DE3824152C1 - Overcasting machine for forming a multi-thread overcasting seam - Google Patents

Abstract

The object is to design a sewing machine of the relevant generic type in such a way that a plurality of different stitch types according to the US Federal Standard Catalogue can be sewn at a minimum outlay in change-over terms. Various solutions are proposed for sewing alternately the stitch types 512 to 514 consisting of two needle threads, of a looper underthread and of a looper overcasting thread. In one solution, the carrier of the overcasting looper can be fixed in a first working position, in which the two needle threads are interlinked with the looper overcasting thread, and can be displaced into a second working position, in which only the needle thread adjacent to the edge of the sewing material is interlinked with the looper overcasting thread. In another solution, two thread eyes are provided at a specific distance from one another in the overcasting looper and the looper overcasting thread is threaded through one thread eye to form one stitch type and through the other thread eye to form the other stitch type. In addition, the formation of the stitch type 504 consisting of three threads is possible by the removal of a needle. To form a stitch type 502, consisting of a needle thread and of a looper underthread, without a looper overcasting thread, an overcasting looper having a fork-shaped catching tip is movable on the looper carrier out of a position of rest into a working position, in which the catching tip of the overcasting looper [lacuna] an extension of the fork leg remote from the needle [lacuna]... Original abstract incomplete. <IMAGE>

Description

The invention relates to an overlock sewing machine the preamble of claim 1, for its formation DE 36 39 390 A1 was used.

DE 36 39 390 A1 includes an overlock sewing machine at least three next to each other, after one straight direction across the material feed direction aligned, thread-guiding needles known in a needle holder are arranged, from which a needle or more needles are removable, with one thread-carrying looper with all needles works together and an overhand gripper, the one limited swinging movement is given, and that with everyone Needles furthest apart from the edge of the material removed needle works together.

With this overlock sewing machine one is neither from US Federal Standard Catalog, to which the stitch types mentioned below still refer to the meantime withdrawn DIN sheet 61 400 recorded Overlocked stitch type made up of at least five There are threads, three of which are needle threads that hold the sewing material penetrate during sewing and, related to the Distance from the edge of the material, in the first needle threads and a last needle thread can be distinguished, further a looper thread and one Overlocked looper thread on the material edge intertwined and with all needle threads in the Material are chained. The overcast thread runs between the looper thread with which it is attached to the  Edge of the fabric is chained and the first needle threads, parallel to the edge of the material at a distance from each other lie and all with the looper thread and with the Overlocked looper threads are chained. The last However, needle thread is only with the looper thread chained.

By inserting another thread-guiding needle in the needle holder is one of six threads, namely four Needle threads, a looper thread and one Overlocked looper thread existing stitch type producible in which the from the material edge on most distant needle thread only with the Looper thread, all others with the looper thread and the overlock thread are linked.

Is sewn with only two thread-guiding needles, then stitch type 514 is formed, which consists of two Needle threads, a looper thread and one Overlocked looper thread exists, the latter with two needle threads in the material and chained to the Edge of the fabric is entwined with the looper thread.

To form stitch type 504, which consists of a needle thread, a looper thread and one Overlocked looper thread exists on the material edge intertwined and in the material with the If the needle thread is linked, the second needle must be removed will.

Is made of three thread-guiding needles from the Maintain material edge furthest away and either the first or second needle removed, so can stitch type 512 is formed, in which the of the Only the most distant needle thread with the sewing material edge  the looper thread is chained in the material, while with the other needle thread looper and Overlocked hook thread in the sewing material and the latter intertwined at the edge of the material are.

Switching from one stitch type to another is done by adding or removing certain ones Needles. This means that several stitch types can be used be made using a sewing machine when adding one or more needles is next to the insertion re-threading the needle holder and tightening Needle thread mostly through a series of Thread guide eyelets and the eye of the needle required is relatively time consuming.

The invention has for its object a generic sewing machine so design that with minimal change several types of stitch can be sewn.

This task is performed by the generic sewing machine characteristic features of claims 1 and 5 and 6 solved.

According to the invention, various solutions are available To accomplish this task. The in Solution 1 marked solution makes the conversion or re-threading any thread unnecessary if stitch types 512 and 514 are sewn alternately. All that is needed is the overhand gripper from the one to be brought into the other working position.

Stitch type 504 can be done as in the prior art also by removing one needle.

A constructively advantageous training of Overlocker, its carrier and its Guide rod are specified in claim 2.  

The embodiment according to claim 3 is simple Way a secure fixation of the overhand gripper in reached the two working positions.

