US1790560A - Gear-tooth-finishing machine - Google Patents

Description

Jan. 27,- 1931. H. D. TANNER ET AL GEAR TOOTH FINISHING MACHINE Filed Nov. 26. 1927 7 Sheets-Sheet 1 HlQ/g/VVENTOH Q/YWP/l Br y w Jan. 27, 1931. H. D.-TANNER ET AL 5 0 .GEAii TOOTH FINISHING MACHINE Filed Nov. 26. 1927 7 Sheets-Sheet 2 INVENTUR Jan. 27, 1931. H. D. TANNER ET AL 1,790,560

GEAR TOOTH FINISHING MACHIIIIE Filed Nov. 26. 1927 7 Sheets-Sheet s 4 v g Haw/511E170 B, as. M

Jan. 27, 1931. NE ET AL 7 1,790,560

GEAR TOOTH FINISHING MACHINE.

Filed Nov. 26. 1927 .7 she ts-s eet 4 C9 gum/2 n. 119% M Anni/ r Jan. 27, 1931.-

H. D. TANNER ET AL GEAR TOOTH FINISHING MACHINE Filed Nov. 26. 1927 7 Sheets-Sheet 5 INVENTOH Jan. 27, 1931. H. D. TANNER ET AL 1,790,560

GEAR TOOTH FINISHING MACHINE I Filed Nov. 26. 1927 7 Sheets-Sheet 6 Jan. 2 7, 1931. H. D. TANNER ET AL 1,790,550

GEAR TOOTH FINISHI NG MACHINE Filed Nov. 26. 1927 7 Sheets-Sheet 7 f 1 I lmwron L Y H195 Patented Jan. 27, 1931 UNITED STAT S PATENT OFFICE KUBERT D. TANNER AN D ROBERT R. RABER, OF WEST HARTFORD, CONNECTICUT, AS-

SIGNORS TO PRATT & WHITNEY COMPANY, OF NEW YORK, N. Y., A. CORPORATION OF NEW JERSEY em-roorn-rmrsnme macnr'ms' Application filed November as, 1927. Serial No. 235,866;

This invention relates to a gear tooth finishing machine and in particular to a machine 'for shaving or taking a finishing cut over the tooth curves ofa gear by a tool moving in the direction ofthe rolling motion of the gears More particularly the invention relates to improvements in a machine of the type shown and described in the patent granted to Barnes No. 1,608,052, dated November-23, 1926.

An object of the present invention is to'provide a machine in which the gear being finished is mounted on a spindle oscillating about a fixed axis and in which the tool or tools are moved back and forth in a straight line in timed relation to the oscillatory movements of the spindle. v

Another-object of the invention is to provide a-cam locked to the spindle carrying the gear during the cutting portions of its oscillatory movements for efiecting the reciprocating movements of the tools, the cambeingformed so that the tools will pass over the profiles of the gear teeth to properly generate the curved tooth form.

Another object of the invention is to -provide means for effecting feeding movement of the tools during operation and indexing movements of the spindle when the tools are out of contact with the gear blank to pro 80 gressively cut the teeth during successive rotations of the blank.

Another object of the invention is to index the gear during the continued oscillatory movements of the spindle and reciprocatory movements of the tools, this indexing taking place while the spindle is rotating in one di-.

rection so that each of the gear teethmay be engaged successively by the tools during a revolution of the spindle without loss of time.

Another object oft-the invention is to provide vmeans associated with the indexing mechanism to move the gear a slight distance away from a tool when the tool has reached the end'of its cuttin stroke over the tooth profile so that when t e direction of rotation of the spindle and the movementof the tool is reversed the tool will not drag over'the finished surfaces of the gear teeth.

Another object is to effect the feeding movementsof the tools at the completion of .vention can each rotation of thespindle and ear and after a plurality of completerevo utions of the spindle, to discontinue operation of the machine. v

Another object-of the invention is to provide blank positioningmeans to properly locate the blank on the'spindle so that opposite sides of different teeth ma be finished simultaneously by opposed too s. Also associated with this blank positioning means is an interlock mechanism preventing starting of the I machine when the positioning means is in engaged pos1t1on, and prevent ng movement of the positioning means to its engaged position during normal operation of the machine.

Vith these and other objects ,in'view, our invention consists in the features of construction and operation set forth in the following specification and illustrated in the accompanying drawings.

In the accompanying drawings annexed hereto and forming a part of this specification, we have shown our invention embodied 1n an automatlc gear shaving machlne adapta ed for rapid production of duplicate spur gears, but it will be understood that the inbe otherwise embodied and that the' drawings are not to be construed as defining or limiting the scope of the invention,

the claims appended to this specification being relied upon for that purpose.

n the drawings;

Figure 1 is a front elevation of the coinplete machine made according to the present invention, parts'being broken away to more clearly show the construction.

Fig. 2 is aside elevation in section taken from the right hand side of the machine as seen in Fig.1.

Fig. 3 is a side elevation in section of the complete machine taken from the opposite side from that shown in Fig. 2

Fig. 4 is a front elevation of the tools and Fig. 6 is a partial rearelevationin secsleeve showing the locking bolt actuatingmechanism.

Fig. 10 is a longitudinal section through the spindle and showing the separating, indexing and locking mechanisms thereon.

Fig. 11 is a fragmentary front elevation in section taken on-line 1111 of Fig.2 showing the stop mechanism for the machine.

