US2018624A - Motor-support and bobbin-winder of sewing machines - Google Patents

Description

G. M. EAMES I 2,018,624

MOTOR SUPPORT AND BOBBIN WINDER OF SEWING MACHINES Oct. 22, 1935,

2 Sheets-Sheet 1 Filed April 7, 1932 IIIIIIIIIIIIIII I lllllll Oct, 22, 1935. 2,018,624

-MOTOR SUPPORT AND BOBBIN WI'NDER 0F SEWING MACHINES M. EAMES 2 Sheets-Sheet 2 Filed April 7, 1932 Jmmtw Geo ye M flames Patented Oct. 22, 1935 UNITED STATES MOTOR-SUPPORT AND BOBBlN-WINDER OF SEWING MACHINES George M. Eames, Bridgeport, Conn., assignor to The Singer Manufacturing Company, Elizabeth,- N. J a corporation of New Jersey 8 Claims.

This invention relates to sewing machines and more particularly to electric drives, andbobbinwinders therefor.

During the operation of lock-stitch sewing machines it is frequently necessary to rewind the bobbin which supplies the lower thread to the stitch-forming mechanism. In certain types of sewing machines as heretofore constructed the driving means has been connected to the balance- 10 wheel of the sewing machine which is connected to the stitch-forming mechanism by suitable means including a clutch so that the balancewheel could be disengaged from the stitch-forming mechanism when it is desired to wind the bobbin. This arrangement for disconnecting the driving means from the stitch-forming mechanism was provided to prevent the stitch-forming mechanism from disturbing a partially completed seam; to make it unnecessary to unthread the machine; and to prevent unnecessary .wear and undue vibration during the bobbinwinding operation. These machines were provided with a bobbin-winding supporting spindle mounted independently 'of the sewing machine mechanism and adapted to be connected to the driving mechanism after the latter has been disconnected from the stitch-forming mechanism.

In the small portable types of sewing machines having their main or driving shaft located below the bed-plate no provision is made for disconnecting the stitch-forming mechanism from its actuating means; The bobbin, in such instances, is usually wound upon .a bobbin-supporting extension on the upper or needle-bar 36 actuating shaft. The disadvantages of this construction are: unnecessary wear and undue vibration; and the necessity of 'unthreading the machine during the bobbin-winding operation.

The objects of this invention are: to greatly 40 simplify the mechanism required to disconnect the actuating means from the stitch-forming mechanism; to provide simple and eifective means for winding the bobbin; to construct a bobbin-winder which is light in construction and can be manufactured and assembled at little expense; to provide improved means whereby the friction between the driving and driven means remains constant; and to provide means whereby the element transmitting power from the driving to the driven means can be replaced readily. With the above and other objects in view, as

will hereinafter appear, the invention consists in the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred em- Application April 7, 1932, Serial No. 603,775

bodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the drawings: I

Figure 1 is a top plan view of the base of a family type portable sewing machine embodying m'y improved motor-support and bobbin-winder, partly broken away to show the relation of the parts.

Figure 2 is a rear elevation, partly in section, of the machine.

Figure 3 is an end elevation. Figure 4 is a perspective view of the lever for shifting the driving means into and out of drivll ing relation with the main shaft.

In the embodiment'of this invention selected. for illustration, I is the base plate to which is secured by the screws 3 the hollow bed 2 of the sewing machine. The machineis provided with 20 the usual balance-wheel 4 having a belt-groove 5. The balance-wheel 4 is fixed upon the main shaft 6 located in the bed-plate 2 of the sewing machine, which shaft actuates the stitch-forming mechanism in the usual and well known 2| manner.

Pivotally secured upon the base I by the pivot screw I is a fiat arm 8 having an upturned portion 9. Secured by screws ID to the free end of the fiat arm 8 is a dynamo-electric device or so t the base i by screws 20. A compression spring 2i reacting against the closed end I8 of the hollowv case ll urges the plunger 22 into contact with the upstanding portion 9 of the flat arm 8. The 65 compression spring 2! is strong enough to swing the motor ii in a counterclockwise direction or rearwardlyaway from the balance-wheel 4. From the foregoing it will be obvious that the motor is mounted in such a manner that it tends 60 constantly to swing or move about its pivot I in a direction to tighten the' belt I6, thus at all times maintaining the belt 'lfiunder tension.

Pivotally secured upon the end wall ofthe hollow bed 2 by the shouldered screw 23 is a lell ver 24 having a stop 25, a projection 26, and an outwardly extending lip 21 made integral therewith. A smooth wear plate 28 is tacked to the base I, the object of which is to provide a smooth surface over which the motor Il may slide when it is shifted towards and away from the balancewheel 4.

