US2383530A - Shoe sewing machine - Google Patents

Description

Aug` 23, 1945- v L. L. aFum-:r-g4 2,383,530

- SHOE SEWING MACHINE Filed March 23, 1944 l 5 y [nz/@iz for Louis L. Barner' v BhisAttorney Patented Aug. 28, 1945 UNITED STATES IPATENT OFFICE l l l v 2,383,350

SHOE. lSEWING MAoIiINnV y Louis L. Barner, Endicott, N; Y., assignorto United Shoe Machinery Uorporatiom Flemington, N. J., a corporation of New Jersey Application March 23, 1944, serial Nt. 527,761

sclaims. (ci. 11a-39)V The present invention relates to improvements in back rests for inseam sewing machines such as are used for sewing uppers to the soles of turn shoes or the welts and uppers to the insoles` of welt shoes, examples of this general class of machines being illustrated invUnited States Letters Patent to Morrill No. 2,041,945, granted May 26, 1936, and to Eppler No. 1,108,560, granted August 25, 1914.

A machine ofthe type described inthe patents referred to is equipped with acurved hook needie, a Welt guide, if a welt shoe is being operated upon, or a back gage,` if a turn shoe is being operated upon. With eitherjtype of work the support of the work in the machine frequently is supplemented by the use of a bunter vor back rest contacting the bulging upper of a shoe close to y and |belowthe point of operation of theneedle..

As the sewing operation progresses around the shoe, the shoe upper rubs against the forward end of the back reist in an irregular manner, the back l rest moving in and out as the shoe is twisted and turned to present the shoe properly to the needle and frequently marking or otherwise damaging the surface of the upper as it rubs during progress of the operation.

In order to prevent the upper as it rubs along the surface of the back rest from being marked along the upper or otherwise damaged, attempts have been made heretofore to provide a rotating roll or vother non-marking shoe y rest. Prior shoe engaging rolls for this purpose `engaging member on the back l have been mounted to rotate on a substantially l vertical axis so that their outer surfaces will move withl the shoe as the shoe is fed from one stitch forming position to another Thus, the

fri-ctional rubbing movement of the bulging shoe upper along the rotating back rest member hasy been substantially reduced. It has beenfound, however, that the movement of the bulging shoe upper, while presenting a shoe to the stitch forming devices of a machine such as disclosed in the above-noted patents, is o-f a non-linear nature; the surfaces of the upper moving'vertically and swinging in many directions about the point of needle operation so that in spite of the use of a roll 0r other member rotating about a vertical axis on the back rest, the frictional mbbing en gagement of the shoe upper with the rotating member is 4not suiiiciently eliminated to `avoid marking or otherwise damaging the upper of a shoe being operated upon, particularly with those shoes having light-colored 0r fancy-linished uppers. Furthermore, an upper contacting roll rotating on a vertical axis causes a unidirectional effect,.}resisting vertical movement of the shoe without asimilar horizontal resistance, and is not conducive'to easy presentation of the shoe to the machine..

, The object of the present invention is to imyprove generally the construction and mode of operation of a welt and turn shoe sewing machine so thatY the movements in any direction required to present a shoe to the stitch forming devices of the machine during sewing will meet with less 'resistance than heretofore, while at the same time substantially all possibility of markingor otherwise injuring the finished surface of the bulging shoeupper will be avoided, and, accordingly, the

herein illustrated embodiment of an important featurel of the present invention resides in a curved hook, needle inseam sewing machine having` a bunter or back rest slide, at the forward work engaging end of which there is rotatablyv `mounteda button having an axis of rotation substantially horizontal or substantially parallel to axis, thel button will be caused to rotate during movement of the shoe in one direction while the toe -isbeing sewn and in the opposite direction while vthe shank` is being sewn, thus insuring ro- ,r tationof the button without tendency to abrade,

mark or otherwise injure the upper at any time. Between the times the toe and the shank of the shoe are being operated upon, the upper covering theball portion of a shoe contacts the back rest. The upper inthe ball portion of the shoe merges Withthe toe and shank portions and usually is characterized by rapidly changing curvatures. In orderto present., the shoev properly to thestitch :formingv devices, particularly along the ball portion, `it is thepractice `for an operator to turn the shoe-somewhat in anticipation of the approach of these curvatures. Turning the shoe in this way causes the point of contact between the shoe upper and 'the` button on the back rest, according to .this feature of the invention, naturally to be located somewhat ahead of the rotary axis of the button. In sewing along the ball portion of the shoe, the' curvature of the shoe bottom requiresalso a swinging movement about a horizontal axis passing through the sewing point,

resulting in a vertical movement of the upper along the point of contact with the back rest where the contact point is ahead of the sewing point.

