US1488234A - Electrically-driven sewing machine - Google Patents

Description

- INVENTOR v v ATTORNEY 3 Sheets-Sheet l.

4'Filed sept. s. 1921 F DIEHL ET AL ELECTRICALLY DRIVEN SEWING MACHINE March 25 1924.

F. DIEHL ET AL ELECTRICALLY DRIVEN SEWING MACHINE March 25 1924.

3 sheets-sheet 2 Filed Sept. 1921 INVENTOR ATTORNEY 3 sheets-sheet ATTORNEY March 25 1924,

' F. DIEHL ET AL ELECTRICALLY DRIQEN SEWING MACHINE Filed sept. s, 1921r WITNESSE 015%? Mm-MMM Patented Mar. 25, 1924.

UNITED STATES i l1,488,234 PATENT ori-fica] FREDERICK DIIEHLA ANDMARTIN HEMLEB, OF ELIZABETH, NEW JERSEY, ASSIGNORS T0 THE SINGER'MANUFACTURING COMPANY, 0F ELIZABETH, NEW JERSEY, A COR- PomrrIoN or NEW JERSEY.

ELECTRICALLY-DRIVEN SEWING MACHINE.

Application nled September 3, -1921. Serial No. 498,316.-

T 0` all wtmr t'lfvaay/ concern.'

' B'e it known tlia'twe, FREDERICK DIEHL and MARTIN HEMLEB, .citizens of the United States, residing at Elizabeth, in the county ofy Union and' Stateof New Jersey, have invented certain new and useful Improvevments in. Electrically-Driven Sewing Machines, of which the following is a specilication, reference being had therein to the accompanying drawings. v l

Heretofore it has been common to adopt 'in av sewing -machine driving attachment an electric motor of usual form and of suiiicient dimensions to provide the requisite driving power, and to mount such motor upon the sewing machine frame by means of a supporting bracket made in pivotally connected sections or otherwise in such manner as to permit the motor to be shifted from driving position to an inoperative position beneath the overhanging arm of the sewing machine frame vfor transportation purposes or when the machine was housed in a suitable carrying case or cabinet when not required for operation. In the few instances in the -prior art where in a-n eleortricallydriven sewing machine the driving vrelation* between the motor and the machine did no@` have to be disturbed for housing purposes when the machine was not in use, the machine construction has had to be altered to receive the motor, as by having its frame recessed or its mechanism provided with special fittings or parts. In certain of these instances, even with the use of such special parts, the motor was obstrusive and in the way of the operator and of the ap plication and use of many of the usual sewing machine attachments and appurtenances. Y

The present invention has for certain of its objects to provide an electrically driven sewing machine, the motor of which and its means of attachment to the machine-frame are simple in construction and so formed and related to the machine-frame as to require no adjustment of the motor by the user for restoring temporarily interrupted driving relation with the sewing mechanism preparatoryto operation.

Another object of the invention is to provide a machine of the class described the motor of which shall be unobtrusive and in. conspicuous but attractive lin appearance when in position, and s o compact as to enable the machine to which it is applied'to occupy a housing cavity in a portable carrying case or drop-head cabinet of the same minimum capacity as is required -for the same machine when furnished to be 'manu- `ally driven and thus unprovided with .a

motor.

A feature of the invention resides. in the combination of a sewing machine frame having a standard of hollow fiattened crosssection with a hollow attened motor frame,

one flattened side of each being'juxa d,

whereby maximum strength and ity is had while the motor is located above and close to the machine bed and belov7 the sewing machine shaft, affording maximum compactness and in the present embodiment maxlmum length of belt-drive.

A further object ofthe invention i is' to provide a motor-driven sewing machine of standard type, including either the usual drop-head cabinet or a portablecase, the motor element of which is applied without altering the construction of the machine, and is of such nature that the motor may remain at all times in driving relation with the sewing hea-d, that is, such relation need not be disturbed to enable the sewing head to be housed in its drop-head cabinet or. portable case.

Still' further,`the `invention has for an object to so combine the motor and sewing machine that the motor will be unobtrusive and out of the way of the operator when using the machine andV will not obstruct the space under or directly in rear of the overhanging bracket-arm needed `for accommodation of thework or usual sewing machine appurtenances.

