US1050568A - Shoe-sewing machine. - Google Patents

Description

J. Rf SCOTT. SHOE SEWING MACHINE.

APPLICATION FILED 1120.5, 1907.

1,050,568. I Patented Jan.14,1913.

'4 SHEET S-BHEBT 1.

was? liipz/enzar .Af/7ihfl J. R; SCOTT. SHOE SEWING MACHINE. APPLIOATiON FILED DBO. 5, 1997. 1,050,568. 1 Patented Jan.14,1913.

4 SHEETS-SHEET 2.

J. R. SCOTT. SHOE SEWING MACHINE. APPLICATION FILED DBO. 5, 1907.

Patented Jan. 14, "1913.

4 SHEETS-SHEET 3.

I 2760621502? 0. 0 @MMZI.

J. ,R. SCOTT.

SHOE SEWING-MACHINE. APPLICATION FILED DEC. 5, 1907.

Patented Jan. 14,1913.

UN TED sTATEs PATENT OFFICE:

JACOB R. SCOTT, 015 BOSTON, MASSACHUSETTS, ASSIGNOR T UNITED SHOE MACHINERY COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY,

snon-s'nwms MACHINE.

To all whom it may concern:

Be it known that I, JACOB R. Soon, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in'Shoe-Sewing Machines; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains -.to make and use the same.

The present invention relatesto shoe sewing-machines and more particularly to shoe sewing machines which comprise a straight therewith toform a chain stitch, and in which the shoe is supported, during the sewing operation, upona horn which extends inside of the shoe. 2 0 improvement on the well-known McKay shoe sewing machine which has been extensively used for many years and the construction of which is disclosed with substantial accuracy in United States Patents No, 36,163, dated August 12, 1862, and No. 45,422, dated December 13, 1864.

in. the McKay sewing machine, as the needle rises through the work with a loop of thread, the presserfoot and feed point are raised a short distance to free the work from the upper surface of the horn so as to allow .the thread to be drawn from the pre' ceding loop without binding upon the upper t0 befedJ As the needle reaches the limit of its upward stroke the work is fed by the feed point and then the presser foot and feed point are allowed. to descend, the presser foot at this time being pressed I against the work with a yielding spring pressure so that it autou'iatically accommodates itself to variations in the thickness of the work. The stitches are tightened and set by the upward pull of the needle on the loop of thread drawn up by the needle, and during the 'oulling action of the needle to lighten and" 'titch the presserfoot by the engageni i I movable fulcrumba it W 2 engages a p oiee ie .Q 0o bar oro'n a lever connected resultof'this mode of p-i sl l r flv t i iat sins together; and compressed ja projection ,1 qrhe n ed,

Specification of Letters Patent.

Application filed December 5, I907. Serial No. 405,235.

hooked needle and devices cooperating Theinventionis intended primarily as an surface of the horn and to allow the work- Patented J an.14,1913

solely by the pull exerted upon the loop of thread drawn upby the needle. The principal object of the present invention is to improve the mode of operation of layers of material will' be. more firmly pressed together and a tighter "seal uproduced than is possible where the compres sion of the materials and the tightness of the seam depends entirely upon the pull needle. e

Other objects of the invention are to im-- mechanism for actuating the needle 'bar 'so as to decrease the strain upon the thread rate of speed, and to improve the mechanism for actuating the cast-off whereby it operation; L y I l/Vith the above'objects in view a feature between the presser foo't and the'h'orn,- with a greater force than is produced the pull of the needle on the loop oftfh'readorby the spring which allows the 'p'resser foot wee: commodate itself to variations in the thickness of the work. In the machine hereinafter described as embodying the preferred form of the invention, the presser foot, is actuated by mechanism including a locking device, which device do'es notirclease tl" presser foot so as to allow iris-amoral itself to the thickness of hipster-k unti the work has been conipr presser foot and the hm amount of force. I a loop of thread and the feed point feeds the work in thesame maner as in the McKay machine, but after thework has been fed and-while the needle remains in its highesl accoiin nodate' itself 3 the presser foot'and stitch formingv devices of machines of the same general type as the: McKay shoe sewing machine so that the exerted upon the loops of thread by the prove the construction 'andarrangement of I certain of the parts of shoe sewing machines--' of the type referred to and particularlythe and permit the machine to be run ata higher is rendered more certain and reliable of the present invention contemplates th'eprovislon of means for actuatingthe presses toot soas to compress'the layers ofmati'arial- 4 s d fbetwe e t "position," the presser footl is forced "down material. This feature of the present invention,- broadly considered, contemplates the use of any suitable locking-device. The preferred form of locking device, however, comprises cooperatingfriction surfaces, as

