US2191736A - Take-up for sewing machines - Google Patents

Description

Feb. 27 1940. s. zoNls TAKE-UP FOR SEWING MACHINES Filed Oct. 12, 1937 4 Sheets-Sheet 1 S gn Zonia Feb. 27, 1940. s. ZONlS TAKE-UP-FOR SEWING MACHINES 4 Sheets-Sheet 2 Filed Oct. 12, 1937 Feb. 27, 1940. s. zpms 2,191,736

TAKE-UP FOR SEWING MACHINES Filed Oct. 12, 1937 4 Shets-Sheet 3 3mm WWW Sadr? Zen is Feb. 27, 1940. s. ZONIS 2,191,736

a TAKE-UP FOR SEWING MACHI NES I Fi-led Oct. 12, 1957 4 Sheets-Sheet 4 grvuc/nkm Wwwew I I Zonis N. QM

I mechanisms, and has for its-objective the pro- Patented Feb. 27, 1940 UNITED STATES PATENT OFFICE Singer Manufacturing Company,

Elizabeth,

N. J., a corporation of New Jersey Application October 12, 1937, Serial No. 168,553

36 Claims. (Cl. 112-248) This invention relates to sewing machines and more particularly to sewing machine take-up vision of. an improved form of take-up mechanism for use with a high speed sewing machine and which will effectively control the thread during the stitch-forming cycle.

Another object of this invention is to provide means for preventing thread from winding about the take-up elements.

With the above and other objects in view, as will hereinafter appeanthe invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

Fig. 1 is a rear side elevation of a sewing machine embodying my invention.

Fig. 2 is a top plan view of the machine shown in Fi 1.

Figs. 3, 4, 5 and 6 are left end elevations of the machine with the face plate removed, showing the position of the stitch-forming and threadcontrolling elements at various points in the stitch-forming cycle.

Fig. 7 is a sectional view taken substantially along the line 'l! of Fig. 3.

In the selected embodiment of this invention, l0 represents the bed of the machine from which rises a standard I I carrying an overhanging arm I2 terminating in a hollow head l3. Journaled in the arm [2 is the usual needle-bar actuating shaft M (Fig. 2) which carries a pulley l5 and I is driven by a balance-wheel I6 provided with a belt groove IS.

Journaled in the bearings l1 and [8 carried by the arm [2 and in rear of the needle-bar shaft I4 is a shaft I9 carrying a pulley 20 and journaled beneath the bed It! is a hook-shaft 2| carrying a pulley 22. The pulleys I5, 20 and 22 are all operatively connected by. a single belt 23 and therefore the shafts l4, I9 and 2| all rotate in the same direction and at a uniform speed. The pulley I5 is twice as large as the other two pulleys and therefore the shaft 19 and hook-shaft 2| operate at twice the speed of the needle-bar actuating shaft I4.

Journaled in the head [3 is a presser-bar 24 carrying a presser-foot 25 which cooperates with the usual four-motion feed-dog 26 to advance the work. The mechanism for imparting the fourmotion movement to the feed-dog is old and well known and maybe of any suitable form. Also Journaled in the head I3 is a reciprocatory needle-bar 21 which is actuated from theshaft l4 by means of the conventional crank 29 and link 30 (Figs. 5*and 7). The needle-bar 21 carries a needle 28 which cooperates with a looptaker 3| which may be of any suitable form.

Fixed to the end of the shaft I!) by a set-screw 32 (Fi 'l) is a hub 33 to which a disk 36 is secured by the screw 34 and shouldered stud 35 and the end of-the shaft I9 is reduced to form, in effect, a second stud 31. Fixed to the disk 36 by the pins 38 is a second disk 39. It will be understood that the two disks 36 and 39 are spaced from each other by the washers 40 which encircle the pins 38 and are carried by and rotate with the shaft l9.