The invention is embodied in a machine of standard type equipped with an electric motor having an armature and field-coil encircling fra-me which is externally reduced in diameterl and flattened on'the sides containing theV field-magnet pole-pieces; the motor-frame being attached to a supporting bracket in the form of an arm provided with means whereby it may be secured to the sewing machine frame permanently in driving position. The sewing machine frame standard is preferably of flattened cross-seo tion and is formed with a lateral seatto which the motor-supporting bracket is secured preferably by an interlocking tongue-andi groove connection, and the adjacent flattened face of the motor frame is disposed in substantial parallelism with and in close proximity to the rearward side ,of the standard, so that the opposite flattened fac-cof the motor-frame extends little, if any, be-

yond the edge of the machine base or bedp. VUe.

As so equipped, the sewing machine occupies hardly more space in a. container than a machine unprovided with an electric-motor drive, and the attachment is of such orm and lies so close to the sewing machine frame standard as to be comparatively inconspicuous while presenting a pleasing appearance. The permanence of the motor mounting obviously insures security against vinjury of the outfit when boxed for shipment'and thus renders practicable the assembling of the motor and machine at the factory in readiness for use.

So far as we are aware no electric sewing machine has heretofore been constructed of which the motor element is applied without al-teration of the sewing machine and is permanently associated in unobtrusive driving relation with such machine; it being unnecessary to disturb such relation when the machine is housed for transportation or is housed in the usual carrying case or drop-head cabinet when not in use;

ln the accompanying drawings, Fig. 1 is an end view of a sewing machine and driving motor attached thereto in accordance with the present invention, the machine being shown mounted in a portable carrying case. Fig. 2 is a plan' ot' the drivin@r attachment with a portion of the mac ineframe, in transverse section through the standard. Fig. 3 is a rear side elevation representing the motor attachment and `that portion of the sewing machine adjacent thereto. Fig. 4 is an elevation showing the sewing machine and its driving attachment as applied Ito a drop-head cabinet. Fig. 5 is a longitudinal sectional elevation of the m0v tor and Fig. 6 a. transverse section of the same. Fig. 7 is a view representing, in section, the connection 0f the motor-frame and its supporting bracket.

In the preferred embodiment ot the invention, as illustrated, the sewing machine is constructed with a trame comprising the base or bed-plate 1 from whiclrrises the hollow standard 2 having the overhanging tubular arm 3 extendingr therefrom. The standard 2 is of flattened cross-section, Fig. 2, that is, its dimension transversely of the sewing machine bed-plate 1 is less than it-s dimension lengthwise of the bed-plate. Mounted within and longitudinally ot the arm 3 is the main-shaft 4- upon which is mounted the balance-wheel 5 provided with the belt-groove 6. The standard 2 of many sewing machines is customarily formed at the side adjacent the end ot the bed-plate with a raised seat 7 and rib 8 to receive a hand driving device. ln the present instancel it is convenient to use this seat to mount the motor by fitting to such seat the correspondingly grooved and apertured cross-member 9 of a motor-supporting bracket 10 which is ixedly secured in position thereon by means of the screw 1l. The bracket 10 is shown in .the forni of an angular arm one portion of which is secured to the bracket-armstadard and to the other or angularly related portion of which the motor frame is secured. The motor-supporting portion of the bracket may be in the form of a rearwardly `and upwardly inclined arm 12v grooved similarly to the cross-member Sand applied to a seat 13 having the i raised ytongue .14 entering said groove provided 'upon the outer face ot' the end-cover 15 of the driving motor, the endcover being secured to the bracket by means ot' a fastening screw 16 entering one of a plurality of apertures in the bracket-member 12 and tapped into the vend-cover 15.

The frame of the motor comprises the endcover 15 and a similar cover 17 between which are clamped the series of field laminations 18 by means of the screw-bolts 19. The field-frame is shown embraced by a sheet-metal casing 20. The laininations 18 aie provided with the inwardly extending projections 21 together forming the polepieces intermediate which is disposed the armature 22 whose shaft 23 is journaled in suitable bearings 24 therefor in the endcovers in substantial parallelism with the main-shaft et. The armature is shown provided with the commutator 25 against which are pressed by means ot springs 2G the brushes 27 slidingly fitted within the incltallic tubular casings 2S sustained by the insulating bushings 29 mounted within the end-cover 17.