The measure according to claim 4 facilitates handling when changing from one stitch type to the other.

The approach characterized in claim 5 requires only threading the overlock thread from one thread eyelet to the other, to stitch types 512 and 514 alternately to sew.

The measures characterized in claim 6 the area of application of the overlock sewing machine expanded by the possibility of sewing stitch type 502.

The training according to claim 7 serves to secure the position of the overhand gripper with the fork-shaped Catch tip according to claim 6 and the training Claim 8 serves to facilitate the conversion of this Gripper when changing from resting to Working position and vice versa.

The invention is based on the Drawing explained in more detail. It shows

Fig. 1, the needles involved in the stitch formation and with gripper parts of their drive devices;

FIG. 2 shows an enlarged view of the hook guide rod with the hook carrier and two exemplary embodiments of the overlock gripper and the bottom hook, which works together with the needles, in a position of the thread-guiding overlock hook to form the stitch type 512 shown in FIG. 4;

Fig. 3 is a plan view of the arrangement in Fig. 2;

Fig. 4 is a perspective representation of the stitch type 512;

FIG. 5 is a view similar to FIG. 2 in a position of the thread-guiding overlock gripper to form the stitch type 514 shown in FIG. 7;

Fig. 6 is a plan view of the arrangement of Fig. 5;

Fig. 7 is a perspective view of stitch type 514;

Fig. 8 illustrates the formation of the stitch type 512;

Fig. 9 illustrates the formation of the stitch type 514;

FIG. 10 illustrates the formation of stitch type 502, in which the overlock gripper with the fork-shaped catching tip is shown in its working position, and

Fig. 11 is a perspective view showing the stitch type 502nd

As shown in FIG. 1, the needle drive lever 2 is fastened to the oscillating shaft 1 , the fork-shaped end 3 of which is articulated to the needle holder 4 , in which two thread-guiding needles 5, 6 are fastened interchangeably. The needle holder 4 is guided longitudinally on a slide rod 7 according to the arrow 8 , which is mounted on a pin 9 fixed to the housing. A thread-guiding lower looper 10 cooperates with the needles 5, 6 and is fastened in a looper holder 12 clamped onto the oscillating shaft 11 . The lower gripper 10 carries out an oscillating movement in accordance with the arrow 13 .

The overlock gripper guide rod 14 , which is longitudinally displaceably guided in a rotary sliding joint 15 , is driven by an oscillating shaft 16 via a drive lever 17 , which is connected in an articulated manner to the lower fork-shaped end 18 of the guide rod 14 . The upper end of the guide rod 14 is reduced in diameter, as can be seen in FIGS. 2 and 5. An angular gripper carrier 19 has in its one leg 20 a longitudinal slot 21 and is placed on the reduced end of the guide rod 14 . In the leg 22 of the gripper carrier 19 projecting downwards, a bore is provided for the passage of the shaft 23 of an overhand gripper 24 , in which it is fastened with a screw 25 . The gripper 24 has a thread catching shoulder 26 . In the guide rod 14 there is a bore directed obliquely to its longitudinal axis, in which the overlocking gripper 24 is displaceably guided with its shaft 23 .

The overlock gripper 24 has a thread bore 27 and a thread guide groove 28 , of which two cross bores, which are hereinafter referred to as thread eyelets 29, 30 and are spaced apart from one another, penetrate the overlock gripper 24 , the purpose of which will be described later. In practice, the overlock gripper 24 has only one thread eyelet. To show another solution, it is shown in the drawing with two thread eyelets 29 and 30 .

The leg 20 of the gripper carrier 19 has a shoulder 31 in which two V-shaped locking grooves 32, 33 are provided for a spring clip 34 , which rests with its legs 35, 36 on the end face of the guide rod 14 and one corresponding to the underside Grooves for the legs 35, 36 of the spring clip 34 having the clamping disc 37 is assigned. On the gripper carrier 19 is a handle 38 for displacing the gripper carrier 19 from the one to the other of the fixed in the gripper carrier 19 Überwendlichgreifers by the spring clip 34 in conjunction with the locking grooves 32, 33 specific working positions 24th

In one working position of the overlocking gripper 24 , in which the spring clip 34 engages in the locking groove 33 , the interaction between the needles 5, 6 movable in the direction of the arrow 8 , the lower gripper 10 driven in the direction of the arrow 13 and the one in the direction the arrow 39 movable overlock gripper 24 the stitch type 512, FIGS . 4 and 8 and in the other working position of the overlock gripper 24 , in which the spring clip 34 engages in the locking groove 32 , the stitch type 514, FIGS . 7 and 8 is formed.

