CH711585B1 - Shuttle embroidery machine with single needle guides. - Google Patents

Abstract

Shuttle embroidery machine with a number of embroidery needles (1) guided in needle carriers (3) and driven to oscillate in the longitudinal direction, the guidance and storage of each individual needle carrier (3) taking place in a single, separate guide block (10) that can be exchanged for each embroidery needle (1) , which is attached to the front of the fabric in a machine-side bearing rail (7).

Description

The invention relates to a shuttle embroidery machine with a needle guide according to the preamble of claim 1.

In shuttle embroidery machines, the needle guide is a central element, as it directly affects the accuracy of the embroidery on the one hand, and on the other hand, due to the ever increasing speeds, the guide or storage is subject to ever increasing wear and should therefore be replaced with minimal effort . These two main requirements for a needle guide are to be solved with this concept. On the one hand, the needle guide is positioned with the utmost precision without tools such as gauges, dial gauges, etc., on the other hand, a single needle guide can be replaced in a very short time.

In today's embroidery machines (Saurer Pentamat) several needle guides are combined in a bearing rail, in addition, the drill guide is also integrated in this bearing rail.

[0004] This has the consequence that even when a single needle is exchanged, several needle guides and also several drill guides have to be replaced instead, although these may not show any wear and thus would not have to be replaced. Exchanging individual guide bushes is also very time-consuming, since the entire bearing rail has to be removed from the embroidery machine, disassembled, replaced, reassembled and finally aligned and mounted again in the embroidery machine.

Competitors use what is known as a plunger bearing, in which twelve needle and twelve drill guides are combined in a single block and can only be exchanged together as a module.

The invention is therefore based on the object of developing a shuttle embroidery machine with a needle guide of the type mentioned at the outset in such a way that a more cost-effective and quick replacement is guaranteed even when a single needle guide is worn.

To solve the problem, the invention is characterized by the technical teaching of claim 1.

The feature of the invention is according to claim 1 and claim 2 that the needle carriers are received individually or in pairs in guide blocks which are each detachably and interchangeably attached to the machine.

With the technical teaching of the invention, a single needle guide or a needle carrier can thus be exchanged. It is therefore sufficient that only the defective component is replaced and not several needle guides, even if these are not defective. The assigned drill guides remain untouched. Due to the shape-related positioning of the individual guide blocks with the individually arranged needle guides on a bearing rail with repeatable positioning notches, no alignment work is necessary, the needle guide is always precisely positioned. A needle guide can be replaced directly on the embroidery machine, as a maximum local cover plates must be removed, further dismantling is not necessary, which results in massive time savings.

The invention accordingly shows the following advantages over the prior art: <tb> - <SEP> The guidance and storage of each individual needle carrier takes place in a single guide block that is separate for each needle. <tb> - <SEP> Only the guidance and storage of the needle carrier is integrated in the guide block and no other functional parts such as drills. <tb> - <SEP> Since each individual needle guide is positioned on the guide block in a form-related manner, the assembly or alignment effort is minimal and incorrect adjustment is therefore excluded. <tb> - <SEP> Since only a single needle guide has to be replaced in the respective guide block, the replacement part costs are minimal. <tb> - <SEP> Since the exchange can take place directly in the machine, the downtime of the shuttle embroidery machine is minimal.

With the given technical teaching there is the advantage that a quick replacement of each individual guide block on the machine-side bearing rail is possible because each embroidery needle is assigned a needle carrier, and the needle carrier is held in a separate guide block, which is preferably in the Type of a positionally precise form-fit connection and preferably in the manner of a releasable, form-fit suspension connection is fastened on a bearing rail fastened to the machine.

While the subject matter of independent claim 1 provides that each embroidery needle is assigned a separate needle carrier and this needle carrier is received in a separate guide block, the subject matter of independent claim 2 provides that two needle carriers are included in a guide block. Thus, when such a guide block is exchanged, the two needle carriers lying next to one another are exchanged at the same time.

This has been found to be useful, because experience has shown that if a needle carrier is damaged, flying chips can arise in the course of this damage, which may be entered into the other, neighboring needle carrier and lead to damage to the adjacent needle carrier .

For this reason it has been found to be useful to combine the needle carriers in pairs in an interchangeable guide block according to the technical teaching of independent claim 2 and to make the guide block with the needle carriers arranged there in pairs interchangeable.

