US3031873A

US3031873A - Skiving machines

Info

Publication number: US3031873A
Application number: US103934A
Authority: US
Inventors: Jr Oliver C Brett
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1961-04-18
Filing date: 1961-04-18
Publication date: 1962-05-01
Anticipated expiration: 1979-05-01
Also published as: DE1435310A1; GB1003743A

Description

May 1, 1962 o. c. BRETT, JR

SKIVING MACHINES 3 SheetsSheet 1 Filed April 18, 1961 Inventor 01 we)" 6'. Brett Jr: By hzs/htorney May 1, 1962 o. c. BRETT, JR 3,031,873

SKIVING MACHINES Filed April 18, 1961 3 Sheets-Sheet 2 Z 4 6 14 W W 11 12 M k M y 1962 o; b. BRETT, JR 3,031,873

SKIVING MACHINES Filed April 18, 1961 3 Sheets-Sheet 3 Unite i grates 3,031,873 SKIVING MACIENES Oliver C. Brett, In, West Boxford, Mass., assignor to United Shoe Machinery Corporation, Flemington, NJ., a corporation of New Jersey Filed Apr. .18, 1961, Ser. No. 103,934 9 Claims. (Cl. 69-16) This invention relates to skiving machines in general and more particularly to machines which will produce a scarf containing a groove. One type of skiving machine which has been in commercial use for many years is made in accordance with United States Patents Nos.

1,652,513 and 1,866,918, granted to Milton H. Ballard, December 13, 1927, and July 12, 1932, respectively. In the Ballard type skiver, a work piece, often shoe upper leather, is fed to a rotary disk knife by a feed roll and a presser member which urges the work piece against the roll. The edge of the disk knife is located in close proximity to the upper edge of the roll whereby a scarf is cut on the work piece immediately as it emerges from between the roll and the presser member. The angle of the scarf may be varied by varying the relative angular positions of the knife and roll.

To vary the angular relationship in a machine made in accordance with the above-identified Ballard patents,

the feed roll is mounted in a carrier which is angularly adjustable relative to the knife. The presser member is also mounted on the carrier, so that its relationship to the roll remains constant. It is, therefore, possible on the Ballard machine to produce a feather edge scarf, a flat or shoulder scarf, as well asrcombinations of both, by angular adjustment of the carriage which is accomplished by treadle operation.

On a bal shoe upper both types of scarfs are frequent; ly required. A feather edge scarf is formed along the lower margin where it extends beneath and is sewed to the upper margin of the vamp. A shoulder scarf is formed along the upper margin where it is folded over to make a finished top edge for the shoe. When relatively stiff heavy leathers are used for shoe uppers, the folding operation is simplified and the final product is substantially improved if a groove is formed in the scarf on the flesh side of the leather along the line where it is to be folded.

Accordingly, one object of this invention is to provide a skiving machine capable of producing a scarf containing a groove.

Another object of the invention is to provide a skiving machine capable of producing a scarf either with or without a groove, depending on operator selection.

Still another object of this invention is to provide a skiving machine capable of producing a groove in either a feather edge or shoulder scarf or combination of both.

A further object of this invention is to provide a skiving machine capable of automatically producing a groove in a scarf, the depth of the groove being directly related to the angle of the scarf.

The invention is hereinafter illustrated in a machine similar to that shown in the above-identified Ballard patents to which attention is directed for a complete description of the skiving instrumentalities and their operating mechanisms. As a feature of this invention, there is provided a riser in the form of a dog or similar projection extending from a slot in the periphery of the feed roll toward the presser member. As the work piece is fed by the feed roll over the riser, an elongated area of intensified compression is produced which, when presented to the skiving knife, results in a groove being formed in the skived surface. The riser in its operative position is in alignment with the presser member which may be slotted to facilitate formation of a bulge rather I 3,031,873 Patented May 1,1962

than a compressed area which results in a narrower deeper groove.

During the time the riser is in operative position to form the bulge or compressed area, it is stationary with respect to the feed roll and presser member. Were the riser, on the other hand, an annular rib formed on the feed roll and therefore rotatable with the roll, it would be impossible to form a scarf that did not contain a groove. In order not to limit the machine to the production of grooved scarfs, the riser is secured to an arcuate plate which is adjustable within a slot in the periphery of the feed roll. By rotating the plate, the riser may be moved away from the presser member and knife into an inoperative position. Means are also provided on the machine to lock the plate and consequently the riser in its inoperative position.

