US1382162A - Chester h - Google Patents

Description

C. H. BEACH.

SEWING MACHINE MOTOR.

APPLICATION FILED SEPT. 30. 1915.

1,382,162, PatentedJune 21, 1921.

UNITED STATES PATENT OFFICE.

CHESTER H. BEACH, OF RACINE, WISCONSIN, ASSIGNOR TO WISCONSIN ELECTRIC COMPANY, OF RACINE, WISCONSIN, A CORPORATION OF WISCONSIN.

SEWING-MACHINE MOTOR.

To all whom it may concern:

Be it known that I, CHESTER H. BEACH, a citizen of the United States, residing at Racine, Racine county. Wisconsin, have invented new and useful Improvements in Sewing-Machine Motors, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to improvements in small, portable, electric motors, adapted particularly for operating sewing machines.

One object of the invention is to provide a light, compact motor adapted to rest on the table-top of a sewing machine without permanent fastenings, and to drive the hand wheel of the machine by frictional engagement therewith.

Another object is to provide a portable motor of such size that it may be placed on the table-top of a sewing machine with its friction driving wheel beneath and in direct engagement with the handwheel of the machine.

A further object is to provide a motor which is movable with respect to its supporting base and arranged so that its driving wheel exerts an upward pressure against the hand wheel of the machine. thereby maintaining the necessary frictional contact.

A further object is to provide a motor which may be reversed end to end on its supporting base. whereby the direction of rotation of its armature shaft with respect to said base may be reversed. without changing the electrical connections,

further object is to provide an electric motor with an armature shaft adapted to have a driving pulley mounted on either end thereof. whereby when the motor is turned end to end on its base, the driving end of the shaft may always be at the same end of the base.

Other objects and advantages will hereinafter appear without specific enumeration.

In the accompanying drawings I have shown sei'eral embodiments of the invention. which will serve to illustrate its main features. The invention may be embodied in various other forms, however.

Figure 1 is a side elevation of one form of motor and associated parts.

Specification of Letters Patent. Patent d J n 21, 1921.

Application filed September 30, 1915.

Serial No. 53,232.

Fig. 2 is a side elevation of the same motor reversed with respect to its base, whereby it drives in a reverse direction.

Fig. 3 is a front elevation of the supporting base.

Fig. 4 is a side elevation of a modified form of the device.

Fig. 5 is a partial top plan view of the supporting base thereof.

Fig. 6 is a front elevation thereof.

Fig. 7 is a fragmentary section on the line 77 of Fig. 1.

The electric motor 1, illustrated in the various figures, is of small, compact construction and is light in weight, whereby it may be readily handled. It is completely inclosed at both ends, from which ends bosses project. The armature shaft is provided with reduced ends 3, which project beyond said bosses and each of which carries a small pin 4, which passes diametrically through it. projecting at both ends.

In Fig. 1. the left hand end of the armature shaft has mounted thereon a driving pulley 5, which may be made of rubber or other material adapted to maintain good frictional driving contact with the hand wheel 6 of a sewing machine or other driven wheel. The pulley is carried by a suitable hub 7, having a cylindrical extension 8 at one end which is slotted so that when said hub is slipped over the end of the armature shaft the slots receive the projecting ends of the pin 4. thereby locking the pulley against rotation about said shaft. Said pulley is held in place on the shaft by means of a scrcwtln'caded stem 9. having a knurled head 10. whereby it may be screwed into a threaded opening in the end of the armature shaft. Vl'ith the construction described the pulley may be quickly applied to or removed from the end of the armature shaft.

At the right hand end of said shaft, a cap 11 is provided. which has screw-threaded engagement with the inner wall of the bos both bosses previously mentioned, being intcriorly screw-threaded. as shown. The cap ll is out of contact with the end of the shaft and with the pin 4, whereby unnecessary friction is avoided when the shaft is rotating. The right hand end of the shaft is also provided with a screw-threaded opening, similar to that at the left hand end. From the construction thus far described, it will be seen that the pulley 5 may be applied equally well to the right hand end ofthe shaft, and the cap 11 may be fitted equally well over the left hand thereof. The position of the pulley and cap may therefore be reversed, for a purpose hereinafter described.

