US2352548A - Cross-slide mechanism - Google Patents

Description

June: Ax, Hi: JOB ERI' GEMS-SLIDE MEGHEN ISMI Filled Nov. 263,, L940 4 Sheds-Sheet 1 INVENTORS llll 4277/02 H. JOBERT JEfOME J. TARA VE'LLA ATTORNEYS June 27, 1944. A; H. J'QBERT AL, CROSS-SLIDE; MEcHANisM Filed Now 26, 194% 4 sheafis sheet 2 INVENTORS ARTHUR H. JOBEET JEI$OME J. 7464 VELLA ATTO R N EYS June 1944. A; JOBERT ETAL 2,352,548

CROSS SLIDE MECHANISM Filed Nov. 26) 1940 4 SheerLs-Sheet a lllw 5% ATTO R N EYS dmous J. 73424 VE'LL A June 27, A JOBERT ETAL cRoss-sLIbE MEcHA NIsM Filed Nov. 26; 1940 4 Sheets-Sheet 4 INVENTORS AETHUR H. JOBE'ET a e/-45 J. EPA I/ELLA ATTORNEYS plitude of reciprocation. ,7

Patented June 27, 1944 UNITED STATES 2,352,548 we I CROSS-SLIDE MECHANISM Arthur H. Jobert and Jerome,

its-

Britain, Conn, assignors to The-New Britain Machine Company, New Britain, Conn., 'ac0r-' poration of Connecticut ApplicationNovember 26, 1940, Serial No. 367,168 l 10 Claims.

Our invention relates to improvements in slide mechanisms, and particularly to cross-slide mechanisms for machines, such as lathes, multiple-spindle screw machines, and the like.

It is customary in machines of the character indicated to employ camming means ,for moving the. forming and other tools operated from cross slides. Hitherto, the flexibility or adaptability of suchmachines to producing various sizes of work has either been limited to work which may be turned out with one, set of cross-slide cams, or it has been necessary to have a multiplicity of inter-v changeable cams to adapt the machine to the type of work being produced. Not only is it uneconomicalto have to carry a large stock of such cams on hand, buta large amount of labor is .involved in the replacementof these parts according to the variety of work to be produced.

we propose a relatively simple device which will eliminate the necessity ofqchanging cross! slide'cams and which will adapt the machine to a.

wide variety of operations and uses. 7

It is an object of the invention to provide improved cross-slide feeding means in machines of the character indicated.

Another object is the provision in such machines of improved means for jump-feeding tools up to the work prior to a relatively slow working feed. i

It is another object of the invention to provide means for deriving a yariety of reciprocal strokes within a constantor substantially constant am- ,Aifurther object is theprovision of means for variously relating the jump to the feed stroke in a machine of .the character, indicated without changing the total period for beth jump and feed motions l. Itis also an object of this invention to' provide meansfor obtaining various lengths of jump and feed, strokes without altering the total of both the jumpand the feed stroke. r v

Still another object resides in provision of improved ,means for producing a plurality of toolfeeding motions, without disturbing theca'm or other meansfrom whichthe tool-feeding motion isderived.-.. Other objects and various features of the in vention will become apparent to those skilled in theart from a reading of the following specification in conjunction with. the drawings included herewith, which show, for illustrative purposes only, a preferred embodiment of the invention, andinwhich-., 7 Fig.1 is an end elevation, partly broken away,

20 work;

showinga I conventional v multi-s pindle ,rnachine having cross-slides, operated through the medium of a device illustrativeof this invention;

Fig. 2 is a-detailedview,partly-llorokenaway,

and illustrating features .of the invention, ,the mechanism beingshown in position correspond-v ing to a fully retracted position ofthe cross-slide tools; 1 u I t v .1

Fig. 3 is a partlybroken-away, sectional. plan of parts shown in Fig. 2, and as viewed substani Fig- 4 and takenin generally vertical, central plane s.

