US1991458A - Machine for use in manufacturing shoes - Google Patents

Description

Feb.19 1935. H. HALLAM 1,991,458

MACHINE FOR USE IN MANUFACTURING SHOES Filed April 21, 1952 Fig.1

r 41 I i i M L- '33 1; 7 I I Luna, firing. 3

Patented Feb. 19, 1935 STAES PATENT OFFICE Claims; (01. 51-439) Thisinvention relates to machines for use in manufacturing'shoes and'is herein disclosed as embodied in a machinefor grinding, to a desired fthe heel end to its heel seat portion, to bevel the marginal portion around the lower edge of the insole at suchan angle that the curve of the back of the last and the contour of the edge of the ina sole are more or less continuous. w Ordinaryleather insoles are usually trimmed to a desired bevel by a rotary cutting tool. In the case of a rein- V forced insole the beveling operation often takes place principally upon the layer of reinforcing material, since the latter is secured to thatv side of the insole which is further fromthe last bottom and may be of material thicker than that of the remainder of the insole. When the reinforcing material is relatively stiff and hard as-compared with leather, as is usually the case, it is found that trimming cutters which are capable with objectionable frequency.

Itis, accordingly, an object of the present in-- vention to avoid this difficulty. As herein disclosed this is done by the provision of an improved abrading machine well adapted to use for grinding the edges of sheet material such as soles and like articles to the desired beveled form.

r In accordance with a feature of the invention.

a Work guide, which extends substantially parallel to the axis of a rotary abrading tool, i's'provided for engaging a face of a piece of sheet materialfor determining the angular relation of the material to the operating surface of the abrading tool'and a gage is positioned between the work guide'and the operating surface of the tool for engaging an edge portion of the sheet material for limiting the movement of the material toward the abrading tool thereby to limit the amount of material which can be removed from the edge. In the illustrated machine the abrading tool is in the form 1 Wheel having a peripheral grindshoe at the heel endmay presents. smOothcon- H ti'nuous curve from the upper edge of the shoeat' ing surface, and supporting means is provided for the work guide constructed and arranged for adjustment 'to' vary the'angular relation between the article tobeabraded and the operating surface of, the grinding wheel. The edge engaging member for limiting the amount of material which can be abraded-from the workpiece consists of a thin blade-like member extending toward the abrading. tool and terminating in an edge which is closely adjacent to the operating surface of the abrading tool. I 1

These and other features of the invention will be describedf'as embodied in' an illustrated machine and pointed out in the appended claims.

Referring now to the accompanying drawing, Fig. 1 is a view in front elevation showing the head of the machine and 1 V a Fig. 2 is aviewinside elevation of thefparts seen in Fig. 1 looking from the, left. f 4

The frame of the illustrated machine comprises a vertical column 1 havinga; head casting 3 at its upperendin which is supported ahorizontal shaft 5 extending from left to right of the oper ator as he stands in front of the machine. The;

horizontal shaft is provided with fixed and idler belt'6 in a counterclockwise direction as. viewed neighborhood of two thousand five hundred revolutions' per minute. A grinding wheel 7 is secured to theleft hand end of the shaft tobe rotated thereby and is preferably about 7 in diameter by 3%" wide;

This grindinglwheel is preferably of relativelysoft composition and may conveniently be a wheel manufactured by the Waltham Grinding'Wheel Company of' America having a softness identified by that company as of the grade 46H. 7 The wheel '7, regarded'as a trimming tool will have a path of action which coincideswith its operating surface, i. e. its periphery. A bracket 9 issecured to'the machine head andxextends close to the grinding wheel 7 and has bolted to it a-circular dust collecting hood l1 enclosing the wheel 7. The hood 11 has an outlet openingin its rear portion, from. which. outlet openingfa suction conduit 87 extends downwardly. The suction conduit 87 is connected to the usual exhaust blower (not shown) for disposing of dust which arises from the operation of the wheel '7 upon the work.