Carried by the crank-pin 29 is a member 4| which is concentric with the shaft l4 and has secured thereto by the screw 4| a disk 42 which carries by means of the pins 43 a second disk 44. The disks 42 and 44 are held spaced from each other by the washers 46. 'It is to be understood that the axis of rotation of the disks 42 and 44 is co-incident with the axis of the needle-bar shaft l4 and these disks rotate at the same speed as this shaft.

The thread T is led from the source of supply to a post 41, then to the ironing guide 48, adjustable tension 49, over the check-spring and under guide 5| then to the washers 40 and 46 carried. by the disks and finally through the guides 52, 53 and then through the needles eye.

It is to be understood that washers 40, 46 and stud 35 engage the thread to control it and these elements are hereinafter termed. thread-engaging elements. It will also be understood that the washers 40 and 46 need not be used in pairs, as

shown, but they may be of any suitable shape or size and one or more may be used with each take-up element. I The number and shape would, of course, be determined by the thread require. ments of the loop-taker. I

The guide 5| is carried bya block 54 fixed to the presser-bar 24 so that when the presser-bar is raised the guide 5| will move upwardly. The block 54 also carries an inverted U-shaped member 55 which is adapted to engage the usual pin 56 in order to release the tension on the needlethread when the presser-foot is raised. It will be understood that the presser-bar 24 and presser-foot 25 are urged against the feed-dog 26 by means of the flat spring 5'! which has one end overlying the block 54 and its other end overlying a shouldered screw 58 carried by the acts against one end of the adjusting screw 59 and the usual lever 60 i provided for raising the presser-foot against the action of the spring.

. Assuming theparts to be in the position shown in Fig. 3, the needle 28 has thrown out its threadloop and the beak 62 of the hook is just entering cast-oil point in the stitch-forming cycle the thread-engaging elements 46 have moved slightly more than one-fourth of a revolution and the,

thread-engaging elements 40 have moved a little' more than one-half of a revolution. During this period both thread-engaging elements were givit willbe obvious that the thread-engaging eleing up thread to the hook. In Figure 4 the stud or thread-engaging element 31 has engaged the needle-thread to prevent slack in"the*needle-" thread between the guide 5| and guide 52' ther'eby keeping the thread under controland prevent-' .ing it from whipping about; The studor .threadaengaging element 35 has also engaged the thread.

Fig. 6 shows the position of the parts of the T {the needle-thread and as the element 351s move-g so r "it-to slip forward from the beak of the hook.

ing away from'the element '46 the: combined ac? tion is to'place a tension on the thread and cause in Fig. the stitch-setting point in the cycle is shown. I When the mechanism moves from the position shown in Fig. 4 'to that shown inFigLs 511 .both .of the thread-engaging elements 40 and. 1;

act to pull up the needle-loop and ,set' the stitch.

mechanism immediately after the needlegpoint has entered the material for the succeeding 5 stitch. In this view it will be noted that the, slack needle-thread is between the guide -5|v and ,y the thread-engaging elements on the smaller, or. rear take-up member. Thisis due tothe fact] that the thread-engaging elements operate in a counterclockwise direction thereby causing-the) friction between the thread-engaging elements and the needle-thread to pull the thread away;

This is a distinct adfrom the needles eye. 7 vantage in that it prevents loops of loose needlethread from being thrown in front of and about a slot 65 (Fi 1) of the take-up.

' It has been found that should, for any reason-break during-the operation of the machine, the loose end may be ac- -.cidentally caughtor the thread may be l q ffld' I about one or the thread-engaging elements, and, J 1' "as the machine is operating at high speed, the;

in the operating parts of the take-.upbefore'thefi ma'chinecan be brought to rest. To overcome-3 this diificulty the disk 36 is formed with'a shal low groove 66 (Fig. '7) and to the guard 63 there". "issec'ured a member G'Ihaving a; bent over and, sharpened portion 68' which extends into the,

groove '65. It will be noted that the bent-oven; portion 68 "ls'w'ithin the circle'descrlbedby "the.

thread is wound about and hopelessly entangled 5 movement of the element 40 n thata-it is. dis- 1 placed from the axis of movement of the 'elere'ciprocatory or. vibratory.

