US1623638A - Copying lathe - Google Patents

Description

Apnl 5 1927 H. A. SCHUL-rz COPYING LATHE Filed March 29, '1924 5 Sheets-Shea?. 1

-COPYING LATHE Filed March 29, 1924 5 Sheecs--SheeiI 2 Y 1 623,538 April 5, 1927. H. A. SCHUL-TZ COPYING;` LATHE Filed March 29; 1924 5 sheets-sheet s April 5, 1927. 1623,638

H. A. SCHULTZ COPYING LATHE Filed MaIOh 29, 1924 5 Sheets-Sheet 4 April 5, 1927. 1,623,638

f HQA. scHULTz COPYING LATHE Filed March 29, 1924 5 Sheets-Sheet 5 /00 l E07? v/arma@ @6&2 z.

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Immun A. scrIULTz, Y

l THE '.rowNsHIroF MOHENBY, ILLINOIS.

4to lathes COPYING LA'II'IE.-

nppncation mea Maren 29,'1924.l serial no. 702,812.1

Myfinvention relates, more particularly, provided for the manufact-ure of shoe-lasts and more especiallyv graded shoel'asts and of the type comprising, as an ele-l ment, a ,swing-frame. which, in lathes of this` type as colnmonly provided,fhas revolubly.

mounted thereon the lpattern and the work, to cooperate with a pattern-follower and the cutter, respective y. v

The grading of the lasts to be produced by machines of this type is accomplished by the provision of mechanism controlled by the swinging movements of the swing-'frame and operatinfto produce a differential movement of the pattern-follower relative to the cutting mechanism which operates on the work, and as the swing-frame moves in'an ar, it is thus impossible to produce graded lasts from a pattern, which shall present eX- actly the same contour as the pattern but of enlarged, or diminished, size, as the case may be. Furthermore, even in' the case of making a last of the pattern size it is not possible to produce such a last of exactly Vthe same contour asthe pattern due to the swinging of the frame in an arc.

As machines have been hitherto Idirovided,l

. the error above referred to, especially in the case of the larger sizes of lasts produced, is so great as to present great objection in the manufacture of lasts, and it is my primary objectto provide ,improvements in machines of the swing-frame type to' the 'end that the error referred to and occurring nthe lasts will be so minimized as toV be practically negligible, the lasts produced, for all practicalpurposes, having the `same contour as the pattern exce t of enlar ed .or diminished size in the case of grade lasts.

In explanation of the production of the f objectionable error in the lasts above referred to in the case ofmachines as hitherto constructed, it may be statedtha't the parts of the machine are so proportioned and arranged that the swinging movementstof,

vthe frame in the ordinary movements thereof in producing a last are wholly to one side' of the vertical plane in which the pivot of i the swing-frame extends, and this I overswinglng movementsl 'swings come, generally stated, by so. proportioning and arranging the Apartsthatthe frame in its at' -opposite sides of such vertical plane.

- -iAnother object is to provide improvements in lathes of the general character above reoFeHIcAGo, ILLINoIs, AssIGNon 'ro CHARLESV Arequiring to be operated positions they nnnnnorpractical operation at relativelyrapid speed, 60 without causing the lasts produced thereby to present Vany greater degree of error above referred to, than is produced in machinesas hitherto provided where a swing-frame presenting a long lever-arm,

at relatively slow speed, is provided. I' f While my invention applicable enerally to machines of the type above re erred to, I have devised itrforenibodiment i especially in 'a machine of the-general construction shown in the pending application of Charles E. Reed for United States Letters Patent, Serial No. 650,194, filed Ju1y 7, 1923, and have therefore chosen` to villus- 75 trate it in such machine without, however, intending to be understood as desiring to limit the invention thereto.

Referring to the accompanying drawings:

Flgure 1 is a`vi'ew in front elevation of a so machine of the general' construction disclosed in the above referred-to pending applica-` tion, showing the machine as equipped with my present improvement. Figure 2 is an end view thereof, viewing 1 and the swing' frame swung out forwardly to lockedv inoperating position. Figure 3 is a plan view of ythe machine'with the upper works thereof shown in section and the swinging frame 90 removed. Fi re 4 is an enlarged section 'taken'at thehne 1f-4 on Fig. 1 and viewed in the direction being shown in the position illustrated in Fig. 2; and Figure 5, an enlarged broken 95 e upper swing-frameequipped Y view of th portion of the machine, the machine being viewed from the left hand side ofFig. 1," with certain ing the swing-frame and its ing mechanism, by full lines in one of the may occu of the machine and by position in which they may extend.

