US880916A

US880916A - Carriage-feeding mechanism for lathes, &c.

Info

Publication number: US880916A
Application number: US34375106A
Authority: US
Inventors: James C Potter
Original assignee: Potter & Johnston Machine Co
Current assignee: Potter & Johnston Machine Co
Priority date: 1906-11-16
Filing date: 1906-11-16
Publication date: 1908-03-03
Anticipated expiration: 1925-03-03

Description

No. 880,916. PATENTED MAR. 3,,1908. J. G. POTTER.

CARRIAGE FEEDING MECHANISM FOR LATHBS, 62o.

APPLICATION FI'LBD NOV. 16. 1906.

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M W MW W w No. 880,916. PATBNTED MAR. 8

J. O. POTTER.

CARRIAGE FEEDING MEGHANISM FOR LATHES, 8w.

PPLIOATION FILED 0V.1 6. A N 6 190 5 SHEETS-SHEET 2.

M 3H vow-fox 6Qmm elite pump.

No. 880,916. PATENTED MAR. 3, 1908. J. G. POTTER.

CARRIAGE FEEDING MEGHANISM'POR LATHES, &0.

APPLICATION FILED NOV. 16. 1906.

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, x I v l/mtm 81409141506 PATENTED MAR 00 0 9 1 0% R E m T 0 P 0 h 6 1L 0 8 00 m N CARRIAGE FEEDING MECHANISM FOR LATHES, &0.

APPLIUATION FILED NOV. 16. 1906.

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mvam/foz yam PATENTED MAR. 3, 1908.

. J. G. POTTER.

CARRIAGE FEEDING MECHANISM FOR LATHES, &0. APPLICATION FILED NOV.16. 190a.

l/9i bmaoow nnrrsn srnrs rnrnn'r Fries,

JAMES "G. POTTER, OF PAWTUOKET, RHODE ISLAND, ASSIGNOR TO POTTER dz JOHNSTON MA- CHINE COL, OF PAWTUOKET, RHODE ISLAND, LA. CORPORATION OF RHODE ISLAND.

OAKRRIAGE-FEEDING MECHANISM FOR terms, as.

Specification or'Letters Patent.

Patented March 3, 1908.

Application filed November 16, 1906. Serial No. 343,751.

T 0 all whom-it may concern:

Be it known that I, JAMEs O. Porr'nn, of Pawtucket, in the county of Providence and in the State of Rhode Island, have invented a certain new and useful Improvement in Carriage-Feeding Mechanism for Lathes, &c., and do hereby declare that the following is a full, clear, and exact description thereohreierence being had to the accompanying drawings, in which y r 4 Figure l is a top plan view of a turret lathe in which my invention is embodied for reciprocating the turret slide; Fig. 2 a side e'leva tion, partly in section; Fig. 3 a cross-section on line 3-3, Fig. 2; l ig. i a detail view, partly in plan and partly in section, showing the slide-reciprocating bar, with the parts in the position they occupy atthe beginning of the forward movement of the slide; and, Fig. 5 a similar view showing the parts in the position they occupy on the return moveinent of the slide, at the time the change of slide moving mechanism is about to occur.

My invention relates to feed mechanisms for lathes, and its object is to overcome the limitations as to range or" travel which inhere in or characterize said mechanisms, as heretoiore constructed, and give any desired range of travel thereto, and to this end, my invention consists in the feed mechani is. constructed substantially as hereinafter spec. iied and claimed.

