US1546229A - Attachment for sewing machines - Google Patents

Description

July 14, 1925. 1,546,229

H GROSSMANN ET AL ATTACHMENT FOR SEWING MACHINES Filed Nov. 12, 1923 Patented July 14, 1925.

PA TENTI'I -o FF-IC'E.

HERMANN GROSSMANN AND ALEXANDER GRossMA-Niv, or, nansnnn, GERMANY.

ATTACHMENT ro-R SEWING MACHINES.

Application filed November 12, 1923. Serial No. 674,379.

To all whom it may concern Be it known that we, HERMANN Gnoss- MANN and ALEX NDER GROssMANN, citizens of Germany, residing at Dresden, Germany, have invented certain new and useful Improvements in Attachments for Sewing Ma- 'chines, of which the following is a specific-a- 't'ion.

Our invention refers to an attachment for sewing "machines, and more especially for flower stitch sewing machines for use in the inianufacture of straw hats and the like. Its gparticular object is to improve that part of the mechanism which comprises the guide which in known machines of this kind is sideways adjustable and carries the member for holding the work piece down on the table, as well as a member serving to guide the strip consisting of plaited work or the like which shall be sewed onto the straw hat, T

this member serving also to separate the strip from the work piece. g In the attachment for sewing machines according to the present invention, this guidstead of a strip of uniformwidth, so-called mg and separating member is arranged to be lisplaced sideways in order to insure a uniform width of the stitches, both at the work piece and the strip to be connected therewith. This novel strip guide further allows keeplng its position also in" the case where,in-

inserts shall be sewed on, if the hat'shall be broader on one side thanon the other. Ac-

cording to the present invention, the dc:

pressing member disposed between the strip guide and the left hand end face of the guide is arranged to be removed in order to allow exchanging it, and can be made to swing upwards, the pressure exerted by itupon thestrip being variable.

This and further improvements are more fully described hereinafter and illustrated in v the accompanying drawings forming part ofthis specification and illustrating an at 'tachment of the kind aforesaid embodying my invention by way of example.

drawings Figure 1 is an elevation partly'in vertical Figure 2 isan end elevation,

' portion of the attachment.

'p ably moimte d way of the sewing of the ways under the action the machine during-the sewing. f The. strip sleeve the teethofrod-l4 and'prevents it from shaking and from-any undesirable movep into a circumferential Figure 3 is a rear view of the'left hand machine, as usual. 44 is the member which serves for holding the work piece applied to the table or needle plate, this member belng arranged .for lateral displacement and adjustment. 7 In the concave rear surface 2 guide a longitudinal boring 3 is provided surrounding a rack 4 which can be displaced by means of the toothed cylindrical portion 50f the spindle 6 which meshes with the rack 4 and can be 0 erated by means of the head 7 The free en of the rack 4 carries the scythe-shaped strip guide .8. A screw 10 projecting into the annular groove 9 of the pindle 6 prevents this latter from being withdrawn from its seat. The portion of the screw 10 which projects into the groove 9 does not fill the entire width of the groove, thus allowing the spindle 6 to be shifted longitudinally to some extent. he coil spring 11 inserted between the head 7 and guideltends to press the head outwards, whereby the lower edge of groove 9 is pressed against the screw 10, thus preventing the rack4 from 'beingfdisplaced sideof theshocks acting on guide 8 is thus arranged to be correctlyadjusted with regard to the needle, in order to insure a uniform width of stitch. a

The arm 13.disposedbetween thev strip guide 8 and the left hand end plate12 ofithe guide 1 and which serves to keep the striYi applied against the needle 'plateis bento? atright angle-s froin a toothed rod 14 f quadrangular section. ,This rod is dis ose in the quadrangular opening 15 of-a sleeve 16 located'inthe cylindrical boring of the projecting portion 18 of the guide. The spring 19 fixedv tothe inner wallof the projects with slight pressure. between ments relatively to sleeve 16. without, however, preventing it from being removed for L, the'purposeof replacing it. .On rod 14 being In the of spring 19 causes it to recede into an: in-

