US1103928A - Skiving-machine. - Google Patents

Description

A. BATES, A. E. JERRAM & J. GOULDBOURN.

SKIVING MACHINE.

APPLICATION FILED SEPT. 19, 1908.

Patented July 21, 1914.

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, A. BATES, A. EJERRAM 6L J. GOULDBOURN.

SKIVING MACHINE.

APPLIOATION FILED SEPT. 19. 190s.

1,103,928. Patented July 21, 1914.

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A. BATES, A. E. JERRAM & J. GOULDBOURN. SKIVING MACHINE.

APPLIOATION FILED SEPT. 19, 190s.

1,103,928. Patented July 21, 1914.

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A. BATBSQA. E. JERRAM & LGOULDBOURN.

SKIYING MACHINE. APPLICATION FILED SEPT. 19, 190s.

" Patented July 21, 1914.

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UNITED STATES PATENT OFFICE.

ARTHUR BATES, ARTHUR ERNEST TERE-AM, AND JOSEPH GOULDBOURN, OF LEICESTER, ENGLAND, ASSIGNORS TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION' OF NEW JERSEY. i

SKIVINGr-MACHINE.

Specification of Letters Patent.

Patented July 21, 1914.

Application filed September 19, 1908. Serial No. 453,813.

T0 all whom t may concern Be it known that we, ARTI-run Barns, An- 'rHUn ERNEST JERRAM, and JOSEPH GoULnoUnN, subjects of the King of England, residing at Leicester, in the county of Leicester, England, have invented certain Tmprovements in Skiving-Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to certain improvements in machines for skiving leather or similar materials.

ln skiving machines as heretofore commonly constructed, one disadvantage has been found to result from locating the skiving knifeV and grinding devices, together with their operating mechanism, above the bed of the machine whereby the operators view of the material being skived, was obstructed. in such arrangements, moreover,

these parts were more or less exposed and were thereby liable to be injured, or to injure the operator. Another objection to some prior machines was due to the employment of disk-shaped knives which were necessarily rapidly reduced in size by the operation of grinding, and hence rendered unfit for service in a comparatively short time. common use employs a cylindrical knife, but the same is not only expensive, but is diiiicult to manufacture and keep in satisfactory working condition. A further disadvantage of this type of skiving machine arises from the fact that the usual feed roll used therewith must necessarily be located within the circumferencer of the knife, which renders it difficult to remove and replace the knife for repairs or for other purposes, and, moreover, unless the knife is unduly large it is difficult to pro-vide and properly support a feed roll of the desired shape and size within the limit of its dimensions. These and many other disadvantages in existing niachines are obviated by this invention as will more fully hereinafter appear.

One important feature of this invention consists in providing a dished or coneshaped knife which is preferably mounted upon the end of its shaft and with .its convexed portion or apex out vvard. This knife Another type of skiving machine in vin referred to.

maybe made ofthin metal, as for instance, of highly tempered steel, and we prefer to form the same by the stamping process whereby the usual dies, which contain a much greater mass of metal than the blank from which the knife is produced, come in intimate contact therewith and extract the heat with sufficient rapidity to temper it. This ohviates the necessity of subsequently subjecting the knife to the usual tempering operation.

Another feature of this invention of importance comprises the combination with a table or suitable work support having an aperture therein, of a dished or cone-shaped knife located below such table and arranged with a portion of its cutting edge projecting through the aperture and its remaining portion sloping downward from the level of i thetable, and so disposed in relation tothe surface thereof that the upper marginal portion of the knife is approximately in the plane of such surface with its cutting edge in position to oppose the work. By this arrangement the knife is out of the way,.and furthermore, the grinding instrumentalities and all of the operating mechanism for the knife and grinder may be located within the base of the machine and below the work support, so as to be protected from injury. Such a disposition of parts is furthermore `advantageous in that it minimizes all danger of injury to the person of the operator.

