US2430932A

US2430932A - Sewing machine

Info

Publication number: US2430932A
Application number: US451422A
Authority: US
Inventors: Richard K Hohmann
Original assignee: Sears Roebuck and Co
Current assignee: Sears Roebuck and Co
Priority date: 1942-07-18
Filing date: 1942-07-18
Publication date: 1947-11-18
Anticipated expiration: 1964-11-18

Description

Nov. 18, 1947.q R. K. Hol-MANN SEWING MACHINE v Filed July 18, 1942 5 Sheets-'Sheet 1 E W M Nov. 18,1947.. R. K. HOHMANN SEWING MACHINE Filed July 18, 1942 5 Sheet`s-Sheet 3 INVENTOR flcHA RD /f HOHMA /v/v BY f l ATTCRNEY Patented Nov. 18, 1947 SEWING MACHINE Richard K. Hohmann, Jamaica, N. Y., assignor to Sears, Roebuck and Co., Chicago, Ill., a corporation of New York Application July 18, 1942, Serial No. 451,422

12 Claims. 1

The general object of the present invention is to provide a sewing machine of improved construction. More specifically, the invention has for a primary object, the incorporation in the hollow sewing machine head or frame of sewing machine parts or adjuncts which heretofore have customarily been external to the head or frame. One specific object of the invention is to provide a sewing machine with a simple and effective bobbin winding mechanism which is normally concealed in the sewing machine frame, but can be partially advanced out of the frame to facilitate the use of said mechanism. Another specie object of the invention is to provide bobbin winding mechanism improvements, which while adapted for mounting within the sewing machine frame are not restricted to such use.

Other specific objects of the invention are to provide a sewing machine with improved work illuminating means comprising an electric lamp mounted within an upper portion of the frame, and to provide an improved driving connection between a motor mounted in the base portion of the sewing machine frame and the needle bar actuating shaft mounted in the upper portion of the frame and including a driving belt within the hollow standard portion of the frame.

A-further object of the invention is to provide a sewing machine frame characterized by a greater accessibility to the interior of the entire upper portion of the frame than has been customary heretofore, this improved accessibility is of especial importance in a sewing machine frame which is adapted for use in the attainment of the previous mentioned objects of the invention, and which to that end, has its upper portion somewhat larger in horizontal cross section than is customary.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, however, its advantages, and specific objects attained with its use, reference should be had to the accompanying drawing and descriptive matter in which I have illustrated and described preferred embodiments of the invention.

Of the drawings:

Fig. 1 is a side elevation of a sewing machine head partly broken awayand in section;

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 3 is a partial section on the line 3--3 of Fig, 1;

Fig. 4 is a perspective view illustrating details of the drive mechanism;

Fig. 5 is a partial section on the line 5--5 of Fig. 1;

Fig. 6 is a side elevation of a portion of the mechanism shown in Fig. 5;

Fig. 7 is a side elevation of a portion of the frame partly broken and in section on the line l-'I of Fig. 9 to illustrate the mounting of a lamp within the arm portion of the frame;

Fig. 8 is a partial section on the line 8 8 of Fig. 7;

Fig. 9 is a section on the line 9-9 of Fig. 8; and

Fig. 10 is an elevation of the lamp and its supporting means and a modified form of refiector.

In the accompanying drawings I have illustrated the use of the improvements disclosed and claimed herein, in a convertible sewing and darning machine which is of the general character disclosed in Patent 2,247,379, granted July 1, 1941, on an application filed by Frederic Osann and me as joint inventors, and which is adapte-d for mounting in a drop head sewing machine cabinet, in the general manner disclosed in Patent No. 2,247,380, granted July 1, 1941, on my application. It is to be noted, however, that my said improvements are not restricted to use in sewing machines constructed and mounted as disclosed in said prior patents.