' Fig. 6 is a detailed elevation similar toFig. '2,

but illustrating the relation of 'p'artS after the jump and jut prior toa gradual feed into the "Fig.- '7 is another detailed elevationfsimilanto' Figs. 2 and 6, but illustrating the relation of parts at the end of the working stroke; 7

Fig. 8 is an enlarged isometric view of a detail;

At the outset let it be understood that the terms,

slide and (cross-slide, ashereinafter useddu this'speeification,' of cours e 'refer not only to the slidesof the' 'general nature shown in the draw ings, but also include'alltool-advancing means,

such as tool carriers which maydepnd upon 'rotation to feed a toolje'nd-working tool slides, and thelike.

Our invention in theform illustrated includes an" adjustable means disposed in the customary linkage for "operating cross slides'froni a'maiii cam shaft.- By means ofadjust'men'ts which 'mayeasily be made, it is possible to provide" for an adjustablejum'por relatively fast feed up toth work, followedby' an'adjusta'ble 'relatively'slow 40 cutting 'feed in the wo'rkall with one "standard driving cam or other 'drive meansff For illustrative purposes, and byway of "example only, we have shown'our invention in.

Fig; 1 in conjunction with an automatically in; dexing eight-spindle m'achinei Four cross-slides holding forming or cutting-(iii tools, as" is customary, are positioned for working in the four spindle positions shown in this elevation. 'In the form shown all cross-slideunits are'mounted on the frame 5 of the'machin'eI Sli'desli and 1, for

spindles 2 "and l3, respectively, are" likewise mounted as a'unit; but,=in the' 'forni shownfthey' purpose.

operate together and with the same feeding motion.

Motion for jump-feeding and work-feeding the cross-slides is derived from any desired feeding means, and in the form shown, cams, carried by cam disks I4 and I5, are provided for this However, we propose to provide additional means between the cam and cross-slide. This additional means, which forms part of the subject of the present invention, is illustrated more clearly in the enlarged detail views of Figs. 2, 3, 4, and 5.

In the form shown mechanism according to our invention forms a connection between the cam-follower arm I5 and a crank I'Lwhich in turn acts directly on the tool-slide to propel or retract the same. This link or mechanism is preferably a plate I8, which is slidable in a generally longitudinal direction, as determined by the ways or'tracks I9 and 20, respectively. The guideways I9 and are shown as formed on the block or base 21. Retaining guide- plate members 22 and 23, extending out and over the cut"- out portions defining tracks I9 and 20, respectively, are held securely in place by bolts 24,

which bolts further serve to seat the base 21 rigidly on the frame 5 of the machine; The plate I8 is provided with opposed parallel edges 25 and 26, so as to fit slidably within the corresponding tracks I9 and All. The cam-follower I6 andthe plate I8 are pivotally connected as by meansof the pin 21., The lever "is actuated by the plate I8. through means, such as an ad-' justable connecting pin-roller 29. Algenerally vertically extending dovetail slot 28 is preferably provided on the plate I9 in order to a'ccom modate a dovetail on thepin-roller 29 which maythus. beadjustably. secured to plate I8, as

by a clamping bolt 3f, in a definite position for.

control purposes which will later become apparent.

It will be seen how longitudinal reciprocal greater accuracy in setting up, as will be clear;

Inorde'r'to provide for two different speeds'of the cross-slide from one given stroke of the camfollower arm I6, we make possible an additional motion of the plate I8. We terminate the longitudinal guided motion, which has been described above, by running a pin 33, fixed to the plate, against a'stop; and thereafter cam-follower-arm motion may be translated into a rotary motion of'plate I8 about pin 33. as will be clear. After pin 33 abuts the end' of a slot 3'4 in base plate 2l'to forma point about which rotation may take place, an arcuate edge 35 of plate I8, arcuate about the pin 33, has reached the end of the strai ht tracki l (see Fig. 4) and is positioned to slide within thecorrespondingly recessed arcuate track portion 35. of the base plate-2L A portion of the upper edge of the plate I8 is cut off so that rotary.motion thereof is permitted without fouling the straight track I9, as will also be clear.

