US767128A - Sewing-machine motor. - Google Patents

Description

No. 767,128. PATENTED AUG. 9, 1904.

' "HUI. YOUNG. SEWING MACHINE MOTOR.

I nrmouxox FILED emu-.6. 1903. 1 no MODEL.

UNITED STATES Patented August 9, 1904.

HOMER J. YOUNG, OF TOLEDO, OHIO.

SEWING-MACHINE MOTOR.

SPECIFICATION forming part of Letters Patent No. 767,128, dated. August 9, 1904.

Application filed September 8. 1903. Serial No. 172,293. (No model.)

To all whom it may concern.-

Be itknown 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 is a specification.

This invention relates to improvements in sewing-machine motors, and has reference more particularly to a motor designed for application to many of the sewing-machines now in common use without reconstructing or substantially changing the machines, being therefore in the nature of an attachment, but embodying novel features of construction and arran'gement in itself.

Among the salient objects of the invention are to provide an extremely compact structure so designed that it may be readily applied to a sewing-machine as ordinarily constructed; to provide in conjunction with the motor mechanism proper means for conveniently and reliably attaching or supporting the same from the sewing machine table, thereby avoiding the necessity of constructing specially-shaped attachments for various sewingmachine heads; to provide in a motor of the character referred to simplified and improved details of construction, rendering the motor more compact, capable of being more cheaply manufactured and assembled, and at the same time possessing a higher efiiciency; to provide in a construction of the character referred to means for attaching the same to the table of the sewing-machine, which attaching means are capable of adjustment to compensate for slight variations in distance between the table-top and needle-arm shaft of the machine; to provide an improved construction and arrangement of the commutator mechanism, rendering thesame at once simple, compact, and capable of being conveniently housed; to provide in conjunction with a motor of the character referred to an improved form of brake, and in general to provide a simple and improved construction of the character referred to.

To the above ends the invention consists in the matters hereinafter described, and more particularly pointed out in the appended claims.

In the drawings, Figure 1 is a View showing a fragmentary portion of the head of an ordinary sewing-machine and my improved motor applied thereto, the latter being shown principally in vertical axial section. Fig. 2 is a right-hand end elevation of the parts shown in Fig. 1, the casing of the motor being, however, removed, except as to fragmentary portions thereof through which the commutator-brushes extend. Fig. 3 is a plan View of the supporting-bracket, the relative positions of parts of the sewing-machine head being shown in dotted lines. Fig. 4: is a side elevation of the hand-brake detached. Fig. 5 is a top plan View of the brake member shown in Fig. 4 with connected parts in section. Figs. 6 and 7 are details of the two forms of armature-disks.

Referring to the drawings, 1 designates as a whole the upright portion of a sewing-machine arm or head casting, 2 the bed-plate thereof, and 3 a portion of the sewing-machine table upon which the head rests.

4c designates as a whole a supporting or attaching bracket, which by means of bolts 5, extending through the base portion 7 thereof, is rigidly secured to the sewing-machine table.

6 v designates clamping screws threaded through the base-flange of the bracket and arranged to impinge at their lower ends upon the upper surface of the bed-plate of the sewing-machine head, the bracket being shown as recessed at its under side, as indicated at 7 to receive the edge of the bed-plate beneath said clampingscrews. Said bracket is provided with an integral standard 8, which is transversely apertured near its upper end, as indicated at 9, to receive a clamping-bolt 1O.

11 designates as a whole a field member of the motor, the iron member of which is in the form of a yoke, having the arms 12, curved to correspond to the periphery of the armature, and the shank portions 13, upon which are mounted field windings or spools 14:. The yoke is provided at its lower end with an integral downwardlyextending lug l5, vertically slotted, as indicated in dotted lines at 16, to receive the clamping-bolt 10 and to afford a limited vertical adjustment of the yoke relatively to the armature. In this connection it is to be noted that the aperture 9 through the the latter.

bracket 4 is of slot form and extends hori- Zontally or transversely also, as shown in dotted lines inv Fig. 2, thus providing for lateral adjustment of the yoke member. These two adjustments of the yoke make it possible to keep the armature which is within the yoke in a perfectly concentric position relative to the shaft of the machine. The yoke-arms 12 are of substantially uniform size in cross-section throughout their length, being shown as rectangular or oblong rectangular in crosssection in the present instance, and in order to facilitate construction the straight shank portions 13 are constructed to merge into the curved arms 12 in the form of smoothly curved portions 17, the object of this construc tion being to enable the field-windings to be first formed and then slipped down over the arms into place. It is to be understood that the spools or field-windings 14 will be of what is known as the flexible type, so as to bend sufiiciently to pass over the curved portions 12 and 17. V I 18 designates the end of the main shaft of the sewing-machine head, which projects from the sewing-machine arm and upon which is mounted the armature of the motor.