In accordance with one feature of this invention the grinding means which we employ are combined with the dished or cone-shaped knife in suoli a manner as to act upon both surfaces of the knife. Preferably, but not necessarily, these mea-ns act simultaneously atively moving the grinding means and the i knife to and from operative grinding position, together with means whereby these parts may be moved together, relatively to the feed roll of the machine. This enables the knife to be removed from such feed roll without necessitating a separate adjustment of the grinding means to move the same out of the path in which the knife travels during such adjustment. Preferably the knife is mounted to move upon an axis that is coincident with the center or axis from which the spherical surface of the knife is generated, so that when the knife is adjusted relatively to the roll, or equivalent feeding device, or when the circumference'of the knife is reduced from grinding or wear, the original angular relation of its edge to the work supporting table or surface, as well as to the feeding device, is maintained without appreciablechange. We regard this as a very important feature of the present invention.

Preferably the grinding means is also adjustably mounted for movements about an axisv coincident with that about vwhich the knifemoves, whereby, as the knife is reduced in size the inclination of the bevel or bevels thereon will remain substantially con- In the arrangement employing two stant. grinding disks to produce bevels upon opposite sides of the knife the disks may, for convenience, be mounted upon the saine spin-i dle which is angularly disposed relatively to the knife spindle; and where the knife is of dished or coned form the arrangement may be such that the disks are adjustable toward `or from thev knife about the point from roller, and suitably combined therewith is' another member, herein shown as a work presser, which acts as a gage, of improved construction, having capacity for one adjustment, relatively to the first-named member, to determine the length and inclination of the skive or bevel and capacity for an-l other adjustment relatively thereto to de-k termine the thickness of such skive or bevel.

Preferably the adjustment for determining ythe length and inclination of the bevel is effected by arranging a pivotal mounting `mined by the pivotal adjustment above referred to.

By combining'these two adjustments precisely the inclination and length l of bevel, as well as the thickness of the skiving desired, can be obtained in a very simple and eifective'manner, and the machine may also be adjusted to accommodate stock of varying thickness. `An important feature in this connection consists in mounting the work feeding and supporting member for pivotal movement near one en d, and in applying a yielding pressure device to thev said member in the vicinity of its pivot to oppose the pressure of the work-pressing member, which is preferably l pivotally mounted at or near the opposite or free end of the work feeding member. This arrangement serves to equalizethe pressure upon the stock as it is fed to the knife, with the result that all portions of the stock are aCL- vanced at an equal speed and the skiving operation is accomplishedin an even and regu- W lar manner. Other important features of the invention, including improved details of construction and combinations of partswill be hereinafter more particularly described and claimed.4v

In the accompanying drawings,-Figure j l is a front elevation of the machine, Vwith portions of the main frame broken' away to show internal parts. Fig-2 is an end elevat-ion, partly in section, of the machine shown in Fig. 1. Fig. 3 is a plan view drawn to a larger scale than that of Figs. 1 and 2, showing in detail the feed roll, knife and parts associated therewith. Fig. 4 is a section showing a detail ofthe mechanism for adjusting the knife and grinding devices. -Fig. 5 is a section of the feed roll and its'supporting means; and Fig. 6 is a perspective view of a detail constituting an element of the mechanism shown in Fig. 5.

Like characters of reference indicate like parts throughout the several views.

The machine comprises a rectangular lcasing or frame l adapted to be supported on a bench or the like, the casing lbeing provided with a lid 3 hinged at 5, in order that the interior parts of the machine may be inspected when desired. The main shaft 7 of the machine is journaled in the lower part of the casing 1V and it is rot-ated by a powerA driven pulley 9 loose upon the shaft but capable of being connected therewith by a clutch ll actuated ,from a treadle or other device which is connected to the bell crank heat with sufficient rapidity from the blank to effect the necessary tempering thereof. The knife thus formed need notbe lfinished upon its surfaces but merely requires a slight bevel to be ground upon both sides to form the cutting edge.