The type of lathe in which have en bodied my invention, and which .l show in t e drawings as illustrativeof one ercbhdirnent of my invention, is the familiar turret lathe which a earn drum is employed to recipro cate the turret slide, such, for example, as shown in United States patent to Potter and Johnston Machine Co, June 7, 1904, No. 761,905. The employmentoi earns for reciprocating the turret slide is very desirable because cams are admirably suited for giving the varying speed of feed essential for the different turret tools, but they are seriously objectionable becauseot their limitations in re spect of the range or extent of travel that be imparted by them to the slide. increi of travel of the slide necessitates increase size of the cam-carrying drum, both as width and diameter, and increase ofdiarneter is objectionable because crease in the height of the yet a long'travel of the slide is v both because the quality r character the Work desired and in manipulating or handling the machine. Thus, for example, in the use of a boring bar, it is important to sup port the forward end of the bar, as by entering it in the head stock s indle, but because of the length ofthe wor or for other reasons, the extent of travel of the slide produced by the cam will not admit of this. Again, the length ofthe turret tool may be such that considerable travel of the slide from the work may be required to enable the tool to clear the Work when the turret is revolved. From what has been said, it therefore will be apparent that an increase of the travel of the slide to any extent desired, without enlarging the size of the drum, and consequent increase of the height of the machine, is a matter of great importance, and this I have accomplished by my invention.

Referring now to the drawings, A desig- 7 natesthe frame of a turret lathe; it the head stock, in which is jonrnaled the spindle C, carrying the chuck c; If) the slide on which is mounted the tool turret E; and the carncarrying drum, all which parts are, or may be an of usuai construction and therefore need no particular description.

Attached to the bottom of the slide ing means consisting bolts T-siot 35 so that 1611 desired, the slide may be shifted its position. oi bar G on the bottom there s c earn engaging projection in the form an antiiriction roller g; which the action of the cams f on the drum h moves the turr t towards and from the head stock in the usual manner. As have already explained, the extent of travel of the turret slide by the 95, earns is a limited one and any increase its travel 1 y the use the cams is objectionable because of its compelling increase of the machine, and ye" l he work on these raa 190 Licreasc the travel solved this problem by the cf slide-reciprocating olernentary to the c s, and

oi my invention shown 1c: oanying drawings, a teeth on one side in mesh therewith,

end. of a short ver c ear L the lower end of said sides thereo shaft K, two bevel pinioris' M meshing with the bevel gear on diametrically opposite and loosely mounted on ashort horizontal shaft M, with which they are situated in a cam actuating bar G, said slot or cam hem com-- adapted .to be alternately clutched so that the pinion I may be'revolved in either direction, and a gear wheel 0 on the shaft N, whichvby ears 0 and 0 receives'motion from a shaft P extending longitudinallypt the rear of the machine, and which, by a.

train of gears Q, is revolved from a pulleydriven shaft R 'ournaled in bearings on the rear side of the bad stock.

Each of the bevel pinions M has a clutch posed of a centrally disposed longitu inally extending straight path W, and two longitudinally extending straightpaths W and -W arrangedon either side of the transverse center of the bar, and connected withsaid centrally disposed path W by paths that diverge therefrom, and in one of said paths,

as is common with this type'of cam, there isa switch latchor gate w which permits the arm roller v to pass from the centrally disposed path W into only one (the path W) of the other straight paths. Said other, ar-

- when t moved to the other allel, straight paths are connected at t eir ends 0 posite the single, central path, and

he roller has traversed the path W it is ath JV (and the clutch collar S thereby shi ted) by means of a coil spring X. mounted in an extension of the roller-carrying arm V with one end bearing thereagainst and the .other end, through the medium of a closedended tube or casing a: bearing against a surface on the machine frame A. Nhenthe arm roller 22 is in the centrally disposed path W, the clutch collar Sis held inmid position so that neither bevel pinion M is in mesh with the bevel gear L, and thus no motior'i-be transmitted to the bar G thereby.

It will be seen that by the reciprocation of the bar 'Gfwith its cam paths, the clutch collar S, so long as the armroller o is in'the centrallydisposed path W, Will be maintained in mid-position, and no movement he imparted to the turret slide by the pinion and rack, or said collar will-be shifted to clutchone of the other of the bevel pinions M to their shaft, so as to revolve the rackengaging'pinion I and move the turret slide towards or from the work, according to 1 which of the bevel pinions M is clutched to its shaft, such rotation of the bevel pinion,

and consequent travel of the turret slide, continuing so long'as' the armroller v is in the respective cam path W orW i During the timethe arm roller '0 is in thecentrally dis-- ,posed path W and of the conse uent inactionof the rack-engaging pinion the turret slide is moved by the action of a cam f on the periphery of the cam drum F, and the movement of the turietslide at this time, in one wholly by the rotation of the pinion I, and

the extent of the travel of such slide is, of course, entirely dependent upon the length of the rack and of the straight paths W or W which length may be any that is desired. The movement of the bar Gand the turret slide, during the time the clutch collar S is being shifted from one of its positions to another by the passage of the arm roller o fromthe straight path W to the straight ath W andfrorn the straight path W -bac to the straight path W, is effected by the cam plates f on the drum F.