thereby lost motion is prevented, and the actuating mechanism for the presser foot can act with certainty to raise the presserfoot to the desired distance during the tp ward stroke of the needle. This is important in machines of the same general type as the McKay sewing machine, since the position of the presser foot, when raised,

-determines the extent of the upward movementof the needle and the length ofthe loop drawn up by the needle, and upon the lengih of this loop depends, to a great extent, the tightness of the seam, as is fully explained in the United States patents hereinbefore referred to. Preferably the locking device is mounted directly upon the presser foot bar as thereby any lost motion in the other parts of the presser'foot actuating mechait e beginning oft-he upstro so that no sudden jerk-is exerted upon the thread and the machine can be run at a higher. rate of speed without danger of breakin the thread. Also the provision of this yie ding abutment prolongs the dwell of the needle at the limit of its downward stroke while the whirl is laying the thread in the'hook' of the needle, so that a smaller eccentric for operating the needle bar can be used than is required in the McKay machine and less movement of the fulcrum ost is required, which is .an advantage w en the machine is-operated at a'high speed.

Other features of the present invention consistiin an improved mechanism for. ac tuatingthe castpfl, and in certain improvedd'evices, combinations and arrangements hereinafter described and claimed.

I The. novel features of these mechanisms and devices and their advantages will be a parent to those skilled'in the art from t e following description taken in connection with the accompanyingdrawings in which- 1Figure 1 is a new in front elevation of :theghadofa lma chine embodying the sameina-theiriprferred fof'm;. Fig.' 2 is a view-in fiside zel'evation-ofithe head of the machine -lookin va wie'wnmvsideelevation of the head ofthe eni'achinaldoking afrom the left of Fig. 1;

from.the= r i-ght of Fig. 1 Fig.3 is

Fig. is a detail view illustrating the construction and arrangementof the cam and treadle operated levers for actuating 'the resser-foot bar; Fig. 5 is a view in side elevation of the parts illustrated in Fig. 4; Fig. 6 is a detail sectional view illustrating the presser-foot bar and a portion of the mechanism by which it is actuated and controlled.

The machine in which the several features of. the present invention are embodied in their preferred form has the same general construction and arrangement ofparts as the McKay shoe sewing machine herembefore referred to and comprises a horn upon which the shoe is supported, a straight hooked needle secured at the lower end of a vertical reciprocating needle bar, a cast-01f, a presser-foot secured to the lower end of a vertical presser foot bar, and a feed point.

The needle bar 1 is mounted to reciprocate in guideways in the up er and lower plates 2 and 3 of the head of the machine, and is connected by a link 4 to a lever or walking beam 5 pivotally mounted at its center up'on'the upper end of the needle bar fulcrum post 6 and connected at its rear end by a link and strap 7 to an eccentric crank pin on the cam shaft 8, the construction being the same as in the McKay machine. The fulcrum post has a limited rising and falling movement as in the McKay machine-so as to cause the nedle to dwell at the limit of its upward and downward movements and the needle is held in position during the movements of the fulcrum post by means of a friction block 9 mounted in the upper plate of the head of the machine.

Upon the fulcrum post is mounted a sleeve 10 provided with a horizontal arm '11 in which an adjustable screw bolt 12 is clamped. The lower end of this screw bolt during the downward movement of the fulcrum post, is arranged to engage a stop-13 formed on a lever 14: pivoted at its rear end on the lower plate 3 of the head of the 'machine and connected at its front end by means of a link 15 to. the presser-foot bar 16. The screw bolt 12 thus forms an -ablutment, carried by the fulcrum post 6, to engage the stop lever 14 and limit the downward movement of the fulcrum post. The sleeve 10 on the fulcrum .p'ost is pressed downwardly by means of a spring 17 coiled around thepost'and interposed between the sleeve and an adjustable 52st- 18 on the post. The downwardmovemehtlof-the sleeve under the force of the spring, is limited by a. stop l9 on the post'v which stop is provided with projections engaging slots in the lower end of thesleeve to prevent it from turning. The abutment 12 which contacts with the stopl ver jet during the-downward movement of tiie fulcrum.post 5; is thus yieldingly mounted, and the fulcrum post is permitted to -vield downwardly ju stbefore the needle begins its upward movement,

