US2523480A - Method of preparing uppers for lasting - Google Patents

Description

Sept. 26, 1950 J. w. PRATT METHOD OF PREPARING UPPERS FOR LASTING 3 Sheets-Sheet 1 Filed Feb. 26, 1948 Inventor Jbhn WPrcztt 'Att ey Sept. 26, 1950 J. w. PRA'l 'T 2,523,480

METHOD OF PREPARING UPPERS FOR LASTING Filed Feb. 26, 1948 s Sheets-Sheet 2 130 I46 42 L I 3 HA k; 114 16 120/ 412 3 42 34 150126 36' 3 (I 128 E; l

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METHOD OF PREPARING UPPERS FOR LASTING Filed Feb. 26, 1948 3 Sheets-Sheet 3 mm" m 46 Inventor John WPratt Patented Sept. 26, 1950 METHOD OF PREPARING UBPERS FOR LASTING John William Pratt, Leicester, England, assignor to United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey Application February 26, 1948, Serial N 0. 10,976 In Great Britain March 25, 1947 This invention relates to methods of preparing shoe uppers for lasting, the term shoe being used herein as applicable to outer footwear generally.

In the manufacture of shoes having uppers of comparatively'heavy material, such as those used by agricultural workers in which each upper may )include a layer of leather approximately an eighth'of an inch in thickness, it is difficult satisfactori-ly to conform an end portion of the upper, e. g., the toe portion, to the contour of the last and to the margin of an insole on the last. In attempting to last the toe ends of such uppers by the use of amachine of the type'having toe-embracing wipers, such, for example, as the automatic toe-lasting machine shown in United States Letters Patent No. 2,134,148, granted on October 25, 1938, on the application of W. T. B. Roberts, results have not been as satisfactory as desired because of the fact that the stiff and harsh nature of the upper material tends to prevent the marginal portion of the upper from being wiped inwardly over the insole without the formation oflarge unwieldy pleats.

The presence of such pleats makes it necessary, prior to the attachment of an outsole to the shoe, to trim off substantial portions of the margin of the upper over the insole in order that a satisfactorily water-tight joint between the upper and the outsole may be produced, and such extensive trimming necessarily weakens the joint between the upper and the insole. If, on the other hand, the marginal portion of the upper is subjected to a skiving operation to reduce its thickness or to a so-called pinking operation by which V-shaped notches are made in the margin prior to lasting, there is likewise a tendency to weaken the joint between the upper and the insole. It has, therefore, been thecommon practice heretofore to last the toe ends of such shoes by the use of a step-by-steplasting machine. This, however, takes considerably more time than would be necessary if such shoes could be satisfactorily lasted in a machine of the above-mentioned type, and also involves more strain on the operator. I

In view of the above considerations, the present invention provides a method of preparing uppers for lasting in such manner that the toe ends of shoes having comparatively heavy uppers may be satisfactorily lasted by the use of a ma- 1 Claim. (Cl. 12146) chine having toe-embracing wipers without involving any undue weakening of the joint between the margin of the upper and the insole. In the practice of this method in the manner herein illustrated a plurality of slits are formed in the curved margin of the upper around its toe-end portion, preferably before the upper is mounted on a last, the slits extending obliquely through the margin of the upper and terminating on the outer and inner surfaces of the upper (i. e., on the grain and flesh sides respectively of a leather upper) in lines extending inwardly from points on the curved edge of the upper in oblique relation to imaginary lines tangential to the curve of the edge of the upper at those points. Preferably the slits extend at angles of approximately 25 to the outer and inner surfaces of the upper and terminate on those surfaces in lines at angles of approximately '7 0 to the abovementioned imaginary lines. As illustrated also the" slits extend less far inwardly from the edge of the upper on its outer surface than on its inner surface. The slits thus divide the marginal portion of the upper into a plurality of tabs which overlap one another to a substantial extent. It has been found that when the marginal portion of an upper so treated is thereafter wiped inwardly over an insole on a last by the toeembracing wipers of a lasting machine the overlapping tabs thus forrned move relatively to one another lengthwise of the edge of the upper in such manner that the margin of the upper is readily bedded down on the insole by the wipers Without any abrupt variations in its thickness around the end of the shoe bottom. Furthermore, the relation of the tabs to one another and to adjacent portions of the upper is such that tacks driven through them will hold the upper securely in lasted position. Since the slits do not extend so far inwardly from the edge of the upper on its outer surface as on its inner surface, the inner extremities of the slits are amply covered by the outsole for better insurance of a Watertight joint.