It will be noted that, depending upon the location of the pin-roller 29 in the dovetail slot 28, the crank I? may be given any movement, ranging from zero to a maximum, during the period of rotary motion of plate I8. Zero movement will be obtained when pin-roller 29 is positioned directly above, and concentric with, the stopping pin 33; and a maximum movement will result from securing the pin 29 at the bottom of slot 28.

It will be understood that the type of motion obtained with our wobble-plate device is a relativelyfastfeed or transposition of crank II throughout the first part of the cam-followerarm stroke, that is while the plate I8 slides on the guides I9, 23; and a, variable, relatively slow feed throughout the remainder of the same stroke, that is while the plate I8 rocks about the pivot 33., In the machine shown, use may be made of the first fast feed to obtain a jump feed or relatively rapid advance of a tool up to the Work, and of the variable gradual motion for feeding the tool. Upon retraction, or rather, on the return half of the cycle through which the cam-followerarm travels, plate I8 will go through the same series. of motionsand, of course, in reverse order to that followed for feed; that is, there will be a slow retraction of the tool in the immediate vicinity of the work, followed by a fast or. jump retraction, rapidly to'clear the tool from the work to permit free indexing. Jamming the wobble plate I8 within therotary track, as the jump retraction, begins, is avoided by provision of a guiding stop 31, positioned to abut the generally arcuate upper left edge 38 of. late I8 at all'times exceptwhenv plate IB is in alignment with the straight ways I9 and 29 to slide back freely along the same. Atthis instant the guide stop 31 will be opposite a corresponding slot 39 in plate I8, and free guided sliding is permitted down the substantially straight ways I9 and 20.

The cycle of operations and successive positions of the wobble plate I8 will be clear from an examination of Figs. 2,, 6, and 7, in that order. The roller-pin 29 has been fixed in an intermediate position along the dovetail slot 28 for a relatively small feed, as will be understood. Fig. 2

'- shows the relationship of the driving members just prior to jump-feeding the tool up to the work, that is, the cam-.follower-roll 40 on camfollower-arm I6 is about to engage the jumpfeeding surface 4| of cam I4. With thefast jump-feeding motion derived therefrom, the parcomplished, the guide stop 31 has-left engage ment with the guide slide 39, pivot pin 33 has abutted the end of slot 34, and the curved surface 35 of plate I8 is in position to slide within the arcuate grooved track 36. As the cam-follower-arm I 6 is slowly urged further by the working-feed surface 42 of cam I4 throughout that portion of the stroke (from the position shown in Fig. 6 to that in Fig. 7), the wobble plate is forced to rotate, and thus to carry pin-roller 29 through an are (which in the case shown is relatively small) and at the same time to impart a reduced feeding motion to the cross-slide by means of the sector gear 43, on crank I'I engaging a rack on the cross-slide. p

After the end of the cam-feed surface .42 has been reached, the cam-follower-roll 49 is immediately engaged by the draw-back surface 440i cam l4 in order quickly to clear all tools from the work so that no work or tools will be fouled upon indexing, which in the form shown is permitted to take place within almost a half-revolution of cam l4 by the long dwell which may be observed on the cam-surface 44.

Several forms of cross-slide to which the wobble plate adjustable link may be adapted are shown in Fig.. 1 in connection 'with 'an eightspindle machine. It will be clear thatthe form which has been described'in detail has referred to mechanism for operating cross-slides l and II at spindle stations I2 and I3, respectively. In the form shown,.slides l0 and] l are unitarily mounted and are guided and supported in their sliding motion by means of the sleeve 45, which fits slidably around a guidingstub-shaft 46. A

rack 41, aflixed'to the cross-slide unit [0+H,

engages the sector gear 43 of arm I! to pick up the feed motions which have already been described in detail. Thus, the single cam l4, operating through the ,wobble plate I8 and the rack and sector gears, may operate two forming tools with feed which may be controlled by adjusting the pin-roller 28, made readily accessible by means, such as a sliding door panel 48.

