US2298871A - Sewing machine - Google Patents

Description

Filed Nov. 8, 1940 2 Sheets-Sheet 1 sw ww m mm m N x k\. I. Q O

Dorzaid I NN\\\\ Q mm ATTORNEYS t- D. A. CUMFER 'sE W'iR MAGHIEE Filed Nov. 8, 1940 2 Sheets-Sheet 2 h m 8 MA Wm p 2. shuttle. One of these rotatably mounted members 24 preferably and advantageously may constitute the driving member for the shuttle and have formed completely around the periphery thereof gear teeth 25 adapted to engage with complementary teeth 28 formed completely. around the periphery of the rotary shuttle.

Laterally spaced radially projecting peripheral flanges 21 and 28' located at opposite sides of the gear teeth 28, lap opposite sides of the driving member 24 and serve to maintain the shuttle and the driving member in These same flanges 21 and 28, by engaging inwardly offset peripheral shoulders 28 and 38 and by lapping the outer lateral sides of each of the rotatably mounted members 2|, 22 and 28 also serve to support the shuttle and to maintain the latter against any adverse lateral movement.

For mounting, the rotatable members 2|, 22, 28 and 24 there may be conveniently formed to extend downwardly from a top or work plate 88 of the lower arm a transversely disposed supporting section 34 formed with bosses 35, 88, 31 and 38. Stub shafts 38 and 48 in the bosses 38 and 81 serve to directly mount the rotatable members 22 and 23, while an offset arm 4| having a pivot pin portion 42 rotatably mounted in the boss 35 and having a stub shaft portion 48 for rotatably mounting the rotatable member 2| enables the latter member to be adjusted from an inner operative position as shown in Figs. 2,

lateral alignment.

adapted to engage a groove 51 at the outer end 3 and 4 to an outer inoperative position. It a will be readily apparent that by so adjusting the position of the member 2|, the shuttle advantageously maybe either positively maintained in its operative position, or released so that it may be removed, as for replacement, cleaning or repair. A wing screw 44 may be provided'for locking the offset arm 4| and the member 2| carried thereby in the operative position. Axial movement of each of the rotatable members 2|,

22 and 28 on its shaft is preferably arrested, as

by a suitable shoulder, not shown, on each of the shafts and by a holding or end nut 45.

The driving member 24 is fixed, as by a screw 45, on one end of' a rotatable drive shaft 41 i which is supported by the section 84, by a section 48 which like the section 34 may extend downward from the top plate 83, and by a support 48 which conveniently may be formed integral with the sewing machine frame. A suitable driving connection-for the drive shaft may be provided adapted of a stud 58 extending from a supporting plate 59. However, as distinguished from the usual construction wherein the supporting plate is formedintegral with the rotary shuttle, the

supporting plate 59 is formed as an element separate, from the shuttle and forms with the bobbin case proper 55 a bobbin case assembly 88 as a unit to be advanced into position within, the receiving chamber 28 in the shuttle.

As shown most clearly in Fig. '1, when a bobbin case assembly 88 is transferred from the magazine 52 and operatively associated with the rotary shuttle, the supporting plate is releasably locked to the shuttle for rotation therewith in a predetermined position axially of the chamber. by a plurality of circumferentially disposed spring pressed detents 6| supported and guided in suitable bores 62 in the shuttle and adapted to engage in complementary depressions 58 formed in a peripheral groove 54 in the supporting plate 59. Suitable screw plugs 65 in the bores 62 are adapted confine spring elements therein which engage enlarged heads on the detents 5| to yieldingly urge the latter into the complementary depressions 68in the periphery of the supporting plate 59.

With the supporting plate 58 locked in position it will be readily apparent that the entire bobbin case assembly 88 is held in a predetermined position axially of the chamber 28 and relative to opposite ends of the chamber which are initially open to respectively provide 9. bobbin case receiving opening 68 and a bobbin case p lling opening 68.

