US1772050A - Shoe-sewing machine - Google Patents

Description

Aug. 5, 1930. o. L. LAWSON SHOE SEWING MACHINE 2 Sheets-Sheet 1 Filed May 26. 1926 @l 1/ I J Aug. 5, 1930. 0.1.. LAWSON 1,772,050

S HOE SEWING MACHINE I Filed May 26. 1926 2 Sheets-Sheet 2 ,7; INVEN+DYZ I (95. f. f n E7 Muv 9121.

Patented Aug. 5, 1939 UNITE STATES OSCAR L. LAWSOET, OE LYNN,

MASSACHUSETTS, assrenon, 'ZBY MESNE FATE NT eg nssremannrs,

TO UNITED SHOE MACHINERY CORPORATION, OF EATER/SON, NEW JERSEY, A COR- PORATION OF NEW JERSEY vsnonsinvi MACHINE Application filed May 26,

This invention relates toshoe sewing inachines and especially, although not exclusively, to machines of the type shown and described in an application for Letters Patentfiled by James H. Reed, March 10, 1922, Serial. No' 5%2,666. A machine of this type is adapted to sew a through-and-through lock stitch seam through the insole, 'outsole and upper of a shoe, and includes a straight hooked needle and a shuttle supplying a shuttle thread at the upper side of the Work, while at the under side of the work is a work supporting horn provided with a looper or whirl which supplies a cop or needle thread, together with take-up and stitch setting mecl anism to draw the needle loop over the shuttle and set the stitch.

The present invention relates particularly to the horn and certain associated parts, particularly the take-up and stitch setting mechanism. The invention has for an object to provide a. simple and compact mechanism wherein a single thread engaging member performs the functions of both a stltch-forming take-up and a stitch setter, the arrangement being such as to avoid cramping of the parts, and said member engaging the thread relatively close to the stitch-forming point. Another object of the invention is to provide a construction and arrangement of parts wherein the needle or cop thread may receive an application of hot wax or wax which is softened by heat as distinguished from solvents, which type of wax has been found to be greatly superior to a wax solution, but which it has not usually been convenient to use in machine sewing due to its tendency to harden between the point of application and the stitch forming point. In carrying out the latter object, a heated wax pot is provided in the horn, and therefore relatively close to the stitch-forming point (the use of a single take-up member in the horn permitting. this arrangement), while said horn is also provided with heating means to prevent coollng and hardening of the wax duringthe passage of the thread through the horn from thewax pot to the stitch forming instrumentaht es.

The foregoing and other objects of the 111- vention together with means whereby the lat- 1926. Serial No; 111,331.

understood from the following description of one form or embodiment thereof illustrated in the accompanying drawings. It. willbe understood, however, that the particular construction described and shown has been chosen for illustrative purposes merely, and that said invention, as defined by the claims hereunto appended, may be otherwise embodied without departure from the spirit and scope thereof. i i

In said drawings:

Fig. 1- is a side elevation, partly in section, of substantially the complete machine. c

Fig. 2 is a front elevation of the lower portion of the horn and certain associated parts, the horn base and wax pot being shown in section. V

l ig. 3 is a horizontal section taken substantially on line 3-3, Fig. 2.

Figs. 4 and 5 are enlarged detail sections taken on the lines l4 and5 5, respectively, Fig. 2.

Figs. 6and 7 are sections on the lines 66 and 77, respectively, Fig. 2;

it capable of being inserted into the toe of a shoe and includes upper andlower angularly disposed portions D and E rigidly connected bv an intermediate elbow F. Said horn is provided with a journal portion 20 rotatably mounted in a bearing 19 secured to the front of the base 15 at the top of the latter, the arrangement being such as to permit said horn to be turned as the sewing progresses. The needle 21, which is above the work A, is straight and is formed adjacent its pointed lower end with an open, loop-engaging hook, said needle being carried by a needle bar 22 guided for rectilinear reciprocating movement in thehead 1 8. /Vithin the tip of the horn 16, and therefore below the work, or at the opposite side thereof from the needle 21, is a whirl 23 which is rotatably mounted in said horn "and is provided with an eccentric invention ill best be i -the work.

