US927993A - Bobbin-thread controller for sewing-machines. - Google Patents

Description

in. MILLS. BOBBIE THREAD CONTROLLER FOR ,SBWING MAUHINES. APPLIOATION FILED NOV. 24, 1896.

Patented July is, 19.09.

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- D. MILLS. BOBBIN THREAD CONTROLLER IOESEWING MACHINES.

Arruoulox FILE]? 19v. 291m.

Patented July 1 3,; 1909.

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D. MILLS.

BOBBIN THREAD CONTROLLER FOR SEWING MACHINES.

APPLICATION Hum NOV. 24, 1896.

927,993... Patented July 13, 1909.

4 SHEETS-SHEET 3.

WITNESSES: INVENTOR BY gawbwcffw v QD LMRREM J; ATTORNEY News Fun t n. MILLS, 301mm THBEAD'GONTEOLLEB r B-snw'mq mcnmns. APPLICATION FILED NOV. 2Q, 1:896;

927,993. mm July 13,1909.

4 SHEETS-SHEET 4.

WITNESSES: v I INVENTOR- .,g: u b BY W b2 %M a; ATTORNEY UNITED STATl E S A rE T orrioa DANIEL MILLS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THESTANDARD SEWING MACHINE COMPANY, OF OLEVELAND, OHIO, A CORPORATION OF OHIO.

BOBBIN-THREAD CONTROLLER FOR SEWING-MACHINES;

Application filed November 24, 1896. Serial No. 613,325 l T all whom it may concern:

Be it knownthat I, DANIEL Mums, a citi- I yzen of the United States,residing in Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Bobbin-Thread Controllers for Sewing-Machines, of which the following description,

' taken in connection with the drawings herewith'accompaiiying, is a specification.

My invention relates'to that class of sewing machines employing a rotary or oscillating looper for carrying the needle-thread loop around abobbin to interlock with-the under or bobbin thread. In machines of this class it iscustomaryto provide a means of some character for acting upon the bobbinthre'ad to draw off a sulficient length of the same from the bobbin as may berequired for each stitch, and it has been the object of my present invention to provide a simple and effective means for so acting on the bobbinthread and which preferably will be capable of adjustment for re ulating the amount of 7 thread drawn from the bobbin according to 5 the thickness ,of the material being operated upon or the character of the work being performed. I

-To this end the invention consists in the novel features .of construction and combina- 3 ,tions of parts as. hereinafter set forth in' detail and pointed out in the claims.

Referring to the accompanying drawings,

Figure 1, is a perspective end view of a machine embodying my invention, certain of the parts'located beneath the becl platc being shown in dotted lines. Fig. 2, is a side ele vation of the front end of the machine, with the bed-plate, shuttle, and shuttle-casement in section to-more clearly show. the several 0 parts, and also the action of the same upon the thread ata certain time during the formation of a stitch. Fig. 3, is a bottom view of the front end of the machine, with the shuttle and shuttle'casement removed. Figs.

45.4 and.5 are enlarged detail views showing the position of certain parts of the thread controller mechanism at dilferent times dur- .ingthe (r pe-ration of the machine.

To explain indetail, the head apofthej ma- ,0 chine. the rotary shuttle or looper a the 'lgbliiJlli-llfildQI a, the rotating driving shaft at, the shuttle driver cc", the presser a, the needle (1, the ,takeTu-p and the tensiondevice. ((9, are .alliof the usual and well known construction as found in the Stand- Spec'ification of Letters Patent.

one end thereof bearing against the le understood that the controller If is in thep se ed July 13,1909.

ard sewing machine, to which, herein illustrated, I have applied my invention According to my invention, Ishave pro; vided a. thread-controller, consisting- 15,551 sliding bar I) which is supported to operate "5 on the under side of the bed-plate of. the Inachine, with oneend thereofarrangedtare: ciproc'ate across the path of theJneedle in fa position immediately" beneath theTthroat M plate and between the latter aiidyih shiai e '5 with its containedbObbin-caSe and, bobbin, which end is provided ,with an elongated slot or opening'b therein throughwhich, the thread is passed as willaherei-nafter beidej; scribed. The said slottedendiof the bar 1?), n as herein shown, rests upon the upper s ii face of the shuttle-race frame 0 within: a groove 0 therein as shown by dottedlinesin Fig. 1, within which groove the s'aid slotted or thread-engaging end of the bar I) isv sup- '7 ported and guided. [The reai'or opposite end of the bar 2) has a hingedconnection. with a pivoted lever cl, which latter, here; in shown, is arranged at substantially right angles to the driving sliaftj a" and is pivot:

ally secured at one end to tlie under side 'of the bed-plate at (Z. This leverdfisf provided with astud having an anti-friction roller (Z thereon which is. adapted to be engaged by a cam e locatedupo'n "thedrivin'gg5 shaft a, from which the levertl is cau'sed'to receive a vibrating movement and thereby give the connected threa(l-controllerban 7) a ongitudinal reciprocating lllXfVQln M l t.

The barbismovablyheldinanormal' tion with the slot 7)"therei'n iii'tliepa'tl needle as shown iiiFigs, 1 and 3, 1 of a fixed stud b secured oirthe undrjgside of the bed-plate, against which oneflendff the lever (Z is yieldingly li'eltlby aspi'ing id. 91:.

