US2464079A - Sewing machine specifically adapted for domestic use - Google Patents

Description

March 8, 1949. F. GEGAUF 2,464,079

' SEWING MACHINE SPECIFICALLY ADAPTED FOR DOMESTIC USE 2 Sheets-Sheet 1 Filed Feb. 14, 1945 7 4 I I, I I

March 8, 1949.

F. GEGAUF l SEWING MACHINE SPECIFICALLY ADAPTED FOR DOMESTIC USE.

2 Sheets-Sheet 2 Filed Feb. 14, 1945 Patented Mar. 8, 1949 SEWING MACHINE SPECIFICALLY ADAPTED FOR DOMESTIC USE Fritz Gegauf, Steckborn, Switzerland, assignor to Fritz Gegaufs Siihne Aktiengesellschaft, Steckborn, Switzerland Application February 14, 1945, Serial No. 577,805

In Switzerland April 11, 1944 12 Claims.

This invention relates to sewing machines particularly for domestic use provided with a freely projecting arm containing the shuttle. Such sewing machines have been put into use particularly in households for the reason that they permit of conveniently mending that kind of stockings which can be pulled over or pushed on the projecting arm of the machine, so that the otherwise conventional rolling of the stocking to be mended on a mending ring (darnlng ring) can be done away with. On the other hand it is necessary that with such a machine all mechanical sewing operations likely to arise in households can be carried out so that it must be possible to work in such machines with very thin and also very thick thread material and with fabrics from the thinnest up to the thickest kind.

For this purpose the shuttle mechanism commonly known as a central spool shuttle has proved to be the most advantageous, due to being the least sensitive when applied to any of the yarns and fabrics to be employed with a view to effecting perfect stitching. This shuttle mechanism in which the shuttle performs an oscillatory rocking movement of an angular range of minimum 220 has a certain space requirement in the axial direction of the shuttle driving member which requirement is further increased by that of the movement transmission means for the fabric member, which has to be arranged in the immediate vicinity of the drive, and of the mounting means for the shuttle driving member. That type of fabric feed member has proved to be the most reliable which operates by performing rectangular motion.

In order to be able to mend or sew in the sewing machine stockings, sleeves and so forth the openings of which are relatively small the cross sectional contour of the freely projecting arm of the machine including the shuttle must remain within corresponding limits. The difficulties resulting from this requirement in respect of the construction to be chosen, that is, the accommodation of the movable parts previously referred to Within the limited hollow space of the projecting machine arm are still increased in the event that in such a sewing machine the shuttle is to be so arranged that its axis extends transversely to the longitudinal axis of the projecting arm for the purpose of providing for the needle bar, apart from reciprocating in the vertical direction, to perform in addition a transversely reciprocatory movement, thereby to permit of efiecting zigzag stitching.

In the sewing machine according-to the present invention a mounting shaft isarranged which is transversely mounted in the projecting arm and is provided with an overhung part which carries the shuttle driving member and a gear which is built into said member, the gear intermeshing with a rack which causes the shuttle driving member, to perform oscillatory rocking movements.

This arrangement results in such a saving in available cross sectional area of the projecting arm of the sewing machine that this cross sectional arm area satisfies the requirements of practice referred to in the opening paragraphs. Consequently the machine can be equipped with a central spool shuttle and with a fabric feed member operating by performing rectangular motion and with a device for eifecting zigzag stitching. v

An embodiment of the present invention representing a sewing machine according to the same is illustrated by way of example only in the accompanying drawings in which Fig. 1 shows a longitudinal sectional elevation of the machine according to the present invention;

Fig. 2 is a plan view of the projecting machine arm with the inner parts thereof exposed;

Fig. 3 shows a longitudinal section of the front end of the projecting machine arm;

Fig. 4 shows a larger scale cross section of the said projecting arm within the embrace of the looper driving member;

Fig. 5 is a partial vertical cross sectional view of the machine, and

Figs. 6 and 7 represent partial vertical longitudinal sections of the projecting arm of the machine.