standard I I of the machine. The spring 51 rement. This, of course, causes the thread-engaging elements to move towards and away from the portion68. Therefore if the thread should break and the free end is not thrown out by the ,of a sewing machine loop-taker may be satisfied by combining a series of thread-engaging elements which act conjointly or in series on the thread and are caused to execute simple harmonic motions and which engage the thread for periodsof difierent duration during each stitchforming cycle. From the foregoing description ments 46, Ml and 35 are actuated at a uniform velocity andthe duration of the engagement of thethread by'th'ese elements is different for each element; It will also be observed that the thread -is.led"to';-theJthread-engaging elements in series and is "acted on bythese'elements conjointly so ;;a to. satisfy the thread"'requirements of the '.,1 0op'-'t aker.

in will befiobvious that the distances of the hread-engaging elements from theiraxes of op'eration may be varied according to the size and construction of the, loop-taker and that any number of thread-engaging elements ;may 1 be,

used and that they may be operated at different frequenciesthan those shown herein. j

. From" the foregoing description considered in connection with the accompanying drawings,'the

construction, manner of. operation and several advantages of my improved sewing machine will varietyof uses, and it will be understood that the form,- eonstru'ction and arrangement of the elemehtsemployed may be varied. Therefore, the

privilege 'is reserved of resorting to all .such "le'gitimate changes therein as may be fairly em- ;bodied withinlthe spirit and scope of the appended claims. a

{It :will also be obvious that the amount of ments, and also the positions of the thread-guides 4 relative to each other and relative to the take-up the needle. A guard- 63 is fixed to the head Oi-* the machine by the screws 64 and is formed with Also the guide 5!. which is carried by the presser- "bar varies the action of the take-up. elements when the presser-foot is slightly raised due. to'the thickness of the; work under thepr'esser-foot.

. Further it will be understood that the timing of the elements may be varied and that one o r all ofthe elements which-enga e the thread' nay be Having thus set forth the nature tiontwhatI claim'jherein is:

lz'fA take-up for sewing machines 'z'elements. k

-2, A take-up for sewing machines comprising comprising 'a; plurality of cyclically operable take-up ele-- 'jments, and mechanism for rotating. saidelements jabfout their axes, said mechanism including means for causing oneoiysaid elementsto rotate .at'a'difierentfrequency from" the other :of 'said n yhe-cle'arly and fully understood. It is apparent that-such a take-up mechanism has a wide 05" of the inven a plurality of rotary take-up elements operating substantially in the same plane, mechanism for actuating said elements at difierent frequencies andconst nt speeds and means for guiding a thread to s the plane of operation of said elements.

3. A take-up for sewing machines comprising a plurality of rotary take-up elements operable about fixed axes, means for actuating said elements at different frequencies and means to guide a thread'to said elements inseries relation andin the plane of operation of said elements.

4. A take-up for sewing machines comprising a plurality of rotary take-up elements operating about spaced axes, and means for actuating said elements at diflerent frequencies.

5. A take-up for sewing machines comprising a plurality of rotary take-up elements operating about spaced axes and acting on the same thread, and means for actuating said elements at a uniform angular velocity.

6. A take-up for sewing machines comprising a plurality of rotary thread-engaging. elements operable about fixed axes, and means for actuating said elements at different frequencies.

7. In a sewing machine, the combination with a reciprocatory thread-carrying eye-pointed needle and a complemental hook which makes more than one complete rotation for each needle reciprocation, of a plurality of cyclically operable takeup devices for the thread of said needle and means to concomitantlyactuate them at different frequencies during each stitch-forming cycle,

each of said devices acting upon the thread during each of its cycles of operation.

8. In a sewing machine, the combination with a reciprocatory thread-carrying needle, and a rotary hook making a plurality of rotations to one complete reciprocation of said needle, of a plurality of cyclically operable needle-thread take-up devices which act in series upon the thread throughout the stitch-forming cycle and means to operate said take-up devices at the frequencies of the needle and rotary-hook, respectively.