c XReferring to the particular illustrated ma- 15f chine, which isadaptedfor the turning 'of lasts of the pattern size or graded, as desired, the same comprises a frame 25 providedad jacent its rear side with a guide-way 26 and adjacent its front side with and consequently 35 more 70 v the machine from 35 the right hand end in Fig.

of the arrows, the machine 'i y in the operation, otted lines another upwardly-ex- 11o parts removed, this view. show- 'i f counter-weight-A 100 members 30. Mounted on the guide-,ways 26 and 27 is a slide 31 which carries the cutting mechanism for cutting the work mounted in the swing-frame, as hereinafter described,

this cutting mechanism, corresponding with the cutting mechanism of the said pending application, involving, generally stated, a roughing-cutter 32 formed of a plurality of toothed disks of'successively larger diameters flatwise disposed on a shaft 33 driven from the shaft of a motor 34 secured on the slide 31, through the medium of a gearing (not shown) located in a gear-housing 35, the cutting portion of the roughing-cutter 32 being of general frustro-.conical form as shown. The cutting mechanism also coinprises a finishing cutter represented at 36 formed of diametrically-opposed cup-sliaped cutters 37 and 38 mounted on a shaft 39 and driven from the gearing in the housing 35.

Mounted on the guides 26 and 28 for movement in a direction lengthwise of the machine, is a sli-de 40 provided with guides, extending crosswise of the machine, on which a slide 41 is mounted to be movable longitudinally thereon, the slide 41 carrying the pattern-follower represented at 42. The slide 41 is provided witha rearwardly-extending plate 43 (Fig. 4) mounted in a slide 44 vertically adjustable on the main body of the slide 41, the plate 43, opposing the front face of a plate 45 extending lengthwise of the machine and trunnioned at its opposite ends, as represented at 46, 4to the frame to rock crosswise of the machine on a horizontal axis, the plate 45 being provided with an upwardly-extending arm 47 operatively'enga ing with mechanism hereinafter described for causing the plate 45 to be rocked, responsive to the swinging movements of the swing-frame hereinafter described and coinprisiiig a link 200 having pivotal connection at its rear end with the lever 47 as represented at 201, and similar connection at its forward end with the swing-frame referred to, as indicated at 202. The slide 41 is caused to bear, at its plate 43, at all times, against the front face of the plate 45, through the medium of a-spring 41a whichis attached at one end to the slide 41 and at its opposite end to the slide 40.

The slides 31 and 40 are operatively connected together through mechanism for causing them to move simultaneously in the same direction lengthwise of the machine, either at the same speed, to produce a last of the exact size of the pattern hereinafter referred to, orat different speeds, to produce graded lasts, the said mechanismL shown being the same as that illustrated in the said pending application, and comprising, generally stated, a bar 48 pivotally connected at one end to the slide 31, as indicated at 49, this bar being formed of lengthwise-adjustable sections 50 and 51 to vary the effective length of the bar 48. The end of the bar 48 opposite that at which it connects with the slide 31 is pivotally connected, as indicated at 52, with the upper end of a rack bar 53 slidable up and down in a bar 54 slotted at its lower end, as indicated at 55, through which slot the pivoting stud' 56 of a clamping device carried by a stationary bar 58 and adjustableA up and down on the latter, extends, the bar 58 being rigidly connected, at its oppo. site ends, with the frame of the machine, as shown. The bar 53 is pivotally supported on the slide 40 through the medium of a pivot 59 and carries a rack (not shown) which meshes with a pinion (not shown) in a gear-case 60 carried by the bar 54, the pinion referred to being rigidly secured to a shaft 61 which is provided with a' crankhandle 62 through the medium of which this pinion may be rotated to adjust the bar 53 lengthwise of the bar 54, it being understoodthat by varying the relatively movable members forming the connecting mechanism described, the slides 31 and 40 may be moved simultaneously at the same speed for the production of a last of the same length as the pattern, or different speeds, to produce longer or shorter lasts, as desired. The mechanism for moving the slides 31 and 4() lengthwise of the machine to feed the pattern-follower and the cutting mechanism along the pattern and work, respectively, mounted in the swing-frame referred to, comprises, in the particular construction shown, a shaft 63 journaled in a bearing 64 which has slight rocking movement in a vertical plane on the frame of the machine, one end of this shaft carrying pulleys (55, connected by a belt 66, with pulleys 6T secure( to a shaft 68 forming the main driving shaft of the machine and driven from a motor iepresented at 69. The other end of the shaft 63 carries a worm 70 which meshes with a worm-wheel 71 secured toa shaft 72 jour. naled on the frame of the machine and mesh-- ing with a rack depending from the slide 31, the parts being so constructed and arranged that, when the worm meshes with the worm-wheel 71, the slide 31 will be driven from the shaft 63 to the left in Fig. l, and through the medium of the lever mechanism vhereinbefore described and connecting the slide 31 with the slide 40, the latter will be simultaneously moved in the same direction with theslide 31, at the same speed, or at a different speed therefrom, depending upon the setting of the said lever mechanism. The machine shown is provided with means for effecting the automatic arresting of the drive A present invention has nothing to do with this tion thereof is omitted.

