US1316444A - A cokpobatiomt - Google Patents

Description

T. J. HAYES.

BOBBIN CASE FOR SEWING MACHINES.

APPLICATION FILED JULY 3,1916.

Patented Sept. 16, 1919.

\nvn'for. Thomas J. Hu} es byimd-mu M A'ltys.

UNITED STATES PATENTAOFFICE.

THOMAS J. HAYES, OF ROSLIN'DALE, MASSACHUSETTS, ASSIGNOR TO ARBETTER TELLING MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

Specification 01. Letters Patent.

Patented Sept. 16, 1919.'

Application filed July 8, 1916. Serial No. 107,251.

To all whom it may concern:

Be it known that I, THOMAS J. HAYES, a citizen of the United States, and resident of Roslindale, county of Suffolk, State of-Massachus'etts, have invented an Improvement in Bobbin-Cases for Sewing-Machines, of which the following description, in connection with the accompanying drawing, is a.

specification, like characters on the drawing representing like parts.

This invention relates to improvements in bobbin cases for sewin machines in which the loops of needle t read are cast around the'bobbin by a rotary or oscillating loop taker to form a locked stitch, and is de signed particularly, but not restrictively, for use in a blind stitch sewing machine comprising a curved oscillating. needle and complementary stitch forming mechanism located above the work support.

The general object of this invention is to provide a simplified form of bobbin case adapted to be more quickly assembled, to be more easily threaded, and which will be more efficient in operation than those heretofore produced.

The usual form of bobbin case comprises two separate members, one of which is retained within the hook, and the other member removabl secured thereto by a spring actuated latc pivotally mounted upon a central stud in the member w 'ch is retained in the hook and passes centrally throu h the removable member. In such case t e latch engages the outer surface of the removable member and necessarily presents an undesirable projection.

In case the hook is positioned to revolve upon an axis located substantially normal to a tangent to the path of the needle at the loop taking point as is illustrated in the joint ap lication of Ilayes & Moulton No. 94986, in recess opens ownwardly so that it is di cult to see whether the latch is in open position to receive the bobbincase and the operator will frequently attempt forcibly to thrust the bobbin over an improperli positioned latch, thereby causing a like] 00d of injury to the bobbm' case lockin mechanism or to the bobbin itself, or by ockin the bobbin out of the hand, causing loss 0 time.

One of the ob'ects of the'present inven- 65 tion is to provi e a bobbin case for a roed May 2 1916, the bobbin receivhollow member of the bobbin case, and which may be assembled without careful attention of the operator. Bymeans of the present invention the undesirable projection of the bobbin latch beyond the surface of the bobbin case is also obviated.

Another object of the invention is to provide a bobbin case with a locking mechanism which will normally tend to press tightly together the sections of the bobbin so that proper relation of the parts will be insured and rattling prevented.

Another very important object of the invention is to provide a, bobbin case with a tension device, so constructed and located that it may be threaded by drawing the thread from the bobbin into suitable guldin grooves or slots without the necessity o threadin the end of the thread through eyes having continuous walls, as is necessar. in usual forms of bobbin cases.

'l liis is accomplished in the-present embodiment of the invention by securing the tension device toan axial adjustable stud or screw, the tension device being provided with an extension adaptedto press the thread against the surface of the bobbin case. The bobbin case and tension device areprovided with suitable grooves and slots which enable the thread to be drawn directly from the bobbin into the tension device and thereafter serve to guide the runnin J thread during the operation of the mac e. Other objects and features of the invention will more fully a pear from the following description and the accompanyin drawings, and will be particularly pointed out inthe' annexed claims.

lnthe'drawingsz' Figure 1 is an elevation of a rotary or oscillatory loop taker containing a bobbin case embodying a preferred forn rof my invention. 5 Y r X Fig.2 is a top plan view, and

3' a bottom plan view, of the same.

Fig. 4 is a vertical axial sectional view pmg member.

