US2409447A - Relasting machine - Google Patents

Description

5 Sheets-Sheet 2 Oct 15, 1946. A. PERRI 7 2,409,447

RE-YLASTING MACHINE Filed Jan. 13, 19,45 5, Sheets-Sheet 3- INVENTOR. 4 M

Patented Oct. 15, 1946 RELASTING MACHINE Angelo Perri, Groveland, Mass, assignor to Allied Shoe Machinery Corn, Haverhill, Mass, a corporation of Massachusetts Application January 13, 1945, Serial No. 572,620

11 Claims.

This invention relates to mechanism for inserting lasts in shoes. More particularly it relates to a machine for inserting a last in a shoe which previously has been lasted and which has been removed from the last on which it was lasted.

Frequently it is necessary or desirable to remove from its last a shoe in process of manufacture after its upper has been lasted andsubsequently to re-insert a last therein preparatory to performing some later operation thereon, such as applying the heel, for example. Although conventional lasts have their fore and aft sections hinged together so that a last may be broken at its hinge to facilitate its insertion in and removal from a shoe, it is difficult to re-insert a last in a previously lasted shoe because the lasting operation necessarily conforms the shoe upper preciselyv to the last curvatures and, having removed the last, its re-insertion involves forcing it into a cavity which, due to some resiliency in the lasted upper material, usually is smaller than the last. In any event the fit is so tight that considerable force is required; to get a last back into a shoe subsequent to a removal of the last upon which the shoe initially was formed.

It is an object of my present invention to provide mechanism for quickly and effectively reinserting a last in an alreadylasted shoe. I provide a low cost treadle operated press in which a plunger is spring-actuated in response to depressing of a treadle to forcibly engage the rear portion of a lasted shoewhose forepart has been placed on a last while the latter is broken at its hinge. The last is unyieldingly supported in the past of the plunger, and the stroke of the plunger forces the rear portion of the shoe over the last and simultaneously snaps the last to its extended condition. l

Another object is to provide means for resetting the plunger againstthe resilience of its actuating springs. According to the invention, depression of a treadle after a shoe has been relasted elevates the last with the shoe thereon to force the plunger upward until a latch engages and maintains the plunger in elevated set condition ready for another re-lasting work stroke.

Afurther feature resides in the pr ovision of a shoe horn facilitating movementofthe rear portion of'a shoe onto a last in response to a stroke of the plunger, and the shoe horn conveniently is withdrawn from the re-lasted shoe during the operation of re-setting the plungerw Still another object is to provide for re-lasting shoes having only a strap extending around the rear part of the upper. A notched strap-engag- Figure 8 is a perspective of the bell cranklever ing member is removably, and yieldingly carried on the plunger for forcing the strap over the last as the plunger descends, the strap-engaging member conveniently and effectively being supported between coacting springs of the plunger.

It is, moreover, my purpose and object generally to improve upon prior re-lasting machines and mechanisms.

In the accompanyingv drawings:

Figure 1 is a top plan view of a re-lasting" machine embodying features of my invention;

Figure 2 is an elevationof the upper part of v the machine of Figure 1, looking in the direction of the arrows on line 2-2 of Figure 1;

Figure 3 is a cross-sectional view of the lower part of the machine of Figure 1, online 3-3 of Figure 1;

Figure 4 is a fragmentary elevation illustrate ing the plunger after it has descended into engagement with a shoe, and showingthe last extended and the shoe re-lasted; f v

Figure 5 is a view similarto Figure 4 but with the last. elevated to reset the plunger;

Figure 6 is a fragmentaryelevation showing a strap type upper re-lasted with the aid of adepending strap-engaging member which is shown in dotted outline in Figure 2;

Figure '7 is a rear face view of the shoe horn and its supporting levers; and

for operating the latch releasing plate.

Referring to the drawings, the embodiment of my invention astherein represented,- has a base.

Hi from which rises the vertical hollow standard l2.

veniently may have securedthereto in any suit-. able manner the Work table sections 14.

A last supporting shaft 16 extends vertically and slidably within standard 12 and upward through plate l3 to a substantial height above the work table, its upper end being reduced as at I8 for engaging in the usual socket of a last. 20,

for mounting the last on the shaft l6. The lower end of shaft-IE is connected by link 22 to bearing portion 34, through which the shaft l5 Carried at the upper end ofstandard I 2 is the horizontally disposed p1ate. l3' which conslidably extends, and the vertically aligned upper bearing portion 36 wherein is slidably mounted the plunger shaft 38 having the head 40 secured to its lower end. Shaft 38 has a keyway 42 therein in which set screw 44 in bearing portion 36 engages, to prevent rotation of the shaft while permitting vertical movements: thereof. Acollar 46 is slidably keyed on plunger shaft 38 with a relatively heavy coil spring 48 on the shaft and engaging between the fixed bearing portion 36 of yoke 32 and the upper side of collar 46. A relatively weaker coil spring 56 on shaft 33 engages between the lower side of collar 46 and the plunger head 46.