The knife 15 is herein shown as secured by a clamping plate Q upon the upper end of a spindle 27 contained in a sleeve 29 that projects from a casing 31 surrounding the' main shaft 7, the knife being driven from the main shaft by a bevel gear 33 thereon f which meshes with a similar gear 35 on the lower end of the spindle 27. The axis of the spindle 27 is shown as slightly inclined to a vertical plane, as will appear in Fig. 2, and its inclination can be varied by means of an adjusting device. The adjust` ing device, as herein shown, comprises a .the feed roll 21 at a plane lying between headed bolt 37 threaded into the main casing 1 and engaging a tail piece or extension 39 formed upon the casing 31. A spring 41 secured at one end to the main casing and at its other end to the extension 39 maintains the latter in contact with the bolt 37. The inclination of the spindle 27 may be so adjusted that the edge of the knife 15 projects just above the feed roll 21 and also a short distance beyond the inner side of a slot 43 formed in the lid 3, as shown in Fig. 3.

The grinding apparatus for the knife 15 comprises two disks 17 and 19 which are preferably both secured upon the upper end` of a spindle 45 journaled in a sleevev47 that projects fi'oin a casing 49 surrounding the main shaft 7. The grinding spindle 45 is driven from the main shaft 7 by bevel gears 52 and 53 as shown in Fig. `1, from which figure it will be seen also that t-lie two casings 31 and 49 are arranged side by side and are provided with a tongue and groove connection 55 so as to completely inclose the bevely gears which transmit motion from the main shaft 7 to the knife spindle Q7 and to the grinding spindle 45,

The disks 17 and 19 are arranged to act,V

respectively, upon the upper and lower surfaces of the marginal portion of the knife, and as shown in Fig. 2, their distance apart on the spindle 45 in conjunction with the angular relationship of the latter with the knife spindle 27 insures the formation of a proper ycutting edge upon ,the'periphery of the knife.

'The grinding apparatus is adapted to be moved into and from grinding position by any-suitable means, that selected for illus.- tration consisting of a headed bolt 51 (Fig. 4) which is threaded into a block 57 and bears upon a tail piece or extension 59 formed upon the casing 49. A spring 61 secured to the main casing 1 and also to the extension 59, tends to maintain the bolt 51 and tail piece in engagement. c f

1n order that both the grinding apparatus and the knife 15 may be moved together toward or from the feed roll 21, the block 57 4be seen that both the grinding apparatus 17,

19 and the knife 15 are yieldingly maintained in working position by the springs` 41 and 61. f f

The feed rollf21 is mountedl on a bearing 65 (Fig. 5) said bearing being movable about a pivot 67 the axis of which if eX- tended would intersect the circumference of that of the operative portion of the knife edge and the axis of the feed roll. The feed roll 21 is driven from the main shaft 7 by a bevel gear 39 on said shaft which meshes with a similar gear 69 on a vertical shaft 71 journaled in a sleeved extension of the main frame. The shaft 71 carries at its opposite 'end a worin gear 73 which meshes with a worm' gear 75 on a horizontal shaft 77 to which is connected a floating spindle 79, the latter being coupled to the feed roll. In the machine herein illustrated the feed roll 21 is so mounted as to be capable of yielding during the operation of the machine, as will be hereinafter described, and in order to permit of such yielding the fioating spindle 79 is connected with the feed roll 21 by a universal coupling, herein shown as comprising a ball'Sl on the end of the spindle 79 which is received in a recess 83 in the hub of t-lie feed roll, and a pin 85 rotatably mounted in the ball 81, and provided with flattened sides that ai'e received in slots 87 in the hub ofthe feedroll, as shown in Figs. 1, 5 and G. The opposite end of the floating spindle 79 is similarly connected with a slotted sleeve 39 fast upon the shaft 77.

l The pivot (37 of the bearing 65 of the feed ijcll 21 is mounted in a block 91 adjust-ably suppr'rrted on the main casing 1, and the connection between the pivot and the feed roll bearing comprises a slot'93 inthe latter as vra'.