Fig. 12 is an elevation in section taken on line 12-12 of Fig. 2 showing the means for effecting feeding movements of the tools.

' Fi 13 is a plan view of the actuating member or the tool feeding means.

Fig. 14; is a side elevation in section of thei actuating means for feeding the tools, an

Fig. 15 is a plan view of the stopping mechanism taken on line 15-15 of Fig. 2.

In the above mentioned drawings, we have shown but one embodiment of the invention which is now deemed preferable, but itis to be understood that changes and modifica tions may be made within the scope of the appended claims without departing from the spirit of the invention.

Briefly, and in its broadest aspect, our ino vention comprises the following principal parts: First, a base; second, a sleeve rotatably mounted infixed bearings provided in the base; third, means to oscillate said sleeve through a predetermined adjustable angle; fourth, a work supporting-spindle rotatably mounted within said sleeve; fifth, means to index said .work supporting spindle relative .to the sleeve while the sleeve is oscillating and lock the spindle in indexed position; sixth, a cam fixed to and oscillating with said sleeve; seventh,-a slide mounted on the base reciprocated by oscillatory movementof said sleeve and cam; eighth, oppositelydisposed tool heads mounted on said slide and movable thereon toward and from each other; ninth, cam means to effect movements of said tool heads to effect feeding movements thereof relative to a gear on said work supporting spindle; tenth, means to actuate thetool feed- 7 ing means after each complete rotation of the spindle and 'blank; eleventh, means to stop operation of the machine after a predetermined cycle of operations; twelfth, means to separate the tools from the blank when they have completed their cutting movement; thirteenth, positioning means for the blank gear 16.

for correctly disposing the blank angularly relative to the spindle; and fourteenth, in-

terlocking mechanism between the positioning means and the operating means for the machine.

Referring more in detail to the figures of 1 v the drawings, we provide a base 10 having two fixed bearingsll therein. Adapted to freely oscillate within these bearings 11 is a hollow spindle or sleeve 12. To oscillate the sleeve an arm 13 is suitably secured thereto, its outer end being attached to a connecting rod .14. The opposite or lower end of the connecting rod 14 engages a crank pin 15 adjustably secured upon one face of a gear 16. Rotation of the gear 16 which is keyed directly to a horizontal driv ing shaft 17 will therefore oscillate the sleeve 12, the angular 'or oscillatory'movement of the sleeve 12 depending upon theradial position of the crank pin '15 in the To rotate the gear 16 and its shaft 17, which preferably are disposed within the lower partof the base 10, a motor 18 is provided. This motor 18, through suitable reducing gears 19 and an intermediate shaft 20, drives a pinion 21 on sleeve 22 engaging teeth formed on the periphery of the gear 16 carrying the crank pin 15; On the inter-.

mediate shaft 20 for driving the pinion 21 Y is a friction clutch 23, one member of which is on shaft 20 constantly rotated by the motor 18 and the other member is keyed to the sleeve 22. The pinion 21 is keyed or otherwise secured directly to the sleeve 22. A

.second clutch of the friction type 24 has one member rotating with the sleeve 22 .and

its companion member is maintained against rotation preferably by being fixed' rigidly to a part of the base 10. This clutch 24 when its members are in engaged position acts as a brake to stop rotation of the sleeve 22 and gear 16.

The friction clutches-23 and 24- are operated by a central member 25 movable on the sleeve 22 by a yoke member 26 keyed to a shaft 27 mounted within the base 10. The outer end of this shaft 27 is provided with an upwardly extending lever 28.' This lever 28 by means of a suitable-connecting rod is attached to a hand lever 29 plvotally mounted on the outside of thebase 10. From the above description it will ;be seenthat movement of the hand lever 29 to one operative position will engage friction clutch 23 to rotate the pinion 21 and thus 05011- late the sleeve 12. Movement of the lever 29 to its opposite operative positionwill engage friction clutch or brake 24-and thus quickly bring the machine to rest.

Within the hollow spindle'or sleeve is:

a work supporting spindle 30 to -which a gear W to be finished is adapted to beattached in any preferred manner as by means of the collet chuck 31 shown in Fig. 3. Ad jacent the work" securing. means and surrounding the forward end of this spindle is mounted a large cam 32.- This cam 32 isattached rigidly to thesleeve 12 but in that there are two oppositely disposed cam' portions. The particular contour of these cam portions will vary with the characteristics of the gear W being finished but in each instance the cam is so designed that the distance between points on these cam portions simultaneously engaged by rollers on the tool slide will be equal.

Means to index'the work supporting spindle 30 within and relative to the sleeve 12 areprovided adapted to angularly advance or rotate the. work spindle 32 and gear W relative to the sleeve 12 to permit operation successively upon each of the gear teeth being finished. This indexing means operates during the oscillating movements of the spindle 30 and sleeve 12 and will presently be described.

.Mounted in suitable horizontal ways 33 30 extending transversely on a member 34 secured to the upper surface of the base 10 adjacent theforward end of the work spindle 30 is a slide 35. This slide 35 is movable within the ways 33 which are disposed below and at right angles to the axis of the sleeve 12 and work spindle 30. Near the opposite ends of the slide are provided opposed heads 36 which are adjustable within slight limits along the slide 35 and adapted to be rigidly secured thereto in any adjusted position. On the heads-36 are mounted rollers 37 oppositely disposed and adapted to contact with the periphery of the cam 32 on the sleeve 12. Each cam' 32 for the sleeve 12 is so designed that during oscillation of the sleeve 12 and the work supporting spindle 30 it is simultaneously engaged by the rollers 37in all of its oscillated positions. Oscillatory movement of the. sleeve 12 and spindle 30 and engagement of the cam 32 with the rollers 37 on the slide 35 produces reciprocatorymovement of the slide 35 in timed relation\to oscillations of the sleeve 12 and gear W being finished.

