US2651933A - Skiving machine - Google Patents

Description

Sept. 15, 1953 M. H. ROSKE SKIVING MACHINE 4 Sheets-Sheet 1 Filed Sept. 8, 1949 [nvenior e d m w H Z n MM Sept. 15, 1953 M. H. ROSKE SKIVING MACHINE 4 Sheets-Sheet 2 Filed Sept. 8, 1949 Zhventor Milton #Eooke Sept. 15, 1953 M. H. ROSKE 2,651,933

SKIVING MACHINE Filed Sept. 8, 1949 4 Sheets-Sheet 5 0r Milton /7( Quake lu'dfiorge I Sept. 15, 1953 M. H. ROSKE SKIVING MACHINE 4 Sheets-Sheet 5 Filed Sept. 8, 1949 0r Milton/f Quake hwfiorne Sept. 15, 1953 M. H. ROSKE 2,651,933

SKIVING MACHINE Filed Sept. 8, 1949 4 Sheets-Sheet 4 Inventor Milton h. Qoake Patented Sept. 15, 1953 SKIVING MACHINE Milton H. Roske, Malden, Mass., assignor to United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey Application September 8, 1949, Serial No. 114,635

13 Claims. 1

This invention relates to skiving machines, and more particularly to a skiving machine for preparing the edge of a shoe upper part, or other work piece, for a folding operation as performed by the improved folding machine disclosed in United States Letters Patent No. 2,526,691, granted October 24, 1950, upon my application, the fold produced by this machine being characterized by its narrowness.

It has been a common practice in high quality shoemaking to finish certain exposed edges of upper parts by folding the margin of the material upon itself so that these edges are covered by the grain side of the material, and therefore have the same appearance as the rest of the exposed surfaces of the upper parts. Excessive thickness of the finished edge is avoided by skiving the margin of the work to a thin feather edge. Hence, after the fold has been made, the thickness of the folded portion is no greater than that of the rest of the work.

l-leretofore, it has been considered necessary that the skived margin of the work be wide enough to overlap the unskived flesh side of the work, that is, of a width which is a multiple of the thickness of the stock. It is evident that this practice results in appreciable waste, since a considerable area of stock is given over to the folding allowance. Moreover, when the skiving cut is made on a gradual taper, as is commonly the case, the flexibility of the thinly skived margin tends to make the gaging of the work erratic during the folding operation, and to the extent that the width of thefold varies, the final shape of the work departs from that desired.

In view of the foregoing, an object of the invention is to provide an improved skiving machine for producing a skiving cut so extremely narrow that the width of the feather to be folded around the edge of the work is approximately equal to the thickness of the stock. By this expedient the folding allowance is reduced to a negligible amount with a corresponding saving in material cost. A further object is to obtain, in a skived edge of this narrowness, an abrupt shoulder which will facilitate the gaging of the work during the folding operation and establish a fold-line parallel to the edge of the work, thereby insuring a true contour in the folded edge.

This form of skived edge is produced by the illustrated machine because of the provision therein of novel work forming and feeding means constructed and arranged to impart an abrupt and well defined bend in the work close to its edge, and to present the work to a skiving knife in such a manner that the bent margin is skived to a thin feather from the vertex of the bend outwardly to the edge. Because of the sharpness of the bend in the work when the skiving cut is made, the portion of the cut extending from the vertex of the bend across the flesh side of the work forms an abrupt shoulder, when the feather is straightened, around which the feather is ultimately folded by the use of my improved machine mentioned above, without overlapping the unskived flesh side of the work.

The above mentioned work forming means comprises a feed roll which is distinguished from feed rolls of usual form by a narrow rim at one end of the roll, the width of the rim being approximately equal to the thickness of the stock to be skived, Contiguous to this rim is a flaring portion, the surfaces of the rim and the flaring portion being disposed at an angle to each other and forming a definite ridge at their junction over which the work is abruptly bent. Invention is to be recognized in the combination, with such a feed roll, of a presser foot constructed and arranged to hold the work closely against the feed roll at and at each side of the above mentioned ridge.