The novel method will now be more particularly described with reference to the accompanying drawings and thereafter pointed out in the claim.

In the drawings:

Fig. 1 is a plan view of the toe-end portion of an upper prepared for lasting by the method seesaw above outlined, the upper being shown in a fiat condition before it is mounted on a last;

Fig. 2 is a view in elevation of a portion of the edge of the upper shown in Fig. 1;

Fig. 3 is a plan view of the bottom of the toe end of a shoe of which the upper thus prepared forms a part, illustrating diagrammatically the relation to the shoe of the toe-embracing wipers of the machine shown in the previously mentioned Letters Patent in wiping the margin of the upper inwardly over the insole;

Fig. 4 is a sectional view of the toe end of the shoe after the outsole has been applied;

Fig. 5 is a view partly in left-hand side elevation and partly in section of the upper portion of a machine herein shown for use in practicing the novel method;

Fig. 6 is a view of the upper portion of the machine in front elevation;

Fig. 7 is a detail view, partly in front elevation and partly in section, showing a portion of means in the machine for feeding the upper;

Fig. 8 is a plan view, on an enlarged scale, showing an upper-slitting knife and means for supporting and guiding the upper;

Fig. 9 is a view in front elevation of the portion of the machine shown in Fig. 8;

Fig. 10 is a view in right-hand side elevation of certain parts shown in Figs. 8 and 9; and

Fig. 11 is a section on the line XI2H of Fig. 8.

In the practice of the method in the manner herein illustrated to prepare the toe-end portion of an upper for lasting, a plurality of cuts or slits 2 (Fig. 2) are formed in the curved margin of the upper 3 before the upper is mounted on a last. These slits are preferably formed at evenly spaced intervals about the greater portion of the toe end of the upper, and they extend in planes obliquely through the margin of the upper, preferably at angles of approximately to the outer and inner surfaces of the upper, i. e., the grain side and the flesh side respectively of a leather upper. When the upper materials include a plurality of layers, the slits, in accordance with the procedure herein illustrated, are formed in the comparatively heavy outer layer only, and it is this layer which is commonly herein referred to as the upper. The slits terminate on the outer and inner surfaces of the upper in lines 4 and 6 respectively (Fig. 1), and they preferably extend inwardly from the edge of the upper distances nearly as great as the width of that marginal portion of the upper which is to be lasted inwardly over the insole. They extend, however, less far inwardly on the outer surface of the upper than on the inner surface, as indicated in Fig. 1 by the difference in length of the lines 4 and 6 respectively. The slits are so formed, moreover, that these lines extend inwardly from points on th curved edge of the upper at angles of approximately 70 to lines tangential to the curve of the edge of the upper at those points. The slits may be spaced, for example, about three-eighths of an inch apart, and they thus divide the margin of the upper into a plurality of tabs 8 which overlap one another to a substantial extent and are each substantially rhombic as viewed edgewise, as illustrated in Fig. 2.

It will be understood that after an upper thus prepared has been assembled with an insole on a last, it is commonly subjected first to a pullingover operation. Since the overlapping tabs 8 are comparatively narrow, th toe-end gripper of the pulling-over machine, and possibly also those side grippers which are located comparatively near the end of the toe, will each close on at least two of the tabs and will thus tension the upper satisfactorily without any substantial danger that any of the tabs will be detached from the rest of the upper. Furthermore, the tacks driven by the pulling-over machine to fasten the upper in pulled-over position will commonly pass through two of the tabs, since in presenting the upper to the grippers its margin will be contracted to some extent and the tabs will thus be caused to overlap one another to a greater extent than when the upper is fiat. The upper will therefore be securely fastened by the tacks.

