US1128491A - Sewing-machine. - Google Patents

Description

D. NOBLE.

SEWING MACHINE.

APPLICATION FILED 0GT.30,1913. I 1,12,491 Q Patented Feb. 16, 1915.

2 SHEETSSHEET 1.

WITNESSES: INI/ENTOR Om: 5 W 1W4 72; 0a ;m, WW.

A TTOR/VE Y 1). NOBLE.

SEWING MACHINE.

APPLICATION FILED 0GT.30, 1913.

Patented Feb. 16, 1915.

2 SHEETS-SHEET 2.

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A TTOR/VE Y WITNESSES.-

portion, in connection with DONALD NOIBLE,- OF BRIDGEPORT, CONNECTICUT, ASSIGNZOR TO THE SING-ER MANU- rncrnnme Germany, A.- CORPORATIONOEZNEW JERSEY.

SEWING-MAGEINE.

; Specification of Letters Patent.

PatentedFeb. as, We.

Application filed October 30, 1913. .Serial No. 798,188.

To all whom it may concern:

Be it known that I, DONALD NOBLE, a citizen of the United States,residing at Bridgeort, in the, county of Fairfield and State of gonnecticut, haveinvented certain new and useful Improvements in Sewin Machines, of which the) following is a speci cation, reference beingf had therein to the accompanyin drawings. f

7 his invention relates to improvements in sewing machines; and has for its object to class represented by United States Patent No."480,181, of August 2, 1892, to F. oscillating system.

It is common knowledge that the construction of locli-stitch sewing machine's employing a rotary loop-taker having a cast-01f drawing up the thread-loo and setting .the stitch, it 'is essential to t e action of the take-up that theiloop-taker' be given a variable motion .or a multiple of rotations to .one complete actuation, of the needle, and that in the construction of sewing. machine's employing oscillating looptakers of the cast ofi' variety, as distinguished from the shuttle variety, it is common to locate the mass of under thread eccentric to the axis of oscillation of the loop-taker, so as toeffect an earlier take-up action andthus avoid the necessity of giving the loop-taker a variable motion or a-mnltiple of actuations to one complete actuation ,of the needle, as in the rotary type.

In the present construction applicant has eliected .a stitch forming mechanism of the 'cast-ofi oscillating type which employs the large centrally located bobbin of the rotary type, and in doing so has furnished a stitchforming mechanism .of the cast-oi. oscillating type which can be employed to the same advantage as the rotary typewhenever the latter is impractical of use, as in the Singer type of blind stitchsewing machine and in crank hemstitch .machines employing a stitch-towing mechanism controlled to direct the seam'formation at any angle to the seam lastpforme Dial, V to the a take-up for" the loop taker,

. ing the invention,

- In the employment of loop -takers and bobbin-cases as herein, the flange of the'bobbin-case is provided with a notch oropening located with relation tothe movements of the needle and loop-taker so that when the latter engages the needle-thread loop it carries its inner half or member againstone of the walls of the notch, and in the further oscillation of the loop-taker the inner half of the loop is carried toward the centerof oscillation where it remains during the expanding of the loop, the other half of the loop crossing the outer face of the bobbin-case and finally cast 011' the loop-seizing member of the loop-taker when the take-up-acts to "draw the loop outthrough the vnotch and into the fabric;

For'the reason that the notch is stationary with respect to the oscillating movements of that it enters, and in efl'ecting this it is preferred that the loop-taker be given oscillatory movements of slightly more-than a comthe loop of needle thread mustleave the bobbin-case at the same point plete rotation and its speed slackened at the time'that the loop is being withdrawn from the notch, as in the present construction,

"In the accompanying drawings illusti at- Figure 1 is a plan View partly infull lines and partly in section, of a Singer 'blihd stitch sewing machine equipped with the present invention; Fig. 2 .a perspective'of'the front end portion of the oscillating cylinder .into which is mounted the loop-taker, the throat or needle-plate being shown in dotted lines; Figs. 3, 4 and 5 perspective views of the loop-taker, bobbincase and throat or needle-plate respectively; Fig. 6 anenlarged view of the thread-receiving end of the bobbin-case latch and Figs. 7, 8,9, 10 and 11, views illustrating the relative action of the loop-taker, bobbin-case and sewing thread when forming the stitch. The present invention is shown as applied to a. Singer blind-stitch sewing machine but as it is confined to the construction and ap plication of the stitch-forming mechanism, only such reference will be made to the other elements of'the machine as is deemed name- 6, shown in dotted lines only Fig. 1, mount-- ed in a suitable bearing (not shown) formed in said frame, said stud being held against endwise movement, by nuts, as 7. y

Mounted to move endwise in suitable bearings formed in the cylinder 5 is a needlecarrying bar 8 provided at its forward end with a needle-bracket 9 in which is suitably secured a needle 10, and coacting with said needle is an oscillating thread. carrying loop-taker 11 provided with the usual bobbin 12, said loop-taker having formed integral with it a hollow loop-taker shaft 13 mounted in a flange bushing 14 secured in an opening 15 formed in the cross-head 16 of the cylinder 5.