Y 'shown by dotted lines in Figs. 1 and 5. A

spring 95 situated within a sleeve 97 threaded. into the main casing 1 acts through. a plunger 99 and a strut 101 upon the'bearing 65 so as to force the feed roll 21 toward the work presser 23. One end of the strut 101 isreceived within a recess 103 formed in the bearing 65, while the other end is seated in a depression 105 in the plunger 99, the latter having a fiange 107 that serves to limit its outward movement by engaging the end of the sleeve 97, as shown by dotted lines in Fig. 1. The force exerted by the spring 95 upon the bearing 65 can be adjusted either by means of a plug 109 threaded into the .end of the sleeve 97, or by screwing the sleeve itself upor down in the main casing 1. A lug 111 on the block 91 extends into a slot in the bearing `65 and prevents it from being displaced laterally while permitting it to rise and fall. t

l, The work guide or presser 23 is herein shown as pivotally mounted upon a plate 113 that is provided with a stem 115 received within two perforated bosses 117,

, 119 on the main easing 1. The stem 115 is screw threaded and a nut 121 thereon andv situated in the space between the two bosses 117, 119, provides means whereby the presser 23 may be raised or lowered to vary thethickness of the skive and to accommodate work of varying thicknesses. A dowel pin 123 shown by dotted lines in Fig. 1, serves toprevent rotation of the plate 113. The work presser can be moved vabout its pivot 125 to vary-the angle it makes with the edge of the knife so as to obtain the desired angle or width of the bevel on the materialv between it and the feed roll 21, by means of the handle 127 that projects from a spindle 129 journaled in the plate 113, and pro-v vided with an eccentrically mountedV pin 131 to engage a slot 133 in an 'arm extending 4from the presser 23, as shown in Figs. 1 and 3. A washer or other suitable device may be inserted beneath the boss of the handle 127 in order that it may be retained in any of its positions of adjustment through the frictional engagement thereof with the boss and that portion of the main casing adjacent thereto. Y

, It will be understood, thatduring the operation of the machine the work passes between the feed roll 21 and the work presser 23, the spring 95 causing the work tor be' gripped yieldin'gly between these two members so that it is fed by the roll 21 against the edge of the rotating knife 15 with cer-iV tainty and precision.l It will also be seeny from an inspection of Figs. 1 and 5 that the thrust of the spring 95 is received at a point on the bearing nearer to the edge a of the feed roll than to the edge I) thereof. This arrangement has the effect of producing,l a light pressure upon the work immediately,

-below the edge b of the feed roll, and a heavier pressure thereon below the edge Va. It will furthermore be seen that by yieldingly mounting the work feedingl roll for pivotal movement near one end in the manner shown to oppose the pressure of the work pressing member, which is pivotally mounted at its opposite end, the pressureof the latter .upon the stock as it is fed to the knife is equalizedk so that all portions of the stock may be advanced to the knife by the feed roll at an equal speed, and the skiving operation thereby accomplished in an even and regular manner. t Y

In a machine constructed as above described, and as shown inthe drawings hereof, the knife, grinding mechanism and all of the operative parts are located below the work feeding table and may be thereby inclosed in a suitable easing to guard against injury to the mechanism, as well as to refi duce to a minimum the liability of the hands of the operator coming in contact with any of said parts. y

v yIn operation, if the knife 15 requires a cutting edge formed upon it, or. if the cutting edge requires resharpening, upon adepression of the treadle the main shaft 7 is clutched to the driving `pulley 9, and the disks 17 and 19 of the grinding apparatus are brought into contact with the knife by rotation of the bolt 51. When the knife has been suliiciently ground thegrinding devices are moved from engagement with it, andthe knife is then adjusted by the bolt 37 into lthe position shown in Figs. 2 and 3, with its edge extending through the opening-or slot L13 in the lid 3 and overlapping the feed roll 21. The work presser 23 is then adjusted at the desired inclination and altitude with relation to the knife by the handle 127 and the nut 121, and the requisite upward pressure is exerted upon the feed roll 21 by adjustment of the sleeve 97, in the main casing'l. These adjustments havingbeen made, the operator presents the marginal portion of the work to be skived between the feed roll 21 and the presser 23, and the work is fed against the edge of the rotating` knife. After passing over the slot -1-3 the work travels along` the surface of the lid 3 which forms the work support.

Having thus described our invention, what we claim as new and desire to secure byLetters Patent in the United States is:

' 1. In a` skiving machine, the combination with a work supportingrtable having an f with a work supporting table having an aperture therein, of a rotary dished knife the edge of which is arranged to make a. cut extending at an angle to the axis of rotation arranged below said table with a portion of its cutting edge in said aperture and its remaining portion inclined downwardly therefrom.

