US2438459A - Sewing machine - Google Patents

Description

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Patented Mar. 23., 1948 SEWING MACHINE Harry Sebell, Marblehead, Mass., assignor of onehalf to Richard Walsh McGann, Lexington, Mass., and one-half to Bell Products Corporation, Boston, Mass., a corporation of Massachusetts Application June 16, 1945, Serial No. 599,878

Claims. l

This invention relates to sewing machines and it has for its object to provide bobbin replenishing means constructed to extract an empty bobbin from the under thread mechanism of a twothread sewing machine and to replace such empty bobbin with a filled bobbin.

A further object of the invention is to provide a bobbin replenishing mechanism which is provided with a magazine for holding lled bobbins and with bobbin extracting means together with devices by which the bobbin extracting element can be actuated to withdraw an empty bobbin from the bobbin case of the under thread mechanism and a illed bobbin can be introduced into the bobbin case from the magazine.

Other objects of the invention will be apparent from the following description of a selected embodiment of my invention.

In the drawings:

Fig. 1 is a side view of my improved bobbinreplenishing mechanism.

Figs. 2 and 3 are similar views showing the manner in which the empty bobbin is extracted from the bobbin case.

Fig. 4 is a top plan View of Fig. 1.

Fig. 5 is a fragmentary view showing the hook element and bobbin case of the under thread mechanism.

Fig. 6 is a fragmentary view showing one means of applying a retarding or braking action to the bobbin for the purpose of securing a proper tension on the under thread.

Fig. 7 is a section on the line 'I-l of Fig. 4.

In the drawings I indicates a portion of the frame of a two-thread sewing machine, 2 is the rotary hook element of the under thread mechanism and 3 indicates the bobbin case which is mounted in the rotary hook element, and which is adapted to receive the usual bobbin 4 carrying the under thread. The bobbin case 3 is open on one side as usual and is provided with a usual axial stud 5 on which the bobbin 4 is mounted and by which it is centered'. The hook element 2 is shown as carried by a driving shaft 8 that is mounted in the portion 9 of the sewing machine frame. The parts thus far described are such as are usually found in a two-thread sewing machine, and those skilled in the art will understand that when the sewing machine is in operation, the hook element 2 takes SHGGSSVSVG looPS of needle thread from the needle of the upper thread mechanism and casts each loop about the bobbin case thereby interlocking the needle or upper thread with the bobbin or lower thread.

In accordance with my invention, I have provided a bobbin replenishing mechanism which includes a bobbin extracting element for extracting an empty bobbin from the bobbin case 5 while the latter remains in the hook, and also includes means for loading a lled bobbin into the bobbin case after the empty bobbin has been extracted and without removing the bobbin case from the hook.

Such bobbin replenishing mechanism includes a magazine I0 which is provided with a chamber adapted to receive a series of lled bobbins 4 arranged in axial alinement, said magazine having a head Il at its outer end from which extends an axial spindle I2 on which the lled bobbins 4 are threaded. Means are provided for supporting this magazine I0 in axial alinement with the bobbin case 3 and shaft 8 and for this purpose said magazine is shown as provided with a supporting arm I3 which extends through apertured bosses I4 carried by a bracket I5 that is secured to the portion 9 of the frame. The bracket I5 is shown as having an upturned end I6 which is clamped to the portion 9 of the frame by a clamping screw I'I. The arm I3 is adjustable in the bosses I4 and is held in its adjusted position by set screws I8. The arm I3 is preferably lat sided as shown in Fig. 7 and the aperture through each boss I4 has a shape to t the flat-sided arm so that the magazine will be rmly held in correct axial alinement with the bobbin case 3. The supporting bracket I5 is also shown as having an ear 2% at its outer end to which is screw threaded a positioning screw I9 adapted to engage a shoulder on the arm I3 thereby to assist in correctly positioning the magazinev with relation to the bobbin case. The screw I9 is shown as having a set nut 2l thereon.

The end of the magazine III which faces the bobbin case is open and in said open end is mounted a -bobbin extracting member 22 which is in the form of a sleeve that can move axially of the magazine I0. 'I'his sleeve 22 isformed at its outer end with a series of bobbin-gripping iingers 23 which are preferably slightly resilient. These nngers 23 are arranged on a circle of a sizejto.

bobbin case, the bobbiniextracting sleeve is moved v forwardly by the handle 24 from position in Fie- 1 to that shown in-Fig. 2, and during such for-` ward movement the fingers 23 enter the open side of the bobbin case and embrace the outer flange of the bobbin d with' sufficient vfriction vgrip .so Y

that when the handle 24 is movedback-wardly vides sufiicient friction between it and the inner face of the hub 32to furnish a braking or retarding action on Said bobbin that is sufcient t0 create the necessary tension on the under thread.

An advantage of making the hub 32 concavo-VV convex and making the finger 33 a curved iinger as shown in Fig. 6 is that such nger not only provides the necessary braking action on the bobbin for the purpose of creating tension on the under thread, but it also serves to hold the bobbin Aon the' stud duri-ng the operation ofthe machine. The Aresiliency of .the linger V33 permits the bobbin to be placedon the stud and as soon as rthe bobbin has been positioned within the vbobbin case 3, the finger 33 springs outwardlyinto its frictional s engagementY with the inside of the hub 32V and thereby-serves to retain the bobbin on the stud.

