DE642090C - Sewing machine for making a single thread seam - Google Patents

Description

Sewing machine for producing a single thread seam The invention relates to a hook device for a thread sewing machine, which has the task of a to produce a single-thread, fixed sewing machine seam, namely a single-thread seam, which is only fed by the upper spool of thread, i.e. only by the needle thread and at which in succession a long drawn out thread main loop with from the same Thread formed secondary thread loops is entangled like a lockstitch. It's falling This removes the bobbin and the annoying winding is avoided.

Sewing machines that produce this thread seam are already known. With these there is a rotating or swinging one under the throat plate Loop catcher with a stationary, so-called thread loop conductor cooperates. The thread loop conductor has a catch hook in all constructions and switching elements that, corresponding to the stitch formation, .the one that glides over it Catch the thread loop or let it slip through and, depending on the case, a main loop or secondary loop is formed, take action. For the sake of that end of each main loop comes to lie properly spread under the needle so that it is safely pierced by this, have the thread loops = conductors either a feather, a finger or a horn or a correspondingly designed one Catch hook, which by the action of a switching element of the sewing machine, the main loop releases again at the necessary moment. These well-known machines now have the Disadvantage that you can only sew forwards and not backwards, because the hook for Catching the loop is in the feed direction, so this is in a changing direction would be pulled off the hook. There is also the disadvantage that they do not have a device To adjust the lower thread tension, the seams are therefore not in one can bring the right tension.

According to the invention, a sewing capsule is now used as a thread loop conductor. which in place of the. The bobbin case in the hook of a standard lockstitch round hook sewing machine can be used, In this case the round grab acts as the loop catcher represent.

This sewing capsule thus has the opposite of the known thread loop conductor the advantage that they do not need a special sewing machine for their work. It Rather, the usual two-ply fed or exchanged accordingly of the capsules produce the single-thread seam on a circular rapier sewing machine. Furthermore, according to the invention, the sewing capsule has such a hook guide that with it forward and can be sewn backwards. She also has a Device for adjusting the lower thread tension.

The seam made with the sewing capsule differs from the corresponding to known seams in that longer main loops are formed. In addition, the main loops of the seam are simply looped around by the secondary loops except for the last stitches, which, going through the legs of the main loop, loop around them individually and thus secure the end of each main loop in a special way (Fig * 34) - So a main loop is pulled out of the needle thread, which is from several secondary loops formed from the same thread is wrapped around the form the actual stitches and attach the main loop to the fabric. After on this way the main loop is fixed, the needle pierces through the end of the same, and a new main loop is formed. This thus marks the end of the first Main loop, whereupon the whole process repeats itself continuously.

The work processes described are carried out using the in a circular rapier sewing machine used sewing capsule achieved in that the round looper the needle thread in a known Way, pulls it out in a loop and puts it around the sewing capsule. At the usual point, the loop slides off and starts as the main loop to a catch hook that runs in a guide in the sewing capsule that goes into the needle hole the machine ends. The catch hook, which protrudes from the guide ready to be caught, is pulled up by tightening the loop and disappears within the Guide. The catch hook is opened by a suitable braking device inside the capsule held with the main loop shortly after disappearing in the guide. The next, The loop brought around by the gripper now slides over the loop that has disappeared in the guide Catch hook as a secondary loop and releases the aforementioned by turning a lever Brake device off again, so that the main loop with catch hooks through the material slide is pulled upwards unhindered, with stitch by stitch the secondary loops around the main bow and pin it to the fabric. By a triggering device the catch hook, when it reaches the top, releases the end of the main loop and slides return to the starting position by means of a spring balancer. The end of the main loop lies now around the upper part of the guide through which the needle goes, whereby the round gripper pulls out a new loop. This is again from the catch hook caught as a main loop and thus forms a connection with the @@ "K @ -herigen, the end of which it determines, after which '_skh repeats the whole process continuously.

'' The sewing capsule is just like the bobbin case in the Round gripper used. It is necessary for the old and newly manufactured circular rapier sewing machines, that the incision through which the nose of the usual bobbin case goes, the hook guide of the sewing capsule is enlarged accordingly. The leeway is allowed only be so far that the thread comfortably goes through from both sides; as is to make the corresponding enlargement of the needle hole. To with the hook guide To get into the needle hole behind the material slide, the hook guide must be tipped in a little to which this is provided with a joint. To work with the usual Bobbin bobbin case have all of these minor changes to the circular hook sewing machine no adverse influence.

The drawing represents an embodiment of the subject matter of the invention represent.