3. In a skiving machine, the combination with a work supporting table having an 4 aperture therein, of a rotary dished knife,

the axis` of rotation of which is oblique to the plane of the table and the edge of which is adapted to make a cut extending at an angle to said axis, said knife being located below said table with a portion of its edge in said aperture, and driving mechanism for said knife also located below said table.

el. In a skiving machine the combination with a work supporting table having an aperture therein, of a rotary dished knife the edge of which is arranged to make a cut extending at an angle to the axis of rotation having a portion of its edge extending in said aperture, grinding devices for the knife, and operating mechanism for said parts, the remaining portion of said knife, and said grinding devices and operating mechanism being located below the level of the table. y

5. In a. skiving machine, the combination with a work supporting table having an aperture therein, of a rotary dished knife the edge of which is arranged to make a cut extending at an angle to the axis of rotation having a portion of its edge extending in said aperture, a feed roll and operating mechanism for the knife and roll, all of said parts being located below the level of the table.

G. In a machine of the class described, the

combination of a. work supporting table provided with an aperture constructed to receive a portion only of the edge of a knife, and a skiving knife mounted for movement toward and from said aperture.

aperture in passing yfrom operative to inoperative position.

9. In a. skiving machine, the combina-tion with a work supporting table provided withl an aperture, and a feed roll located below said aperture, of a knife below the table and arranged for movement toward and from said aperture and feed roll.

l0. In a. skiving machine, the combination with a dished knife, of a. supporting spindle therefor mounted for pivotal movement about an .axis located at the end ofsaid spindle to permit the knife to move to and from operative position.

11. In a skiving machine, the combina-tion with a dished knife, of a supporting spindle therefor l adjustably mounted for pivotal movement about an axis located at the end of said spindle to permit the knife to move to and from operative position, and means for rotating said spindle, said means being operative in any of its positions of adjustment.

with a table, of .a skiving knife and work feeding means arranged for relative move- .ment to bring the edge of the skiving knife intofor out of operative relation with the `work feeding means and the work-support- .ing surface of said table.

13. In a skiving machine, the combination ywith a tab-le, of a feed roll and a knife, said parts being arranged for relative movement whereby the knife is caused to be brought ,into or out of operative relation with the yfeed roll, said knife in the last-named posi- `tion being located entirely below the table.

14. In a skiving machine, the combination ingto that from which the spherical surface of the knife is generated.

15. In a skiving machine, the combination with a dished knife, of a rotatable spindle therefor mounted for movement about an .axis corresponding to the center fromwhich the `spherical surface of the knife is generated, and driving means which is operative to rotate said spindle in its several positions of adjustment about said axis.

16. In a skiving machine, the combination `with a. work supporting table provided with` an aperture, of a dished knife, a supporting spindle therefor mounted for pivotal move- `ment beneath said table and arranged to permit the knife to move into and out of `operative relation to said aperture, and driving means for said spindle.

y 17. In a skiving machine, the combination with a rotary knife having a supportl2. In a. skiving machine, the combination `with a knife having the approximate form vof a segment of a sphere, of supporting means therefor arranged to permit move- A'ment of the knife about a center'correspond- 18. In a skivingmachine, the combination with a rotary dished knife having a supporting spindle, of grinding disks arranged on opposite sides of said knife and adapted to simultaneously grind two convergent bevels thereon, a spindle for supporting said disks', and a shaft having driving connection with said spindles and about which they are relatively adjustable.

19. In a skiving machine the combination with a circular knife angularly adjustable idle,`of a grinding device having a supporting spindle, said spindles mounted for relative pivotal movement about an axis which intersects said spindles.

`22. In a skiving machine, the combination with a knife having a supporting spindle, of a grinding device having a supporting spindle, said spindles being mounted for relative pivotall adjustment about an `axis -which intersects said spindles, and driving means for the Vspindles operative in any of their positions of adjustment.

23. In a skiving machine, the combination with a knife having a supporting spindle, of a grinding" device having a supporting spindie, a driving shaft for. the spindles, and means whereby the spindles are mounted for adjustment about said shaft.

