US1001073A - Skiving-machine. - Google Patents

Description

J. H. PUPE.

SKIVING MAUH'NB. APPLICATION FILED FBB.2,1906.

Patented Aug. 22, 1911.

3 EERSTE-SHEET 2.

J. H. POPE.

SKIVING MACHINE. ArPLIoATIon 111.1111 m1311906, l 1,001,073'. PatentedAug. 22, 1911.

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UNTTED sTATEs AJosEPH n. POPE, or BEoeKToN, MASSACHUSETTS, As'sIeNon To PATENT oEEIcE.l

UNITED error:v

-. MACHINERY COMPANY, 0F PATERSON, ANEIT JERSEY, A VCORPORAZLIOIII' `'OIE' NEW JERSEY.

To all 'whom 'it may concern:

V13e-'it known that I, JOSEPH H. POPE, a citizenof the United States, `residing at Brockton, in the county of Plymouth and 'Commonwealth of Massachusetts, have in# vented ycertain Improvements in Skiving- Machines, of which the following description, in connection Vwith the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts inl-the several figures.

This invention relates to machines for skivingf leather.

In 'the production of counters for use in Ithe manufacture -of boots or shoes, counter Vskiving machines are in use which comprise i' a die roller having a die corresponding in shape to the counter to be produced, a pressure4 device for forcing the counter lblank into the die, and a skiving knife for skiving the' blankwhile in the die. The waste stock or' ofal `'removed from counter blanks by machines of this type consists of ieces'havlimg the"l same length and wi th as the counterblanks, being thickest, however.. at

' theirV sides and ends, diminishing gradually tthin or is perforated by an opening extending longitudinallyl of the piece. In practice,

in thickness fromthe side and end edges' toward Vthe central part of the piece. In operating -these machines little or no material is removed from the central part of the` counter` blank so that the corresponding portion ofthe Waste piece is either extremely thisopening is generally present -and the i inner edges formed by said opening are thin .and ragged. -Heretofore, so faras I amV aware, waste stock of this nature has been regarded; as of` nol particular utility and' hasl` been generally treated as'refuse leather'. It isimpracticable to trim the stock into a "useful shape/,by hand on account of the expense involved, vand no machine `has ever :been ldevised to my knowledge capable of 'performingsuch an oper-ation mechanically. The outer edge portions ofthe stock are of considerable'thickness, however, so that it isidesirable for reasons of economy toutilize 'the stock as advantageously as possible.

.The primar object of my invention is the production o a. machinecapable-of o er- `atin upon stock of this-nature 'tc pro u`ce artic es ofa form useful in the art.

Tothis end 4.I have provided a machine for Specication of Letters Patent.

Application led February 2, 1906. Serial No. 299,169.

fsmvrive-inseamE.

Patented Aug. 22, 1911.

producing from such stock rands or similar articles. This machine is constructed to permit two rands to .be cut longitudinall from opposite sides of a piece of stock suc as that referred to.

In carrying out my invention I em lc mechanism for advancin the waste b an or stock against a suitab e knife orknives arranged to severfrom thel stock a longitudinal strip having the form desired. A rand is cut from one-side of the blank at a time, the arrangement 4herein described being such that tol act upon both sides the blank is fed twice through the machine.

It will be understood that the waste blank referred to variesconsid'erably in transverse section fromV point to point in its len th. For example', at its extreme ends a blan is of the same thickness from one side to the other, whereas 'at 'points Vintermediate the ends it is thickest at its side edges, and gradually decreases in thicknesstoward the longitudinal center line of the blank.` The edges formed byv the irregulary shaped perforation in the blank are very thin and are composed of stock from the flesh side of lthe original counter blank and on this -account and because of their extreme thinnes they are easily torn.

,The mechanism herein shown for feeding the' stock is designed to feed evenly and accurately stock having characteristics such as those above mentioned, and to advance it against the knife or 'knives withoutjmutilabing fthe-portion which is to form a rand.