The upper end of plunger shaft 38 has adjustably threaded thereon a finger nut 52 which may be adjusted along the threadedupper end of plunger shaft 38 to vary the stroke of the plunger which normally is held elevated by the latch lever 54. As represented,.the latch lever 54 is pivotally suspend'ed'from a collar 56 which is in turn suspended'from the finger nut 52 by means of hook elements58 loosely engaging ingroove 60 of' the finger nut. Collar 56 is slidably engaged around shaft 38 and is held against'rotation thereon We set screw 62 engaging in keyway 42'oftheshaft. Fig. 2 shows latch 54' engaged with the bearing portion 36 and acting as a strut maintaining plunger 38, 46. inelevated position against the resiliency'of'both springs*48,,56. Whenthe latch is disengaged, by means to be described, the plungeris snapped downward into forcible engagement' with a shoe on last 26, as shown in Fig. 4.,

The means fordisengaginglatch 54 comprises a forked plate 64 whose forked end rests on the top of bearing portion 36 of yoke 32, straddling shaft 38,v and whose other; end is pivotally-connected at 66 to. the long arm 68' of bell crank lever I which is pivotally mounted at "I2 on yoke 32.

under which engages'the upper end of an actuating.arm.'IB which is carried on the actuating, shaft 80. whose lower" end is connected to a second treadle'lever 82 pivotallymounted' at a mid-location alongit at the pivot-26. The-forwardlyprojecting-pedal part 83 of this treadle is elevated a little above the pedal 25 asshown in Fig. 3', and overlies it a little shown in Fig; 1.

Referring to Fig. 2; it will be seen that the actuating-arm 18" is indirectlysupported on actuating shaft 80' by being-pivotally mounted" at 84 onone. of a spaced pair oflinks' 86, 88 which are pivotallyconnected at 90, 92 to the headpiece 94 on the upper end of actuating shaft 86. A

short link 96 connects the upper ends of theselinks and has 'a lower edge 98*for engaging from abovethe pin 161 which projects between the spaced links 8638' and which is engaged from below by the upper end of actuatingarm 18' as previouslydescribed. The pivoted lower end of thegactuating arm has a projecting foot I06 thereon; and; head: piece-64 has the chambered boss I02 for-seating one end'of'a coil'spring I64'whose otherend' bears against foot" I00 tendingto rotate actuating arm I8, clockwise and thus tending tomaintain its upper end, which has slightlyinclined curvature as'at I9, pressed against pin I61 A setscrewrIOG permits adjustment of the tension ofspring I64; This link construction at the upper endof actuating shaft 80 provides flexibility in its connection with pin I6.

It will be obvious-that, with the construction shown and described; an upward movement of The shorter. arm I4 of the bell crank leverhas a pin 16 projecting'therefrom. at one" side,

actuating shaft 80 and the carried actuatin arm I8 will cause counter-clockwise movement of bell crank I0 with an accompanying movement of plate 64 to the left in Fig. 2. Upon a predetermined movement of plate 64 a pair of projecting pins I08 on latch '54 are engaged and the latch swung to unlatched position, immediately upon which the springs 48, 56 snap the plunger 36, 46 downward into forcible engagement with a shoe onlast 2!], as seen in Fig. 4.

As herein shown, the plate 64 has a pair of arms III), .2 pivotally mounted on its top side as at H4, H6, with a spring II8 urging the arms together., However, aivertically projecting part I 26 of. thev plate intervenes between the arms adjacent their pivots and limits their movement toward each other so that they normally extend in. spaced parallelism as seen in Fig. 1. When the plate 64 moves to the left, as previously described, it is the ends of arms H6, H2 that engage the latch pins 566 and, after the plunger has descended, the arms, on'the return stroke of plate 64, can yield to get past the part 56 on shaft 38 which will have dropped between them. It should be understood, however, that the plate 6'4'itself maybe so' shaped that it directly may engage and release the latch 54.