24. In a skiving machine, the combination with a knife having a supporting spin- H'dle, and a grinding device having a supporting spindle, each of said spindles provided with a gear, of adriving shaft having coperating gearing, and casings movably mounted upon the driving shaft and having sleeves surrounding said spindles.

25. In a skiving machine the combination with a work support of a rotary knife and a grinding disk, means for producing relative movement of said knife and disk to bring said members into contact, and. means for moving said members simultaneously about a common axis toward and from said work support, said common axis intersectingthe axes of said knife and disk.

2G. In a skiving machine the combination with inclined shafts of a knife and grinding device mounted respectively on the upper ends thereof and supported for adthereon.v

30. In a .skiving machine, the combina-1 i justment relatively to each other, of means for simultaneously adjusting the knife and grinding device, and independent means for adjusting said grinding device.

27. In a skiving machine, the combination with work feeding means, of a knife and a grinding device, inovablesupports therefor, controllable devices arranged to act upon said Vsupports to movey the knife and grinding device in 'unison away from the work feeding means, or to movev the grinding device alone away from said means,

and yielding mean'sfor movinfv said supports toward said means.

28. In a skiving machine, the combination with work feeding means, of a knife and a grinding device, movable supports therefor provided `with extensions, a ooltr for engaging the knife support extension having threaded engagement with the frame of the machine and provided with a collar,

a block surrounding Vsaid bolt below the collar and provided with an internally threaded arm, a bolt fitting said thread and engaging the extensionlunon the grinding device support, .and yielding means for moving said supports toward the work feed'- ing means.

29. In a skiving machine, the combination with a rotaryknife, yof a pair of grinding disks mounted upon a. common support, and means for moving said disks into simultaneous contact with 'the opposite sides of the knife to grind two convergent bevels tion with a knife and a supporting spindle therefor, of a pair of grinding disks arranged upon opposite sides of the'lknife and having a supporting spindle, said spindles arranged for movement about an axis, which intersects their longitudinal axes.

3l. In a skiving machine, the combination with a knife having a supporting spindle, of a pair of grinding disks arranged upon opposite sides of the. knife and havinga fsupporting spindle, said spindles arranged for adjustment-s about an axis which intersect-s their longitudinal axes, and means for effecting such adjustments.

32. In a skiving machine, the combination with a knife having a supporting spindle, of a pair of grinding disks arranged upon opposite sides of the knife and having a supporting spindle, said spindles arranged for adjust-ment about an axis which intersects their longitudinal axes, and means for rotating the disks in any of their adjusted positions.

' 33. Work feeding mechanism for a skiving machine comprising a work support yieldalole vertically and angularly andv work pressing means arranged for adjustment relatively thereto to determine the length and inclination of a bevel and to determine the thickness thereof, said adjustments being effected independently.

34. llVork feeding mechanism for a skiving machine comprising a work supportyieldable vertically and angularly and work pressing means associated therewith arranged for p-ivotal adjustment to determine the length and inclination of a bevel and for independent bodily adjustment to determine the thickness thereof.

35. l/Vork feeding mechanism for a skiving machine comprising a bodily and angularly yieldable feed roll, a carrier adjustable relatively thereto, and a presser pivoted to said carrier and angularlyadjustable with respect thereto.

36. Tork feeding mechanism for a skiving machine, comprising a bodily and angue larly movable feed roll, a carrier mounted for adjustment relatively thereto, a presser pivoted to said carrier and provided with an arm, and a lever supported upon the carrier and operatively connected with said arm.

37. In a skiving machine, the combination of a feed roll, pivotal means for supporting saidy roll near one end, yielding means for holding' the roll in enga-gement with the work, and means for adjusting the pressure of said yielding means.

38. In a skiving machine, the combination with a feed roll, of a yielding support therefor, the parts being so arranged that one end of the roll will yield more readily than the other, and means for adjusting the effective pressure of said support against the work Without varying the position of the support.

39. In a skiving machine, the combination with a feed roll and a bearing therefor constructed to have pivotal engagement with a fixed part of the machine, of yielding means to effect such engagement.