Fig. I shows the parts of a circular rapier sewing machine necessary for illustration with a correspondingly enlarged section of the round gripper housing E and an enlarged one Needle hole of throat plate D. At the same time it is shown how the sewing capsule in the Circular rapier sewing machine is used.

The needle is labeled A while & represents the presser foot.

The closure F, which is placed on the cover G of the sewing capsule, is used to fasten the sewing capsule on the axis h of the round hook H. Spring f is mounted so that its semicircular cut-out front part protrudes into the axis passage hole g of the sewing capsule, if the shutter F is in the closed position as shown in FIG. Spring f lies on a bulge and is therefore already slightly bent so that it can be opened by lever f l. can be pushed back more safely. It is screwed to the cover G by means of strip f2, while it is held in a displaceable manner under strip f3. Lever fl, which is rotatably attached to the cover G by pins f ' and fa, extends in the rest position so obliquely upwards that the handle fe of the lever f 1 does not protrude beyond the hook guide I, so that the loops get over it unhindered. The semicircular cut-out front part of the spring f holds the sewing capsule in the known manner like the closure of the bobbin case on the axis h of the round looper H. If the sewing capsule is to be removed from the round gripper again, the lever / 'is raised with the aid of the handle fs, the edges f4 and f,' of the lever f1 pushing against the spring f (FIG. 4) and pushing it back. This releases the rotary hook axis h and the sewing capsule can be removed. Because spring f presses against the edges f4 and f5 of the lever f1, the latter is held in a resting position. There is no danger that it will open by itself. Fig. 3 shows the cover G with lever f1 without spring f and without strips f2 and f3. At the same time you can see the mounting of the pins f 'and f8 of the lever f1 in recesses under the bar f3.

In order to get into the needle hole with the hook guide I when inserting the sewing capsule behind the material slide, the same is provided with a hinge i3. The hook guide I consists of two parts, the lower part i and the upper part il. Both parts are connected by a hinge 11, as a result of which the upper part 11 can be tilted backwards. Fig. 5 shows the insertion of the suturing capsule. With the aid of the lever il, which is firmly connected to the upper part il of the hook guide I, the aforementioned upper part il is guided under the material slide into the needle hole. If the upper part il is inserted into the needle hole as shown in FIG. 6, the cutout i4 of the lever il, since it presses resiliently against the side wall of the hook guide I, snaps behind the attachment il. The handle f6 of the lock F, which was opened during the process explained, now lies in front of the lever i2 and secures it against jumping out of its own accord, as a result of which the entire hook guide I is fixed immovably rigid. Reinforcement i6, which is firmly connected to the lower part i of the hook guide I, covers the joint part of the hook guide I. The opposite side is already covered and secured by lever il. This page is illustrated by FIG. It shows the upper part of the hook guide I with lever i2 in the tilted position; at the same time it is indicated in dotted lines how the section i4 of the lever i = is behind then approach i5. If the hook guide I is to be tilted when removing or inserting the sewing capsule, after lifting the handle fs of the locking lever fl one must grasp under the correspondingly cut out handle i7 of the lever il and pull the lever i2 down from the attachment i5 by pulling upwards. Approach il is formed by a triangular strip, the inclined inner edge of which the cutout i4 of the lever i2 clings to. 8 shows the interior view of the sewing capsule with the individual parts located inside it. The tube g3 for the gripper axis forms a firmly connected piece with the base g1 of the capsule housing g2. On the side opposite the housing base g1 is the cover G, which is screwed to the edge of the capsule housing g2 by means of small pins g4, g5 and gl. The diameter of the axle passage hole g on the cover G corresponds to the inner diameter of the axle tube g3. Axis tube g3 only goes up to the underside of the cover, whereas the axis h of the round gripper H goes into the cover so that the spring f can grasp.