In order that the feed roll and presser foot shall have as effective a holding action upon the work as possible, inwardly from the margin to be bent, the width of the flared portion of the feed roll and the corresponding portion of the presser foot is considerably greater than the width of the rim. It is therefore certain that all portions of the work in which the bend and skiving cut occur will be held closely against the roll, and that the abruptness of the bend necessary for producing the above-mentioned shoulder at the edge of the work will be obtained.

Contributing with the above-mentioned work forming means to the formation of the shoulder, as well as to the extreme narrowness of the skiving out, is the fact that the illustrative knife is tubular and of small diameter. It is evident that the curved cut made by such a knife spans a narrower margin of the work and extends more directly through it than does the cut made by a disk knife or one of any other form.

Another object of the invention is to obviate, as much as possible, any tendency of the work to become jammed in the machine during the skiving operation. To this end, the invention provides an improved yielding drive for the usual feed disk which cooperates with the feed roll to feed the work, and also an edge gage so disposed with respect to the presser foot and feed roll that the clearance space between these latter members and the gage extends crosswise of the work and the direction of pressure exerted by the work on the gage.

Other novel structure which provides for the disposal of. the skiving chips made by the illustrated knife forms the subject-matter of, and. is claimed in, another application Serial No. 305,217, filed on August 19, 1952, as a division of this application.

These and other features of the inventionwill' now be described in greater detail and will. be defined in the appended claims.

In the drawings,

Fig. 1 is a front elevation of an illustrative machine embodying the invention;

Fig. 2 is a side elevation of the machine as viewed from the left;

Fig. 3 is a plan view;

Fig. 4 is a front elevation illustrating, at an enlarged scale, the operating instrumentalities' of the machine and the relation of a work piece to them during a skiving operation;

Fig. 5 is a magnified front elevation of portions of the operating instrumentalities adjacent to the point of operation of the knife on the work;

Fig. 6 is a magnified and diagrammatical View illustrating a portion of the feed roll in front elevation and the form of the skiving cut made upon the work;

Fig. '7' is a sectional elevation of the knife its mounting, the section being taken vertically through the axis of the knife; and

Fig. 8 is a perspective view of portions of the 1 feed roll, presser foot and edge gage.

The illustrated machine comprises a rotary feed roll l9 (Figs. 1 and 4') having a novel form, as will be more fully pointed out later, and comprising a hub l2 at one end, a narrow rim is at the other end, the rim and hub being connected by' an intermediate fiared portion it. A work piece W to be skived is positioned with its edge flush with the outer end of the rim i i by an edge gage 18', upon which is pivotally mounted at 28 a presser foot 22 which holds the work against the feed roll throughout the width of the rim id and flared portion It, as illustrated in Fig. 5; to form an abrupt bend in the work very close to its edge.

Immediately behind the presser foot is the cutting edge of a tubular knife 24 which is sharpened with an outside bevel (Fig. '7). A feed disk 26' holds the work W, adjacent to the presser foot, against the hub [2 of the feed roll, and cooperates with the latter to advance the work toward the knife.

With the machine in proper adjustment, it produces a skiving cut, as illustrated in Fig. 6, by which most of the material is removed from a narrow margin of the work at the flesh side leaving a very thin feather 28, the length of which is about equal to or even less than the thickness of the stock. This feather is bent out of the plane of the rest of the work when the skiving cut is made. When the work piece is removed from the machine the feather straightens out (into its broken line position Fig. 6), and then projects from an abrupt shoulder 38 which results from the angular relation between the knife and the flared portion [6 of the feed roll.

This skiving out is characterized by its extreme shortness, reduces the skiving and folding allowances to a minimum, and prepares the work most 4 advantageously for the formation of the narrow fold at the edge of the work which is produced by my improved folding machine referred to above.