With the upper contacting the button at a point ahead of the rotary axis of the button, vertical movement of the upper surface at the point of contact will cause the button-to rotate. rather: 3 than rub along the surface of the upper, as in the case of a xed back rest or a roll rotating on a vertical axis. Also, it is along the ball portion of mi the shoe that the greatest vertical and swinging.. movements are required to present the shoe properly to the operating devices. fsWhile. sewing along the ball portion, due to the increasing bulgef oi the upper beyond the edge of the shoe bottom, l

the point of contact between thebutton-.and:.the f upper changes and moves from a'position above the rotary axis of the button to a positionbelowL i the. rotaryaxis. As a result, the button changes,... its direction of rotation gradually... In addtiun.

because of the vertical curvature..4 of the. shoe.. bottom, the forward linear movement of the upper.

along `the point. of contact. .withE the .back rest.. terminates temporarily,. and .the shoedsgiven an easy` unresisted swinging.. movement. aboutlthej..

point of sewingoperations..

Theseand othenfeaturesof thejinvention consist ofl certain.constructions, arrangements and combinations .of parts. the .advantages .of which'.

will be clearly. .understoo.d.from. the` following..

description taken in connectionwith. the @accompanying drawing, in ,which Fig. 1 is a view in rightahandside elevation; of a portion of a shoe. se .ng.machine. embodying the present invention;

Fig. .2 is a detail View on 4anenlarged.Sca-le of some Aof the partsof the machine .illustrated in Fig. 1, togetherwitha shoe shown in section. in operating position .whilesewing .along the 'shank of theshoe; r

Fig. 3 is.a.similar. view, illustrating the positions of the parts while .the .toe.of theshoe .is being sewn;

Fig. 4 tions of the backrest but is a detail .plan View, illustratingtheposirelation to a shoe while sewing at the ball line oi the shoe; and

Fig; 5 is a deta thepoint. of contactof the 'surface of ashoe upper while sewing along the ball portion of. the'shoe.

The machine. illustrated in the'drawingis intended to sew a welt to a Goodye'artypeof shoe I and is provided` with .the usual stitch forming ontal .guideway as will be described morefully hereinafter.

The forward end of the .back restslide of the.

machine embodying the. presentv inventionljs formed with an offset lug I 6 having avertical slot. I1 into which is adjustably clamped afbushing I8. The bushing I 8 rotatably lreceives a 'horizontal spindle20 attached 4at its forward end to or ton in the machine with :j l

il View in elevation, indicating 6; a channel guide. 8, a welt back rest .or bunter slide I2 L ymechanism I3 simi- .2.157,-.g1anted Jurre. 8, 1915,. ativemachine .also are the. patents. except,. for the work engaging end of the. back rest slide,

integral with a convex button 22 the exposed surface of which comprises a segment of a sphere. On the forward face of the lug I6 is a thrust bearing plate 24 against which is pressed a 5 shoulder 26 beneath the button, acting to space the` button 22 from the thrust plate 24.

For convenience in assembling the parts, the thrust plate 24 is formed integrally with the bushing I8 and the rearward endy of the bushing threadedly receives a clamp nut 28 acting against a washer 30 to secure the thrust plate and bushi ing l.to the .lug I6. For retaining the spindle against lengthwise movement in the bushing, the rearward fend'of the 'spindle is threaded inter- 15 inallyi'and a'screw `32 entering the threaded p0rtion of the spindle 4has a head projecting radially from the axis ofthe spindle sufciently to overlap the internal diameter of the bushing.

Tharrangement of the lug I6 and the bushing 2.0 I8 is such as to hold the spindle. on a horizontal rotary. axis,.indicated at 34, parallel to the move.-

ments .of the slide I 2 and vertically. spaced within a plane -36 dened. by the/needle, said axis lying...

outside the. needlearc y.beneathan'd.parallel to a'. line tangent to the .nearest portion .ofthe needle-ffl.

which .engages the shoe.` V.The .upper .of a shoe presented tothemachine contacts the surface of the button at the intersection of a line 38 (Fig. 3) ,-f

above. the. axis .34 of the spindle while sewing.

about thetoe -of the shoe. While sewingl alongi.,

the.shank of the shoe (Fig. .2) ,the button .will

engage lthe. upper at the. intersection of a line 40 belowthe rotary, axisof the button. Hence, in

these .two sewingpositions of the. shoe', the button .35 willbe rotated in opposite directionsas indicated.

by the two arrows in Figs. 2 and. Between,...

thesesewing positions, illustratedin Fig. .4, in

order to present. theshoe properly to thevstitch forming devices, the greatestdegree of angular...

40 or swinging movement isimparted. by reasonof the bottomcurvature along the ball portion.

