US2733868A - Bobbin winder for sewing machine - Google Patents

Description

Feb. 7, 1956 s. .1. HAMLETT 2,733,868

BOBBIN WINDER FOR SEWING MACHINE Filed June 50, 1954 \M NJ INVEN TOR. 570mg) J/Mmurrr nited States Parent 2,733,868 nonnmwmnnn FOR SEWING MACHINE Sidney J. Hamlett, Parma, Ohio, assignor to White Sewing .Machine Corporation, Lakewood, Ohio, a corporation of Delaware Thepresent invention relates to sewing machines and more particularly to bobbin-winders for sewing machines.

It is an object of the present invention to provide a new andjmproved bobbin winder which will automatically stop itselfafter a predetermined amount of material is wound upon the bobbin. I V

'It is a furtherobject of the present invention to provide a new and improved device of the above type which can be placedinto its operating and/ or non-operating position with a minimum ofeffort and attention by an operator.

It is a more particular object of the present invention to "provide a'new'and improved device'of the above type which utilizes a spring to 'urge the device into both its 'operatingand non oper'ating positions.

"j'The invention resides in'certain constructions and combinations and'arrangements of parts and further objects and advantages will be apparent to thoses'killed in the art to which it relates'froni the following description of the preferred embodiment described withreference to the accompanying drawings forming a part of this specification, in which;

Fig. l of the drawing is a side elevational view of a sewing machine embodying the present invention and showing parts thereof in section;

Fig. 2 is an end elevational view of Fig. 1.

Referring to the drawing, a bobbin winding device embodying thepresent invention is shown mounted on a sewing machine head 10 which carries or has mounted thereon a handwheel 11 rotatable by the driving mechanism of the sewing machine as is well understood in the art. A boss 12 on the end surface of the base structure 10 beneath the handwheel 11 is drilled and tapped to received machine screw 14 which serves as a pivotal connection for the bobbin winding device 20 of the present invention.

The lever arm 21 of the device has a hub 22 at its lower end which is drilled and counterbored in a manner permitting the hub to be pivotably connected to the sewing machine base by means of machine screw 14. The other end of the arm 21 is adapted to extend adjacent the handwheel 11 of the sewing machine and terminates in a bearing boss or sleeve 23 which is adapted to journal a bobbin driving spindle 24. A rubber-tired friction wheel 25 is fixed to the spindle 24 on one side of the hub and a collar 26 is secured on the spindle 24 and is positioned adjacent the other side of the hub 23 to hold the spindle against axial displacement during its rotation. The rubber-tired frictional wheel 25 is adapted to rest against the surface of the handwheel 11 when the arm 21 is swung into its upper operating position adjacent the handwheel 11 and the other end of the spindle 24 is adapted to frictionally retain and drive a conventional sewing machine bobbin B.

Too

moved to the opposite side of the predetermined position. As illustrative of one form of spring means that can be utilized, spring 27 is shown in the form of a U-shaped compression spring having one end pivotably anchored in hole 28 of the lever arm and the other end pivotably connected to the sewing machine head by means of 'a loop about the enlarged shank portion 29 ofa pin 30. The thread portion 31 of the pin terminates short of the enlarged shank portion 29 and prevents the loop of the spring from being clamped between the sewing machine head and the head 32 of the pin.

Spring 27 may be of various sizes and shapes. To increase the flexibility of the U-shaped-spring shownin the drawing, one or more coils are provided at thebottom or bight of the U of the spring. Hole 28 and pin 30 have been so positioned and the spring 27 -so arranged that the lever arm 21 will be forced by the springaction into its inactive position adjacent the stop S when the arm is moved counterclockwise manually from substantially an operative position to just below the line CC shown in Fig. 2 and then released. Conversely, when the arm is moved clockwise manually from its inactive position just past or upwardly of the line C--C and then released, the spring thereafter automatically forces the arm into its operating position.

Attached to the sewing machine base is a rigid feeler arm or braking element 34 having a hat blade portion 35 adapted to engage material wound upon the bobbin, when it reaches a predetermined diameter. A spool of thread indicated by dot-dash lines is shown slipped over a pin 36. The bobbin winding operation is started by passing thread from the spool through a thread tensioning device 37 and coiling its end upon a conventional bobbin B; The lever arm of the device is then moved into its operating position and the thread is coiled upon the bobbin until it begins to bear against the blade 35 which is positioned between the flanges of the bobbin. Continued build-up of thread increases the frictional drag between the thread and the blade and also gradually forces the arm to move slightly counter-clockwise to reduce the driving friction between the wheel 25 and the handwheel of the machine. This process continues until the friction drive between the handwheel and the rubber-tired friction wheel 25 is offset by the friction drag between the coiled thread and the blade at which time rotation ceases.

