DE1804482A1 - Sewing machine - Google Patents

Description

Patent attorneys Dipl.-Ing. F. Weickmann,

Dipl.-Ing. H.Weickmann, Dipl.-Phys. Dr K. Fincke D1PL.-ING. F. A-Weickmann, Dipl.-Chem. B. Huber

KOBM S MUNICH 27, DEN MÖHLSTRASSE 22, CALL NUMBER 483921/22

AMERICAIf MAGHIUE & POUIiDRY COMPANY, 261 Madison Avenue,

Hew York. HY 10016, V.St.A. {

sewing machine

The present invention relates to improvements in sewing machines, and more particularly to improvements in one Sewing machine according to that in the German patent specification

No. (German patent application No. P 17 60495.4)

described sewing machine.

In this German patent, a blind stitch sewing machine is described, comprising two opposing, vibrating needle clamps and a curved needle which, while sewing, between the two needle clamping devices is guided back and forth. The first needle chuck drives the needle through the seam or seam bead of the sewing material and pushes it into the second needle clamping device a. After it has been picked up, this pulls the needle through the sewing material until the needle is complete has been pulled through the seam.

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Then the second Nadeleinspannvorrielitung goes back a little, so that the two loops of the thread formed between the 'eye of the needle and the seam are loosened somewhat. Then the needle guide mechanism or head is raised a little to lift the needle from the material so that it can be returned (over the seam) to the first needle clamping device for another stitch. Before the needle is returned to the first needle clamping device, a slinging device detects the free-ended thread section of the thread, expands it and feeds it to a thread puller. This thread puller pulls the loose thread end completely through the seam of the sewing material. In other words: the mower simulates a hand seam by first leading the needle with the thread completely through the sewing material, then pulling the loose end of the thread right through the sewing material and finally bringing the needle with the thread back into a position in which it is ready for a new stitch. In the case of a hand seam, the thread is pulled completely through the sewing material by simultaneously leading the needle far away from the sewing material. In one machine, this is done by holding the needle in the second needle clamping device after it has been pulled out of the sewing material, and then pulling the loose thread end through the sewing material using a thread gripper and thread puller. Otherwise, the succession of the different operations similarly to the embodiment ^ _& uirun a HaudnaLt, and; the sewing result is of the same quality and quality.

In the German patent mentioned above is a A needle guide is provided which securely guides the curved needle from the first needle chuck here, through the seam in the sewing material and then supported in the second needle clamping device.

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A task of machine sewing versus hand sewing is to stejgprn the sewing performance without increasing costs or loss of quality, and one of the occurring Problems are that with increasing sewing speed, needle breakages and pad tears occur. It is understandable and necessary that after each stitch the two formed between the eye of the needle and the seam Thread sections are separated and that at least the section closer to the thread end loosened and in one suitable position is brought so that it can capture a loop pattern and pass it on to a thread puller. During these work or sewing steps, especially during the transition from the actual stitch to looping and threading, the thread path is suddenly changed, and the thread becomes violent and sudden Exposed to loads that can lead to thread breakage.

The object of the present invention is to provide a new combination of an overhead needle guide and a thread divider and a guiding device suggests which needle breaks and thread tears at high sewing speeds prevented or at least greatly reduced. This door direction works according to the invention in the manner described below together with the needle guide specified in the above German patent specification line Another object of the invention is, in the above-mentioned new combination, a stitch control and -Specify an adjustment option that enables a constant sewing quality for a large number of stitches guarantee.

The starting points of the invention can also be defined as a sewing machine, especially blind stitch sewing machine, bei.der a curved cone along a curved Guide profile in a lower I needle guide

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member is passed through the material to be sewn. The real one The invention consists in the fact that it has an overhead cooperating with the guide member located below Has thread guide with a counter-guide profile, and that this counter-guide profile with the guide profile defines a bottom, wall and ceiling side closed guide channel, which at both ends for the Passage of the needle is open.

