US2378534A - Sewing machine - Google Patents

Description

June`19, 1945. W K R BIE-YER v 2,378,534

k sEwINq MACHINE Filed Dec. 12, 1941 24 I 27 ,i l

' Fzzg. F 23 Inventor: WKIRBeygr I by his Affe/neg PatentedA June 19, 1945 UNITED STATE s PATENT OFFICE SEWING MACHINE Werner Kurt Rudolf Beyer, Dresden, Germany;

vested in the Alien Property Custodian Application December 12, 1941, Serial No. 422,672

` 3 claims. (C1. i12-158) The present invention refers to household sew'- ing machines and more especially to zig-Zag-sewing machines.

The Width of the stitches in zig-'zag-sewlng ma- Ywhich is movably adjusted there to conform to a scale ofthe several widths of the stitches.

In order not to have to hunt after each individual change` of the widths of the stitches for an adjustment which is used repeatedly, setscrews have been used for the purpose lof limiting the extent of the moti-on of the stop-peg. Such a limitation however fixes two widths of the stitch only. For instance: one setscrew serving as stop kfor the movement of the slide can be adjusted y solthat the slide comes to stop at le inch, while the second setscrew servingas stop can be ad- Ajusted so that ,the slide comes to stop at the point 0f its inch on the scale. These two Widthsof stitches xed by the setscrewscan be found during the operation of the machine without glancing at the scale. If however other Widths of the stitches are desired thanthe ones which are established by the setscrews and which lie between and Within the kwidths of the stitches as established by the setscrews, then it is necessary to find the new place on the scale for the position ofthe stop-peg. If however widths of the stitches are desired which are beyond the limits of the widths of the stitches as established by the setscrews, that is: widths which lie either above or below the set limits of the setscrews, then it is necessary to screw the setscrews back so that the desired adjustment on the scale can be made. For many performancesof the machine it is necessary to be able to have adjusted more than only two widths of stitches in constant change with one another and this fact developed the necessity to be able to linstall additional, adjustbe brought out of the active and effective position into an inactive'and ineiTectiVe position so that also thereby the realm of the mutual inlluence is destroyed by the change of position relative to each other, i. e., of stop-peg and setscrews. 4 In 'order to carry out .this solution in actual practice the stop-peg is provided in this wellknown device with an adjustable slide which, when in active use, is stopped by the setscrews, and which however can be moved from the realm of activity of the setscrews in order to make possible a complete freedom of ymotion for the stoppeg along the entire scale.

This device however cannot be serviced easily in every position of adjustment. When for instance the stop-peg has been removed from the realm of inuence 4of the setscrews and shall then y again be brought back to its position as before the removal, then it "is necessary to move the stop-peg rst again in a position which enables it to reestablish the mutual influence between the adjustable slide of the stop-peg and setscrews.

This position must be hunted up or at least it vmust be felt for by repeated trying. A complete mechanical act, a blind finding is not possible.

To explain more fully the action of this wellknown device according to the above described example: In order to bring the slide back again within the realm of the setscrews it is necessary to bring the stop-peg first into a position which makes it possible that the slide can be pushed again between the setscrews. If the stop-peg is not as yet in that particular position, then the slide will strikel against the setscrews and can therefore not slide between the setscrews.

. This present invention presents a further solution of the wellknown problem to effect more than two adjustments of the stop-peg on the scale without having 'to touch the adjusted setscrews;

an act whereby the scope of mutual iniluence'between stop-peg and setscrews is not changed by thechange of the relative position. This is effeoted through the fact that an additional adjustment of the width of the zig-zag-stitches is obtained besides the one which Was obtained by the change of position of the stop-peg between ments without changing the previously fixed poy sition of the setscrews.

Awell known solution ofy this task proposes to move the vstop-peg beyond the reach of the setscrews. By a change of the stop-peg relative to the setscrews the stop-peg must be temporarily removed from the realm of mutual activity of the setscrews or from within the limits of the setscrews, or onv the other hand the set-screws must the limits established by the setscrews. This additional adjustment is obtained by means of an interiorstructure of an adjustment device added to the set of connecting rods between the stoppeg and the slide.

` For'the purpose of the easiest and most simple servicing of this device it is of advantage that the additional adjustment device, which is efftected through an interior structure, can be adjusted likewise by means of the stop-peg which is movable within the limits of the setscrews.

A practical arrangement of this invention is marked by the fact that the set of connecting rods, found between the stop-peg and the slide, consist of a rod connected with the movable part of the slide andof a crank connected with the stop-peg, which rod and crank are movably connected with each other and which when held in rigidly extended position influence the movable ying motion which the bolt 9 execute-s between part of the slide by moving the stop-peg between the adjusted limits, established by the setscrews, and which however by turning the stop-peg will be brought into a rigidly extended position and thereby cause an additionalmotion of the movable part of the slide.