The stock is guided in its passage through themachi-ne-:by an edge gage which the thick side edge of the blank engages and the feeding mechanism is so constructed as to tend automatically to keep the stock inem-.

skivn-g the 'margin of the blank .is V mounted los evenly and firmly in contact with the gagel 4in stationary position in the path of the blank with its cutting `edge arranged transversely to the line of feed. Little or no material requires to be removed by thisknife from the cent-ral portion of the blank, which as above described, decreases in thickness from the side edges toward the central longitudinal line of the blank. require to be split by this knife by a cut extending obliquely from one face of the blank to the other. At a point intermediate an extreme end andthe center the amount of stock to be removed varies with is arranged in an inclined relation to the face 'of the feed roll in position to remove surplus stock from the opposite face of the blank and lto give said marginal part of the blank a substantially triangular or tapered section at all points in its length The stock is held yieldingly against said feed roll by a presser, hereinshown as a support for the stock.l It is important that during the entire course of the` passage of the blank through the machine the part being acted upon bythe knife be maintained in kcorrect position with relation to the edge' of the knife,v Ifor otherwise the stockwill be inaccurately skived or mutilated by the knife. In lthe machine herein shown the presser is arranged. and constructed to lhold the stock or feed roll at all points in the path of the stock, said presser automatically conforming to and accommodating the variable transverse contour of the blank above mentioned. A convenient construction comprises a presser `support which is yielding-ly held tcward the feed roll and upon which ispivotally mounted the presser, said presser being movable 'in thepa'ssage of the work over it about anaXis parallel tothe line of feed of the work, the point of pivotal support of the presser being so chosen and the arrangement being such thatdlthe face of thepresser may automatically assume aposition parallel to the face of the feed roll or inclined with relation thereto; The pointof pivotal sup-I port and the arrangement of the presser are also such that .pressure is applied by the presser support to the stock .through the presser more particularly `upon the part of the stock closely adjacent to the side edge of the blank. The part of the presser which the thinner portion of the blank' engages r1s The eXtreme ends held in close relation to the feed roll in order to hold said thinner portion in contact with' the roll, but the arrangement is such that the pressure imparted to this portion of the blank may be slight.

l/Vhile the' arrangement may be such that a single knife completely severs the rand from the stock, I-prefer tov employ a knife additional to the skiving knife above inentioned for trimming the thin edge of the rand so that said edge will. bestraight and free from ragged parts. The trimmingknife is arranged with its acting edge closely adj acent to the'edge .of the skiving knife, so that said knives act upon approximately the same part of the stock. On accountof the-thinness of parts of the stock actedupon a rotary trimming knife is employed, such as arotary disk knife having a peripheral cutting edge. This rotary knife is arranged with its cutting edge in contact with-'or in close proximity to the side of the skiving knife at its cutting edge, so that said rotary knife may cooperate with the side of said skiving knife to shear the stock. The trimming knife may be postively rotated if desired. I have found, however, that said knife may be rotated by the stock fed against it and therefore prefer to mount it to freely rotate.

Other features of the invention will be hereinafter described and defined .in .the claims.

In the drawings vwhich illustrate a machine constituting the preferred embodiment 'of the inve1itio'n, -Figure 1 is a view in front elevation of said machine; Fig. 2 is a view in rear elevation of a portion of the machine; Fig. 3 is a viewin side elevation of the machine; Fig. lis a view in perspective of the presser and its supportlgigparts; Fig.

5 is a view' similar to Fi\.-4- showing additional parts and illustrating the operation of the machine;4 Fi. 6 is a view. in perspecy tive of a waste blanr from a counterl skiving machine; Fig. 47 is' a transverse sectional View on the line 7-7 of Fig. 6.

