US1870844A

US1870844A - Sewing machine

Info

Publication number: US1870844A
Application number: US115202A
Authority: US
Inventors: Mary F Fowler
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1926-06-11
Filing date: 1926-06-11
Publication date: 1932-08-09
Anticipated expiration: 1949-08-09

Description

Aug. 9, 1932. A. B. FOWLER 1,870,844

SEWING MACHINE Filed June 116 1926 8 Sheets-Sheet 2 /7 HM' a /%W m zmszsixm I Y f wz A. B. FOWLER SEWING MACHINE Aug. 9, 1932.

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SEWING MACHINE Filed June 11, 1926 8 Sheeizs-Sheet 5 1/ 16a 1 166 6 46 Z855 5% 5 (9 flventor fl: 6. Fain/P1; deceased,

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SEWING MACHINE Filed'June 1926 8 Sheets-Sheet 7 16 152 7 56 220 fffzz? .200 y W" 1 20 u." 1 I 4s rm s A. B. FOWLER SEWiNG MACHINE Aug. 9, 1932.

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chines.

sc -of the same mechanisms.

Patented Aug. 9, 1932 FFICE ALFRED B. FOWLER, DECEASED, LATE 015 BEVERLY, MASSACHUSETTS, BY MARY F. FOWLER, ADMINISTRATRIX, OF'BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF new JERSEY SEWING MACHINE Application filed. June 11, 1926; Serial No. 115,202.

The present invention relates to machines for sewing soles to the uppersof boots and shoes and, more particularly to that type known as lock stitch McKay'shoe sewingma- The object of the invention is to provide a novel and improved'lock stitch" machine of the McKay type with particular reference'to the improvement of the mechanisms for han- 1o dling the thread.

\Vith this object in view, the several features of the invention consist in the devices, combinations, and arrangement of parts here,- inafter described and claimed which,.together with the advantages to be obtained thereby,

will be readily understood by those skilled in the art from the following description taken in connection with the accompanying drawings in which Fig. 1 is a side elevation of a ii lock stitch McKay shoe sewing machine embodying the invention. Fig. 2 is a front elevation of the head of the machine. Fig. 3 is a right side elevation of the head of the machine. Fig. 4 is a left side elevation. of

- tlie head of the machine. Fig. 5 is a sectional plan view of the head of the machine taken on the line 5-5 of Fig. 2. Fig. 6 is a detail view in side elevation of the take-up and pulloff mechanisms. Fig. 7 is a front elevation Fig. 8 is across sectional view of the slides for operating the pull-off and take-up mechanisms. Fig. 9 is a detail front view taken on line 99 of Fig. 12 of certain parts of the loop taking hook at! mechanism including the central shaft and its two superimposed sleeves for imparting to the hook its required motions. Fig. 10 is a sectional view taken on the line 10-10 of Fig. 9 showing the shaft sleeves and the bob- -bin case. Fig. 11 is a detail sectional view taken on the line 1111 of Fig. '9. Fig. 12 is a plan view partly in section showing the bobbin case, the hook and its supporting and actuating mechanisms. Figs. 13 to 24 inclu- 'SlVG are sectional views illustrating somewhat diagrammatically the operation of the needle, bobbin case and loop taking hook in forming a stitch.

The lock stitch McKay shoe sewing machine herein disclosed includes a straight hooked needle, a work supporting horn of usual construction to extend within the shoe .and being provided with the usual whirl to supply thread to the needle, and an awl which ismounted on a feed slide and which is operated to perforate the work for the passage of the needle and to feed the work to align the perforations accurately with the needle. The thread handling devices include a bobbin case and a loop taking hook of novel design and a.

clutch and driving mechanism similarto that r disclosed by the" patent to Richardson No.

885,328 and controlled by means of the foot treadle 42.

The awl is adjustably held in a clamp 44 on the lower end of the awl bar 46 which is mounted. to slide vertically in brackets 48 on thefeed slide 50, A pin 52 journalled in the upper end of the awl bar supports a block 54 which isadapted to move in the slot 56 formed in the end of the lever 58 so that the awl bar is at alltimes op eratively connected with the lever during the back and forth movement of the feed slide. The lever 58 is mounted on one end of the rock shaft 60 journalled in the machine frame. In order to turn the rock shaft I 6O and thus cause the awl to move to and from the work the shaft is provided at its other end'with a lever 62 which carries a cam roll 64 to engage a groove in the face of the cam 66.

