US791528A - Sewing-machine motor. - Google Patents

Description

PATENTED JUNE 6, 1905.

H. J. YOUNG.

SEWING MACHINE MOTOR.

APPLICATION FILED FEB.20,1904.

2 SHEETS-SHEET 1.

N V WV/PW @N M.

No. 791.528. PATENTED JUNE 6, 1905.

H. J. YOUNG.

SEWING MACHINE MOTOR.

APPLICATION FILED PEB.20,1904'.

2 SHEETSSHBET 2.

UNTTED STATES Patented June 6, 1905..

HOMER J. YOUNG, OF TOLEDO, OHIO.

SEWING-MACHINE MOTOR.

SPECIFICATION forming part of Letters Patent No. 791,528, dated June 6, 1905.

Application filed February 20, 1904. Serial No. 194,567.

To all whom, it nan/y concern:

Be it known that I, HOMER J. YOUNG, a resident of Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Sewing-Machine Motors, of which the following isa specification. This invention relates to improvements in sewing-machine motors, and has reference more particularly to an electric motor designed for application to many of the sewingmachines now in common use without reconstructing or substantially changing the machines, being therefore in the nature of an attachment.

Among the salient objects of the present invention are to so construct and arrange the motor that in general form it resembles the ordinary hand-wheel of the sewing-machine head and is used in lieu of the latter by the operator, the motor being to this end so designed that the external member is the rotating member; to provide at the same time a construction which is extremely compact and fully housed against the possibility of injuring the operator by careless handling of the same; to provide a construction which may be almost instantly and with the greatest convenience entirely detached from the sewingmachine head; to provide means for holding the non-rotative member of the motor fixed against rotation by the use of a simple springclamp, which adapts itself to the arm of the machine and may be applied and withdrawn from the latter without involving the use of mechanical fastenings; to provide a construction which permits of the use of roller-bearings between the fixed and rotative members without sacrificing accuracy of adjustment and movement of the parts relatively to each other; to provide a construction in which the rotating member becomes a support for the field or stationary member, thereby dispensing with any support external to the motor other than some means for merely holding the stationary member from rotating, and in general to provide improved details of construction and arrangement in a motor of the character referred to.

the matters hereinafter described, and more particularly pointed out in the appended claims.

The invention will be readily understood from the following description, reference being had to the accompanying drawings, forming a part thereof, and in which Figure 1 is a side elevation of the complete motor applied to the main shaft of a sewingmachine head. Fig. 2 is an axial sectional view taken on the two different radii indicated by the indirect dotted line 2 2 on Fig. 4. Fig. 3 is an end elevation of parts shown in Fig. 1. Fig. L is an inside or face elevation of the motor removed from the main shaft, the easing or outer shell of the motor being omitted. Fig. 5 is a.view of the field member removed from the armature-ring and viewed from the opposite side to that shown in Fig. 4.. Fig. 6 is a transverse sectional view taken on line 6 6 of Fig. 5. Figs. '7, 8, and 9 are details of the extension-sleeve and cooperating frictionclutch.

Referring to the drawings, 1 designates as a whole the main shaft of a sewing-machine head, upon which is mounted and keyed against rotation an extension-sleeve 2, the latter being in the present instance held against rotation by means of a set-screw 3. The extension-sleeve-is provided at its inner end with an annular enlargement 4, the outer face of which forms a shoulder 5. Upon the extension-sleeve and fitting against said shoulder is mounted the main frame member 6 of the motor, which is so constructed as to support practically the entire motor mechanism and at the same time substantially inclose the latter. To this end said frame member com prises a central sleeve member 7 which fits accurately upon the extension-sleeve and is approximately coincident in length with the latter, a skeleton outer face 8, and an integral peripheral rim 9.

In order to lock the main frame member rigidly upon the extension-sleeve or release it, so that it may rotate freely thereon, a friction-clutch mechanism is provided, comprising, as best shown in detail Figs. 7, 8,

To the above ends the invention consists in l and 9, a hand-nut or screw 9, threaded to fit the interior of the end of the extension-sleeve l latter, and the inner margins of said pole- 2, and an interposed stop-washer 10, provided with lugs 11, which engage correspondinglyformed recesses 12, formed in the end of the extension-sleeve. The hand-nut 9 has a relatively large and flat, head, through the peripheral portion of which is inserted a stopscrew 13, which is adapted to cooperate with a stop-lug 14, formed upon the periphery of the washer 10. The relative construction and arrangement of the parts is such that when the hand-nut is screwed home the sleeve 7 of the main frame member is clamped between the shoulder 5 and the inner face of the hand-nut, the stop-washer 10 being interposed between these parts. After the hand-nut has been adjusted so as to hold the parts rigidly together the stop-screw 13 is inserted and thereafter prevents the hand-nut from being rotated more than a part of a revolution, a partial rotation of the hand-nut being sufficient in all instances to loosen the clutch and permit the motor to rotate upon the extension-sleeve.