Further details and features of the invention emerge from the following description in conjunction with the accompanying drawings. The drawings show:

Fig. 1 shows part of a sewing machine with the features according to the present invention, wherein '' the individual parts are in the position at the beginning of a stitch.

Fig. 2 is a view similar to FIG. 1 and shows the individual parts in a position in which the needle with the thread has been pulled through the material to be sewn.

3 is a plan view of the part of the sewing machine according to FIGS. 1 and 2.

FIG. 4 is a view of the mechanism shown in FIG. 3 from the right side.

FIG. 5 is an exploded perspective view of the device according to FIG Invention.

Fig. 6 is a view of the stitch control insert according to '■ the invention from below.

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: ■■ ".S piiiir: r

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In the present description, only those parts of the German patent mentioned at the outset are included mentioned which are necessary to understand the improvements proposed by the invention. For one a more detailed description of the working mode of the sewing machine can be found in the above-mentioned German patent specification referenced.

As shown in the drawings, the sewing machine according to the aforementioned German patent a first needle clamping device IO and a second needle clamping device 11, which for a Oscillating movement are rotatably mounted about a horizontal axis 12. A curved needle 13 with a needle eye 13 'is moved back and forth between the two bathing jigs 10 and 11 to form the stitches thrown. In Fig. 1, the needle 13 is held by the first needle clamping device 10 and by an in the sewing bead 14 formed on the material 15 is guided. The sewing material 15, which consists of two to be connected by a blind stitch Layers is between a fixed upper pressure plate 16 and a movable one lower pressure plate 17 arranged. The bead 14 is J formed by a plunger 18, which is to a given Point in time through an opening formed in the lower pressure plate 17, not shown, against the material to be sewn 15 comes to the plant.

A single thread is passed through the eye of the needle 13 ^f. The thread section 19 further away from the free thread end extends between the eye of the needle 13 'and the stitch last formed in the sewing material, while the thread section 20 closer to the loose thread end forms the loose thread end itself, as shown in FIG. 1, the needle laughs 13 to the second needle tensioning

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Device 11 has been released, the needle is released from the first needle clamping device IO and continued by the second needle clamping device 11 into the position shown in FIG. 2, in which the The needle has been passed completely through the material to be sewn. In this position the thread section forms 19 a so-called near-seam loop 19 ', while the loose thread end 20 is a thread loop closer to the loose thread end 20 ', with both the loops running between the seam in the sewing material and the eye of the needle 13', where they merge because they are parts of a single short thread, which is in this way Mowers is used.

As shown in FIG. 3, the upper pressure plate 16 is essentially square and one of its diagonal axes is aligned parallel to the oscillation axis 12. At one end it has an incision 21, and the direction of the feed of the sewing material is indicated by the arrow 22. The upper Dyu ^^ l ^ .i {- Ιβ is part of the needle guide described in the above-mentioned German patent, or, to be more precise, the needle guide is formed as an integral part of the surface of the upper pressure plate 16. It surrounds a substantially Γ-shaped Ketal member 23, which with an opening 24 engages around a central opening 25 in the plate 16. The incision 21 opens into this opening 25. The opposite ends of the legs of the U-shaped metal member 23 have left and right grooves 26 and 27, respectively. These grooves 26 and 27 are aligned with one another along a line which is directed perpendicular to the axis of oscillation 12 of the needle chucks. The grooves 26 and 27 have opposite side walls 26 ", 26" and 27% 27 ". Your floor surfaces and side walls

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form a bottom-side and wall-side support and guidance for the curved needle 13 which passes through that sewing material 15 along an arc 28 (Pig. 5) to be led.