A short stationary sleeve Shaft 5 jisilocated between the right hand side of in Fig. 2 and atia highspeed preferably 'in the 13 surrounding the :guideway 37 by a clamping bolt 40. block 39 has a depending curved member 41 sethe dust collecting hood 11 and the left hand end of the head 3 of the machine and is rigidly secured to the latter by a collar 15 which is screwed to the head. A short bracket 17 is adjustably clamped on the sleeve 13 close to the dust collecting hood 11 and extends upwardly and forwardly from the sleeve. This bracket 17 has a guide rib 19 formed on it which extends forwardly and rearwardly of the operator and is inclined slightly downwards towards him. A carrier member 21 is mounted for adjustment along this guide rib and has a slot '23 formed in it through which passes a clamping bolt 25 engaging a threaded hole in the bracket .17. Thebracket also has a threaded hole 27.for'med through it parallel to the said guide rib and just below it. A threaded stem 29 having ahand wheel 31at its rear end passes through the miss apen 21am carries collars 33 spaced apart near its front end which are secured to the threaded stem and receive between thema downwardlyextending lug 35 formed upon the carrier member 21 just rearwardof itsforwardend The forward end of the formed in its left hand face in whichis secured a block 39 carrying a pair of work engaging members. Theblock 39 may be clamped in any desired position of adjustment along the arcuate The said cured to it which member is bifurcatedto straddle the grinding wheel and is curved downwardly and forwardlyat its lowerend. To the extreme forward end of this portion is secured a work-sup portingtable 4 3 which,ismounted on a horizontal pivot' e.5 extending parallel to the shaft 5 of the machine. This work table is relatively small beingaboutl fl in'length and in breadth and is urged in a forward .and .upward direction by a spring 4 7 whichfis located in a housing in the ,c'furv'ed .member 511 and bears against the underside ofthe table, faces on the forv'vardend of the curvedmemberjll' andon a portion of the table surrounding the pivot 45 limiting the upward movement "oflthe Ltable. The depending 1 member 41 arranged to be adjusted bodily forwardly and rearwardly of the machine by means herein.- aftei" described vuntil the rear edge of the work table 43 lies close "to the edge of the grinding wheel 7. The curved depending member. 41 has alguideway 49 formed in'itwhich is located above the work supporting table 13 and extends down- "wardly andrearwardly at rightangles tothe gen- .eralplane of the latter. A work positioning foot 151' (abouthalf an inch wide) is located with freedom for adjustment in the said guide and has a plainunderface which is arranged to lie parallel to the axis of the wheel 7 and to the general plane of thework table 43 whenlthe latter is depressed somewhat against the action of the spring 47 and 1 fofth'e blade-like member projects a small extent (preferably 3 Qr thereabouts) beyond the lower face of the work positioning member and lies almost in contact'with the periphery of the grinding'wheel. The lowerend of this blade-like I nember is'reduced in thickness to a knife edge so whole thickness of the. insole (excluding that small portion shielded by the projecting portion of the blade-like member) will be operated upon by the grinding wheel.

The work table 43 and positioning foot 51 are so located vertically of the wheel that an insole supported on the side which is not reinforced by the work table and engaged on its upper reinforced side by the foot will be presented to the ,periphery of the grinding wheel about 1 below the axis ofthe grinding wheel. When the table lies at an angle of about 45 to the horizontal with the insole positioned between the table and the foot the insole will lie in a plane which'is tilted downwardly about twenty-two degrees from a radial line drawn to the edge of the grinding wheel near the lower end of the blade- .l'ike member 53, and the action of the grinding wheel on the insole will produce on the edge of the latter a bevel extending at about 22 to a line drawn perpendicularly to the reinforced iace of the insole the said bevel extending from the lower face of the insole almost, but not. quite, to its upper face. By adjusting the block 39 aforesaid along the curved guideway 37 the angle at which I the work table lies relatively to the horizontal .can be varied. This curved guideway is concentric about the lower end of the blade-like member 53 when the latter projects about 5 below the lower face of thework positioning foot, so that.

movement of the block along the guideway will not disturb the closeness of the foot to the periphery of the grinding wheel. The angle through which the curved guideway 37 extends is such that by moving the block along the curved guideway the angle of bevel produced on the insole may be varied between limits of 11 to a line drawn perpendicularly to the reinforced face of the insole and 31 to that line.