In the preferred form illustrated, the sewing machine frame comprises a main frame casting, which includes a pedestal portion A, a standard A1 extending up from the pedestal portion, an arm A2 extending horizontally away from the upper end of the standard and terminating at a distance from the latter in a needle head A3, and a cylinder arm A4 extending horizontally away from one side of the pedestal beneath the arm A2. Detachably secured to the pedestal portion of the `main frame casting is a base member A5 comprising a flat bottom portion, and an uprising rim portion displaced from the cylinder arm A4, .and comprising portions at opposite sides of the latter and a connecting end portion remote from the pedestal. A removable flat work bed part A6 may be supported by the cylinder arm A4 and the rim of the base member A5, to adapt the machine for ordinary flat sewing operations, or may be removed to facilitate sewing, darning and repairing operations on tubular work pulled over the free end of the cylinder arm A4.

The hollow standard A1 and horizontal arm A2 portions of the frame are relatively larger in transverse cross section than has been customary heretofore, and are adapted to house mechanism parts heretofore customarily mounted externally of the frame. The sewing machine frame shown in the drawing is also characterized by its formation with a top opening AFI which extends horizontally for substantially the full length and width of the arm A2 and across the upper end portion of the standard A1. The opening AFI is normally closed by a readily removable cover B, which is advantageously provided with a spring lever or other yielding retaining device Bl adapted to releasably secure the cover in place. The standard is also formed With an opening A8 in its front wall normally closed rby a door or cover member C which has an inwardly extending arm C1 pivote'd to the frame at A9. The opening A8 is provided to give access to, and to facilitate the use of a novel form of bobbin Winding mechanism devised .by me and hereinafter described.

The horizontal needle bar actuating shaft 1D which forms the main driving shaft of the sewing machine is mounted in the lower portion of the chamber space in the arm A2, and extends across the upper end of the chamber space in the standard A1. The under bed sewing machine mechanism comprisesa hook shaft E mounted in the ,cylinder arm A1 and carrying a rotary hook fit1 atrit's front end. A vertically disposed shaft F journalledin the standard A1 is gear connected atits ,endsto-thel shafts D and E and'thus forms means through which the driving shaft D rotates thehook shaft E. As shown, the sewing machine `includes a feed mechanism Vcomprising a pair of levers G extending upward through the standard A1 from about the-level of the shaft Ev, and operatively connected at their upper ends tothedriving shaft D. The saidfeed mechanism forms no lpart Vof the vpresent invention and may be, and as shown is, identical with that disclosed in `saidwprior Patent 2,247,379, and rneed not kbe further described herein.

Note, however, that the manually adjustable lever G1 which by its angular adjustment determines the direction of the work feed andthe length `of 'the stitches formed, extends 4through aslot formed for thepurpose in the central portion of the door C, and through a portion A of the 'frame casting which extends directly back of the cover C when the latter is in its closed position.

The driving shaft D is rotated in normal operation by Yan electric motor -H mounted in the pedestal portion of the frame and connected to the shaft D by a belt H1. The belt H1 extends about a driving pulley H2 Aon-tlie shaft of the motor H and about a pulley H3 surrounding and adapted to vbe releasably clutched to the driving shaft D as herein-after described. A guide pulley or Yidler 'H4 adjustably mounted inthe standard A1 engages the belt and keeps it taut. The pulleys vH3 and .H4 and belt H1 vare located Within the space surrounded by the unitary, standard forming, portion of the main .frame casting, which is formed with an opening A11 through which the idler H1 rmay be adjusted and through which the lbelt H1 may be manipulated in belt replacing operations. The opening A11 Ais normally closed by a removablecover parta.

As collectively shown in Figs. l, 2 and 3, the pulley H3 surrounds an elongated hub portion I1 of the hand wheel I, and is normally secured to said hub portion by set screws I2. The body portion of the Ahand wheel Iis external t'o the frame, and its elongated .hub I1 extends loosely lthrough an opening A12 formed in the side-.of thestandard and substantially Iconcealed and closed by the hand kwheel I. The -pulley `H3 and hand Wheel I are releasably clamped vto the driving shaft D for sewing operations, 4or `are freed to rotate about vthe :then stationary shaft D in .bobbin winding operations, by angular adjustments, relative to the shaft D, of a clamping nut J screwed on the threaded innerend of the shaft D. When the `nut J is rotated in the clamping direction relative Ato the shaft D, the hub I.1 is .clampedbetween an outwardly extending flange-portion of a member K surrounding the shaft D and rigidly secured thereto by set screws and a washer L which is interposed between thehea'd of the clamping screw J and the outer side of the hand wheel I. .The outer portion of the bore of the nut J is enlarged to receive the head d of a screw threaded intothe end of the shaft D. The screw head d is larger in diameter than the shaft D and is provided toprevent the4 nut from being inadvertently screwed off the shaft D.