In accordance with the present invention, an overhead mount and guide for the curved needle is provided. The overhead holder and guide for the needle has a metal member 29. This metal link 29 comprises a substantially square centrally depending rope 30, an upper mounting flange 31 f and also front and rear wings 32 and 33, all of which are formed from a single piece are. In the assembled state, the overhead holder and guide 29 for the needle engages with their Wings 32 and 33 in the grooves 27 and 26 of the thread guide 23 below. The lower limit channels the wings 32 and 33 are aligned along an arc similar to the arc of curvature of the needle 13. They are at a certain distance from the bottoms of the grooves 27 and 26, thus forming a needle guide channel 34 and 35, which runs along the arc 28 and is substantially closed, with the exception of the respective two ends, so that the needle 13 at any time * during its stroke from left to right in the sense of Fig. 1 and 2 is securely guided and supported. In this way the needle is not given sideways from its predetermined position Lifting path bent out · As the needle approaches the seam bead 14, its point is in the rear Guide channel 35 out, and while the needle leaves the seam bead 14-, its trailing end is through the front guide channel 34 out. In this way it is impossible for the needle to reach a predetermined puncture point missed or unexpectedly hits an obstacle, deflected or broken off.

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The front wing 32 also has the task of the near-seam loop 19 ^f and loop 20 *

at the loose end (see FIG. 2), the loop 19 near the seam running behind the wing 32 in the sense of FIG. 2, while the thread loop 20 runs in front of the wing 32. When the needle 13 is passed through the sewing material 15 from left to right, the eye of the needle 13 ^f reaches a raised position. Since the needle 13 is guided along the lower boundary edge of the wings 32 and 33, when the eye of the needle 13 is raised, the thread sections 19 and 20 (FIG. 1) are automatically passed through the front wing 32 into the loops 19 ^! and 20 · (see Fig. 2).

The front wing 32 is connected to the central part 30 ⁿ by inclined or conical surfaces for rolling or sliding off the thread, so that thread breaks due to sharp tensile loads or changes in direction are avoided. As shown in Fig. 4, the wing 32 is connected on its left side to the central part 30 by tapered or tapered surfaces 36, 37, while on its right side it is connected to the central cable 30 and to the flange 31 lying above inclined or conical surfaces 38 to 41 inclusive · is connected. The areas 36 and 37 are important during the loop formation mentioned above and during the pulling of the thread. During these work steps, a loop pattern (not shown) swings from right to left in the direction of the pig. 2. It grasps the thread loop 20 '. at the loose end of the thread in order to expand it and place it on thread pullers (not shown), which then pull the loose end of the thread completely through the material to be sewn.

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The SCH ₄ Ii ngenbilder the solos over leads 20 'at the loose end of the thread from the right to the left in a position which with respect to the position of the loop 20' in FIG. 2, let raised. This causes a sudden tensile load and change of direction, and the surfaces 36 and 37 essentially prevent thread breakage by forming draining and sliding pools with reduced wear.

Surfaces 36 to 39 are also important for the transition of the individual machine parts from the position shown in Fig. 1 in the / Sig. 2 shown te position because the thread from a first in wesent union horizontal direction in about 45 ° inclined direction passes, and experiences a substantially constant tensile load. There ^ eder When sewing a garment, short thread used multiple stitch movements, looping and experiences pulling movements before the garment is finished, it is understandable that you have to reduce the wear of the thread to a minimum if the cutting performance of the machine without Thread breaks should be increased. A Padenriß means an unclean stitch and brings plumbing times the machine with it, resulting in a decrease in nutrient performance leads. This also applies to Badelbruch, which also leads to an increase in Koeten, because the ' Needles need to be replaced.

The surfaces 40 and 41 essentially form Cutouts for a free fiaum for one not shown clamping finger. Whenever the machine is working the üadeleineyannvori-iolitung 11 after you

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has pulled the needle 13 out of the sewing bead 14, moved back slightly in order to loosen the loops 19 · and 20 · a little. The clamping fingers are provided for the cutouts 40 and 41 helps _t the loop 19 * restrain, so that this detected by a not shown thread gripper and can be held so that the 20 "train exerted by the looper to the loop not to the Seam is transferred and leads to a distortion of the seam. This thread pictures is not the subject of the present invention and is in the German

Patent Jir. · · · (German patent application

No. · ... ·. ·).

