US2494710A - Machine for abrading shoe parts - Google Patents

Description

Jan, 17,1950 N. H. KNOWLTON MACHINE FOR ABRADING SHOE PARTS Filed July 17, 1947 l 11 Dental" Norduzmd HKHOwHOn Patented Jan. 17, 1950 MACHINE FOR ABRADING SHOE PARTS Norwood H. Knowlton, Rockport, Mass, assignor to United Shoe Machinery Corporation, Flemington, N. J a corporation of New Jersey Application July 17, 1947, Serial No. 761,498

1 Claim.

This invention relates to abrading machines and is herein disclosed as embodied in a machine suitable for buffing work pieces of sheet material such as shoe soles or similar articles. Machines of this type are commonly provided with brushes for removing dust which has been raised upon the surface of the work piece by the buffing roll.

It is an object of the present invention 'to provide an improved machine of the type under consideration. In accordance with this object a feature of the illustrated machine consists in the provision of a feed roll for holding the Work piece in contact with the buffing roll and a second feed roll for holding the work piece in contact with the brush, the second feed roll being capable of engaging the leading end of the work piece before the trailing end has passed the first feed roll. As shown herein, separate throat plates are provided for cooperating with the feed rolls for controlling the feed of the work piece through the machine. The fact that the second-mentioned feed roll with its throat plate controls the feed of the work piece in the vicinity of the brush makes it practicable to rotate the brush in a direction opposed to the feed of the work and thereby obtain a more effective cleaning action than could be had by rotating the brush in the direction of feed. The buffing roll with its feed roll and the brush with its feed roll are spaced close to render the machine compact, these members being also arranged in such way as to avoid bending the work piece in its passage through the machine.

This and other features of the invention will appear more fully from the following detailed description when read in connection with the accompanying drawing and will be pointed out in the appended claim.

The single figure of the drawing is a sectional view in side elevation showing passage .of a work piece through an illustrative machine.

The operating instrumentalities of the machine herein illustrated comprise a buffing or .abrading roll II] for buffing the tread surface of a sole S, a rotary brush l2 for removing dust from the tread surface of the sole, a feed roll 14 for pressing the sole against the buffing mil 1 l1, and a feed roll it for pressing the sole against the brush it. The buffing roll LU, the brush I2, and the feed rolls i4 and IL6 all have their axes parallel. Cooperating with the feed roll 14 is a throat plate It and cooperating with the feed roll I6 is a throat plate 28. Positioned between the feed rolls it and L6 is a work guide 22 in the form of a rectangular bar having one of its edges beveled to provide a support for the sole between the rolls This guide 22 helps the feed roll 14 to hold a sole, however flexible, against the buffing roll H] by preventing sagging of that portion of the sole which has passed the feed roll. The machine is provided also with a work table 2 3 for the convenience of the operator in presenting soles to the machine. At each end of the table 24 is a guide member 26 to prevent the presentation of work pieces in such a manner as to overlap the ends of the several rotary members above mentioned.

The supporting structure of the machine consists of a frame 28 adapted to rest upon the floor. Each end of the work table 2i is supported by a bracket 29 secured to the frame 28.

The buffing roll Ill may conveniently be a roll of the type disclosed in United States Letters Patent No. 2,218,538, granted October 22, 1940, upon my application. This roll is mounted upon a shaft 36 which is journaled in suitable bearings provided in the frame 28. V

The feed roll I4 consists of a metal core 32 upon which is secured a resilient cushion M which may be composed of rubber or like material and the roll I6 is constructed in the same manner. This feed roll I4 is mounted upon a shaft 36 journaled in hearings on the forward end of a U-shaped carrier bracket 38 which consists of a pair of parallel arms extending forwardly and rearwardly of the machine and connected by integral cross pieces .39. The rear end of the carrier .38 is pivotally mounted upon fulcrum pins 40 for heightwise swinging movement about an axis parallel to that of the feed roll M. Each of the pins 41) is secured in a block 42 which is clamped to the under surface of a horizontal portion of the frame 28 by a screw M passing down through an over-size hole (to permit accurate adjustment) in the frame and threaded into the block. The guide 2.2 is secured at its end portions to the carrier 38.