case with an inclosed bobbin perspective view of the grip- A A preferred embodiment of my inventionis illustrated in the accompanying drawing as supported by a revolving'loop taker or hook 1 mounted upon a hook shaft 2 and provided with a loop engaging beak 3. The wall of the interior of the hook is provided with the usual annular groove 1 to receive a supporting rib on the bobbin case which is locked therein by a usual form of latch 5 pivoted at one end on a, pin 6 and secured at its other end to the heel of the hook by a screw 7 The bobbin case, which is mounted within the rotary loop taker or hook 1, comprises two hollow complementary casing members adapted when assembled to inclose a bobbin. The base member 8 is provided with an annular flange 9 which is seated with a running fit, in the groove 41 in the hook 1. It is also provided with a central cylindrical stud 10, which serves as a spindle for the bobbin, and also is provided with gripping means adapted to engage a cooperating instrumentality upon or secured to the inner face of the complementary bobbin casing member or cap. This preferred form of gripping means illustrated herein comprises a sleeve 11 secured to the stud 10 by a pin 12 and having its end portion slotted longitudinally and inturned to form resilient grippers or claws 13 adapted to engage an undercut, preferably conoidal stud 14: projecting from theinner face the complementary casing member or cap "15. The stud 14 desirably is formed with reversely arranged conoidal surfaces 16 and 17 the former acting to spread the claws 13 when the cap member 15 is thrust into position, and the latter to furnish the undercut surface to be engaged by the inturned ends of the grippers. By reason of this construction the resilient grippers tend always to draw the casing members tightly together, thus insuring proper relation of the parts and preventing rattling. When a bobbin is to be put in it is only necessary to drop it into the cap portion 15 and thrust the latter into place, using only such force as will cause the grippers 13 to pass over the stud 14. When the bobbin is to be removed the cap may be easily detached by pressure of the thumb on a suitable shoulder 15 in the wall of the cap 15.

It will be understood that the locking device disclosed herein is illustrative merely and not restrictive and that my invention includes broadly any form of locking means lnclosed within the casing members.

The base member 8 of the casing is provided with the usual extension 18, which seats in a corresponding recess or cut away portion of the wall of the cap member and also has a recess 20 forming a path for the end of the curved oscillating needle.

The extension 18 has a laterally extending arm 19 adapted to' seat loosely in a recess in the presser foot or some other stationary member of the machine to prevent rotation of the bobbin case" and to ermit the loop of needle thread to be carried around it by the loop taker. The arm 19 in the construction illustrated herein is much longer than is usual in machines of this type and preferably extends substantially to the circumferential path of the beak of the hook and substantially to the plane in which the end of said beak rotates so that the thread carried by the hook engages the arm 19 at a maximum distance from the center of the bobbin case and by reason of the greater leverage will pass more readily under said arm. By thus extending the arm 19 substantially to the path of the beak of the hook the bobbin thread is held out of the path of the hook when it makes its idle revolution even though the tension, if working improperly should leave slack thread which otherwise would loop up into the path of the hook.

In the usual bobbin cases for rotary and oscillating loop takers heretofore constructed the external central locking device for the casing members has necessitated the placing of the tension device for the bobbin thread upon the cylindrical side of the bobbin case. y In such constructions at least two screws were required, one for securing the tension member to the bobbin case and the other for regulating the amount of tension. In the present construction the single screw serves both to secure the tension applied to the bobbin case and to provide means for adjusting the tension applied to impose more or less tension upon the bobbin thread.

In prior constructions the thread has been lead through one or more holes in the wall of the bobbin case to the tension device which was provided with means for imposing fricmost instantly by an unskilled operator, by I merely drawing the thread from the bobbin into guiding slots leading to the tension device. In the preferred construction illustrated herein the tension device comprises a resilient plate 21 preferably having a circular portion seated in a corresponding re-.

member 15 of the bobbin case. The tension plate 21 may be adjustably secured to the case by a screw 23 extending through the plate 21 and cap 15 into the central locking cess 22 concentric with the axis of the cap stud 14. By this construction a smglej e to secure the tension device to the casing and to provide for its adjustment.

The tension plate 21 is provided at one end with an inwardly extending lug and at its other end, which preferably is diametrically opposite said 1 with an extension 25 adapted to press t e thread, which is led beneath the same, against the wall of the bobbin case member 15.

The extension 25 preferably has laterally extending wings provided with thread slots 26 and 27, said extension and wing lymg in a continuation of the recess 22 so that the exterior of the bobbin casing presents an externally smooth surface except for the end 2'5 of the extension 25 which projects slightly away from the casing to facllitate the threading of the tension device.

The wall of the cap portion of the bobbin casing is provided with a slot 28 which extends from its edge obliquely a short distance and terminates preferably in an enlarged circular eye 29. A thread guiding groove or slot 30 cut in, but not through, the cylindrical wall of the cap member 15 leads from the eye to the slot 26 in one of the Wings of the tension device and together with the latter serves to guide the thread properly beneath the extension 25 of the tension plate.