To regulate the bobbin thread tension, the slotted head of the axis k of the gear wheel k1, which is visible on the rear side of the sewing capsule (FIG. 14), is turned by means of a screwdriver. Axis k and gear k1 consist of one piece. The inner end of the axis k is fixed in an angle k2 screwed onto the capsule housing wall g2. The teeth of the wheel k1 mesh with the teeth of the wheel. k3. Gear wheel k3 consists of one piece with brake wheel k4 and has the axle tube g3 as the axis. Brake wheel k4 is hexagonal and is held in place by spring k5. The spring k5 is screwed tightly to the block k6 and this is fastened again to the capsule housing wall g2. If gear k1 is now rotated through axis k, then tooth braid k3 is also rotated by the meshing of the teeth with gear k1, whereby at the same time braking: ad k4 rotates due to its fixed connection with gear k3. The spring k5, which presses into an excess of the brake wheel k4, yields, stretches (FIG. 13) and, as the wheel rotates further, presses into the next excess of the brake wheel k4 (FIG. 1a). Disk N (Fig. Rz) and spiral spring 0 (Fig. 1o) are mounted on brake wheel k4, also with axle tube g3 as the axle. Disk N lies between brake wheel k4 and spiral spring 0 and serves to secure and provide a solid base for the latter. On the brake wheel k4 there is a pin k 'which goes through a hole n in the disk N and through the initial loop 01 of the spiral spring 0. Pin k 'thus represents the only connection between brake wheel k4 and spiral spring 0. Brake wheel Y and reel r1 are now seated on spiral spring 0. Both are made of one piece and also have axle tube g3 as the axle. Brake wheel r is connected to spiral spring 0 by pin r2, namely pin r2 is stuck on brake wheel r, while spiral spring 0 with the outer loop 02 is attached. Tape roll r1 with brake wheel r has a groove r5 in the middle around its circumference to accommodate tape r3. It can be made of fabric, fiber, steel, or other suitable material. In the groove r5 of the tape roll r1, the tape r3 is fastened with a screw r4, which goes through a loop (Fig.9i). The band r3 goes from the brake wheel r through a band guide S, which is screwed to the cover G (FIGS. 15 and 16), and is guided through the same to the hook guide I. Here belt r3 is connected to catching device P (Fig. 2z), namely the end of the belt r3 is provided with an eyelet r1 'which is connected to the eyelet p2 located on the lower hook guide roller p1 (Figs. 21 and 22). The tensioned spiral spring 0 now rotates clockwise through pin r2, brake wheel r and tape roll r1. Tape r3 rolls up on tape roll r1 and pulls the same with its end attached to the catch hook P into the initial position, where it is held in the gripping position by tape r3. The tensioned spiral spring 0 is held in its tensioned position by spring k5 and brake wheel k4. Conversely, however, by turning the axis k, the effect of the spring 0 can be overcome and the tension of the spiral spring 0 can be regulated.

Brake wheel r exerts a braking effect on the catch hook P via tape roll r1 and tape r3, namely at the point at which the latter has disappeared in the hook guide I and is just bending with its upper hook part p5 over the springs ia and i9 (Fig. 22 , 27 and 28). Brake wheel r has an incision r6 on its upper edge (Fig. 9). In this incision r9, attached to a spring r 'which is screwed to the inside of the capsule housing wall g', there is a brake pad r8 under pressure, the lower, front edge of which is beveled. In a hole through the length of the lower part of the brake pad ra there is a pin r ° at the front, which because of its head r19 can only come out to the rear, since the hole narrows in the last third at the front. A spring r11 lies against the head r19 of the pin r9 with slight pressure and behind it a screw r12. Pin r9 is now pushed forward by about half its length by spring r11. On the upper side of the brake pad rs the spring r 'is bent like a handle, so that the lever r14 can engage through its bend r13. Lever r14 is rotatably attached to bracket g 'of cover G by pin r15. Fig. 17 shows the brake pad on a greatly enlarged scale.

The catch hook P connected to the band r3 runs in the hook guide 1. It consists of roller p1 with eyelet p2 and roller p3. The two rollers p1 and p ' are connected to one another by a double intermediate piece p4, the two legs of which between them a space to accommodate the release lever p19 and the release hook let p11. On the roller p3 there is a forked hook part p5 and a guide nose p ″. Hook part p5 is bent into a hook and only forked as far as the release hook p11 rests in it. Hook p5 has to catch and hold the main loop. Between the legs of the hook part p 'and of the intermediate piece p'1 and the nose p " the release hook p11 with lever p19. Lever p1 ° is articulated in its center through pin p1 = connected to the lower end of the release hook p11 and through Hole p13 and pin p 'rotatably attached to the nose p9 of the intermediate piece p4 (Fig. 23). The upper part of the release hook p11 rests in the upper part of the hook p5. The leg p14 of the hook p11 goes through the guide nose p °, the pin p 'blocks the leg p14 to the outside. Will now lever p19 on its rear At the end of the pls push down, the same release hook p11 also pulls below and at the same time by its connection with Nasepe through pin p9 and hole p13 the remaining hook upwards. The upper part of the Release hook p11, when pulled down, fills the debauchery of the catch hook part p5 (Fig. 21) and triggers a loop located there. Figures 23 to 23 c show the catch hook P with its individual parts disassembled.

