US2303439A - Machine for roughing shoe parts - Google Patents

Description

Dec. 1, 1942. cuozzc) 2,303,439

MACHINE FOR ROUGKING SHOE PARTS Filed Nov. 18, 1940 s Shefcs-Sheet 1 A/vE/v 70/? M 6 s 1:1,

Dec. 1, 1942. cuozzo 2,303,439

MAGHFENE FOR ROUGHING SHOE PARTS Filed Nov. 18, 1940 3 Sheets-Sheet 2 N/E/vmQ 8 W? M a M. cuozzo MACHINE FOR ROUGHING SHOE PARTS Dec; 1, 1942.

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Filed Nov. 18, 1940 Patented Dec. 1, 1942 MACHINE FGR ROUGHING SHOE PARTS Michele Cuozzo, Lynn, Mass assig'nor to United Shoe Machinery Corporation, Flemington, N. J a corporation of New Jersey Application November 18, 1940, Serial No. 366,059

Claims.

This invention relates to machines for roughing shoe parts and is hereinafter described as embodied in a machine for producing a superior type of roughing upon the marginal portion of a shoe part, such as a sole, to prepare it for the reception of cement by which it is to be attached to another shoe part, in this case the shoe upper.

In the manufacture of shoes by the cement process, it is of the utmost importance that the cement employed to secure the shoe parts together shall be bonded as strongly as possible to said parts. To this end, especially when the material used is leather, it is necessary to prepare the surface of the work for the reception of the cement by a roughing operation since, otherwise, the security with which the cements commonly used (pyroxylin for example) are bonded to the leather is apt to be inadequate.

It is an object of the present invention to produce an improved machine by .the use of which a shoe part can be accurately and effectively roughed in such a manner that an extremely strong bond between the cement and the shoe part will be obtained.

To this end, a feature of the invention comprises the combination with means for feeding a work piece, such, for example, as a shoe sole, progressively past an operating station of a power-operated tool arranged to cut a multitude of closely adjacent gashes into the substance of a work piece by a chopping action. In the illustrated machine, a reciprocating tool, somewhat resembling a chisel, is employed and the work is fed intermittently, a short distance at a time, between successive penetrations of the chopping tool into its substance. The edge of the chisellike tool is preferably scalloped so that each gash made by the tool forms a series of small flaps or tabs which will be caught and embedded in the cement and will provide a very strong bond therewith. As shown, the tool is forced into the work in a direction at an oblique angle to the surface thereof to the end that the said flaps or tabs shall be raised somewhat from the general surface of the work piece and, thus, the penetration of the cement will be facilitated.

The illustrated machine is provided with solefeeding mechanism which is entirely automatic in its action and is capable of advancing the marginal portion of a sole progressively past the chopping tool, even at the sharply-curved portions of the sole edge, such, for example, as at the toe, without requiring any assistance from the operator.

These and other features of the invention will 55 chines.

be understood and appreciated from the following detailed description of one practical embodiment thereof when read in connection with the accompanying drawings, in which.

Fig. l is a vertical, central section of the machine, taken from front to rear;

Fig. 2 shows the front of the machine in elevation;

Fig. 3 is an angular View of the tool upon an enlarged scale;

Fig. 4 is a view in front elevation of the workfeed mechanism; and

Fig. '5 is a diagrammatic plan view showing the relation'of the direction of application of workfeeding force to the positions of the work-guiding edge gages.

Referring now to Figs. 1 and 2, it] indicates a frame in which is journaled a rotary shaft I2 having secured thereto a pulley l4 driven continuously by a belt it. At the front end of the shaft I2 is a crank is which, through a connecting rod 29, causes continual rapid vertical reciprocation of a tool bar 22 as the shaft rotates. The bar 22 is guided for sliding movement in bearings formed in brackets 24 and 26 integral with the frame Hi. To the lower end of the tool bar 22 is secured, by screws 28, a chopping tool 35) which is best shown in Fig. 3. All of the cutting edge 32 of the tool lies in the same horizontal plane, but it is formed in a series of scallops, as shown, in order to produce at each penetration of the tool into the work a row of flaps or tabs as illustrated at 36 (Fig. 5). The curved wall 36 of each recess in the tool is approximately vertical and the outside of the tool is beveled off at the back, as shown at 38, in order to produce the cutting edge.

