. In a gear-cutting machine, the combination with a rotatable rear blank carrier, and means for innoarting, a transverse 1novelnent and a rotntive movement to the carrier, or a pair of reciprocating cutting tools adapted to out alternately from opposite sides of the blank toward'its central plane, and means for reversing both movements of the blank (-arr ier at predetermined limits in the ll'flllH QlSell'llOVOTllGlll thereof.

4. In a gear-cutting machine, the combination with a rotatable gear blank carrier, 11.0 means for importing a transverse movement and a rol'ativemovement. to the carrier, and a pair of reciprocating cutting tools adaptedto outalternately from opposite sides of the blank toward its central plane, of means for reversingboth movements of the blank carfit)! at predetermined limits in the trans verse movement thereof, and means for pro-. during; a relative adjustment of the carrier (luring;- eavh return stroke.

5. in :1 p'varwutting nnwhine, the combination illl a rotary blank carrier, :1 fer-d law for producing a transverse .rnovtunent iherc i. means operativcly connected to the row for simullanemisly producing a to 1:; tative movement of the earrier, means for driving the feed screw alternately in oppt sitcdirectioma, and an automatic index moch anism for producing a rotativeadjustment of the carrier daring eaoh retnrn'stroke of the carrier, of a air of reciprocating tools cutting alternate y' from opposite sides of the blank toward the center.

6. In a ear-cutting machine, the combination witi a rotary bla'nk carrier, a feed screw for producing a transverse movement thereof,- means 0] )eratively connected to the screw for simultaneously froducing a rotative movement of the carrier, and means for driving the feed screw alternately in oppositedirections, of an automatic index mechanism ,for producingh rotative adjustment of tlieicarrler during each return stroke of the carrier, a pair of reciprocating tools cutting alternately, from opposite sides of the blank toward the center, and means for lifting thev tools out of range of the gear blank duringv the entire return stroke of the carrier.

7. In a gear-cutting machine, the combination with arotary blank carrier, a feed screu"for producing a transverse movement th ereof, means operatively connected to the screw for simultaneously producing a rotative movement. of the carrier, and means for drivingthe feed screw alternately in opposite directions, of an automatic index mechanism for producing a rotati ve adjustment of the earner during each return stroke of the carrier, a pair of shapers pivotally adjustable and having reciprocating cutting tools operating at an angle to each other in substantially the same plane, and means for operatively connecting the shapers, whereby they are adapted to cut alternately from o posite sides of the gear blank toward the central plane.

In testimony whereof, I have hereunto subscribed my name this 17th dayof Oct, 1912.

ALBERT KINGS'BURY.

\Vitnesscs:

Gonna E. MCGEE, B. B. Hnms.

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