. denture 43 provided in the wall of sleeve 16.

wlthdrawmthe teeth acting on the free end A threaded pin 21 projecting from below groove 20 of sleeve 16 prevents this latter from .being displaced laterally, while allowing it to turnabout its longitudinal axis. As thisturning movement extends only over part of a circle,,the groove 20, does not extend. entirely around thesleeve,

To the rig'ht; ofithe bearing 18 a'i'fl anged disc 22 is located on sleeve 16', this disc sur.

portion 25 of the handle 26 is" screwed. In

I the hollow 27 of thishandlea.eoilaspring 28 is V, inserted, which serves for; pressing a .pin

29 into a narrow, notch 3010f theipart 23.

' "sleeve 31 is-located on the bush 16 one "side of the disc 22, anddn the lett handportion'32 otjsleevefil there is disposeda clock ispring 33having one endinserted in. sleeve 116 Wllll the other endv projects into a; lateralindenturefi i of bush 31. lhe;bush 31 isjturtherjprovided with severalindentures 1.36 corresponding to the projection241 on the 2 pa t'2 ig; 5)

7 there is'disposeda .coil' spring 3 Sur unding e e. 6, .0116; d t

Qspring r fstingagainst a ring 40 .fiXed on the Z rightfhand endof.sleeve 16-by means of a ,'screW 39, his spring serving to press sleeve l 31 against, the piece 22 the pressure exerted jby' thespring"being controlled ,by the position 'of ring 10. 'flhe spring pressurecan thus be regulated in order to safeguardoooperation between projection 24 inden tures 36 under all circumstancesand al- 1 though theispring tension might decrease.

If 'sleeve gi ql is .pulled to the right against I the action of spring38, it will pass across rin'gtOand will release the projection 241, be-

ing n'ow freeto be turned about sleeve 16 by itself, in. order toi place another ind'enture 36 opposite]projectiong24 whereby the tension of spring 33 and with. it the pressure 4Q. exerted by the member sewed on islessened or increased.

- i In ordf r to cause'the, member upwards, the

) 13: to swing a handle 26; is pressed dowmjthe pin 29 leaving. notch 30. further turne5 "ing the'disc'22 which carniessleeve 31 along -withit, spring ,33 is placed 11116161 tension until} it Torres .sleeve 1:16 ,i to partake in the 'ffi lfni i' "foil .31. whe e y. s od .1 is

' tnrned about its longitudinal axis, carr-ying far 13 into fth e j position shown]: in dotted lines Whil'e the parF .QI'Q in this p.ositi on ,fthe pressure eitertedby pin 29 upon -bearing 18 prevents. any uunjdesirable jdis 5 p-lacementfof the "parts. Then handle 26 is moved hack, sleeve-'16 will be turned back I ,also together with {disc 22 and {bush 31, whereby,-1 "a"'r m"13 jis causedto apply itself against the strip to be sewed o Byhandle 6o 'ggibeing swung black g'tu'rther until its }pin 7 29 again enters .notch 30, the predetermined ,"pre f n ex rted 9 i by. spring-I 33 i mam Rain d; i .f :1;

he upper portion 1 "of "the guide which supports the members 8 and l3"ispivoted to In the right ,hand portion 1'3 onthe stripto be the base 42 'displaceably mounted on the machine by means of a vertical bolt 41 and can thus be swung around in a horizontal 1 plane in the direction"towards the operator.

, In .view of the fact that the strip to be sewed on 'extends'across the guide rod 4, the upper portion 1 .cannot...be swung upwards, as in former machines.

