US1840344A - Skiving machine - Google Patents

Description

12 1932. R'. B wooDcocK ET AL 1,840,344

SKIVING MACHINE Filed April 23, 1929 Patented Jan. 12, 1932 n UNITED STATES PATENT oEFlcE REGINALD BOYD WOODCOCK ANDTHOMASAUBREY KESTELL. OF LEICESTER, ENGLAND, YASSIGrNOIRS TOv UNITED SHOE MACHINERY: CORPORATION, 0F PATERSON, NEW

JERSEY, A CORPORATION OF NEW JERSEY sxrvme MACHINE Application filed April 23, 1929, Serial No. 357,515, and in Great Britain June 5, 1928.

rIhis invention relates to skiving machines and is herein illustrated as embodied in a machine of the type shown in Letters Patent No. 1,1()3 ,928 grantedl July 21, 1914 upon an application` led in the names of Arthur Bates, Arthur Ernest Jerram and Joseph Gouldbourn. i

In skiving machines of this type in which theskiving knife is fastened to one end of a rotary. shaft it is customary to use' as a clampingy member a screw, the stem of which passes through a hole in the knife and is threaded into the shaft. In the removal and replacement of knives of this kind, there isfconsiderable danger that the operator may cut his fingers. In orderto obviate this possibility as Well. as to enable the operator to hold the knife `firmly while the clamping screw or other fastening means is being tightened and-loosened, the knife, according to one feature of the invention,A is provided with means adaptedto be engaged by a hand tool. In @the illustratedmachine, in which the knife is fastened to the upper end of its shaft, there projects from theupper face of the knife aboss which is circular in outline and is undercut. y It may, therefore, be firmly .held between the two suitably shaped pivoted arms of a hand tool While the clamping screw is being'loosened, for example; and then, while still held by the hand tool, Vmay be removed from, the niachine.

Skiving machines of the type referred to above comprise a substantially fiat uninterrupted work table, a rotary knife having that portion of its cutting edgewhich is operative at any given instant projecting through a slot in the table, a feed roll located beneath the-operative portion of the edge of the knife and a work guide and presser which projects above the table and cooperates with the feed roll'. With such a machine it is possible to skive the continuous edge of an ornamented opening inthe work by threading the work upon the presser and swinging the work in a closed path.

Y In order to facilitate the skiving of the edges of small openings, which require. that the work bes'wung sharply duringk the skiving operation, there is provided, according to another feature of the invention, an improved work' presser mounting. In the illustrated machine this mounting comprises a member having a thin edge upon which the presser is supported and about which it may be adjusted angularly. By this construction the usual pivot ypin for the presser is dispensed with and more space provided close to the presser in which to swing the work.

the illustrated construction this carrier takes 7 the form of a slide which is mounted in a horizontal guideway in the frame of the machine, a stop screw being provided for ensuring that the slide,y after having been removed from the machine, may be replaced exactly in its original position so that the adjustment of the feed roll is not disturbed.

These and other features of the invention including certain details of construction and combinations of parts will be described as embodied in an illustrated machine and pointed out in the appended claims.

Referring now to the accompanying drawings,

Fig. 1 is a front elevation, partly in section of a machine in which the invention is embodied;

Fig. 2 is a plan view, partly in section, of part of thev machine;

Fig. 8 is a detail sectional view, on an en- 5f larged scale, Vshowing the mounting of the skiving knife upon its shaft;

Fig. 4 is a plan view of a tool for use when removing the knife; and

Fig. 5 is an elevation showing one half of the tool.

Before proceeding to describe what is new, a brief description of the old Construction will be given. The machine comprises a boX- likeframe having a substantially dat upper surface. The knife 7, which is mounted at the upper end of the driving shaft 9, is of dished or spherical shape, and its cutting olge projects through a slot in the top of the frame, the work beingheld against a feed roll l1 by a work presser 13, and thus advanced to the rotating knife. The feed roll 11 is driven through universal joints from a shaft 15 andis mounted for swinging movement about a pivot`17 carried by a vertically ad justable block 91. A spring supported strut 19 engages the feed roll and holds it normally in the angular position shown; and by turning the nurled, member 21, the normal anguv lar position of the roll may be varied. The

workis fed away from the observer as viewed in Fig. 1, with the margin of the work held down upon the feed roll -by the work presser 13,fsaid work presser having previously been adjusted to cause the leather to be skived at the desired angle. As thus far described the machine is or may be substantially the same as that of the patent referred to above, and no further description of the old construction will be given. Y

In the present machine Vthe skiving knife 7 has rigid with it a hub 23 which is clamped to the upper end of its shaft9 by a screw 25 threaded into the end of the shaft. The head of the screw has formed on its under or clamping face a spherical seating, surface which engages a concave surface on a washer 27 which clamps the hub of the knife to the Y upper end of the tapered knife shaft.v The spherical and concave faces ensure that the knife shall be clamped in proper position upon its shaft. Y Y v The hubof theknife 7 has formed in the centre of its upper facea circular boss 9.9, the outer wallloffwhich is undercut, to receive ka hand-tool (Figs. 4 and 5) which may be clampedto it to lhold the knife while the binding screw 25 is being removed or replaced and by means of which the knife may readily be removed and replaced without danger of the operator being injured.

