US1964829A - Skiving machine - Google Patents

Description

July 3, 1934. -A. PETERSQN ET AL 1,964,329

SKIVING MACHINE Filed Jan. 25, 1933 2 Sheets-Sheet l July 3, 1934. A-. PETERSON ET AL SKIVING MACHINE Filed Jan. 23, 1935 2 Sheets-Sheet 2 mem flafgwPeffaoW Patented July 3, 1934 SKIVING MACHINE Aaron Peterson and Philip D. Jones, Chicago, Ill.

Application January 23, 1933, Serial No. 653,027

'7 Claims.

The invention relates to a skiving machine of a type more particularly for use in skiving the soles of shoes and the leather to be used on them when a new sole is to be applied.

In repairing shoe soles, it is difficult to finish and skive the remaining portion of the old sole so that a new sole may be securely applied with a flush surface at the adjoining ends.

The chief objects of this invention are the provision of a skiving machine that is portable, compact, strong and durable, sturdy and simple in operation and in which the work support travels on an arc with the work in the path of a knife which is automatically adjusted as to the angle of its cutting edge depending upon the thickness of the leather; and whereby an old sole to be severed from the shoe is placed on the work sup port of the machine with the upper of the shoe below the support and the sole is skived at the required angle in the same operation; the sole being fed in an arc with the support affording a desirable condition at the arch of the shoe to apply a new sole.

Further objects are to provide means for yieldingly holding the work support in position and having manual means for releasing the support to permit of the starting or the withdrawal of the work.

These features are accomplished by means of the machine disclosed in the drawings forming a part of the specification; and in which;

Figure 1 is a side elevation of the machine.

Figure 2 is a top plan View.

justing the knife bracket.

Figure '7 is an enlarged perspective view of the knife blade.

Referring tothe drawings, 10 designates the frame of the machine as a whole, which is substantially U-shaped, having a base 11, an upright portion 12 and a horizontally extending top portion 13.

The portion 13 has an integral downwardly extending lug 14 at its outward end providing a bearing for a horizontally extending shaft 15 which has its other end journaled in the upright 12 of the frame 10.

Outwardly of the portion 13 adjacent the lug 14, the shaft 15 has a knurled feed r001 16.

The knurled feed roll 16 is fixed to the end of the shaft 15 outwardly of the portion 13 adjacent the lug 14, and is driven by means of a gear 17 fixed to the other end of the shaft 15 which is in mesh with a smallf er gear 18 fixed to a relatively short shaft 19 journaled below the shaft 15 in the upright 12. The gears 17 and 18 are mounted to rotate in a vertically extending elongated slot 20 in the upright 12 which guards the gears from the operator. A crank handle 21 is attached to the shaft 19 to manually rotate the feed roll 16 through the gears 18 and 17.

A work support 22 is pivotally mounted for horizontal swinging movement on a vertical shaft 23 which is supported in the base 11 at its lower end and in a lug 12a extending from the upright 12 at its upper end, below the shaft 12.

The support 22 extends outwardly of the vertical shaft 23 and is somewhat fan-shaped at its free end, forming a relatively wide flat work sur- 7'5 face 24 under the feed roll 16. This surface 24 terminates in a circumferential edge 24a and in a concentric edge 25 of a raised flat portion 26 rearwardly of the work surface 24 on which a plate 2'7 having a concentric edge 27a is secured 30 with its edge extending over the edge 25 forming a groove or guideway 28 inwardly of the work surface 24. At the work receiving end of the surface 24 the groove or guideway 28 extends beyond the starting edge 24b for guiding one end of a knife blade in the path of the work while the support is moved to starting position.

To normally hold the work support 22 in elevated position, so as to yieldingly maintain the surface 24 in close proximity with the feed roll 16, a cross-member 30 on which the lower end of the support 22 rests, is mounted for vertical sliding movement on the guide pins 31--31 positioned in the base 11 on each side of the vertical shaft 23. The cross-member 30 rests on the compression springs 23a mounted in the base 11.

A wear member 32 rests on the member 30 and is also guided on the pins 3131 with its top surface in contact with the face of a cam 33 fixed to a short shaft 34 mounted horizontally in the upright 12 and provided with a lever-handle 35 for actuating the cam. To support the lever-handle 35 in operative position, an upwardly extending stop pin 35a is fixed to the base and engages the underneath side of the lever-handle.

As thus far described, the support 22 is mounted for horizontal swinging movements and is also yieldably supported for vertical movements, permitting the support to be depressed during its swinging movement, compensating for the vari- 110 ation in the thickness of material, while the material is gripped between the surface 24 of the support 22 and the feed roll 16.

When it is desired to insert or remove the material from the machine, the lever-handle 35 is lifted, turning the cam 33 which will depress the members 32 and 30 against the tension of the springs 23a, releasing their tension on the sup port 22, and the support will follow of its own weight. It will be noted that the member 32 overhangs the lower lug 22a of the support 22 (Fig. 1) to positively insure the vertical downward movement of the support when the leverhandle 35 has been lifted.

The cross-member 30 is provided with inwardly directed lugs 30a extending into the path of travel of support 22 on each side of the lower lug 22a to limit the swinging movements of the support with respect to the feed roll 16.