so that no sudden jerk is exerted upon the thread and the dwell ofthe needleais long I foot bar connected enough to enable the thread to be laid in its hook. I To enable the presser foot to be raised by? the operator when the work is to be inserted in the machine, 'a lifting lever is provided, the forward end of which extendsunder a pin 21 projecting laterally from the stop lever 14 and the rear end of which is con nected to a treadle a'ctuated rod 22, the arrangement being such that a depression of the rod raises the sto lever and the presserereto. The resser-foot bar is guided-mt its lower 'endby a gaideway. in the lower'plate of the a a head I of t I e machine, and at its upper end extends through an adjustable sleeve 23 sci (aw-threaded into a fixed sleeve 24 extending upwardly from the upper plate ofthe head ofthe machine. A spring 25 is coiled around the resser-foot bar and is interposed between the lower end of the adjustable sleeve 23 and a collar 26upon the rod.

spring acts, when the presser-foot vbar Q is released, to 'hold' the resser-foot yield-l ingly in contact with the work, and permits the resser-foot to accommodate itself to variations in the thickness of the work. By

a c a nyof the spring can be increased or d1- adjusting the adjustable sleeve 23, the ten-' minished as desired. The downward positron of the presser feot, when no work 111 themachine, is determined by an adjustable block 27 secured to the upper end of the presser-bar and arranged to engage the upperend of the adjustable sleeve 23.

The locking device which forms a part of the mechanism by which the presser bar is lifted a uniform predetermined d stance from the upper surface of the work regardless of its thickness, and by which (the Presser-foot is depressed to compress the work between the presser-foot and the/horn, consists of. two members, one of which is a nut 28 engaging a screw-thread 29 of steep pitch cut on the presser-foot bar. This nut,

when'not engaged by the other member of the locking device, is free to turn, so that it ofiers'no resistance to the rising and falling movement of the presser-foot; f iT-he nut is supported by an arm 30 projecting from a sleeve 31 mounted'on a vertical rod 32' at the rear of the presser-foot bar. A spring e pine-es {The downward r the 1? e by an adjustable sto ia grooveiin the xiar,, whics; mve

movement of nut. independen 33 is coiled around this rod and. acts to force 31 v wat ly t of the sleeve" 3 ilngii .i limit d, c at 3 on thef'fro z T W enies e n 2 n a in 1s 'sw ef. enough to .8] longitudinal t y ofthe Y arm, the upper andlower surfaces of the a as arm-acting as stops to limit theindependent movement of the nut in each direction. The other member of the locking device consists of a block 35 mounted to slide freely on the presser-footbar below the nut member. The block 35 is provided with laterally pix 'jecting pins 36 upon which blocks 37am mounted which are received in slots in the,

forked forward end .of an actuating lever 38, the rear end of which is provided with a roll engaging a cam groove in a disk on the cam shaft, the cam groove'and lever-acting to raise and lower the block at the pro times during the operation of the machine. The upperend of the block 35 is provided with a slightly tapering friction'snrface 39 which is adapted to engage a corresponding friction surface 40 formed on the nut mem-.' ber of the locking'devicef When the block 35 is raised it engages the nut 28'and lifts it'independently of the arm 30 until the lower surface of the groove in the nut engages the lower surface of the arm. Duringthis independent movement of the nut the pressure of the friction surfaces on each other is slight and the nut rotates on the bar 16. During the continued upward movement of the block the arm 30 and sleeve '31 are raised with the nut 28, and the spring" 33 forces the friction surfaces to gether with a heavy pressure so that the nut is held from rotation and the presser foot bar israised. The throw of the actuating lever 38 is uniform and inasmuch as the friction surfaces of the nut and block-are al ways forced together with a'heavy pressure at the same polnt in the upward'movement of the block and there is no lost motion of rotation between the block and nut thereafter, the resser-foot is always lifted a oer.-

tain and uniform distance. 'Durin the downward movement ofthe locking evice to depress the resser-foot, the nut held in engagement with the block by the spring 33 acting on the nut supporting sleeve 31 until the sleeve strikes the stop 34, andas the block 35 continues its downward movement the nut 28 is moved downwardly in dependently of the sleeve and arm 30. The prcsser foot is thus moved downwardly a greater distance than it was raised, and the work is compressed between the resser-foot and horn by the force exerted by the-spring 25 acting on the presser bar 16 and by the force required to separate the frictionsui':

