US1721050A - Skiving machine - Google Patents

Description

L'ZZLSG 'July 1.6, 1929.

A. R. RIDERTRM SKIVING MACHINE Filed Oct, l5, 1923 Patented July 16, 1929.

UNITED STATES `P l-i'lfEll'l' OFFICE.

ANDREW R. RIDDERSTROM, OF NAHANT, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 UNITED SHOE MACHINERY CGRPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SKIVING MACHINE.

Application filed October 13, 1923.

The present invention relates to skiving machines, and more particularly to machines such as are used in shoe factories to skive the margins of shoe uppers.

The chief object of theinvention is to provide an improved presser foot and gage. Other objects will appear from the following description, taken in connection with the accompanying drawings, and will be particularly pointed out in the appended claims, it

being undeistood that it is intended to set forthV in the claims all the novelty that the invention may possess.

With these objects inview, the invention consists of the machine hereinafter described, illustrated in the accompanying drawings, and defined in the appended claims.

In the accompanying drawings, Fig. 1 is a perspectiveview of the forward portion of a skiving machine, illustrating a preferred embodiment of the present invention; Figs. 2 and 3 are fragmentary side and rear elevations of the same; Fig. 4 is a front elevation of a modification; Fig. 5 is a front elevation of a portion of the machine shown in Fig. 4, with a part broken away; and Fig. 6 is a view corresponding to Fig. 2 of the modification shown in Fig. 4.

The preferred embodiment of the present invention is illustrated fin Figs. 1, 2 and 3 as applied to a machine that is more fully illustrated and described in a copending application, Serial No. 521,239, filed kDecember 9, 1921. yThe machine illustrated in the modification .of Figs. 4, 5 and 6 constitutes the subject matter of avcopending application, Serial No. 319,565, filed August 25, 1919,- of which the present application is a continuation in part. It is not necessary to describe either of these machinesin detail, inorder to obtain an understandingof the present invention,`as the invention is equally' applicable toother machines of well known type, but reference isniade to the above-named applications for a fuller description of such portions of the machines as it is considered to be unnecessary to illustrate and describe herein.

In skiving machines of the above-designated character, the shoe upper is usually advanced by a feed roll 95 and a feed disk 143 to a rotating skiving knife 185 that cuts a scarf in the margin of the material. e The Serial No. 668,346.

feed roll 95 is provided with a frusto-conical working face 127 and is shown mounted uponk a feed roll shaft 33 journaled in a sub-frame 36 that is housed in a base portionv21 of the frame of the machine. The feed disk is mounted at the lower end of a feed-disk shaft 137 that, together with the knife shaft 181, is

feed roll 95 and the feed disk 143, properly to guide the work and hold it in place. The gage limits the extent of the scarf, so that the margins of various uppers shall be skived uniformly, and. the presser foot presses the leather or other stock yieldingly against the feedroll 95. According to the present inL vention, the presser foot 131 yields both vertically and pivotally to accommodate itself to variations in the thickness of the leather, but in the illustrated, normal position, its work-engaging face is parallel to, or in contact with, the adjacent work-engaging face 127 of the feed roll 95.

The novel presser footofthe present invention is carried at the free, outer end of a leaf spring arm 125. rlhe said free outer end of the spring arm is resiliently movable vtowards and from the feed roll. The spring arm 125, and also the gage 132, are mounted upon a holder or block 119 that is adjustably secured to the sub-frame 86 in any desired manner, as by means of one or more set screws 118 that extend through one or more elongated openings 120 in the block 119 and are tapped in the sub-frame, to one side thereof. The holder or block shownin the modification of Figs. 4, 5 and 6 is T-sliaped, except for a very short portion at 122, where it is cut away to allow for freedom in adjusting gages of various shapes. The elongated openings 120 .iay provide either for horizontal adjustment, as shown in Fig. 1, or vertical adjustment, as illustrated in Fig. 4, or both. The spring arm 125 is adjustably secured to the block 119 in any convenient manner, as by means of one or more screws 123. Viewed from the side, as in Figs. 2 and 6, the spring arm 125 is seen at an incline, and is provided with two depending ears 128.