Thus, the invention relates not only to a single, replaceable guide block with a single needle carrier arranged thereon (claim 1), but also to a guide block on which the needle carriers are arranged in pairs next to each other (claim 2).

In addition, in a further development, the invention provides that further functional parts are fixedly and / or exchangeably arranged on the exchangeable guide block. Such functional parts are e.g. Drills and / or cutting devices and / or embossing devices and the like. More.

The machine-side bearing rail is preferably designed as a circumferentially closed rectangular hollow profile and extends over twelve needles. A separate guide block is assigned to each needle, so that in this embodiment all twelve guide blocks with assigned needle carriers are attached to the bearing rail independently of one another in a precisely fitting form-fit connection. As a preferred embodiment of such a form-fit connection, a releasable form-fit suspension connection is preferred because such suspension connections are positioned individually on the bearing rail and are easily exchangeable.

In a preferred embodiment of the invention, the releasable form-fitting suspension connection consists of a hook-like suspension connection, which is preferably a form-fitting connection and which solidifies and clamps itself during assembly. It is therefore a wedge connection that forms two interlocking inclined surfaces in the manner of a hook-in connection, so that the opposite side of the guide block can be hooked into this bearing rail with a form-fit connection with simultaneous clamping while the fastening is being tightened on the side of the inclined surfaces.

The side of the detachable, interlocking suspension connection opposite the wedge connection is formed by various embodiments, the preferred embodiment being that on the holding plate of the guide block a forward guide bevel is arranged in the region of a guide projection, which is attached to a guide rib in the same direction the top of the guide block rests, the two slopes being displaceable relative to one another.

This describes a self-solidifying, detachable, form-fitting suspension connection, because when the guide block is screwed onto the machine-side bearing rail, the two aforementioned bevels slide along one another on the side remote from the needle and so the guide block against its suspension connection formed on the opposite side move and solidify this.

This provides a backlash-free form-fitting suspension connection which, however, can also be implemented in other embodiments.

In another embodiment of the invention it is provided that on the side of the guide block remote from the needle, instead of the bevels lying against one another, simple hook-in connections are provided.

In the following, the invention is explained in more detail with reference to drawings showing only one embodiment. Further features and advantages of the invention that are essential to the invention emerge from the drawings and their description.

[0024] They show: <tb> <SEP> Figure 1: a schematic side view of a needle guide of a shuttle embroidery machine <tb> <SEP> FIG. 2: an enlarged view of the representation in FIG. 1 with the representation of further details <tb> <SEP> Figure 3: a section through the needle-side guide block <tb> <SEP> Figure 4: the perspective view of the guide block <tb> <SEP> Figure 5: the side view of the guide block <tb> <SEP> Figure 6: the top view of the guide block <tb> <SEP> Figure 7: the front view of the guide block <tb> <SEP> Figure 8: perspective of the holder of a guide block on a machine-side bearing rail <tb> <SEP> Figure 9: the basic diagram of the bearing according to Figure 8 <tb> <SEP> Figure 10: a form-fitting hook-in connection that is modified compared to Figure 9 <tb> <SEP> FIG. 11: a third embodiment of a form-fitting suspension connection <tb> <SEP> Figure 12: a fourth embodiment of a form-fitting suspension connection

In Figure 1, an embroidery needle 1 is held exchangeably in a needle clamp 4 on the front of a needle carrier 3; the needle thread 2 is fed diagonally from above and behind.

Below the embroidery needle 1, a drill 5 is arranged in a manner known per se, which is held in a drill holder 6, and the two parts mentioned are held in a bearing rail 7 on the machine side.

For the sake of simplicity of the description, the following description assumes that the embroidery needle 1 is held according to the invention in a guide block 10 that is exchangeably held on the bearing rail 7.

The same holder that is provided for the embroidery needle 1 could, however, also be provided for the drill 5 with its drill holder 6.

However, since the drills 5 have to be replaced much less frequently compared to the embroidery needles, a replaceable holder for the drill 5 is only described in such a way that individual drills 5 with their drill holder 6 are received together in the machine-side bearing rail 7.

The bearing rail 7 is held interchangeably via a bracket 20 in a further longitudinal member 8, for reasons of simplicity in the context of the description of the drawings only the positive suspension connection 60 between the needle-side guide block 10 and the machine-side bearing rail 7 is described in more detail.