In order to thread the bobbin case and its tension device therefore it is only necessary to draw the free end of the thread into the slot 28 and beneath the projecting end 25 of the tension plate whereupon it will be automatically directed into the groove 30 and slot 26, emerging from beneath the extension 25 at the inner endor eye of the slot 27 so that the entire threading operation may be accomplished by a single sweeping movement of the hand of the operator. By reason of this construction much time is saved in threading the machine and proper threading insured even by an unskilled operator. 4

While the construction herein disclosed is a preferred embodiment of my invention I desire it to be understood that it is not restrictive and that various modifications may be made within the meaning and scope of the following claims.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A bobbin case for sewing machines having a hollow rotating loop taker provided with an annular raceway, comprising complementary hollow cylindrical base and cap members of equal diameter adapted when assembled to form a closed cylindrical chamber for a bobbin, a flange on said base member adapted to enter the raceway in said loop taker and locking means located entirely within said base and cap members for holding said members together, whereby the exterior of the bobbin case will present throughout a smooth surface for the passage of the loop.

2. A bobbin case for sewing machines having a hollow rotating loop taker provided with an annular raceway, comprising complementary hollow cylindrical base and cap members of equal diameter adapted when assembled to form a closed cylindrical chamber for a bobbin, a flange on said base mem ber adapted to enter the raceway, in said loop taker and locking means located entirely within said base and cap members for holding said members together comprising resilient means operating normally to draw the abutting peripheries of said bobbin case members tightly together whereby dust will be excluded from the bobbin chamber and rattling prevented.

3. A bobbin case for sewing machines having a hollow rotating loop taker provided with an annular raceway comprising hollow cylindrical complementary base and cap members of equal diameter adapted when assembled to form a closed cylindrical chamber for a bobbin, a flange on said base member adapted to enter the raceway in said loop taker, one of said complementary members havin a central stud forming a spindle for the ho bin and provided with resilient gripping means and the other complementary member having centrally disposed means adapted to be engaged by said gripping means to lock the casing members together, said locking means being inclosed wholly within said casing members.

4. A bobbin case for sewing machines having a hollow rotating loop taker provided with an annular raceway comprising hollow cylindrical complementary base and cap members of equal diameter adapted when assembled to form a closed cylindrical chamber for a bobbin, a flange on said base member adapted to enter the raceway in said loop taker, one of said casing members having a central stud provided with resilient gripplng jaws and the other casing member aving an internally projecting conoidal stud provided with an undercut beveled portion adapted to be embraced by said gripping jaws, whereby sai d gripping jaws operate to draw the abutting peripheral walls of the casing members tightly together.

5. A bobbin case for sewing machines comprising two hollow complementary members constituting a base member and a cap member adapted to inclose a bobbin, means for locking said members together, a resili- III ent tension plate secured by a screw axially to said cap member and having at one side of said screw a projection engaging said cap and upon the opposite side a slotted extension adapted to engage the thread and press the same against the cap member, and thread guidin slots leading from the interior of said b0 bin case to the thread engaging end of the tension device.

6. A bobbin case for sewing machines comprising hollow complementary base and cap members adapted to inclose a bobbin, the base member being provided with a central stud, a sleeve secured to said stud havin an inturned end longitudinally split to cum resilient gripping members, the cap member.

having a central conoidal stud adapted to be engaged byl said 'grippmg members projectin centra y from its interior.

l A bobbin case for sewing machines comprising hollow complementary base and cap members adapted to inclose a bobbin, the base member being provided with a central stud, a sleeve secured to said stud having an inturned end longitudinally split to form gripping members, the cap member having a central conoidal stud adapted to be engaged by said gripping members and an exterior tension device, and a screw extending through the tension device into the stud in the cap and adjustable to vary the tension imposed upon the bobbin thread.

8. A bobbin case for sewing machines employing a rotary loop taker comprising hollow complementary base and cap members adapted to inclose a bobbin, one of said members being provided with an arm extending substantially to the plane and the path in which the end of the beak of the loop taker travels adapted to cooperate with a stationary member to retain the bobbin case from rotation and to prevent improper catchin of the bobbin thread by the beak of the cop taker.

. 9. A bobbin case for sewing machines employing a rotary loop taker, comprising hollow complementary base and cap members adapted to inclose a bobbin, the base member being provided with an extension adapted to form part of the wall of the cap memher, said extension having an arm extending substantially to the plane and the path in which the end of the beak of the loo tionary member to retain the bobbin case from rotation and to prevent improper.

catching of the bobbin thread by the beak of the loop taker.

10. A bobbin case for sewing machines comprising two hollow complementary members constltuting a basemember and a cap member adaptedto inclose a bobbin, means taker travels and adapted to cooperate wit a sta-.

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