If the toe end of the shoe is thereafter lasted in a machine of the type having toe-embracing wipers, such as the automatic machine shown in the previously mentioned Letters Patent, the wipers in (Fig. 3) will wipe the marginal portion of the upper inwardly over the insole without encountering any undue resistance and without forming any large or unwieldy pleats in the upper, i. e., without causing any abrupt variations in thickness along its margin. This is because the tabs 8 will slide evenly over one another as the length of the marginal edge of the upper is decreased. Contributing substantially to these desirable results is the particular angular relation of the slits 2 to the outer and inner surfaces of the upper and to the edge of the upper, as hereinbefore described. It has been found, for example, that much better results are thus obtained than would be the case if the slits were so formed that the lines 4 and '6 at the termination of the slits on the outer and inner surfaces of the upper were perpendicular to lines tangential to the curve of the edge of the upper at the outer ends of such terminal lines. A further substantial advantage arising from the fact that the slits extend inwardly from the edge of the upper less far on the outer surface of the upper than on its inner surface is that the points where the slits terminate on the outer surface are far enough inwardly from the edge of the last bottom to be amply covered by the outsole, which contributes to the formation of a watertight joint between the outsole and the upper. This is illustrated in Fig. 4, where the outsol is shown at I2 and the limit of one of the slits in the upper is indicated by the line M.

The machine shown in the previously mentioned Letters Patent is provided with means for driving a plurality of tacks through the margin of the toe end of the upper to secure the upper in lasted position. In view of the relation of the overlapping tabs 8 to one another after the wipers have wiped them inwardly over the insole, each tack will be driven through at least two of the tabs. For this reason, and in view of the further fact that no material is removed from the upper in the formation of the slits, no substantial weakening of the joint between the upper and the insole results from the presence of the slits in the upper. Since, moreover, the margin of the upper prepared as described is lasted evenly over the insole without the formation of any substantial pleats or other abrupt variations in its thickness, but little, if any, trimming there- Of is required to prepare it for the reception of the outsole.

While the upper may be prepared for lasting in accordance with the above-described method by the use of any suitable means, a machine which may be used for this purpose is shown in Figs.

clutch. 2d. of any suitable type, preferably one which willcause the machine to operate continuously as long as a clutch-actuating treadle 2B is helddepressed against the resistance of'a spring 2?. Rotatably mounted: in the head casting i6 is another shaft '28 -driven by the shaft 2!; athalf the speed of the latter through suitable gearing 30. Fixed on. the shaft -28 is an eccentric 32 which, througha rod 3 1, controls .aclutch-tripping lever 36. operated as hereinafter. described by the treadle 26 to start the machine, the lever 36 being arranged to trip the clutch through means ineluding a. rod 38. The lower end of the rod 3.4 is seatedv in a socket in the lever 36, and when the treadle 26. is released by the operator the rod prevents thelever 36.- from moving upwardly to cause the machine to come to a stop except as permitted by the eccentric 32, the arrangement therefore being such that the cam shaft 26] will come to a. stop only in a predetermined position.

The machine is further provided with a circular work-supporting table to rotatable about a vertical axis, a feed wheel t? arranged to cooperate with the table, when the latter has been raised as hereinafter described from a lowered inoperative position to an operative position, to feed the marginal portion of an upper gripped betweenthe table and the feed wheel, and aflat arcuate upper-slitting knife M, movable in a plane and arranged to cooperate with a shear block A6. to form the. slits in the margin of the upper. The upper is guided in its feeding movements by the shear block and by twoedge gages- &8 and 56 (Fig. 8 these parts cooperating to position the upper in such relation to the path of movement of the knife as'to' cause the latter to form the slits in the desired relation to the upper, as more particularly hereinafter described.-

The work-supporting table it is fast on the upper end of a vertical shaftSZ extending down- The machine includes a head 6 the lever and a lug on the head casting lfi' holds thefroll 68 at all times in engagement with the cam I0, the springacti-ng on the lever in a location farther re'arwardly than the roll. When the treadle is depressed, therefore, the front end of the lever first is swung upwardly by the cam Ill and the work table m is thus raised to clamp the upper between it and the feed wheel Q2. The arm 74 has projecting la-te'rally'from it a stud-80 which extends through the slotted lower end of an upwardly extending link 82 connected at its upper treadle as above described to clamp the-"upper before the clutch is tripped, after which further movement of the treadle serves to trip the clutch. In response to this further movement ofthe treadle the cam l6 swings the rear end of the lever 64 upwardly about the connection between the lever and the collar 62. The lever has formed on its rear end a series of ratchet teeth 84 arranged to be engaged. by a pawl 86 pivotally mounted on an arm 88 whichis fast on a horizontal shaft 90 in the head casting. The pawl has thereon an arm 92 connected by a rod 9 3 to the clutch-tripping lever 36, a spring 96 being interposed between the arm and a shoulder on the rod, so that as the clutch-tripping lever isswung downwardly to trip the clutch the pawl 86 is swung into engagement with the ratchet teeth 84 and heldyieldingly against the teeth. The