To provide a suitably long bearing for the pulrley H3 and hand wheel I, and to permit their movement4 to the right, as seen in Fig. 1, to facilitate replacement of the driving belt H1, I make luse of a bearing sleeve M which surrounds both the elongated'hub portion K1 of the member K and the aligned tubular body of the clamping nut J. Longitudinal slots M1 formed in the inner end of the member M receives spline ribs 'K2 carried by the hub portion K1. As shown, the memberM is also formed at the outer end With'longitudinal slots M2 which receivelateral projections L1 from the washer L. The outer surfacesof-'the parts 'L1form extensions of the cylindrical outer surface of the member M and elongate'the bearing surface from the hub I1 when theclamping screw J is backed off and the parts I and H3 are moved relative to the shaft D into their dotted line positions shown in Fig. 3. Such displacement of the pulley H3 facilitates belt manipulations of the belt, in thecourse of belt replacement effected through the frame opening A12. The member M also provides a spline connection between the clamping washer L and the part K and shaft D which facilitate the clamping of the pulleyH3 to said shaft.

At its inner side, the ,pulley H3 is provided with a cylindrical flange H1 which during the'bobbin winding operation serves as a driving roll engaged 4by and rotating a friction Wheel N. The latter is secured on one end of a bobbin winding spindle or shaft N1 which has its opposite end bifurcated to enter the central passage of a bobbin n 4and frictionally secure the latter to said spindle. The spindle N1 is journalled in a bearing block N3 carried by the upper end of an arm O which has its lower end journalled on a pivot O1, which has a threaded extension O2 anchored in a supporting ,member P. The latter is vertically disposed in Vthe standard A1 and adjacent its lower end is pivcted on a pivot pin P1 having a threaded extension anchored in a frame casting lug or projection A13. The shaft N1, and pivot pins O1 and P1 are all parallel to the driving shaft D.

A spring P3 subjects the member P to a bias force tending to turn the member in the counterclockwise direction as seen in Fig. 5 and thus maintain the friction wheel N in operative engagement with driving pulley flange H4. However, such engagement can be effected only when the cover C is in its open position, .since as the cover moves into its closed position it engages a projection P1 of the member P and turns the latter into a position in which the friction wheel N is held out of engagement with the yflange H1.

A spring O3 coiled about a hub portion of the arm O and having its opposite ends in operative engagement with said arm and the frame P, respectively, provides a bias force tending to move the arm O clockwise into the dotted line position shown in Fig. 5. Normally, however, the arm O is held in its full line position within the standard A1 by a latch member Q pivoted to the support P and having a hook Q1, which normally engages a latch pin Of4 secured to the arm O. The latch Q is biased by a spring Q2 into locking engagement with the pin O4', and is provided with an extension arm Q3 through which the latch Q may be adjusted clockwise, as seen in Fig. 5, about its pivot P1 to release the pin O4 and permit the member O to turn into its dotted line position shown in Fig. 5.

The latch member Q with its projection Q3 may be manually engaged through the opening A8 to release the member 'O and permit the latter to move out through the opening A8 into its dotted line position, in which the spindle N1 is conveniently disposed for mounting a bobbin on, and removing-a bobbin from said spindle The latch member Q with its projection Q2 also forms a means for automatically interrupting the bobbin winding operation when the proper amount of thread is wound on the bobbin. This action results from the fact that as the bobbin becomes lled with thread, the thread mass engages and deects the arm Q3 and thus moves the latch Q out of operative engagement with the pin O4.