Describing the armature, 19 designates a sleeve fitted upon the end of the shaft 18 and, by means of a set-screw 2O rigidly secured to Upon the sleeve 19 is seated a brake-disk 21, provided with an integral sleeve extension 22, telescoping upon the ex: terior of the sleeve 19 and extending atone end slightly beyond the end of the sleeve 19. The sleeve 19 is provided at its inner end with an annular conical shoulder 23, against which a correspondingly-shaped shoulder 24 ,upon the brake-disk abuts, and the sleeve extension of the brake-disk isprovided at its outer end with a reversely-inclined conical shoulder 25, which is engaged by a correspondinglyshaped shoulder 27, formed upon a clampingscrew 26. r The clamping-screw 26 is externally threaded and arranged to fit within the correspondingly-threaded end of the sleeve 19. It will be understood that the sleeve 19, with its inclined shoulder 23, and the extensionits inclined shoulders 24 and 25 cooperating with the clamping-screw 26, constitute a'wedging friction-clutch mechanism by means'of which the brake-disk is frictionally and effectively held against rotation upon the sleeve 19 or maybe permitted to rotate thereon at will. By the use of the inclined or wedge-shaped shoulders a more perfect, and therefore a more effective, frictional engagement between the sleeve of the armature and the sleeve upon the machine-shaft is secured, and there is not the possibility of a working loose of the handscrew as there is between a straight end-toend engagement with a much less frictional surface. Describing the armature, 28 desig natesa series of armature-disks arranged in register with each other, part of said disks being in the form of open rings, as seen in detail, Fig. 7, and the remainder having spidershaped centers 29, as indicated in detail, Fig. 6. Thosemembers of the disks having the spider-shaped centers constitute the supporting members for the remainder of the armature, being to this end arranged in superposed order and fitted upon the exterior of the sleeve extension 22 of the brake-disk and abutting at one side against an annular shoulder 30 upon the said brake-disk. The remaining disks are secured at either side of the supporting-disks and in register with the latter by means'of through-pins 31. In order that the armature may be. connected to rotate positively with the brake-disk, the supporting-disks 28 are provided with keyways 32, which engage corresponding keys seated within the exterior of the extension-sleeve 22. The windings 33 are of well-understood form and arranged to embrace the entire series of disks, as shown clearly in Fig. 1.,

The armature as a Whole is secured against endwise movement upon the sleeve 22- by means of a space-ring 34, which space-ring also serves the function of holding in position one set of the commutator-segments 35 and for this purpose has its outer end of undercut form, as indicated at 36. The commutatorsegments and intervening insulated blocks are arranged in the usual manner and forms as a wholean annulus the inner base portion of which is of dovetail construction, as shown clearly in Fig. 1. The outer side of this annulus is engaged by means of a clamping-ring 37, which is threaded upon the exterior of the sleeve extension 22 of the brake-disk, as indicated clearly at 38. It will be understood from the foregoing description that this clamping-ring 37 thus acts not only to confine the commutator-annulus, but also through the medium of the space-ring 34 to hold the supporting armature-disks in clamping engagement with the annular shoulder 30 hereinbefore referred to.

139 designates the commutator-brushes, arranged in radial relation to the .commutator and seated to reciprocate in sockets 40, formed upon the outer casing 41 of the armature. The commutator-brushes are, as usual, insulated, from the sockets by means of tubularcov erings 42 and are held in yielding engagement with the commutators by means of coiled springs 43 interposed between the outer ends of the brushes and caps 44, threaded upon the outer ends of the sockets. The brushes are connected in a usual manner with the fieldwindings, one such connection being indicated at 45, and likewise the armature-windings are connected with the commutators, as usual, one connection being indicated at 46.

47 and 48 designate the main conductors,

which will in use be connected with any suitand 48 being connected in the present instance to the field-windings 14, as best shown in Fig. 2.

The casing 41 hereinbefore referred to is conveniently formed of sheet metal and arranged to substantially inclose the outer or exposed side of the armature and field members. Conveniently the casing is secured in place by means of one or more screws inserted therethrough and into the yoke member, as indicated at 49.

5O designates as a whole a brake-shoe member which is pivotally'supported at one end upon one of the yoke-arms, as indicated at 51, and arranged to overlie the upper periphery of the brake-disk, being to this end curved to conform to the periphery of the brake-disk and provided with a V-shaped inner edge 52, which engages a correspondingly shaped groove in the periphery of the disk. At its free end the brake member 50 is bent radially outward and provided with a handpiece 53, by means of which it may be manually depressed into bearing with the brake-disk. In order to hold the brake normally free from the brakedisk, a novel construction is provided comprising a stud 54, rigidly connected with the yokearm and having a pivot extension 55, which is approximately half-round, as best seen in Fig. 4. Upon the upper side of the brake member is mounted a plate-spring 56, which at its free end overlies and bears upon the flattened side of the pivot extension 55, the relation of this flattened surface being such that the spring normally holds the brake-shoe slightly uplifted.

