US2199834A - Feed mechanism for lathes - Google Patents

Description

May 7, 1940. w. F. GROENE ET AL FEED MECHANISM FOR-LATHES Original Filed Oct. 29, 1937 3 Sheets-Sheet 1 Znmcntors. WlLLlAM EGROENE WILLARD LGROENE rmm y 1940. w. F. GROENE El AL 2,199,834

I FEED MECHANISM FOR LATHES Original Filed Oct. 29, 1937 5 Sheets-Sheet 2 3m HEJ F L 1% IE V IH i1 7 OMM/ fi Q mm I Y, 2m I m M 5m 5m m m .m \umm as am PM I mm 1/ I. I I J 0 2m I m5 vrm w mum I rm? 0 E AWN m5 7 @NM/ Po mmm rum 3nnentors. WILLIAM F. QROENE WILLARD LGRIIENE name May 7, 1940 PATENT OFFICE FEED MECHANISM roa m'rnns William F. Groenc and Willard L. Greene, Oincinnatl, Ohio, asaignors to Machine Tool Comp corporation of Delawar October 29. 1937, Serial No. and this application January 252,796

1 Claim. 1. 74-838) Original application 111,700. Divided 25, 1939, Serial N lathe feed box including a cone gear and a shiftable gear transmission. a

An object is to provide a feed box having a wide range of feed changes and which is compact in design and smooth and quiet in operation.

And a further object is to provide a combined cone gear and shiftable gear transmission having a wide range of speed changes all of which is incorporated on only two shafts in the feed box.

The above features will be described in greater detail and additional features will be pointed out in the following description:

In the drawings:

Figure I is a-front elevation partly in'section of the feed box on line 1-1 of Figure III, showing the general arrangement of the transmission and control mechanism.

Figure II is a vertical elevation of the right hand end of the feed box showing the spade handle and indexing and locating plate for positioning the tumbler pinion cylinder.

Figure 111 is a vertical elevation of the feed box as shown in Figure II but with the indexing and locating plate removed to show the interior arrangement of parts and driving .connection from the headstock interior.

Figure IV is a diagrammatic sectional view on the line -IV-IV of Figure III showing in' detail the arrangement of of the tumbler operating mechanism.

The novel feed box transmission ofour invention is completely enclosed in the feed box 8 and is flooded by' lubricant derived from the headstock interior through the opening to which matches a similar opening to of the feed box 8, Fig. IV. The feed box is mountedon the front of the headstock t, conveniently located with respect to the operator. The feed box 8 has an accurately machined locating face 2) adapted to abut against an accurately machined locating face 2H provided on the front wall of the headstock 4. Suitable bolts 2I2 are provided passing through the integral flanges 2H and 2 of the feed box 8 into appropriate tapped holes in the locating faces Ill and Ill.

Referring particularly to Figs. III and IV, the drive for the feed box is derived from a gear I29 mounted in the left hand wall 2l8 of the by the oil seal the gearing and construction face 2 of the headstock l, to thereby v securely hold the box to the headstock and provide a lubricant-tight connection between the The B. K. Le'Blond Cincinnati, Ohio, a

in the interior of the headstock 4 which drives the gear 2|! which is fixed in driving relation on the tumbler cylinder drive shaft 2l6. The

' left hand end, Fig. IV, of the shaft m is journaled in -a suitable anti-friction bearing 2| 7 feed box 8. A nut 2| 9 threaded to the shaft 2l6 securely holds the inner race of the bearing 2|! and driving gear 2 I 5 securely against the integral annular'flange 220 of the shaft 216. The bearing 2H is held in fixed axial position in the wall 2! ring 22i having the oil seal 222, by holding the outer race of the bearing 2|! against the shoulder 22 3 of the bore 224. The

' support for the drive shaft 2 l 6 to holdit in proper axial alignment.

'The feed box 8 has a very unique construction to provide ease of operation upon the part of the operator. The tumbler cylinder 22'! is journaled for axial and pivotal motions in a bore 228 provided in a transverse partition 229 formed integral with the feed box 3 and journaled in a bore 230 in the locating and indexing plate 23!, which plate is secured to the right hand end 23la of the feed box 8 by suitable screws 23lb. The tumbler pinion 226 is journaled on suitable antifriction bearings 232 and 233 in the relatively large bore 234 in the locating collar 235 fixed in the bore 234 adjacent the bearing 232 confines the bearings 232 and 233 and the tumbler pinion 226 between the inner face 23$ of the bore 23d and the face 23'! of the locating collar 235 to thereby prevent substantially all axial movement inthe bore 234 of the cylinder 22?. The tumbler gear 236 is journaled on the pin 238 fixed in the radially extending bosses 260 and 2M der 22?. The radially extending slot 282 between the bosses 24c and 2M extends into the bore 234 and provides means for axially positioning the gear 238 on the pin 239 to thereby maintain driving engagement between the tumbler pinion 226 and the tumbler gear 238 at all times. A clearance bore 243 is provided in the tumbler cylinder 221 for the extended splined end 225 of the draft shaft H6.