The lower part of the motor frame is provided with a flat surface 12, as shown in Fig. 7, and has a screw-threaded opening 13 therethrough, which receives a hollow bushing 1 1 having a knurled head. Said bushing serves to clamp the motor to a supporting plate .15, and surrounds the flexible cord conductor 16. The supporting plate 15 is provided with a projection 17, preferably struck up from the metal, which projection is adapted to fit within either of two recesses 18, 19, in said frame. lVith the mo-- tor as shown in Fig. 1, said projection is received within the right hand opening as seen in Fig. 7. By loosening the clamping bushing 14, however, the motor frame may be reversed with respect to its supporting plate 15, whereby the recess 19 is brought over the projection 17, instead of the recess 18. The projection 17 serves therefore not only to determine the proper position of the motor frame with respect to the supporting plate 15 in either of its two positions, but serves alsoin conjunction with the bushing 14c to positively lock the parts against accidental turning.

The plate 15 constitutes'part of the supporting base and is hinged about a pin 20 carried by an arm 21, made by doubling over a strip of metal, one end of which extends to the right, as shown in Figs. 1 and 2, to form a supporting leg 22, and the other end of which is brought forward as an arm 23, riveted at 24 to a transverse strip of metal 25, constituting two additional supporting legs. The motor is therefore supported in stable equilibrium on three legs, the ends of which are provided with rubher pads 26, or suitable equivalent means to prevent marring the polished table-top 27 of the sewing machine.

The hinge connection between the plate 15 and the rest of the supporting base permits the motor ordinarily to tilt downward until it rests on the high arched portion of the leg 22, as shown in dotted lines in Fig. 2. The pivot pin 20 is arranged considerably to one side of the center of gravity of the motor to insure this tilting action. In positioning the motor for use, the base is so located on the table-top as to permit the pulley 5 to bear upwardly against the lowermost portion of the hand wheel 6, the motor being tilted forward by hand to whatever extent is necessary to bring the driving pulley 5 beneath the hand wheel and into position. The motor thereafter tends to tilt back to its normal position, this return thereby insuring that the motor will remain where placed regardless of vibration and without any positive fastening means whatever, although auxiliary fastenings may be employed, if desired, if there is no occasion to remove the motor after it is once put into use.

The motor is preferably one which will operate either on direct or alternating current, and, therefore cannot be easily reversed. All sewing machines do not have the same direction of rotation of the hand wheel however, and hence it is desirable to have a 1nd tor which is adapted to drive either way to render it suitable for use with any machine. In order to obtain the advantages or a motor which will operate on either D. O. or A. C. circuits and which will also drive the hand wheel in either direction, I arrange my motor so that by virtue of the construction previously described, its position with repect to the supporting base may be reversed. To illustrate this feature, attention is directed to Fig. 2 in which the motor frame has been reversed end to end on the supporting base with respect to its position in Fig. 1. The armature rotates in tie same direction with respect to the frame, but said rotation is reversed with respect to the base. Since the pulley would be at the wrong end of the armature shaft in this new position, and hence out of engagement with the hand wheel 6, I provide the previously described arrangement whereby said pulley and the cap 11 may be made to change places. In Fig. 2 therefore, the pulley is on the opposite end of the armature shaft from what it is in Fig. 1, and likewise the cap. lVit-hout changing the electric connection in any way therefore, I am enabled to drive the hand wheel in either direction, as shown by the arrows in Figs. land 2. The reason the motor and base are not turned as a unit is that the pedestal which supports the hand- The lower end of the s ring is received within channels 30, forme on the sides of a base plate 31, said base plate bein secured to a lateral arm 32, over which slides a second arm 33. The motor is thereby provided with a supporting base, consisting of three legs, radiating from a common point, as in the first construction described, which legs rest on the table-top and serve to hold the motor in place. In order to further secure the base, however, said arms 32, 33, are drawn toward each other by a spring 34, connected to posts 35, 36 thereon, the outer ends, 37, 38 of said arms bein bent downwardly to roject into the ho es 39 in the table-top, tirough which the driving belt ordinarily passes. These arms therefore serve to positively position the motor base with respect to the table-top, although I do not limit myself to this construction, as the friction between the base and the table-top is considerable, due to the action of the spring. The holes 39 are in the same vertical plane as the alley 40, associated with the hand wheel. 11 some sewing machines, the pulley is on the opposite side of the hand wheel from what is shown in Fig. 4 and the belt holes are correspondingly displaced. To provide for this, the spring 28 may be adjusted with respect to the base 31, so that the driving pulley may be properly positioned regardless of the location of the belt holes 39. To clamp the base and the spring together, I provide a nut 41 and a stud 42,