To form the stitch type 502, FIGS . 10 and 11, an overlocking gripper 41 made of thin spring plate with a catching tip 44 formed from the legs 42, 43 of unequal length is placed with the interposition of a spacer 40 . The overlock gripper 41 has an angularly bent end 45 with an essentially rectangular recess 46 through which the extension 31 of the gripper carrier 19 projects to secure the overlock gripper 41 in position .

The overlocking gripper 41 is attached to the guide rod 14 with the interposition of a spring washer 47 together with the spring clip 34 and the clamping disk 37 by means of a screw 49 passed through the spring washer, a longitudinal slot 48 in the overlocking gripper, the disk 40 and the clamping disk 37 so that it can be shifted from a rest position into a working position in which its leg 43 of the catching tip 44 , which is distant from the needle 5 , is supplemented by the catching tip 50 of the overhand gripper 24 . To facilitate handling, the overlock gripper 41 is provided with a handle 51 .

Way of working

For the stitch type 512 shown in FIG. 4, which consists of the sewing threads 60, 61 , the lower looper thread 62 and the overlocking looper thread 63 , and its formation illustrated in FIG. 8, the overlocking looper thread 63 , which comes from a thread supply through the thread bore 27 and the thread groove 28 is fed, in which a solution is threaded through the thread eyelet 30 and the gripper carrier 19 is brought into its retracted first working position, shown in FIGS . 2 and 3, in which the spring clip 34 is locked in the latching groove 33 and the thread eyelet 29 is engaged based on Fig. 2, 3 and 8 on the right, and the yarn eyelet 30 is to the left of the path of movement the needle 5. The stitch formation is carried out in such a manner that the lower looper 10 enters in the Vorschwingbewegung in the loops 68, 69 of the needle threads 60 and 61 respectively. The overlock 24 receives at its upwardly and laterally directed arc movement indicated by the arrow 39 in Fig. 8 on the rear side of the lower looper 62 behind the thread eye 10a exiting lower looper thread 62 behind the thread eye 10a on. This is caught by the catch shoulder 26 of the lower looper 10 , so that it is, as shown in FIG. 8, as a loop over the lower looper 10 , the needle-side leg 64 for looping 65 with the overlocking looper thread 63 on the material edge and the leg 66 remote from the needle Catch shoulder 26 for looping 67 with the two needle thread loops 68 and 69 is sufficient. The part 70 of the overlocking hook thread 63 emerging from the thread eyelet 30 on the needle side and reaching to the looping 67 is presented by the sewing material feed of the needle 5 with the thread 60 in such a way that it passes through from the thread loop 30 to the looping 65 of the lower looper thread 62 the Überwendlichgreiferfaden 63 of Überwendlichgreiferfadens, stabs 24 triangle itself formed on the fabric edge reaching leg 70 to the needle-side leg of the lying around the overcast gripper 24 in its catch shoulder 26 lower looper thread 62 and the overlock, during the needle 6 piercing with the needle thread 61 only the workpiece W. The lower looper 10 throws off the needle thread loops 68 and 69 during its swinging back movement, which loops are then tightened by the thread layer, so that on the underside of the workpiece W the lower looper thread 62 is linked by the needle threads 60 and 61 . At the top of the workpiece W , the overlock thread is only linked to the needle thread 60 .

To change from stitch type 512 to stitch type 514, the gripper carrier 19 with the overlocking gripper 24 only needs to be pushed as far as the needles 5, 6 into the second working position such that the spring clip 34 engages in the locking groove 32 . In this second working position, FIGS. 5, 6 and 9, the path of movement of the needles 5 and 6 is to the right of the thread eyelet 30 . The needles 5 and 6, with the threads 60 and 61 pierce then, after the lower looper penetrated 10 in the needle thread loops 68, 69, added in his respective lower looper thread 62 by overcast gripper 24 on the side of the needle after the thread eye 10a, and the effect on the needle side the eyelet 30 of the Überwendlichgreifers 24 exiting Überwendlichgreiferfadenschenkel 70 to the needles 5, has been submitted to 6, both in the in the material feed through the leg 70 of the Überwendlichgreiferfadens 63, the thigh a 64 of the lower looper thread 62 and the overlock 24 triangle formed and penetrate the workpiece W. Here, the overlocking looper thread 63 is concatenated on the top of the sewing material with both needle threads 60, 61, and on the underside of the sewing material the bottom looper thread 62 intertwined on the edge of the sewing material with the overlocking looper thread 63 by throwing off the two needle thread loops 68, 69 it detects, which are passed through the thread layer to the bottom of the sewing material are tightened, also chained with two needle threads 60, 61 .