The telescoping hollow stud 54 and stud 58 connection between the supporting plate 58 and the bobbin case 55 permits relative rotation of these two parts, the bobbin case itself being maintained against rotation by the engagement of a finger 18 thereon in a notch 1| formed in a suitable retaining element 12 which may be suitably secured to the sewing machine frame and is so shaped and supported as to not block the expelling opening 68. The effective lever arm for friction between the hollow stud 54 and stud 58 .isso" small that the pressure exerted between the finger 18 and retaining element 12 is rela-' by an eyeletted belt or chain 58 which passes around a sprocket wheel 5| fixed to one end of the drive shaft and then upwardly through the trunk Hi to pass around a suitable sprocket wheel, not shown, on a drive shaft in the overhanging arm connected to some suitable source of power.

The support and drive for the rotary shuttle, described above is'advantageous and, moreover, it is admirably adapted to have associated therewith the novel magazine feed |8 provided by the present invention.

As shown, this magazine feed l8 includes a magazine or holding tube 52 for receiving a supply of bobbins 58 and directing the same to the receiving chamber 28 in the rotary shuttle.

With the present preferred embodiment of the invention each of the bobbins 53 in the magazine 52, like the bobbin in the rotary shuttle I9, is rotatably mounted on a usual hollow stud 54 on a bobbin case 55 which, in general, may be ordinary construction including a latch ily passrbetween the finger and retaining element in the slightly oversize notch 1| during the operation of the sewing machine and when the needle thread loop 'is engaged in a slot 13 formed in the periphery of the shuttle and extending from one side to the other thereof at an angle to the axis of the shuttle.

A slight cutout 14 in the shuttle at the leading end of the slot 13 provides a thread catching hook 15 for engaging the needle thread and directing the same into the thread carrying slot. A needle clearance slot 15 also is advantageously provided in the shuttle.

In order that each bobbin caseasssembly in the magazine may be properly guided to position in the shuttle with the retaining finger 18 in alignment with the retaining notch 1| and with the bobbin case in position with its needle clearance aperture 11 in alignment with the needle, a guide slot 18 is formed in and to extend longitudinally of the magazine tube. Thus, when a complete bobbin case assembly '58 is inserted in a top opening 19 in the magazine tube, the finger 18 on the bobbin case engages in the guide slot 18 and the bobbin case is guided in a predetermined manner toward the bobbin case -ber 20 while receiving opening 68 01 the amber. Amovable closure plate 80 may be advantageously provided to close an opening in thje work plate 33 through which bobbin case "emblies may be conveniently placed in theppefning 79inl the magazine tube. Preferably andndvantageously this closure plate 80 is made'ctransparent in order that. the number of assemblies in the magazine tube may be readily seen at all times and without removing the closure plate.

To complete the guiding otlitjherespective bobbin cases into a. predeterminedposition withrespect to the shuttle and with thejretaining finger l engaged in the notch" in'fthe' retaining element 12, there is provided preferably flared at the receiving end, in the wall of the chamber, adaptedfto be aligned with the guide slot 18in the magazinetube when the shuttle is in the position-"shownin Fig. 4 with the needle l5 ina conventional, the mechanism," correlating the operation of the needle l5 and of the shuttle is is such that for each complete cycle of needle rotative position i of SI and 48 preas supporting t-he drive shaft as shownmost clearly in Figs. 1 and-4,

. a" guide groove 8| raised position. ,As is.

aligned and touching bobbin case assemblies 'are confined longitudinally ofv the magazine tube between spring fingers 8.1 which may be. advantageously formed integral with the deliveryend With the magazine tube, thus loaded with a supply of bobbinawhena bobbin in the shuttle becomes exhausted :or substantially. exhausted of movement the shuttle willrotate twice and the the shuttle will always bear 25. a definite and predetermined relation to the po- "in the retaining serve as the means for supportingthe magazine;