The knife 24 is threaded into a sleeve 32 (Figs. 2 and '7) and is positioned in coaxial relation therewithby the engagement of a tapered shoulder 34- on the knife with a complerrrental. socket formed in the' sleeve. The sleeve is mounted to rotate freely upon ball bearings 36 which are carried by a housing 38, the latter being fixed in. position and being rigidly attached to a standard 40 which extends upwardly from the base 42 of the machine. The knife is driven by a belt 44 which runs over a pulley 4B, the latter being threaded on the rear end of the sleeve 32 and being arranged tolhold the inner races of the ball bearings 36 in assembled relation upon the sleeve.

The belt 44 is driven by a pulley 48 (Figs. 1 and 3) which is fixed to-the input shaft 50 of a reduction gear unit 52 to which power may be supplied by any suitable means such as a belt arranged to run upon a pulley 54' fixed to the shaft 5%. The unit 52 has an output shaft 58 on the inner end of which is fixed a pulley 58. This pulley drives a belt 60 which runs over another pulley 62 carried by a shaft 64, the abovementioned feed roll being fixed to the other end of the shaft. This shaft is rotatably mounted in bearings 66, '68 (Fig. 1) which project downwardly from a frame 10- upon which all the work engaging members, except the knife, are mounted. As will be described below, provision is made for adjusting the position of the frame in various ways so that any desired relation of the work to the knife may be obtained without upsetting the adjustment of the other work engaging members relatively to each other.-

The feed disk 26 is fixed to the lower end of a stem lzrwhich is mounted to rotate and slide axially within bearings 14 formed in a bracketwhich is adjustable axiallyof the feed roll is in order that the feed disk may be positioned properly with regard to the hub 42. For this purpose, a slide '68 on the bracket 76 is arranged to fit within a recess formed in the back of the frame it and is held in adjusted position by a screw as which extends through an elongatedslot 82 in the frame and is threaded into the slide.

The feed disk 26' is driven from the shaft 64 by connections comprising gearing as which operates a shaft tb mounted torotate in avertical position at the right hand side of the frame i0. Gearing 88 connects the shaft 86 with anothershaft 96 which is mounted to rotate freely in a horizontal position in the upper part of the frame iii. A shaft 92, mounted to rotate in a bearing 24 on the bracket i6, is alined with the shaft 98 and is connected thereto by a friction clutch comprising a socket 96, fixed to the shaft 92, and a complemental driving element 93 which is splined to the shaft 520. The driving force which this friction clutch is capable of transmitting can be adjusted by changingthe position'of a collar I along the shaft 90, thereby to vary the compression in a spring [82 disposed between the collar and the driving-element 98, and arranged to hold the latter'element against the socket 96. A beveled pinion I'M fixed to the shaft 92 meshes with a similar pinion I06 having a hub which fits within the bearing M, the lower end of the hub having fixed thereto a collar I08. A spring H-(l, coiled around the stem 12 and fixed to the collar M18, is also fixed to another collar H2 which may be secured in'any desired position of adjustment axially of the stem I2, in order to vary the compression of the spring III).

This adjustment of the collar H2 is employed to vary the pressure with which the feed disk 26 holds the work against the feed roll I0, and hence the feeding force provided by these members. It will further be evident that the feed disk is resiliently driven in rotation through the spring III], and that the above-mentioned frictional clutch will slip in response to any resistance to turning of the feed disk in excess of that for which the spring IE2 and collar I00 are adjusted. Thus, any tendency of the work to become jammed between the feed roll, and the presser foot 22 or the edge gage I8, on account of the feeding action is avoided.

The above-mentioned adjustments of the frame It by which the skiving cut may be varied will now be described in detail. In order to vary the taper of the feather 28, the frame I0 (and hence the feed roll Id) is mounted for angular adjustment about the high point of the rim I4 at its inner edge. For this purpose the rear side of the frame has an arcuate groove II4 within which fits a similarly shaped rib IIB projecting from a slide I28. The frame is secured to the slide by a pair of screws I20 which pass through arcuate slots in the frame and are threaded into the slide.

In order to adjust the feed roll vertically toward and away from the knife, and therefore to control the thickness of the feather 28, the slide H8 is mounted in a dove-tailed slideway formed in the upright portion I22 of an angular bracket having a base I24. An adjusting screw I25, threaded in the slide I I8 and bearing at its lower end against the base I24, can be turned to adjust the slide H3 vertically.