Next describing the construction of the motor proper, 15 designates as a whole the commutator-ring, comprising the usual insulated segments separated from each other and seated in a ring of insulating material 16, said commutator-ring being fitted accurately upon the exterior of the sleeve member 7 of the main frame and held in position and against rotation by means of a clamping-ring 17, threaded upon the end of said sleeve. The outer face of the ring 17 is grooved to form a ball-race 18, within which is arranged a set of balls 19, and upon these is mounted the field member of the motor, (designated as a whole 20.) Said field member comprises an inner annulus of two-part construction comprising a main member 21, provided with an inner extension 22,

forming one member of a ball-race and internally threaded, as indicated at 23, to receive the other member, 24. The member 24 constitutes the cone or adjustable ball -confining ring.

The member 21 is provided with pole extensionstwo in the present instancearranged at diametrically opposite points and designated 25. (See Eigs. 4 and 5.) Upon the ends of these extensions are mounted the polepieces proper, 26, which, as clearly shown in Figs. 4 and 5, are peripherally extended, so as to provide fields of considerable angular width. The field-windings 27 surround the pole extensions 25, as shown clearly in the drawings.

34 designates the several coils of the armature, which are separated by washer-like polepieces 35. The pole-pieces 35 are constructed to fit accurately and closely upon the body of the ring 28, so that they form when in position practically integral extensions of the pieces are formed as nearly flush or coincident with the inner surfaces of the coils 34 as practicable in order that the field pole-pieces 26 may approach as closely to the iron of the armature as practicable. The armature-ring as a whole is secured to the main frame by means of screws or screw boltsinserted through the outer face of said frame and through the contained armature-ring, as indicated clearly in Fig. 2, the same securingscrews being employed to hold in position a casing-plate 9,, which forms a detachable inward extension of the rim 9.

Describing next the construction and arrangement of the commutator-brush es, and referring to Fig. 2, 36 designates a pair of tubular casings of insulating material seated in radially-extending and oppositely disposed apertures 37, formed in the member 21 of the field. Within said casings are mounted to slide carbon brushes 38, which engage at their inner ends the commutator and at their opposite ends are provided with stems 39, which extend out through keyhole-shaped apertures in the otherwise closed ends of the casings. Between the ends of the brushes and the outer ends of the casings are interposed expansion-springs41, which normally hold the brushes in yielding contact with the commutator. In order that the brushes may be retracted and locked in retracted position, each stem 39 is provided with a cross-pin 42, adapted to work through the keyholes 40 and to hold the brushes retracted when drawn outside of the casing and turned transversely of said keyholes. Lead-conductors 43 are shown connected to the stems of the brushes 39, although it will be obvious that said leads might be connected to the coils of the springs 41, if preferred.

The field member of the motor is held against rotation by means of the spring-clamp 44, consisting of a pair of spring-arms formed integrally with each other and connected with the annulus of the field member, as indicated at 45, said arms being shown as extending radially and slightly divergently outward beyond the periphery of the motor and terminating in right-angled extensions 46, adapted to embrace the opposite sides of the standard of the machine-head, as shown clearly in Fig. 1. In order to avoid disfiguring the standard, the extensions 46 are desirably provided with rubber protectors 47.

The assembling and operation of the device have been fully indicated in connection with the description of the construction and need not, therefore, be repeated. It may be noted, however, that the construction and arrangement of the device is such that the operator may use the motor as a hand-wheel for stopping and starting the machine in precisely the v same manner as though it were, in fact, a handwheel, and this is a feature of much importance, inasmuch as it entirely dispenses with the necessity of any braking mechanism. It will be noted also that with the construction described I fully attain all of the objects hereinbefore specified and provide at the same time an extremely compact, cheaply constructed, and efficient motor.