The drill holder 6 is connected to a drill carrier 9, which is connected to a drill drive shaft 11 via two pivot bearings in a manner known per se.

The same applies to the drive of the embroidery needle 1. Via a needle drive shaft 12 and two hinge points 13, 14 a longitudinally displaceable guide of the needle carrier 3 is given, which is driven to oscillate in the guide block 10 in the longitudinal direction.

The thread run is covered at the bottom by a cover plate 15, and the needle thread 2 runs in a manner known per se over a thread monitor 16, behind which a thread guide 17 is arranged. The entire rear module is referred to as thread delivery 18.

The oscillating longitudinal displacement of the needle carrier 3 is generated via the aforementioned articulation points 13, 14 and a pivotably driven needle pawl 21.

The same applies to the oscillating drive of the drill 5 via the drill pawl 22.

In Figure 2, the suspension connection 60 according to the invention is indicated schematically, which is arranged between the bottom of the guide block 10 and the top of the machine-side bearing rail 7.

Further details of the guide block 10 can be taken from FIG.

On its front side, the needle carrier 3 carries a carrier tube 25 which is connected to the front end of the tubular needle carrier 3 by a welded connection. A holder 69 for the needle clamp 4 is provided on the carrier tube 25. If the needle carrier 3 is to be exchanged, it is pulled backwards from its guide out of the guide block 10, the needle clamp 4 being removed.

The longitudinal guidance of the needle carrier 3 in the guide block 10 is carried out by two spaced apart guide bushes 23, 24 which are designed as metal sliding bushes.

In order to avoid undesired rotation of the needle carrier 3 in the guide receptacle of the guide block 10, a longitudinal guide 28 is provided which centers the needle carrier 3 in the (axial) longitudinal direction relative to the guide block 10 in a manner secured against rotation.

Accordingly, the needle carrier 3 is driven to oscillate in the directions of the arrows 27 and slides in the guide bushes 23, 24.

The illustrated spiral spring 26 holds the needle pawl 21 in a certain basic position.

Further details of the needle-side guide block 10 can be found in FIGS.

It consists essentially of two spaced guide beams 32, 33, which are connected on their upper side by a longitudinal beam 30, under which a free space 29 is formed.

In the rear guide support 33, the guide bush 23 is arranged, while the front guide bush 24 is arranged in the front guide support 32.

The overall continuous base plate 31 is functionally divided into two sub-plates. It consists of a rear, narrower extension plate 40 and of a widened, front retaining plate 39, in the front region of which the suspension connection 60 according to the invention is arranged.

The guide block 10 is fastened to the upper side of the bearing rail 7 via screw-on bores 41 and fastening screws extending through them. This emerges from FIG. 8, where the fastening bores 51 are shown on the fastening surface 49 on the upper side of the bearing rail 7.

After the needle thread 2 is fed parallel to the longitudinal member 30, it first runs past a beveled thread guide 35, and then runs into the funnel-shaped, upwardly half-open thread path 34, which is bounded laterally by inclined surfaces 36, which the Center the thread on the base 37 of the thread run 34.

The thread run 34 is formed in the top surface 38 in the area of the front guide support 32.

According to FIGS. 4 and 5, the needle-side suspension connection on the guide block 10 consists essentially of a guide projection 43 which projects obliquely to the front and which forms an obliquely extending stop edge 54.

A centering nose 42 is provided above this stop edge.

The part of the interlocking suspension connection remote from the needle is formed in the embodiment shown from a guide bevel 52 on the rear face of the holding plate 39, the guide bevel 52 also being formed on the opposite side.

In FIG. 7 it can be seen that the centering lug 42 is arranged centrally on the end face of the guide block 10, and the two guide lugs 43 are arranged in alignment on the holding plate 39 at a mutual distance from one another.

FIG. 8 schematically shows the mounting of a guide block 10 on the upper side of the bearing rail 7, while FIG. 9 shows the section through this fastening.

The hook-in connection close to the needles consists of a rearwardly directed guide extension 43 on the guide block 10, each guide block 10 being assigned its own hook extension 44 on the upper side of the bearing rail 7.

The hook attachments 44 are arranged parallel to one another and are separated from one another by centering notches 45.

The respective centering lug 42 on the front face of the guide block 10 then engages positively in the centering notch 45 between the hook attachment 44 and centers itself there with an accurate fit.