Also mounted on the slide 35 are oppositely disposed tool holding heads 38 mounted for slidable movement toward and from eachother. For that purpose the tool holding heads 38 are mounted in ways 39 provided 38 have tool supporting devices adapted to hold straight edged upwardly and obliquely extending tools 40 respectively at their inner ends. The tools 40, as shown in Fig. 4, are

oppositely disposed so that they are adapted to engage and cut op osite sides ofgear teeth. on the blank s the gear W, and its spindle 30 are indexed between each complete oscillatory movement of the sleeve 12 the gear teeth will all be in contact with and will be cut by'the tools 40 during a complete revolution of the work spindle 30. The tools 40 engage the gear teeth near the extreme oscillated positions of the cam 32 and spindle 30. At the extreme oscillated points of oscillation of the spindle 30 and sleeve 12 the tools 40 have completed their cutting movement 7 and upon reversal of the spindle and sleeve move away from the'gear teeth. During the mid portions of the oscillatory movements of the sleeve 12 and spindle 30 both of the tools 40 are free from the gear W being finished. At this mid portion of the oscillatory movement of the spindle 30 and sleeve 12 while these parts aremoving in one direction the indexing mechanism operates .to'

index the spindle 30 relative 'to the sleeve 12 to present successive or adjacent teeth to the tools upon the following oscillation.

As it is desirable to takesuccessive cuts upon each of the gear teeth, means are provided to advance the tools 40 a very slight distance at the end of complete revolutions of the spindle 30 and gear W being finished. In the present embodiment of the invention the gear W being finished is adapted'to be indexed through four complete revolutions and its tooth curves are engaged by and cut by the tools 40 upon each revolution of the gear.

On the slide 35 at its opposite ends are mounted forwardly and horizontally extendingshafts 41. On these shafts 41 are mounted peripheral cams 42, their cam contours being in contact with the outer ends of screws 43 threaded into the tool holding heads 38. Rotation of the cams 42 will therefore advance the tool holding heads 38 towards each other against the pressure of springs 44 normally holding the tool heads 38 as far apart as possible. The shafts 41 carrying the feed cams 42 are adapted to be rotated simultaneously and are for that purpose provided at their forward ends with sprocket wheels 45 over which -a chain 46 passes. Rotation of one shaft 41 will therefore rotate the other in timed relation thereto.

To'rotate the feed cams 42 slowly and in a step-by-step manner at the end of each rotation of the spindle 30 the shaft 41 on the right side is provided at its, rear end with a gear 47. This gear 47 as the slide 35 moves toward the right engages a tooth 48 formed on a plate secured to the free end of a horizontal arm 49 mounted for oscillation about a vertical axis. By striking the tooth 48 the gear 47 and shaft 41 are thus rotated. through a small angle thus rotating the .feed cams 42 a similar amount. The arm-49 is held out of the path of movement of the gear 47 except when feeding movement of the tools 40, at the end of each rotation of the gear W, is required. In order to oscillate the arm 49 to efi'ect rotation of the feed cams for the 5 tools at the completion of each rotation of the gear W being fin'shed the main drive /shaft- 1 17 has keyed the to a small crank 50. To. the crank 50 is attached a connecting rod 51.,

I the opposite end-of which is attached to an m oscillating lever .52 carrying a pawl 53. Betation of the main shaft 17 will therefore oscillate the pawl 53 which engages the teeth of a ratchet wheel 54 and causes the ratchet wheel 54 to be advanced one tooth for each rotation of the main shaft 17. 'A ratchet wheel 54 is used having as many teeth as the gear W being finished so that one complete rotation of the ratchet wheel 54 will take place upon a complete, rotation of the gear W being finished. The ratchet wheel 54 is on the forward end of a shaft 55 carrying a disk 56 having a notch 57 in its periphe Rotation of the disk 56 therefore allows t e arm 49 on a shaft 59 to be oscillated by a spring 60 when the notch 57 is rotated to a position opposite a small lever 58 on the lower end of the vertical shaft 59 to which the arm 49 is fastened. As soon as the slide 35 starts its movement toward the left the arm 49 is swung out of engagement withthe gear 47 so that the gear 47 and shaft 41 are not reversed, By these means the cams 42oare slowly rotated and thus advance the tools 40 to' successively advanced cutting positions.

T As shown in Fig. 5' the feed cams 42 have two.

series of peripheral portionsbf successively increased radius. During a half rotation of these cams which takes place during the com: plete operation upon a gear the tools will 40 be advanced to four different advance positions. 7 I To properly position the gear W to be finished on the spindle '30 so that the sides of the gear teeth will be engaged by the tools 40 a special positioning device is employed.