' the latter being carried by the base plate 31 and projecting through a slot 43 in the spring 28.

The function of the spring is to hold the driving pulley against the hand wheel with a yielding pressure which not only insures the necessary frictional contact, but which also permits the pulley to be lowered beneath the hand wheel when the base is being positioned on the table-top. It further permits the pulley to be drawn away from the hand wheel by means of a cord 44, when it is desired to stop the machine without stopping the motor. This is the position of the motor as shown in full lines in Fig. 4. Said cord is secured to the free end of the spring 28 and passes through a pair of eyelets 45, 46. and thence down through the hole 39 to the foot treadle of the sewing machine, whereby the operator may control the machine by pressure on said treadle. When the pressure is relaxed, the motor assumes the dotted line position. The motor with the hinge connections shown in Figs. 1 and 2 may be controlled in like manner, if desired. by tilting it. although I prefer to control both forms of motor by a rheostat, operated by the pressure of the foot. A rheostat, especially adapted for this purpose is described in my Patent No. 1,201,921. Although the motors are shown as tilted back slightly in driving position, they may of course be horizontal or assume some other angle, within reasonable limits, depending on the height of the hand wheel above the table-top and on other factors.

With the construction shown in Fig. l, the motor may rest on a table having two different levels with the motor shaft substantially horizontal. In both forms of the device, the tilting of the motor with respect to its base permits the motor to engage and drive hand wheels arranged at different heights above the table top thereby ada ting the motor to sewing machines of di erent types.

It is apparent that some of the various features described are independent of the others. For example, the feature of yielding upward pressure against the hand Wheel need not necessarily be accompanied by the feature of reversing the motor and the pulley on the armature shaft, and conversely said reversible devices are applicable to motors other than those yieldingly mounted. Furthermore, I do not desire to limit myself to the particular type of spring mounting shown in Fig. 4, since various other arrangements may be devised for accomplishing the same results. aside from the substitution of the weight of the motor for a spring, as shown in Figs. 1 and 2. It is apparent therefore, that the invention may be embodied in various different forms. other than those illustrated herein, and I desire to cover such modified constructions wherever they fall within the scope of the appended claims.

I claim as my invention:

1. In a device of the class described, an electric motor having a friction driving wheel on its armature shaft, a driven wheel adjacent said friction wheel, a. supporting base. and a spring engaging said base and said motor to support the latter and hold said driving wheel in yielding engagement with said driven wheel.

2. The combination with a sewing machine motor. of a supporting base therefo and means detachably securing said motor to said base. in either of two positions of relative reversal.

3. sewing machine motor having an armature shaft and a pulley arranged to fit over and having a driving connection with either end of said armature shaft.

4. A sewing machine motor having an armature shaft protruding from both ends thereof. a driving pulley adapted to fit over either end of said armature shaft and a cap arranged to inclose either end of said shaft.