Adjustment of the feed roll I0 horizontally toward and away from the knife is effected by moving the base I24 along a slideway I28 formed in the base 42, this latter adjustment being under the control of a knob I 30 which is fixed to a screw I32 arranged to rotate without axial movement in the base 42, and threaded into a nut which is carried by the base I24. The base I24 may be fixed in any desired position of adjustment by a clamp screw I34 which passes through an elongated slot I38 in the base I24 and is threaded into the base 42. Any desired combination of the above-mentioned horizontal and vertical adjustments for the feed roll III may be employed to secure the required taper and thickness of the feather 28, as well as the necessary clearance between the knife and the work.

Although all the above adjustments are small in the ordinary use of the machine, and are not likely to disturb the driving relation between the belt Ed and the pulleys 62 and 58, proper tension of the belt can be maintained by adjusting vertically an idler pulley I38 (Fig. 3) which is carried by a bracket I40 adapted to be secured in various positions of adjustment upon the upright if? by a screw I42.

Various structural features of the illustrated feed roll It, presser foot 22 and edge gage I8 contribute materially to the capacity of the machine to produce the extremely short and thin feather 28, as well as to form the abrupt shoulder at, near the edge of the work, which is to be covered by the feather during the subsequent folding operation. These features of the machine will now be described in detail with reference to Figs. 4 and 5. v i

The rim M of the feed roll is extremely narrow,

its width being approximately equal to, but no greater than the thickness of the work to be skived. The flared portion I6 is contiguous to the rim, is frusto-conical in the illustrated machine, and of appreciable width, 1. e. a multiple of the width of the rim. The diameter of the flared portion gradually diminishes toward the hub I2 which is contiguous to the smaller base of the portion I6.

In order that the work may be bent abruptly over the ridge at the junction of the portion I6 and the rim I4 it is essential that the work be held securely against the feed roll at, and at each side of, the above-mentioned ridge. This result is achieved in the illustrated machine by the presser foot 22 which has a work-engaging surface substantially complementary to the sectional form of the portion I6 and rim I4 of the feed roll. That is, its surface has the form of an inverted V, one of its angular sides 22a being adapted to hold a narrow margin of work against the rim I4, and its other side 22?) being arranged to hold the work, inwardly from the aforesaid narrow margin, against the flared portion IE5 throughout the width of it.

It will be observed with reference to Fig. 6 that the skiving cut extends through the flesh side of the work considerably inside of a point opposite to the base of the feather 28. It is therefore desirable that a width of material, considerably greater than the width of the rim I4 be held straight and in engagement with the flared portion I6 when the skiving cut is made. For this reason the width of the flared portion I6, and also the width of the side 22b of the presser foot has been made several times greater than the width of the rim I4. Such extensive bearing of the presser foot and roll upon the body of the work also insures that a sharp or abrupt angular bend will be formed in the work at the point where the skiving cut is made. This condition in the work is necessary, whether the knife is of disk or tubular form, to provide the relatively rigid and abrupt shoulder 30 which is desirable for the purpose of insuring uniformity and accuracy in the folding operation, as well as of avoiding the waste caused by the usual much greater folding allowance. However, the circular cut made by the tubular knife 24 minimizes the width of the skiving cut to the greatest possible extent.

The edge gage I8 is mounted opposite and adjacent to the inner end of the feed roll I0, rather than in overlapping relation thereto, in order that there will be no gap between them in which the edge of the work can become jammed. The gage is provided with a throat I44 (Fig. 5) which confines the edge of the work more and more as it is guided into the bite between the presser foot 22 and feed roll, where a shoulder I46 on the gage positions the edge of the work flush with the outer edge of the rim I4. This shoulder rises from a point, as high above the rim I 4 as the work is thick, in an arcuate direction, as at I48, which is concentric with the pivot 20 about which the presser foot yields. Accordingly, there is no gap between the edge gage and presser foot in spite of such slight movement of the presser foot as may be caused by variations in the thickness of the work. Extending forwardly from the edge gage, and flush with the periphery of the rim I4, is a projection or table I50 upon which the margin of the work may flatly rest as it is drawn into the throat I44 of the gage.