The cover member C is yieldingly held either in its open position shown in Fig. 5, or in its closed position shown in Fig. 2, by means of a spring connection between the door and the sewing machine frame. The connection shown comprises a helical compression spring C5 surrounding a guide rod C'3 which has one end connected by a pivot pin C7 to the door bracket C1 and which has its opposite end portion extending through a passage formed in a spring abutment member C8, The member C8 is supported by a pivot pin A11 carried by the frame casting and parallel to the cover supporting pivot A9. The spring C5 acts between the abutment member C8 and an abutment shoulder on the guide rod C6 adjacent the pivot C1. The pivots C7, A9 and A11 are so relatively disposed that the line of action 1 wide open position shown in Fig. 5, and to op- .l

pose movement of the cover C out of its fully closed position shown in Fig. 2. The cover closing force exerted on the cover C when the latter is in its closed position, should be somewhat in excess of the opening force then impressed on f the cover C by the bias spring P3, which acts on the cover through the projection P1 of the member P.

The cover part C is provided at its inner side with an attachment R which comprises a spool spindle R1 for supporting a spool from which thread is wound on a bobbin, as shown in Fig. 5. The attachment R includes tension discs R2, and is formed with a thread guide passage R3 from the supply spool on the spindle R1. The thread passes to the .bobbin n on which it is beingwound from the tension device R2, and the latter maintains the thread properly taut during the bobbin winding operation.

The fact that the standard and upper overhanging arm portions of the sewing machine are larger in horizontal cross section than is customary, coupled with the free access to the interior of the arm and standard provided by the large opening A7 and removable cover B, not only facilitates the described disposition of the bobbin winding mechanism within the standard A1, but also makes it readily feasible to locate a work illuminating electric lamp S within the arm A2.

As shown in Figs. 1 and 7, the lamp S is mounted in a ysocket S1 normally so disposed that the lamp may suitably illuminate the work on which the machine is operating through an opening A15 in the bottom wall portion of the arm A2. In the particular arrangement shown, the lamp socket S1 is clamped in a bracket S2, supported by a pivot S3, carried by a. sheet metal part S4 which is secured by a screw S6, to a lug or projection portion A16 of the arm A2. The bracket S1 includes a portion S5 which forms a cradle like support for the lamp socket S1 when the latter is in its normal position. The lamp socket bracket S2 may be turned about the pivot S3 to move the lamp and lamp socket from their normal positions shown in full lines, into their positions shown in dotted lines in Fig. 7. In its dotted line position the lamp S is convenienth7 disposed for insertion in and removal from the socket S1, As shown, the lamp and socket have bayonet joint connecting provisions as is customary for small sewing machine lamps. Light radiated horizontally and upwardly from the lamp S, is reflected through the opening A15 by a reflector T which may be formed of enamelled sheet metal. The reiiector T may have its 0pposite edges releasably snapped into engagement with frame locking shoulders A17 and A18 as shown in Figs. 8 and 9. Alternatively, a reflector TA may be secured to the lamp socket. or to the socket supporting bracket S2 as shown in Fig l0. A switch SFI controlling the energization of the lamp S is mounted on the arm A2.

As shown, a spool spindle U normally extends upward from the top cover B as shown in Fig. 1 to support the thread spool which supplies thread to the sewing machine needle. Advantageously, the spindle U is connected to the cover B so that it may be readily detached, or displaced from its normal operating position, so as to reduce the required bulk of a suitable shipping container in which the sewing machine may be packed for transportation. The detachment or displacement of the spindle U also substantially `eliminates risk of spindle injury while the sewing machine is in transit and while it is being moved into and out of the shipping container in which it is transported. In the particular construction shown, the spindle U is normally mounted in a vertical passage extending through the cover B and an integral boss B5 at the underside of the cover, A spring pressed ball U1 mounted in the boss B5 forms a locking detent adapted to enter a groove U2 in the spindle U and hold the latter in its operative position shown in Fig. 1, and also adapted to engage a shoulder U3 at the upper end of the spindle U, and hold the latter in a retracted position as shown in Fig. 9. The spindle U may be readily moved between its Fig. 1 and Fig. 9 positions, and, when desired, may easily be moved down out of and be readily reentered in the cover passage in which it is received as shown in Fig. 1 and Fig. 9.

As will be readily apparent to those skilled in the art, my improved sewing machine `possesses practically important structural and operating advantages, some of which have already been mentioned. The location of the lamp S and the bobbin winding Ymechanism Within the hollow frame not only simplifies the external form and improves the appearance of the frame, but substantially eliminates risk of contacts with the llamp and bobbin winding mechanism which may result in injury to them, or to the operator, or to the work.