A sewing machine motor having an armature shaft provided with a pin at each end. a driving pulley having a slitted sleeve arranged to fit over either end of said shaft and cooperate with said pins, and a cap arranged to be secured directly to said motor and inclose either end of said armature shaft without contacting therewith.

6. In combination, a sewing machine motor having an armature shaft, a. supporting base therefor, means permitting reversal of said motor with respect to said base, and a driving pulley arranged to fit either end of said shaft.

7. In combination, a sewing machine motor having an armature shaft, a. supporting base therefor, means permitting reversalof said motor with respect to said base, and a driving pulley arranged to fit either end of said shaft, said motor being tiltable with respect to said base.

8. A sewing machine motor, consisting of a frame having hollow end bosses interiorly screw-threaded, an armature having reduced ends projecting from said bosses, and a cap arranged to have screw-threaded engagement with ither of said bosses to inclose either end of said. armature shaft without contacting with the latter.

9. In a device of the class described, an electric motor having a friction driving wheel on its armature shaft, a driven wheel adjacent said friction wheel, a supporting base and a flat spring cooperating with said base and with said motor to hold said driv ing wheel in yielding engagement with said driven wheel.

10. A, sewing machine motor comprising a motor and a U-shaped spring supporting said motor.

11. A device of the class described comprising an electric motor, a base member, and a U-shaped spring secured to said base member and supporting said motor.

12. A device of the class described comprising an electric motor, a base member, a U-shaped spring secured to said base member and supporting said motor, and belt hole projections on said base member.

The combination with a sewing ma-.

chine having a head and a table provided with belt holes therein, of an electric motor for driving said head and having a base resting on said table, means projecting into one of said belt holes to position said base, and means permitting relative adjustment of said motor with respect to said base in a direction substantially at right angles to the line connecting said belt holes to aline said motor with said head.

14. The combination, with a sewing machine having a hand wheel and a pulley atone sid thereof, of a table provided with belt holes therein in the plane of said pulley, an electric motor having a friction wheel to engage said hand wheel to drive the latter, a base resting on said table top, means associated with said base projecting int-o one of said belt holes to positionv said base, and means permitting relative adjustment of said motor with respect to said base to permit said friction wheel to engage said-1 hand wheel with said belt holes located on. either side of the plane of said hand wheel.

15. A sewing machine motor comprising a base having guides, a motor, a supporting element therefor having sliding engagement with said guides, and means for locking said supporting element to said base.

16. A sewing machine motor'comprisinga motor having belt hole projections, a channel member projecting at right angles thereto, a U-shaped spring, one end of which fits within said channel member and a motor secured to. the other end of said spring.

17. A sewing machine motor comprising a base, a U-shaped spring, one arm of which is secured to said base, an electric motor secured to the other arm of said. spring and. a cord alsosecured to said other arm whereby the ends of said spring may be drawn toward each other.

18.. A sewing machine motor comprising a supporting 'base, an electric motor resting thereon, said motor having an opening in the casing which registers with an opening in said base, a projection on one of said members cooperating with one of a plurality of recesses in the other of said members and an insulating bushing passing through said registering openings and securing said motor to said base in any one of a plurality of positions.

19.v The combination with a sewing machine having a base portion, a frame portion and a wheel to be driven, of an arm secured to the machine,- a motor having a driving wheel to frictionally engage said driven wheel, a second arm carrying said motor and movable with reference to said'first' arm, and means for yieldingly' holding said motor wheel against said driven wheel.

20. The combination with a sewing machine having a base portion, a frame portion and a wheel to be driven, of an arm secured to the machine, a motor having a driving wheel to frictionally engage said driven wheel, a second arm carrying said motor and movable with reference to said first arm, means for yieldingly holding said motor wheel against said driven wheel, and means for moving said motor closer to said base portion and causing the disengagement of said wheels.

In witness whereof, I have hereunto subscribed my name, this 27day of September,

CHESTER H. BEACH. Vitnesses L. B. AUGUSTINE, JACOB K. OLSON.

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