As shown in FIG. 5, the central part 30 of the overhead needle holder and guide 29 has a downwardly open slot 42. This slot 42 is designed to receive an insert 43 for controlling and setting the stitch. The insert 45 is held in place by a screw 44 which engages in bores 45 and 46 in the upper parts of the components 30 and 43. The insert 43 is held releasably so that an insert similar to the insert, but with different characteristics, can be inserted into the slot in order to produce a different stitch configuration or a different stitching feature. In practice, the insert 43 is approximately half the size of the insert shown in FIG. In this way there is a setting option in which only _; a very small part of the entire facility is replaced. If one looks at FIG. 5 from the left, one finds that the lower side edges of the insert 43 are provided with convex grooves 47 running in the transverse direction. In the sense of Fig. 4 and viewed from the front or from the right, the ühterkan-

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te of the insert 43 ait a pair of spaced rounded rabbits 58 is provided between which a recess 49 is located. The recesses 49 are aligned with the wings 32 and 33, and the Lugs 48 are arranged along the opposite sides of the needle 13 as it is passed through the guide channels 35 and 34. These parts 48 and 49 serve to further guide and hold the needle 13,

As shown in Fig. 6, files 47, 48 and 49 surround a cavity 43 'on the underside of the J.

Insert 43. The SrOSe and shape of the hollow 43 ^f determine the type of penetration of the needle 13 in the seam bead 14 determined, which in turn determines the length and depth of the stitch in the fabric. At its upper end, the plunger 18 has a notch 18 which is aligned with the arc of curvature 28. The ram is raised by a drive described in the above-mentioned German patent specification at a predetermined time in order to press the material 15 into the cavity 43 * and so f

to form the seam bead 14. The needle 13 is then guided through the "hewn material 15 along the circular arc 28, following the path defined by channels 35 and 34t, indentations 49 and notch 18 '.

When you adjust the width or length of the stitch

want or the piercing of the curved needle through I. the material to be sewn, then it is sufficient to push the insert 43 through to replace another suitable insert by the screw 44 is loosened in a simple catfish. Ss is understandable that the quality of the finished stitch

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is also determined by the ability of the machine to always produce the same seam bead for the to form successive punctures of the needle.

According to the present invention, this is achieved in that the insert 43 has a stop or stop represents for the seam bead formed by the plunger 18. The cavity 43 'guarantees in connection with the · ! Share 47 and 48 on insert 43 »that always the same Bead start 14 is generated.

The insert releasably inserted into the slot 42 43 to control the stitches this control is available for the stitch pattern exclusively in the one above Guide and holder 29 for the needle. The element. 29 of course also serves to separate the thread, reduces pad wear to a minimum and prevents thread tears and needle breakage. The insert 43 also controls the stitch pattern with respect to it uniform goodness. The sewing machine according to the German patent mentioned at the beginning was missing one such overhead bracket and guide for the formation of the seam bead. According to the present invention this overhead support is formed by the insert 43, so that in a given insert 43 of the plunger 18 always forms a seam bead of the same shape.

The combined holder and guide for the needles 29 and 43 is attached to a holder arm 150 The outer end of the support arm 50 is in a guide rail 51 in the flange 52 of the guide 29 recorded. The guide 29 is on the support arm 50 in its inner or outer set position, held by a screw 52, which by a

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Bore ^ 53 in a clamping plate 54 protrudes and into a Threaded bore 55 engages in flange 31. The position of the guide 29 and 43 is also near the right j or adjustable to the left, namely by means of a positioning fastening for the inner end of the mounting arm 50. This is indicated by the clamping screws 56 which are shown in FIG a slot 57 of the support arm 50 (Fig. 3) are mounted.