`'In the machine shown yon-the drawings, .1

represents .a frame upon which is rotatably supported a driving shaft 2 journaled in bearings 4c and 6 upon saidframe.. 'Said shaft is provided at its rear .end with tight and loose pulleys 8 and 10, respectively, and to its forward end is secured a feed'roll 12 having a' corrugated or toothed peripheral face for engagement with the Work.

- A bracket 14 extends'forwardly from the -lower partof the frame 1, and in this bracket.

provided -a vertical bore 16 .which is is threaded at its lower end. In the bore 16 is arranged a stem V18 constituting a support for the' presser hereinaftervdescribed. The upper part of the stem 18 ts the bore 16 and is provided with a key i20 entering a slot in the wallsof'said bore 16 and preventing` rotary movement of the stem 18. The lower part of the stem r18 is reduced in diameter, as shown in Fig. 4, and is arranged within an exteriorly threaded nut- 22 which is inserted inthe lower threaded part of the bore 16.- The stem 18 is movable vertically in said nut 22, and between said nut and the upper enlarged portion Vof the stem 18 is arranged a spring 24 which sustains said stem 18 yieldingly. A nut 26 is provided upon the lower screw-threaded end of the stem 18 and by engagement with the nut 22.]imit-s upward movement of the stem 18. It will be "seen that adjustment of the 'nuts 22 and 26 permits the tension of the spring 24 to be varied and the vertical position of the -stem 18 to be controlled.

Upon the upper end of the stem 18 are formed two ears 28. A presser 30 is pivotally supported upon the ears 28 by a pin 32 passing through lugs 34 upon the bottom of the presser` 30 and through the ears 28. The resser* 30 is provided with a depending s ank 3.6""arranged between the ears 28.

A spring 38 is arran ed in the space between the ears 28 for hol the left in Fig. 1. An adjustable set screw 4 0 limits this movement of the shank 36 and a. binding screw 42 is shown for pinchingtogether the ears 28 upon the set screw and holding itin fixed position. The

. shank 36 is free to be moved against the resistance of the spring 38. The bracket 14 is also formed with a vertical bore 43 arranged at the rearv of the bore 16. In the bore4-3 is arranged a standard 44 for supporting a knife holder held from rotation in said bore43 as by means of a key. 'The' standard 44 is scre'wthreaded and nuts 46 and 48, arranged to engage respectively up per and lower faces of the bracket v14 and threaded upon said standard, serve to hold lsaid standard in fixed position, vertical adjustment of thestandard in said bore 42 being lpermitted. The upper end of the standard 44 is provided with an 'arm' 50 i formedI with a horizontal guideway in its up Aer face in which is arranged a slide 52. Said slide 52 is adjustably'held in placeby a set screw 54 passing through a slot in the arm 50 and entering said slide, as shown in Fig'. 2. The slide 52 is formed with two up i standing members 56, between which is 'heldmpon the fornied a. rcurved guideway in which is mounted a knife holder 58. A clamping boltengaging the clamping members is provided to hold said knife holder in fixed position The knife 62 1s adjustably holder 58 by means of a clamp 64, the knife being held between said clamp 64 and a flange 66 upon the holder, a set screw 68 being provided to force the clamp 64 against the edge of the knife. To facilitate accurate adjustment of thel knife a] thumby screw 70 may be mounted upon the 5 holder 58 in position to engage said knife.

ing said shank toward` against the knives.