The hook guide I is used to hold the hook P with the tape r3 and establishes a connection between the lower capsule part and the needle hole The hook guide I consists of three individual guides. In the lower part i19 The release lever p19 protrudes with the release resistance i13 of the hook guide 1 into it. In the middle part p11 of the hook guide l, the rollers p1 and p3 of the run Catch hook P. While the lower part i1 ° of the hook guide I consists of a channel, whose width is about a third of the total width of the hook guide I and whose Side walls widen upwards, corresponds to the width of the middle part of the guide part ill the inside diameter of the hook guide I. The upper part i12 the hook guide I narrows again by half. As a result, guide i11 rests between the protruding edges of the guide i1 ° and a12, and these serve the rollers p1 and p3 as sliding surfaces. During guidance i1 ° downwards shortly before leaving the Lid G ends, guide ill makes a sharp bend towards the inside of the capsule, thereby will causes catch hook P, whose rollers p1 and p3 run in guide i11, far behind protrudes at the front over the guide a`12.

By having hook guide I at its upper end to the opened tube runs out, which is inserted into the needle hole, so that the needle through the same you can sew forwards or backwards depending on your preference. It happens in that the end of each main loop is around the open pipe the outgoing part of the hook guide I lies around. The end of the main loops is As a result, it can be rotated around the needle in all directions, creating the end loop can be peeled off on each side. So it is always right to the needle. This The process is explained in detail in the process described below.

Fig. 15 shows the cover G from the outside, and that can be seen here in dashed lines Lines the position of the tape roll r1 and tape guide S and also of the tape r3.

16 shows the cover G from the inside. Here you can see how tape guide S is almost screwed to the inside of the cover G, and likewise the position of the Pins g4, g5 and gl.

Fig. 35 shows the suturing capsule in approximately normal size, namely in front view, while Fig. 36 shows the side view.

To achieve the smallest possible end loop, the hook guide I received a section i14 in its upper part (Figs. 37 and 38).

Is now after inserting the sewing capsule in the round hook of the sewing machine If the fabric is laid on and sewing started, the following process takes place from: As soon as the needle goes down, pierce the fabric and insert it into the upper part of the The hook guide I, which runs out towards the open pipes, enters the expanded The needle hole is inserted, the round looper H grabs the thread and pulls it into a loop from - (Fig. 24 and 25), bring them around (Fig. 26) until they reach the thread lever of the Pulls the sewing machine down by going up in front of the hook. Now it becomes the main loop from the catch hook P, which in the initial position over the edge of the hook guide I (Fig. 24 and 25) protrudes, caught (Fig. 27) and at the same time still from the thread lever of the sewing machine torn up. The catch hook P, torn up with the main loop, disappears now into the hook guide 1 (Fig. 28 and 2c9), pushes through the main loop around it, which gives the hook part p5 of the hook P a larger circumference, the springs i8 and i9 apart and then settles through the over the edges of the hook part p5 lying thread on the springs (Fig. 22 ", - 7,: 28 and 29 :) after going through brake wheel r is recorded by volume r3. The brake pad r8 hits the front edge r "of the incision r6, with pin r9, pressed against spring r11, in the brake pad rs disappears (Fig. 19). Since the catch hook P with its upper part p5 just above the both springs ig and i3, it can be released when the loop tension of no longer back at the top and remains sunk in the hook guide I (Fig. 22, 27, 28 and 29.). The two springs i8 and i2 are right and left on the edges of the top Guide part ill attached and only leave the empty catch hook P down. by. The round gripper H now brings around a new loop. This slides again pulled by the thread lever of the sewing machine, from the hook H over the sunk Catch hook P away, pulls lever r14 (Fig. 20, 28, 29 and 30) and staples completely pulled up, the main loop on the fabric as the first secondary loop. By the By turning the lever r14, the brake pad re emerges from the incision r6 of the brake wheel r upscale. Pin rl, pressed by the spring rll, is released, pushes forward and sits up the upper edge of the brake wheel r on (Fig. 2o and 29). This can do the same thing turn, and the catch hook P pulled through band r3 now goes with the main loop, Pulled through the material slide, unhindered upwards, while stitch by stitch Place further secondary loops, brought around by looper H, around the main loop. So that the catch hook P does not come out when sliding around the curvature of the hook guide I and prevents the secondary loops, there is a reinforcement il the hook guide I here attached (Fig.2i). Shortly after the catch hook P with the main loop the reinforced Has left part of the hook guide I towards the top, the needle goes through the main loop through to its end (Fig. 33). This is done by the fact that the from the fabric up to the catch hook P hanging main loop in an oblique direction upwards with their both legs around the hook guide I so that the needle goes through it, creating a loop around the individual legs of the main loop through the remaining secondary loops happens. Until then, the main loop was separated from the secondary loops just simply embraced. Once at the top, the lever p1 ° of the catch hook P pushes with it its rear end p15 against resistance i13 (Fig. 21), causing the release hook i11, pulled down by its connection with lever p1 °, the hook part p5 of the Filling hook P and triggered the end of the main loop will, which slides off the catch hook P (Fig.2i). The end of the main loop wraps around the part of the hook guide I (Fig.3o and 3i) which runs out towards the opened tube Catch hook P, pulled through band r3, runs back into its starting position. The brake pad r $ is set by the brake wheel r, which is also turning back again into the incision r ', and lever r14 returns to the initial position (Figures 18 and 32). As already mentioned, the needle goes through the one to the opened tube outgoing part of the hook guide I and thus through the end loop. Of the Round gripper H pulls out a new loop (Fig. 32). This is dated in the initial position standing catch hook P caught as a new main loop by pulling the thread lever the sewing machine brought to the level of the springs i1 and i9 (Fig. a2, 27, 28 and 2g) and fixed there in the manner explained by brake wheel r. Now the knife pulls the end of the previous main loop connected to the new one from Hook guide tube from, and the explained operation is repeated continuously all over again.