As afurther feature which may be employed or dispensed with at will I provide a footbrake member 57, pivoted at one end, as indicated at 58, to the power portion of one of the yoke-arms and arranged to underlie the lower periphery of the brake-disk and engage the latter in a manner substantially similar to the previously described brake member. The brake member 57 extends outwardly at its free end and is connected with a thrust-rod 59, which extends downwardly through a suitable aperture 60 in the bracket 4 and through a subjacent table and is connected at its lower end with any suitable mechanism, by means of which it may be forced upwardly and apply the brake. The weight of the brake mechanism will in this instance normally hold the brake out of bearing with the brake-disk.

As a further feature of improvement I provide means for utilizing the counter electromotive force generated by the running of the armature after the latter has been short-circuited and while current is still passing through the fields. To this end I provide upon field-piece 12, adjacent to the free end of the brake member 50, an insulated contactstud 60, upon which is mounted a spring-strip 61, extending beneath and adapted to cooperate with a second insulated contact-stud 62,

mounted upon the brake member 50. The studs 60 and 62 are connected with the respective windings of the field by means of conductors 63 and 64, so that when the contacts 61 and 62 are in bearing with each other the current will be from one field-winding direct through said contacts to the other and out, thus short-circuiting the armature. The contacts 61 and 62 are so disposed relatively to each other that the electrical circuit will be closed therethrough before the brake is applied mechanically to the brake-disk. Accordingly the operator may use only the counter electromotive force for breaking the armature or may use both this force and the mechanical friction in conjunction by forcing the brake member into bearing with the brake-disk.

While I have herein shown and described what I deem to be the preferred embodiment of my invention, yet it will be understood that the details of construction may be modified Without departing from the spirit of the invention, and I do not, therefore, limit myself to these details except to the extent that they are made the subject of specific claims.

I claim as my invention 1. In combination with a sewing-machine, an electric motor and means for attaching the same to the sewing-machine comprising a bracket adapted to be rigidly secured to the table of the machine and provided with a standard, an armature mounted concentrically upon the sewing machine shaft and a field member rigidly and adjustably connected with the standard of said bracket with its field-pieces concentric with the armature, substantially as described.

2. In combination with a sewing-machine, a motorarmature mounted upon the main shaft thereof, a yoke-shaped field member and means for rigidly supporting said field member in proper relation to the armature comprising a bracket having a base portion secured to the top of the sewing-machine table, a standard upon said bracket and a clampingbolt securing the lower part of said field memher and bracket rigidly and adjustably together.

3. In combination with a sewing-machine and a motor-armature mounted upon the main shaft thereof, of a field member, and means for adjustably securing said field member in proper relation to the armature comprising a bracket having a base portion adapted to be rigidly bolted to the top of the sewing-machine table, a standard upon said bracket, a slot-like bolt-aperture extending through said bracket, a similar slot-like aperture extending through the field member, said slots being arranged in transverse relation to each other and a clamping-bolt securing said parts together whereby the field member is capable of adjustment in all directions within a given plane.

4. In combination with a sewing-machine,

the main shaft thereof, a motor-armature mounted upon said main shaft and a field member, of means for rigidly supporting said field member in definite relation to said armature and comprising a bracket having a base adapted to be rigidly secured to the sewing-machine table, one or more clampingscrews threaded through said base and arranged to engage an underlying portion of the bed-plate of the sewing-machine head, and means for adjustably but rigidly connecting the field member with said bracket, substantially as described.

5. In an electric motor, the combination with a suitable armature, of a field member comprising an approximately Y-shaped yokepiece, the arms whereof are curved concentric with the periphery of the armature, and fieldwindings mounted upon each of said arms at points between the curved armature-embracing portions and the point of union of said arms, said winding-supporting portions being united with the armature-embracing portions by means of small and relatively slight curved portions, and the yoke-arms being made of such size in cross-section from the windingsupporting portions outwardly to their ends, whereby said windings may be threaded over the arms after the windings are formed, as and for the purpose set forth.

6. In combination with a sewing-machine motor and the main shaft thereof, an electric motor mounted upon said main shaft and a field member comprising a pair of yoke-arms ad justably arranged to extend concentric with the periphery of the armature and field-windings upon said arms, said field-windings being arranged entirely removed from and below the armature whereby the diameter and height of the combined armature and field-pieces are reduced to a minimum, for the purpose set forth.