To disconnect the motor II from the balancewheel 4, the lever 24 is shifted from the dotted line position to the full line position as shown in Figure 3. Shifting of the lever 24 causes the projection 26 of the lever to contact the motor bearing-bushing 29 and force the motor II towards the balance-wheel 4. When the lever 24 reaches the full line position as shown in Figure 3, the bearing-bushing 29 enters the depression 26' where it is locked, due to the contour of the lever 24, until it is released by shifting the lever 24 to the dotted line position shown in Figure 3. During the shifting of the lever 24 from the dotted to the full line position the outwardly extending lip 21 engages the lower or slack run of the driving belt 5 and forces it upward thereby relieving the belt l6 of any tendency to frictionally adhere or engage the driving pulley I 4 and establish driving relation with the balancewheel 4. After the motor has been shifted out of driving relation with the balance-wheel, the bobbin may be wound by placing it on the bob-' bin-winding spindle l5 and operating the motor control in the usual and well known manner.

It will be observed that the pivot point I is located at the extreme end of the fiat arm 8 thus increasing the radius of the arc through which the driving pulley I4 moves. Due to the fact that the are through which the driving pulley l4 moves is small and due to the location of the pivot point 1 the belt-groove IS in the driving pulley l4 and the belt-groove 5 in the balancewheel 4 are always substantially in alignment. The advantages of mounting the motor in this manner are: the driving belt does not have to be made with the same exactness as when the motor is rigidly mounted; the slack in the belt is taken up automatically as the belt stretches; the tension on the belt is constant when the motor is driving the machine, thus reducing wear on the belt; and the belt can be readily replaced when it becomes worn.

From the foregoing description considered in connection with the acompanying drawings, the construction, manner of operation and several advantages of my improved motor-support and bobbin-winder will be clearly and fully understood It is apparent that such a device has a wide variety of uses, and it willbe understood that the form, construction and arrangement of the several elements employed may be varied. Therefore, the privilege is reserved of resorting to all such legitimate changes therein as may be fairly embodied within the spirit and scope of I thra'mcemcdcclaims.

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t he l2! imai-stahtio 5: t 21d let .nratdho iii If'J t1 iiel up m mosa ll. 1 i: 1! vii imiidin g. in :lbi'nnit Willi 2. In combination with a sewing machine having a main shaft, a motor having a rotor shaft with a. bobbin-supporting spindle thereon, means connecting said rotor shaft with said main shaft, spring means urging said motor into driving re- 5 lation with said connecting means, and a member for shifting and locking said motor out of driving relation with said connecting means, whereby said motor may be used independently of the machine for winding 9. bobbin.

3. In combination with a sewing machine having a main shaft with a balance-wheel fixed thereon, a motor fixed to one end of an arm fulcrumed on a vertical pivot fixed to the bed of the sewing machine frame, said motor having a 15 rotor shaft with a driving pulley and a bobbinwinding spindle fixed thereon, and a single means for shifting and locking said motor into and out of driving relation with said balance-wheel.

4. In combination with a. sewing machine hav- 20 ing a. main shaft with a balance-wheel fixed thereon, a motor pivoted to the base of the sewing machine, said motor having a rotor shaft with a driving pulley and a bobbin-winding spindle fixed thereon, a belt connecting said balance- 25 wheel and driving pulley in driving relation, spring means constantly urging said motor away from said balancewheel to maintain said belt taut, and means for shifting said motor towards said balance-wheel against the action of said spring means.

5. In combination with a sewing machine having a frame and a main-shaft with a balancewheel fixed thereon, a motor movably mounted on the frame of the sewing machine, said motor hav ing a rotor shaft with a driving pulley and a bobbin-winding spindle thereon, a belt connecting said balance-wheel and driving pulley in driving relation, spring means for constantly urging said motor away from said balance-wheel to maintain 40 said belt taut, and'a lever for shifting said motor towards said balance-wheel against the action of said spring.

6. In combination with a sewing machine having a hollow bed, a main-shaft Journaled in said 45 bed, a balance-wheel carried by said shaft, a motor located in said bed and movably sustained thereby, said motor being provided with a driving pulley and a bobbin-winding spindle, a belt connecting said driving pulley with said balance- 50 wheel, a spring constantly urging said motor away from said balance-wheel to maintain said belt taut, means for shifting said motor towards said balance-wheel against the action of said spring to render said motor ineffective to drive said balance-whe'el and main-shaft, and means for looking said motor in its ineffective position.

7. In combination with a sewing machine having a main-shaft with a balance-wheel fixed thereon, a motor movably secured to the frame of 60 the sewing machine, said motor having a rotor shaft with a driving pulley fixed thereon, a belt ornrume'ntin g: iidi b. atla'ncec-o-lriviedefa ail-dunno p with:

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the sewing machine, a driving pulley carried by said motor, a belt connecting said balance-wheel and driving pulley in driving relation, spring means constantly urging said motor away from said balance-wheel to maintain said belt taut, and a lever pivoted to the frame of the machine for shifting said motor towards said balancewheel against the action of said spring, said lever being formed with a lip which is adapted to engage and raise the slack run of said belt to further relieve the belt of a tendency to frictionally engage the driving pulley.

GEORGE M. EAMES.

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