The presser foot 22 is yieldingly urged toward ace-1,933:

the feed roll III-by a: spring I-52- (Fig. 4 which is? seated within a' reoessain the right hand end of the edge gage. The upper. end of this'springis engaged by a shoulder on a thumb screw L54- which is threaded in the right-hand end; ofathe presser foot 22. A- locknut. I 56,.threaded: on the: screw I54, is arrangedto-holditin' adjusted.- position. A screw I58 passing; through a: clearancehole in the presser foot and threaded into: the edge gage I8 is arranged adjustably to limit the movement of. the. pressenfoot. toward the feedroll, when thereisno work in: the machine; Provision for adjustment of the edge gage and'presser foot transversely of the axis of the feed roll I- is made by a slotted connection of the edgegage at I60 with apl'ate I62 to which the edge gage is'secured by a screw I64.

The mounting of the plate I62 is substantially the same as inmany patented machines of this type; the: platebeing adjustable at its lower end along a guide rib I66: which inturn is vertically and angularly adjustable upon another plate I68; this. plate being hinged at. I to a portion of the bearing 66. The guide rib. and plate I62 are secured in adjusted position-z onthe plate I68= by a-screw HI and arc-thumb nut I-I2threadedon thescrew. A knurledclampingnut. l'l3 threaded upona stud I'I4;. thebase of which is pivoted to the bearing 66;. holds the plate I6'8.-.in its opera,- tive: positions By unscrewingpthe'nut I13 it may be freed. tromtheplate I68, whereby the presser foot and edge gage-may be'swung away from the feed roll inorder to provide access'to-the-knifes The skivingchips are: discharged. into the in-; terior of the tubular-knife 24 and are expelled: therefrom as. will now be'deseribed. Supported. insidethe knife and independently thereof is a: waste tube I14 which extends through the. rear end. of the sleeve 32'intothe knifeand: terminates, adjacent to the-cutting edge of. the knife; This tube is. somewhat smaller than the openinggin. the knife but is.- fiaredat I15 near its forward? end soas to fit closely'within the knife;v In order to facilitate ther-movementiof.chipsinto thewaste tube its endslopesaupwardly away from the cut-- ting edgev of the knife; and is also beveled on'the:

inside. Furthermore. the; axis ofthe waste tube is: offset slightly fromv that of the knif'e so t'hatl the above-mentioned: flaring of the waste tube:

occurs only above-its axis where. it is. not likely which forms a. closure for" that portion ofthe:

opening of the knife 24 not. already covered-by. the presser foot and edge-gage;

In order. to provide access to the knife 24,- the.- cover is mounted to swingv away from the edgeof the knife upon the lower part of the bearing T4, and may; be clamped in either'an: inoperative position or-its operative position by aclamprsorew; I; An angular bracket lill (Fig. 2-). is arranged to hold. the cover against. thebearin'g 'M'andii's securedto'the'rear sideof the; framembyscrews I84.

The.- waste tube I M isaoarri'e'd by'a bracket186 the latter being fixed on a? rod l'88lwhi'ch is mounted for axial ad'justmentin an side I90 sothat.- the end of the tube I-I'A- can be positioned inthe desired; relati'onto-the'knife -edge. A liosel orpipe I92 (Fig; 7:1 is connected tothe'bracket I and is adapted to: carrychips, which are blown out of the waste'tu'b'e I1 1}: into ai'suit'able wastecontainer;

The slide.- t-(Figs; 2 and 3) serves as-a basetween. a pair ofspaced collars 208; 206 fixed on the screw 204 there extends an: arm 208' which projects forwardly-from the slide I 90; The slideway member 202 base; shank 2 I 0 which is'seated' upon the. upper end of the standard 40, and is I adapted. tobe clamped thereto by a screw 2'I2 which passes through: a. slot in the shank and is threaded into the standard. Adjustment of the shank2w; to vary the position of the abrasive wheel E23 laterally of. the knife, is effected by turning the knob. 200 which is ca'rried by a screw 2 I i-threaded in the-shank and mounted to rotate freely within a bracket. 2I-6: fixed to the standard40.