Since it is more frequently required to form a groove in a shoulder scarf than in a feather edge scarf, the riser plate is linked to the carrier which mounts the feed roll so that the riser is automatically in operative position to form the bulge or compressed area, and hence, a groove of maximum depth, when the axis of the feed roll is parallel to the skiving knife, i.e., the position which produces a shoulder scarf. When the machine is treadled to vary the angle of the feed roll for the formation of a feather edge scarf, the riser is proportionately withdrawn from vertical alignment with the presser member. When the carriage is moved only a slight amount to produce a tapered shoulder scarf, i.e., one that has a slight shoulder and tapers almost to a feather edge, the riser is withdrawn a proportionate amount from vertical alignment with the presser member resulting in a groove of lesser depth. Full trcadling of the machine results in a full feather edge scarf with complete withdrawal of the riser and hence no groove. In order to render theriser completely inoperative in any portion of angular adjustment of the feed roll, manual means are provided for locking the plate and its riser out of operative position whereby no groove is produced.

The above and other features of the invention including various novel details of construction and cornbinations of-parts will now be more particularly described with reference to the accompanying drawings and pointed out in the claims. It will be understood that the particular machine embodying the invention is shown by way of illustration only and not as a limitation of the invention. The principles and features of this invention may be employed in varied and numerous embodiments without departing from the scope of the invention.

In the drawings,

FIG. 1 is a rear elevation of the operating instrumentalities of a skiving machine of the Ballard type incorporating the invention;

FIG. 2 is a right side elevation of the portion of the machine shown in FIG. 1;

FlGS. 3 and 4 are enlarged schematic views of the feed roll and presser member of the machine'cooperating to feed a work piece to be skived, FIG. 3 showing a slotted presser member and FIG. 4 a flat presser member;

FIGS. 5 and 6 are sectional views, on enlarged scale, of work pieces skived by the machine employing the mechanism shown in FIGS. 3 and 4, respectively;

FIGS. 7 and 8 are sectional views of a conventional flat or shoulder scarf, the FIG. 8 scarf having a groove;

FIGS. 9 and 10 are sectional views of the scarfs shown in FIGS. 7 and 8, respectively, after they have been folded;

FIGS. 11 and 12 are sectional views of a conventional feather edge scarf, the FIG. 12 scarf having a groove;

FIGS. 13, l5, l7 and 19 are schematic front elevational views of the skiving instrumentalities of the machine in various relative positions; and,

3 FIGS. 14, 16, 18 and 20 are schematic side elevational views showing the corresponding positions of adjustment of the riser.

Referring first to FIGS. 7 through 12, there are shown sectional views of various scarfs which may be produced on machines embodying the present invention. FIG. 7 illustrates a work piece W having a flat or shoulder scarf. The skived portion 2 is approximately one-half the thickness of the unskived portion 4. After the work piece is skived it is subsequently folded as shown in FIG. 9, with the free end 6 abutting the shoulderS. Note in FIG. 9 that the fold 1t) bulges and thereby produces a margin which is somewhat thicker than the unskived portion 4 of the work piece. This is particularly prevalent when relatively stiff leather is folded.

FIG. 8 shows a flat or shoulder scarf similar to FIG. 7 but provided with a longitudinal groove 12 formed 'by a machine embodying the invention. Forming a groove in the scarf is advantageous since it takes the inherent fight or tendency to return to unfolded condition out of the leather. When this scarf is folded along the groove 12 as shown in FIG. 10, not only is the folding process made easier but the fold 14 does not bulge and is virtually the same thickness as the unskived portion 4 of the work piece which is more desirable than the FIG. 9 fold. FIG. 11 is a sectional view of a work piece W provided with a feather edge scarf 16. FIG. 12 shows a scarf similar to that of FIG. 11 but provided with a longitudinal groove 18 also formed by a machine embodying the invention. It will be noted that the groove 18 is wider and shallower than the groove 12 of FIG. 8. Although a feather edge scarfs are not as frequently required to be folded, they may be folded in the same manner as the shoulder scarfs of FIGS. 7 and 8 with comparable results.

