US1035228A - Skiving-machine. - Google Patents

Description

W. A. PARMENTER L A. B. ALBEN.

SKIVING MACHINE.

APPLICATION FILED owls, 1910.

Patented Aug. 13, 1912.

2 SHEETS-SHEET 1.

`W. A. PARMENTER & A. B. ALBEN.

SKIVING MACHINE.

APPLICATION FILED owls, 1910.

'wwf/@yf puniTnn sTATns PATENT onnicn WILLIAM A. PARMENTEB. AND .RTHUR B. ALBEN, O-F BRO'C'KTDN, MASSACHUSETTS,

ASSIGNORS OF 'SE'I'TS ONE-THIRD T0 CHARLES S. IPIEBCE,v QF BBOCKTON, MASSACHU- SEWING-MACHINE.

Specification of Letters Patent.

have invented a certain new and useful Improvement in Skiving-Machines, of which( the following -is a specification, reference being had therein to the accompanying drawings. g

Our present. invention relates to skiving machines of the type in which a cylindrical or ring knife is employed. Such a machine is shown and described in our prior Patent, No. QMAOB, dated December 21, 1909.

The machine embodying our invention is intended particularly for use on work having sharp curves which cannot be skived entirely satisfactorily on machines as heretofore constructed. It is also adapted partifcularly for use on thin unresisting material such as felt, paper kid and soft leather'.

In the use of machines =of't his type, as

heretofore constructed, the chief diliculty has arisen from `the tendency of the knife to cut a wavy scarf or even to nick the scarf or to clip off the last corner. This tendency has not been so apparent when the machine has been used on straight work or upon stiff or resisting material, but when it has been attempted to employ the machine to skive soft material or upon work having sharp curves or angles, this tendency of the machine ias been so great as to causeserious loss and to make it uneconomical to use the machine for this class of work. The machine embodying our present invention is, however, so constructed that it is possible to skive satisfactorily very sharp curves and angles, and even both sides and the end' of a slit; and also to skive very unresis'ting material, such as felt and the like.-

The present invention also includes lmore means for .adjusting the feeding instrumentalities relativelyto each other.

The invention will be fully understood from the following description taken in vconnection with .the accompanying drawings, and the novel features are pointed out and clearly defined in the vclaims at the close of the specification.

In the drawings,-Figure l is a plan view of a machine embodying our present .invention. Fig. 2 is an end elevation ofthe manal section of .the feed wheel. Fig. l1.- isfav view in perspective showing the relation ofk which supports the 'ro-'1 to the :edge of the cylinf the adjustab tating feed guide, dr'ical knife. Fig. 5 is a detail of the rsame parts, being Aa section taken on line =5-5,

Referring now to the drawings-the table or frame of the machine is shown at A in e arm,

t B is shown the cylindrical knife 'which is secured to the shaft C and rotates therewith. The said shaft 'C is adjustable longitudinally by means of the nut D and collar E so that the-edge ofthe knife B may be moved forward or backward to'eXaetly the rig t point `with relation to 'the feeding mechanism. The said feeding mechanism consists of a knurled feed wheel G located interiorly Iof the knife and a rotating feed guide H located above the feed Wheel G and coperating therewith. The knurled feed wheel G is of peculiar shape, being vof very much smaller diameter at `one lend than at the other and having a contour,` such that when revolved it presents its surface at a distance from the edge Vof the knife which distance is substantially equal at all poi-nts between the knife and the feed wheel. In other words, if a section be taken through the feed wheel on the plane in which the edge of the knife lies the contour of the feed Fig. 1. f

Patented Aug. 13.1912. A y Application filed October 18, 1910. Serial'No. .587,739. i

wheel in this section will correspond with A a portion of the edgeof the knife. The shape of the feed wheel is plainly seen from Figs. 2 and 3. The knurled feed wheel -Gr is 'positively rotated upon a shaft I by means of worm and gear L and M, the said worm being mounted on a shaft N having at its rear end a bel-t pulley O driven from a similar belt pulley P on the main shaft C. The mushroom shaped feed wheel G is secured vto a sleeve 50 by means of a projecttion or lug 51 engaging a slot 52 which is cut in the end of the sleeve 50. The said feed roll G is held in contact with the sleeve 50 by means of the screw 53 which engages the -end of the nonrotating shaft I -upon which the sleeve 50 rotates. I

wheel is at an angletojthe ver-tical plane in which the edge of the knife lies as will befseen in Figs. -landl.- As will plainly be later' explained, this has an important ef 110 fect on the work produced. The wheel may also be placed as shown at an angle to the horizoi'ital7 but we do not consider this essential but only convenient as it keeps the shaft out of the way of the operators hands. It will also be seen that the effective surface of the feed wheel is at one side of a vertical line passing through the axis of the cylindrical knife, the said side being that away from the main portion of the stock to be operated upon after4 the manner described in our patent of the United States No. 944,103, dated iecember 21, 1909, previously referred to.