The laminations 18 are apertured to encircle thc armature and are externally reducedin diameter and flattened upon the sides formed with the pole-pieces 21, as rep-` resented in F ig. G, and the pole-pieces are `surrounded by the usual coaxial field-,coils 30. As shown, the motor-supporting 'arm 10 extends beyond and transversely ot' the inner flattened face of the motor-frame.

To permit the flattening of the field-trame as described without seriously reducing the section of the magnetic path, relatively wide pole-pieces 21 are provided. Upon ratei-ence to Fig. 6 it will be clearly seen that these relatively wide pole-pieces join the annular upper and lower portions ot the yoke at points abnormally' spaced apart and thereby provide a sufficient area at the points a to insure a suitable flux density at these points.

`bed-plate 1.

the balance-wheel 5 on the main-shaft 4.`

The belt may .be maintained taut by a grooved idler-pulley 33 journaled by means of a screw-stud 34 upon the swingmg arm 35 mounted upon the fulcrum-stud'36 which j is tapped into the motor end-cover 15 and is pressed toward the belt by mean-s of a spring 37. i

As represented in Fig. 1., the sewing ma chine bed-plate is hinged at 38 within the usual hollow base 39 of a carrying case to which is applied the removable cover 40 made only slightly larger in width than the Were the motor frame of the usual rounded form, it would extend laterally so far rearward of the sewing machine frame standard that the supporting bracket-arm 10 Jwould require to be longer and the bod ther from t,e standard, thereby requiring a much larger housing cavity for the machine and necessitating the employment of a much wider cover than for a sewing ma chine furnished without the driving attachment.V By fiattening the motor frame, not only is the body of the motor permitted to be positioned closer to and iny substantial parallelism with the adjacent face of the machine standard, but its lateral dimensions are so reduced that it is embraced substantially within the area of the sewing machine bed-plate and is therefore accommodated within a housing cavity customarily inade of the minimum dimensions for a'sewing head regardless of accessories.

The sewing machine is represented in Fig. 4 as applied to a dropfhead cabinet constructed substantially in accordance with the disclosure of the United` StatesPatent to Diehl and Kraemer No. 541,474, of June 25, 1895; being illustrated in full lines in the position which it occupies when the cabinet is closed and in dotted lines in operative or sewing position. In this representation of the improvement, the sewing machine bedplate has the same form of hinge connection 38 with the apertured table-top 41 beneath which is the cavity 49. in which the machine is housed when not in use, the cavity being -closed at the top at such time by the cover leaf 43. In this outfit the compactness of the ,motor attachment is emphasized, the motor being mounted sufliciently close to the machine-standard to enable the outer face of the field-frame to lie within the aperture and below the face of the table-top 41, so that the cover-leaf 43 may be closed with out interference therewith. A

It will be seen that the field-coils 30 and pole-pieces of the motor are so related to the sewing machine standard that the axis or center line of magnetic `iiux through the of the motor positioned fariield-coils is transverse to the exterior fiattened sides of the motorV and to the juxtaY posed sewing machine standard and cover The field-coils areA thus effectively disposed of in the limited space between said walls without sacrifice of motor characteristics desirable in an electric sewing machine.

Having thus set forth .the nature of the invention, what we claim herein is- 1'. The combination with a sewing machine having a frame formed with a bed and a hollow bracket-arm standard, and a main-shaft sustained by said frame, of a motor permanently mounted in driving osition on said frame andat all times having its power-shaft below the --level of and substantially parallel with the sewing machine shaft, said motor having an armature and field coils and a motorframe encircling and enclosing said armature and field coils and externally flattenedv vertically at opposite sides of the motor-shaft and` disposed with one lof its flattened faces closely adjacent to the standard.