. said shuttle having a bined takeup and machine. a 42, with thefshaft 38 is a vertical shaft 43 opening through which the cop or needlethread C passes and withan axial opening to receive the point of the needle when the latter descends to penetrate the work, whereby said whirl. operates to form a loop about the needle immediately above the hook of the latter. Thereafter, as theneedle rises, the loop so formed is drawn upwardly through side thereof as theneedle, is an oscillating discoidal shuttle 26 carrying a shuttle thread, hook or beak adapted, to remove the loop of when the needle rises,

needle thread from the needle hook and pass it about the shuttle and shuttlethread. The machine also includes, below the work, a comthe needle thread C to draw the needle loop over the shuttle and down upon the work, thereby completing the formation of the stitch, and thereafter to set the latter by drawing the thread locks into the material. The needle thread is held for the action of the take-up 28 by a thread clamp 34 and is drawn from the supply in measured'quantities for each stitch by a combined pull-off and thread measuring device 35. Said thread is also held for the action of the pull-off 35 by a secondthread clamp 36.- The thread clamps 34 and 36 and pull-0E 35 are operated by mechanism generally indicated at 37, said mechanism being preferably of the type more fully described in another application filed May 26, 1926, Serial No. 111,859.

The needle bar 22 and shuttle 26 are 'actuated-through suitable connections not shown in detail, from a or 'power'shaft 38 j'ournalled in the head 18- from any suitable source loosely mounted thereof a and receiving power through a pulley 39 on and connected therewith by means clutch 40 operated through suitable connections by a treadle lever 41 at the base of the Connected, as by spiral gearing which extends downwardly'along or'through the standard 17, and is journaledat its lower end in a bracket 44 on the base 15.

- eludes angularly disposed shafts 46 and 47 The whirl 23 is operated by mechanism which as herein shown is of the type more fully disclosed in another application filed May 26, 1926, Serial No. 111,860, and inin the horn 16, said shafts being connected with each other by gearing 48, the shaft 46 i being suitably geared to the whirl 23, and

the shaft 47 being connectedby ge'aring 50 I with a hollowvertical shaft 51 which extends ournal portion 20of the,

axially'through the j horn. The shaft 51' is connectedby gearing 53 with one end of a horiz'ontalshaft 54 ournalledin bearings on the base 15, connected at its opposite end by gearing vertical shaft 43, and carrying cams 24 and Above the work, or at the same stitch setter 28 acting on horizontally disposed main 3 with the,

During the Iormation and setting of each stitch, the work A is clamped upon the born 16 by a pressure foot 56 carried by a presser foot bar 57 which is normally pressed dow'nwardly by a spring 31 and is periodically raised, to permit feeding of the work by instrumentalities generally indicated at 29, by

means of a bell-crank lever 58 actuated by a cam on the main shaft 38. The presser foot 56 may also be manually raised to permit re moval and insertion of the work by a lever 59 engaging the presser foot bar 57 and connected by a link'60 with a second lever 61 connected by a link 62 with a treadle lever 63' at the base of the machine. The presser foot bar 57 isconnected by a lever 32 and link 33 with the thread measuring mechanism whereby the latter is automatically controlled in accordance with the thickness of the work.