7. In a sewing-machine motor, the combination with an axially-disposed sleeve member and an armature mounted thereon and hav- 'ing windings of the Gramme type, of a commutator-annulus mounted upon said sleeve and extending in part beneath the windings of the armature, and commutator-brushes arranged to extend radially, and inclined inwardly, to engage at their inner ends the commutator without interfering with the windings, as and for the purpose set forth.

8. In combination with asewing-machine head and the shaft thereof, an electric motor relatively connected with said shaft and provided with a brake-wheel, a brake-bar pivotally supported adjacent to the periphery of said brake-wheel and provided with a handpiece located at that side of the motor toward the operator, and means yieldingly holding said brake normally out of contact with the brake-wheel.

9. In a sewing-machine motor, the combination with the sewing-machine head and the armature and brake-disk mounted thereon, of a field-piece extending adjacent to the periphery of the upper half of the armature remote from the operators side of the machine, a segmental-shaped brake member pivoted to said field pieceand extending forwardly around the periphery of the brake-disk and terminating at the operators side of the armature, an outturned extension on said brake member terminating in a handpiece, and a spring normally holding said brake member out of bearing with the brake-disk,

10. In combination with the rotary armature of an electric motor and a yoke-shaped field-piece extending adjacent to the periphery of the armature, a brake-disk connected to move with the armature, a pivot-stud rigidly mounted upon the field-piece and extending at right angles to the plane of the brake-disk, said stud being parti-circular and flattened at one side, a brake-bar pivotally mounted upon said stud and provided with a plate-spring relatively engaging the flattened portion of said stud and normally holding the brake-bar in definite angular relation to the latter, and means for depressing the free end of the brakelgarkto bring it into bearing with the brake- 11. In an electric sewing-machine motor, means for breaking the armature electrically comprising a manually-operable contact device, a relatively fixed cooperating contact device, and electrical connections for shortcircuiting the armature while retaining the circuit through the fields, substantially as described.

12. In an electric sewing-machine motor, the combination with a brake-wheel moving with the armature and a mechanical brake member or shoe adapted to be applied to the brake-wheel, of an electrical contact device moving with said brake member, a relatively fixed contact member with which the contact member of the brake-shoe is brought into bearing by a movement in the direction to apply the brake, and electrical connections with said contacts whereby the armature is shortcircuited while the fields are retained in circuit when said contact devices are brought ders adapted to cooperate with the shoulders of the sleeve and hand-screw, respectively, and an armature mounted upon said brakedisk, substantially as described.

14:. In a sewing-machine motor, the combination with a main shaft, of a sleeve rigidly mounted thereon provided at its inner end with an annular conical shoulder, a hand-screw threaded into the outer end of said sleeve and provided with a reversely-inclined shoulder, a brake-disk provided with a sleeve extension mounted upon said sleeve and having shoulders adapted to cooperate with the shoulders of the sleeve and hand-screw, respectively, an armature mounted concentrically upon said sleeve extension of the brake-disk and held against movement in one direction by an annular shoulder, a space-sleeve upon said sleeve extension arranged to abut against the armature, and a clamping-ring threaded upon the end of the sleeve extension and acting upon the space-sleeve, substantially as described.

15. In a sewing-machine motor, the combination with a main shaft, of a sleeve rigidly mounted thereon provided at its inner end with an annular conical shoulder, a hand-screw threaded into the outer end of said sleeve and provided with a reversely-inclined shoulder, a brake-disk provided with a sleeve extension mounted upon said sleeve and having shoulders adapted to cooperate with the shoulders of the sleeve and handscrew, respectively, an armature mounted concentrically upon said sleeve extension of the brake-disk and held against movement in one direction by an annular shoulder, a space-sleeve upon said sleeve extension arranged to abut against the armature, a commutator-annulus mounted upon said sleeve extension in bearing with one end of said space-sleeve, and a clamping-ring threaded upon the outer end of the sleeve extension and engaging the opposite side of said commutator-annulus, substantially as described. 16. In a sewing-machine motor, the combination with the main shaft, of a sleeve rigidly mounted-thereon, provided at its inner end with an annular conical shoulder, ahand-screw threaded into the outer end of said sleeve and provided with a reversely-inclined shoulder, a brake-disk provided with a sleeve extension mounted upon said sleeve and having shoulders adapted to cooperate with the shoulders of the sleeve and hand-screw respectively, an armature mounted concentrically upon said sleeve extension of the brake disk and held against movement in one direction by an annular shoulder, a space-sleeve upon said sleeve extension arranged to abut against the armature, a commutator-annulus mounted upon said sleeve extension in bearing with one end of said space sleeve and a clamping ring threaded upon the outer end of the sleeve extension and engaging the opposite side or said commutator-annulus, substantially as dcscribed.

HOMER J. YOUNG.

' Witnesses:

ALBERT H. GRAVES, FREDERICK C. GooDwIN.

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