As the grinding wheel 7 wears away the work table l3 the foot 51 may be keptclose up against the periphery of the latter by rotating the threaded stem 29 aforesaid. to cause the work'table and the work positioning foot to move bodily towards the grinding wheel along a path parallel to the axis of the threaded stem' 29.

In the normal operation of the machine, the operator stands infront of the machine as seen in Fig. 1 and inserts a reinforcedinsole I with the reinforced side Rdownwards, between the springsupported work supporting table 43 and the work positioning foot 51 which will thereupon cooperate to grip the in ole lightly between them. The operator then moves the insole between the table and the work-engagingfoot so that the toeward end of the reinforcing material at one side of the waist of the insole is opposite the periphery of the grinding wheel. He then pushes the insole rearwardly towards the periphery of the wheel until the insole contacts with the lower end of the blade-like member 53. The grinding wheel will then commence to bevel oh" the lower edge of the insole and reinforcing layer at the desired angle and the operator then gradually moves the insole endwise along between the work table and positioning foot, while still urging the insole against the wheel, to cause the beveling operation to proceed towards the heel end of the insole. When he reaches the heel end, he swings the insole gradually around through about one hundred and eighty degrees while still maintaining the insole pressed against the wheel, thus causing the bevelling operation to be carried out around the heel end of the insole. After the bevoiling operadon has been efiected around the heel endthe operator moves theinsole lengthwise once more-in the oppositedirectionto that in wh-ieh he previously moved it and thus causes the beVelli-ng operation to be continued along the remaining side of the insoleuntil it has completely-bevelled thereinforced portion of the insole.

In order to prevent the surface of the grinding wheel from becoming glazed'by its grinding action on insoles a dressing wheel 55 is provided which can be lowered into contact with the periphery ofthe wheel and serves by pressing on the latter to keep its surface rough. This dressing wheel 55; comprises a number of corrugated steel discs mounted side by side ona pin 57 whichi's secured in the rear'end of a rocker arm 59 which is housed inside the dust hood 11 and is secured at its forward end to a freely rotatable shaft or pivot 61 which extends through the left hand side of the dust hood surrounding the wheel. A spring 63 is secured at one end to the arm 59 which carries the dressing wheel and at the other end to a hook on the dust hood and tends to pull the dressing wheel down on to the periphery-of the grinding wheel. A hand lever 65 is freely mounted on the pivot 61 for the arm 59 on the outside of the dust hood and has a pin 67 se- 1 cured to it close to the pivot which pin extends towards the left. A cap member 69 is secured'to the extreme left hand end of the pivot 61 and has an arcuate slot '71 formed in it into which slot extends the pin 67 secured to the hand lever 65. A spring '73, which is stronger than the spring 63 which is connected to the arm 59 carrying the dressing wheel, is secured to the hand lever 65 and tends to pull the latter rearwardly so that the pin 67 secured to the hand lever presses against the rearward end of. the slot '71 formed in the cap member ,69 and thus lifts thelink 59 carrying the dressing wheel away from the grinding wheel. By pulling the hand lever 65 forwardly against the action of the spring 73 the pin 67 can 1 be retracted from the rearward end of theslot 71, thereby enabling the spring 7 3 to press the dressing tool against the grinding wheel; It will be noted that the pressure of the dressing tool against the grinding wheel is not derived from the lever 65 but from the spring 63 and is accordingly predetermined. If, however, a greater pressure is desired, the operator can pull the' carries the pivot filfor the link 59 is formed as a door 77 which is secured to the dust hood on a vertical pivot pin 79 near to its rear side. A thumb screw 81 normally holds the door 77 clamped in closed position but by release of the thumb screw the door can be swung open and the grinding wheel can be easily seen and reached. Furthermore when the door is open the dressing tool and its associated mechanism are also accessible.