This comprises a vertically movable plunger 7 61 suitably mounted within the slide 35 and' having a forked up er end adapted to engage opposite sides 0 a gear tooth on the gear 5 W. A spring 62 normally holds the plunger 61 downward and it is adapted to be forcedupward by a rod 63 having rack teeth along one side engaging a segment of a gear 64 on a forwardly extending shaft 65.' As the T 5 65. To actuate the shaft 65 to force the operation of the machine, interlocking means are provided disposed between the operating lever 29 for the machine and the plunger operating lever 69. On the operating lever 29 is a'short arm to which vertically movable link 70 is attached, the opposite end of which isslotted. A stud fastened in the base 10 engages the slot and thus, permits sliding movementof the link 70. A bar 71 pivot: ally connected to the lever 69 on the forward end of the shaft 65 for actuating the plunger 61 is supported at its opposite end for horizontal slidable movement when the shaft 65 is oscillated. The outer end of the bar 71 extends into the path'of movement of the 7 0 operatedv by the operating lever 29 when the plunger 61 is in its upper position. The operating lever 29 therefore cannot be operated. When the plunger .61 is down and the operating lever 29 isoscillated to start the machine the link 70 extending past the path of movement of the bar 71 prevents the plunger 61 beingraised.

In order to index the work spindle 30-to present the gear teeth of the gear W being finished successively to the tools '40 without loss of excess time, the indexing motion of the spindle 30 is effected during the oscillatory movement of the spindle 30 and its sleeve 12. During the mid portion of the oscillatory movement of the sleeve 12 and work spindle 30 both of the tools 40 are'entirely free from the gear W being finished. It is during this portion of the cycle of operations that the indexing is effected. As the spindle 30 and sleeve-12 are oscillating in one direction and reach substantially their mid position the no spindle 30 is moved angularly relative to the sleeve 12 an amount to present successive teeth to the tools 40. While the sleeve 12 and spindle 30 are oscillating in the opposite direction a part of the-indexing mechanism is movedto a position so that no indexing of the spindle takes place.

To effect the indexing movements while the spindle 30 is being oscillated in one direction but not in the opposite direct-ion the indexing and spindle locking cams are mounted on a swinging frame 75 mounted within the base 10. -To oscillate this frame 75 a. drum cam 76 is mounted on a shaft 77 in alinement withthe shaft 17 on which the gear 16 i sm'oiinted. A crank arm 78 connected to the'ccentric pin 15 is keyed to the shaft 77 at one end so that thecam 76 is rotated at the same speed as the gear 16. The cam 76 is provided on its periphery with a groove as shown in- Fig. 2 so and before the. spindle 30 is oscillate that with each rotation of the cam 76 a downwardly extended arm 79 keyed to the shaft 81 is oscillated back and forth. A roll 80 formed on this arm 79 engages the groove in the cam 76. The frame 75 is keyed to the shaft 81 so that the frame 7 5oscillates back and forth in 84 having spaced notches 85 cut into its periphery corresponding in number to the number of teeth in the gear W being finished.

One of these notches 85 is engaged during the cutting periods of the oscillatory motion of the splndle 30 by a locking bolt 86 on a plate 87 slidable radiallyin anarm 88 carried by and oscillating with the sleeve 12. While the plunger or bolt 86 isin one of the notches 85 of the index plate 84 the work spindle 30 will be oscillated with the sleeve 12.. The cutting action of the tools 40 takes place during the portions of the oscillatory movement of the sleeve 12 and spindle 30 while this locking bolt 86 is engaged-within a notch 85. To withdraw the locking bolt 86 from the notch 85 the inner end of the member 87 carrying the bolt 86 is provided with a roller 89 entering a small cam groove 90 ina plate 91 surrounding andfreely rotatable on a hub formed on the plate 88. Angular movement of this plate 91 to eflect disengagin and engaging movement of the bolt 86 is e ected by a slidable bar 92 in the arm'88 having rack teeth engaging gear" teeth on the plate 91. Movement of the bar 92 to disengage the bolt 86 is obtained by contact with the cam 83 on the swinging frame 75 by a roller 93 on the lower end of the bar 92. Movement of the bar 92 in a direction. to engage'the bolt 86 in a notch 85 is accomplished b means of a helical spring 94. One end is ast-to the arm 88 and the other end to a stud on the bar 92 extending through an elongated notch in the arm. The cam 83 by-whlch the bar, 92 is moved upward is positioned and formed so that itwill unlock the bolt just before the indexing movement of the spindle takes place and will permit locking movement of the bolt as soon as the indexingis com lpte enough for the opposite tool 40 to engage another gear tooth. Fig. 9 'shows'the position of the spindle locking mechanism during that portion of the spindle oscillation during which the indexing is taking place.

The means to index the spindle 30 relative to thesleeve 12 comprise the following 'mech anism separately shown in Fig; 8. This mechanism is mounted on the sleeve and co operates withcams mounted on the swingi-ng framegf. The arm 88 previously referred to in connection with the operation of the ;locking bolt' has-an arm 95 rotatably mount-.

pivotally mounted pawl 96 engaging at its outer end a notch 85 in the index plate 84. Movement of this pawl 96 while engaged in a notch 85 by oscillating movement of the arm 95 relative to the sleeve 12 and the arm 88'fast thereon advances the spindle 30 and the gear W to a new indexed position. This movement of the pawl 96 takes place while the sleeve-12 is in approximately mid position and is effected by acam 97 on the swingmg frame 75. A lever- 98 pivotally mounted on the arm .88 about stud 99 has a roller 100 at its outer end contacting with the cam 97 when the swinging frame 75 is in one of its oscillated positions' The opposite end of the lever 98 is slotted and adjustably attached to an adjustable reach arm 101, the

opposite end of which is attached adjustably to an arm 102 pivoted about the axis, of the pawl .96. A spring 103 surrounding the pivot of the lever 98 normally holds the pawl 96 toward its outer position againsta stop 104 formed on the arm95, a pin 105 onthe lever 102 bearing against the stop when the pawl 1s in its outer position. As the parts on the sleeve 12 are moving in the direction indicated by the arrow in Fig. 8 but before with the pawl 96 engaged in a notch 85 of the index plate 84 forces the arm 95 carrying the pawl 96 to move relative-to the sleeve 12 and 'thus index the spindle 30. The first movement of the lever 98 contacting with the cam 97 oscillates lever 102 about the center forming the pivot for the indexing pawl 96 and.