The positions of the straight paths W, W and W with reference to the ,direction of travel of the turret slide are such, that, when the turret is at the extreme point of its travel awayv from the work, the arm roller '0 will lie the work, and that bevel pinion Mfwhich rotates the pinion l in the direction to move the turret slide towards the work, will be in the end ofthe straight path W nearest 7 clutched to its shaft, and will remainso' clutched until the arm roller '12 has traversed the length of the. path Wtand reaches the switch latch or gate, at which time one of the feed cams f on the drum F will engage the projection or roller g on the bar G, so that further forward. movement of-the bar G and the turret slide, and the shiftin of the cultch collar F to mid-position by t e passage of the arm '0 to the inner end of the straight path W, will be effected by the action of said cam Thisforward travel 'of the turret slide while the arm roller '0 is in the striaght path W is utilized to bring the turret tool which is to be used into posltion to begin its work, and if, for example, such tool is a boring bar Y, it enables the portion of the latter in advance of the cutters to pass through the work supported by the chuck and enter a pilot bushin in the end of the spindle, so that, so to spe r, the turret-and spindle will be tied together and the boring. bar rigidly supported at both ends while the cutting or boring is being done. It will, therefore, be evident that if the subject of "work'is along piece, Whether the amount of work to be done is long or short, I am enabled to rigidly suport the tool-carrying bar at hot endsf l ave referred to the use of a boring bar ,merely as an illustration, for, as will/be seen frofn the illustration in-Fig. 2 of the drawings, a tool Z for doing outside work may be used, such tool Z being mounted upon a bar that at one end is secured to the turret. During the travel of the turret slide when the arm roller 0 is in the straight path W the turret slide is moved to withdrawv the boring or tool-supporting bar from the spindle or work t'o'an extent, of course, corresponding with its movement when the arm roller 12 is in the straight path VV by the action of the rack and pinion, the extreme portion of the rearward travel of the turret slide being ef fected by one of the return cams f on the cam drum F. The speed at which the turret slide is moved by the gearing that is independent of or in addition to, the cam drum F, is a constant one, the shaft P that receives its motion from the shaft R and from which power is taken to revolve the pinion I,

which meshes with the rack on the bar G, rotating at a constant speed, which speed is one selected as best suited to effect the automatic revolution of the turret, the means for doing it, however, as the same forms no part of the present invention, need not be described. p

It will be evident that by my invention thesize of the cam drum F may be as'small as is consistent with the extentof feed movement of the turret slide necessary to begiven it while the turret tools are actually at work, inasmuch as such travel of the tur ret slide as is necessary or desirable for'advancing or moving the tools into position for work, is produced or obtained by mechanisni which has no such limitations or restrictions as to the extent of movement of the slide to be imparted thereby, as inheres in the cams f of the cam drum, and that such movement of the turret slide, independently of the cam drum, may be to any extent which the exigencies or needs of a particular machine may require. Besides the very important advantage of sup orting the tool-carrying bar at the spind e end, which flows from my invlention, there is also the advantage that, when the turret is to be revolved, it may be done,even though it have tools of unusual length, because ample space may be provided to avoid contact of t 1e tools with the work when the turret is revolved; I

The cam-engaging projection or roller 9 of the bar G is always in proper time relation for engagement by the cams f, and this is true although the turret slide is shiftable,

as is necessary to suit the work to be done, because of the connection between the tool slide and the bar G which permits the movement of the turret slide independently of the bar G.