tube 52 in longitudinal alignment with the bobbincase receiving opening 68 in the chamber and with the deliveryendet! ofthe magazine tube spaced from the shuttle. This spacing ofthe delivery end of: the magazine tube from the shuttle is of irnportance in providing a clearance for the needle thread loop asit is carried around by the. shuttleduring its rotationr For advancing the bobbinsandf their associatedbobbln case assemblies throughthe magazine tube andftowardthe shuttle, {there is, provided,

by the present invention a particularly advantageous and 1 effective plunger 83. Thisplunger 83, whichmay be readily located inposition by rollingjthe same up and, into the magazine tube on. a shelilike portion 84 extending laterally from an open side of the latter and then advancing the plungerto, locate the leading end thereof in the, tube in a position as shown in Fig. 1, includes not only amain section 85 but'also an inner ram outer orsleeve adapted to be moved forwardly a predetermined distance beyond, the forward end of themain section 85. The purpose ofthis inner ram 86, the details, of

' the operation of which will bevhereinafter exan endbobbin plained, is to enable a pushingof.

resting oi the thread, the sewingmachine is operated to, move the shuttle into position with the guidegroove 8| therein, aligned with, the notch "H ,inlth (retainingelement and withthe guidesiot ltlin the magazinetube. Whenthe shuttle is thus positioned a plunger operating, head, orknobv 9i is moveduto advance the'plunge'r from an initial station to animmediately succeeding and pre determined station towardthe shuttle. An armovement of the main section 85 of the plungerin this nextstation iseifected by the engagement of thespring pressed detent 88 in the indexing groove 80b determining this next station. y I 3 However, becausethe operating knob 9| is connected directly to the inner, ram OGandbe-cause the base 9101 the knob is initially spacedrearwardly from thecooperating outer end not the main section 85 of the plunger, the forward end 94 of theram is advanced apredetermmed'distance frorna retracted position determined by the engagement of i a rearwardly facing shoulder 8'! onthe' Iorwardend 9,4, and a complementary forwardly facing inner shoulder 98 on the main plunger section, as showninFigal and 4, to an advanced position beyond the station: determined by the lndexinggroove 80b. The extra, advance ofythe assembliesinthe, magazine tub'e causes the bobbin case-assembly which was initially forwardmost in: themagazinetube to fully enter the chamber 20 in the shuttle, be retained by the detents 6| therein, and to force the bobbin case -case assembly"includinga newbobbin, and the ejection of theassembly including a thread ex- 81 which have hausted bobbin, the spring fingers beenzdistortedforwardlyby; but have not disencase assembly completely into the shuttle 'chamthereinand with the bobbin threads of the respective bobbins properly threaded through and engaged by the usual thread retaining spring fingers of the bobbin cases, the plunger is advanced to an initial station as shown in Figs. 1

at the same time permitting a subsequent return of the next adjacent bobbin assembly from engagement with the delivered asgaged from, the whathas now become the forwardmost assembly inthe supply, act upon this assembly toforce it rearwardlybacl; into the delivery end of the magazine tube from the-position shown in F'ig. 7 to a position, as shownin Fig. 1, spaced from the delivered assembly and the shuttle. This forced rearward movement of the now forwardmost assembly in the supply forces the following assemblies in, the supply rearwardly and the spacing ram 86 thus is pushed, back into itsretracted position in the station determined by the indexing groove b.

A spring 95 located in an enlarged bore 68 and interposed between an inner shoulder 96 on the mainplunger, section and the base 92 of the operating knob may and preierably is provided to supplement the action of the spring fingers 8'! in returning, the inner ram to its initial retracted position with respect to the main plunger and 4. In this station a plurality of successive section as forward end 94 of sidewall lfll' ,operating member T tageously provided :chine irameior turning the gear and advancing 1 theaplunger 83. Y

a within the scope of ,of-the improvements Having thus described the-invention what is claimed-'as new is:

bobbin' expelling opening, opposed to each other; means for receiving a plurality-oi! bobbins and directing the same to into said chamber; and

shown in Figs. 1 and 4 and with the shoulder 91 on the enlarged the ram engaging the complementary forwardly facing inner shoulder 98 on the main plunger section. I a It will be readily .understood'that the advance of successive new bobbins and their associated cases may be effected by merely repeating the operations described above.