The throat plate 18 is supported upon a downwardly and rearwardly inclined upper surface of across bar 43 and is slidingly keyed to the cross bar for adjustment in a direction almost tangent to the buffing roll ill. Such tangential adjustment of the throat plate 131s effected by turning an adjusting screw to threaded into the midportion of the cross bar it and having a knurled head .52, the screw 5! having also an integral collar 5.4 which engages .a notch in the throat plate. The throat plate i3 is secured in adjusted position on the cross bar 43 by three clamping screws .55, one of which appears on the drawing. The

cross bar 48 at each of its ends, is bolted to horizontal portions of the frame 28 with. provision for forward and rearward adjustment of the cross bar to determine the clearance between the throat plate I 8 and the bufiing roll I0. The rear and lower edge of the throat plate I8 is beveled to provide a horizontal under surface extending close to the bite of the buffing roll I and the feed roll I4 and engageable with the tread surface (which is uppermost) of the sole S.

Pivotally connected at their upper ends to th carrier 38 adjacent to the ends of the feed roll I4 are a pair of rods 56, the lower end portions of which slide freely through guide holes formed in brackets 58 secured to the frame 28. A coil compression spring 60 surrounding each of the rods 56 has its lower end bearing against its associated bracket 58 and its upper end bearing against a collar 02 which is adjustably secured by a set screw 04 to the rod 56. The springs 60 act upon the carrier 30 to urge the feed roll I4 toward the bllffillg roll 60 and the upward pressure thus derived from these springs holds the sole S against the beveled under surface of the throat plate I8 and also against the buffing roll I0. The throat plate I8 serves not only to enable the feed roll It to control the feed of the sole by holding it back against the tendency of the rapidly rotating bufiing roll to feed it at excessive speed but it also insures the flat presentation of the tread surface of the sole to the buffing roll regardless of transverse irregularities of thickness of the sole. In order to prevent the feed roll 54 from engaging the throat plate I8 of the buffing roll I0 in the absence of a Work piece, there is provided a stop screw 05 threaded through a lu 68 extending from the carrier 38. The upper end of the screw 66 bears against a suitable abutment provided on the frame 28 and the lower end is in the form of a winged head I0 to facilitate turning. A compression spring I2 surrounding the shank of the screw 66 and interposed between the head and the lug 68 holds the screw 66 in adjusted position and prevents undesired turning. In the illustrated machine such a stop screw 66, as above described, is provided on the carrier 38 adjacent to each end of the feed roll M.

The feed roll I0 is similar to the feed roll I4 and is mounted upon a shaft M which is journaled at its ends in bearings on a carrier bracket I6 having its forwardly and rearwardly extending arms connected by an integral cross piece TI. The carrier I6 is pivotally mounted for heightwise swinging movement upon fulcrum pins 78 secured in blocks 80 to enable the feed roll I0 to move toward and from the brush I2, the mounting of the carrier if) being similar to that of the carrier 38. The fulcrum pins I0 are positioned rearwardly of the abrading roll I0 and the brush I2, and the fulcrum pins 00 are positioned rearwardly of the fulcrum pins I8. The throat plate is similar to the throat plate I8 except for the fact that it is supported at each of its ends on brackets I0 secured; with provision for heightwise adjustment, to the frame 28. Pivotally connected at their upper ends to the carrier I0 adjacent to the ends of the feed roll I0 are a pair of rods 32, the lower end portions of which slidably engage suitable holes formed in the brackets 58. Surrounding each of the rods 82 is a coil compression spring 80, the lower end of which bears against the associated bracket 50 and the upper end of which bears against a collar 85 adjustably secured on the rod 82. The springs 84 yieldingly act upon the bracket I6 to urge the roll I6 toward the brush I2 and the throat plate 20. Excessive upward movement of the roll I6, in the absence of the work piece, is prevented by a stop nut 88 threaded upon the lower end portion of the rod 82 and bearing against the under surface of the bracket 58.

As shown in the drawing, the U-shaped bracket 38 extends down from its fulcrum pins 40, then forward beneath the bracket I6 and the feed roll I6, and then up to support the feed roll I4 on substantially the same level as the feed roll I6. embracing the bracket I6 and the feed roll I6 without touchin either of them. The fulcrums of both brackets 38 and I6 are spaced close to each other and are both positioned rearwardly of the locality of operation. Because of its shape and arrangement, the bracket 38 clears the bracket I6 and the feed roll I6 without interference therewith and enables both feed rolls I4 and I6 to approach toward and yield from the bufiing roll I0 and the brush I2 independently of each other. Furthermore, this arrangement of the brackets 38 and I6 not only makes for compactness of the machine structure, but it also enables the feed rolls I4 and I6 to be spaced close enough to each other to insure at least one of them being in engagement with the sole at all times.

The bufling roll I0 and the brush I2 are covered by a suction dust hood 90 having a hinged forward portion which may be raised to provide access to the parts which it normally covers.