The cone gear shaft anti-friction bearing 2 is journaled in an movement in the shaft. The

the drive shaft 2; is protumbler cylinder 221. A

formed integral with the cylin- .the tumbler gear in far removed shaft by the lock nut 251 which binds the cone of gears 249 against the shoulder 252 of the shaft 244 adjacentthe bearing 241.

We provide a very selectively engage the various gears of the cone of gears 249. A manipulating handle 253, of a shape similar to that of a spade handle, has a cylindrical lug 254 snugly fitting in the bore 255 in the right hand end 'of the tumbler cylinder 221 and secured in place by means. of the pin 256. It can thus be seen that the manipulating handle 253 for rocking and axially moving the tumbler cylinder 221' is located substantially on the axis of the cylinder 221.

We provide a unique arrangement for promoting easy selection of tumbler gear positions of cone gear engagement and for securely holding selected position. In the manipulating handle 253 is provided a plunger 251, in a diametral bore 258, which has a tapered end 259 adapted to engage mating tapered locating and indexing holes 268 located in an arcuate projection 26| formed integral with the plate 23! and having its radius of curvature of its upper surface 26la substantially concentric with the axis of the cylinder 221. A spring 262 secured in the bore 258 by means of the threaded plug 269, yieldingly urges the plunger 251 radially outward relative to the axis of the tumbler cylinder 221 to thereby hold the tapered end 259 of the plunger 251 in secure engagement with the various tapered holes 268. A trigger 264 pivotally mounted on a pin 265 fixed in the handle 253 and having an integral arm 266 with a rounded end 261 engaging slot 268 in the plunger 251 provides means for withdrawing the plunger from the tapered holes various'gear changes.

It is to be clearly noted that with the handle 258 gripped with the hand and the plunger 251 withdrawn by pressure of the fingerson the trigger 264 the cylinder may be rotated circumferentially and moved axially to select the desired,

gear change. It is to be clearly noted that since the handle 253 is located substantially on the axis of the cylinder 221', axial movement of the cylinder by means of the handle causes no binding or cocking of the cylinder in its journals 228 and 238 as is encountered in all of the prior con-- ventional feed change Another important improvement over prior construction is the location of the point of engagement of the indexing pin 251 with the tapered holes 268 radially from the axis of the cylinder 221 while at the same time having the plunger closely coupled and located relatively near to the tumbler gear 238, not relatively far removed on the end of the manipulating handle as in prior constructions. I

In order to facilitate obtaining the proper gear selection, an inclined portion 269 of the arcuate projection 26l, facing outward and upward transverse of the lathe, has formed on its upper edge 218 a series of gear change finding notches in proper axial position on the novel and easily operated control means for causing the tumbler gear 238 to and cylinder 268 when selecting the 2" corresponding in number and relative position to the gear changes obtainable ,from the cone of gears 249. On the handle. is formed an integral lug 212 having an arcuate indicating blade 213 with a curvature concentric with the axis of the cylinder 221 and of a width to pass with ample clearance through the slots 21l when the cylinder 221 is 214 is provided in the indicating blade 213 so that when the handle 253, Fig. 11, has been rotated to its extreme clockwise position so that the end 215 of the the portion 216 of the inclined portion 269, the cut-away portion 214 will then permit the handle to be shifted axially. An index plate 211 secured to the inclined portion 269 has columns 218 coinciding with the various notches 21! which show the various threads and feeds obtainable in each of the notches selected.

The operation of shifting the cylinder is relatively simple. The operator grips the handle 253 and depresses the trigger 264 thereby releasing the plunger 251 from tapered hole 268. The operator then rotates the handle clockwise, Fig. II,'until the end 215 of the handle 253 engages the surface 216 of the inclined portion 269 and at the same time removing the indicating blade 213 from an indicating slot 21l. Under these conditions the cylinder 221 is free axially in either direction its maximum travel. The desired thread index plate and the handle 253 is moved axially until the blade 213 is positioned over the slot 21! coinciding with the column of the index plate in which the desired thread or feed is found. The operator then merely rotates the cylinder counterclockwise which automatically causes the plunger 251 to engage in the proper tapered hole 268 to properly mesh the tumbler gear 238 with the cone of gears 249. The main advantage of the indicating notches 21! and indicating blade rotated. A cut-away portion handle 25: is in contact with I to be moved is to enable the operator to quickly and easily determine the proper setting of the tumbler cylinder relative to the index plate, a feature distinctly lacking in all prior constructions; This arrangement also prevents improper meshing of the tumbler gear 248 with the cone of gears 249 and also avoids the necessity of jiggling the cylinder 221 in order to find the proper tapered hole 268 for the locating plunger 251.

