US1387141A - Bobbin-winding mechanism for sewing-machines - Google Patents

Description

I. A. FLANAGAN. BOBBIN WINDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED FEB- 4, 1920- RENEWED JUNE 1.1921- Patented Aug. 9, 1921.

2 SHEETS-SHEET I.

Inve nfor J. A. FLANAGAN. BOBBIN wmmm; MECHANISM FOR SEWING MACHINES" APPLICATION FILED FEB. 4. 1920. RENEWED JUNE 11 1921.

' Patented Aug. 9, 1921,

2 SHEETS-SHEET 2- jhl enfor.

' will press againstiit,and gradually move it- J MEs-ALEXA DER FLANAGAMOF rononiro, onTArtio, cAimnA.

Bo 'Bm-w'mnme Mac-Himalayan swims-Machines.

Application filed February-4, 1920, seriaino. 356,202. Renewed Jufi'e 1,1921, seriaim. 474,300.

To all whom it may concern:

Be it known that I, JAMES AhEXANDER FLANAGAN, a British subject, residing at the city. of Toronto, in the county of York and Province of Ontario, Dominion ofCanada, have invented certain. new and useful Improvements in Bobbin-Vvinding Mechanism for Sewing-Machines, and-I hereby declare the following. to be a full, clear, and exact description of the same.

Mypresent invention-relates to a bobbin winding attachment forswingflmachines in: which the bobbin spindle is, mounted in a,

spring-pressed rocker arm, adapted tooscillate between an operative and an inopera-.

tiv'e position; the object of the invention being to provide this attachment with a peas the winding proceeds to disengage the latch from the arm and thereby enable it and its'rel'ated parts to automaticallymove from the operative to the inoperative position.

In carrying out arm is hinged to a supporting member or stationary bracket, preferably forming part of'or secured to the wheel; guard orto some other stationarypart ofthe machine,and is I acted upon by av spring which tends to move it and hold it in the inoperative position. A.

detent or latch is-pivoted to the stationary bracket toenga'ge the rocker arm and. hold I it in the operative position against the tension of the spring, and thisfdetent or latch is provided with 'a .castoff member integrally formed .or rigidly connected with it, the

castoff member, being arranged inalinement' with the thread receiving portion of the bobbin, .so that the thread wound thereon as thewinding'proceeds to disengage the latch from the rocker arm. j .1

For an understanding of the invention Specification of emisr tent; Patented Au i 9,1921.

reference is to be had to' the following de sc'ription' and to the accompanying drawings, in which:

Figure 1, is a Sldfl elevationa'l view of the' flywheel, wheel guard and the bobbin winding" mechanism showing the detent or latch engaging the rocker arm and holding the friction wheel in contact with the flywheel,

Fig.2, is a similar viewtoFig. 1, showing the position of the parts when the detent has'released the rocker arm,

Fig. 3, isa top plan View of the parts in the same position as shown in Fig. 1,

Fig. 4, .is' a front elevation'al view ofthe parts in the same position as in Fig.1,

Fig. 5, is a" detail view of the rocker arm, I

Fig. 6, is a detail view of the detent er latch, and

Fig. 7, is a detail View of the" su porting. member. I I Like characters of reference refer to like parts throughout the specification and} drawm e.

it represents theusual flywheel of the'sew ing. machine-mounted on the shaft b, and 0 represents the usual wheel. guard for the flywheeL- At the-side of the wheel gu'ard c is a supporting member which is shown iii I the drawings to take the form of a bracket the invention the rockeror arm cl, inclined downwardly-forwardly beyond the wheel guard 0'. Thisbracket or arm d is. preferably secured tothewheel guard at by'two bolts 6-, e, thelower bolt e,

being the nearer one of the two to the pef Near the outer end of screw threadedyshank of a stud i1 Encircling the stud i is the cylindrical hub y' of detent'g herein-v the bracket or arm a (Z is a screw threaded hole It, to receive the the rocker arm is, and'within the. hub j is a coiled spring Z, one end ofwlii'ch is anchored to the hub j, andthe other end m of which is extendedbeyond the coils and anchoredbetween two pins 0 projecting from the adjacentside of the bracket or arm" d;

This arrangement enables the spring to press the rocker arm 70 in a direction outward from the flywheel, and move it to what may be termed its inoperative position.

At or near the free end of the rocker arm 70 are spaced bearings 79, p, and journaled in these bearings is the bobbin spindle g, on the outer end of which is fixed a friction wheel 9 to engage with the flywheel a.