Referring next to FIGS. 1 and 2, there are shown rear and right side elevational views respectively of the operating instrumentalities of a skiving machine similar to that disclosed in the above-identified Ballard patents to which reference may be had for a more detailed description of the entire .machine. Briefly, the machine includes a rotary disk skiving knife 20 which is mounted on a shaft 22. While the knife is shown in the above-identified Ballard patents to be adjustable, for the purposes of this invention it may be considered to be stationary and rotated about the axis of the shaft 22 with its cutting edge in a plane P. A feed roll 24 is mounted on a shaft 26 journaled in a bracket 28 and driven from a pulley 30 by a belt (not shown). Cooperating with the feed roll 24 is a feed disk 32 similar to those shown in the Ballard patents. The work is fed out of the plane of the drawings and toward the viewer as seen in FIG. 1 and from right to left as seen in FIG. 2. A presser member 34 urges the work piece against the periphery of the feed roll 24. The presser member is mounted on a stud 36 which is adjustably secured in a bracket 38 which, although not shown in the drawings, is secured to the feed roll bracket 28. The presser member 34 is urged downwardly relatively to the bracket 38 and toward the feed roll 24 by a coil compression spring 40. An edge gage 42 depends from the presser member bracket 38 and is engageable with the work piece adjacent the left-hand edge of the feed roll 24. The edge of the knife 20 is located in close proximity to the upper periphery of the feed roll 24 whereby the scarf is cut on the work piece immediately as it emerges from between the roll and the presser member 34 traveling from right to left as seen in FIG. 2.

As described in the Ballard patents, the feed roll and the presser member are adjustable to vary the angle at which the work piece is presented to the plane P of the knife 20. The feed rol-l bracket 28 is mounted on a carrier bracket 44 by a conventional slot and screw connection 46. The carrier bracket is secured to an arcuate dovetail carrier 48 which is slidable in

guides

50, 52 secured to a portion 54 of the main machine frame. One end of a treadle rod 56 is connected to a treadle (not shown) and the other end is pivoted on a pin 58 fitted in a slotted forward portion of the carrier 48. When the machine is treadled, the rod 56 advances or retracts the carrier 43 relative to the machine frame. By this mechanism the axis of the feed roll 24 and hence its periphery is adjustable relative to the knife plane P has shown in FIGS. l3, 15, 17 and 19 to produce either ashoulder scarf, a feather edge scarf or combinations of both. The amount of angular adjustment is indicated by a pointer 6% on a scale 62.

As a feature of this invention, there is provided a riser 64 in the form of a dog projecting from the periphery of the feed roll 24 toward the presser member 34. The riser is formed on a substantially U-shaped plate 66 which fits slidably within a groove 68 in the feed roll.

The ends of the plate 68 are joined by a linking member 70 which is attached to a rearwardly projecting finger '12. An operating lever 74 is pivoted on a stud 76 threaded into the frame portion 54. The upper edge of the operating lever 74 is engageable with the lower edge of the finger 72 to impart movement to the plate 66 and riser 64. The finger 72 is normally held in engagement with the operating lever 74 by a spring 78 stretched between the linking member 70 and a block 80 secured to the carrier guide 50.

Vertical alignment between the riser 64 and the presser member 34, as seen in FIG. 2, is obtained by rotating an adjusting screw 82 engageable with the lower edge of the operating lever 74 and threaded in the block 80. A lock 84 secures the screw 82 in any desired position.

Motion is transmitted to the operating lever 74 from the carrier 48 by an eccentric stud 86 threaded in the carrier bracket 44 and engageable with the lower surface of the lever 74. The amount of angular displacement of the riser 64 from the solid to broken line positions shown in FIG. 2 when the carrier is moved is controlled by rotating the eccentric stud 86.

The riser operating mechanism may be rendered inoperative at the option of the operator by the movement of a bell crank lever 90 from the solid to broken line positions shown in FIG. 1. The lever 90 is pivoted on a stud 92 threaded in the block 80 with its lower arm held by a tension spring 94 in engagement with a stud 96 also threaded in the block. The ends of the spring 94 are secured to the upper arm 98 and the block 80. When the operator moves the lever 90 from the solid to broken line positions, the spring passes dead center of the stud 92 and the end of the upper arm 98 engages the operating lever 74 elevating it to the broken line position thereby rotating the riser plate 66 in a clockwise direction to withdraw the riser from vertical alignment with the pressure member 34. By selective use of the lever 90, the operator is able to prevent a groove from being formed in the scarf at whatever angle the feed roll is positioned relative to the knife plate.