An inclined chute 94 is provided for delivering the treated Work pieces to a position convenient for removal by the operator. The forward and lower end of the chute 04 rests upon a bar 96 which is supported by the frame 28. The rear and upper end of the chute 94 is adjustably clamped to the lower end of a pair of bars 98, the upper ends of which are clamped with provision for pivotal adjustment by screws I00 to stationary portions of the frame 28.

The drive of the machine is effected through a countershaft I02 driven by any suitable source of power. A belt I04 running over a pulley on the countershaft I02 drives a pulley I05 having grooves of various diameters. The pulley I05 is journaled upon a stud I06 carried by a bracket I03. A clamping screw IIO secures the bracket I03 to a side wall of the frame 28. The pulley I05, through a belt I I2, drives the bufiing roll I0 at high speed in the direction of feed of the work. It also, through a crossed belt III, drives the brush I2 in a direction opposed to the feed of the work, thereby throwing the raised dust away from the cleaned portion of the work piece. Th directions of rotation of the buffing roll I0 and the brush I2 are indicated by arrows on the drawing.

The countershaft I02 also, through a crossed belt H6 running over suitable pulleys, drives a shaft H3 connected to a set of reduction gears which are contained within a casing I20. These reduction gears, through a sprocket I22 and chain I24, drive a sprocket on the feed roll shaft 30 at a speed considerably below that of the buffing roll I0.

The supporting bracket I08 is provided with a longitudinal slot I28 to permit lengthwise adjustment of the bracket for tightening the belt II 4. This bracket further may be swung pivotally about the clamping screw H0, when the latter has been loosened, to tighten the belt I04. Such pivotal adjustment of the bracket I08 is facilitated by a screw I30 connected at its lower end to the bracket I08 and passing up through a block I32 pivotally mounted upon a bracket I34 secured upon a side wall of the frame 28. A Winged nut I39 on the screw I30 enables the operator to draw the bracket I08 up and thereby to obtain the desired tension in the belt I04.

The feed roll I6 is driven from the shaft 36 in the same direction and at the same speed as the feed roll I 4 by a chain and suitable sprocket wheels (not shown). The direction of rotation of the feed wheels is indicated by arrows on the drawing.

The buffing roll II] of the illustrated machine is preferably reciprocated axially by mechanism similar to that disclosed in United States Letters Patent No. 1,157,725, granted October 26, 1915, upon the application of William A. Reed and James Foley, the reciprocating mechanism of the machine herein shown being operated through a connecting rod I38 driven by an eccentric I 40 on the countershaft I02.

In the operation of the machine, the sole S is placed upon the work table 24 and advanced by hand until the feed roll I4 engages its leading end to feed it past the buffing roll I0 and over the guide 22. The work piece, thus supported by the guide 22, advances in the same plane Without bending or flexing until its leading end is engaged by the feed roll IS. The spacing of the feed rolls I4 and I6 is considerably less than the length of the shortest sole to be treated with the result that from the time the leading end of the sole engages the feed roll M to the time that the trailin end of the sole passes the feed roll I6, the feed of the sole is controlled by one or both of the feed rolls. The space between the buffing roll I0 and the brush I2, while small, is sufficient to permit the oppositely rotating roll and brush to generate a strong up draft which carries up the dust raised by the brush and delivers it into the current of air flowing through the suction hood 90. After the buried and cleaned sole has passed beyond the control of the feed roll I6, it falls upon the chute 94 from which it drops into a suitable receptacle.

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

In a machine for abrading sheet material, a driven abrading roll, a driven feed roll arranged to press a work piece of sheet material against the abrading roll, a swinging bracket on which the feed roll is carried, a pivotal mounting on which the bracket is fulcrumed, spring means acting on the bracket to urge the feed roll toward the abrading roll, a driven rotary brush positioned rearwardly of the abrading roll and arranged to engage a face of the work piece, a second driven feed roll arranged to press the Work piece against the brush, a swinging bracket on which the second-mentioned feed roll is carried,

a pivotal mounting on which the second-mentioned bracket is fulcrumed, and sprin means acting on the second-mentioned bracket to urge the second-mentioned feed roll toward the brush, the second-mentioned pivotal mountin being positioned rearwardly of the brush and the firstmentioned pivotal mounting being positioned rearwardly of the second-mentioned pivotal mounting, and the first-mentioned bracket being U-shaped to enable it to pass under and thereby clear the second-mentioned bracket and the second-mentioned feed roll to insure independent action of the feed rolls.

NORWOOD H. KNOWLTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,168,514 Lane Jan. 18, 1916 1,648,040 Bliss Nov. 8, 1927 1,952,634 Spry Mar. 27, 1934 2,170,901 Jorgensen Aug. 29, 1939 2,295,695 Stacey Sept. 1.5, 1942

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