Claims (7)

PATENT CLAIMS: i. -Sewing machine for making a single thread seam, in which in succession a long drawn out main thread loop with from the same Thread formed secondary thread loops is wrapped like a lockstitch, characterized by that the loop conductor and the necessary interception, switching and voltage means are arranged on a capsule in such a way that this sewing capsule instead of the bobbin case used in the hook of a standard lockstitch circular rapier sewing machine can be. 2. Sewing machine according to claim i, characterized in that on the Cover (G) of the capsule housing (g2) a loop hook guide serving as a loop conductor (1) is attached, the upper part of which is bent towards the opened tube and is inserted into the needle hole of the needle plate (D). 3. Sewing machine according to claim i and 2, characterized in that the locking closure (F) attached to the cover (G) for the capsule has a spring (f) which is screwed to the cover (G) by a bar (f2), while it is held movably under another bar (f3) and is pushed back by the edges (f4 and f, 1) of a lever (f l) when it is raised. d .. Sewing machine according to claims i to 3, characterized in that by turning the Axis (k) of a gear (k1) via a gear (k3) and brake ratchet wheel (1a4) a pin (1z ') on a spiral spring (O) has a tensing or relaxing effect is output, which is through a pin (r2) on a brake wheel (r) and a roll of tape (r1) transfers with tape (r3), whereby the lower thread tension is regulated. 5. Sewing machine according to claims i to .4, characterized in that the tape (rs) through a tape guide (S) passing through, with one running in the hook guide (1) The catch hook (P) is connected by rubbing (r1 'and p2). 6. Sewing machine according to claim i to 5, characterized in that the hook guide (1) consists of three guide parts (ilo, ill and i12), in the middle part (i11) of the catch hook (P) with Guide rollers (p1 and p3) running, with this middle part (i11) having a strong trailing edge the inside of the capsule has a bent end, in which the catch hook (P) is in the initial position with its lower roller (p1) and with its hook part (p5) far above the Edge of the upper guide part (il ') protrudes ready to be caught. 7. Sewing machine after Claim i to 6, characterized in that the catch hook (P) after catching the The main loop in the hook guide (I) disappears and, through a brake block (r $) braked, on springs (i8 and i ') through the thread of the main loop lying around the hook part (p5). B. Sewing machine according to claims i to 7, characterized in that the under pressure one Spring (r ') in a notch (r6) of the brake wheel (r) brake pad (r1) creates a braking effect necessary when pulling out the main loops, which over the tape roll (r1) and the tape (r3) are transferred to the catch hook (P). G. sewing machine according to claims i to 8, characterized in that a rotatably fastened lever (r14) engages with a bend (r13) in the handle-shaped part of the spring (r ') and through which the first secondary loop following each main loop is turned over, whereby the brake pad (r8) is lifted out of the incision (Fe) and an in a hole in the brake pad (y8) located pin (r2) by a spring (r11) pushed forward halfway, prevents the brake block (r8) again sinks back into the incision (r6) so that the Brake wheel (r) can rotate freely. zo. Sewing machine according to claims r to g, characterized in that that the catch hook (P) running in the hook guide (I) _ with .dem rear end (p ") of a lever connected to it (pio), pushing against a stop (all), a release hook (p11) through the lever (p1 °) pushes down, causing the Filled in the hook part (pl) of the catch hook and released the end of the main loop will.