this forces the paw F96 into a notch 85. As :plon as the pawl 96 has engaged a notch 85 e theaxis of the sleeve 12. By adjusting the pivotal connections at the ends of the connecting rod 101 this movement of the arm95 and the pawl 96 which rotates the index plate 84 can be widel adjusted.

To prevent t e tools 40 dragging over the finished surfaces of the gear teeth on the oscillato movement of the, spindle 30: and gear, during the first portions of their arcs of movement, means are provided to very slightly oscillate the spindle 30 at the extreme end of its oscillatory movement in a direction to slightly separate the-engaged tool 40 from the gear W. This movement takes place before the slide 35 carrying the tools 40 starts on its rearward path. An arm 106 keyed to the sleeve 12 and-preferablyforminglthe sup-- of the arm'88 bgether with the locking bolt 86 and associated parts permits a correspondpawl 96 and its arm 95 are rotated aboutingly sli'ght angular movement ofthe spindle I 30'and gear W. Inorder to move the ann .88 from one adjustable stop or abutment 107 to the other at the extreme oscillated positions of the cam 32 and spindle 30 a lever 108 is pivotally mounted on the arm 106, its outer end being adapted to engageabutments 109 secured rigidly to the frame or base of the machine and suitably spaced apart. This is shown in Fig. 7 from which it will be evident that at each limit of oscillation of the sleeve 12 and parts oscillating therewith the lever 108 will be oscillated about its pivot in one or the other direction. Pivotal movement of the lever 108 moves a slidable member 110 retained in the arm 106, this movement being effected by means of gear teeth formed'on an arm of the lever 108 and on theslidable memher 110. The slidable member 110 is disposed radially of the plate 106 and is connected to a slidable member 111 in the arm 88 by a pin 112. By means of this pin connection 112 between the slidable members 110 and 111 the members 110 and 111 may be moved angularly relative to'each other. The member 112 is disposed within the arm 88 slightly obg5 liquely relative to radial lines so that movement of the members 110 and 111 inward and outward will angularly move the arm 88 relative to the member 106 fast-on the sleeve 12.

Themovement of the arm 88 relative to mem- I0 her 106 is limited by the abutment 107 which may be slightly adjusted. The abutments 109 are resiliently forced forwardly within casings 113 by springs 114 and when forced inwardly take up positively shoulders 116. With the sleeve 12 and spindle oscillating in the direction shown by the arrow in Fig. 7 when the lever 108 reaches the abutment 109 it forces the abutment 109 inward and when this abutment takes up \0 against the shoulder 115 the lever-108 is oscillated slightly. This slight movement of the lever 108 releases the sliding blocks 110 and 111 from their locked position with the mem-' her 106 forced toward one of the stops 107 on member 88. The abutment 109 then springs outward and oscillates the lever 108 to force the members 110 and 111 to their opposite position. This relatively moves the member 106 ,angularly of the member 88 and rotates the spindle in a direction to separate the gear W from the engaged tool 40. v

To stop operation of the machine when the gear W being operated on has been completely finished, means are provided to move the main starting lever 29 to. its inoperative position. 011' the shaft carrying the notched disk 56 is a pinion 117 engaging a gear 118 of larger size on a short shaft 1119 below the shaft 55. The ratio between the gears 117 and 118 is equal to the number of complete rotations of the gear W being finished required while being operated on by the tools 40.-'The shaft 119 will therefore make one complete rotation during the cycle of'operations of the machine. On the fortate the shaft 17 and thus actuate the mechaward end of this shaft 119 is a disk 120 having a pirgjection 121 extending from its rear face. en operations on the gear have been completed this projection 121 forces a bolt 122 rearward against a spring by means of rod123. Movement of this bolt 122 releases. a spring pressed lever 124 on the shaft 125 to which themain operating lever 29 is keyedso that this lever 29 is moved to its inoperative position, thus stopping the machine. The

position of the parts shown in Fig. 2 is that after the lever 29. has been moved to'inoperative position. Movement of the lever 29 to start the machine resets the bolt 122 and memher 124. A detent 126 having two notches resiliently retains the operating lever 29 in its operative and inoperative positions b en gagement with the notches of a small p unger 127, The detent 126 is rotatably mounted adjacent the member 124 and is angularly moved by movement of the lever 124 throu h a pin 128 on the d'etent being engaged by t e sides of a notch formed in a plate 130secured to the lever'124.