The feed slide is mounted to reciprocate on horizontal bars 72 fixed to the machineframe and is actuated from the cam 74 on the sewing shaft by means of a lever 7 6 having a fulcrum at 78 on the machine frame and a cam roll 80 to engagea groove in the face of the cam. A sliding connection is V 5 carries also the lever arm 102 with the cam presser foot bar 108 which is adapted to slide provided between the lever 7 6 and the feed slide comprising a block 82 pivotally mounted on the lower end of the lever and designed to move in a vertical slot 84 formed on the rear side of the feed slider WVith this arrangement of the parts it will be seen that the awl is given two positivelines of movement, one to and from the work imparted by; the lever 58 and its actuatlng' mechanism, "and the other backand; forth in the line of feed with the feed slide, this movement being so timed that the awl is moved forward while in engagement with the work and is retracted after the awl has been withdrawn preparatory for punching another hole. v i v The needle is carried on the lower end of the vertical needle bar 86 which is supported by

brackets

88 and 90 on the machine frame. A collar 92 fastened to the bar forms a pivotal support for the parallel links 94 which connect thenedle bar to its actuating lever 96 pivoted on shaft 98. The sleeve 100,

which formsthe hub of the needle lever 96 roll 104 adapted to engage a cam groove in the periphery of the cam 66.

The presser foot 32 is ad ed in a block 106 on the lower end of the in

brackets

110, 112 and 114m the machine frame. The presser foot bar is forced down against the work by means of the spring 116 coiled about the bar between a collar 118 on the bar and the bracket 112, the downward movement being limited by the engagement of the nut 122 on the upper end of the presser foot bar with the bracket 110.

Mechanism for lifting'thepresser foot is provided consisting of acollar 124 loosely mounted von the presser foot bar and containing a, bearing for the cam lever 126 having the eccentric cam surfacei127 adapted to come into contact'with a recessed surface 128 an the. presser foot bar. The collar 124 is normally held in its lowest position resting against the bracket 112 by means of a spring 129 coiled about the presser footbar and inserted between the collar 124 and bracket 110. I The cam lever 126 at its outer end engages the slot'130 in the presser foot lifting lever 132 which is a-djustably clamped to the rock shaft 134 by means of a split hub and the. set screw. 136. 7 Another lever 138 attached to the rock shaft carries a cam roll 140 adapted to ride on the periphery of cam 66. As the lifting lever 132 is raised under the influence of theocam 66 the cam lever 126 is turned about its pivot causing the cam surface acting in con unct1on with V the collar 124 to grip thepresser footbar whichis lifted a uniform distance-against the pressure of the

springs

116 and 129 to disengage the work."

'ustably mount-- At the end of the feeding operation, the shaft 134 is again rocked by the cam 66 allowing the presser foot to be forced down into clamping engagement with the work. A

, locking device is provided to hold the presser foot bar in clamping position which comprises a roll 142 inserted between the inclined surface 144 and a slightly-recessed surface 146 of the presser foot bar and held in yielding contact. with these surfaces by means of the spring plunger 148. In order to'release the locking mechanism preparatory to lifting the presser foot a lever 149 clamped to the rock shaft5150 by a split hub and set screw A 152 is adapted to bear on the upper side of the roll and force it downward against the pressure of the spring'plunger 148. The shaft 150 is rocked for this purpose by means of a lever 153 mounted on the shaft and having at its outer end a cam roll 154 to engage the peripher'y'of the cam 66. A spring 156 stretched between a pin 158 on the lever 149 and a point on the machine frame tends to press the roll 154 against its'cam and keeps the lever 149 normally out of engagement with the locking roll 142,

Thebobbin case 34 is loosely mounted in a holder which comprises an inner guard 160 rigidly secured to the'bracket 161 of the machine frame by'means of two rearwardly pro--- guard is in the proper closed position. A leaf spring 173 secured tolthe bracket 161 extends beneath the bobbin case between thejguard plates and assists in supporting the case and also serves as a means for retaining the loop of needle thread which has-been passed over the bobbin case out of'the path of the do scending needle;

The bobbin case 34, with its guard plates I 160 and 166, is located in'advance of the needle in the direction'of feed and slightly to i the rear, as clearly shown in Figs. 2, 4a'nd' 5. The loop taking hook 36 is mounted so as to rotate bodily througha portion of a revolution? about the bobbin case and its point or beak is arranged to enter the needle loop from the'sideremote from the bobbin case and take remote from the bobbin case and to take the loop directly from the needle and carry it over the bobbin case, the hook is given a bodily axial movement and also a bodily movement transverse to its axis in addition to its movement of rotation.