wardly through a sleeve 54 to which it is keyed" in such manner as to' rotate therewith but to permit it to bemoved upward relatively to the sleeve. The sleeve is rotatably mounted in a lug 56 on the head casting I6, and below this lug the shaft is mounted for rotary and vertical movements in another lug 58 on the head casting, Immediately below the lug 56 the sleeve 54 has secured to it a spiral gear 6%] the upper face of which engages the lower face of the lug to prevent any upward movement of the sleeve. Downward movement of the sleeve is prevented by engagement of a shoulder thereon with the upper face of the lug 56. Below the sleeve 54 the shaft is reduced in diameter and has thereon a shoulder supported by a collar 62 in which the shaft is free to turn. This collar is pivotally connected to the bifurcated front end of a rearwardly extending floating lever 64 the rear end portion of which is arranged normally to rest on the upper end of a vertical screw 66 threaded in the head casting. screw and the front end of the lever a roll 58 is mounted on the lever and is engaged bya segmental cam member ID fast on a shaft l2. Fast on the left-hand end of this shaft is an arm M connected by a link E6 to the treadle 26. A com- Substantially midway between this pression spring it confined betweenthe top of arm 88, moreover, is controlled by a spring 98 which tendsto swing it downwardly, its down ward movement being limited by a screw mnwhich is threaded in the arm and engages a face on the head casting; The construction is accordingly such that-after the upper has been clamped between the work table and the feed wheel by the action of the cam 19, the further movement of the treadle, whereby the clutchtripping lever 36 is swung downwardly, first causes the pawl 86 to engage the teeth 84 on the rear end of the lever 64', after which the continued movement of the cam 1!] as the treadle is further depressed causes the lever 8 to swing upwardly aboutits connection with the collar 32, not only against the resistance of the spring 78,

but also against the resistance of the spring 98 Which opposes the upward movement of the arm 88. through the pawl 86 to swing the arm 88 upwardly against the resistance of the spring 98. This causes the upper to be clamped yieldingly and still more firmly between the work table and the feed wheel.

The feed wheel 42, which is serrated to prevent it from slipping on the upper, is fixed on the front end of a rearwardly and downwardly inclined shaft I02 which has fast on its rear end aratchel wheel HM (Fig. '7'). This ratchet wheel is operated by a spring-pressed pawl we carried by an arm I B8 which is pivotally mounted on the shaft I02 and is oscillated through a link i ii! by a bell-crank lever H2 (Fig. 6) mounted on a,

shaft lit in the casing i8, this lever being pro-' A shield I22 rotatably mounted on the shaft I02" is adjustable by a setscrew 121 to determine" variably the time when the pawl H36 engages the ratchet wheel Hi l and thus to determine the amount of upper-feeding movement imparted to the feed wheel 42. The feed-wheel shaft I62 has That is, the rear end of the lever 64 acts fast thereon a bevel-gear I26 in engagement with a bevel-gear I28 fast on an inclined shaft I30 which carries a spiral gear I32 inengagement with the previously mentioned gear-60 on the sleeve 54. Accordingly, the work table 40 is turned simultaneously with the feed wheel 42 by the pawl-and-ratchet mechanism shown in Fig. '7.

The upper-slitting knife 44 is fast on the front end of a lever I34 secured to the upper end of a vertical shaft I36 which is mounted to rotate in bearings I38 and I40 (Fig. 6) formed on the head casting I6. The shaft I36 is adjustable vertically by means of a screw I42 threaded in a lug I44 on the head casting and located beneath the lower end of the shaft. The shaft is held in engagement with the screw by a spring I46 which extends around the shaft and is confined between the upper bearing I38 and a, pin I48 in the shaft. The rear end of the lever I34 is connected by a link I50 to the lower end of a lever I52 mounted between its ends to swing about the previously mentioned shaft H4. The upper arm of this lever carries a roll I54 which lies in a cam groove I56 formed in the previously mentioned cam I I8. The link I50 is connected to the lever I34 and the lever I52 by ball-and-socket joints to permit the link to have the necessary lateral play in the swinging of the lever I34.