As in the prior art, the stitch type 504 can be formed by removing the right needle 5 with the hook carrier 19 of the overlock gripper 24 in the second working position or by omitting the left needle 6 with the hook carrier 19 and the overlocking hook 24 in the first working position.

The other approach provides for the formation of the stitch 512, Fig. 4, prior to leave the overlock 41 with the catch tip 44 in its rest position and the gripper carrier 19 with the overlock 24 second in its to the needles 5, 6 through shifted working position Fig to fix. 5 and 6, in which the spring clip is locked into the locking groove 32 34. The overlocking looper thread 63 fed through the thread bore 27 and the thread groove 28 is threaded through the thread eyelet 29 which, based on FIG. 5, lies to the left of the path of movement of the needle 5 and to the right of that of the needle 6 .

After the lower looper 10 in the loops 68, 69 of the needle threads 60, penetrated 61 at the beginning of the upward movement of the inserted needles 5, 6, was added to the Management of his looper thread 62 from the overlock 24 on the side of the needle after the thread eye 10a and the side of the needle on the has been implicated in the presenting position on the workpiece W out of the thread eye 29 of the Überwendlichgreifers 24 exiting leg 70, only the needle 5 pierces with the needle thread 60 in the bem material feed through the leg 70 of the Überwendlichgreiferfadens 63, the leg 64 of the lower looper thread 62 and the overlock 24 formed triangle, while the needle 6 with the needle thread 61, only the work W penetrates, so that the Überwendlichgreiferfaden 63 on the Nähgutunterseite with the needle thread 60 and the entangled with the Überwendlichgreiferfaden 63 on the fabric edge lower looper thread 62 by the ejection of the needle thread loops 68, 69 when swinging back the lower looper 10 and tightening the loops 68, 69 by the thread layer of the sewing machine on the underside of the sewing material is linked with both needle threads 60, 61 .

In order to sew the stitch type 514, FIG. 7, it is only necessary to pull the overlocking looper thread 63 with the overlocking hook 19 and the overlocking hook 24 and the overlocking hook 41 out of the thread eyelet 29 and threading them through the thread eyelet 30 with the position of the looper carrier 19 unchanged. The path of movement of both needles 5 and 6 is then, based on FIG. 5, to the right of the thread eyelet 30 . After the grippers have reached 10 and 24, the above-mentioned "Serving position" pierce both needles 5 and 6 in the in the material feed through the leg 70 of the Überwendlichgreiferfadens 63, the leg 64 of the lower looper thread 62 and the overlock 24 triangle formed a so that both the Überwendlichgreiferfaden 63 on the Nähgutoberseite and the entangled with the Überwendlichgreiferfaden 63 on the fabric edge lower looper thread 62 on the Nähgutunterseite after the ejection of the needle thread loops 68 and 69 in the return swinging motion of the lower looper 10 and the tightening by the thread guide of the sewing machine against the workpiece with the needle threads 60 and 61 is chained.

After removing one needle is also the second Solution the stitch type 504 possible.

To form stitch type 502, FIGS . 10 and 11, a needle, e.g. B. the needle 6 , removed, the overlocking looper thread 63 is pulled out of the thread eyelet 30 , the looper carrier 19 with the overlocking hook 24 is brought into its more distant working position from the needle 5 , in which the spring clip 34 is locked in the locking groove 33 and it is the overlock gripper 41 is shifted towards the tip 50 of the overlock gripper 24 into a working position in which the fork leg 43 of the catching tip 44 covers part of the hook tip 50 and this forms an extension of the fork leg 43 , as shown in FIG. 10.

The stitch formation then takes place in such a way that the lower looper 10 with the lower looper thread 62 penetrates into the needle thread loop 68 formed at the beginning of the upward movement of the inserted needle 5 , the fork-shaped catching tip 44 of the hook 41 together with the catching tip 50 of the overlocking hook 24 on the Needle side emerging from the thread eyelet 10 a, lower looper thread 62 , based on FIG. 10, to the left of the thread eyelet 10 a and placed around the workpiece edge over the workpiece W in front of the needle 5 . The needle 5 with the needle thread 60 then stabs 71 of the lower looper thread 62 and the overlock 41 between the ranging from the fork base of the catch tip 44 to the needle thread loop 68 legs. When the overhand gripper 41 and the lower gripper 10 return, the lower looper thread 62 is released from the catching tip 44 and brought by the lower looper 10 around the edge of the material to be sewn onto the underside of the workpiece, the loop 68 of the needle thread 60 being thrown off and tightened to the underside of the material by the thread layer of the sewing machine becomes. The lower looper thread 62 is thus linked to the needle thread 60 on the upper side and lower side of the sewing material.