To enable the turret slide to be actuated only by means of the cam drum F, which at times may be desirable, I provide means for disengaging or unclutching the bevel gear L from its shaft K which means-consists of an ordinary clutch collar 10 s lined to the shaft K and movable out o and into engagement with the clutch collar or hub on said bevel'gear, by means of an arm 11 slidably mounted, for convenience, upon the lever shaft U and which is connected by a linkor bar 12 to an eccentric 13 on a shaft 14 journaled in bearings on the frame A and projecting at the front thereof, where it is' provided with an operating handle 14.

It is thought that the operation andadvantages of my invention are made sufficiently clear from the foregoing description, so that no further setting forth thereof is necessary.

It is to illustrated and described in detail the construction of a certain machine in which I have embodied my invention, the scope of so i my invention is not limited or restricted to such or any particular construction of, machine.

Having thus described my invention, what I claim is 1. In a feed mechanism for feeding a tool, the combination of a traversable tool holder, a drum having cams arranged to act in succession to move the tool holder during one part of its traverse for the performance of work by the tool, and separate means arranged to be effective upon said tool holder to move it durin another part of its traverse.

2. n a feed mechanism forfeeding a tool, the combination of a traversable tool holder,

means arranged to be efiective upon said holder to move it back and forth during one part of its traverse, and separate means arranged to be effective upon said tool holder to move it back and forth during another part of its traverse.

. 3. In'a' feed mechanism for feedin a tool relative to its Work, the combination 0 a traversable tool holder, a series of separate and op ositely acting cams to move said tool holfler during that part of its traverse back and forth over the work, and. se aratetool holder moving means arranged to e effective durin another part of its traverse,

4. n a feed mechanism for feeding a tool relative to its work, the combination of a traversable tool holder,"a cam drum for moving the same durin that part of its traverse to and fro over t e work, and separate tool holder moving means arranged to be effective during another part of its traverse.

5. In a feed mechanism, the combination of a traversable carriage, means for moving the same during one part of its, traverse,

comprising a series of successively acting cams, a shaft geared to the carriage, gearing connecting the shaft to a source of power, a clutch for controlling the connection of said shaft with its source of power, and a weeter.

6. In a feedmechanism, the combination of a-traversable carriage, means for moving the same during-one. part of its traverse,

comprising a serles of. successively acting of a traversable carnage, means arran e to cams, separate. means arranged to be effective to move said carriage during. another part of its tra verse',- a clutch for controlling the. operation of said separate means, and a connection between. said series of cams, and

the'clutch to operate the latter.

In a feed mechanism, the combination of a traversable carriage, a. series of succes-' sively acting. cams for moving the carriage.

durin one part of, its traverse, a. shaft geare to the carriage for moving it during another part of its traverse, a reversing gear for driving. the. shaft, and a clutch for controlling. the connection of said shaft with the reversing gear.

8. In a feedmechanisin for feeding a tool relative to its work, the combination of a traversable slide, means for moving the same during a part of its traverse, separate means forrnoving it during another part of its traverse, and means controlled by said slide for starting, maintaining and stopping the operation t said separate means. i

9. In a feed mechanism, the combination Off a slide, a, reciprocating bar, connections movethe slide beyond the limit to which the cam device moves it, cam paths in said bar, a clutch for-said mechanism controlled by said cam paths and a. connection between the cam paths and the clutch for controlling the latter.

; In a feed; mechanism, the combina ion be effective. to move said carriage bac andforth. during a part of its traverse, separatemeans arranged to. be efiective upon said: carriage to. move it back and forthduring an- 11 In a feed mechanism, the combination of a traversable carriage, means arran ed to be effective to move said-carriage. b ac andforth during a art of its traverse, separate means arrange to be effective upon said car- "riage to move it back and forth during another portion of the traverse, starting, stopping and reversing mechanism for said separate means, and a connection between SfiJd mechanism and said first-mentioned carriage moving means.

In testimony that I claim the foregoing I Witnesses:

MITCHELL ADAMS, CHAS. H. W. RoBERTs.