\ Ii'de'sired, any suitable mechanical or other rearwardly facing fmeans may be provided for advancing the plunger' 83. One particularly advantageous means ior thus advancing the plunger is shown in Figs. '5--'and 6 wherein a gear rack 89 connected to a" .niodifledoperating head or knob Sin. is

shown-as extending longitudinally oi the plunger and engaging with a mating gear Hill mounted on a-shaft llll extending through a depending of the sewing machine frame. An

I03 on the shai't I] is advanexteriorly oi the sewing m'a- Variations and modifications may be made this invention and portions may be used without others.

1. In a sewing machine the combination of a .rotary hook member for engaging a needle thread-loop, having a bobbin receiving'chambcr thereinswith a bobbin receiving opening and a said openings being saidfireceiving opening in said chamber; and a in a single movement in one dia needle bobbin case receiving having opposed openings; means for receiving a plurality of bobbin cases and directing the same to said chamber; means for releasably maintaining a bobbin case in a predetermined position axially in said chamber; and a single means for, in a single movement in one direction, urging a bobbin case from said receiving and directing means through said receivingopening into said predetermined position in said chamber and for ejecting a' bobbin case initially in said chamber through said expelling opening from said chamber and said rotary hook member.

3.- In a sewing machine having a needle, the

combination of a rotary shuttle having a bobbin case receiving chamber therein with a bobbin case receiving opening; means for receiving and directing a bobbin case to said chamber; means, having a line of movement, for urging said bobbin case from said receiving and directing means guide means on said receiving and directing means and extending in the direction of the axis oi the chamber, toward said receiving opening and in the direction oi. said line of movement, for presenting said bobbin case to said chamber in a predetermined position relative to said needle.

4. In a sewing machine the combination of tional advance of said plunger rotary hook member for engaging a needle thread 100p, having a bobbin receiving chamber therein; means for receiving a plurality of bobbins and directing the same axially into said chamber; plunger means movableinto a plurality of successive predetermined stations, for iorcing bobbins in said receiving means toward said chamber; and indexing means including a movable dete nt, for controlling a 'step-by-step unidirectional, advance of said plunger means toward said chamber in said successive predetermined stations.

5. In a sewing machine the combination oi. a rotary hook member for engaging a needle thread loop, having a bobbin receiving chamber therein; means for receiving a plurality of bobbins and directing the same axially into said chamber; plunger means movable into a plurality of successive predetermined stations, for forcing bobbins in said receiving means toward said chamber; indexing means including a movable detent, for contaolling a step-by-step unidirectoward said chamber in said successive predetermined stations; and means for advancing said plunger means. t

6. In a sewing ma blue the combination of a rotary shuttle having a chamber therein for receiving a bobbin; means for receiving'a supply of bobbins for said shuttle, said receiving means having a delivery end axially aligned with said chamber and spaced from said shuttle; means for urging bobbins in said receiving means towards said delivery end and an end bobbin into said chamber; and means for retracting the bobbin in the said receiving means next to said end bobbin, into said delivery end and spaced from said shuttle after the end bobbin has been urged into said chamber.

'7. In a-sewing machine rotary shuttle having a the combination of a chamber therein for receiving a bobbin; means for presenting a supply of unused bobbinsv to said chamber: means for urging said supply of bobbins toward said chamber; and means for retracting the next to the first bobbin in said supply from said first bobbin and into a position in said presenting means spaced from said shuttle after the first bobbin is urged into said chamber.

8. In a sewing machine the combination of a rotary shuttle having a chamber therein for receiving a bobbin, said chamber having opposed bobbin receiving and bobbin expelling openings; means for supporting and directing an unused bobbin to said receiving opening; and a single means for urging said unused bobbin from said supporting and directing means into said receiving opening and simultaneously urging a used bobbin from said chamber and out of said expelling opening.