The unusually free and extended access to the interior of the arm A2 and standard A1, resulting from the disposition and large size of the opening A7, is especially advantageous because the arm A2 and standard A1 are unusually large in horizontal cross section and house the lamp S and bobbin winding mechanism, and also because it facilitates the inspection, adjustment and repairs of the sewing mechanism parts customarily mounted in the upper portion of the frame. Furthermore, the disposition and size of the opening A"I makes it practically feasible to provide effective lubricating provisions made accessible by the removal of the cover B for practically all of the sewing machine bearings requiring lubrication, except those located in the cylinder arm A4 adjacent its free end. The resultant elimination of oiling holes extending into the frame from its outer surface, not only improves the appearance of the sewing machine but eliminates trouble due to the accumulation of oil and dirt on the surface of the machine, and also facilitates the use of simpler and more effective lubricating provisions.

The separable hand wheel I and driving pulley H3 are formed and associated with the drive ing shaft D, in a practically simple and effective manner and are characterized by the relative ease with which they may be assembled and disassembled. The detachable mounting of the pulley H3 on thel hub of the hand wheel I, and the provisions made for disconnecting them from the drive shaft D, make it possible to locate the hand wheel outside, and the pulley within the frame, while permitting the frame opening A12 through which they 'are connected, to be substantially smaller in diameter than either the pulley or the hand wheel.

To separate the hand wheel I from the pulley H3 and shaft D preparatory to their removal from the frame, it is necessary only to loosen the set screws I2, remove the screw d, and screw the clamping nut member J off of the shaft D. The hand wheel I and bearing sleeve member M may then be removed from the machine, and thereafter the driving shaft D may be displaced in its bearings, to the left as seen in Fig, l, far enough to clear the pulley H3, and the latter may then be moved upwardly out of the arm A2 through the opening A7. 'Ihe assembly of the above mentioned parts may be effected by operations the reverse of those just mentioned. The novel arrangement of the hand wheel I, pulley H3 and driving shaft D disclosed but not claimed herein, is disclosed and claimed in my application Serial No. 739,436, filed April 4, 1947, as a division of this application.

The bobbin winding mechanism is mechanically simple and reliable, and the bobbin winding operation may be effected quickly and easily. Preparatory to that operation the cover C is moved fro-m its closed to its open position, and the latch member Q is turned to release the locking pin O1 and permit the arm O to swing into its dotted line position shown in Fig. 5. With the cover C in its open position, the latch projection Q3 may be actuated to release the locking pin O1 by the linger of the operator extended into the standard through the upper portion of the opening A8.

With the member O in its position shown in dotted lines in Fig. 5, the spindle end N2 is conveniently disposed for the placement thereon of a bobbin n to be filled with thread, and for the connection to the bobbin of the thread to be wound in the bobbin. That thread is drawn through the guide opening R3 and tension discs R2 of the attachment R which supports the spindle R1 on which the bobbin thread supply spool is ordinarily placed after the cover C is moved into its open position. The member O may then be returned to and latched in its normal position, and in which the driving motor may then be started into operation to rotate the spindle N1. Normally and desirably, however, the clamping nut J is backed off to operatively disconnect the pulley A3 from the driving shaft D before the motor is energized and begins to rotate the bobbin spindle through the pulley flange H4 and wheel N.

In the preferred construction shown, the projection Q3 is so shaped and disposed that when the desired amount of thread has been wound on the bobbin, the external diameter of the annular thread body on the bobbin will be sufficient to move the projection Q to the leftI as seen in Fig. 5 far enough to lift the hook Q1 above the locking pin O4 and thereby automatically return the arm O to its dotted line position. The resultant movement of the friction wheel N away from the driving ange H4 terminates the bobbin winding operation and the filled bobbin is then in a position for easy removal from the spindle end.

After the removal of the bobbin thread filled and the relatching of the arm O to the member, and the removal of the bobbin thread spool from the spindle R1 and the movement of the cover C into its normal closed position, the machine is restored to its normal condition for stitch forming operations. As the cover C moves into its closed position, it engages the projection P1 and thereby gives the member P the clockwise adjustment, as seen in Fig. 5, needed to move the friction wheel N out of engagement with the periphery of the flange H4.