The work piece, in this instance a shoe sole 4!],

rests upon and is fed over an inclined work supporting table 42 which is mounted upon a stationary extension 44 of the frame I 0. The inclination of the table 42 is downward in the direction in which the sole is advanced and, as a result, the gashes formed in the sole by the tool 30 are oblique to the surface of the sole. The stroke of the tool 35) is such that it penetrates the sole only a short distance, to a depth shown by the dotted line indicating the position of the cutting edge 32 in Fig. 1.

The intermittent advance of the sole past the chopping tool is effected by the feed mechanism illustrated in Figs. 1 and 4, most of which is already known in the conventional four-motion work-feeding mechanism employed in sewing ma- This mechanism is actuated by a crank 46 and a cam 48 upon the shaft I2. The cam 48 is embraced by the forked upper end of a cam lever 50, which is pivoted at 52 to the upper end of a rocker arm 54 mounted to oscillate about a stationary pivot 56 fixed in the frame I0. The lower end of the cam lever 50 is pivotally connected at 58 to a rocker arm 60 secured upon the rear end of a rock shaft 62 which is J'ournaled for oscillation in the frame I0. Integral with the front end of the rock shaft 62 is a disk 64 in which is formed a straight guideway 06 extending in an approximately vertical direction. A slide 68, which is movable in the guideway 66, has an upwardly projecting finger I surrounded by a collar 12 which is-rotatable upon ball bearings and is slidable longitudinally of said finger. A work-feeding claw I4 is secured by a set screw I6 to the upper end portion of the finger I0 and a compression spring I8, interposed between the hub of the claw and the collar I2, tends to keep the collar down upon the surface of the work table 42, regardless of the movement of the finger I0 and claw I4.

The slide 68 is provided with an aperture 88 in which a cam 82 engages. This cam is formed upon a rock shaft 84 which is journaled for oscillatory movement in the disk 64. The rear end of the rock shaft 84 carries a rocker arm 86 upon the outer end of which is a roll 88.

A connecting rod 90 extends downward, from the crank 46 and its lower end is pivoted at 92 to an arm 94, which is rigid with a rock shaft 06 mounted for oscillation upon the stationary beartable 42 by a set screw I08 passing through a slot H0 in the plate I08.

By reference to Fig. 5, it will be seen that the feeding force exerted upon the 501g 40 by the i straight or not too sharply curved, but, in order to insure perfect work feeding at portions of the work piece where the edge is sharply curved, as at the toe portion of a sole, the turning of the sole may be aided by applyin a retarding force to it at some point near the center of curvature of the sole edge. For this purpose, I have provided a ball I I2 mounted in the lower end of a rod II4 which is freely slidable up and down through guiding sleeves I I6, I I8 having spherical outer surfaces and mounted respectively in holders I28 and I22. The holder I is stationary and is mounted upon the front of the bracket 28, while the holder I22 consists of a block which is adjustable forward and rearward in a supporting frame I24 wherein the block is held in adjusted ings in the frame I0. Extending upward from the rock shaft 96 is an arm 90 the upper portion of which is forked, as shown at I00, and embraces the roll 88.

The operation of the above-described mechanism is as follows. During each rotation of the shaft I2, the crank will cause one complete reciprocation of the connecting rod 90 and, consequently, one complete oscillation of the rock shaft 96 and the arm 98 thereon. This, by reason of the engagement of the roll 88 in the fork I00, effects a complete oscillation of the rock shaft 84 and the cam 82 at the front end thereof, the cam, in turn, causing the slide 68 and the work-feeding claw to move up and down. While this is occurring, the cam 48 upon the shaft I2 effects a rocking movement of the cam lever 50,

which is hung upon the link 54, causing the link to swing about its fixed pivot 58 with the result that the cam lever is moved up and down and oscillates the rock shaft 62 and the disk 84.

The total result of these operations is to impart to the feed claw I4 a four-motion feed movement during which it descends into engagement with the sole, advances the sole a short distance along the table 42, rises away from the sole, and n returns, out of engagement with the sole, to initial position ready for repetition of the cycle of feeding movement. Each revolution of the shaft I2 causes one such complete cycle. The distance through which the sole is advanced in each step of the feeding movement is preferably not much, if any, greater than the depth of the scallops formed by the cutting edge of the tool 30, and the result of the combined operation of the tool and the feed mechanism is a multitude of closely adjacent gashes cut into, but not through, the

substance of the sole.