I claim as my invention 1. In combination with a drive-shaft, an electric motor comprising a rotor mounted concentrically upon the shaft and having driving connection with the latter, a stator mounted concentrically within the rotor and supported by the latter, and means for holding the stator against rotation.

2. In combination with a drive-shaft, an electric motor comprising a rotor mounted concentrically upon the shaft and having driving connection with the latter, a journal rigid with the rotor and arranged concentrically within the latter, a stator mounted upon said journal concentrically within said rotor, and means for holding the stator against rotation.

3. In combination with a drive-shaft, an electric motor comprising a rotor mounted concentrically upon the shaft, a clutch mechanism for operatively engagingand disengaging said rotor with and from said drive-shaft, a journal rigid with the rotor and arranged concentrically within the latter, a stator mounted upon said journal concentrically within said rotor, and means for holding the stator against rotation.

4c. In combination with a sewing-machine head and the actuating-shaft thereof, an electric motor comprising a main frame member having a central journal-sleeve mounted upon said drive-shaft, a radially-extending portion and an armature mounted upon the peripl eral portion of said main frame, a field member mounted concentrically within said armature and journaled upon the journal-sleeve of the main frame, and means for holding said field member against rotation.

5. In combination with the driveshaft of a sewing-machine head, an extension-sleeve rigidly mounted upon the end of said shaft, a main frame provided with a central sleeve rotatably mounted upon said extension-sleeve, a friction-clutch for operatively connecting said extension-sleeve and main frame, an armature mounted upon the periphery of said main frame, a field member journaled upon the exterior of the central sleeve of the main frame and concentrically within said armature, and a holding-arm connected with the field member and detaehably connected with a stationary part of the machine-head.

6. In asewing-machine motor, the combination of an extension-sleeve provided at one end w ith an external shoulder and internally threaded at its opposite end, a hand-nut having screw-threaded engagement with the interior of said extension-sleeve, a motor-frame member provided with a central sleeve mounted upon the exterior of said extension-sleeve and adapted to be frictionally locked to the latter by means of said hand-nut, a set of commutator-segments mounted upon the exterior of the sleeve member of the motor-frame, a clamping-ring threaded upon the exterior of said sleeve adjacent to the commutator-segments. a ball-race formed in the exterior of said clamping-ring, a field member provided with an inwardly-facing ball-race arranged concentrically with and around said clampingring, a set of balls interposed between the field member and clamping-ring, and an armature rigidly mounted upon the periphery of said motor-frame member, substantially as described.

7. In a sewing-machine motor, the combination of a main motor-frame member provided with a concentrically-disposed sleeve, a radially-extending casing member and a smooth peripheral rim, an armaturering rigidly mounted concentrically within said rim, afield member journaled upon the exterior of the sleeve of the main frame member concentrically within the armature-ring, a set of commutator-segments mounted upon the exterior of said frame-member sleeve, commutatorbrushes mounted upon the field member extending radially inward and engaging said commutator-segments, means for operatively connecting said main frame member with the drive-shaft, and means for holding the field member against rotation.

8. In an electric motor, a friction-clutch mechanism comprising a relatively fixed sleeve, a motor member journaled upon said sleeve, a clamping-nut having screw-threaded engagement with one end of the sleeve and adapted to clamp the motor member to the sleeve, a stop-washerinterposed between said clamping-nut and the clamping motor member, means connecting said washer in non-rotative engagement with said sleeve, a stop projection upon said washer and a cooperating stop projection upon the clamping-nut, substantially as described.

9. In combination with the drive-shaft of a sewingmachine head, an extension sleeve mounted upon said shaft, a motor member mounted upon the exterior of said sleeve, a clamping-nut threaded into the end of the said sleeve and adapted to clamp said motor member rigidly with the sleeve, a stop-washer interposed between the clamping-nut and motor member, provided with one or morelugs engaging corresponding recesses in the end of the extension-sleeve, a stop projection upon the periphery of said washer, and a stop-pin threaded through the clamping-nut and projecting IIO into the path of the stop projection of the Washer, substantially as described.

10. In combination with a sewing-machine head and the drive-shaft thereof, an electric motor mounted upon said drive-shaft and having an inner stator member and an outer rotor member and a yoke for holding said stator against rotation comprising a pair of springarms connected With the stator member extending radially therefrom and embracing op- I0 posite sides of the adjacent standard of the machine-head.

HOMER J. YOUNG.

Witnesses:

ALBERT H. GRAVES, FREDERICK C. GooDwIN.

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