The needle or cop thread C passes from the source of supply, not shown, through the thread measuring and clamping mechanism 34, 35,36, thence tending axially through the shaft 51 and supported at its lower end by a bracket 52 on the base 15. From the tube 73 the thread C passes through thence about bottom of the lower portion E of the horn, thence about a pair of guide rollers 65 locatedadjacent the elbow F of the horn, and thence to the whirl 23. The combined takeup and stitch setter 28 comprises a roller 66' which engages the thread C between the uide rollers 65 and is connected by a rod or link 67 with'the free end of a lever 68 housed through a tube 73 ex the wax pot, hereinafter described,

a guide roller 64 adjacent the" within a hollow base portion 69 of the horn, p

said base portion being located between the "1 journal portion 20 and the lower portion E of the horn proper.

lever 68 is pivoted at 70 to a bracket 71 having The opposite end of the y a cylindrical stem portion Q0 which passes U axially through the journal portion 20 of the horn and in which the shaft 51 is journalled, said stem portion having a reduced lower end 91 below said journal portion. 7 The stem por tion 90 of the bracket 71 may lever 68 into position to cooperate withthe link 67 without cramping, and may be secured in adjusted position by means of a clamp 92 engaging the head of and a clamping ring 93 secured byscrews 94 Y be turned in the journal portion 20 of the horn to adjust the the bracket to the lower end of the journal portion 20 and engaging the shoulder formed by the reduced end 91.-

Intermediate its ends the lever 68 is con-,7

nected by a link 72 to a slide 74 guided in the Cf an annular head 75 surrounding and disposed coaxially with the reduced lower end 91 of said stem portion. The head 7 5 is formed with an annular groove 76 which receives whereby avoid cramping of the stud 77 on the end of a lever 78 pivoted at 79 to the base 15 and having at its opposite end a roller or cam follower 8O engaging a path in the periphery of a cam 81 on the vertical shaft 43.

The end of the rod or link 67 is bifurcated to receive the roller 66, and the latter is mounted between the bifurcations upon a stud 82 (Fig. 5) the ends of which are extended to engage fixed guides 83 in the horn,

the roller 66 is directly and continuously guided for rectilinear movement immediately adjacent the thread throughout the thread deflecting movement thereof, so as to parts notwithstanding the pivotal mounting of the lever 68.

T he form of the cam 81 is such that after the shuttle has been passed through the needle loop, the takeup 28 is operated to pull said needle loop over the shuttle and down substantially to the work, this operation being a relatively long and slow one, and is thereafter further actuated to give the thread a short, sharp jerk, corresponding to the snap given to the thread in hand sewing, in order to pull the thread locks into the material and set the stitch. To this end, the path in said cam includes a dwell a, a relatively long, gradual incline b, and a relatively short, steep offset 0.

Carried by the hollow base portion 69 of the horn is a wax pot 84 adapted to contain wax which is kept in hot, fluid condition by a suitable heating device, preferably an electric heater 85. The needle thread C, after leaving the tube 73, passes through a guide 86 secured to the bottom of the lower portion E of the horn, thencethrough an opening in he cover 87 of the wax pot8 l, thence through openings in a guide 88 within the wax pot, thence through another opening in the cover 8?, and thence again through the guide 86 to the guide roller 64. During its passage about the guide 88 in the wax pot, the thread C receives a coating of hot fluid wax. Since the wax pot is located in the horn and there after relatively close to the stitch forming point, this coating of wax remains soft until the thread is used in the formation of stitches, but in order to prevent any cooling or hardening thereof, the portion of the horn through which the thread passes from the wax pot to the stitch forming instrumentalities is preferably heated, which may conveniently be done by suitably disposed electric heating units located between the base and the whirl, and one of which is shown at 89.

Having thus described my invention, I claim:

1. In a lock-stitch shoe sewing machine, in combination, a needle, a shuttle, a horn, a whirl adapted to form a loop of thread about the needle, a single takeup engaging said thread, and actuating means for said takeup adapted to impart thereto first a relatively long slow movement to draw the needle loop over the shuttle and down upon the Work and thereafter a relatively short quick movement to draw the thread looks into the Work and set the stitch.

2. In a shoe sewing machine, a takeup including a link, a thread engaging roller, a stud carried by said link and on which said roller is rotatably mounted, said stud having

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