The above-described dressing tool, together with its operating mechanism, is not claimed herein, but constitutes the subject-matter of my copending application Serial No. 728,146, filed May 29, 1934, which is a division of the presentvv application.

In order to prevent excessive accumulation of leather dust in the bottom of the dust hood from fouling the grinding wheela pocket 82 having an opening- 83 is formed inthe dust hoodbelow the axis of the grinding wheel which openingis connected by a pipe85 to the air exhausting duct S'T'which communicates with the hood 11 itself.

A butterfly valve 89 is located in the pipe 85 just below the bottom of-the dust hood and, under the'influence of .a spring 91, normally closes the pipe andformsa wall against 'whichthe' leather dust canaccumulate. The operator can however when he so desires open the butterfly valve and. allow the air suction to draw away the leather dust. I

Byadjusting the bracket 17 around the sleeve ing foot can be raisedor lowered around the peripheryofthe wheel to give the most convenient working position for the operator.

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

1. A machine for beveling the edges of soles and like articles comprising an abrading tool having a peripheraloperating. surface, a work guide engageable with a face of a sole for determining the angular relation of the sole with respect to the periphery of said abrading tool, means for limiting the approach of thesole toward the peripheryof said tool thereby to limit the amount of materialwhich can be abraded from the edge of the'sole, and supporting means for said work guide'constructed and arranged for adjustment to vary the. angular relation between the sole and the operating'surface of said abrading tool'while maintaining substantially constant the relation between saidapproachlimiting means and said abrading tool.

2. A machine'for abrading the edges of soles and like articles comprising a rotary abrading tool, a work guide having'an operating surface substantially parallel to the; axis of said abrading tool and extending closeto the operating surface. r

of said abrading tool and engageable witha face of a sole for positioning the sole in a desired relation to the operating surface of said tool, and a gage positioned between'said work guide and the operating surface of said tool for'engagi'ng a portion of the edge of the sole to limit the amount of material which can be abraded from the sole.

. 3. A machine for abrading the edges of soles and like articlescomprising a rotary abrading 'tool, a work guide having an operating surface substantially parallel to the axis of said abrading tool and extending close to the operating surface of said abrading tool and engageable with a face of a sole for positioning the sole in a 'desired relation to the operating surface of said tool, and a gage in the form of a thinblade-like member positioned between said work guide and the operating surface of said tool for engaging a portion of the edge of the sole to limit the amount of material which-can be abraded from the sole,

saidgage extending toward the abrading tool and terminating in an edge which is closely adja-- cent to the operating surface of the abrading tool.

4. A machine for abrading the edges of soles and like articles comprising an abrading tool, a

work guide engageable with a face of a sole to be abraded for determining the angular position -material which can be abraded from the sole,

said gage terminating in an edge which is closely adjacent to the operating surface of said abrading tool, and a support for said work guide and said gage constructed and arranged to enable said work guide to be adjusted angularly in relation to the abrading surface of said tool-about an axis which coincides substantially with said terminating edge of said gage thereby enabling such adjustment to be effected Without varying the position of the terminating edge of said gage relatively to the operating surface of said abrading tool. a

5. A machine for abrading the edges of soles and like articles comprising an abrading wheel having a cylindrical operating surface, a work guide engageable with a face of a sole to be abraded for determining the angular relation of the sole with respect to the operating surface of said abrading tool, means for limiting the approach of the edge of the sole toward said abrading tool to limit the amount of material which can be abraded therefrom, and supporting means for said work guide and said work gage constructed and arranged for adjustment about the axis of said abrading tool whereby the position of said work guide and said gage can be varied for the convenience of the operator without altering the angular position of presentation of the sole in relation to the operating surface of said tool.

HARRY HALLAM. 15

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