US1715698A - Electric-motor drive for sewing machines - Google Patents

Description

June 4, 1929. F LD 1,715,698

ELECTRIC MOTOR DRIVE FOR SEW ING MACHINES Filed July 7, 192's INVENTOR ATTORNEY I Patented June 4, 1929.

f UNITED STATES PATENTfOFFICE'.

mm nnnnnrnnnor SPRINGFIELD, MASSACHUSETTS,, AssIGNoR 'ro wns'rme- HOUSE ELECTRIC a manurno'runme COMPANY, A conronarroir or PENNSYL- VANIA.

' nLncrnIc-Mo'ronmmvn non snwme ni AcnInEs.

Application fi led July 7, 1928. Serial No. 291,065.

My invention relates to sewing machines and particularly to electric-motor drives therefor.

.An object of my invention is to provide a relatively simple and reliable motor construction andmounting for driving a sewing machine that shall prevent oil or grease coming into' contact with goods-being sewed.

In practicing my invention, I provide, in

bombination with the usual sewing machine embodying a bed-plate, a goose-neckthereing being shown in elevation.

A sewing machine, designated generally by'. the numeral 11, embodies the usual base or bedplate 12 having thereon a goose-neck 13 comprising a vertically extending portion '14 and a substantially horizontally extending portion 15. A hand wheel 16 is mounted, at one ,end of the gdose-neck, on a shaft (into the frame 23 through an opening parr75 (not: shown) of the type of constructionusually provided in sewing machines of this kind. A stitching mechanism 17 is provided at the other end of the goose-neck, all

of these parts being those usually provided in sewing machines of this kind, particle larly those sold for domestic use.

An electric motor 18 is operatively associated with the sewing machine' and is mounted at the rear of the vertical portion 15 of-the goose-neck-and supported on the.

bedpl'ate 12 b means of a bracket 19 ofsub; stantially s ape;

The lowerportion of the bracket 19 is secured-t0 the bedplate- 12by a plurality of screws 21, and .the motor 18 is secured against the verticalextending portion of the bracket 19 by a plurality of screws 22. Motor 18 embodies 'a frame 23, a

nated core- 24 held thereagainst bysu'itable means, 'not shown in the drawing, field -coils 25 and an armature 26 mounted on a. shaft lami- 27. A fan 28 is mounted on the .outer end of the armature shaft 27 which is rotatably supported in the member 23 by a single relatively long bearing structure 29. Oiling means for the bearing 29 is shown as embodying a wick 31 operatively associated with the bearing, in any manner'well-known in the art, to permit of properly lubricating the shaft andthe bearing..

Apulley 32 is mounted on the outer end of the shaft 27 to be operatively connected to the driven shaft of the sewing machine by means of a belt 33.

A casing 34 of relatively thin sheet metal is operatively associated with the frame 23 to which it is secured by any suitable means well known in the art.

Supply-circuit conductors 35 are provided I to permit ofenergizing the field coils and the armature, the conductors 35' extending tially filled by an electric-insulating bushing 36. I I I While I have illustrated and described a specific embodiment of an electric motor, I

desire here to point out that the details of construction thereof are immaterial, except 1n so far as the single-bearmg feature isconcerned; that is, while I have shown an armature embodying a. commutator, a laminated field-magnet core and concentrated field s5- coils, 1 may use'an alternating-current motor of the inductor or'other type, so long as'a single bearing'structureonly is used.

I am aware that it is not new to d'IIVG sewing machines, and particularly domestic sewing machines, by electric motors, but, to the best of my knowledge and belief, substantially all of these motors embody two bearings, one located at the end of the motor adjacent to the stitching.'mechanismxand to the work being operated upon, and the other bearing located at the other end, away from thecloth and stitching mechanism. I have found that it is almost impossible 'to prevent oil or grease leaking out of the bearing uponsome 'part of the bearin" structure proper or the motor structurew ere it ma be engaged by a piece of cloth being sewe In contradistinction to this, my invention provides a motor en bodying a single-bear-'105- ing structure which is located at that end of the motor away from the stitchin "mechanism so that thereis no' danger o leakage of oil or grease to the outside of the motor motor which is remote from the Stitching S5 at that end thereof adjacent to the stitching mechanism. H

By proper design of the motor, I amenabled to make the frame relatively small and locate it adjacent to the rear face of the vertical portion 14 of the goose-neck so that, as shown more particularly in Fig.

1 of the drawings, it will not project appreciably therebeyond "and occupy space which is normally provided by the designer of the sewing machine for the cloth or material being operated upon. v

The device embodying my invention comprising a single-bearing motor and its mounting, thus provides a relatively simple and highly efiicient means for preventing oil and grease from leaking out of a bearing where it can be engaged by cloth being sewed.

Since various modifications may be made in the device embodying my invention with- I out departing from the spirit and scope thereof, I desire that only such limitations shall be placed thereon as are imposed-by the prior art or are set forth in the'appended claims.

I claim as my invention 1. In a sewing-machine having a,bedplate, a goose-neck thereon, and the usual stitching mechanismat the outer end of the goose-neck, a motor embodying a driving I shaft'and asingle bearing only therefor, the bearing being located on that end of the mechanism.

2. In a sewing machine having a bedplate, a goose-neck thereon,a driven shaft therein and the usual stitching mechanism at the outer end of the goose-neck, an electric motor mounted on the hedplate and embodying an armature shaft extending parallel to the driven shaft and a single armatureshaft-bearing only, located on that end of the motor remote from the stitching mechanism. Y.

3. In a sewing machine having a bedplate, a goose-neck thereon, a driven shaft therein "and the usual stitching mechanism at the.

outer end of the goose-neck, an electric motor mounted at the rear of the vertical portion of the goose-'neck and embodying a single bearing only, said bearing being located on that end of the motor. remote from the stitching mechanism.

4. In a sewing machine having a. bedplate', a goose-neck, an electric motor mounted at the rear of, and substantially covered by,

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