Fig. 1 further shows how the two additional slides 6 and I may be controlled to have motions independent of each other, although they are driven from the same cam shaft (which in the form shown is geared to rotate in 1:1 ratiowith the shaft ofcam I4). Considering operation of slide 1, the linkages concerned are essentially thesame as those for slides It! and l l. The cam follower-arm 49 reciprocates in a generally vertical direction to actuate the wobble plate unit 50 and thus adjustably to rock the slide-control double-arm or bell-crank 5| for jump and work feeding, as will be clear from an appreciation of the pivotal connection of bell-crank 5| toslide I at, say, the point 52. In a similar manner, motion for slide 6 may be picked up by cam-follower arm 53 from the same cam surface on cam l5 as was used for cam-follower arm 49. This motion is again communicated to wobble-plate link 54 and then transmitted by double-arm-crank means 55 to slide 6 at the pivotal connection 56 between the latter two members.

It will be clear that by making the setting of the pin-roller on wobble-pla 54 different from that on plate 50, two independent and distinctly diiferent feeds will be offered slides 6 and 1, although they may both be controlled and operated by identical or similar cams on disk l5.

It will be observed; from a viewing of Figs. 2, 6, and '7, that, no matter what the vertical disposition of the pin-roller 29, the total of the jump and the feed stroke may be maintained constant by employing a cam l4 of suitable throw for the particular location of crank 11. At the start of the jump stroke (Fig, 2) it will be noted that the pin-roller slot 30 on crank l'l overstands the dovetail slot 28 on the Wobble-plate. From such a disposition of these two slots it will be clear that the tool starting position, as determined by the angularity of crank II, will be the same no matter where pin-roller 29 happens to be located in these slots. The same may be said of the finish positionthat is, at the end of the feed stroke (see Fig. 7)at which point the two slots 28 and 30 overstand one another once again. It follows from this relationship that, no matter these slots, the tool W111 stop reading at mesame point. p In other words, thetoolstarting an'd'finish points being the'same whatever the location of pin-roller 29 along slot 28, the total of jump and feed strokes may be the same-such a relationship only arising if the cam l4 has been designed to give a proper'stroke, ashas been indicated above." f"

It is, of course, to'be understood that theform shown for the track through which the wobbleplate slides is merely for-illustrative purposes. Track courses, giving rise to motions otherthan the straight and rotary travel involved in the instant example, 'may be employed, and these need not even'be of a'discontinuous nature'to accomplish substantially the same result as'is here obtained that is, a relatively fast jumpfeed followed by a working feed.-

Furthermore, while a cam means,'inparticular the cam I4, has been shown as the driving means for cross-slide operation, various other motionderiving means may be used; and such other motion-generating means may include cranks,

eccentrics, or other likemeans. l

Therefore, itis to be understood that, although the invention has been shown in conjunction with a pair of cross-slides operated -'asa unit, the

. features of the inventionmay be adapted to mawhat thevertical disposition of pin-roller 29 in chines having any configuration of slides, in-

' eluding a machine having'all cross slides operating independently of each otherand even several cross slides to a spindle.

We have provided relatively simple means for accomplishing great savings in the-1abor, time, and cost of setting up-machines of the general character indicated. Although this means has been particularly described in a preferred-form in connection with cross slides on a multiple spindle machine, it is, of coursefnot so intended to be limited; and it is 'to beunderstood that various changes, additions, modifications, and omissions may be made within the scope of the invention as defined in the appended claims. -Weclaim:

1. A rocking member for transmitting motion from a driving member to a driven member, pivot means for said rocking member, substantially straight line guide means for said rocking member, driving means forsaid rocking member for bodily traversing said pivot means with said rocking member along said guide means and for rocking said rocking member about said pivot means, and means for pivotally connecting a driven member to said rocking member, for the purpose described.

