US1837757A - Shoe sewing machine - Google Patents

Description

Dec. 22, 1931. A. F. CARLSON SHOE SEWING MACHINE Filed March 31, 1928 2 Sheets-Sheet ZnvenTor. Axel F Cuflson b Qm nb KWzo 1 Dec. 22, 1931. A. F. CARLSON 1,337,757

SHOE SEWING MACHINE Filed March :51, 1928 2 Sheets-Sheet 2' Fig.2.

\n enTor. Axe\ F Zurson X ATTyS.

Patented Dec. 22, 1931 NI ED-STAT S PAT-ENTFOFFICE'F' AXEL FOLKE CARLSON, 0F CAMBRI GE; MASSACHUSETTS, Assre'non TO nnncn snow MACHINERY comamr, or nosrron, MASSACHUSETTS; 'A' CORPORATION or MAINE snonlsnwme MACHINE Application filed March 31,1925. Serial no. 266,421.

V This invention relates to shoe sewing machines, and more especially to the control or .regulation of the thread and the application and variation of tension thereon. Machines of the class to which the present invention is applied are exemplified by the Reece weltand-turn machine whichis a power driven stitching machine in'which the upper of a boot'or shoe is stitched to the lip of the insole, and frequently to a welt strip. Inp I x the right, taken substantially" on the line stances of such machines are those illustrated in patent of Zaleski and Schoenky' No.

1,288,366offDeceit1ber 17,- 1918, and subsequent patents,- such as the patents of J. B. Oliver 1,605,060 of November 2, 1926 ,and

Patent 1,688,938 of October 23, 1928,wherein chain stitches are applied by the use of a curved hooked needle and cooperating instruments. are applicable to other types of shoe or 18311111 er stitching machines.

Th" general ob]ect of the present invenfill the hereinafter following description .of

an illustrative embodiment thereof or will be apparent to those skilled in the subject.

To the attainmentoftherecited objects and advantages the present 'invention consists in the'novel shoe sewing machine, and thread tensionmechanism,..and the novel features of combination; arrangement and structure hereinillustrated or described. 7

" lfn the accompanying drawingsFig-l right elevation ofa su cientpart of a Reece welt sewing machine to illustrate in connec The novel features hereof however is. a-

tion with the other figures the principles of the present invention I t Fig. 2 is a top plan view offthe charac'-' teristic portions of the mechanism. Fig. 3 is a vertical section, looking froms 5 the front, taken substantially on the line .33 of Fig. 2.

Fig. dis a face view of the threadwheelshown in the other figures.

Fig. 5 is a vertical section,

I looking from 5 -5 of Fig. 8. V

"Similar reference numbers are appliedto corresponding parts in theiseveralfigures of the drawings. j Referri'ngto Fig. 1' there is indicated a shoe in sewing position. Surrounding the last Zis the insole s'with its outturn'edlips',

the shoe upper u, and the'welt strip a) being fed andattached by thread t to the upper and.

insole lip. g ,The machine may comprise the usual tall post 9 at the upper endof which is a suitable head or frame including fore-and-aft 7 frame 'walls 10 and 11, beingthetw'o' usual frame 7 walls giving support to the'mechanism of this invention. The stitching shafth13 is shown as turning inthe frame walls inconv unction With other usualjbearings.

The thread-t, which ay com-e'froin a wax 8 0 pot atthe rear passes first to the thread wheel,

'14 around which the thread travels subject to the restraining action of the tension control or device to be described. The thread, from the tension, passesto va takeup lever 15 v and thence to the usuallooper 16 operated to' applyaloop of the wax thread to the barbed point of the needle 17, successive stitches thus being formed, while between' stitches, the Work is fed forwardly by the usualreciproeating feed'point or device 18. ;The shoe is shown held to positionagainsta work rest 1 19, intermittently yieldable, and'itbearsalsoja against a welt guide 20 supported .onfa car {9 rier 21, which 7 also may I :be intermittently yieldable. Above the welt guide and'carrier is shown a'series of inechanical parts for controlling the movements thereof during,

stitching, but these will*not be" described r as herein, as they form no part of the present invention.

Coming now to the tension mechanism, the

preferred operation of; the presentinvention is that two separate resistances to the thread wheel orthread are provided, one quite'heavy andv amounting to a locking action, the other much'lighter, these normally being both in eifect,.but the heavy resistance or friction be- 10 ing. released or removedintermittently, that is atgthe proper pointiin: each stitchqcycle,

while the light tension remains in effect throughoutthe stitching; and the-tension preferably being operated so that at the end of the stitchingynot only the: heavy tension" 7 but the light tension ,i s removed, thus leav- "ing the thread'free to bedrawn from the supply. with the removalofthe work from the machine.