The use and operation of the machine will'now be biieflysummarized. A work-piece to be-skived is placed uponthe feed roll I0 with its leading end underneath the feed disc. 2%, and with its edge slightly overlappingzthe-rim I4 and .theedge of the table. I50adjacent' to the rim. As the work is fed into: the bite between the presser foot 22 and. the-feed. roll the edge of'the work is positioned flush with: theouter edge of the rim I4. Furthermore, the presser foot 22 causes-the work to .be: bent/into. conformity to: the sectional shape of thefeedrollwhereby an abrupt bend is impartedLtethe work close to. its edge, as described above with reference to'-Fig.. 6. Immediately upon leavingtheapresser foot the work is presentedi to the skiivin'g knife 24 in the above- -described bent..condition: There is then produced: at the. edge of thework a. very thin and short. feather Z8}.which,.whenit straight'ens after passing behind the. knife,v projects: abruptly from the shoulder 302 extending .fromzthe: base of the feather.aorosvthei-flesh. side ofthe work;

If, becauseof. variations in the thickness or texture of the stock,its feeding movement is retarded the movement: oflthe feed disc 26 will be slowed down: withithework; This action is-permitted by the: yielding: drive provided by the spring I'Ifi. Before the feeding aotionofith'e disc can: build up to the point: Whlfljail'lllllillg of the work between the feed'roll and presser foot could occur; slippage will occur between the. clutch elements 96:; 90"..

As each: chip leaves-the. work it passes into the oentizali opening; in: the knife and thence" into the tube I-l' so that therotation of the-knife is ineffectual to cause the chips to be matted or. held within the? knife by the effect-of centrifugal-force. The-constant blast'of. airiemittedzfrointhe nozzle I lfiexpiels thechips, .oncethey are'freed'from the workout oith'e rear end of the tube. I'M andintothe pipe I '92' whieh' delivers them intoa waste container.-

Having described my invention what-I" claim as new and d'esire toprotect by Letters-Patentof the United States is? l. In a skiving machine, the combination with" a skiving knife" of a' feed roll having at one end a narrow rim and a portion contiguous thereto which are angularly disposed to each other to form a ridge over which the margin of the work is abruptly bent, an edge gage for positioning the edge of the work flush with the exposed end of said rim, and a presser foot constructed and arranged to hold the work at and at each side of said ridge against said roll thereby to form an abrupt bend in the work adjacent to its edge at the point of operation of said knife.

2. In a skiving machine, with a skiving knife and a feed disc, the combination of av feed roll having a central flared portion, a hub at one side of said flared portion cooperating with said feed disc to feed the work, and a rim at the other side of said flared portion, said flared portion being wider than said rim, and a presser foot constructed and arranged to hold the work against both said iiared portion and said rim at each side of their junction.

3. In a skiving machine, with a skiving knife and feed disc, the combination of a feed roll having a narrow rim at one end, said roll also having a frusto conical surface extending from said rim with progressively diminishing diameter toward the midportion of the roll and a hub contiguous to the smaller base of said frusto-conical surface arranged to cooperate with said feed disc to feed the work, and a presser foot constructed and arranged to hold the work against said frusto-conical surface and rim immediately in front of said knife.

4. In a skiving machine, with a skiving knife and a feed disc, the combination of a feed r011 having a narrow rim at one side thereof, said roll also having a frusto-conical portion extending from said rim with diminishing diameter toward the other side of said roll, said frusto-conical portion being wider than said rim, and a hub contiguous to the smaller base of said frusto-conical portion arranged to cooperate with said feed disc to feed the work, and a presser foot constructed and arranged to hold the work against said rim and frusto-conical portion immediately in front of said knife.