The latter is supported upon ajpostldfly th as shown. By this arrangement o ftfpl the bar. Z) is "moved positively in one tion by the'c'am c wheiijdrawingthe tli from the bobbin as will be described, 7 returned to its normal position "by" he spring 0Z .v r f;

The operation or action ofgthe'controllef b relative to the movements ofthe cd-atiiig1'05 parts of the stitching mechanismfi's lows: In taking tlie first stitch,

sition shown in Figs. '1 and 3"to a'llow for the passage of the needle through the-o en 110 ing jtherein) the needle passes downward through the openin b in the controller 6, and, when the need e-thread loop has been carried'around the bobbin by the shuttle and drawn up by the take-up in the usual man-' her, t also carries the bobbin-thread up through the said slot in the controller; After the bobbin-thread,represented at 2, has beenfi thus passed upward through the opening in the controller 6, and through the needleeopening f in the throat-plate; at each succeeding stitch,the needle descends through well above the same, during which time the v the action of the controller.

needle-thread loop, represented at- I, has been carried around the bobbin by the shuttle to a position as shown in Fig. 1, Where it is cast off by the latter to be drawn up by the take-up, at which time, the controller [2 begins to be moved backward by the cam e, as shownin Fig. 2, (which'view shows the controller in a position at the limit of its back ward movement) and draw a certain regulated amount of thread from the bobbin, it being understood that during such move ment of the controller to. draw the bobbinthread off the bobbin, the needle-thread is in a slack condition and being drawn up by the take-up, and consequently is not affected by After the controller has drawn off the desired amount of thread from the bobbin, it is then returned to its normal pdsition under the action of the spring d before the., take-up hasreached the limit of its upward movement, so as to present the bobbin-thread in a slack condition to the upper thread and allow it to be drawn regulated to draw off more or lessthread from the bobbin, according to the thickness of .the material being operated upon or the character of the WOlK being performed, by adjusting the position of the cam e longitudinally upon the shaft a, by means of a setscrewefl'whereby said cam will be caused to move the lever'd and thereby the connected controller Z) a greater or less distance. The necessary length of under or bobbin thread required for any desired length or character of stitch being thus drawn from the bobbin and given in a slack condition to the upper thread, so that it may be drawn through the goods by the latter when acted upon by the take-up, without any undue strain on said upper thread, enables the operatorto perform varied kinds of work upon goods of difierent kinds and thicknesses with the best results, and is especially desirable in buttonholing when the operator wishes to adjust the stitch for making different Widths of bight on the sides of the button-hole.

In order that the lever 05 may always be able to assume its normal position against the stop-pint for the purpose described, the actuating portion of the cam e is preferably made of such size as to allow for all desired adjustments to the movement of the lever, without bringing the flat face surface of the cam into contact with the roller. manner a space is secured betweenthe roller In this,

b and the flat face portion of the cam as connected thread-controller, is regulated according to the distance which the actuating portion of the cam projects beyond the flat face portion as will be obvious, and this adjustment may be varied by moving the cam longitudinally upon its shaft relative to the roller, as hereinbefore described.

In some instances, in lieu of the face-cam as illustrated in Figs 1, 2, and 3, I employ a grooved cam as shown in Figs. 4 and 5, which latter figures show enlarged views of a portion of the driving-shaft with a grooved cam thereon, and a portion of the thread-controller mechanism in dotted lines, illustrating the relative positions of the several parts when the lever (Z is in its normal position against the stop-pin and when moved therefrom, respectively. The width of the groove of this cam is greater than the width of the roller, as shown in Fig. (i, so as to allow for the adjustment of the cam relative to said roller as hereinbefore described, and also to allow the roller to move independently of contact with the opposite walls h, h, of the cam except at such time as the actuating portion h of the latter moves into engagement with the roller as shown in Fig. 5, which latter figure shows the position of the cam after having taken a half-turn from the position in-E 1g. 4. The width of the groove at the point of greatestwidth of the cam it however, is only sufiicient to allow for the passage therethrough of the roller as shown in F1g. 5, thus preventing said roller, and thereby the connected controller mechanism, from receiving a greater movement than that for pa aces a which the cam 1s regulated to secure. Such a grooved cam, forming a positive means otherwise the. tension of the sprin bv is liable to be overcome sufficiently by t 1e sud den contact of Ithejordinary face-cam with the roller d,-asto-al1ow the thread-controller to be thrown'beyond the required regulated distance.' S'uchexcess movement however is prevented/b. I Having tli arra ement of the means for operating said contro ler, or the particular character of the stltehing mechanism as herein illustrated and described, as it willbe obviousth'at the with the needle, a bobbin, and a looper, of

a bobbin-thread controller having means for en ging the bobbin-thread, meansmovably ho ding said controller in a normal stationary position, means, independent of said. holding means, for operatin the controller ositively to draw the threa from the bobin, and means for adjustingthe throw of said controller, for the purpose set forth.

2. In a sewingmachme, the combination,

the grooved cam as described. 1 us set forth 'one practical einbodiment-of my invention, I do not wish to be understood as being confined to the particular form or arrangement of the'con; troller b, or' the particular construction'oi' With the needle, a bobbin, and a looper, of

a reciprocating bobbin-thread controller.

the bobbinhavin means for: 'engagin threa means movably hol mg and controller 1n a normal statlonar pos1t1on,

means, independent of said=hol in means;

for operating the controller positively to draw the thread from the bobbin, and' means for adjusting the throw of said controller,

forthe purpose set forth.

,3. In a sewing machine, the combination, with the needle, abobbin, and a looper, of a bobbin-t read controller having means for engaging t ho ding sal controller in a normal stationary position, and a rotating shaft having a cam thereon for operating the'controller to draw the thread from the bobbin, said'cam bein adjustable onits shaft, for the purpose set orth. Y I

4. In a sewing machine, the combination, with the needle, a bobbin, and a looper, of a. reciprocating bobbinthread controller havin q means for engaging the bobbinthrea a lever connecting with said controller, means movably holding'said lever and connected control er in a normal stationary position, and a rotating-shaft having a cam thereon for. operating said lever and connected controller to draw the thread from the bobbin, said cam being adjustable .50 i bobbin-thread, means .movably

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