The pressure member 34 is seen in FIGS. 1 and 3 to include a slot 100 in vertical alignment with the riser 64. The presser member may also be unslotted as shown in FIG. 4 depending upon the type of groove it is desired to produce. The feed roll 24 and the pressure member 34 normally tend to compress the work piece W slightly as it is fed to the skiving knife and if it is desired to produce a relatively broad and shallow groove 12' (FIG. 6) an unslotted .presser member 34 would be employed. As the work piece moves between the feed roll and presser member, the riser '64 produces an elongated area of in: tensified compression as shown in FIG. 4 which, when cut by the skiving knife, results in a greater depth of stock being removed from the compressed area than the remaining portion of the scarf. However, where it is desired to produce a narrower and deeper groove 12 as shown in FIG. 5, a slotted presser member is employed. Here the riser 64 cooperates with the slot 100 in the presser member to form an elongated bulge in the flesh side of the work piece.

The relationshipof the angle of the scarf to the posi* tion of the riser will now be described with reference to FIGS. 13 to 20. Since it is more frequently advantageous to form a groove in a'shoulder scarf than in a feather edge scarf, the riser plate 66 is positioned by the carrier 48 so that the riser is automatically in operative position to form the bulge or compression area, and hence, a groove of maximum depth when the axis. of the feed roll is parallel to the plane P of the skiving knife, i.e., the position which is represented by FIGS. 13 and 15. In FIG. 16 the riser 64 will be seen to be in vertical alignment with the grooved presser member 34. However, in FIGS. 13 and 14, the riser is withdrawn from alignment which represents the positions the riser will occupy when the manual selecting lever 90 has disengaged the operating lever 74 from the carrier, i.e., the position in which no groove will be formed. FIGS. 17 and 18 show the feed roll 24 in position relative to the knife to produce a feather edge scarf. In this position the riser is automatically rotated by the carrier through the eccentric 86 and the lever 74 into an inoperative position similar to that which it occupies in FIG. 14. FIGS. 19 and 20 show the riser in an intermediate position where the machine has been partially treadled to produce a tapered shoulder scarf and wherein the riser is only partially withdrawn from vertical alignment with the presser member thereby resulting in less compression of the work piece and hence a shallower, wider groove.

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

1. A skiving machine having, in combination, a feed roll engageable with a work piece, a presser member for urging the work piece against the feed roll, a skiving knife positioned adjacent the feed roll to cut a scarf on the work piece as it emerges from between the feed roll and the presser member, and a rigid work engaging riser projecting from a slot in the periphery of the feed roll toward the presser member for'creating between them an elongated area of intensified compression in the work piece whereby the skiving knife cuts a grooved scarf.

2. A skiving machine having, in combination, a feed roll engageable with a work piece, a presser member for urging the work piece against the feed roll, a skiving knife positioned adjacent the feed roll to cut a scarf on the Work piece as it emerges from between the feed roll and the presser member, a rigid work engaging riser projecting beyond the periphery of the feed roll toward the presser member, and a slot in the presser member in alignment with the riser, said slot and riser creating between them an elongated bulge in the work piece whereby the skiving knife cuts a grooved scarf.

3. A skiving machine having, in combination, a feed roll engageable with a work piece, a presser member for urging the work piece against the feed roll, a skiving knife positioned adjacent the feed roll to cut a scarf on the work piece as it emerges from between the feed roll and the presser member, a rigid Work engaging riser projecting beyond the periphery of the feed roll toward the presser member for creating between them an elongated area of intensified compression in the work piece whereby the skiving knife cuts a grooved scarf, and selectively operated means for rendering said riser inoperative to form a groove in the scarf.

4. A skiving machine having, in combination, a feed roll engageable with a work piece, a presser member for urging the work piece against the fee-d roll, a skiving knife positioned adjacent the feed roll to cut a scarf on the work piece as it emerges from between the feed roll and the presser member, a movable carrier mounting the feed roll for adjustment relative to the skiving knife to vary the angle of the scarf, a work engaging riser projecting beyond the periphery of the feed roll toward the presser member for creating between them an elongated area of intensified compression in the work piece whereby the skiving knife cuts a grooved scarf, and means operative in response to movement of the movable carrier for automatically adjusting the riser relative to the presser member to vary the amount of compression in the work piece whereby the depth of the groove varies automatically with the angle of the scarf.