Mounted on the bobbin spindle Q between the bearings 7), 7), is a worm 1" of such proportions as to fill the space between these bearings and contact their opposed faces. This worm rotates with the bobbin shaft 9 and meshes with a worm wheel 8, journaled on a stud 75, secured to the rocker arm is.

- On the worm wheel .9 is a cam M, which engages with. an arm 1) of the thread distributer w.-

At the junction of the thread distributer w and arm '4) is a lug 00, and passing through the lug m is a stud 3 which enters a cylindrical lug .2, forming part of the rocker arm 70. Within the cylindrical lug z is a coiled spring a, one end of which is anchored within the cylindrical lug z, and the other end of which is anchored to the thread distributer to, so as to maintain the arm 11 continually in contact with the periphery of the cam u.

During the revolution of the bobbin spindle g, the worm r meshing with the teeth ofthe worm wheel 8, causes the revolution of the latter and the cam m. This .cam is so timed as to gradually and slowly move the thread distributer 'w in a direction toward the flywheel, and then when it has moved the distributer to its limit of motion in that direction to permit of the spring a graduallymoving the thread distributer to its limit of motion in the opposite direction, the thread distributer thus passing across the face of the bobbin 7) alternately in opposite directions at each revolution of the cam to dis tribute the thread evenly across the face of the bobbin.

The bearing p is alined with the detent g and is provided with a flattenedsurface p to be engaged by the detent. The detent as shown in the drawings overlies the top of the arm and is formed with a hook shape-d end 7, which engages with the flattened surface 39 and holds the rocker arm in its operative position and maintains the friction wheel 9' wheel a; I

Extending from the hub f is a castofl arm 9, which overlies the thread receiving part of the bobbin Z2 when the bobbin is mounted on the bobbin spindle as shown in the drawings, the free end of the arm g being curved upwardly to provide a clearance for the thread distributer to, when the parts are in the positionshown in Figs. 1 and 4.

The detent g and the castofl' arm g are in contact with the flyin the same transverse plane and the flattened surface 10 of the bearing p is of such height as to permit of the arm 9' entering between the flanges of the bobbin before the thread is wound thereon. As the bobbin fills during the winding operation the thread comes into contact with and presses against the arm 9, and gradually moves it outward as the winding proceeds. This arm is preferably integral with the detent g and its hub f, and as the winding proceeds it unitedly lifts with it the detent g, the lifting continuing until the thread reaches the periphery of the bobbin flanges. I

At this point the arm .9 and the detent are raised sufliciently to release the hook ment with the bearing 0. The spring Z then moves the rocker arm forwardly to its inoperative position, and the friction wheel is then free from contact with the flywheel.

In its operative position the rocker arm is assumes a perpendicular or substantially perpendicular position with the friction wheel in contact with the flywheel a, and the detent g lying loosely on the top of the bearing 39 and the hook shaped end f" engaging the flattened surface 10'.

When the thread winding upon the bobbin raises the castoff arm 9 and detent sufliciently to disengage the hook shaped end f" from the bearing p,the rocker arm,under the influence of the spring Z, turns on the stud z and the friction wheel moves outwardly and forwardly from the flywheel until the forward movement of the rocker arm is arrested by the stop 0' on the hub j engaging with the spring Z.

A convenient method of forming this stop is to recess the cylindrical wall of the hub '7', as shown in Fig. 5, the recess being of sufficient length to permit of the free movement of the hub during the rocking of the arm.

Having thus fully described my inven tion, what I claim as new and desire to secure by Letters Patent is: I I

1. A bobbin windin mechanism for sewshaped end 7 of the detent from engageing machines, comprising a supporting member, a spring pressed rocker arm pivoted to the supporting member having bobbin spindle bearings, a bobbin spindle journaled in the bearings having a friction wheel adapted to engage the fly wheel of the machine, a pivoted detent engaging one of the bearings and holding the friction wheel in contact with the fly wheel, and a cast off arm for the detent adapted to be engaged by the thread wound on the bobbin for releasing the detent from the bearing as the winding proceeds.

2. A bobbin winding mechanism for sewing machines comprising a supporting member, a spring pressed rocker arm pivoted to die bearings, one of which has a flattened detent engaging surface, a bobbin spindle journaled in the bearingshaving a friction Wheel adapted to engage the fly Wheel of the machine, a pivoted detent engaging the flattened surface of the bearing and holding the friction Wheel in contact with the fly Wheel,

and a cast off arm for the detent adapted to be engaged by the thread Wound on the bobbin for releasing the detent from the fiat-"10 JAMES ALEXANDER FLANAGAN: Signed in the presence of-- CHAS, H. RIoHEs, W. J. GILOHRIST.

Ontario, October 28th, 1919.

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