In the drawings a table board supported sewing machine is depicted which has a base plate I for carrying the machine casing 2 which is provided with an upper cantilever arm 3 and with a lower freely projecting arm 4 which is arranged counter position to the former arm and includes the two-armed shuttle driving member 5. The latter serves for driving a central spool shuttle (not shown) relative to which, in the operation of the machine, the mounting axle 6 of the shuttle driving member 5 performs an oscillatory rocking movement through an angular range of about 220 by means of a gear 1 which is built into the shuttle driving member 5 in the manner as shown in Fig. 4' and which is in mesh with teeth on the under side of a rack bar 8. The rack bar 8 is longitudinally displaceably arranged in thelongitudinal direction of the projecting arm 4 by means of a guide 9.

The mounting shaft or axle B, which is transversely arranged in one of the side walls of the arm 4, carries by means of an overhung portion thereof the gear 1 and the shuttle driving member 5 which is supported by a connecting strip between the gear I and a flange 5' on the axle 6. The gear I, the shuttle driving member 5 and the flange 6' are connected to each other and thus to the axle 6 circumferentially thereof by connection elements, such as pins 6" or keys, so as to be rigidly united with said shaft. On the front end of the overhung part of the mounting shaft 6 a covering I is detachably connected by means of a screw H! which exerts pressure on the face of the gear I fitted thereto by means of a conical face, so that the gear 1 and the shuttle driving member are firmly urged against the stop or bearing surface presented by the flange 6' of the axle.

On the removal of the screw III which is sunk in a central depression in the covering disc ill the parts ID, I and 5 can be dismounted from the mounting shaft 5. The diameter of the coverin disc I0 is larger than that of the gear I and is situated so close by the rack controlled gearing I, 8 as to protect the latter within its embrace against lateral access of thread waste and foreign matter to said gearing. On the shuttle guideway carrier casing II or as hereinafter briefly termed, shuttle guide casing, on the apertured side of said casing adjacent to the shuttle guideway a protecting ring H is arranged which is forced against the immovable shuttle guide casing by means of a leaf spring 12 of a pivotal stirrup l3 and is thus secured in position.

The pivotal stirrup l3 which is mounted on a pivot bolt l4 and is provided with two upwardly extending shanks has a stop pin l5 connected to one of said shanks for the purpose of retaining the pivotal stirrup [3 in operative position by cooperation with a spring retaining arm [6. On the pivot bolt I4, which engages in the stationary wall of the projecting arm 4 of the machine, is further mounted a pivotal cover I! which in the closed position shuts an opening which is arranged in a longitudinal side of the said projecting arm 4 opposite to the mounting axle 6 and provides for access to the shuttle (not shown) located in the shuttle driving member 5 as well as to the spool.

The pivotal cover I! is retained in closed position by means of a latch l9 which engages under the head of a set screw I8 on said lid (Figs. 1 and 2), said latch l9 being maintained in operative position by a coiled spring 20. This latch l9 has a head 2| positioned in a recess which is provided on the front face of the wall of the said projecting arm 4 so that by exertion of pressure by a finger of the hand on the head 2| from without the latch I9 can be pivotally displaced so as to release the set screw l8, whereupon the pivotal lid I1 swings automatically downward by action of its own weight about th pivot bolt I4 into the chain-dotted open position as shown in Fig. 4.

Subsequently, by correspondingly forcing back the spring retaining arm IS the stop pin 15 provided on the pivotal stirrup l3 can be given free passage, whereupon the pivotal stirrup l3 swings out from the operative position into the position shown in chain-dotted lines in Fig. 4, due to relaxation of the leaf spring 12, and the protecting ring II can be detached from the shuttle guide casing H, thereby completely to clear the access 4 to the path of movement of the shuttle, for example, for the purpose of cleaning the shuttle guideway.