The tight fit of a pre-lasted' shoe which is'to be'relasted requires a shoe born to get the'rear part of the sho on the last. I'provide a suitable shoe horn I22 pivoted'at I24 at the upper ends of a pair of links I26- whose lower ends are pivoted at I28 on the yoke 32. The horn has a counter-weight I thereon tending to swing the horn clockwise about its' pivot I24 and, in conjunction with the weight of the horn and the links I26; tending to rotate the links clockwise about'their pivot I28. A stop I32 on the-yoke- 32 constitutes an abutment against'which counter-weight I36 engages upon gravitational clockwise swinging thereof when the horn is disen gaged from a shoe; The horn is adapted for manual engagement in a shoebetween' the back of the shoe andthe last 20 preliminarily'to operation of 'the-plunger'forforcing a shoe onto the last.

In the operation of" my improved Ice-lasting machine, the operator stands at the front of the machine as seen in plan' in Fig; 1, beside the I pedals 25, 83'. He or she, with the right hand,

placesa last 20; broken at'it's' hinge and having a shoe on its forepart, on thereduced' upper end I8 of'shaft I 6. With the left hand, the shoe liorn- I 22'maybe insertedin place; as'indicated' in'F'i'g'. 2. During'this' operation ofinserting a 50. The'forcible impingement of plunger head against the rear' part of the shoe-forces it down the shoe horn I22 and snaps thelast to extended position'. A further depression of pedal 83 engages pedal 25 so' that the latter is depressed'to elevate the last with the shoethereonthereby to causewith'drawalbf theshoe horn.

Duringthiselevation of-the last 20, the incidental further upward travel ofact'uating shaft 86 causes" the end of actuating arm: I8 to ride I 011' the-pin I6;- the arm swingingalittle counter clockwise against the resilience of spring I04. Hence, the platefl64 andltsarms H0, H2 are freed for return to the-right in Fig. 2. Also, as the last 2|] is elevated, the plunger 38, 40 is forced upward against the resilience of springs 48, 50 and the latch 54 ultimately drops by gravity into latching engagement with upper bearing part 36 of the yoke 32, to re-set the device. for a similar procedure on the next shoe.

When the pedal 83 is released, the shafts I 6 and 80, with their carried parts, drop by gravity back to their positions of Fig. 2, the shoe horn I22 having meanwhile droppedby gravity to its dotted position of Fig. 2. The last with a shoe thereon may then be removed and another inserted to receive similar treatment.

It is a feature of the invention that provision is made for re-lasting shoes of the open back type which have only a strap part for engaging around the back of a foot. Such a shoe is represtrap part'I34 to force the' strap over the shoe horn and the last as the plunger 38, 40 snaps downward on its working stroke. As the last is elevated for resetting the plunger, as previously described, the shoe horn iswithdrawn as in the previously described case, the finger I36 yielding as may be necessary so as not to interfere with movements of the parts.

It will be obvious from the foregoing description that I have provided a relatively low cost re-lasting machine which is extremely efilcient and effective and which requires a minimum of skill to operate.

I claim as my invention:

1. A re-lasting machine comprising a support for a last, a plunger mounted for movement between an inactive position and a position in which it engages a shoe partially engaged over a last on said support, spring means biasing the plunger to its said shoe-engaging position, latch means for releasably holding the plunger in its said inactive position, means for releasing said latch means thereby to cause a single forcible snap movement of the plunger to its said shoeengaging position for completing the engagement of the shoe over the last, and means for moving the last support in opposition to the said spring means biasing the plunger thereby to restore the plunger to its said inactive position.

2. A re-lasting machine comprising a support for a last, a plunger mounted for movement between an inactive position and a position in which it engages a shoe partially engaged over a last on said support, means biasing the plunger to its said shoe-engaging position, releasable means for holding the plunger in its said inactive position against the said bias, treadle-actuated means for releasing said holding means thereby to cause a single forcible snap movement of the plunger to its said shoe-engaging position for completing the engagement of the shoe over the last, and treadle-actuated means for moving the last support in opposition to the said plunger biasing means for restoring the plunger to its said inactive position.

3. A re-lasting machine comprising a support gagement of the shoe over the last, and means for elevating said support for a last against the said bias of the plunger to restore the plunger to its said inactive position.

4. A re-lasting machine comprising a support for a last, a plunger mounted for movement between an inactive position and a position in which it engages a shoe partially engaged over a last on said support, means biasing the plunger to its said shoe-engaging position, releasable means for holding the plunger in itssaid inactive position against the saidbias, treadle-actuated means for releasing said holding means thereby to cause forcible snap movement of the plunger to its said shoe-engaging position for completing the engagement of the shoe over the last, and treadle-actuated means for elevating said support for a last and the plunger engaging the shoe, to restore the plunger to its said inactive position.