A feature of the present invention resides in having the presser foot 131 yieldingly mounted on the out-er end of the spring arm 125. According to the embodiment of the invention that is illustrated in Figs. 4 to 6, a lug 130 of the presser foot 131 is interina diately pivoted betwen the ears 128 at 129. The ears 128 serve as a guide for the presser foot during` its pivotal movement, to prevent tilting of the presser foot about an axis parallel to the axis of rotation of the feed roll and to keep the presser foot upright. Tivo coil springs 133 are provided, one acting on each side of the pivotal point 129, so as yieldingly to oppose movement of the presser foot in either direction from the illustrated, normal position, in which its Work-engaging face is parallel to, or in contact With, the adjacent Worlnengaging face 127 of the feed roll 95. Owing to this construction, the presser foot may be employed With feed rolls having, differently inclined Work faces 127, across which the presser foot may be adjusted so as to occupy any desired position thereon.

The presser foot is thus yieldinp'ly carried at the free end of the si'irinp; arm 125. and its oscillations, in either direction, are yieldingly opposed by the springs 133. The gage 132 rests against the working` face 127 of the feed roll 95, and is curved to conform to the same. In the preferred construction. the `rage 132 is removably secured to the block 119, as by a screw 84. In the modification of Figs. 4, 5 and 6, the gage 132 is integrally connected to the spring arm 125. The construct-ion permits positioning the gage and the presser foot close to the knife 185; and as the presser foot yields both vertically and pivotally, it automaticallyY adjusts itself to variations in the thickness of the stock. The scarf Will commence and terminate very close to the presser foot.

In the modifications of Fins. Ll, 5 and 6, the springs 133 are interposed between the presser foot 131 and the spring?Y arm 125, one on each side of the lug` 130. In the preferred embodiment of the invention, however, the springs 133 are mounted over screw-threaded rods 56 that extend loosely through openings 58 in a plate member 8O that is rigidly secured to the spring arm 125 so as, in effect, to become a part thereof, and that carries the ears 128. The springs are confined between the plate member and nuts 90. The rods 56 are threaded into the presser' foot 131 so as to move rigidly therewith. The pivotal point 129 of this preferred embodiment is constituted of a J -shaped recess, provided upon the presser foot 131, as shown in Fig. 3, and the lun' 130 is constituted of a Wedge-shaped pivotal projection provided upon the support and that pivots in the V-shaped recess. This construction endoivs the presser foot With a very firm holding;` action, yet renders it very sensitive, so as to yield readily, Where re quired. It would spoil the effect if the springarm 125 were too flexible. To reduce the flexibility, therefore, a spring 60 is coiled about a screw-threaded rod 62, that extends through the plate member 8() and the spring arm 125, and thatY is screw-threaded into the block 119. The coil spring 60 is maintained between the plate member 8O and a nut 92. The combined action of the springs 125 and 60 is to render the yielding action of the presser foot somewhat stiff. In order that the presser foot 131, so mounted, shall not press too heavily against the Work, a stop 94 that is mounted upon the spring arm 125 is adapted to engage the block 119, thereby to limit the movement of the presser foot 131 towards the feed roll 95. The stop is in the form of a set screw, rendering' it possible to y adjust the stop for Work of different thickof the invention, as defined in the appended claims.

What is claimed is:

1. In a machine of the character described, al feed roll, a revoluble knife, a block, a member a. portion of Which is rigidly fastened to the block, a presser foot freely svvivelled intermediate its ends to another portion of the member and adapted to cooperate With the feed roll and with the knife, and equalizing means acting' yieldingly upon the presser foot and tending to maintain the presser foot yieldingly in a predetermined position.

2.V In a machine of the character described, a revoluble knife, a feed roll, a presser foot cooperating with the knife and with the feed roll, means for mounting the presser foot in termediate its ends, springmeans actingr upon the presser foot upon both sides of its pivotal point, and adjustable yielding means sup port-ing` the presser foot.

3. In a machine of the character described, a revoluble knife, a feed roll, a block, a member a portion of which is rigidly'fastened to the block, a presser foot mounted upon another portion of the member to cooperate With the knife and with the feed roll, means for adjusting the said other portion of the member tovvards and from the feed roll, the presser foot being pivotally mounted upon the said other portion of the member intermediate of its ends, and equalizing means normally adapted to yieldingly maintain the presser foot in a position substantially parallel to the adjacent surface of the feed roll.

4. In a machine of the character described, an angularly turned spring provided with ears, a presser foot pivoted between the ears and equalizing means acting yieldingly upon the presser foot and tending to maintain the presser foot yieldingly in a predetermined position.

5. In a machine of the character described, a feed roll, an angularly turned spring eX- tending over the feed roll in a direction substantially parallel to the axis of the feed roll and provided with ears and a gage that eX- tends along a portion of the periphery7 of the roll and is curved to conform to the same, a presser foot pivoted between the ears, and springs between the angularly turned spring and the presser foot.