A bracket 72 is adjustably secured to the upperpart of the framel, as by means of bolts 74 passing through slots in the bracket and entering said frame, as Shown in Fig. 1. A bar 76 is adjustably secured to said bracket 72, as by means of bolts 78 passin through slots in said bar and entering said bracket. The` bar 76 is formed with a hub 80 at its lower extremity, said hub being bored to constitute a bearing for the' stem'82 75 `of a rotary disk4 cutter 84. `Said cutter is freely rotatable upon said hub. The axis of the cutter 84 is located to the rear of the axis of the feed roll 12, as shown in Fig. 3, and the peripheral cutting edge of the cutter is arranged in close proximity to or in contact with the side of the sk ,iving knife 62, and acts upon the stock at approximately`- the same point as the cutting edge of the knife 62.' A thumb screw 86 may be rovided if desired to facilitate vertical adjustment of the cutter 84, said thumb screw being arranged in engagement with the bar 76. An edge gage 88 is arranged at the side of the feed roll with its work engaging face approximately in line with the inner corner of the knife 62. Said edge gage is support ed by a 'bracket 90 havingslots in which bolts 92 are arranged,said bolts entering the frame 1. The slots in said plate permit adjustment of the edge age 88 transversely to the line offeed of t e Work. The edge gage is secured to said bracket by bolts 93 passing through vertically arranged slots in said gage into said bracket, the slots permitting vert-ical adjustment ofA the edge gage. I have shown a guard/94 also sustained by bolts 93, saidguard `being constructed to cover the lower exposed art of 4the feed rolln so that liability of'injury to 105 the operator through accidental contact with said roll is prevented. The horizontal adj ustment of the edge gage permits the width of the randsproduced to be varied.`

lVhere the stockoperated upon is of the character illustrated in Fig. 6, having an irregular perforation in its central part, there is some liability of thev stock catching upon parts of the'machine as it is advanced y To guard against this contingency I have shown `an arm 96 arranged to su port the 4part-sof the blank not sustained liy the presser 3,0. The arm 96 is secured to the bracket 14 and is,` rovided at its upper end with a linger 98`adjustably 12. clamped in fixed position so that its inner end maybe brought as close as desired to the edge of the presser 30."

I have lshown a hand lever 100 pivoted 'at one end upon the frame 1 at 102 and hav- 125 ing intermediate its ends a perforation entered by a stud 104 projecting laterallv from the upper end ofthe stem 18.- Said hand lever permits the stem 18 to be vmanually de-pressed when desired--for example, in 13.9

' lcase itisldesired ltoremove a b1` 1k i .'L'the. presser, lsaid `roller being freely rota-A table in said cavity, it ,being j ournaled at one fend upon; a pin`A 108, and at the other end Iupon. the end-of a threaded pin 110, held ryin,fixed.position by a set nut 112. As shown in Vthe drawings, the axis of the roller 106 is substantially in vertical alinement with the 'axis of. the Vfeed roll 12 so that said roller i'supportsbthe stock at the point Where the .greatest pressure is applied by the feeding mechanism.. A

vIn adjusting the several parts ofthe ma'- chine-shown in vthe drawings the skiving knife-is preferably arranged with the outer ucorner or end of its cutting edge substantially in vertical aliement with the outer edgeof'the feed roll. The center of curvatureof the guideWay formed between -the 'clamping members is in line with said `outergcorner of the cutting edge, so that movement of `the lholder 585m said guideway does not change the position of said corner of` theknife. .'It. will be seen, therefore, thati the angle ofiinclination'of the knife to xthe Afacey of the feed roll may be changed ,as desired .Without necessitating alteration in position; ofthe slide52 uponthe arm 5U'. .It will beunderstood that it may be desired to cliangevthe inclination of the skiving knife according to4 different circumstances. For

im example, wherethe stock is thinlthe knife may begivenlessvangle of inclination to the rfacefof the feedrolllthan there the stockFis thicker, in orderthat therands pro' duced maytaper'from'on'e side of the strip f toA the other. ,-The; knife' is-'adj usted -hori.