9. In a sewing machine, the combination with a reciprocatory thread-carrying needle and a complemental loop-taker, of a plurality of cyclically operable rotary take-up elements operable about differentaxe s,; and means for actuating said elements at different frequencies.

10. In a. sewing machine, the combination with a reciprocatory thread-carrying needle and a complemental loop-taker, of a plurality of cyclically operable rotary take-up elements rotatable about different axes, and means for actuating said elements at difierent frequencies and at uniform angular velocities.

11. In a sewing machine having a reciprocatory thread-carrying eye-pointed needle and a looptaker coordinated therewith, the combination of a plurality of cyclically operable thread-engaging elements, and means operable during each needle reciprocation for imparting to one of said elements a cycle of operation on the thread of said needle having a certain period of duration and to the other of said elements a cycle of operation on said thread having a period of duration different from the period of duration of the other element, each of said elements engaging the needle-thread simultaneously and during each cycle of operation.

12. In a sewing machine having a reciprocatory thread-carrying eye-pointed needle and a complemental loop-taker, the combination of a d elements in series relation and in.

plurality of rotary thread-engaging take-up elements, said elements being mounted for movement about spaced parallel axes, mechanism ac tuating said elements and means for preventing thread from winding about said elements.

13. A take-up for sewing machines comprising a plurality of rotary thread-engaging elements, mechanism for actuating said elements in differentially timed. relationship, and means for preventing thread from winding about said elements if the thread should break during the operation of the machine.

14. A sewing machine having in combination a reciprocatory eye-pointed needle, a loop-taker coordinated therewith to form stitches, a plurality of take-up elements, said elements acting on the thread simultaneously and conjointly and mechanism for actuating said elements in the same direction and in differentially timed relationship.

15. A sewing machine'having in combination a reciprocatory eye-pointed needle, a loop-taker coordinated therewith to form stitches, a plurality of rotary thread-engaging take-up elements, said elements being mounted for movementabout spaced axes and operating upon the needlethread, and means for rotating said elements in the same direction.

16. In a sewing machine, the combination with a reciprocatory thread-carrying eye-pointed needie, and a rotary hookmaking a plurality of rotations for each reciprocation of the needle, of a plurality of rotary needle-thread take-up devices acting upon the thread in series, and separate means for actuating each of said devices. 17. A take-up for sewing machines comprising a plurality of rotary takeeup elements, mechanism for simultaneously rotating said elements at different frequencies and means for preventing thread from winding about said elements if the thread should break during the operation of the machine.

18. In a sewing machine having a reciprocatory thread-carrying needle and a rotary hook coordinated therewith and making'more than one revolution for each reciprocation of the needle, the combination of'a plurality of cyclically operable needle-thread take-up elements which act upon the needle-thread conjointly through-- out the stitch-forming cycle, and means for actuating said elements at different frequencies r during each needle reciprocation,

19. In a sewing'machine, the combination with a reciprocatory thread-carrying needle, and a rotary hook making a'plurality of rotations for each reciprocation of the needle, of a plurality of rotary needle-thread take-up devices operable about spaced axes and inseries on the thread.

20. A take-up for sewing machines comprising a plurality of take-up elements adapted to move in circular paths about fixed axes and act simultaneously on the same'thread, mechanism for rotating one of said elements, and means for.

22. A sewing machine having, in combination,

a plurality of shafts, means for rotating said shafts about their longitudinal axes, take-up elements carried by said shafts and means for operating said shafts at different speeds.

23. A sewing machine having in combination, a bed carrying a bracket-arm, a pair of shafts journailed in the bracket-arm, a hook actuating shaft journalled in the bed, take-up elements carried by the shafts journalled in the bracket-arm and mechanism for rotating the hook-actuating shaft 7 and one of the shafts journailed in the brackethas arm at the same speed and the other of said shafts at a speed difierent from the speed of the other two shafts. 24. A sewing machine having, in combination, a rotary needle-bar actuatingshaft, a take-up element carried by said shaft, a second shaft, a take-up element actuated by said second shaft and means for actuating said second shaft a plurality of times for each rotation of said needlebar shaft.