While in accordance with the provisions of the statutes, I have illustrated and described the best forms of embodiment of my invention now known to me, it will be apparent to those skilled in the art that changes may be made in the forms of the apparatus disclosed without departing from the spirit of my invention, as set forth in the appended claims and that in some cases certain features of my invention may be used to advantage without a corresponding use of other features.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a sewing machine, the combination with a sewing machine frame including a hollow standard with an opening in its wall, of a bobbin winding spindle, supporting means therefor normally within said frame and adjustable to move said spindle through said opening between one position in which said spindle is within said standard and a second position in which said spindle is external to said standard.

2. In a sewing machine, the combination with a sewing machine frame including a hollow standard with an opening in its wall, of a bobbin winding spindle, supporting means therefor normally within said frame and adjustable to move said spindle through said opening between an operative position within said standard and a second position external to said standard, and means for rotating said spindle while the latter is in said operative position.

3. In a sewing machine, the combination with a frame having a hollow standard portion with an opening in its wall, of sewing mechanism including a horizontal shaft mounted in said frame and extending into theupper portion of said hollow standard, a bobbin winding spindle, a supporting arm at one end of which said spindle is mounted, a connection within said frame between the other end of said arm and said frame permitting movement of said arm relative to said frame to move said spindle through said opening from a position in which the latter is within said standardA and is operativelyconnected to said shaft and a second position in which said spindle shaft is external to said standard and is operatively disconnected from said shaft.

4. A sewing machine as specified in claim 3, comprising a cover mounted on said frame for movement into and out of a normal position in which it closes said opening and acting on said connection as it moves into said normal position to operatively disconnect the bobbin winding spindle from said horizontal shaft.

5. A sewing machine as speciiied in claim 3 comprising means responsive to the quantity of thread on a bobbin `being wound for eiecting movementI of said spindle into said second position when a predetermined amount of thread is wound on said bobbin.V

6. In a sewing machine; the combination with a frame comprising a hollow standard with an opening in its wall, of a rotatable shaft mounted in said frame and extending into the upper portion of said hollow standard, a bobbin winding spindle, supporting means for said spindle comprising a member mounted in said hollow standard for movement relative thereto, a connection between said member and spindle adjustable to move the spindle through said opening between an operative position within said standard and in fixed relation to said member, and a bobbin placement position external to said standard, latching means releasably maintaining said xed relation, said member being biased for movement in a direction to establish a driving connection between said shaft and spindle when the latter is maintained in said fixed relation to said member and a cover mounted on said frame for movement into and out of a position in which it closes said opening and which actuates said member to interrupt said driving engagement as it moves into its closed position.

7. In a sewing machine, the combination with a frame comprising a hollow standard with an opening in its wall, of a rotatable shaft mounted in said frame and extending into the upper portion of said hollow standard, a bobbin winding spindle, supporting means for said spindle comprising a member mounted in said hollow standard for movement relative thereto, and a connection between said member and spindle adjustable to move the spindle through said opening between an operative position within said standard and in fixed relation to said member and a bobbin placement position external to said standard and biased to move said spindle into said bob-bin placement position, latching means releasably maintaining said xed relation, said member being biased for movement in a direction to establish Va driving connection between said shaft and spindle when the latter is releasably connected to said member, and a cover mounted on said frame for movement into and out of a position in which it closes said opening and acting on said member to interrupt said driving engagement as it moves into its closed position, and means responsive to the quantity 10 of thread on a bobbin being wound for releasing said latching means and terminating the bobbin winding operation when said quantity attains a predetermined value.

8. In a sewing machine, the combination with a frame comprising a hollow standard with an opening in its wall, of a rotatable shaft mounted in said frame and extending into the upper portion o said hollow standard, a bobbin winding spindle, a supporting connection between said i'rame and spindle adjustable to move the spindle through said opening between an operative position within said standard, and a .bobbin placement position external to said standard and biased to move said spindle into said bobbin placement position, latching means releasably maintaining said spindle in its operative position, means establishing a driving connection between said shaft and spindle when the latter is maintained in said operative position, and means responsive to the quantity of thread on a bobbin being wound `for releasing said latching means and thereby terminating the bobbin winding operation when said quantity attains a predetermined value.