Zontally .by thefthumb screw to bring its cutting edge asnear as practicable to the center, of lthe feed roll7 said knife being also adjusted vertically' by movement of the standard 44 to bring fthe outer cornerof the., cutting edge -in substantially horizontal alinement; with .the loWermost portion of tlieouter edge ofthefeed roll. .The-rotary knife, ,84A is-positioned torotate freely vin 5f close. pregimitytopor .in ,contact with the sidepf fthev knife and its :cutting edge lis arranged z tpproitimately at the outer corner of thecutting edge ofsaid knife. i. y, t The1 stemi 18 which supportsA the. presser Bid-@shouldihold the, 'Workgagainst the feed.

roll' with suflicient'l pressure to insure the fleeding.of,..th,e Work. against 'the knives.l linut: I26.*constitutes a stop tolimit yupward movement., if Sad...stem andthe/:111111,26 and;

'gaf mit 252.4. cpnstitute means whereby the@ ten-if sionl'offth'e lspring 24 may be varied. Itis is particularly luseful.-

In the operation of-the machine shownag the end of a Waste'blank, such as'shown th'e drawings-,fis placed in vpositionV tofbe'f drawn through the machine by the continumovement of the presser. in ordertp keep the presser from coming in contacty with the desirable' to provide a stop to limit upward i `rotary feed roll, since contact of these two devices would cause them to injure one another. Moreover, by holding thev presser slightly removed from the face ofjthe'` feed roll introduction of the stock is facilitated.

Thetension of the spring 24 having been `3 suitably adjusted, the stem 18 maybe ladjusted vertically to such a position that the feed roll bears upon the work'with `suiiieient pressure-to feed it. `The stop formed the set screw 4.0 should bei` so adjusted that 'I When the stem 18 is at the limit of its Lup- Ward movement the outer part of 'theiwork supportingv face of the presser will' lie* in close relation to the face of the" feed Toll,

Without, however, coming in contactftherel With. It Will'be observed from Fig. -lthat the axis of the presser 3() is substantially in vertical alinement With the -actingS-*face'ofr` the edge gage. -It will be seen, therefore,

that the spring 24 exerts a greater pressure upon the slt-rip of stock at the edgenext to. the edge gage than at points adjacent the roi tary knife 84. The pressure applied to the stock at the' latter points is controlledindependently of the Pressure llpOn-the' edge portion by means of the stop L1:0 and spring 38. The spring 38 is preferably consider'- ably weaker than ythe spring 2li-for eX#` ample, of a tension merely sufficient to hold the outer margin of the stockin Contact with the outer part of the -feed roll without exerting any considerable pressure upon? it. The stop 40 also controls the pressure applied to the outer margin of the stock since, it limits movement `of the .outer part of the*i presser toward the feed roll. f

I have `found that'the feeding'mechanism hereindescribed automatically holds ythe edge of the stock in contact with the edge gage 'Whether said edge be strai htfo'r curved. It will be seen that theI feeding mechanism acts more particularly upon the:

edge portion of the stock, and I have found:

this featurel to be of advantage7 intending'. to swing the stock against the edge ga e Where the edge of the stock' is;,c`urVe for example,vin operating upontlie 'curvedside of the blank shown-in Fig. 'G4-this. tendency -of .the feeding mechanism.. to hold fthe blankin enga-gement with the edge gage machinelwithits skived side uppermost, as'` I have found that ,the feedyrolLaCtS"more advantageously up'on this yside Aof the stock ineontact Withtheedge gage.v f Theblank is preferably presented to the f y the presser isy depressed by the blank so that said presser assumes an approximately horizontal position, and as the blank is advanced the presser conforms to the varying inclination of the lower face of the blank and sustains the stock evenly in Contact with the feed roll. The blank is advanced by the feed roll against .the edges of the skiving knife and trimming knife, the skiving knife removing surplus stock from the lower face of the marginal part of the blank and the i trimming knife trimming the outer edge of the strip acted upon by the skiving knife. As the stock is advanced the trinimingknife -is rotated by the stock and since the stock 1" acted upon by said trimming knife is supported by the side of the skiving knife, the edge of the stock is evenly sheared off by saidA rotary knife.. fhen a rand has been 4 cut fromv one side of the blank the blank may be turned end for end and passed a secondtime through the machine to sever a rand from the opposite side.