The top portion 13 of the frame 10 has an integral horizontal extension 13a at its free end to which a bracket 37 is adjustably mounted for supporting a knife blade holder 38. As shown in Fig. 6 the bracket 3'7 is provided with an arcuate underneath surface 39 which rests on the extension 13a and is adjustable with respect to the frame by regulating the cap screws 40 that secure the bracket to the extension 13a.

At its outward end the bracket 37 is downwardly turned and is provided with a transverse inclined bore 37a to receive the threaded shank 41 of the blade holder 38 which is held in place by means of a knurled nut 42 threaded to the shank and provided with an annular groove or race 43.

The bracket 3'? is provided with a slot opening &4 alined with the annular groove or race 43 into which a U-key 45 extends to retain the nut 42 rotatably mounted while adjusting the blade holder with respect to the bracket.

A lock nut 4'7 is threaded to the shank 41 of the blade holder to securely lock the nut 42 to the shank, permitting of a rocking motion of the blade holder while held with respect to its longitudinal movement.

The holder 38 is provided with a dove-tail 48 into which a knife blade having a corresponding dove-tailed edge is inserted and securely held by means of the set screws 50.

The knife blade 49 has its free end portion out at an angle 51 providing a cutting edge longer than the back portion of the blade, forming a point 52 that extends into the groove 28 on the work support. a

With this arrangement of a blade. holder and knife blade having its free end guided in a groove in the support, it is only necessary to adjust the blade position in the holder 38 so as to have the point 52 in the groove 28 while the support 22 is normally at rest and the holder and the cutting edge of the blade on a horizontal line with respect to the feed roll. The angle of the skived edge of the shoe sole and the leather to be applied thereto, depends upon its thickness, as the thickness of the leather between the support 22 and the feed roll 16 causes the support to be depressed against the tension springs 23a, causing the knife blade to be rocked on the shank 41 in'the bracket 38 thereby automatically adjusting the cutting angle of the knife. As the material to be skived is placed into the machine and the support is depressed by means of the lever-handle 35, the lever-handle is then restored to its resting position on the pin 35a, permitting the tension of the springs 23a to maintain a constan yielding presser on the work to compensate for any irregularity in the material.

It is common practice to skive the sole of a shoe at the instep when a new half sole is to be applied, and with a device as above described, the skived edge is uniform and smooth as the work when once placed in the machine travels with the work support, the portion being severed also rests on and travels with the support, thereby feeding the sole of the shoe in a horizontal path and preventing the portion being severed from sagging.

We contemplate as being included in these improvements all such changes, variations and departures from what is thus specifically illustrated and described as fall within the scope of the appended claims.

We claim:

1. A skiving machine comprising in combination a frame, a work support having guide means thereon and pivotally mounted to swing in a path on said frame, a work feed element coacting withthe free end of said support, a knife supported for rocking movement on the frame in the path of the work travel with its free end guided in said guide means, and tension means permitting yieldable vertical movement of the support while in its swinging movements.

2. A skiving machine comprising in combination a frame, a work support having an arcuate groove therein near the free end thereof and pivotally mounted to swing in a path on said frame, a blade having a cutting edge and supported at one end for rocking movements on the frame in the path of the work travel, said blade having its free end guided in the arcuate groove in said support, a knurled feed roll pivotally mounted on the frame in the path of the work travel, spring tension means exerting a pressure against a downward movement of the support, and means including reduction gearing for rotating the feed roll to grip and feed the work into the path of the knife.

3. A skiving machine comprising a substantially U-shaped frame, a work support having an arcuate groove therein and mounted for swinging movement on the frame, a knife blade pivotally mounted at one end in a bracket on the frame, said bracket being adjustable with respect to the frame, said blade having its free end guided in said groove in the work support with the cutting edge in the path of the work, and a feed roller journaled in the frame to grip and feed the work into the path of the knife blade while the support is traveling with the work.

4. A shoe sole skiving machine comprising a substantially U-shaped frame, a work support having an arcuate guide means therein, said support being mounted for swinging movement adjacent one leg of the frame providing a space therebetween, a knife pivotally mounted at one end in a bracket on said leg of the frame in the path of the work travel, said knife blade having its free end guided in said arcuate guide means in the support, and a feed roller journaled in said leg of the frame in the path of the work to grip and feed the work into the path of the knife to skive the sole of a shoe, permitting the severed portion thereof to freely pass through said space.

5. A machine for severing and skiving a shoe sole comprising in combination a frame having an overhanging portion, a Work support having guide means thereon and being pivotally mounted for swinging movement on the frame adjacent the overhanging portion providing a space therebetween, a knife blade having one end pivotally mounted in a bracket on the frame with its free end engaged by said guide means on the support, and a feed roller journaled in the overhanging portion of the frame to advance the work into the knife blade, the severed portion of the sole being free to pass through said space.

6. A device of the character described, comprising a frame, a work support having guide means thereon and being pivotally mounted on the frame to swing in a path, a feed roller on said frame coacting with the Work support, an adjustable bracket on the frame for supporting a blade holder, the blade holder being pivotally mounted and adjustably supported in said bracket, and a knife blade carried by and adjustably supported in said blade holder with its free end engaged by said guide means.

7. A device of the character described, comprising a frame, a work support having guide means thereon and being pivotally mounted on the frame to swing in a path, a feed roller on

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