Due to the fact that the rack 8, which serves for moving back and forth the gear 1 of the shuttle driving member 5, meshes with its lower tooth system in the gear 1, thread waste as well as foreign matter, that may have come within the range of the rack controlled gearing can drop out downwardly. As on the other hand the covering disc [0 practically prevents foreign matter from laterally intruding into the rack controlled gearing l, 8 the latter is safeguarded against disturbing influence by foreign matter. The pivotal stirrup Hi can, if desired, be separately mounted, by being arranged together with the pivotal cover I! on one and the same pivot bolt. Instead of providing a single curved leaf spring I2 on the pivotal stirrup l3, several individual springs may be provided for the purpose of elastically forcing the protecting ring II against the looper guide casing II.

The described mode of arranging and constructing the drive for the shuttle driving member 5 warrants the use of the central spool shuttle and of a fabric feed member performing the usual rectangular movement. In Figs. 2 and 4 the numeral 22 design-ates the fabric feed member which is mounted on two supporting arms 24 by means of a rockable axle 23 and is moved up and down by a roller carrier lever 21, when the machine operates. The roller carrier lever 21 which is fixed to a shaft 28 is swung back and forth by a second roller carrier lever 29, which is also connected to the shaft 28, from the topside of a control disc 30. The control disc 30 is secured to an upstanding shaft 3! and has its underside operatively connected by means of a link 32 with the rack 8 which has the reciprocatory motion imparted to it in this way, whereby the gear I and consequently also the shuttle drive member 5 together with it is correspondingly oscillated. The upstanding shaft 3| is rotatively connected at the top by means of a bevel wheel drive 33 with the driving shaft 34 from which by means of a crank 35 and a link 36 the up and down movement of the needle bar 31 is effected.

The needle bar 3'! is mounted in an upper and a lower guide 38 and 39 respectively of a rockable holder 40 which in turn can be rocked by means not shown about a vertical shaft if by means of the needle 4| a zigzag stitching is to be eifected instead of a normal stitching. The fabric feed member 22 carries on its topside, advantageously, rectilinear serrations in the same manner as in sewing machines that are devoid of a projecting arm. The end face of the projecting arm 4 is shaped similar to a darnin ball. In this connection the embossed end face of the projecting arm 4 is situated so close by the needle opening of the throat plate 55 and is so dimensioned as to permit of conveniently mending stockings even at the tip of their toe portions if the stockings are appropriately pulled over the freely projecting arm 4, due to the fact that in said arm the precedingly mentioned parts of the actual sewing mechanism can be accommodated in a relatively small space.

On the driving shaft 34 a cam disc 42 (Figs. 5 and 1) is fastened which is situated between forked arms of a two-armed lever 43 and swings said lever back and forth about an axle, that is, a bearing pin 44, when the sewing machine operates, this swinging movement being transmitted from the swingable lever 43 to an arm I 45 and thereby to a shaft 46 on which in addition to said arm 45 are secured the two supporting arms 24 carrying the rockable axle 23 of the fabric feed member 22 and forming together a self-contained unit as shown in Fig. 3. By this means the fabric feed member 22 is reciprocated transversely of the shaft 49 so that said member in conjunction with the vertical reciprocatory movement imparted thereto by the roller carrier lever 21 (Figs. 4 and 1) effects the rectangular motion required for the appropriate feed of the fabric, that is, the sewing work.

The bearing pin 44 of the swinging lever 43 is arranged on a slide block 41 (Figs. 1 and 5) which is situated in a cross groove 48 of a settable body 49 which carries a bearing stud 59. On the settable body 49 a handle 5| is fixed which projects out of the machine casin 2 and through which the settable body 49 can be turned in unison with its bearing stud 50 to a restricted extent and can thus be accordingly adjusted relative to a scale which is arranged on an arcuate segment 52. Associated with the scale is a stationary mark which is arranged on the outside of the casin 2 at a window 53 through which the adjustment of the settable body 49 at the time being is visually exhibited. As will be seen from Fig. 1 a hand controllable screw 54 engages in a conical recess in the settable body 49 and extends with its threaded portion into a screw bore in the machine casing 2. By inserting the point of the hand controllable screw 54 into the conical recess in the settable body 49 more or less the range of movement of the swinging lever 43 is more or less restricted. By

this means the length of stitch in the sutures is defined in that by the swingable lever 43 the fabric feed member 22 has reciprocatory movement imparted thereto via the arm 45 and the shaft 46.