In order .to provide a wide range of threads and feeds beyond the scope obtainable by means of the cone of gears 249 we provide a series of coarse speed changes in the feed box 8 in addition to the gear changes just described. On the cone gear shaft 244 and integral therewith between the bearings 245 and 241, and adjacent the latter, is formed a twelve-tooth pinion 219. Adjacent the pinion 219 is secured to the shaft 244 a compound gear 288 comprising "the small twentytooth gear 28! and the larger thirty-tooth gear 282, the compound gear 288 being fixed in driving relation onthe shaft 244 by means of the key 283. Between the compound gear 288 and the bearing 245 is journaled the compound gear 284,

comprising the large forty -five-tooth gear 285- and the small fifteen-tooth gear 286, having a bushing 281 fixed in its bore and adapted to rotate freely upon the bearing portion 288 of the shaft 2.

Closely associated and parallel with the shaft 244 is provided the output drive shaft 289 of the 8 the clutch gear adiacent'the pinion 294 fully to the left, as shown partition 229. The bearing retainer 292 having the lubricant seal 298 serves to properly adjust the bearings 290- and 29l to eliminate substanttally all axial movement in shaft 289. Formed integral with the shaft 289 adjacent the bearing 290 and between this bearing and the bearing 29! is a fifteen-tooth pinion .284. Adjacent the pinion 294 is rotatively mounted a pinion sleeve 288 having a bearing bushing 298 fixed in its bore 281 adapted to revolve on the bearing portion 298 of the shaft 289. Between the pinion sleeve 295 and the bearing 28! is rotatively mounted 299 having a bearing bushing 888 fixed in its bore 80| adapted to revolve on the bearing portion 3020f the shaft 289. The

clutch gear- 299 comprises a forty-eight-tooth gear 299a adapted to constant engagement with the twelve-tooth pinion 219 of the shaft 244. Mounted for axial movement on the pinion sleeve 298 is a compound gear 308 adapted to drive the sleeve 295 by means of a key 804 fixed in the sleeve and having sliding engagement in a suitable keyway in the compound gear 303. The compound gear 308 comprises a small thirtytooth gear 305, a large forty-tooth gear 808, and clutch teeth 801 on the face of the gear 808. When the compound gear 303 is shifted axially to its extreme left position, Fig. IV, the gears 805 and 282 will be brought in driving engagement, when shifted to its intermediate position, as shown in Fig. IV, the gears 808 and 28| will be in driving relation, and when the compound gear 808 is shifted to its extreme right position the clutch teeth 301 will engage mating clutch teeth 808 on the face of the gear 299a, only one of the above combinations being engageable'at a time.

Formed integral with the pinion sleeve 295 and is a fifteen-tooth pinion 809 of the same dimensions as the pinion 284 ofthe shaft 289, a portion of the pinion 809 removed from the pinion 294 constant driving engagement On the pinion 294 is mounted a forty-tooth gear 8| 0 having a bore 8 which is an internal gear snugly fitting about the teeth of the pinion 294 but permitting the gear 8! to be shifted axially of, the shaft 289. When the gear 8l0 is shifted in Fig. IV, it will be supported only. on the pinion 294 and will then be in driving engagement with the gear 286. When shifted fully to the right, the gear 8l0 will be disengaged from the gear 288, the internal gear bore 8 of the gear 8l0 will then engage over the portion of the pinion 309 adjacent the pinion 294 so as to provide a positive driving connection between the shaft 289 and pinion sleeve 295.

In noting the specific example of gear ratios here illustrated we wish to point out the very wide range of speeds obtainable from this arrangement. A series of speed changes, between the cone shaft 244 and feed output shaft 289, from one to thirty-two-to-one lows: With the gears 8i2 shifted to the right so that the sleeve 295 is connected in direct driving relation to the output shaft 289, engagement of gears 282 and 305 provides a 1-to-1 ratio; engagement of gears 28l and 808 provides a 2-to-1 ratio; and engagement of the clutches 801 and 808 provides a 4-to-1 ratio. With the gear 3l0 shifted to the left engaging the gear 888 an 8-to-l ratio is provided from the sleeve 295 and the output shaft 289 through the gear 809 driving gear 285 and gear 288 driving gear 294;

with the gear 285.

' adapted to contact the being adapted to shifted positions are selected.

are obtained as fol-.