The handtool comprises two arms 31, 33

Vpivotedy together at their right-hand ends about a pivot pin A locking pin 37, pivoted at 39 to the left-hand endrof the arm 31, is adapted to swing into a slotin the left-hand end of the arm 33, and is threaded to recieve a butterfly nut 41. The right-hand ends of the arms are enlarged; and, formed in each, is a recess semi-circular in outline and under cut, the recess in the arm 31 being shown at 43. j The two semi-circular .recesses in the arms are caused to embrace the boss 29 on the knife, after which thefpin 37 is swung into the slot in the left-hand 'end of the arm 33 and the butterfly nut 41 is sorewedup to cause the boss 29 to be firmly gripped. The hand tool has l'iXed in it afpin 45r which,.when the toolis clamped pn the knife, enters a hole in the frame of the machine to prevent the tool and knife from rotating as the binding screw 25 is turned.

As has been stated. above, one feature of the invention is aconstruction whereby the feed roll may be removed from and replaced in the machine without disturbing its adj ustment.V To this end the vertically adjustable block 91, which carries the pivot 17 and the strut 19 and its support are mounted upon a carrier 47 inthe form of a bracket whi-ch'has a horizontal tongue-and-groove connection 48 with the frame of the machine, such that the bracket maybe slid to the left, as viewed in Fig. 1 and removed from the machine if desired. r)The bracket is clamped to the frame of the machine by screw 49, the stem of the screw passing through a slot in the bracketl and beingy threaded into the frame of the machine. The bracket may be adjusted laterally of the machine by a screwv 53 threaded through an arm on the bracket 47 and enf-*aging a face on the machine frame. Afterremoval of the clamping screw 49 and disconnection of one of the universaljoints between the feed roll and its driving shaft 15,

' the bracket 47 with the feed roll and its'strut 19A and usting devices may be removed as a whole from the machine for thev purpose of cleaning or changing theroll or forany other 9b purpose and Vmay be replaced in exactlyV the same positionne before by rei-engaging the tongue andgroove 48 and sliding the bracket along until the positioningscrew 53 in the bracket engages the face Von the machine frame and then inserting and tightening the clampingscrew 49.Y

The work presser 13 is mounted to pivot on a thin, rounded edge 55 provided at the upper end of a bar 57 liXed or formed on a plate 59 whichhas a'y downwardly projecting stem 61 adjustably mounted in the frame as hereinafter described. The work presser 13 at its upper end in the vicinity lofthe knife is made as thin and small as possible so that, if the edge of an opening of smallv radius in a work piece vis to be skived, the work piece may be threaded over the work presser and turned about as desired without undue interference from the presser. The presser 13 at its upper end has fixed in it a small thin plate 63 which projects into a gash' in the said knife edge at the upper end of the bar 57 to prevent the presser from, moving in the direction offeed of the work on the thin edge 55 of the bar. The presser atits lower end has an extension which projects under an arcuate flange 65 formed on the Vbar 57 and concentric with the edge 55 at the upper end of the bar57, said extension having threaded may have on it an indicating mark arranged the carrier to prevent the nut from being accidentally rotated. The plate 61 has an eX- tension 5 which is guided between the surface of the carrier 69 and a block 77 fixed to the carrier to prevent angular movement of the plate 61. The carrier 69 is pivoted on a vertical pivot 7 9 at the right-hand side of the machine so that it may be swung outwardly away from its operative position and carry with it the work-presser 13 and its associated parts (all still in their adjusted positions on the carrier) so that the feed roll 11 and its parts may be removed as above described. The carrier 69 is locked in closed position in contact with the frame of the machine by a hook-bolt 81 mounted in the carrier and passv ing through a slot in the frame of the machine.

Although the invention has been set forth as embodied in a particular machine, it should be understood that the invention is not limited in the scope of its application to and described.

Having thus described the invention, what We claim as new and desire to secure by Letters Patent of the United States is: j

1. In a skiving machine,ya shaft, a knife, and means for detachably fastening the knife to the shaft, said knife having a boss adapted to be engaged by a hand tool to facilitate removalfand replacement of the knife.