We wish it to beunderstood. thatwe do v,notidesire to be limited' to the exacti details of construction shown and described, for bvious modifications will occurtoaperson skilledin'the art. 7 'l/Veclaim: pp

1.. Attachment ntor sewing machinesrcomprising a guide, isaid guide, aplate on the outer end. of said rack, :means for displacing. said Irack, a lsleeve .rotatably .oarriediin said :guide. and Xtending in parallel with said rack,,means for vrotatingi said sleeve, a..bar held against ,rotation in.:.s aid sleeveiand adaptedto slide therein; and an arm at theouter end ot said har. J i r Attachment forsewing machinescomprising a guide,.a Iackadapted to slide in 'said guide, aflplate on thev outer. end 0t said racln. a pinion rotatably. harried in said ,guide iandadapted. to, mesh with said. rack, means for rotating said. pinion, a sleeve. .rotatably carried in ,sa i,l "guns. and ,.extending in :para-llel .Withsaid racli', .1neans. torlr'otating said. sleeve, -a bar held against. rotation in said sleeve and adapted ,to, slide therein anol an arm at; the" outer'endiof said bar,

3. Attachment tori, sewing machines comprising-.-a 'gi'1ide,-a,rack adapted to slide in s'aid'guide, spin onlthe outer end ofsaid rack, a pinion adapted to mesh with .said

rack, a spindle secured to said pinion, said spindle being rotatably carried and'adapted ;to slide, in said guide, a. shoulder. on said spindle, a pin 1n said .guide, adaptedto. en-

gage shouldenia{spring adapted-to ex- 6 ft aXial pressure on said spindle 'so ia s to hold said sh'oulderiagainst' salifdppinfa sleeve rotatably carried in said guide andi exteinding in parallel with said rack, means for rotating, said sleeve, a bar held against ram 1 tion in ssaid sleeve and adapted to; slide 'therein, and anarm-at the out'er enfd ofgsaid 4. :Attachrnent 'for sewing inachines com- ;prisingi a guide, a eak 7 adapted v to slide in said guide, a plate on the outerentl of said rack, means fordisplacing said rack, a sleeve rotatab ly carried tin said, guide and extending in parallel witl said rack means for rotating said sleeve, abar; ot polygonal cross section adaptedjto slide iinf a corresponding hole in said sleeve, an arises the v, outerr end of said'b'ar; 'a bush having notches jat'itsinner eiidand rotatablycarried on said i sleeve, a spiral springgresiliently connecting said Sleeve sateen 'bu'shja magazines till a rack adapted to slide in a rotatably carried on said sleeve, means for rotating said disc and for temporarily securing said disc against rotation relatively to said guide, and a tooth on said disc adapted to engage one of the notches at the end of said bush.

5. Attachment for sewing machines comprising a guide, a rack adapted to slide in said guide, a plate on the outer end of said rack, means for displacing said rack, a sleeve rotatably carried in said guide and extending parallel with said rack, means for rotating said sleeve, a bar of polygonal cross section adapted to slide in a corresponding hole in said sleeve, an arm at the outer end *of said bar, a bush having notches at its inner end and rotatably carried on said sleeve, a spiral spring resiliently connecting said sleeve with said bush, a flanged disc rotatably carried on said sleeve, a handle secured to said disc, a spring-actuated looking pin in said handle adapted to engage a recess in said guide, and a tooth onsaid disc adapted to engage one or the other notch at the end of said bush.

6. Attachment for sewing machine comprising a guide, a rack adapted to slide in said guide, a plate on the outer end of said rack, means for displacing said rack, a sleeve rotatably carried in said guide and extending in parallel with said rack, means for rotating said sleeve, a bar of polygonal cross section adapted to slide in a corresponding 'hole in said sleeve, an arm at the outer end of said bar, a bush having notches at its inner end and rot-atably carried on said sleeve, a spiral spring resiliently connecting said sleeve with said bush, a flanged disc rotatably carried on said sleeve, means for rotating said disc and for temporarily securing said disc against rotation relatively to said guide, a tooth on said disc adapted to' engage one or the other notch at the end of said bush, a coiled spring tending to force said bush against said tooth, and means for varying the tension of said spring.

In testimony whereof We aflix our signatures.

HERMANN GROSSMANN. ALEXANDER GROSSMAN N.

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