the loop directly from the'needle. To enable f the hook t'oenter the side of the needle loop The mechanism for imparting to the loop taking hook 36 the required "motions com-1i prises a central shaft 174 having bearings at 176 and 17 8in the machine frame and two

sleeves

180 and 182 superimposedon one another and constrained to turn with the shaft,

and away from. the axis of the shaft. The central shaft 17 4 is turned through an angle suflicient to cause the hook to carry the new loop over the bobbincase by means of a lever 184 mounted on a sleeve 186 on the rock'shaft 66 on the lower end of'which isformed the gear segment 188 to mesh with the gear 190.

on the shaft 1! 4. The-lever 184 is actuated from the cam 7 4 through the engagement of the cam roll 192 on a'lever arm 194 projecting from the sleeve 186 .with-a groove in thefface of the cam;

the shaft while at the same time being allowed a limited movement along its axis by means of a pm 196 fixed in the sleeve and passing,

through a slot 198 in the shaft. yFor moving the sleeve along the shaft a lever 200 is pro vided pivoted on theirock shaft 202 and carrying two rolls 204 on its forked lower end to engage the grooved flange 206 on the sleeve.

The rock shaft has also fastened'toit a lever arm 208. which is 'pivotally connected by a link 210 with one end of a'bell crank lever 212 constrained to turn with the central shaft. and the transverse movement is given a definite direction with relation to the angular position of the shaft, by the engagement of slide-- ways or grooves 220 formed on the sleeve 182 with the guide block 216. .A'bracket222 is fastened by means of four screws 224 to the shdeways 22601 the outer sleeveand carries the loop taking hook 36 which is rigidly clamped to the 'projccting arm 226 of the bracket by meansof a set screw 228. The

inner surface 230 of thexbracket 222 is rec- I tangular, in shape and is adapt-ed to engage a square portion 232 on the central shaft 174 which forms an. additional guiding surface for the transverse movement of the bracket and the outer sleeve 182;

The mechanism for giving the outer sleeve 3 and the loop taking hook a motion transverse needle. (See Figs. 15 and 18.) point the hook is moved transversely to enter tion of the take-up. a

to the axis of the sleeve'comp rises a lever rigidly clamped to a sleeve 234 on the rock shaft 150;and slotted at its lower end to embrace a bearing surface 236 onthe sleeve182. Another lever arm 139 clamped to the sleeve 234 carries a cam roll 240 to engage a groove in the face ofthe cam 74. V

The successive positions taken by the hook 36 during'the cycle of operations are illustrated step by step in Figs. 18 to 24 inclusive. As shown in Fig. 13,.the shaft 174 has been rotated clockwise to carry'the hook to the 4 limit ofits movement-in this direction. Then as the needle withdraws from the work the hook ismoved forward axially with respect to the shaft 174 and transversely away from the axis so that the point of the hook is in a position to enter thenew loop formed by the From this the loop from the side remote from the hook and is then retracted axially and'rotated to The inner sleeve 180 is keyedto turn with take the loop'over the bobbin case. 7

V In the machine herein illustrated the stitch is setagainst a thread lock bythe loop taking hook 36 above described. "A takeup ieem-' ployed to pull the needle loop down part way to the work, and to further facilitate the handling of the thread a pull-off and an addiv tional. thread lock are provided for measure 111g off the necessary thread for each succeeding stitch. The amount of thread pulled from I the supply by the pull-01f is adjusted automatically in accordance with the thickness of the work so that the lock is set always the same distance into the material, and in order thatthe amount of thread drawn around the V workfrom the preceding loop by the needle may be a minimum and constant regardless ofjvariations in the thickness of the work means are also provided for varying the ac- The thread lock against which the stitch is set comprisestwo members consisting respectively of a spring pressed plunger 242 mounted on the bracket 244 on the machine frame and a .clamping plate 246 mounted on the 244. i The lever 248 is pivotally mounted midway

betweenthe clamping plates

246 and 250 upon a pivot 253 in the bracket 244 and is p connected through link 254 to the can actuated slide 256. With this construction, as

the lever 248 is rock-ed one of the thread clamps is opened and the other closed. The

pull-off device is located between the two thread clamps and comprises a fork 258 4' across which the thread'extends as it passes from the supply through the two thread clamps and 'a pull-off plunger rigidly conheated through arm 260 to the camactuated slide 262 and notched at its tip toreceive and bend the thread between thetwo arms of the fork258;

The take-up mechanism comprises the take-up lever .264 mounted. at its lower end on the pivot 253 and carrying the twotakeup rolls'266 vwhiclico-operate with the stationary roll 268 to take up the slack thread.

The-take-up lever is connected by link 270 .to V the cam actuated slide 272.