2. In a skiving machine, a shaft, a knife, and means for detachably fastening the knife to the shaft, said knife having an undercut boss adapted to be engaged by a hand tool to facilitate removal and replacement of the knife.

3. In a skiving machine, a shaft, a knife, and means for detachably fastening the knife to the shaft, said knife having an undercut boss circular in outline adapted to be engaged by a. hand tool to facilitate removal and replacement of the knife.

4. A machine of the class described hav-- ing, in combination, a knife, a feed roll, a work presser, and a supporting member having a thin edge upon which the presser'rests and about which it may be angularly adjusted.

5. A machine of the class described having, in combination, a knife, a feed roll, a presser, a supporting member having a thin edge upon which the presser rests and about which it may be angularly adjusted, and

`means .for .holding it in adjusted position.

` 6. A machine of the class described having, in combination, a knife, a feed roll, a presser, and a supporting member having a thin edge upon `which the presser rests and about which it `may be angularly adjusted, the' member being provided with an arcuate flange the lcenterfof curvature of .which lies in the thin edge, and the presser being provided with means for engaging the flange to hold the presser in adjusted position.

7. A machineof the class described having, in combination, a knife, a feed roll, a work presser, a supporting member having a portion of vsmall area upon which the presser rests but with which it is unconnected, and means for holding the presser in position upon the supporting member.

8. A machine of the class described hav ing, in combination, a feed roll, a carrier for the' feed roll detachably mounted in the frame of the machine, and means on the carrier adapted to engage the frame of the machine to facilitate accurate replacement of the carrier after removal thereof.

9. A machine of the class described having, kin combination, a knife, a feed roll, mechanism for adjustingthe feed roll, a carrier upon which the feed roll and its adjusting mechanism vare mounted, and means for detachably mounting the carrier on the frame of the machine. the particular machine which has been shown 10.- A machine of the class described having, incombination, a knife, a feed roll, mechanism for adjusting the feed roll, a carrier f "upon which the feed roll and its adjusting mechanism are mounted, means for detach- `ablyfmounting the carrier on the frame of the machine, land means on the carrier adapted to engagethe frame of the machine to ensure accurate replacement of the carrier after removal thereof.

11. Amachine of the class described :having, in combination, a knife, a feed roll, a carrier upon which the feed roll is pivoted, a member mounted upon and movable with respect to the carrier for adjusting the roll about its pivot, and means for detachably mounting the carrier upon the frame of the machine.

12. A machine of the class described having, in combination, a knife, a feed roll, a carrier upon which the feed roll is pivoted, a member mounted upon and movable with respect to the carrier for adjusting the roll about its pivot, means for detachably mounting the carrier upon the frame of the machine, and means on the carrier adapted to engage the frame of the machine to ensure accurate replacement of the carrier after removal thereof.

13. A machine of the class described having, in combination, a dished knife, a rotary shaft at the upper end of which the knife is mounted, a feed roll located beneath the knife, aipivot for the roll, an adjustable block in which the pivot is mounted, an adjustable spring-pressed memberA for .supporting theY roll for yielding movement about the pivot,

and a carrier forethe block and the member, said carrier beingY slidablymounted inthe frame of the machine. 'f 'f ,Y

14. A machine of the class described having, in combination, a dished knife, arotary shaft at the upper end'of which the knife is `mounted, a feed roll located beneath,v the knife, a pivot for the roll, an adjustable block in ywhich the pivotis mounted, an. adjustable spring-pressed member for supporting the roll for yielding movement about they pivot,

and a carrier for the block and the member,

' said carrier being detachable and slidably Y et 'names to this specification.

mounted in the frame of the machine.-

15. A machine of the class described having, in combination, a knife, a feed roll, a work presser, a carrier upon which the work presser .is adjustably mounted, means for mounting the presser carrier for swinging Y movement away` from the knifeand roll, and

a feed roll carrier upon which the feed roll is adjustably mounted, said carrier being readily removable from and replaceable on the `frame of the machine. e

16.'In a skiving machine a rotary shaft, a knife, and a screw for fastening the knife to the shaft, said knife having means adapted to be engaged by a hand tool while maintaining the screw accessible, whereby'the -knife and its shaft may be held from rotation while the screw is turned. l

17. A machine of the class described having, in combination, a rotary knife, a feed k.roll .for advancing the work to theknife in a substantially horizontal plane, a work presser, and a carrier for the workl presser pivotally mounted about a vertical axis which lies outside said presser, and means located between the vertical aXis and-the presserfor clamping the carrier to the frame ofthe machine with the work presser in operative position.

In testimony whereof we have signed our REGINALD BoYD wooDcooK. THOMAS AUBREY KESTELL.

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