6. A skiving machine having, in comb-ina tion, a knife, a feed roll, an intermediately pivoted presser foot, and spring means acting upon the presser foot upon both sides of its pivotal point.

7. A skiving machine having, in combination, a. knife, a feed roll, a block, a leaf spring fastened to the block in such manner that its outer end is movable towards and from the roll, a presser foot intermediately pivoted to the outer end of the leaf spring, and spring means acting upon the presser foot upon both sides of its pivotal point.

8. A presser foot comprising a leaf spring, a presser foot intermediately pivoted to an end of the leaf spring, and spring means acting upon the presser foot upon both sides of the pivotal point.

9. A skiving machine having, in combination, a knife, a feed roll, a block, a leaf spring fastened to the block in such a manner that its outer end is movable toward and from the roll, a presser foot carried by the outer end of the leaf spring and movable relatively thereto, and spring' means located between the foot and the leaf spring.

10. A skiving machine having, in combination, a knife, a feed roll, a leaf spring fastened to a stationary part of the machine in such manner that its outer end is movable from and towards the roll, a presser foot carried by the outer end of the leaf spring, and a spring located between the inner end of the foot and theleaf spring.

11. A skiving machine having, in combination, a knife, a feed roll, a spring arm fastened to a stationary part of the machine in such manner that its outer end is movable towards and from the roll, and a presser foot yieldingly mounted on the spring arm.

outer end of the 12. A skiving machine having, in combination, a knife, a feed roll, a support, a presser foot yieldingly mounted upon the support, means for guiding the presser foot in its yielding movement, and equalizing means disposed between the presser foot and the support and tending to maintain the presser foot yieldingly in a predetermined position.

13. A skiving machine having, in combination, a knife, a feed roll, a spring arm fastened to a stationary part of the machine in such manner that its outer end is movable towards and from the roll, a presser foot carried by the outer end. of the spring arm and movable relatively thereto, and spring means yieldingly connecting the presser foot to the spring arm.

14s. A skiving machine having, in combination, a knife, a feed roll, a stationary member, a leaf spring mounted on the stationary member in such manner that its outer end is yieldable toward and from the roll, a presser foot carried by the outer end of theleaf spring, means for yieldingly opposing movement of the foot, and means constructed and arranged to prevent tilting of the presser foot about an axis parallel to the axis of rotation of the roll.

15. A skiving machine having, in combination, a knife, a feed roll, a spring arm fastened to a stationary part of the machine in such manner that its outer end is movable towards and away from the roll, a presser foot intermediately pivoted to the outer end of the spring arm, two rods secured to the presser foot, one on each side of the pivot, and a spring mounted on each rod.

16. A skiving machine having, in combination, a knife, a feed roll, a presser foot having a V-shaped recess, a support having a wedgeshaped projection pivotally disposed in the recess, and means yieldingly maintaining the wedge-shaped projection in the recess.

17. A skiving machine having, in combination, a knife, a feed roll, a leaf spring fastened to a stationary part of the machine in such manner that its outer end is movable towards and from the roll, a presser foot intermediately pivoted to the outer end of the leaf spring and having a recess, a member having a projection mounted in the recess, and spring means acting upon the presser foot upon both sides of its pivotal point.

18. A skiving machine having, in combination, a knife, a feed roll, and two members one of which comprises a presser foot having a recess and the other a support having a projection mounted in the recess, the construction and arrangement being such that the presser foot is freely pivotable about the` projection as a pivot, the recess being opensided to permit bodily separation of the members by a bodily movement of one member away from the other member in a direction at right angles to the pivotal axis.

In testimony whereof, l have hereunto subscribed my name this 11th day of October, 1928.

ANDREW R. ninnnns'rnon.

CERTIFICATE 0F CORRECTION.

Patent No. 1,721, 050. Granted July 16, 1929, to

ANDREW R. RIDDERSTROM.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, after line 123, insert the following as claim 19:

19. A skiving machine having, in combination, a knife, a feed roll, and two members, one of which comprises a presser foot that is freely movable upon the other member, one of the members having a recess and the other a projection movably disposed in the recess, whereby the presser foot is freely movable upon the other member about the projection, and the recess being opensided to permit bodily separation of the members by a sidewise movement of one of the members away from the other member.;

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 13th day of January, A. D. 1931.

M. J. Moore, (Seal) Acting Commissioner of Patents.

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