5. A skiving machine having, in combination, a feed roll engageable with a work piece, a presser member for urging the work piece against the feed roll, a skiving knife positioned adjacent the feed roll to cut a scarf on the work piece as it emerges from between the feed roll and the presser member, a movable carrier mounting the feed roll for adjustment relative to the skiving knife to vary the angle of the scarf, a work engaging riser projecting beyond the periphery of the feed roll toward the,

presser member for creating between them an elongated area of intensified compression in the work piece whereby the skiving knife cuts a grooved scarf, means operative in response tomovement of the movable carrier for automatic adjustment relative to the presser member to vary the depth of the groove in accordance with the angle of the scarf, and selectively operated means for operatively disconnecting the riser from the carrier and rendering it ineffective in compressing the work piece to eliminate the groove from the scarf.

6. A skiving machine having, in combination, a feed roll engageable with a work piece, a presser member for urging the work piece against the feed roll, a skiving knife positioned adjacent the feed roll to cut a scarf on the work piece as it emerges between the feed roll and the presser member, a work engaging riser projecting beyond the periphery of the feed roll toward the presser member to form an elongated area. of intensified compression in the work piece whereby the skiving knife cuts a grooved scarf, an arcuate plate mounting the riser and movable within an annular depression in the feed roll, and means for rotating the plate from a position where the riser is opposite the presser member to form in the work piece an area of maximum compression through intermediate positions to an inoperative position Where the riser is spaced sufliciently from the presser member as not to compress the work piece.

7. A skiving machine having, in combination, a feed roll engageable with a work piece, a presser member for urging the work piece against the feed roll, a skiving knife positioned adjacent the feed roll to cut a scarf on the work piece as it emerges from between the feed roll and the presser member, a movable carrier mounting the feed roll for adjustment relative to the skiving knife to vary the angle of the scarf, a work engaging riser projecting beyond the periphery of the feed roll toward the presser member for creating between them an elongated area of intensified compression in the work piece whereby the skiving knife cuts a grooved scarf, an arcuate plate mounting the riser and movable within an annular depression in the feed roll, and means operated by the movable carrier for automatically adjusting the plate to vary the depth of the groove in accordance with the angle of the scarf.

8. A skiving machine having, in combination, a feed roll engageable with a Work piece, a presser member for urging the work piece against the feed roll, a skiving knife positioned adjacent thefeed roll to cut a scarf on the work piece as it emerges from between the feed roll and the presser member, a movable carrier mounting the feed roll for adjustment relative to the skiving knife to vary the angle of the scarf, a work engaging riser projecting beyond the periphery of the feed roll toward the presser member, a slot in the presser member in alignment with the riser, said slot and riser creating between them an elongated bulge in the work piece whereby the skiving knife cuts a grooved scarf, an arcuate plate mounting the riser and movable within an annular depression in the feed roll, and

means operated by the movable carrier for automatically 7 adjusting the plate from a position where the riser is opposite the slot in the presser member to create a bulge of maximum magnitude through intermediate positions to an inoperative position where the riser is spaced sufliciently from the presser member so as not to create a,

bulge.

9. A skiving machine having, in combination, a feed roll engageable with a work piece, a presser member for urging the work piece against the feed roll, a skiving knife positioned adjacent the feed roll to cut a scarf on the work piece as it emerges from between the feed roll and the presser member, a movable carrier mounting the feed roll for adjustment relative to the skiving knife to vary the angle of the scarf, a work engaging riser projecting beyond the periphery of the feed roll toward the presser member, a slotin the presser member in alignment with the riser, said slot and riser creating between them an elongated bulge in the work piece whereby the skiving knife cuts a grooved scarf, an arcuate plate mounting the riser and movable within an annular depression in the feed roll, means operated by the movable carrier for automatically adjusting the plate from a position where the riser is opposite the slot in the presser member to create a bulge of maximum'magnitude through intermediate positions to an inoperative position where the riser is spaced sufficiently from the presser member so as not to create a bulge, and means for locking the riser in said inoperative position.

No references cited.