To facilitate manual operationof the machine during preliminary adjustments, the shaft 17 is provided with a sprocket wheel 131 over which passes a chain 132. This chain 132 passes over a smaller sprocket wheel 133 on a shaft or stud 134 conveniently lo- 95 rated on the front of the machine. A hand wheel 135 keyed to rotate with the sprocket wheel 133 enables an operator to slowly ronism of the machine. V To adjust the machine for difierent diameters of gears W the thickness of they member 34 carrying the slide 35 may be. chosen to position the rollers 37 and tools 40 correctly relativelyto the cam 32 and blank W. The amount of oscillationgiven the sleeve 12 and spindle 30is adjusted by the crank 15. To

control the angular movement of the spindle 30 relative to the sleeve 12 forindexing the blank 'W the position of the arm 101 is Changed. It will be understood also that the index plate 84 will have notches ual to, or a multiple of,, the number of teet .to'be' cut in the blank To positively hold the indexing pawl 96 within a hotch 85 a roller 96 may be mounted thereon and ads. ted to engage during a portion of the osc atory motion of the sleeve. 12 with a cam'97' on the swinging member 75. r

, Inoperation the sleeve 12 is oscillatedby 133 rotationof the main drive shaft 17 and the crank 'pin 15. By meansof the-cam 32 on the sleeve 12 the tool carrying slide 35 is reciprocated. A gear blank W mounted to oscillate with the sleeve 12 will therefore have its-teeth engaged and cutv by the tools 40 toward the ends of the oscillatory movement of thesleeve 12 in both directions.

Indexmg movement of the gear blank W V relative to the sleeve 12 to present-successive teeth to the tools 40 takes place with the tool, slide 35 approximately at its mid-position and while the tools are out of contact with the gear blank. This indexing movement is accomplished by the mechanism shown in Figs. 6 et seq. In order that'indexing movements may not take place on each oscillatory movement of the sleeve 12 the actuating mech-f anism comprisin the cams carried by the swinging frame ?5 are moved. into and out of operative position in timed relation with the oscillatory movement of the sleeve 12.

- This is accomplished by the cam 76 rotated by the main drive shaft. With the frame 7 5 rying the gear blank is indexed.

in its inoperative position the sleeve'12 0scillates from one extreme position to the other without indexing the gear blank and itsspin- 'dle 30. On the reverse oscillatory movement of the sleeve 12the frame 75is moved into operative positionso that the spindle 30 carto cut the teeth upon several successive in dexingmovements of the blank W. 'As soon as a complete indexing movement of spindle and blank takes place the feed earns 42 are rotated through acportion of a revolution so that each successive rotation of. the blank will serve to cut the teeth additional amounts.

-'- When several complete indexing movements have taken place, the mechanism is stopped preparatory to removing the finished gear and ounting another blank in position. What we claim is: v

1. A gear finishing machine comprising-in combination, a base, a gearsupporting spindle mounted for oscillation on a fixed axis thereoma cam onisaid spindle adapted to be actuatedtherewit'h, .a slide on said base reciprocated by said cam While said spindle is oseillating, tool heads on said slide on .opposite' sides of the blank axis and having toolsprovided with cutting edges upon their end tapes engaging a gar'on said spindle dnring the movement of said spindle and slide, whereby'oppositely disposed tools alter 'nately engage said gear upon each oscillation of said. spindle, and means to .'index-' said spindle.

2... A gear finishing machine comprising in combination, a base, a gear-supporting spindle mountedfor oscillation on 'a' fixed axis thereon, a' cam on said spindle adapted to be actuated therewith, a slide on said base recip'rocated bysaid. cam' while said spindle is site sides of the blank axis and having'tools provided with cutting edges upon their end faces engaging a gear on said s indl during extreme oscillated positions 0 sai s indle and cam, whereby oppositely dispose tools alternately engage said gear upon each oscillation of said spindle, and indexing means for" said spindle operative during the mid-, portions of the oscillatory movements of said spindles.

3. A gear finishing machine comprising in combination, a base, a gear supporting spindlemounted for oscillation on' a fixed axisl thereon, a c'am'on said spindle adapted to be actuated therewith, a slide on said base reciprocated by said cam while said spindle is oscillating, tool heads on said slide on opposite sides' of the blank axis and having toolsprovided with cutting edgesupon their end faces engaginga gear on said spindle',-Whereby oppositely disposed tools alternately engage said gear upon each-oscillationJof said spindle, and indexing means for said spindle operative during oscillation of said spindle and while said tools are out of engagement with said gear.

4. A gear finishing machine comprisingin combination, a base, a gear sup orting spindle'mounted for oscillation o fixed axis .thereon, a 'cam on said spindle adapted-to be actuated therewith, a slide on said base re-. ciprocatedby said cam while said spindle is oscillating, tool heads on said slide on oppo-, site sides of the blank axis and having tools oscillating, tool heads on said slide on oppothereon provided with cutting edges upon theirend faces, whereby oppositely disposed tools alternately engage said gear upon each oscillation'of said spindle, means to index said spindle, and means to advance said tool headstoisuccessive operative positions.

5. A gear finishing machine comprising in combination,.a base, a. gear supporting spin-- dlemounted for oscillation on a fixed axls'" thereon, a cam on said spindle adapted to'b e actuated therewith, a slide on said base reciprocated by said camwh'ile' said spindle is osc'illating, to ol li ads on said slidenn opposite sides ofthe' b ank axis and having'tools thereon provided with cutting edges upontheir end faces, whereby oppositely disposed tools alternately engage said gear npon'each oscillation of said spindle, means to index said spindle, and means to advance said heads to successive operative positions after each'complete rotation of the spindle,- 1 6. A gear finishing machine comprising in v combination, a base, .a gear supporting spin-l Idle mounted for oscillation ona fixed axis thereoma oam on said spindle adapted vto'be actuatedtherewith, aislide on said base reciprocated by said cain' while said spindle is oscillating, tool heads. on saidv slide, tools on 4 said heads .providedwith cutting edges upon their end faces arranged in opposed-relation ice blank axis and having tools thereon provided with cutting edges upontheir, end faces, whereby oppositely disposed tools alternately engage said, gear upon each oscillation of said spindle, means to index said spindle, and means to advance sa d tool heads to successive operative positions.