Claims (8)

1. Overlock sewing machine to form a multi-thread overlock seam, with at least two thread-guiding needles arranged at a distance from one another, a thread-guiding lower looper receiving and shedding the needle thread loops and a thread-guiding overlocking gripper arranged on a looper carrier for picking up the looper of the lower looper through the needle thread loops and guiding the looper Überwendlichgreiferfadens characterized by the fabric edge and presenting the piercing of the needles into the through of the thread eye to the entanglement of the lower looper thread with the Überwendlichgreiferfaden at the fabric edge reaching leg of Überwendlichgreiferfadens, the needle-side leg of the lying around the overlock lower looper thread, and the overlock triangle formed, that the gripper carrier ( 19 ) can be locked in a first working position, in which both needles ( 5, 6 ) pierce the triangle and into a second work eitsstellung displaceable and can be determined there, in which only the needle ( 5 ) adjacent to the material edge pierces the triangle. 2. Overlock sewing machine according to claim 1, characterized in that the overlock hook ( 24 ) has a shaft ( 23 ) which is slidably arranged in a transverse bore of the guide rod ( 14 ) and fastened in the hook carrier ( 19 ) which on the free end of the guide rod ( 14 ) between the first and the second working position is arranged displaceable and lockable. 3. Overlock sewing machine according to claim 1 and 2, characterized in that on the hook carrier ( 19 ) two locking grooves ( 32, 33 ) are provided for a spring clip ( 34 ) attached to the guide rod ( 14 ). 4. Overlock sewing machine according to claim 1 to 3, characterized in that the hook carrier ( 19 ) has a handle ( 38 ). 5. Overlock sewing machine for forming a multi-thread overlock seam, with at least two thread-guiding needles arranged at a distance from one another, a thread-guiding lower looper receiving and shedding the needle thread loops and a thread-guiding overlock looper for picking up the looper thread over the looper thread passed through the needle loops and guiding the sewing material of the looper thread and presenting for the puncture of the needles into the leg of the overlocking hook thread extending from the eyelet for looping the lower looper thread with the overlocking hook thread on the edge of the material to be sewn, the needle-side leg of the lower hooking thread lying around the overlocking hook and the overlocking hook, characterized by the overlapping hook, 24 ) has two thread eyelets ( 29, 30 ) arranged at a distance corresponding to the distance between the needles ( 5, 6 ), through which the thread ( 63 ) guided by it the formation of two different Überwendlichnähten (stitch types 512, 514) is selectively carried out so that, when carrying out the overlock thread (63) through the one thread eye (29) comprising a needle (5) and in carrying out the Überwendlichgreiferfadens (63) by the other thread eyelet ( 30 ) pierce or insert both needles ( 5, 6 ) into the triangle. 6. Overlock sewing machine to form a two-thread overlock seam with only one thread-guiding needle, in which the overlock hook does not lead a thread, characterized in that the overlock hook ( 24 ) is covered by a hook ( 41 ) with a fork-shaped catching tip ( 44 ) in such a way that the tip ( 50 ) of the overhand gripper ( 24 ) supplements the fork tip ( 44 ) of the gripper ( 41 ) which is more distant from the needle ( 5 ) and that the gripper ( 41 ) on the gripper carrier ( 19 ) can be moved from a switch-off position to a working position and locked there in which he grips the lower looper thread ( 62 ) together with the tip ( 50 ) of the overlock gripper ( 24 ), guides it around the edge of the sewing material and for puncturing the needle ( 5 ) between the overlocking looper and its leg ( 71 ) reaching from the fork base to the sewing material edge submitted. 7. Overlock sewing machine according to claim 6, characterized in that the fork-shaped gripper ( 41 ) has an angularly bent end ( 45 ) with a substantially rectangular recess ( 46 ) through which an approach ( 31 ) of the looper carrier ( 19 ) for securing the position protrudes. 8. Overlock sewing machine according to claim 6 and 7, characterized in that the fork-shaped gripper ( 41 ) has a handle ( 51 ).