In order to provide for the automatic adjustment of the pull-off and take up mechanisms in accordance withthe thickness of the work a lever 274 is mounted on the rock shaft 276 to support the stationary roll 268 before mentioned and also carries at its lower end the fork 258 adjustably fastened to the lever by means of slot 278 and set screw 280. The

position of the lever 274 is controlled from the presser foot bar.- through COIlIlGCtlOIlS.

which include a lever arm 282 on therock shaft 276, link 284, a lever 286, vertical conplication filed necting rod 288 and a lever 290.

"The feeding mechanism herein disclosed forms the subject-matter of a divisional ap- Octob'er 15, 1931, Serial No.

569,026. r v i -The invention having been thus described, what is claimed is: r

1. A lockstitch sewing machine having, in combination, stitch forming'and setting devices including a hook needle operating during its. retraction to draw thread from the preceding needle loop, a loop taker, a thread lock against which thestitch is set, a pull-off variable to. regulate the 'supply'of thread in accordance with the thickness of the Work, a

preceding needle loop, a loop taker acting to set the stitch, a thread lock against which the stitch is set,'a take-up acting to pull the needle loop from the shuttle partially back through the work, a pull-off, and means operating to vary the action of the take-up and the pull-off in accordance with the thickness of the work to cause the same length of 7 loop to be left above the work bv the take-up.

8. A lockstitch sewing machine having, in

combination, stitch forming and setting de- 7 vices including a hookneedle operating during its retraction to draw thread from the preceding needle loop, a loopjtaker acting:

to set the stitch, athread lock against which the stitch is set, a take-up acting to pull the needle loop partly back through the work, a

pull-off, and mechanism. controlled by the and the pull-.ofi in accordance with the thickpresser foot to vary the action ofthe take-up ness of the workto cause the same length of loop to be left above the :work by the take-up.

4:. A lockstitch sewing machine having, in

combination, stitch formingdevices including a hook needle, a work support, a bobbin- I case mounted to permit the passage of the? needle loop around it, and an oscillating loop-j taking hook' having additional movements along and transverse to 1tsax1s.:'

5. A lockstitch sewing machine having, in'

combination, stitch forming devices includ- 1ng a hook needle, a Work support, a bobbin case mounted to permit the passageof the needle loop around it and an oscillating hook arranged totake'the loop from the needle over the bobbin caseand having additional movements along and transverse to its axis.

6. A lockstitch sewing machine having, in combination, stitch forming devices including a straight hook needle, a work supporting horn, a bobbin case mounted to permit the passage of the needle loop around it, and a loop-taking hook oscillating about an axis transverse to the line offe'ed and having additional movements along and transversely of its axis. I V

7. A lockstitch sewing machine having, in combination, stitch forming devices including a hook needle, a work support, a bobbin H case mounted to permit the passage of the needle loop around it, a loop-taking hook, and mechanism for imparting motion to the hook comprising a rock shaft, an inner sleeve keyed to slide on the shaft, an outer-sleeve superimposed on the inner sleeve constrained to turn and slide with the inner sleeve and having a motion transversely of the shaft.

8. A lockstitch sewing machine having, in combination, stitch forming devices including a hook needle, a work support, abobbin case mounted to permit thepassage of the needle loop around it, a loop taking hook,

a rock shaft for oscillating the hook, an inner sleeve keyed to slide onthe shaft for moving the hook axially. an outer :sleeve superim-- posed on the inner sleeve to turn and slide with it and having an elliptical bore to permit a motion of the hook transversely to the axis. 9. A lockstitch sewing machine having, in

combination, stitch forming devices including a hook needle, a work support, a discoidal bobbin casemounted inadvance of the needle in the direction of feed-with its axis trans;

verse to the direction of feed, a loop takinghook, and means for actuating the hook to enter the needle loop from the side remote from the bobbin case and carry the loop over the bobbin case; I V f a 7 10. A lockstitch sewing machine having, in

combination, stitch forming devices including a straight hook needle, a bobbin case, a'

loop taking hook mounted to oscillate about an axis transverse to the line of feed and perpendicular to the needle, and means for actuating the hook to enter the needle loop from the side remote from the bobbin case and carry the loop over the bobbin case.

11. A lockstitch sewing machine having, in

combination, stitch forming devices including a straight hook needle, a bobbin case mounted in advance of the needle in the direction of feed, a loop taking hook mounted to oscillate about an axis transverse to the line of feed, and means for imparting to the hook oscillating and axial movements and movements transversely of its axis to cause the hook to enter the needle loop from the side remote from the bobbin case and carry the loop over the bobbin case.

In testimony whereof I have signed my name to this specification.

' MARY F. FOWLER,

Admim'smtm'w 07 the Estate of Alfred B.

Fowler, Deceaae