8. A gear finishing'machine comprising in. combination, a base, a gear supporting spindle mounted for oscillation on a fixed axis thereon, a cam on said spindle having opposed cam surfaces so disposed that distances between points in said cam surfaces upon a tangent to a circle coaxial with its axis of oscillation are equal, aslide on said base having rollers thereon contacting with opposite sides of said cam and reciprocated by said cam while said spindle is oscillating, tool heads on said slide on opposite sides of the blank axis and having tools thereon provided with cutting edges. upon their end faces, whereby oppositely disposed tools alternately engage said gear upon each oscillation of said spindle, and means to advance said tool heads toward each other at the completion of each rotation of said spindle.

9. A gear finishing machine comprising in combination, a base, a gear supporting spindle mounted for oscillation ona fixed axis thereon, a sleeve surrounding said spindle, means to oscillate said spindle and sleeve through predetermined angular distances, means to index said spindle relative to said sleevedurv axis thereon, a sleeve surrounding said spindle; means to oscillate said. spindle and 7 ing oscillatory movement of said spindle and sleeve, a cam on said sleeve adapted to be actuated therewith, a slide on said base reciprocated by said cam while said spindle and sleeve are oscillating, and tool heads on said slide having cutting tools thereon: provided with cutting edges upon their end faces disposed to engage opposite sides of difl'erent teeth.

10. A gear finishing machine comprising in combination, a base, a gear L supporting spindle mounted-for oscillation on a fixed axis thereon, a sleeve surrounding said spindle,

means to oscillate said spindle and sleevev through predetermined angular distances,

means to index said spindle relative to said sleeve during oscillatory movement of said spindle, a cam on said sleeve adapted to be factuated-therewith, a slide on said base disposed belowand movable at right angles to.

the axis of said spindle and reciprocated by said cam while said spindle andsleeve are inrcombi'nation, a base, a gear supporting spindle mounted for oscillation ona fixed axis, a sleeve surrounding said spindle, means to oscillate said spindle and sleeve through predetermined angular distances, means to lndex said spindle relative to said sleevedur ing oscillatory movement of said spindle and sleeve, a cam on said sleeve adapted to be actuated therewith, a slide transversely movable on said base reciprocated by sald cam while said spindle and sleeve are oscillating,

and tool heads adjustably mounted on said slide and having cutting tools thereon provided with straight cutting edges upon their end faces'and disposed to engage opposite sides of difl'erent teeth.

'12. A gear finishing machine comprising in combination, a base, a gear supporting spindle mounted for oscillation on a fixed axis thereon, a sleeve surrounding said spindle, means to oscillate said spindle and sleeve 1 through predetermined angular distances,

means .to indexv said spindle relative to said' sleeve during oscillatory movement of said spindle and'sleeve, a cam on said sleeve adapted to beactuated therewith, a slide on said base reciprocated by said cam I while said spindle and sleeve are oscillating, tool heads on said slide having cutting tools thereon provided with cuttingedges upon their end faces disposed to engageropposite sides of different teeth, and means to simultaneously advance said tools to successive operative positions.

13. Agear finishing machine comprising in combination, a base, a gear supporting spindle mounted for oscillation on a fixed sleeve through predeterminedangular dis: tances,mans to index said spindle relative to said sleeveduring oscillatory movement of said spindle, a cam onsaid sleeve adapted to be actuated therewith, a slide on said base disposed below and movable at right angles to the axis of said spindle and reciprocated by said cam while said spindle and sleeve are oscillating, tool heads on said slidehaving cutting tools thereon provided with cutting edges upon their end faces disposed to engage opposite sides of difierent teeth, of the gear on said spindle, and means-to "advance said tool heads toward each other to successive operative positions upon each successive rotation of said spindle. 14. A gear finishing machine compr sing in combination, a base, a gear supporting spindle mounted for oscillation on a fixed axis, a sleeve surrounding said spindle, means to oscillate said spindle and sleeve through predetermined angular distances, means to index said spindle relative to said sleeve during oscillatory movement of said spindle, a cam on said sleeve adapted to beactuated therewith, a slide on sa1d base reciprocated by said cam while said spindle'and sleeve are oscillating, opposed tool heads. on said slide having cutting tools thereon provided with cutting edges upon their end faces disposed to engage opposite sides of different teeth, and cam means on said slide to advance said tools heads .to successive operative positions.

"15. A gear finishing machine comprising in combination, a base, a gear supporting spindle mounted for oscillation -on a fixed axis, a sleeve surrounding said spindle, means to oscillate said spindle and sleeve through predetermined angular distances, means to index said spindle relative to said sleeve during oscillatory movement of said spindle and sleeve, a cam on said sleeve adapted to be ac tuated therewith, a slide transversely movable on said base' reciprocated by said camv while said spindle and sleeve are oscillating,

tool heads adjustably mounted on said slide and having cuttings tools thereon provided Withstraight cutting edges upon their end faces and disposed to engage opposite sides of different teeth, and means to advance said tool heads to successive operative positions.