The stretched, rigidly extended position of the connecting rod and crank can be secured by an endstop mounted on the stop-peg which endstop limits the turning of the stop-peg.

The drawing will illustrate the object of the invention by means of a .practical example. In the drawing v Fig. 1 isan end view partly in transverse section of the head of a sewing machine with the device according to the invention with crank and connecting rod lying in stretched, rigidly extended position,

Figs. 2, and 4 showdiagrammatic'ally three separate positions of `the Aadjusting means,

Fig. 5 is a perspective view of :the essential-part in the head of "a sewing 'machine showing among others the interior structure according to the invention,

Fig. 6 illustrates an ornamental stitching and Fig. 7 the stitching for a completed button hole.

In the arrn of the "sewing machine is the malnsha'ft "I which reaches in a well-known way into the 'head 2 of the'sewing machine and on which is mounted the 'means necessary for the transfer of the 'rotary motion to the mechanism built in the head. The motion necessary for swinging the'rieedleb'ar to and fro is transmitted in `the practical example by 'two spiral gears `3 and l the latter being u'pon the 'cylinder 5 'which 4'revolves around the (shaft .which is situated in the 'interior of the vmachine head. Upon the cylinder '5'is la cam IS Iwhich is surrounded by 'a fork 1.4 This fork 1 is vswin'gably mounted upon abolt '8 vwhich is situated'in the wall of the 'macliiie. From a lateral'projection la of the 'fork 1 abolt 9 extends within a fork I0 which is 'mounted on an arm I'I of 'the 'well-'known movable needlebar guide. AUp'o'n the 'bolt '9 'is a cylindrical slide I'2 which'ext'ends between the ends of the fork III.V This 'slide 'I2 is movably connected with a rod 'I3 which 'in turn is movably connected with a crank Ii-'L This crank Ill is fastened rigidly to a bolt I5 which vextends through the shouldered'stop-'pe'g Hil and which carries at its front end a knob I1. A loose collar I1 is urged by coilsprin'gI-'I" toward the` shouldered end. The'stoppeg I6 is movable and frictionally held in placel on 'a scale I8 fastened to the front wall of the niachine'and thisup and down motion is limited by two setscrews I9 "and 2U. A small projection 2'I 'atthe'knob 'I1 ofthe bolt I5 which drops into a notch 22 of the stop-peg 'I6 enables the turning of the bolt I5 'to stop, when th'e connecting rod I3'a`n`d the crank I4 are situated in rigidly extended position. The operation of the device is the following: As mentioned above the 'motion of the main Ashaft I situated in the sewing machine rhead'is transmitted by means of -thetwo spiral gears 3 and l tothe ucylinder 5 situated in the ends of Ithe second fork I fastened to the needlebar guide Il. By means of the slide I2 which is mounted movably upon the bolt 9 situated upon the lateral projection 'M of the fork 1 the swinging motion of the bolt Q is transmitted to the second fork IE! mounted on the arm II of the needlebar guide from whence this motion is transmitted in its turn to `the movable needlebar housed in the head of the machine.

This transfer "of rocking motion of the bolt 9 situated in the rst fork 1 to the needlebar is eifected only when the axis of the slide I2 stands laterally of the axis of the bolt 8 of this first turnable lfork 1, In this coaxial position the cylindrical slide I2 undergoes a turning motion,

but only around 'its own axis, hence it does not effect 'the second fork IB on the arm II`I of the needlebar guide. If however the slide I2 is pushed out of this coaxial position fur-ther toward the free 'end of the bolt 9 which is situated between 'the prongs of the second fork IIB, then the slide transmits the swinging motion of 'the bolt 9 in greater measure upon the second fork 'I0 and thereby upon the arm il 'of the needlebar guide as the slide is pushed away'from the axis of the rst fork.

This y"shiftir'ig is accomplished by the stop-'peg I6 situated 'on the front of the kfrnachirfe head. The connection to the stop-'peg 'I6 'is effected by means of the connecting rod 'I3 rnovably'in'ounted on the slide I2 and by 'means of 'the crank I4 situated on the bolt I5 'whichv'is 'inside the stoppeg I'I. When these connecting links 4I3 and 'Ill are in a rigidly'extended'position 'and when these connecting links are secured in this rigid position, then it 'establishes as it werea firm connection between slide I2 and bolt I5 `inside the stoppeg I6. The stop-peg I6 is 'moved on 'the scale `I8 indicating vthe widths of stitches to the desired width and this 4shifting lis transferred immediately upon the slide when the connecting rod I3 and crank I4 are in 'rigidly Aextended position. The limitation of the shiftingof the stop-peg I6 on the scale "i3 `is done by means'of the setscrews I9 and 2l) situated at the fron-t wall ofthe head of the machine. `Referring `to the example of operation mentioned in Zthe introduction, the lower setscrew 20 can be adjusted 'so 'that the stop-peg touches against the setsc're'w at T3; inch of width of stitch and the `upper setscrew I9 can be adjusted so that the stop-peg touches 'the sets'crew at 1-6- inch-of width of stitch. In such an adjustment the width of vstitches can :be changed blindly that is by touch only 'between -Ts'and 11s inch, a fact which has been known for along time.