' It wili'be understood, of course, that it is necesagain as shown in Fig. 3, the -said 4fingers will withdraw the bobbinv from the bobbin case. i

I'he magazine Il! is provided with a follower 27 adapted to engage the last bobbin of the row. of

bobbins within the magazine, said' follower having an arm projecting therefrom through :a slot. di

with which the bobbin-case is provided which arm vterminates in a ng-er piece 28 by which lthe follower V2?!V can -bey moved axially of the magazine l El. The followeris shown as provided with a pawlf-Ze adapted to Aengage ratchet teeth 3i formed on the edge `of the slot 4l, said pawl being held in .en-

gagement with the ratchet teeth by means of a suitable spring 39.

The follower 2'! will be adjusted so asto' mainy tain the end bobbin of the `stack of bobbins substantially flush with the open end of .the magazine asv indicated in-Figs. l andi?.k

When the bobbin extracting sleeve 22 is moved backwardly to withdraw an empty bobbin from the bobbin case 3, such empty bobbin will engage theend lled bobbin in the magazine and as the bobbinfextra'cting, sleeve 2-2 is retractedv into its rearward position, the emptyY bobbinV will be stripped from the fingers .2.3 as shown in'Fig. 3 and will fall by gravity into any suitable receptacle which may be provided' for that purposev Afte1-theY empty bobbinhas been thus extracted from the bobbinccase through its open side,the operator presses. forwardly-on the finger piece 28 thereby/advancing a stack of bobbins in themasazine and loading the end. bobbin into` the bobbin `case through theY same open side thereof.

Each of the filled bobbins l will preferably have a considerable length of thread trailingjfrom it, and when .the sewing machine is started after a `filled bobbin has been loaded into the bobbin case,

the first loop of upper thread which is cast. about the bobbin case will pick up the trailing endof thread from the bobbin and will carry itk into the proper position for forming the stitches thereby obvating any'necessity for manipulating the under threadby hand tov thread up the under thread VVmechanism.

sary tohave-the open side of the bobbin case freeV from any partswhich would interfere with the loading of a bobbin into the case, and therefore,

the usual bobbin retainer that in some machines is pvoted to the .I llli! 1. In a sewing machine the combination with a rotary hook Vand a bobbin case operatively assoend of the stud 5 cannot be used.

ciated `therewith and having 'an open side,v of bob- Y bin-replenish-ing mechanism comprisinga magazine to contain filled bobbins, means tonextract an empty bobbin from the bobbinA case4 through said open side while said case is still perativelyY associated with the hook, and means to load a filled bobbin from the magazine int-o the bobbin case through the same open side thereof.

lIn connection with my improvements, I have provided means for applying the necessary tension'to the under thread by applying a braking or retarding action onthe bobbin 4 within the bobbin case 3. While various-Ways of thus providing for suchretarding action may be provided, Ihave herein YshownY a spring Vfinger S3 which is associated wththe stud 5 and which applies a retarding frictionpto the inside of the huby 32 orY the bobbin; As herein shownJ the hub 32.V of the bcbbinis concavo-convex and the spring finger 3 3 operates through Va s lotl34 with which thestud 5 is provided, The resiliency of the linger 33 pro- 2. In a sewing machine the combination with a rotary hook and a bobbin case yassociated therewith and having an open iside, of bobbin-replenishing Vmechanism `comprising a magazine .open i at one end and adapted to receivea plurality of bobbins arranged in axial alinement, means supporting the magazine with the bobbins therein axially alined with the open side of the bobbin.

case, means to extract an empty bobbin from the bobbin case through said open side while the-bobbin case is still Voperatively associated with the hook, and other means to transfer a lled bobbin fromv the magazine to the bobbin case through the same open side thereof. l s A 3. In a sewing machine the combination Awith a rotary hook and a bobbin case associated therewith, of a magazine open at one end and adapted to receive a plurality of bobbins arrangedA in axial alinement, means supporting the magazine with its open end directed toward the bobbin case and with the bobbins therein axially alined with said bobbin case, a bobbin-extracting sleeve carried by the magazine andmovable axially thereof, said sleeve having resilient bobbin-engaging fingers onits forward end, means to move the sleeve forwardly on the bobbin case to bring said fingers into gripping engagement with the bobbin-in the bobbin case and then to move the sleeve backwardly thereby to extract said bobbin from Vthe bobbin case, and means to transfer the end bobbin in the magazine from the latter to the empty bobbin case. Y l. In a\sewing machine the combination with a rotary hook and a bobbin oase located within the hook and provided with an open side, of bobbin replenishing mechanism Y comprising means to extract an empty bobbin from the bobc 6 same open side while said case still remains with- REFERENCES CITED in the hook.

5. In a sewing machine the combination with a. rotary hook and a bobbin oase located within The following references are of record in the file of this patent:

said hook and provided with an open side, of 5 UNITED STATES PATENTS bobbin-replenishing mechanism comprising a Number Name Date magazine to contain lled bobbins, means to ex- 581,819 Goddu May 14, 1897 tract an empty bobbin from the bobbin case 2 298 871 through its open side Without removing the bobbin case from the rotary hook, and means to 10 load a lled bobbin from the magazine into the bobbin case through the same open side thereof while said case remains within the rotary hook.

HARRY SEBELL.

Gumfer Oct. 13, 1942

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