5. In a skiving machine, with a skiving knife and a feed disc, the combination of a feed roll having a narrow rim at one end thereof contiguous to a frusto-conical portion extending with diminishing diameter toward the other end thereor, said roll also having a hub arranged to cooperate with said feed disc to feed the work, a presser foot shaped and arranged to hold the work against said surface and said rim at their junction and at each side thereof, and a gage for positioning th work with its edge flush with the outer edge of said rim.

6. In a skiving machine, with a skiving knife and a feed disc, the combination of a feed roll having at one side a hub cooperating with. said disc to feed the work and at the other side a narrow rim the width of which is approximately equal to the thickness of the work to be skived, an edge gage having a shoulder in juxtaposition to said rim, said gage also having a projection extending forwardly from said shoulder flush ith said rim, and a presser foot arranged to hold the work against both said rim and the portion of said feed roll contiguous to said rim.

7. In a skiving machine, with a skiving and a feed disc, the combination of a feed roll arranged to cooperate with said feed disc to a work piece toward said knife, said roll having a narrow rim at one end thereof, said rim and the portion of said roll contiguous thereto being angularly disposed to each other to form a ridge over which the margin of the work is bent, an edge gage having a shoulder facing and disposed in alinement with the exposed end of said rim, and a presser foot constructed and arranged to hold the work against said rim and the portion of said roll contiguous to said rim whereby abrupt bend is imparted to the work over said ridge at the point of operation of said knife.

8. In a skiving machine, with a skiving knife and a feed disc, the combination of a feed roll having a central flared portion, a rim at one side of said flared portion the width of which is approximately equal to the thickness of the work to be skived, and a presser foot having a work engaging face of inverted V-shape complemental in form to that of said rim and flared portion, said presser foot and roll being arranged to form an abru t bend in the work adjacent to its edge at the point of operation of said knife, and an edge gage for positioning the edge of the work flush with the exposed end of said rim.

9. In a skiving machine, in combination, a knife, a rotating feed roll, a rotary feed disc mounted for movement toward and away from said feed roll, a spring arranged to urge said feed disc toward said feed roll, one end of said spring being connected with said feed disc, and means for driving the other end of said spring in ro tation.

10. In a skiving machine, in combination, a knife, a rotating feed roll, a rotary feed disc, means for driving said feed disc comprising a frictional clutch constructed and arranged to slip in response to a predetermined resistance to turning of said disc, and a spring for urging said feed disc toward said feed roll, one end of said spring being operatively connected with said clutch and the other end being connected with said feed disc whereby said feed disc is yieldingly driven in rotation.

11. In a skiving machine, in combination, a knife, a rotating feed roll, a rotary feed disc hav ing a stem mounted to rotate and slide axially thereof, means for driving said feed disc comprising a rotating member which freely receives said stem, a collar mounted upon said stern for adjustrnent toward and away from said member, and a spring the ends of which are connected to said collar and member whereby said disc is both urged toward said feed roll and is yieldingly driven in rotation.

12. In a skiving machine in combination, a ro tary tubular knife having a cutting edge formed upon one end thereof, means for forming an abrupt bend in the margin of a work piece and for progressively presenting the bent margin of the work piece to said knife, said means comprising a feed roll and a presser foot, said roll having a narrow rim and a portion contiguous thereto which are angularl disposed to each other to form a ridge over which the margin of the work is abruptly bent, said presser foot being constructed and arranged to hold the work against said rim and said contiguous portion of the roll and at each side of their junction, a rotataole disk cooperating with said roll to feed the work toward said knife, and means for yieldingly driving said disk in rotation.

13. In a skiving machine in combination, a feed roll having a narrow rim and a hub at the opposite ends thereof, said rim and hub being connected by a frusto-conical section extending with diminishing diameter from said rim to said hub, a presser foot shaped and arranged to hold the MILTON I-I. ROSKE.

References Cited in the file 01' this patent UNITED STATES PATENTS Number Name Date Felix Aug. 12, 1913 Eppler May 22, 1917 Denne June 26, 1917 Eppler Sept. 25, 1934 McIntire May 7, 1940

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