Having described my invention, I claim as new and desire to secure by Letters Patent of the United States -1. A leather skiving machine, having in combination, askiving knife and means for advancing the stock against said knife constructed to grip the stock with a pressure progressively increasing from point to point in t-he Width of said stock, and arranged to maintain aiface of the stock at a predetermined inclination to the edge of the skiving knife. i 2. A leather skiving machine, having in combination, a skiving knife and means for advancing the stock against said knife coniprising a feed roller and a presser having a vpredetermined .acting surface formed to hold the stock `in engagement With said roller, and means for yieldingly holding the presser toward said roller constructed to exert a lless pressure upon a predetermined portion of the Width of said stock than upon other portions.

3. A leather skiving machine, having in combination, a skiving knife, an edge gage .for positioning the stock in proper relation ing a. pr letermined transverse acting surmeans for varying the pressure appliedzto a margin of the stock lWithout affecting the pressure applied to the opposite margin of said stock.

5. A skiving machine, comprising ,'a feed roll arranged for rotationabouta stationary axis, ,a skiving knife arranged yin the path of the stock, and mechanism for holding the stock in engagement Withpsaid roll, comprising a presser support, means for yieldingly holding the supporttou'ard the feed roll, and a presser pivotallysupported upon said support, said presser beingkmovable about an axis approximately parallel to the line of feed of the stock.

G. A skiving machine, comprising a feed roll arranged for rotation about a stationary axis, a knife arranged in the path of the stock, an edge gage for positioning the edge of the stock, a presser for holding the stock in contact with the feed roll, said presser being movable about an axis approximately parallel to the line of feed of the stock and approximately in line with the acting face of the edge gage, and means for holding said presser yieldingly toward the feed roll.

7. A machine of the class described hav` ing, in combination with mechanism for feeding and skiving stock, a rotary disk knife for trimming the vskived stock, said knife being mounted for movement in the line of feed and arranged to be rotated by the stock as it is fed, and means permitting vertical. adjustment of said knife.

8. In a machine of the class described, the

combination with mechanism for feeding the stock, of a skiving knife and a rotary trimming knife arranged in the path of the stock, said trimming knife being mounted with its cutting edge adjacent to the side of the skivinfr knife in position to act u on stock sustained-by said skiving knife an to coperate with the side of the skiving knife to shear the stock.

9. A leather skiving machine comprising a skiving knife, a feed roll arranged for rotary movement about a fixed axis and a presser constructed to hold thestock in engagement With the feed roll Qthroughout substantially the entire Width acted upon by the skiving knife arranged to exert different degrees of pressure upon opposite margins of the strip of stock acted upon by the knife.

10. A leather skiving machine, having in combination, a feed roller arranged for rotation about a stationary axis, a skiving knife positioned in the path of the stock and arranged for adjustment about a longitudi-` nal axis in line With a corner of the cutting edge of the knife, a presser arranged to act upon substantially the. entire area ofrthat y a ltofoperagte Iupon Stock 10' iraniana means whereh fsa ielaingly hamm ma PIVGIH .resilient f terrier toward rska'tlk L .resilient means for turning,

savia premi m11 vabout, said pivotal @mction. i" f 113. A machine for yoperati-ngupong stock Y y .l f which is triangular in ckrossecti'on *con-1# A *the described hevin 'mmhnatom :e le'ed roll, fa ,presserl prisinga feed rol-"l having a stationary axis, -amember having a movable Aaxis en resizleni'l means tending to'oa-use angurlfr movement of .the faxlis 'of sad'pressr wheneby/Bll points insad .ife i fed forward `at uniforms eed. `f Y In lwhereof 'have `signed"x ny name to A'this1specificintim-1in the 4presen'oef'of .30 vrtw@Islibscribin'g witnesses.V j

. JOSEPHITT. POPEQF Witnesses: y

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