One of the advantages of the device is its simplicity of operation. It will be seen that the device although extremely simple requires a minimum of attention by an operator, and that, the operators eyes need not be moved from the needle bar of the machine when it is time to move the arm into its inoperative position. The operator may of course at his discretion allow the device to stay'in its operating position until his sewing operation is completed, or he may simply raise his hand and strike the arm if he chooses to move it into its inoperative position. It will further been seen that the device can be moved into its operative position with equal ease and rapidity of movement.

From the foregoing description of the preferred embodiment it will be apparent that the advantages of the invention heretofore enumerated and others have been accomplished, and that there has been provided a new and improved bobbin winding device which automatically stops itself when its coiled material reaches a predeter' mined diameter and which can be moved into either its operative or non-operative positions by a mere flick of the hand.

- While the invention has been described with considerable detail it is not limited to the particular, constructions shown, and it is my intention to cover hereby all adaptations, modifications, and uses thereof which come within the-practiceiofthose skilled in the art to which it relates 32.Wiihi9t1lfi s en h appended a m Having' thus described my invention, I claim:

1. A bobbin winder for a sewing machine comprising sewing maehine-and provided at its other'end with a-rotatahlexsn n le a p e omou a bob n, a fric on whe attached tosaidspindleand adapted to be moved by said rm between an inactive position away from a drivember mounted on the head of the sewing machine and; n operating position wherein said wheel engages the drrvingmember, and spring means connected to the sewing machine headand to the lever arm and functioning on one side of a predetermined position of said lever arm to move the latter to andmaintain the latter in a position Whereinihe friction wheel engages the driving member and f nctioning onthe other side of said predetermined 'on to move the same to and maintain it in the inactive position of the friction wheel away from the drivin me'm er- A bobbin winder fora sewing machine comprising agieverpivotably mounted at one end to the head ofga sewing'machine and provided at its other end with a rotatable spindle and adapted to mount a bobbin, a friction wheel attached to said spindle and adapted to be moved by saidglever arm between an inactive position away from a rlriving member mounted on the head of the sewing machine and an operating position wherein said wheel engages the driving member, and a U-shaped spring con: nected to the sewing machine head at one end and to the lever arm at its other end and functioning on one side of ;a predetermined position of said lever arm to move the latter to and maintain the latter in'a position wherein the friction wheel engages the driving member and functioning on the otherside of said predetermined position to move the same to and maintain it in the inactive position 0f: tl1 e friction-wheel away from the driving member.

. 53 LA bobbin winder for a sewing machine comprising a lever pivotably mounted at one end to the head of a sewingmachine and provided at its other end with a rotatablels pindle and adapted to mount a bobbin, a friction engages the driving member, and a U-shaped compression springone end of which is attached to said armintermea on one side of a predetermined ppsitionof e nst h acti n, of .sai 'epr ng mean t 4* diate its pivoted connection and its spindle and the other end of which is attached to the sewing machine head intermediat the' operating'and inactive positions of "the lever arm and which spring acts on one side of a predetermined position of said lever arm to move the latter to and maintain the latter in a position wherein the friction wheel engages the giriyir g member and functioning on the other side of said predetermined position to move the arm to and maintain it inct he inactive position wherein the friction wheel is remotely located with respect to the driving member. 4. A bobbin winder for a sewing machine comprising a lever pivotably mounted at one end to the head of a amaqhi eandprevi sl skit ntberettibtith a rotatable spindle adapted to rnonnt a bobbin, a friction wheel attached to said spindle and-adaptedto' be moved by said lever arm between an inactive position away from a driving member mounted on the head of the sewing machine n pper ing po on whe ein sa d heelen t e vin em pringmeansmnn etcd o the-s ng ch he n o l ver-a m. andzf ns ioni s to move the latter ,to and maintain it in p V wherein the friction wheel engages athe driving member and functioning on the other side of said predetermined position to move the same to and maintain it inthe inaetive position of the friction wheel away. from therlriving mem er d 1 ak ng elem nta qh d to the he d .o the sewing machine and adapted to bear against material o n v p the-ba bin hen-i r aches .a p edet rmin d i m t n wh ch up mn in ed bt t qnbfi t b bbin forces the friction wheel away from its driving mem- 4. t l th fr tional driving engagement therebetween lsexceeded by ra n r ct on, b een the. b ak ng e ement and th material woundnpon the bobbin whereupon the rotation of the bobbin ceases.

' References Cited in the file of this patent UNITED STATES, PATENTS 575,587 Borton Jan. 19, 189.7 2,190,760 Anderson Feb. 20, 1940 FORE G rATE I 3,686 :Germany Apr. 12, 18.78

Images