. faces 39 and 40 on the nut and block, which latter force is greatly excess of I that ex'- tihues to'hold thefrictibn' surfaws in engagemenfl'and the surfaces have become. wedged together by the action of the springs 25- and rted by the spring 25' sinee the spring con-s '33during the-"upward .movement' of the presser barf Thed'ownward 'movement of .thepresser-foottakes place'at the end of the feeding movement when. the needle ism 1H8 highest position, and the force .withwhich thelpress'er-footfis depressed is sufiicient to firmly compress the layers of material between the presser-foot and horn.

a .The cast-d of the machine isof usual construction, and is timedto operate in the usual manner. The cast-off issecured to the lower; endv of a ban 41. which .is yieldingly connected at its upper end to alink 42, the upper endof which. is pivotally connected 3 tola lever 43- mounted upon thesame center as the walking beam 5 which actuates the needle bar. This lever, at its rear end, is provided with a suitably shaped camslot 44 which is engaged by a pin 45 projecting laterally from the link .7, connected to the rear end of thewalkingbeam 5. By forming the slot 44 'directly' in the rear end. of the actuating lever 43,-a strong and durable construction is-provided and the cast-ofl" .is actuated positively and with certainty in therequired manner. a The mechanism for supporting and actuatingthefeed point is the same .asin the commercial McKay sewing-machine. with the 25; exception :thattheLcam-operated arm 46, in-

,"s'teadi of being rigidly mounted upon the rock shaft 47, is loosely mounted. thereon, and is provided with a rib 48, which extends between. two. adjustable stopscrews 49 mounted :in an arm 50 rigidly seoured'to the shafttk :By meansof thisconstruction the mechanismgfor actuating the feed point can be adjusted 'tovary theihrow of the feed .point as may'be desired.

-. 35' The'*operation of theyariousparts of the machine-"illustrated in the .drawings'z'and above described has been indicated in. the description already given and will be readily understood by those skilled in the art.

, 4( The='.-nature and scope of the present. in-.

vention h'avingzbeen indicated and a'machine embodying the various features of the invention'in their preferred form having been specifically described, what is claimed .1. Aychaino stitch shoe 'sewingfmachine, vhaving,iir'combination, a hooked needle, a horn to enter the shoe means located in the horn'forlaying'the -t read in the hook of 59 the needle, means-for feeding the work, a

presser foot, a spring actin when the on foot is released. to hol the presser ioot' against the work, and mechanism 'for actuatin the. presser foot constructed, to

,615 engage t e presser foot and raise it a uniform distance regardlessof variations in the thickness of the work to permit the work to its fed and to depress the presser fopt through a greater lstance to compress the .60 work between the dpresser foot and horn after the work is fe x 2. A shoe sewing machine, having, in combination, stitch forming mechanism, a work support, a resser foot, andmechamsm for 66 actuating. e presser foot constructed to greater distance to compress the work between the presser foot and work support and to release the presser footto allow it to accommodate itself to variations in the thickness of the work. a 3. A chain stitch shoe sewing machine, having, in combination, a hooked needle, a horn to enter the shoe, means located in the horn for laying the thread in the hook of'the needle, a presser foot, mechanism for actuating the needle, meanscontrolled by the presser foot for varying the retracting stroke of the needle, a' feed point on the same side'of the work as the presser foot, mechanism for actuating the feed pointv to feed the Work while the needle is out of the work, and mechanism includin a locking device for actuating the presser o the presser foot a uniform predetermined distance regardless of variations in the thickness of the work, and to depress the presser foot through a greater distance after the work has been fed to compress the work between the presser foot and born.