25. A take-up for sewing machines comprising a plurality of' circularly moving rotary take-up elements acting simultaneously on the same thread and operable in the same plane," and means for rotating said elements at different speeds.

26. A take-up for sewing machines including a J pair of disks operable about different axes', a thread-engaging element carried by each disk, the element on one Of said disks being spaced a greater distance from the axis'of rotation of its disk than the distance the other element is spacedfromthe axis ofrotation of its disk.

-27. A take-up for lock-stitch sewing machines comprising two rotary shafts, mechanism for rotating one of sa'idshafts twice for each rotation 1 of the other of said shafts and a rotary circularly moving take-up element actuated by each ofsaid shafts, saidelements. being arranged .to, control the needle-thread.

28. A take-up for lock-stitchsewingmachines comprising two shafts, mechanism for actuating one of said shafts twice for each actuation of the other of said shafts, each of said shafts be ingactuated during :each stitch-forming cycle.

and take-up elements 'carriedby each of said shafts. J

29. A sewing machine having, in combination,

a plurality 'ofrshafts, take up elements rigidly fixed to each of said shafts and acting upon the 31. A sewing machine having, in combination, a thread-carrying reciprocatory eye-pointed needle, a rotary hook cooperating with the 1 needle and making more than one complete. rotation for each needle reciprocation, a pl'urality of cyclically operable take-upeIements at least, one of which is rotary, and means for actuating said. I

elements at different frequencies;

32. A sewing machine having, in

a thread-carrying reciprocatory eye-pointed cation, a plurality of cyclicall elements acting upon the nee each stitch-forming cycle, and mechanism-for actuating said elementsduring each stitch-form:

g at the frequencies ofthe hook and; 1 needle, respectively.

ing cycle and .33. A sewing mach ne a bracket-arm carrying a hollow head, a threadombinati'on,

operable take-.upn-

e-thread during. '15

'10 needle, a hook cooperatingtherewit and making a plurality of revolutions for egzlh needle recipro-.'

having; in combination, carrying eye-pointed needle, a shaft journalled I in said bracket-arm for actuatinghsaid needle,

a coordinated; loop t'aken a [rotary jtake up ele- 1 ment actuated by said1needlj-actuatingl shaft, a take-upshaft journalledinsaid bracket-arm; I means for-actuating." said shaft a, plurality rof times for each actuation o'f'ithe needlefand-atake-up element; actuatedbys'aid "shaft,

34., A' sewing machine having in"coinbina- 'tion, a plurality of spaced apart needleg-thread ,controllin elementa means"forfrotating'said ele-' ments aloout a common and a] stationary 'threadbreakingelement'arridby Ithe- .-s ewing machine and-havin g-a portion which extends in; the direction of the axisabout which said, ele-' ts rotatqland located, iiizthezspace between J said elements." a 35.- A sewing inachin for rotatin'g'said elem nt in-anjbifbital path about an axis spaced fromfzsaid' element,- aseco'nd v ha/irisine im nates.a needle-thread controlling i.; 'element,- mechanism .r

. needlegthread controlling element spaced from said first mentioned element, m a for rotating-M 1 said second element in an" orbital path, and a stationary fi-nger havingafportion located the 45 space between said elementsandjwithin the orbit.

described" by saidfirst mentioned (element and 5 -outside of the orbit described by said second mentionedelement, I

36. A, sewing] machine hav ng in combination said element, and formedwi th'agroove, means same thread during each stitch-forming cycle,

said elements being operable in circular paths about-fixed axes, and means for actuating said shafts at uniform angular velocity.

so. A thread take-up for sewing machines comprising a plurality of rotary take-up elements operable about axes and having flxedradii, and means for actuating" said elements at different frequencies' 7 for rotating said disk and a stationary'thread i finger carried by the machinean'd having its free end terminating in a bent over portion which extends into said groove, 'said bent'overportion. being disposed'between the take up element and l the axis about which it'rotates.

, zoNrs.

5o a needle-thread takeup element, adisk carrying r

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