5. A re-lasting machine comprising a support for a last, a plunger mounted for movement between an inactive position and a position in which it engages a shoe partially engaged over a last on said support, means biasing the plungerto its said shoe-engagingposition, a latch movable by gravity into position to latch the plunger in its said inactive position, a latch-actuating plate, and means for moving said plate into releasing engagement with said latch, thereby to cause forcible snap movement of the plunger from its inactive to its shoe-engaging position for completing the engagement of the shoe over the last.

6. A re-lasting machine comprising a support for a last, a plunger mounted for movement between an inactive position and a position in which it engages a shoe partially engaged over a last on said support, means biasing the plunger to its said shoe-engaging position, releasable means for holding the plunger in its said inactive position against the said bias, a plate slidably mounted adjacent said holding means and movable into releasing engagement with said holding means, a pivoted lever operatively connected to said plate, a treadle, and connections between said lever and said treadle whereby said holding means is releasable by depression of the treadle for driving the shoe into completely engaged condition over the last.

7. In a re-lasting machine having a support for a last and a plunger operable to and from a position where it engages a shoe partially engaged over a last on said support for completing the engagement of the shoe over the last, the combination therewith of a shoe horn insertible between the rear part of a shoe and the last on which the shoe is to be re-lasted for facilitating movement of the shoe onto the last in response to an operation of said plunger, means for holding said shoe horn stationary in said inserted position, and means for elevating the support for a last following a re-lasting operation of the plunger, thereby to effect withdrawal of the shoe horn from the re-lasted shoe and to restore the plunger for a subsequent re-lastin operation thereof.

8'. In a-- re-lasting= machine having; a: support for a last and. a-plunger. biased toward: a last on said support and; releasably" held in an inactive position against said bias; the combinationtherewith of means. for releasing said. plungencomprising a pin-carryinglever pivoted on a: fixed support, a swingable arm having its free end engaged against the'pin of saidleVer means. for moving said swingable arm bodily thereby to rock said lever; means connected with said. lever whereby a said rocking, thereof releases said plunger; and-means whereby saidswingable arm moves: out of: engagement with said: pin following a predetermined movement of said swingable arm.-

9. A re-lasting machine comprising a-support for a last, a plunger spring-biased in direction toward said support; meansfor. releasably maintaining. said plunger in an. inactive position against'the said spring bias, ashoe horn swingably mounted ona fixedpivot and insertible in a shoewhich is to be rel-lasted, means forz-releasing said plunger for. aspring 'actuatedrelasting.engagement-thereof with a shoe on arlast mounted. on-said-support, and means for elevating -said:support for restoringthe plunger to its inactive position and for simultaneously withdrawing the 'shoehorn fromthe re-lasted shoe.

10'. A- re-lasting machine comprising a support for a last, a support for a. plunger, aplunger mounted for movement in the plunger support indirections toward and from said'support for 'a last; a' relatively strongcoil. spring and a relatively weak coillspring: both urging said plunger in direction toward the: support for a last, a collar slidably mounted on the plunger between the two said:springs; a finger pivotally depending; from said collarr'andswingable by gravity, into engagement with thebackof; a last onsaid support for a last, said-finger. having a shoulder thereon for engaging; behind astrap of a-shoe upper, meansfor releasably holding the plunger inv an inactive: position against the resilience. of said springs, means forreleasing said holding means thereby to cause a re-lastingactuation of the plunger and a simultaneous yielding move.- mentof said finger to force said:strap of upper over: the.- rear part of the last,- and means. for elevating the: support for. a. last initially com,- pressingthelighter springto release the finger from strap-engagement and ult-imately'compressingthesstronger spring for restoringthe plunger to its inactive; position.

11. A re-lasting-machine comprising-asupport for, a last,.a plungermovablebetween. an inactive position and-.a re-lasting position andbiased toward the. latter position, a latch for maintaining the plunger initsinactive position against the said-bias; a latch-releasing member, a treadle, and connections between the treadle and said member whereby an initial. depression of said treadle releases. said latch thereby to causev arelasting actuation of the plunger, a second treadle in. the path of movement of thefirst. treadle whereby the second treadle is: depressed by thev first treadle following a predetermined initial movement of the latter, and connections between the second treadleand the support for a last whereby thesaid support isielevated by depression'of the second'treadle, thereby to restore the plunger to its inactive position following a re-lasting: actuation thereof.

ANGELO PERRI.

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