The swinging movement of the. shoe, aboutan...v

I approximately. horizontal axis .while sewing I,.tl'ie.

ball portion in approaching the shank, as shown. in Fig. 5, is of sufficient extent to cause the.upper.,. v

along that area contacted .by ,theback rest .to terminate .temporarily its forward linear ...movei ment and, particularly with. high-,arch shoes,.to reverse its .linear ,movement slightly.. Reversal...

of the linear movement'in that .area of the upper,

contacted by the .back rest. causes the button 22M.

alsoto reverse its directionof rotation... Asthe.

sewing continues .along the `ball portion of-the.

shoe, .thepointof engagement between the upper...

and the button moves downwardly past therotary axis of saidbutton ,at that sideof the button axis, .l with respect to the .directionof feed,.in advance..

.f of the. button .axis,. as indicated by the .arrow in Fig.l 5. .Whenthesewing along the ballportion., y

e0 of the shoeisnearly completed, the point of con.

tact4 .42 of theuppen with the. button is at the.

intersectionof the.. linev 4,4 with the. upper, in Figs. .4. and 5, below the rotary axis, with. respect tothe direction of feed, and, since the curvature...

of the. shoe bottom is such as to requireno fur-.

ther substantialswnging.movement in present-y. i ing the toeof the shoe Vto the stitch forming .de-,2.

vices,.there..will be butlittle change in the`.poi nt.

of contact -between the upper and the button. 7.0 Eventual1y,..when the `shank of the. shoe :is

ton is reversed, in the manner described, twice reached,- the point y. of contact 42. y between -the upper. and the buttonwill. travel .to a position... more nearly directlybelow the button axisin line., with the sewing point.. The rotation of thebut-f.l

during each sewing operation, once after starting, while leaving the shank, and again upon reentering the opposite side of the shank.

To prevent indentation of the upper while, at the same time, avoiding the possibility of contact between the relatively sharp edges of the button and the upper, the spherical upper engaging surface of the button 22 is made with a suiciently large radius to engage a substantial area on the surface of the bulging shoe upper. By providing a substantial area of contact, not only is indentation avoided but also the pressure of the upper against any unit area of the button is kept below that which will cause appreciable marking of the v upper or injurious effects from abrasion between the upper and the surface of the button, even when the button is composed of relatively soft metal. Furthermore, the upper engaging surface of the button is finished with a smooth polish so that rotation at the point of engagement With the upper has no substantial injurious effect.

The use of a button of this nature, located and arranged as indicated, avoids nearly all resistance to the positioning movements of the shoe while presenting it toy the machine, such as occur when a stationary work engaging member is provided on the back rest slide. Also, with the button rotating about a horizontal axis, there is no substantial tendency for the shoe, while its position is being changed during sewing operations, to deviate from the desired `direction of movements as a result of directional eiects from rotation of a roll on a vertical axis, the surface of which acts to steer the shoe along a right line passing through the point of contact.

The nature and scope of invention having been indicated' and a preferred embodiment having been specifically described, what is claimed is:

l. An inseam shoe sewing machine having stitch forming devices including a curved hook needle, and a back rest slide, in combination with a button rotatable on the slide about an axis substantially parallel to a line tangent to that portion of the needle engaging the Work.

2. An inseam shoe sewing machine having stitch forming devices including a curved hook needle, and a back rest slide, in combination with a button rotatable on the slide about an axis substantially below and parallel to a line tangent to that portion of the needle engaging the work.

3. An inseam shoe sewing machine having stitch forming devices including a curved hook needle, and a back rest slide, in combination with a button rotatable on the slide about an axis substantially parallel to a line tangent to that portion of the needle engaging the work and spaced below the needle sufficiently to cause the face of the button to engage the bulging upper of a shoe being sewn above the axis of the button while sewing the toe portion of the shoe and below the axis of the button while sewing the shank of the shoe.

4. An inseam shoe sewing machine having stitch forming devices including a curved hook needle, and fa back rest slide, in combination with a button rotatable on the slide about an axis substantially parallel to a line tangent to that portion of the needle engaging the work and in the plane of the needle outside the needle arc.

5. An inseam sewing machine having stitch forming devices including a curved hook needle, and a back rest slide, in combination with a button having a convex face rotatable on the slide.

about an axis substantially parallel to the movements of the slide during sewing operations.

6. An inseam shoe sewing machine having stitch forming devices including a curved hook needle, and a back rest slide, in combination with a work engaging button mounted for rotation on the back rest slide having for its work engaging surface a segment of a sphere so located and of suiiicient area to enable the point of engagement of the shoe to move across the rotary axis of the button during sewing operations.

, y LOUIS L. BARNER.

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