To the driving shaft 34 is correlated a belt drive 56 (Fig. 1) which by means of a further belt drive 57 is operatively connected with an electric driving motor (not shown). This driving motor is positioned laterally of the machine casing on one of the longitudinal sides of the latter.

I claim:

1. In a sewing machine having an oscillatory shuttle driving member, in combination, a machine base, a freely projecting hollow arm provided on said base for Work supporting purposes, a shaft mounted in said arm in transverse relation thereto, said shaft having a portion extending into the interior of said arm in overhung relation to said interior and carrying the shuttle driving member, a gear on said driving member, and a rack cooperating with said gear for oscillating said shuttle driving member.

2. In a sewing machine particularly for domestic use, in combination, a machine base, a freely projecting hollow arm provided on said base for work supporting purposes, a mounting shaft mounted in said arm in transverse relation thereto, a shuttle driving member, a gear on said driving member, said shaft having a portion extending into the interior of said arm in overhung relation to said interior and carrying the shuttle driving member, a covering disc detachably arranged on the end face of said overhung shaft portion, a shoulder provided on said shaft portion, said disc tending to urge said gear and said driving member in the axial direction against said shoulder, and a rack cooperating with said gear for oscillating said shuttle driving member.

3. In a sewing machine, in combination, a machine base, a freely projecting hollow arm provided on said base for work supporting purposes, a shuttle driving member, a shaft mounted in said arm in transverse relation thereto and having a portion extending into the interior of said arm in overhung relation to said interior and carrying the shuttle driving member, a gear on said driving member, a covering disc detachably arranged on the end face of said overhung shaft portion, a conical face carried by said disc, a shoulder provided on said shaft portion, said disc tendin to urge said gear and said driving member in the axial direction against said shoulder by cooperation of said conical-face with said gear, and. a rack engaging with said gear for oscillating said shuttle driving member.

4. In a sewing machine, in combination, a machine base, a freely projecting hollow arm provided on said base for work supporting purposes,

' a shuttle driving member, a shaft mounted in said arm in transverse relation thereto and having a portion extendin into the interior of said arm in overhung relation to said interior and carrying the shuttle driving member, a gear on said driving member, a covering disc detachably arranged on the end face of said overhung shaft portion, a conical face carried by said disc together with a seat for a central connecting screw head, a shoulder provided on said shaft portion, said disc tendin to urge said gear and said driving member in the axial direction against said shoulder by cooperation of said conical face with said gear, and a rack cooperating with said gear for oscillating said shuttle driving member.

5. In a sewing machine, in combination, a machine base, a freely projecting hollow arm provided on said base for work supporting purposes, a shuttle driving member, a shaft mounted in said arm in transverse relation thereto and having a portion extending into the interior of said arm in overhung relation to said interior and carrying the shuttle driving member, a gear on said driving member, a covering disc detachably arranged on the end face of said overhung shaft portion, a shoulder provided on said shaft portion, said disc tending to urge said gear and said driving member in the axial direction against said shoulder, a rack cooperating with said gear for oscillating said shuttle driving member, said rack having teeth on its under side for intermeshing with the top portion of the teeth on said gear, said covering disc protecting the rack drive formed by said gear and said rack against access of foreign matter.

6. In a sewing machine, in combination, a machine base, a freely projecting hollow arm provided on said base for work supporting purposes, a shuttle driving member, a shaft mounted in said arm in transverse relation thereto and having a portion extending into the interior of said arm in overhung relation to said interior and carrying the shuttle driving member, a gear on said driving member, a covering disc detachably arranged on the end face of said overhung shaft portion, a shoulder provided on said shaft portion, said disc tending to urge said gear and said driving member in the axial direction against said shoulder, connection elements arranged on said shoulder interconnecting said gear and said shuttle driving member circumferentially thereof into a rigid unit, and a rack cooperating with said gear for oscillating said shuttle driving member.

associated with said. pivotal cover, cover, whenin closed position, resiliently maintains said protecting ring in position of confining said guideway, and a rack cooperating with said gear for oscillating said shuttle driving member.