Above the feed roll is located a rotating feed guide H supp'ortedin an adjustable arm 1S. The axis of rotation of the rotating feed guide l-l is somewhat inclined frointhey horizontal as shown in Fig. 2, and the conr n all parts.

cave surface of the said rotating feed guide corresponds withvthe convex surface of the feed wheel G so that the work is carried forward between the feed wheel and the feed guide with a substantially uniform pressure rihe adjustable arm 18 in which the rotating feed guide is supported i. rovided with a'depending abut-ment 19 :h is cut away on the side next the knife as s iown in Fig. i and is so constructed that it lies very close to the cutting edge of the knife. As previously stated, the knife is adjustable slightly on its longitudinal axis so that is possible for the operator to bring the edge of the knife very close to the abutment and yet not strike the abutment when the knife rotates. l

We find that the placing of the feed wheel 1G an angle as described herein results in improved work; We believe this to to the fact that the feed wheel tends y the work slightly away from the i ment 19 andr thus to counteract the tendency of the knife to crowd the work against lthe abutment 19. By giving the aXis of the feed wheel substantially the inclination. 4iowa in Figs. 1 and 2, the tendencyrof the f d wheel to carry the work away from the abutment is not sufficient to interfere with theproper guiding of the work/on'the t but servesto relieve materially re ofthe edge of the work against ent. As any pressure of the edge 'ir against the abutment tends to he edge of the work and to curl it up, ill be seen that the arrangement described assists the machine materially in producing a smooth scarf.

it is of importance that the feed Wheel G and rotating feed guide H be adjusted tol each other and to the edge of the knife with lvery great nicety as otherwise imperfect work is likely to be done. By this means, also, the thickness of the work at the scarf is determined. For this'purpose the shaft I is mounted on a rockshaft 21 carried in bearings in the frame of the machine. Another arm 22 depending therefrom engages a screw 23 passing through a sleeve 24 and having at its outer end a thumb nut 25. A spring 26 is interposed between the arm 22 and the frame of the machine. This spring 26 serves 'to hold the arm 22 away from the frame of the machine and consequently to hold the feed wheel G upward against the inside of the knife with a yielding pressure, but the head of the screw 23 prevents the feed wheel rising above a predetermined point which is adjustable by means of the thumb nut 25. By this construction the feed wheel .is'allowed to yield downwardly and thereby allow a bunch or thick spot in the shaving to pass through while at the same Vtime producing a scarf of uniform thickreadily be adjusted by the thumb screw 32.- This construction holds the feed guide'so' that it cannot yield upwardly .and is perfectly rigid so far as movement upwardly is concerned but at the same time makes it possible to adjust the position slightly. lt will of course be understood that the angle which the rotating feed guide makes with the horizontal determines the width of the scarf. This adjustment is effected as just described. The bracket 29 is adjustable vertically by means of the thumb screw 34 and this adjustment determines the thickness of j the scarf at the edge. Said thumb screw 34;

engages-a lug 36 on the frame of the machine. A Sprin 361 tends' to hold the said bracket up against the head of the thumb nut 34. The bracket 29 may also be tilted about the point 38 by means of thethumb screw 39. A spring 1-0 holds the bracket back against the end of the thumb screw 391 The' system of adjustment' of the bracket 29 which has just been described will be seen to be such thatthe rotating feed guide and arm 18 are incapable of movement above a point determined by the various adjustments but that the said rotating feed guide can' yield downwardly slightly. The adjustment of .the position of the arm 18 by means of .the

thumb nut 32 determines the Width of the scarf. The scarf being wider the more nearly parallel the contour of thefeed guide is to the contour of the feed roll. v

`What we claim is:

1. In amachine of the character described' the combination with a cylindrical knife, of a feed wheell interiorly disposed with rela-- tion thereto, the axis of said feed Wheel beingr inclined to the plane in which the edge of the knife lies.

of the knife lies whereby the rotation of the feed Wheel tends to counteract the tendency of the knife to crowd the Work against the 2. In a machine of the character described, l abutment of the feed guide.

the combination ofa Cylindrical knife, a In testimony Whereoi1 We affix our signafeecl Wheel interiorly disposed with relation tures, in presence of two Witnesses.

thereto, and a feed guide having an abut- VVLLIAM A. PARMENTER. ment adjacent the edge of the feed Wheel, ARTHUR B. ALBEN.

Suid cylindrical knife rotating toward said Vvlitnesses:

abutment, and smid feed Wheel having its GEORGE P. DIRE,

axis inclined to the plane in which the edge ALICE H. MORRISON.

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