16. A gear finishing machine comprising in combination, a base, a sleeve mounted for oscillation therein, a work supporting spindle coaxial within said sleeve, means to oscillate said sleeve, means to index said work supporting spindlerelative to'said-sleeve, a.

cam oscillated'with said sleeve, a slide on. said base reciprocated bymovement of-said cam, tool heads on said slide having straight edged tools thereon upon their end faces, and means to simultaneously move said tool heads on the slide towards each other during oscillatory movement ofsaid sleeve and reciprocatory movement of the slide.

17. A gear finishing machine comprising. in combination, a base, a sleeve mounted for oscillation therein, a work supporting spindle coaxial within said sleeve, means to oscillate said sleeve, means to index .said work supporting spindle relative to said sleeve, a

cam oscillated with said sleeve, a slide on said base reciprocated by said cam, tool heads on said slide having straight edged tool's thereon upon their end faces, cam means to simultaneously move said tool heads on the slide towards each other, and means to efiect operation of said cam'means at the end of each rotation of said spindle.

i 18. A gear finishing machine comprising in combination, a base, a sleeve mounted for oscillation therein, a work supporting spindle coaxial within said sleeve, means to oscillate said sleeve, means to index said work supporting spindle relative to said sleeve, a cam oscillated with said spindle, a slide on said base reciprocated by said cam, tool heads having straight edged tools thereon upon their end faces, and means to move said tool heads on the slide towards each other at the end of each rotation of said spindle and during oscillatory movement of said sleeve.

19. A gear finishing machine comprising in combination, a base, a sleeve mounted for oscillation therein, a work supporting spindle coaxial within said sleeve, means to oscillate said sleeve, index means mounted on said sleeve and work supporting spindle whereby said work supporting spindle may be indexed relative to said sleeve, and means positioned to efiect indexing movement of said work supporting spindle relative tdsaid sleeve while said spindle is rotating in one direction, said last-mentioned means being moved to ihoperative position during. rotation of said spindle and sleeve in the opposite direction.

- 20. A gear finishing machine comprising whereby said work supporting spindle. may be indexed relatlve to said sleeve,.means posit1oned to effect indexing movement of said work supporting spindle relative to said tating in one direction, and cam means to move said last mentioned means to inopera-- tive position when said spindle and sleeve are moving in the opposite direction.

21. A gear finishing machine comprising 1n combination, a base, a sleeve mounted for oscillation therein, a'work supporting spindle coaxial within said sleeve, means t oscillate said sleeve, index means 'mounte on said sleeve and work supportin spindle whereby sa1d work supporting spin e may be indexed relative to said sleeve, a swinging frame, cams on said frame fcoacting with said means on said sleeve and spindle to efiectsaid index: ing movements, and means to move said swinging frame into and out of operative position in timed relation to the; movements of said sleeve and spindle.

22. A gear 'finishing machine comprising' .in combination, a base, a sleeve mounted for sleeve while said spindle and sleeve are roin combination, a base, a gear sufpporting spindle mounted foroscillation on a xed axis thereon, opposed tools slidably "mountedon said base and adapted to engage a gear on said spindleduring oscillatory movements of said spindle, andmeans to slightly rotate the spindle at the opposite ends of its oscillatory motion to free the tools from contact with the gear during retrograde movement of the tool over the gear.

23. A gear finsbing machine comprisingin combination, a base, a gear supportin spindle mounted for oscillation on a fixe axis thereon, opposed tools slidably mounted on said base, means to oscillate said spindle and reciprocate said tools to engage a gear on said spindle as the spindle approaches its extreme oscillatedpositions, and means to slightly rotate said spindle in a direction tofree the gear fi'om a tool as soon as the spindle is oscillated to its extreme position.

24. A gear finishing machine comprising in combination, a base, a gear supporting,

spindle mounted for oscillation on a fixed axis thereon, opposed tools slidably. mounted on said base, means to efi'ect sliding movements of said tools in timed relation to oscillatory movements of said spindle, and means to slightly oscillate said spindle at its extreme. oscillated positions in a direction to return the spindle to its central position be fore said tools are rection. a

25. A gear finishing machine comprising in combination, a base, a gear supporting spindle mounted for oscillation on a fixed moved. in the opposite diaxis thereon,'a sleeve surrounding said spindle, means to oscillate said sleeve, opposed tools slidably mounted on said base, means to e'fiect sliding movements of said tools in timed relation to oscillatory movements of said sleeve, an index plate on said spindle adapted.

to be engaged by a locking bolt, asnpport for said lochng bolt mounted on said sleeve, and

means to slightly move said support relative to said sleeve at the opposite ends of the oscillatory movement of said spindle and sleeve 26. A. gear finishing machine comprising in combination, a base, a gear supporting spindle mounted for oscillation on a fixed axis thereon, a sleeve surrounding said spindle, means to oscillate said sleeve, opposed tools slidably mounted on said base, means to efiect sliding movements of said tools in 'timed relation to oscillatory movements of said sleeve, an index plate on said s indie adapted to be engaged by a locking olt, a

sleeve and engaging said'abutments to slightly move said. support relative to said sleeve at the opposite ends of the oscillatory movement of said spindle and sleeve.

In testimony whereof, we hereto our signatures.

HUBERT D. TANNER' RQBERT 1R. WEB,

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