- poses-ashuttle'driving'member, a shaft mounted in said-arm in transverse relation'thereto and having 'a'portion extending into the interior of said arm in overhung relation to said interior and carrying the shuttle driving member, a gear on said driving member, -a shoulder fixed to said shaft portion, pin-like connection elements secured tosaid shoulder and arranged to interconnect said gear and said shuttle driving mem- -ber,'thereby-providi-ng a rigid unit between said gear, said driving member and said shaft portion, anda rack cooperating with said gear for oscillating said shuttle driving member.

8. In as'ewing machine, in combination, a machine base, -a 'freely projecting hollow arm provided on said base'for work supporting purposes, a shuttle driving member, a shaft mounted or in said arm'in transverse relation thereto and having :aportion extending into the interior of said arm in overhung relation tosaid interior and carrying the shuttle driving member, a gear on said driving member,-a side of the hollow arm having an aperture opposite to said driving member and said gear, a pivotal cover arranged in front of 'saidaperture in: said side wall for giving free access to said driving member through said aperture; and a rack cooperating with said gear for oscillating said shuttle driving member.

9. In :a sewing machine, in combination, a

machine base, ia freely projecting hollow arm provided onisaid base for work supporting ,purposes, a shuttle driving member, an axle mounted in saidarm 'in'transverse relation thereto and having a portion extending into the interior of I said arm in overhung relation to said interior and carrying the shuttle driving member, a gear on Y said driving member, a shuttle guidecasing carrying a shuttle guideway for cooperation with said shuttle driving member, said hollow arm having an aperture in one side-wall opposite to said drivi'n'g member :and saidgear, a protecting ring arranged in'front of "said guideway for confining -said'guideway adjacent said aperture'd side wall "opposite to said aperture remotefrom said axle portion carrying said driving member and gear, a pivotal cover arranged infront of said aperture in 'said. sidewall for giving free access to said driving member throughsaidaperture, spring means so that the 10. In a sewing machinaincombihation, a

'ma'chinebase, a freely projecting hollow'arm provided on-said base forwork supporting purposes, ashuttle driving member, a shaft mounted in said arm in transverse relation thereto and having a portion extending into'the interior of said arm in overhung :relation vto said interior and carryngithe'shu'ttle driving member, a gear onv said driving member, a shuttle guide casing carrying a shuttle guidewayfor coopera'tion'with "saidshuttle drivingmemb'er, a protecting ring confining said-shuttlefguideway on the side of said guideway remote from said shaft portion carrying said driving member together with said gear, spring means resiliently urging said protecting ring against sad shuttle guide casing,

on said'driving member, a shuttle'guide casing carrying a shuttle guideway'for cooperation with said shuttle driving member, a protecting ring confining said shuttle guideway on the side of said guideway remote from'said shaft portion carrying said driving member togethertwith said gear, spring means resiliently urging said protecting ring against said shuttle guide casing, a pivotal stirruparranged toforce said protecting ring against said shuttle guide casing, and a rack cooperating with said gear for oscillating said shuttle driving member.

12. Ina sewing machine, incombination, a machine base, a freely projecting hollow arm provided on said base' for work supporting. purposes, a shuttle driving member, an axle mounted in said arm in transverse relation thereto and having a portion extending into the interior of said farm in overhung relation to said interior and carrying the shuttle driving member, a gear on said driving member, a shuttle guide casing carrying a shuttle guideway for cooperation with said shuttle driving member, a protecting ring confining said shuttle guideway 0n the side of said guideway remote from said axle portion carryin'gsaid driving member together with said gear, spring means resiliently urging'said protecting ringaganst said shuttle gude casing, a pivotal stirrup arranged to force said protecting ring against said shuttle guide casing, a side wall portion on said projecting hollow arm having an aperture permitting access to said pivotal stirrup,

REFERENCES CITED The following references-are of recordin the file ofthis patent:

UNITED STATES" PATENTS Number Name Date 1,300,843 Kaumeyer et al. Apr, 15, 1919 2,325,467 Beyer July 27,1943

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