9. In a sewing machine the combination of a ro ary shuttle having a chamber therein for receiving a bobbin, said chamber having opposed bobbin receiving and bobbin expelling openings; means for presenting a supply of unused bobbins to said receiving opening; and a single plunger means for urging said supply of bobbins toward said chamber and the first bobbin in said supply through said receiving opening and into said chamber to replenish said shuttle and to force a used bobbin initially in the shuttle from said chamber and out of said expelling opening.

10. In a sewing machine the combination of a rotary shuttle having a chamber therein for receiving a bobbin; means for guiding a supply or bobbin is forced into saidchamber.

ply into a position spaced from said shuttle and ply oi bobbins, having a ing a spacing'element unused bobbins to said chamber; plungermeans for forcing said supply of bobbins relative to said guiding means, toward said chamber; indexing means for controlling a step-by-step advance of said plunger means to sequentially force bobbins from said guiding means into said chamber; and means forretracting the next to the first bobbin in said supply from said first bobbin and into a positionspaced from said shuttle after the first '11. In a sewing machine the combination of a w rotary shuttle having a chamber therein for receiving a bbbin; means for guiding a supply of unused bobbins to said chamber; plunger means for forcing said supply of bobbins relative to said guiding means, toward said chamber; gear bobbins in said supfrom a bobbin forced into said chamber.

serving to-initially advance said bobbins beyond a given predetermined station and in its retract-: ed position to permit a return of said bobbins to said given predetermined station; and means for retracting all or the bobbins, except the bobbin advanced into said chamber, to a position in said magazine spaced from said shuttle.

14. In a sewing machine the combination of a rotary shuttle having achamber therein for receiving abobbin: a magazine for holding a supdelivery end for directing bobbins to said chamber, said delivery end being spaced from said shuttle; plunger means for advancing bobbins from said magazine into said chamber; detent means for arrestingthe advanve 01' said plunger means in successive predetermined stations, said plunger means includ- I movable from a retracted position to an advanced position and back again, said spacing element in its advanced position 75 to said shuttle;

said supply of bobbins toward rotary shuttle said shuttle and said chamber.

16. In a sewing machine having a needle, the combination of a rotary shuttle; a bobbin case having a finger projecting therefrom; means for holding said bobbin case and directing the same means cooperable with said finger for retaining said-bobbin case against rotation with said shuttle when associated there-, with in a predetermined with respect to each other.

1'1. In a sewing machine the combination of a rotary shuttle having a bobbin receiving chamber therein, said chamber having a bobbin receiving opening; means aligned with said resaid supply has ber.

18. In a sewing machine the combination of a rotary shuttle, having a bobbin receiving chamber therein;

ing the latter, at least one of said rotatable members being a driving member; means for holding a supply of unused bobbins and presenting the same to said chamber; means for advancing said chamber; and means for retracting the next to the first bobbin in said supply from said first bobbin and into a position in said presenting means spaced from rotatable members engageable with the periphery of the shuttle and wholly supportshuttle after the first bobbin isnrg'ed into sive predetermined stations toward said shuttle said; chamber, p 7 N v and chamber, said plunger means including a 19; m a sewing nmchirie thecombination of a spacing element having an advanced and a reshuttle a chamber therein for tracted position, for initially urging bobbins bercci'vlng a bobbin; meansifor receiving a supply 5 yond each of said predetermined stations; actuot bobbinsfor said shuttle,said receiving means ating means connected to said spacing element, having a delivery and aligncd with said chamber for advancing said plunger means; and means md spacedfrom shuttlez plunger means for for retracting the bobbin in. said. receiving meansurglr'ig bobbins relative to said rec'ciw' in'g' means next to said end bobbin, into said delivery end. toiard delivery end an end bobbin into 10 and spaced from said shuttle after the end bobsald chamber: means for controlling a step-bybin has been urged into said chamber".

gm "ci'df saidi 'into succea- DONAIDA.

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