9. In a sewing machine, a frame comprising an uprising standard arm and a hollow overhanging arm formed with alower wall opening and with an upper wall opening, and having one end connected to the upper end of said standard and a needle head connected to the other end of said arm, work supporting means beneath said needle head, mechanism mounted in said needle head for actuating a needle operating on work supported by said means, an operating shaft for said mechanism horizontally disposed in said hollow arm for rotation about its own axis, a lamp, a lamp socket supporting said lamp and pivotally mounted in said arm to turn between one position in which the lamp is adjacent the underside of the arm and is adapted to transmit light through said lower opening to illuminate said work, and a second position in which said lamp is accessible for replacement in said socket through said upper wall opening, said lamp and socket being horizontally displaced from the aXiS of said shaft.

l0. A domestic sewing machine including in combination, a frame comprising a hollow standard open at its upper end and a hollow horizontal arm conneoted'at one end to the upper end of said standard and supported by the latter and open at its upper side and formed with an opening in its under side, mechanism mounted in said hollow standard and arm and including an operating shaft horizontally disposed in said hollow arm for rotation about its own axis, cover means normally supported by said frame and closing the open upper end of said standard and the open upper side of said arm and removable to provide access to said mechanism, and a lamp mounted in said arm adjacent the said opening in the underside of the arm and accessible for replacement through the open upper side of said arm and transmitting light through said under side opening, said lamp and socketbeing horizontally displaced from the axis of said shaft.

11. A domestic sewing machine including in combination, a frame comprising a hollow standard open at its upper end and a hollow horizontal arm connected at one end to the upper end of said standard and supported by the latter and open at its upper side for substantially the full horizontal cross section of said arm, mechanism mounted in said hollow standard and arm, cover means normally supported by said frame and closing the open upper end of said standard and the open upper side of said arm and removable to provide access to said mechanism, anda bobbin winding mechanism mounted in said standard and forming a portion of the mechanism to which access is provided when said cover means are removed. n

12. In a sewing machine, the combination with a frame having a hollow standard portion with an opening in its wall, of sewing mechanism including a horizontal shaft mounted insaid frame to extend through the upper portion of said hollow arm, a driving element mounted on said shaft, a bobbin winding spindle, a supporting arm at one end of which said spindle is mounted, a connection within said frame between the other end of said arm and said frame permitting movement of said arm relative to said frame to move said spindle through said opening from a position in which the spindle is within said standard and is operatively coupled to said driving element, and a second position in which said spindle shaft is eX- ternal to said standard and is operatively uncoupled from said element, and a clutch means including a portion within said standard and a portion external to said standard for adjustment to secure said elementto said shaft or to release said element and permitrotation of said bobbin winding spindle without rotation of said shaft.

RICHARD K. HOHMANN.

REFERENCES CITED The following references are of record in the file of this patent:

5 UNITED STATES PATENTS Number Name Date 2,247,379 Hohmann et al July 1, 1941 2,001,966 List May 21, 1935 lo 1,773,075 Christensen et al. Aug. 12, 1930 1,934,259 Clayton Nov. 7, 1933 2,056,829 Colegrove et al Oct. 6, 1936 202,312 Warner Apr. 9, 1878 1,783,544 Packer Dec. 2, 1930 15 1,151,877 Hemleb Aug. 31, 1915 2,220,969 List et al Nov. 12, 1940 516,214 Mohr et al Mar. 13, 1894 1,362,791 Hayes et al Dec. 21, 1920 1,362,792 Hayes Dec. 21, 1920 1,472,098 Sweetland Oct. 30, 1923 20 1,741,096 Christensen et al. Dec. 24, 1929 1,504,950 Greenwood Aug. 12, 1924 1,000,577 Blair Aug. 15, 1911 FOREIGN PATENTS 25 Number Country Date 445,594 Germany June 15, 1927 38,669 France Mar. 24, 1931 (First Addition to No. 689,034)