17 represents a screw-bolt which passes through the base of the loop-taker and through the hollow loop-taker shaft and is threaded into a spirally threaded loop taker oscillating shaft 18, a suitable tongue 18' and notch (not shown) acting to hold the shafts 13 and 18 in given relationship.

19 represents a screw-stud threaded into a suitable bearing formed in the cross wall 20 of the cylinder 5 and secured by nut 21,

the forward end of said stud -being provided with a flange 22 and suitable bearing (not shown) entering a suitable opening formed in said looper-oscillating shaft, and against the inner end of the latter rests said flange.

Upon the crank 23 threaded into, the shaft-flange 4- is fulcrumed one end of the needle-bar actuating connection comprising i an externally threaded connection 24 and internally threaded connection 25, the latter receiving the threaded end of the connection 24 and provided with a bearing 26 in whichis mounted a short shaft 27 having formed integral with it a bearing 28 in which is secured by pinch screw 29 the needle-carrying bar 8. The opposite end ofythe'shaft'27 has formed integral with it a collar 30 provided with a spirally threaded opening 31,

' shown in dotted lines only Fig. 1, which coacts with the spirally threaded looper-osclllating shaft 18 to oscillate the loop-taker.

From the foregoing it is to be understood that the element 27 is provided with integrally formed means for giving to the shaft 18 oscillatory movements, and that through the shaft-flange 4 and connections 24 and 25, stitch-forming movements are transmitted to the needle 10, which, as will be obvious, eoacts with the loop-taker to form stitches.

plate 43.

To effect stitches in different planes, as in meshes with a: gearmember 33 carried by the'shaft 34 and as said gears are of the ratio of one to two, the shaft 34, is given one rotation to two ofthe shaft 2. Upon the end of the shaft 34, opposite to that carrying the gear-member 33, is secured a flange 35 carrying a pin36 havin its axis eccen tric to the axis of said sha t, and swiveled on said pin is a block 37, shown in dotted lines only Fig. 1, which works in a suitable groove (not shown) formed in the extended portion 38 of the cylinder 5, thus transmitting to the latter oscillatory movements for effecting stitches in different planes. .As the cloth feeding mechanism is unimportant to an understanding of the present invention, it is not deemed necessary to refer to it -in detail, and, accordingly, the

elements shown in Fig. 1 forming a .part

of such mechanism are designated by the numeral 39.

40 represents a forward extension of thecylinder 5 to the front edge of which is secured by suitable screws (not shown) passing through the openings, as 41, and threaded into the openings, as 42, the throator needle-plate 43 provided with the needle opening 44 and bobbin-case stop member, the latter comprising the wall 45 of the cut out portion 46, of said needle-plate- The loop-taker 11 is provided with a groove, 47

- the present construction, the main-shaft 2 is provided Witha-gear-member 32 whlch which extends for a short distance into the loop-seizing member 48,'as shown by dotted lines Fig. 3, a part of. said groove being 10- I cated .in the removable loop-taker gib 49, secured by screws, as 50.

51 represents the bobbin-case provided with the flange 52 which in-practice istracked by the groove 47 of the loop-taker, the gib 49 5 comprising convenient means for entering and securing said bobbin-case in said looptaker, said bobbin-case having formed integrally with it the stop walls '53 and 54 which are caused to contact the respective stationary stop- members 45 and 55 by the rever'sing action of the loop-taker, later to be explained.

56 re resents the bobbin-case post provided with a bobbin-retaining latch 57 having thread openings 58 and 59, the needlethread 60 being passed from the supply to the needle 10 in the .usual manner and-the bobbin-thread 61 led from the bobbin 12 to the openings 62, 63, 59 and 58, respectively, to the needle opening 44 in the needle- Referring to Fig. 7 the loop-seizingpoint 64 of the loop-seizing member 48 is shown in its limit of oscillation in the direction indicated by the arrow t or in position to be advanced into the needle-thread loop .65,

ments and during the time that the loop taker is being oscillated back to its posi-- manner 52, thus carrying said member back of the bobbin-case and toward the axis of oscilla tion of the loop-taker, as shown inFig.r. 9.