2. A rocking member for transmitting motion from a driving member to a driven member, pivot means for said rocking member, driving means for said rocking member for bodily traversing said pivot means with said rocking member along a substantially straight path and for rocking said rocking member about said pivot means, and means for pivotally connecting a driven member to said rocking member at varying distances from said pivot means.

3. A rocking member for transmitting motion from a driving member to a driven member, said rocking member having pivot means, means for driving said rocking member for bodily traversing a part of said rocking member including said pivot means and. for rocking said rocking mem ber about said pivot means until said rocking member reaches the final end point in its driven motion, a driven member, and means for connecting said driven member to said rock-ing member at varying distances from said pivot means, while :said rocking memberand driven member are both at the endpoints of their movement, whereby the motions transmitted, to said driven-member by said rockingmember will be varied relatively to each other and said driven member wil-l always be moved to the final end point by said rocking member regardless. -of said relativemovements transmitted to said driven member.

In, a device of-the character indicated, a rocking member for transmitting motion from driving meansto driven means,-means for causing said rocking member to be traversed bodily and subsequentlymocked about pivot means to azfinal'limit of movement, driven means, and means for pivotally connecting said driven means to said rocking means, at various distances from said pivot means without changing the relative positions ofsaid driven means and rocking member at the limit of movement, for the-purpose described. i i

5.- In a device of the character indicated, rocking means for transmittingmotion from driving means to driven means, means for driving said rockingmeans including means to cause said rocking means to be bodily traversed and rocked about pivot means, a driven-member, adjustable pivot means for connecting saiddriven member and said rocking means, said pivot means being adjustable on said rocking means and said driven means along paths on each which are coincident when said rocking means and said driven means are substanially at the final limit of movement in at lease one direction.

6. In adevice of the "character indicated, rocking means for transmitting motion from driving means to a driven means, means for translating spacedpointson said rocking mean along parallel pathsand subsequently stopping translatingmovement of one of said points and rocking the other 'ofsaid points about said stopped point, and means fornconnecting 'a' driven, member to said rocking means, for the purpose described.

- 7. In a device of the character indicated, rocking means for transmitting motion from driving means to driven means, meansfor bodily traversing said rocking means and rockin one point on saidrocking means about another point to a final end point of movement, a driven member,

andmeans for pivotally connecting said driven member and rocking means at various points at difierent distances from the rocking point of said rocking means, said various points of pivotal connection being respectively coincident with each other when said rockin means and driven member are at the end points of movement of both of said members.

8. In a device of the character indicated, a rocking member, limited guide means for guiding said rocking member and constraining the same to move bodily in astraight path, -eng'ageable pivot means for restraining one part of said rocking member when said rocking member is disengaged from said guiding means, a driving member pivotally connected to said rocking member whereby said driving member will bodily move said rocking member when in engagement with said guiding means and will rock said rocking member about said pivot means when said rocking member has been moved beyond said guiding means, and driven means connected to said rocking meansr -9'. In a device of the character indicated, a rocking member for transmitting motion from driving meansto driven means, fixed guiding means and fixed pivot means, said rocking member being engageable with and guided by said guiding means until said rocking member is moved intoengagement with said fixed pivot means, after which said rocking member may rock about said'fixed pivot means, a pivotally mounted driven member, and means for pivotally connecting said rocking member to said pivotall'y mounted driven member. I M

1Q. In a device of the character indicated, a rockingmember for transmittin motion from a driving to a driven member, guidemeans for guiding said rocking member along a fixedfpath of movement, fixed pivot axis means engageable by said rocking member only when moved a predetermined distance along said fixed path and to a point where said rocking member is freed from said guide means and is free to rock about said pivot axis, and driven means driven by said rocking member during movement along said fixed path and while rockin V ARTHUR H. JOBERT. v

JEROME J. TARAVELLA.

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