The holding arm 50 is not one of a rope 58 shown mounting arm for the Nadeleinspann- (j devices or the sewing head 10, 11, 12 and 13 attached. As explained in more detail in the German patent mentioned at the beginning, this fastening arm causes the sewing head to be raised and lowered at a point in time coordinated with the working ryfamus of the other sewing machine parts · Before the needle 13 of of the second needle chuck 11 is returned to the first needle chuck 10 the ram 18 is lowered and the sewing head is raised. When the sewing head is raised, those are on top Needle guide 29 and the insert 43 provided therein for the stitch control are also raised, eo that they J for the backward movement of the needle 13 from the second needle clamping device 11 back into the first needle clamping device 10. If the Parts 29 and 43 are raised with the sewing head, they also lead the needle 13 on its Bückweg from the Nadeleinspannvoriohtuag 11 back into the Nadeleinspannvoriohtung 10.

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Claims (1)

Claims 1. Sewing machine, in particular blind stitch sewing machine, in which a curved needle along a curved one Guide profile in a unuer lying en load guide link is carried out through the Iiähgut, thereby characterized in that it has an overhead cooperating with the lower guide member (23) Has thread guide (29) with a saw guide profile (32,33), and that this counter-guide profile (32,33) «With the! Guide profile (26,27) defines a guide channel (35» 34) that is closed on the bottom, wall and ceiling, which is open at both ends for the passage of the needle (13), 2. Sewing machine according to claim I ₉ iadurch in that in the underlying "FUhrtmgsglied (23) an opening (23) ^ for A ^ IBV ':> χ $ a Nahtwulst (14) in the iJäfcgut _x iii) in the region of the web ( 28) of the needle (13) is provided that this opening (25) divides the guide profile formed by grooves (26 * 27) in the underlying guide member (23) into a front and back groove and that the counter-guide profile from two into the two Grooves (26,27) engaging wings (32,33) is formed, which form the guide channel (34,35) for guiding the needle (13) into, through and out of the seam bead (14). 3. Sewing machine according to claim 2, characterized in that the at least one wing (32) at the exit of the needle (13) from the overhead fafleäfUhrung (29) as a spreading member for the needle (15) through the seam-'wulst (14 ) thread sections (19 ', 2O ¹ ) potted through 009823/0698 " ¹⁵ " BATH ORIGINAL when the needle (13) emerges from the overhead thread guide (29) on one of its sides. 4 · Sewing machine according to one of Claims 2 and 3 »characterized characterized that at least on the wing (32) at the exit of the needle (13) from the overhead thread guide (29) Trerschleißaindande Sohrttgflächen (36 - 41) are formed on each side of this wing (32), the extend between the seam bead (14) and the trailing edge of the wing "(32)" 5 * Sewing machine according to one of Claims 2 to 4, characterized in that it has a guide part (45) supporting the seam bead (14) from above, comprising an insert (43) attached to the thread guide (29) at the top on its underside a iu of the web (28) of the needle (13) vertically extending cavity (43 *) "or receiving the Nahtwulst (14) and that these _β cavity (43 *) for controlling the stitch of the needle (15) through the Nlhgut (15 ) has a predetermined size and shape. 6. Sewing machine according to claim 5 »characterized in that the insert (43) is releasably mounted in a slot (42) in the overhead thread guide (29) so that in the overhead thread guide (29) several inserts (43) of different shapes and sizes for control of the stitch can be used. 7. Sewing machine according to one of claims 5 and 6, characterized characterized in that the insert (43) above the opening (25) in the guide member (23) below is arranged and that the cavity (43 *) on the underside of the insert (43) with a through the opening (25) at a given time in the work 009823/0698 - 16 - 1 044 ti * oh Ii, t ι, 'lci da ,, La ^ itL (15 J ι "ι ' ι in ti 3 C Hi ■ ( ΆΤ Ulic (M ' ■ "' t ι.-, 'L ^Ί " ·. (14) ζ «form. 009823/0698 BATH ORIGINAL