40. In a skiving machine, the combina-- tion with a feed roll, of a pivotal support located near one end of the roll, and yielding means located near said support and acting to maintain the roll in engagement therewith.

4l. In a skiving machine, the combination with a feed roll supported for pivotal movement near one end, of yielding means acting to exert an upward pressure upon the roll in the vicinity of its pivotal support and adjustable devices to vary such pressure. i

42. In a skiving machine, the combination with a feed roll, of a bearing therefor having a pivotal connection with the machine frame near one end of the roll, a strut engaging the bearing near said connection, a spring-pressed plunger acting upon said strut, means for limiting the movement of said plunger, and a sleeve secured to the frame for housing the plunger and its spring.

48. In a skiving machine, the combination with a feed roll supported for yielding movement near one 'end,vof a work presser associated therewith and supported for pivotal adjustment near the opposite end of the feed roll.- j

44. In a skiving machine, the combination with a knife, of a feed roll having a bearing mounted for adjustment about a pivotal axis within the circumference of the roll the extension of which axis intersects the periphery of the feed roll in a plane located between the cutting edge of the knife and the axis of said roll.

45. In a skiving machine, the combination with a feed roll and a bearing therefor pivoted to the frame of the machine on an axis located near the end of the roll and lying in' a transverse plane between the surface of the roll and its axis, of a work presser supported for pivotal movement near the opposite end of the feed roll.

46. In a skiving machine, ythe combination with a feed roll having a pivotal support near one end, of yielding means acting upon l 'the roll arranged near said support, and a `work presser associated with the roll and pivotally supported near its opposite end.

47. In a skiving machine, the combination with a feed roll pivotally supported near one end, of adjustable yielding means to act upon the roll arranged near said support, and a work presser associated with the roll anl pivotally supported near its opposite en 48. In a skiving mach-ine, the combination with a feed roll, a bearing therefor, and means whereby said bearing is supported for pivotal movement to a fixed part of the machine, yielding means acting upon the bearing to sustain the roll against the pressure of the work, and means for preventing lateral displacement of the bearing.

49. In a skiving machine, the combination with a casing and a lid hinged thereto, said lid having a slot therein, of a dished skiving knife and its operating mechanism inclosed within the casing, said knife being arranged below said lid and supported for movement to project a portion of its edge through said slot, or to be withdrawn therefrom.

50. In a skiving machine, the combination with a work supporting table having an aperture therein, of a dished knife arranged with a portion of its cutting edge in said aperture and its remaining portion entirely below said table and inclining downwardly from the surface thereof, said knife being movable toward and from said aperture.

5l. In a skiving machine, the combination with a knife having a supporting spindle, of a grinding device having a supporting spindle, said spindles being mounted lfor pivotal movement about an aXis located at- 53. In a skiving machine, the combination of a feed roll having a sleeved extension, a stem upon which said extension is rotatably supported, said stem havinga head pivotally supported to the frame near Vone end of the roll and provided with a recess iii the vicinity of its support, and a spring-actuated plunger provided with a stein seated in said recess. I

54:: In a skiving` machine the combination with a work supporting table having an aperture therein of an inclined rotary shaft located below said table, and av dished knife carried on the upper portion of said shaft, said" knife having a portion of its cutting edge extending' into said aperture.

. 55. In a skiving machine the combination with a work supportingtable over which thework is fed of a dished'knife having a portion of its edge Yin Vposition to nieettlie oli-coming work, all of the remaining portion of theI knife sloping downward below the table. f

'56. In a skiving machine the combination with a `work support-ing.; table having an aperture therein of a 4knife having the approximate fo-rin of "a segment of a hollow sphere arranged below said table with a portion of its edge in said aperture.l

v57. In askivingv machine the combination with a dished knife having its convexitv uppermost of a feed roll Vlocated below said 40 knife and arrano'ed' to yield, a work presser Y kand means for adJusti'ng the angular position of said presser.

In testimonywhereof we have signed our `names to this speeiiication in the presence of l two subscribingwitnesses.

Copies oi this patent may be obtained for five cents each, by addressing the Commissioner of Iatents,

Washington, D. C. v

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