US1744882A - Machine for sewing openwork seams - Google Patents

Description

Jan. 28, 1930. E. GEGAUF IACHINQFOR SEWING OPENWORK S EAMS Filed April 27, 1925 dwwtw WW OW WM Patented Jan. 28, 1930 EUGEN 'GEGAUF, F STEGKBORN, SWITZERLAND LMACHINE .FOR SEWING :OPENWORK SEAMS Application filed April 27, 1925, Serial No.

This inventionrelatesto a machine for sewing-openwork seams. V In these machines the "two needles, arranged respectively on the right and left of the piercer, are guided in grooves provided in the latter.

In the operation of such machines three stitches are necessary for each openwork opening, the piercer and the needles penetrating the fabric. At the first stitch the needles liein -the grooves of the'piercer. At the sec- 0nd stitch they-move slightly away from the piercer and at the thirdstitch; the needles .againiin the grooves. Each time that the needles pierce the fabric, the thread forms a looponthe needle, which loop is grasped by the corresponding loop-taker and twisted with thethreadlocated in theloop spool. By this twisting of the needle'andloop thread, the openingmade in the fabricby thepiercer ishemmed. After the third stitch the fabric isshifted about 1 mm., .andafterwards the previously mentioned three stitches are repeatedwhereby to form a ladder-like openwork. The vloop-takers may be I either fixed in position or hinged.

The present invention relates to amachine .of thistype comprising two loop-takers fixed .in position andarranged onebehind the other in the line offeed.

According to the invention, the'needle plate andzthe feed dog-of the feedingdevice are arranged relatively to the two loop-takers, so that the'needle plate extends onlyas far as v lg-5 the 'circumference ofthespool carriers placed within Lthelooptztkers, while the ,feed dog also,at least.-in its initial position, does not overlap these carriers. p r

, The needle plate and the feed dog areso constructed that," the portion of the needle 0 plate between the two long friction surfaces of the feed dog isv connected with. the portions oftheneedle platelyingbeyond these two surfaces-bymembers which pass under the said friction surfaces and partly enter the feed do 1 l 3ymeansof this arrangement ofthe needle plate and feed -.dog with respect .tolloop-takers,.arranged onebehindthe other .in the line of .feed it is ;possible .to employ a reciprocat- 111g feeder in a machine for sewing openwork 26,002, and in Germany October 18, 1924.

seams .h avingl-fixed loop-takers arranged one fbehindthe otherin the line of-feed.

Hitherto the needle plates of machines for sewing openwork seams with reciprocating feeders have been constructed so that thepart of the needle plate located between the two long friction surfaces is connected with the part of the needle plate lying beyond these surfaces'by means o'f'members disposed both infront and rearofthetwo'long friction'surfaces of the feed dog.

Since in machineswith fixed loop -takers arrangedone behind the other in the line of feed boththe length of'the needle plate and the length ofthe feed dog are .limitedby the relative distance apart of the spool carriers, the two long frictionsurfaces of the feedingdevice could not be extended sufficiently far. for .efficient feeding of the material because of theproi isions of the parts connecting the nee- ,dle platein use up to the present time.

' When it was desired .to use reciprocating feeding devices with openwork machinesand loop-takers arranged one behind the other in the ,linelof feed,it wasznecessary to hinge the loop-takers with the result thatnot only the mechanism operating the latter, but also the spool carrier arresting mechanism werenextremely complicated. As also I in machines with hinged loop-takers, the needle plate, the feed dogand the presser partly covered these spool carriers the adjustment of the looptakers could'notbeeffected without difficulty. According to the present invention, in which neitherthe needle plate, nor the friction surfaces of the feed dogs, nor the p-resser overlap the spoolcasings, after withdrawal of two slidesbothloop-takers are laid open so that the thread can be easily watched from the moment when it is gripped by the floop-takers until'it is" released, and the'loop-takers can bereadily and accurately adjusted. The use ofa feed dog and :needle .plate which do not overlap the .spoolcarriershasbeeniknown in :multiple seaming machinesfbut the arrangementof thesemachines is quite different from i the present invent-ion is illustrated in the accompanying drawings, in which,

Figure 1 is a plan view of the lower part of a machine with fixed rotary loop-takers arranged in series, a reciprocating feeder with fixed friction members arranged between the looptakers, and with the needle plate;

Fig. 2 is a front elevation of Fig. 1, the loop takers being omitted for the sake of clearness; and

Figs. 3 and 4 are separate views of the feeder and of the needle plate respectively.