yIf it is desired to work witha rwidth of stitches narrower than the one'adjusted by the setscrew I9 `then'this visjrdo'n'evby 'turning the `knob of the stop-peg I6. This knob I1., which 'forms one unitv with the bolt I5 situated in the interior of c the stop-peg ls andwiththe crank im 'fastened to this bolt I5, during its turingmotion swings the crank I4 and draws along thereby the rod I3 'movably connected therewith, which rod Ylf3 in turn is connected 'with the slide LI2. According'to'the amount of the turning` of Ithe knob I1 the Yslide I?. -situated upon the bolt 9 moves upward (see Figi-1). Thus the distance of the to That is the `samevposition from which the startv and fro 'swingingmotionof the needle is lessened. It is-therefore possiblento leave thestop-pegfin its positiomthat is: touching vthe lowersetscrew ZILand itisnecessaryionly to turn the knob 'I1 in ordery to diminish thedistanceof the to and fro swinging motion of the-needle. By, correspondinglyA turning backtheknob I1 up to the, rigidly extended position of .the connecting links, a motion limited by; touching the notch A22 and -the smallv .projection 2|'.fof the .revolvingy knob Y I1, the-,original position shown injFig.. 1 is instantly reestablished. 'I'he turning of the knob I1v can beA done in'any position at vall of the stop-peg` I6.

In Fig. zlthe'stop-peg I6 isintouchwith the upper setscrew I9. Thiscorresponds with.Fig;,3.'

In Fig. 4 however is shown a position of the slide I2 which is reached `by ,turning the knob I1.

` stop-pegIB out of therealm of iniluence limited by the setscrews@v j f A change between a maximum size, a medium size and the adjustmentfzero offithewidth of the stitches is often used in sewing, be it for the purpose of doing special zig-zag ornamental sewing which changes continuously between a and plain stitches as is demonstrated in Fig. 6, or be it for the working of button holes, as is shownin Fig. '7. In the zig-zag stitch for vornamental sewing Aas is shown in Fig. 6 the adjustment of Lthe width of the zigzag-stitch has for vinstance the following always recurring sizes:

etc. Therefore the setscrews are adjusted so that the lower setscrew 20 stops the stop-peg at ,Je of an inch and the upper setscrew vI9 stops the stop-peg at. 11g inch. In order to make such a seam one begins the sewing with anadjustment of the stop-peg in the lowest position of contact,

that is, in the lposition where the stop-'peg touches the lower setscrew 20. lAfter finishing the Tag inch wide zigzag-stitches the knob I1 is turned until one feels the touch of the small projection 2| against `the notch 22. Since `the slide I2 stands now in a coaxial positionvwith the axis l of the flrst fork 1, the needlebar'makes no to or .fro motion, in other words, it sews plain stitches.

After finishing these plain Vstitches the knob I1 is turned in the oppositeA direction back to itsv limit, which can be felt, thus establishing the rigidly extended position of the connecting links and then the stop-peg is shifted against the upper setscrew I9 and comes there to rest. Now

the .needlebar swings to and fro a distance of inch. Afterinishing these 13e inch wide zigzag-stitches the knob II is' turned again so far that one feels the touching of the limit 'as described above, which again corresponds to the coaxial position of the slide I2 with the axis of the ilrst fork 1, that is, until it sews Without to and fro motion of the needlebar'a seam sewn in zero that is: plain stitches.y rIf it is now desired to sew'again a inch wide zig-zag stitch one l Here the slide I2 is in 'its coaxial position with y yzig-zag seam of tWo different widths of stitches has'been made inthe example here cited. This is repeated during the further sewing. The sewingdof a buttonhole according to Fig. 7 can be done inthe following manner: one begins to sew the edge 23 of the one side of the buttonhole from a point I with an adjustment of s inch width ofstitches,.that is, the stop-peg is in touch with the upper lset-screw I9 and the connectingl links between .stop-peg and slide are in rigidly extended position. This edgeis finished to point II, then one moves the stop-peg down tothe lower setscrew 20 retaining the rigidlyextended position of kthe connecting rods, and the one end 24 0f the'buttonhole issewed with a width of Tag inchstitching; after finishing this end 24 one moves thestop-pegagainst the upper setscrew I9:

again by maintaining the rigidly extended positionfof the connecting links. The second edge 25 of the other side of the buttonhole is then seWed with .a .le inch wide zig-zag stitch from III-JV. After nishing this edge the stop-peg is `again .moved until it touches the lower setscrew 20 again retaining the rigidly extended position of the-connecting links, and now the other end 26 of 4the buttonhole is closed with stitches ige inch wide. After finishing this end 26 one turns the knob I1 so far that one feels its boundarylimit, that is, until-a coaxial position has been established between the slide I2 and the axis of the bolt 8 of the first fork 1, and now, the thread is made fast by plain stitch 21. When the next buttonhole is to be started one turns back the knob I1 again until the rigidly extended position of the connecting links has been established and the stop-peg is pushed against the upper setscrew I 9. In Figs. 2 to 4 Adiagrams of the adjustments which take place in the interior of the head during the execution of these two sewing examples are againfrepresented. Fig. 2 corresponds to the adjustment of the stop-peg, when the stop-peg touches the lower set-screw 20. The width of the stitches here, is for instance, 13 inch.l l'lromthis position the stop-peg ispushed upward for the distance x so that it touches the upper setscrew I9 retaining thereby always the rigidly extended position turns back the knob I1 so far that one feels the limit of the rigidly extended position of the connecting links, and shifts at the same time the stop-peg again against the lower set screw 20.

of the connecting links. This is shown in Fig. 3. Now the width of the stitch is to be inch. By turning the knob II the crank I4 connected with the bolt I5 and knob I1 is swungat an angle a. This corresponds to the to and fro motion of the needlebar zero therefore plain stitches are sewed. The above described examples of sewing can be executed completely blind, that is by touch only, because each and every'position used in them is limited by stops which can be felt. When besides these limits, which can be felt, other limits of widths of stitches are to be installed, they can be installed by means of a small indicator-not shown in thev drawing, which is ymounted upon the knob I1 andwhich works according to a scale not shown in this drawing on the stop-peg I6. It is necessary to observe that the desired width of the stitches is the difference between the width of the stitch indicated on the main scale I8 and the width of the stitch indicated on the scale on the stop peg. A third adjustablestop besides the two already present in the shape of the setscrews can be mounted in the stop-peg I6, against which stop the above mentioned indicator or some other pr jection of the knob I1 strikes and limits thereby the turning of the knob I'1.l Ihis arrangement is of special advantage when it is not desired to fall back upon plaink stitches corresponding to the zero position, bult when the` Width of` the stitch is to be greater than zero.

ItV must be'. understoodthat in the drawing only those parts of the construction are.l desig-y hated by number which are essential to clarify my invention.

In. this description I have explained onlyA one practicalv construction of the device, but itL must be understood that my invention may be embodied in other forms and on other sewing ma shines.

I claim:

1. In the head of a zigzag sewing machine, a vibratory needle guide provided witha guide way, a member oscillatable about' a pivot normal to the guide way, a slide member disposed in"` said guide way and carried by sai-d oscillatable member for adjustment along said guide way relative'. to said. pivot for providing stitches of variable. length. transversely upon oscillation of. said oseil.`

latable member, andy means for adjusting. said slide member comprising a member bodily movable between. opposed adjustable stops, and means supported. by said: last member for pro- Viding, further adjustment of the slide member with said bodily adjustable member' in fixed'. adjusted position.

2. In the head of a zigzag sewing machine, a

vibratory needle guide provided with a guide way, a member oscillatable about a. pivot normal to the: guideV Way, `a slide member disposed in said guideway andi carried by said `oscillatable member 10x1 adjustment' alongy said guideway relative tol said pivot for providing stitches of variable length: transverselyA upon oscillation of said oscillatable member', and means for adjusting saidr slide member comprising a. member bodily movable in. the machine head between. opposed adinstable: stops, and means supported by said last mel'lnber4 forl varying thev position of the slide` member relatively' t'o the pivot while the bodily adjustable member visin fixed adjusted position. 3; In the headl oi a` zigzag sewing machine, a vibratory needle. guide provided with a guideway, a member oscillatablef abouta pivot normal. to the guid'eway, a. slide member disposed in` said gui'deway and carried by said oseildatable member for adjustnfienty along said guideway relative to said pivot for providing stitches of variablel length transversely upon. oscillation of said` oscillatable member, a collar movable bodily in the machine head between opposed adjlustable stops, a crank shaft journaled'l inthe collar and a connecting rod between thecrank shaft and the slide member for providing further adjustmentv of the latter with the collar in adjusted position.

. WERNER KURT' RUDOLF BEYER.

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