The thread wheel'l l ,hub -turnin'g on. an: axle 26', and the hub 1 carrying also "a friction drum 27 through two separatefriction members or shoes, a

which resistance or friction canibe applied to the thread wheel and thread. 7 I

; Bearing, on the tension drum 27 are shown rear 'friction'shoe herein employed'for the light tension, andafront shoe 31, herein 'shown directly beneath the axle .26.] The. stud 3.3 is supported on a fixed bracket34 as shown in Fig. 3, this being a .portion; of a :and'an upper portion forming a bearing, for part 51.to be described, and-a portion 7 wall 11, as seen in Fig. The rear or light tension employed for the high or heavy tension; each friction shoe having a friction; facing 32. For; convenience both of the friction shoes maybe fulcrumed on the same stud 33 more extended bracket, having a portion 35 which extends around and above the axle 26 37 which is-attached: rigidly to the frame shoe30 is am as applied by a spring, 38, this spring surrounding an interior rod 39' having its rear end threaded to'carry an adjusting nut 40 and a locknut 4:1,bywhich, the spring pressure can be exactly adj usted'to the light ten ,forinedon the :fixedlfbracket' member 37; Thereby the forward end of thetension rod "39' is held stationary; subject to rocking mofThe heavy tension is applied by a front tion, while the rear end carries the adjusting n'u'ts40and4. r

' spring, surrounding'arod 46 carrying at its-freeorfforflward end a nut et'land lock :nut 418,-the rearor inner end of the rod 46 s {having an eye surrounding the fixedstud 42. The .lnuts 47jan'd. 48'will be adjusted to give the desired powerful resistance and heavy tension.

1 The frontor heavy tension shoegl be is shown ashavinga relaxed or released intermittently by means v of a rocker or finger 50, j which is shown mounted on a rock shaft'51 supported in the bracket portion 36. The finger is at the left end ofthe rock shaft and at its right end it carries a hub 52 formed into a rock arm 53 carrying acam roll 54.. These elements shown in full lines in F igs; 2 and 3 are indicatedin dotted lines in Fig. 1 where the rock arm 53 is shown pressed-by ajspring55 sothatthe" cam roll 54 bears against'theiperlphery of a cam 56 mounted on, the stitching shaft 13. The cam is shown as having an eccentric portion 57 allowing the cam'roll to move for 'wardly and thusi apply the heavy tension.

In the position shown in F ig. 1 the heavy tension is inmefi'ect; After a further rotation the eccentric cam portion 58 will come into thus swingthe rock finger 50'to pressforwar'dlythe shoe 31 and thus release the heavy tension. 7 i

effect to lift'thecam roll rearwardlyand The flight orrear tension shoe 30 isarranged to be retracted or released at the end of the stitching of a seam. A pin 60 is shown which takes a doubly curved shape'to clear "located slightly in front of the upper portion of the shoe. This pin is carried onfa lever 61" the adjacent parts and has a hub 62 turning loosely onthe axle 26. The lower extension of the lever 61 is connected'by a link 63 with a 'rock lever 64 turning on a fulcrum stud 65,

the other arm of this ro'ck lever carrying a pin' 66 engaged in the slotted upper'end of a. connecting rod 67 the lower end of-which is pivotedto a collar 68 mounted ona verticallymoving member or rod 69 which may be the-usual pedal rod, or at leastarranged to moveup'wardly whenthe pedal-is let up in the final stoppage of the machine, the slot. between elements 66 and 67 preventing the operation of this train of mechanism until thepedal has been letclear up. The operation at this part of the mechanism. is that afterthe completion of the stitch;

ing thepedal is let up to discontinuethedrive,

' usually to applya stopmotion, and through the elements 61 to 69 caus'es' the rearward f swinging of the pin 60toremove and'relea'se therear or light tension shoe. T Whenthe machine is in the position in which' it comes to'a final stoppage the front or heavy tension shoe will also have beenj withdrawn,

and-thusjalltension and resistance on the thread wheel and thread will havebeen re:

be pulled'fromthemaohine; V

1120" moved, leaving theshoeand thread free to 1 f-There' has thus been described a'shoe sewing machine embodying tension mechanism Constructed and 'operatingin accordancew th the principles l of the present .,}-1 invention.

Since many matters of combinatiomarrangeiment and structure may be variouslymodified 1 7 without departingfrom theprinciples hereof o it is notintended'tolimiti-theinvention 02136 such matters except so far as set forth-in the appended claims.

What is claimed is:

1. In a power driven shoe sewing machine, in combination with the needle and take up and cooperating stitch forming and work feeding means, a thread control means comprising a thread wheel between the thread supply and take up, and a brake drum turning with the thread wheel, a first peripheral brake shoe at one side of the drum for applying intermittent resistance to the thread wheel, a second peripheral brake shoe at the other side of thedrum for applying continuous resistance thereto, said brake shoes being both pivoted at the same side of the brake drum and each having an extension at the opposite side of the drum, with spring means normally acting on said extensions to apply both said shoes to the drum, and timed means acting to remove the first brake shoe at predetermined points in each stitch cycle.

2. In a power driven shoe sewing machine, in combination with the needle and take up and cooperating stitch forming and work feeding means, a thread control means comprising a thread wheel between the supply and take up, and a brake drum annexed there the drum, adjusters therefor, and means operating in each stitch cycle to remove the pressure of the first brake shoe and compress its spring.

In testimony whereof, I have aifixed my I signature hereto.

AXEL F. CARLSON.

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