Referring now: to the swing frame of the mchinefand hereinafter referred to, thisv frame is' represented at 7 3, and forms a I swinging Support for the pattern 7 4 and the wood-blank 75, from which a last is to be formed, which are rotatably mounted therevvin,`and in the operation of the machine are rapidly rotated, all as hereinafter described.

The swing frame 73 is jouinaled', in the particular construction shown, at its upper ends on theframe standards 29 at hollow trunnions 76 secured in the upper ends of the side arms 77 of the swing frame 73. The

trunnions 76 form journals for a shaft 78 ex-l tending therethrough and carrying the stepped pulleys 79 through the medium of which it is driverr to -rotate the pattern 74 and work 7 5, as hereinafter described, by the belt connectionBO with other belt pulleys 8l secured on the sha-ft 68. The pattern 74 is mounted on' a head-stock 82 and a tail-stock 83, and the work 7 5 is mounted on a head-stock` 84 and a tail-stock 85, to respectively oppose the pattern-follower and cutting mechanism hereinbefore referred to. The means shown, and which are theV same as those of the herein-before-referred-to pending application, for

rapidly rotating the pattern 74 .and work 75, either in vthe same,or opposite, directions, as desired, comprise, generally stated, a shaft L86 journaled onv the frame and geared tothe spindles of the head- stocks 82 and 84 to cause thelspindlesto operate simultaneously, by gearing located in housings 87 and 88 on the frame'73, and a shaft 89 conopposite sides of the said vertical plane. I Vhave found yit'vdesirable to so locate the axis nected with vthe gearing referred to and 'journaledv on this frame. The shaft 86 is driven, throughU the medium of bevel gears (not shown) located inthe housing 90, through the medium of ay shaft 91 having bevel gear connectionA at y92 with the shaft 78.

' In accordance 'with my invention, as hereinbefore stated, the parts of the structure are so'proportioned andV arranged that the swing frame 73, in the operation; of turning a last, swings alternately from one slde -to the other, .of the vertical plane in which .extends theaxis about which the frame 73 swingsLit being preferred that the parts be so .proportioned andarranged that the frame 73 in. the operations of turning a last such as those of theform now commonly manufactured, will swing, in its extreme movements, substantially the same distance, at

upongwhich the frame l73 swings,l that the alined axes about which the 'pattern and work rotate extend totheleft of the vert-ical aliningiaxes are co-incident with the lextreme forward point on the follower, as illustrated by the full lines in Fig. 5, assuming that the follower is lined up with thel cutting mechanism. Such disposition of the parts very materially reduces the error above referred to, but to stillY further minimize such errol` the portions ofthe head and tail stocks 'in which the pattern and work are mounted are so disposed that their alined axes will extend a slight distancer below the forwardmost point on the follower when the swing-frame is in vertical position.

By way of example and assuming that the distance from the axes of the work and pattern to the pivotal support of the swing frame is thev same as in machines as now commonly provided, the axes of the work and'pattern would preferably extend below the plane in which the forwardmost point of the follower extends, about l/ft of an inch, when the swingI frame is in "ertical position. 'g

In explanation of the advantages of so locating the axis about which the swing frame 7 fextends that the swing frame will swing to both sidesl of the vertical plane in which its pivoted axis extends, as above described, it may be stated that theideal arrangement, from the standpoint of fully eliminating error in the lasts, would\ be to mount the pattern and the workon a member which would slide in a straight line toward and away from the follower and cuttingfmechanism. However, in practice it is desirable to use :i swing-frame for the pattern and the work, and

thus the pattern and-the work move through tions, swings to'one side only of the vertical plane in which the axis upon which theswing frame swings, extends.'l In designing a mavchine to embody my invention, the designer, to properly locate the axisabout which the `swing-frame swings, gelative to thev patternfollower, would first determine the length of the arc through which the pattern and the work move in the movement of the frame from one to the other of itsextreme positions in the` cutting of lasts of the form` commonly produced, and then locate the axis 'of the swing-frame so that when this vframe is in the full line position shown in Fig. 5.v

AinL which position the alined vaxesof the pat; `tern and the work are substantially coincidentwith the forward point on the follower. these'L alined axes will extend to the leftcf Cil lll

the vertical plane in which the pivoted axis of the swing-frame is located, a distance equal to substantially one-half of the length of-the arc referred to. Y