Th collar I2 is utilized as an edge gage for guiding the sole in its advancing movement and a second edge gage or guide I02, consisting of a roll mounted upon a screw I04 carried by a plate I08, is adjustably held in position upon the work position by a nut I26 threaded upon a bolt extending from the holder block I22 through a slot I28 in the side of the frame. The frame I24 is mounted for circular adjustment about a screw I38 by which the frame is secured to the front portion of the upper bracket 24.

The sleeves H6 and H8 are held loosely in their respective holders so that they are free for universal movement therein, and it is apparent that the structural arrangement described above permits universal adjustment of the lower end of the rod II4 about a point which is at the center of the spherical sleeve H6 and that, consequently, the ball II2 may be positioned to engage the sole 40 at any desired point. In order that the ball may press upon the sole with sufficient force to produce the desired retarding effeet, the upper portion of the rod H4 is surrounded by a compression spring I32 bearing against the under side of the block I22 and" against a collar I34 adjustably secured to the rod II4 by a thumb screw I35. A handle I38, secured to the rod II4 by a set screw I40, facilitates the lifting of the rod II4 by the operator when a sole is being placed in position to be operated upon.

Inasmuch as the marginal portions, and particularly the shank portions, of a sole are often beveled while the entire cutting edge of the tool lies in a horizontal plane, provision is made for so presenting the sole to the tool that the entire cutting edge of the tool will enter the sole to the samedepth. For this purpose there is provided a supporting element I42 which is movable about a stationary pivot I44 from a horizontal position in which its upper surface is flush with the upper surface of the work table surface of the sole parallel to the plane of the cutting edge of the tool.

From the foregoing it may be understood that, in the operation of the machine, a sole will be automatically advanced step by step in timed relation to the reciprocations of the tool 30, with the edge of the sole against the edge gages 12, I02 and that the tool will be caused to make an inclined chopping cut into the upper face of the sole during each period of rest in the advancing movement of the latter, with the result that a pattern of cuts or gashes, resembling that shown at 34 in Fig. 5, will be produced, forming a multitude of small elevated flaps or tabs around and beneath which cement will flow readily to provide an exceptionally strong bond or anchorage of the cement to the sole.

Having described the invention, what is claimed as new and desired to be secured by Letters Patent of the United States is:

1. In a roughing machine for shoe parts, the combination of a power-operated, reciprocating, chopping tool, means for supporting a shoe part in such relation to said tool that the tool will cut into, but not through, the shoe part, and work engaging means exclusive of the chopping tool for feeding the shoe part progressively over the supporting means in position to be operated upon by the tool.

2. In a sole roughing machine, the combination of a power-operated, reciprocating, chopping tool, a work support adjacent to said tool in such relation to the path of movement thereof that the tool will cut into, but not through, a sole upon said support, and sole engaging means exclusive of the chopping tool for feeding a sole intermittently over the support between successive penetrations of the tool into the sole.

3. In a sole roughing machine, the combination of a power-operated chopping tool having a scalloped cutting edge, a work support adjacent to said tool in such relation to the path of movement thereof that the tool will cut into, but not through, a sole upon said support, and sole engaging means exclusive of the chopping tool for feeding a sole intermittently over the support in steps approximating the depth of the scallops in the cutting edge of the tool.

4. In a sole roughing machine, the combination of a power-operated roughing tool, a work support in operative relation to the tool, means for feeding the marginal portion of a; sole over the work support past the tool, sole edge guides arranged to engage the sole at opposite sides of the line in which feeding force is applied to the sole, and a retarding device arranged to engage the surface of the sole at one side of the feeding means opposite to one of the edge guides.

5. In a sole roughing machine, the combination of a power-operated roughing tool, a work supporting table in operative relation to the tool, a pair of sole edge guides above the surface of said table, a retarding device spaced laterally from said guides and arranged to engage a sole upon the table, and sole feeding means engaging the sole between the retarding device and the edge guides.

- MICHELE CUOZZO.

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