Inthe further oscillation of the loop-taker,

the front arm 69 of the thread loop is, by the cast-ofl' flange '69 of the .loop-take'r caused to move across the face of the bobbin and bobbin-case to the position shown in F ig. 10, with the arm 66 in substantially like position back of said bobbin-case, when the take-up 70 commencesto draw the loop off the loop-seizing member 48 and through the opening 68 as shown in Fig. 11 and into the material being acted on, and at substantially the time the take-up withdraws the loop out through said opening the needle-bar and loop-taker are caused to reverse their movetion shown in Fi 7, the needle is being advanced to its limit of fabric-piercing movement, as shown in Fig. 1, when subsequent stitch is formed just as described.-

During the time that the loop-taker is being oscillated .-in the direction. indicated by the arrow U, Fig. 8, the stop wall '53 is in engagement with the stop-member 45, .th us andto be withdrawn from said notch during the return movement of said loop-taker.

efiecting an opening between the stop wall 54 and stop-member 55 for the passage of the thread-loop as shown by Figs. 8, 9 and" 10, and when oscillated in the opposite direction the wall 54 is in engagement with the stop-member 55- thus efi'ecting anopening between the wall 53 and stop-member45 for the passage of the loop, as shown in Figs. 7 and 11, and in the present construction-the loop-taker is given oscillatory movements of slightly more than one complete rotation.

From the foregoing-it is to be understood,

that in the present construction of oscillating loop-taker there is employed a stationary central bobbin-case journaled in the looptaker, which latter casts the outer half of the thread-loopacross'the face of the bobbin case while the latter acts to direct the inner half of said thread-loop across the rear side of said bobbin-case, and that dwells occur in the oscillating movement of the loop-taker at substantially the time the loop-seizing point of the latter is entering the threadloop and when the latter is being withdrawn from engagement with the loop-taker, and that the reversing movements of the looptaker effect openings for the free passage of the thread-loop about the bobbinscase,

- In Fig. 7, the character a denotes the po sition of the loop'-seizing point 64 at the completion ofits oscillatory movementm the direction indicated by the arrow t, and

b the position of said point at the completion of its like movement in a direction op- I posite to that indicated by said arrow.

The term stationaryas herein em-- ployed in connection with the'bobbin-casev will be understood to mean practically stationary, the very slight-movement of the bobbin-case, hereinbefore referred to, to

open the thread-passages for the needle-- loops being of such small extent that inthe stationary bobbin-case.

Having thus set forth the nature of the' I invention, what I claim herein is z 1. In astltch-forming mechanism for sew- .ing machines, the combination with a needle, .21 loop-taker provided with a loop-seizing member, 'a cast-ofl' flange and a throat, and a stationary bobbin-case journaled in and upon and concentric with the same axis as said loop-taker. and about its periphery provided with a flange cut away for a portion of its length to provide a notch through which one-half of the needle-thread loop passes, of means for .giving to said looptaker oscillating movements, each oscillating movement being substantially only one complete rotation, whereby; it is timed to In a stitch-forming mechanism for sewing machines, the combination with a needle, a loop-taker provided with a loop-seizing member, a cast-o'fl', flange and a throat, and. a stationary bobbin-case 3ournaled in and upon and concentric with the same axis as said loop-taker and about its periphery providedwith a flange cut away for a portion of its length to provide a notch through which one-half of the needle-thread loop passes, of means including coacting spiral gear members for giving to said loop-taker oscillating movements of sufiicient amplitude to insure that saidloop-taker will not interfere with the inner half of the thread loop entering and emerging from said notch during the formation of the stitch.

3. In a stitch-forming mechanism for sewing machines, thecombination with a needle,

a loop-taker provided with a loop s'eizing member, a cast-ofi' flange and a throat, and a stationary bobbin-case journaled in and upon and concentric with the same axis as said loop-taker and about its periphery provided with a flange cut away for a portion of its length to provide a notch through which one-half of the needle-thread loop passes, of means for giving 'to looptaker oscillating movements of suflicient am- 75 art generally" such bobbin-case is termed plitude to insure that said loop-taker will In testimony Whei'eof, I have signed iny not interfere with the inner half of the name to this specification, in the presence of thread-loop entering and emerging from two subscribing Witnesses.

said notch during the formation of the DONALD NOBLE. stitch and coact-in'g stop elements controlled Witnesses: v v to effect a free passage of the thread-loop WM. A. Famrrrnn,

about said bobbin-case. F. R. Ho rcnmss.

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