As shown in the drawing, the letter a (Fig. 1) indicates each of two fixed loop-takers arranged one behind the other in the line of feed and in which are housed the spool casings 1) containing the spools of under thread. The

friction member (1 which lies between the spool-casings b is secured by screws 6 in the vertical supporting arms a of the feeder 0, the arms being connected together by an intermediate member 0 The needle plate 9 is secured in the machine plate f by screws h. The needle plate is shaped so that its central part situated between the rubbing surfaces i, 2', is not, as heretofore, connected to the outer parts 9 and g by members situated in front and rear of the rubbing surfaces 'i, i and 2' but by means of a connecting member n which passes from the central part g" underneath a part of the long surfaces 71 and '2' and at the points a enters slots is provided in the feed dog, and is connected above a part (Z of the feed dog to parts 9 and g with which the needle plate is secured to the machine plate 7. The parts 9, g of the needle plate 9 directly abut against the rubbing surfaces at the same level and width as the central part 9 The letters 0 (Fig. 4) indicate slots in the needle plate into which the rubbing surfaces 2', i and i fit. The looptakers can be covered over from above during the work by slidable plates m. The spool casing b, with the spools contained therein, can be easily taken out without the use of tools by drawing out the plates m. A recess 1 in the needle plate holds the tips of each of the carriers of the spool casings.

It will thus be seen that due to the elimination of the connecting members formerly provided in the front and rear of the three friction surfaces 2', 2' and 2' the friction surfaces of the feeder can be extended in the feeding direction and that a perfectly satisfactory feed can be obtained in o nwork sewing machines even when operate in high speed.

\Vhat I claim is 1. A hemstitching-sewing machine comprising loop-takers having stationary axes arranged one behind the other in the line of feed, a spool casing in each of these looptakers, a feeder arranged between said looptakers, a needle-plate secured to the machineframe, apertures in this needle plate, parts of the feeder extendin through these apertures, the dimensions on t 1e line of feed of the needle-plate and of said parts of the feeder being less than the smallest distance between the circumferences of said spool-casings.

2. A hemstitching-sewing machine comprising loop-takers having stationary axes arranged one behind the other in the line of feed, a spool casing in each of these looptakers, a needle-plate secured to the machine frame without overlapping said spool-casings, apertures in the needle plate at the right and left hand side ofits central portion extending from the front to the rear edge of the needle plate, a feeder adapted to operate between the loop-takers, rubbing surfaces on this feeder placed in said apertures of the needle-plate and having in the initial position of the feeder at least one of their front or rear edges flush with the corresponding edge of the needle-plate, a plate mounted in the machine-plate above each loop-taker and adapted to slide in the machine-plate in the direction of feed, each of these plates abutting the corresponding edge of the needle-plate.

3. In a hemstitching-sewing machine a needle-plate, a U-shaped feeding member eneath this needle-plate, a feed-dog secured on top of the upwardly extending arms of the feeding member, apertures in the needle-plate at the right and left hand side and in rear of the central portion thereof, rubbing surfaces on the feed-dog extending through said apertures, that portion of the needle plate between said rubbing surfaces being connected with the portions of the needle-plate lying beyond said surfaces by members which pass under said rubbing surfaces and partly enter the feed-dog, said rubbing surfaces being at least on one end flush with the corresponding edge of the needle plate in the initial position of the feeding member.

4. A sewing machine for openwork seams comprising a plurality of loop-takers having fixed axes arranged one behind the other in the line of feed, a feeder, a feed-dog mounted on the feeder, rubbing surfaces on the feeddog, a needle plate having a central ortion arranged between said rubbing sur aces, a portion of the needle plate on both sides of the central portion passing beneath one of the rubbin surfaces and extendin externally thereof through the feed-dog and continuing transversely to the direction of feed above the feed-dog on a level with the central portion of the needle-plate.

5. A hemstitching sewing machine comprising loop-takers having stationary axes arranged one behind the other in the line of feed, a spool casing in each of these looptakers, a needle-plate secured to the machine frame without overlapping said spool casings, a feeder adapted to operate between said loop-takers and provided with two vertical arms, a feed-dog secured on said arms, and

horizontal rubbing surfaces on said feed-dog on each side of the line of feed intersecting the top face of said needle-plate and operating in a path having substantially the same. dimension in the line of feed as the needleplate, this dimension being less than the shortest distance between the circumferences of the said spool casings.

In testimony whereof I aifix my signature.

EUGEN GEGAUF.

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