4. A chain stitch shoe sewing machine, having, in combination, a hooked needle, a horn to enter theshoe, means located in the horn for laying the thread in the hook. of the needle, a presser foot, mechanism :for actuating the needle, means controlled by the presser foot for varying the retracting stroke of the needle, means for feeding the work, and mechanism including a locking device for actuating the presser foot con-, structedto engage the presser foot and raise it a uniform distance regardless of variations in the thickness of the work, todepress the presser foot through a greater distance to compress the work between the presser foot and horn, and to release the presser foot to allow it to accommodate itself to variations in the thickness of the work. 5. A chain stitch shoe sewing machine, having, in combination, a hooked needle, a work'support, a presser foot, means for feeding the work, and mechanism for actu-' ating the presser foot constructed to raise ct to raise distance regardless of variations inv the thickness of the work before the work is fed, to depress the presser foot through a greater distance after the work fed to compress the work between the presser foot and the work support, and'to release the presser'foot to allow it to accommodate itself to variations in the thickness of the work. i

7. A shoe sewing machine, having, in

combination, a hooked needle, a work.sup-' port, a presser foot, mechanism for actuating the needle, means controlled by the presser foot for varying the retracting strokeof the needle, a presser foot bar, a friction locking device mounted directly on the bar and mechanism for actuating the locking device constructed to. raisev the presser .foot from the work support,'to;de-

press the pressef fest through agreater distance to .compress he work between the presser foot and wor support; and to release the presser foot to allow it to accommodate itself to variations in the thickness of the work. i 8. A shoe sewing machine, having, in

- combination, a hooked needle, a work support, a presserfoot, mechanism for actuating the needle, means controlled by the:

. presser foot for varying the retracting stroke of the needle, a presser foot bar, a rotatable nut having a screw-threaded engagement with the bar and provided with a clutch surface, a non-rotatable block provided with a coo'perating clutch surface, and means for actuating the block to clutch the nut and then'move the nut to raise the presser foot. I

9. A shoe sewmg machine, having, in

. combination, a hooked needle, a Work support, a presser foot, mechanism for actuating the needle, means controlledby the presser foot for varying the retracting stroke of the needle, a presser foot bar, a

locking device comprising a rotatable clutch member having a screw-threaded engage ment with the bar and a non-rotatable 00- operating clutch member, means for actua t ing one of said members to bring said members into engagement and then move said members to raise and lower the presser foot, and means for supporting the other member arranged to limit its movement with the bar in a direction .to lower the presser foot and permit it to move independently of the bar for a limited distance in the oppositedirection.

10. A shoe sewing machine, having, in

combination, a hooked needle, a work support, a presser foot, mechanism for actuatmentwith the bar and a non-rotatable cooperating clutch member, means for actu ating one of said members to bring said members intohengagement and then move said members to raise and lower the presser foot, and a movable spring pressed support in which the other member is mounted to have a limited longitudinal movement independently of the presser bar.

11. A shoe sewing machine, having,-'in combination, a hooked needle, a work support, a presser foot, a; needle actuating lever, a movable fulcrum therefor, a stop connected with the presser foot and adjusted thereby-and a yielding abutment connected to said fulcrum arranged to engage said stop and yieldingly support the fulcrum at the beginning of the retracting stroke of the needle.

12. A shoe sewing machine having, in combination, a hooked needle, awork supnectedwith. the presser foot and adjusted thereby, an abutment connected to said fulcrum arranged to engagesaid stop and determine the retracting stroke of the needle, and means for permitting the fulcrum to yield at the beginning of the retracting stroke of the needle.

13. A shoe sewing machine having, in combination, a hooked needle, a cast ofi, a work support; a presser foot, a needle actuating lever, a movable fulcrum post therefor, means controlled by the presser foot for limiting the movement of the fulcrum post to vary the retracting stroke of the needle, a

cast off actuating lever mounted on the fulcrum post and provided with a cam slot im-- moyable with relation to the lever, and

mechanism 'for actuating the needle lever provided with a pin engaging said cam In testimony whereof I aflix my signature, in presence of two witnesses.

I JACOB R. SCOTT.

Witnesses:

FRED O. FISH, ANNIE C. RICHARDSON.

Gcples at this patent may be obtained for five cents each, by addressing the Commissioner of Iatentl Washington, D. G.

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