' this illustration to more clearlygive some idea of the wide range of feeds and threads obtainable from this novel, compact feed box transmission. it is to be clearly understood that we are in no way limited in the scope of our invention to the specific example herein disclosed. The means for selecting the six major speed changes of the feed box transmission noted abovecomprises a control handle 8l2, Figs. I, II, III, V and VI, fixed to the transversely located rock shaft 8 journaled in the front wall 3 and rear wall 8l5of the feed box 8. On the shaft 818 is fixed a gear 3I8 between the wall 8I5 and 8H and adjacent the latter wall 3 which is adapted to engage a rack 3!! formed on the top of the longitudinally located shifter rod 8| 8, the rod 3I8 being mounted and axially slidable in the wall 218, in the partition'229, and in a base 8l9 formed integral with the wall 28la of the feed box. Fixed to the rod 8| 8 intermediate the wall 2l8 and partition-229 is a shifter yoke 820 compound gear 808 in the annular slot 3l2. Thus, by moving the handle M2 to the right or left the rod 8| 8 through the rack M1 and gear 8l6 will be moved axially and by means of the shifter yoke 320 the compound ear 803 can be easily shifted to the respective positions already discussed. Indicating letters A,-

B, and C, shown in Fig. VI, are provided to show the position selected relative to the feeds and threads obtained as shown on the index plate 211. These positions are shown in column 82l of the index plate 211. A detent arrangement comprising the plunger 822 urged against the rod 8|8 by a spring 828 in a suitable bore 824 in the boss 3l9 engages in the notches 825 when proper shifted positions are selected- In a like manner the gear 8l0 is shifted by means of the handle 826, located directly under the handle 8l2, through the transverse rod 821, the gear 828, the rack 829 on the rod 880, and the shifter yoke 88] fixed to the shaft and engaging around the gear 810. A detent means comprising the plunger 882 urged against the rod 880 by a spring 888 in a suitable bore 884 in the boss 8! 9 engages in the notches 885 when proper Indicating letters, D, and E, shown in Figure VI, are provided to show the position selected relative to the feeds and threads obtained as shown on the index plate 211. These positions are shown in column 386 of the index plate 211.

It can thus be seen from the above description that we have herein provided a feed box transmission of compact design and having a very wide range of feeds and threads which has a system of control levers simple and easy to operate and which are conveniently located for-the opera r in close association with the control means for the headstock. It is unnecessary for the operator to bend over in order to read the index plate or make the necessary manipulations of the control levers of the feed box as is an inherent defect in all prior constructions.

The driving power from the feed box 8 to the carriage control box 9 is transmitted through a series of conveniently located change gears at the left hand endof the lathe. This drive comthequadrant 362, the idler gear in turn driving a gear of the same the gear 331 and size and number of teeth as drive shaft 344 by means of the nut 3% in the same manner provided for mounting the gear 831. The quadrant is supported and clamped by suitable bolts 8% passing through elongated holes 3&1 in flanged portions 368 of the control box 9 so'that various sized change gears can be applied to the feed box output shaft 289, the control box drive shaft 3, and the quadrant stud 341. standard arrangement utilized in operating the lathe in low back gear, high back gear, and high spindle speeds when it is desired to obtain the standard ranges of feeds and threads for use with these spindle speeds. When it is desired to obtain metric threads and feeds the usual metric transposing geartransmission may be substituted for the gearing described, the gears being made quadrant stud 35 i r said shafts comprisinga removably mounted on the The gearing just described is the with helical teeth and of relatively wide face to insure quiet running and long life. i The wide faces also permit applying compound gears of normal width of face to the desired odd feed and lead of 'thread'may be obtained with this lathe bymerely applying the proper of these gears; v

Having fully set forth and described our invention what we claim is: l

In a change speed transmission, an input shaft, an output shaft, change speed gearing between pinion formed on said input shaft, a small gear fixed on said input shaft, and a large gear fixed on said shaft, a

gearing in place compound gear rotatably journaled on said input 15 shaft, '9. gear rotatably journaled on said output shaft arranged to be in constant engagement with said pinion of the input shaft, a. sleeve gear rotatably journaled on said output shaft and arranged'in constant mesh with compound gear journaled on said input shaft, a compoundg'ear slidably mounted on said, sleeve gear having its gears. arranged to engage the small and largegears fixed and having clutching means for engaging the gear rotatably mounted on said output shaft, and

a gear slidably mounted in driving relationship on the output shaft arranged to alternately engage a gear of said compound gear j ournaled on said input shaft and the sleeve gear journaled on said output shaft. i

F. GROENE. WILLARD L. GROENE.

a gear of said 2 on said input shaft

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