2. The combination with a sewing niachine haviiiga frame formed `with a bed, an overhanging bracket-arm, and a hollow bracket-arm standard, and a main-shaft sustained by said frame, of a motor mounted on said frame below the level of the overhanging bracket-arm and at all times having its power-shaft substantially parallel with and in permanent driving relation with' the sewing machine shaft, said motor having an armature and a motor-frame encircling said armature and provided at opposite sides with internally disposed coaxial fieldcoils, said motor-frame being externally attened transversely of the axis of said field coils on the sides adjacent the respective coils and disposed with one of its flattened faces closely adjacent said standard.

3. In combination, a sewing machine comprising a frame formed with a bed, a standard rising therefrom and an overhanging. arm extending from the standard, and Aa main-shaft extending lengthwise of and sustained by said arm, said standard being formed with a' seat, a rigid motor-bracket secured tosaid seat, anda motor having an armature operatively connected with said main-shaft and a frame encircling said arizo end thereof the lield-lrame with one of its flattened t'aces disposed transverse to said arm and having the. other end ot said arm provided with means tor its rigid attachmenty to a sewing machine `l'rame. Athe motor heing' bodily adjustable lengthwise of said arm while maintaining its tlattened faces in parallel planes transverse to said arm in all posit-ions ot' adjustment.

5. The conibination with a sewing machine having a frame 'formed with a hollow lnacltet-arm standard and a main-shaft sustained hy said traine, ol a motor heit-connected to drive said main-shaft. and having a lield frame flattened vertically at opposite sides and disposed with one of its flattened lfaces adjacent said standard, said motor heing rigidly mounted on the sewing machine trame and being liodily adjustablel toward and lfrom said standard while maintaining it.' llattened sides vertical in all positions oi adjustment.

An electric sewing machine havingr` in eonihination, a sewing head including a trame formed with a llat rectangular hed and an overhanging ln'aeliet-arm having a hollowstandard ot llattened cross-section with its shorter dimension transversely ot the. machine bed and its longer dimension longitudinally ot the machine bed, a mainslial't joivrnaleld in said bracket-arm` a halance-wheel mounted on said main-shalt, an electric motorrmounted on the sewing machine trame iu permanent driving position al,ove the sewing machine bed and below the level ot' said main-shal't. said motor having an armature and power-shaft and a hollow armature-encircling trame externally tlattened vertically at opposite sides ot' said armatnre and disposed permanently wiih one ot its flattened sides in rear of and closely adjacent the rearward side ot the iiattened bracket-arm standard.

T. An electric sewingl machine outfitv comprising, in combination, the usual sewing head housing means. a sewing head adapted to he housed hy said means and including a traine formed with a flat rectangular hed and an overhanging bracket-arm having a hollow standard ot' flattened cross-section with its shorter dimension.transversely of the machine hed and its longer dimension lengthwise of the n'iaehine. bed, a main-shaft journaled in said bracket-alan, a balancewheel mounted on said'main-shaft, and an electric motor mounted upon the sewing machine traine above. the sewing machine bed and below the level of said main-shaft, said motor having an armature and power-shaft and a hollow frame encircling said arn'iature and power-shaft, said motor-trame being externally flattened vertically at opposite sides otl said power-shaft and disposed at all times with one ot its flattened sides in rear of and closely adjacent the rearward side of the flattened hracket-arm standard, and a pulley on said power-shaft in permanent driving re,- lation with the. sewingmachine balancewheel; the sewing head and its driving motor being receivable as a unit within said housing means without the necessity ot disturbing the driving relation oit' the motor to the sewing head.

S. The combination with a sewing head having` a traine. toi-med with a substantially flat bed, a hollow standard rising from said bed, an overhanging bracket-arm joined at one end to saidstandard, a main-shaft, and housing means including a cover having a wall spaced from the rear wall of said standard, ot a motor having a pair of coaxial tieldscoils disposed between and with their axis transverse to said walls, a hollow motorlramc encircling and enclosing said fieldcoils and having inwardly directed polepieees passing through said tield-coils, said motor-frame being externally flattened at opposite sides adjacent the respective ield-eoils and disposed withits flattened sides in juxtaposition, respectively, to said standard and cover walls, and a motor-armature and power-shaft journaled in said motor-frame and at all times connected in driving relation to said sewing machine main-shaft.

In testimony whereof, we have signed our names to this specification.

FREDERICK DIEHL. MARTIN HEMLEB.

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