The previously mentioned shear block 46 extends partially over the work table 40 at the right of the feed wheel 42 and is secured to a member I51 fast on the head casting I6. It is provided with a lower horizontal surface I58 (Fig. 11) and with an upper-guiding slot I60 downwardly inclined from right to left. Extending downwardly into this slot near its left-hand lower end are two short projections I62 (Figs. 9 and 11) for a purpose hereinafter described. The slot I60 opens into the front face, the righthand face and the lower horizontal face of the shear block. The edge I64 (Figs. 8 and 11) formed by the intersection of the upper surface of the slot and the lower horizontal surface of the block serves as a shearing edge with which the knife 44 cooperates to form the slits in the upper, as illustrated in Fig. 11, and in order that this shearing edge will be approximately parallel to the edge of the knife when the knife acts on the upper the slot I60 is also downwardly inclined in a rearward direction. The downward inclination of the slot I60 from right to left is such that the slits formed by the knife are at angles of approximately 25 to the outer and inner surfaces of the upper. It will be understood that when the curved toe end of the upper is positioned in the slot I60 and between the feed wheel and the work-supporting table its curved edge is in engagement with the two edge gages 48 and 50, as illustrated in Fig. 8. The edge gage 48 is positioned at the left-hand side of the shear block 46 below the feed wheel 42 and extends upward partially around the feed wheel, as shown in Fig. 9, and it is adjustable in forward and rearward directions. The edge gage 50, which engages the upper at the right-hand side of the shear block, is secured by a screw I66 to the upper face of the member I57, the screw extending through a slot I68 in the gage to permit the latter also to be adjusted in forward and rearward directions. A portion of this gage extends downwardly across the right-hand end of the slot I60. The two edge gages, when properly adjusted, cooperate to position the upper In such relation to the shearing edge I64 that the lines in which the slits formed in the upper terminate on the outer and inner surfaces of the upper form angles of approximately 70 with lines tangential to the curve of the edge of the upper at the outer extremities of the firstmentioned lines. With the upper thus positioned, moreover, the slits formed by the knife extend farther inwardly from the edge of the upper on its inner or flesh surface than on its outer or grain surface, its grain surface being uppermost in the machine. The previously mentioned projections I62 in the slot I60 of the shear block, which are located near the shearing edge I64, serve by engagement with the upper to insure that it will not slip in the slot in the direction of its feeding movement by reason of the force applied thereto by the knife 44 in forming the slits.

In the use of the above-described machine the operator presents the toe end of an upper grain side uppermost with a portion of its margin in the slot I60 of the shear block 46 and another portion under the feed wheel 42, the upper being in such relation to the shearing edge I64 of the shear block that the knife will form the first slit therein at the left-hand side of the toe. As the upper is thus presented its edge is engaged by the two gage members 48 and 50 which have been properly adjusted to determine the depth of the slits and the directions in which they will extend inwardly from the edge of the upper. The operator thereafter depresses the treadle 26 to raise the table 40 and thus to clamp the upper yieldingly between the table and the feed wheel, as hereinbefore described. Further depression of the treadle serves to trip the clutch and thus to start the operation of the machine. Upon the starting of the machine the knife is first operated to form a slit in the upper and.

then returns to its initial position, after which the feed wheel 42 and the table 40 are rotated by the pawl-and-ratchet mechanism shown in Fig. 7 to advance the margin of the upper into position for the knife to form the next slit therein, the amount of this advancing movement, which may be about three-eights of an inch, being determined by the adjustment of the pawlcontrolling shield I22 (Fig. 7). As the upper is thus fed the operator controls it in such manner as to maintain its edge against the gage members 48 and 50. The machine continues thus to operate on the upper as long as the operator holds the treadle depressed. When he releases the treadle, it is returned by the spring 27, thus causing the machine to come to a stop and the work table to be lowered to release the upper, the eccentric 32 and the rod 34 controlling the clutch-tripping lever 36 in such manner that when the machine comes to a stop the knife 44 is in its initial position.

Novel features of the above-described machine are claimed in a divisional application Serial No. 73,595, filed on January 29, 1949.

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

That improvement in methods of preparing uppers for lasting which consists in forming in the curved margin of the toe-end portion of an upper prior to the toe-lastin operation a plurality of slits extending obliquely through said margin and terminating on the outer and inner surfaces of the upper in lines extending less far inwardly from the edge of the upper on its outer surface than on its inner surface and in oblique 9 relation to imaginary lines tangential to the curve of the edge of the upper at the outer extremities of said first-named lines.

JOHN WILLIAM PRATT.

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

UNITED STATES PATENTS Name Date Number Copeland Oct. 27, 1885 Number Number

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