It is necessary thatthe pattern 74 press against the pattern-follower'42 at all times,

in the operation of the machine, whereby inv the rotation of the pattern the frame 73 is caused to oscillate byvirtue of the rotation of the pattern against the follower, to the l end that the blank, or work 75, will, in its rotation, be cut to present the same form as thel pattern. The particular illustrated mechanism for this purpose comprises a belt 93 at each end of the machine, thewforward end of each Ibelt being connected with the lower portion of the frame 73 at each end thereof and extending over pulleys 94 fixed on the ends of a shaft 95 journaled on the frame of the machine and provided with a sprocket 96 connected by a sprocket chain 97 with a sprocket 98 secured to the shaft 78,

the shaft 95 being thereby .rotated in clock-` wise direction in Fig. 2. The belts 93 extend from the pulleys 94 to pulleys 99 rotatably mounted on shaft 100 and areprovided at their free ends with weights 101.

The weghtedbelt devices described, by reason of the constantly rotating shaft 95,

operate to exert against the swing-frame 7 3,

at all times, force in a direction to swing the frame 73 in counter-clockwise direction in Fig. 2 and serve to exert a snubbing action on the frame, preventing rebounding of the latter -away from'the pattern-follower and Fig. 5, will tend to swing to the right in,

this figure and consequently away from the -pattermfollower and cutting mechanism and when this frame swings to the right of said vertical plane, as shown by dotted lines in Fig. 5, '1t will tend to swing toward the pattern-follower and cuttingl mechanism,

means are' shown for compensating for this condition, these means, which, however, form no part of my invention as they were devised by one Charles E. Reed and form the subject of an application for United States patentJ Serial No. 702,813 filed by him on March'29, 1924, and copending` herewith comprise the following described mechanism: Rigidly secured to theends of the shaft 100 are upwardly-extending levers 102 each provided with a weight 103 at its upper end, these levers being similarly positioned on the shaft 100and each connected,

through the medium of a link 104 pivoted thereto at 105, with levers 106 rigidly secured to the ends of a `shaft 107 journaled in the frame of the machine. tions between the link 104 and the levers 106 The connecare pivotal as represented at 108 and located between the ends of these levers, and

insuring'against deflection of the swingframe in the operations of the machine. It will be noted that in the particular construction shown Athe distance from thea'pivot points 105 to shaft 100 is much less than the distance' from the pivot points 108 to the shaft 107, whereby the everage is compounded thus causing the levers 102 to swing throughgreater arcs, than the swing-frame, and thereby effectively counterbalancing the latter.

The lever mechanism just described, and as shown, is so arranged that when the swing frame is in vertical position the levers 102 extend vertically upward and when this frame extends to the left in Fig. 5 as shown in full lines, these levers extend to the left as shown in full lines, and when the swing frame extends to the right of the vertical as shown by dotted lines, the levers 102 also extend to the right of this ligure as shown by the dotted lines, the levers 102 thus serving to substantially counterbalance the force exerted by gravity against the swing frame and tending to swing the latter to vertical position. While the arrangement is such as shown anddescribed that when the swing frame is vertical the levers 102 are vertical, it may be found desirable, under some conditions, to so modify this arrangement that the levers 102 will'be slightly inclined in one direction, or the other, when the swing frame is vertical.

`It will beyundersftood from the foregoing that in the illustrated embodiment of my invent-ion, the force exerted bythe frame in the direction of the pattern-follower and cutting mechanism is determined by the force exerted'on the belts 93 which, in the preferred construction shown, depends on the speed at which the shaft 95 rotates and the weight of the bodies 101.

While I have illustrated and described a particular construction embodying my invention, I do not wish to be understood as intendin to limit it thereto as the same may be modi ed and altered without departing from the spirit of my invention, and, as

will be C'readily understood, the invention may be incorporated. in a machine 1n which the swing-frame isy piifotaliy supported be- Idw the axes of the work 'and` pattern, las Well as in a Imachine lin which 'the pivotal support is above said axes. f

What I `claim as new, anddesire toisecure .by Letters Patent, is:

lIn a last lathestructu're, lthe combination of a pattern-followerand cutting mechanism,a. swing-frame supporting a pattern and the work for cooperation with` said n Y n Y' n follower and rcuttingmechanism, respectlve- -1y and grading mechanism with which the swing-frame and pattern-fo lower are connectedmthe axisupon whlch said frame swings beingso located that said frame, in the cutting operation of the machine, swings to both sides of the'vertical plane iliiwhich said axis is located. e

. HERMN A. sCI-IULTZ.

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