To the left and right of the respective centering notch 45, the lateral hook lugs 44 are formed, and each hook lug 44 engages both the left and right guide lugs 43 on the front face of the guide block 10 in the region of the retaining plate 39.

In the exemplary embodiment shown, the rear suspension connection remote from the needle is formed from guide ribs 47 projecting obliquely upward, between which clearances 48 are arranged.

The guide ribs 47 on the rail side engage with associated guide bevels 52 on the guide ribs 47, which have the same bevel, so that when the guide block 10 is mounted on the mounting surface 49 of the bearing rail 7, the parts are longitudinally displaced in the longitudinal direction (arrow direction 53) , and the form-fitting suspension connection is automatically solidified during assembly in the direction of the hook connection 43, 44 next to the needle.

The screwing takes place - as previously shown - by fastening screws, not shown in detail, which reach through the screw-on bores 41 in the base plate 31 and into which the threaded fastening bores 51 of the bearing rail 7 are screwed.

The lower fastening surface 50 of the bearing rail 7 is used to screw the bearing rail 7 onto the upper side of the longitudinal support 8 on the machine side.

It can also be seen from FIG. 8 that the drill supports 9 are held exchangeably in assigned guides 46 on the front end face of the bearing rail 7.

FIG. 9 shows the first embodiment of the self-solidifying form-fitting suspension connection 60a, in which - as described - a rail-side, rearwardly directed hook attachment 44 is pushed onto an associated centric centering nose 42.

In addition, the suspension connection 60a is also formed by the two lateral guide lugs 43, which are pushed under the hook lug 44 and solidify in the process.

In addition to the first embodiment of a form-fitting suspension connection 60a shown in FIG. 9, a second embodiment of a suspension connection 60b is described in FIG. 10, which essentially consists of two snap hooks 55, 56 which are arranged on the underside of the guide block 10 and which are connected by associated longitudinal slots 57 Reach through on the top of the bearing rail 7 and place yourself there with lateral stop edges 58 on the underside of the fastening surface 49.

In order to facilitate the insertion of the snap hooks 55, 56, they are each provided with associated insertion bevels 59 on the bottom side.

FIG. 11 shows a third embodiment of a suspension connection 60c.

This suspension connection 60c consists essentially of two oppositely directed hooks 61, the hook 61 closest to the needle being able to be suspended in an associated suspension groove 62 on the underside of the guide block 10, while the hook 61 remote from the needle rests against an associated stop 63.

It goes without saying that such a stop 63 can also form a self-solidifying connection if this stop 63 is designed as a clamping eccentric or as a screw eccentric.

As a fourth embodiment, FIG. 12 shows a suspension connection 60d that the same suspension connection 60a, as according to FIG. 9, is proposed on the side near the needle, but that a clamping eccentric 64 is arranged on the side remote from the needle, which is in a pivot bearing 67 on the guide block is held pivotable. A clamping eccentric 64 is arranged on the eccentric lever 65 in a rotationally fixed manner, so that when the eccentric lever 65 is pivoted about the pivot bearing 67, pressure is applied to a pressure piece 66 and the part of the guide block 10 remote from the needle is thus pressed onto the upper side of the bearing rail 7, with a counterpart 68 is used.

Of course, it is also possible to swap the arrangement with the clamping eccentric so that the clamping eccentric 64 is not arranged on the guide block 10, but in the area of the bearing rail 7, and the entire structure is functionally interchanged in this way.

Incidentally, this also applies to all of the other exemplary embodiments described.

Thus, all of the above-mentioned exemplary embodiments with suspension connections 60 a-d can also be arranged in an equivalent reversal instead of on the underside of the guide block 10 on the upper side of the bearing rail 7 on the machine side.

Drawing legend

1 embroidery needle 2 needle thread 3 needle carrier 4 needle clamp 5 drill 6 drill holder 7 bearing rail 8 longitudinal carrier 9 drill carrier 10 guide block 11 drill drive shaft 12 needle drive shaft 13 joint 14 joint 15 cover plate 16 thread monitor 17 thread guide 18 thread delivery 19 20 bracket (for 7) 21 needle pawl 22 drill pawl 23 Guide bushing (rear) 24 Guide bushing (front) 25 Support tube 26 Spiral spring 27 Direction of arrow 28 Longitudinal guide 29 Free space 30 Longitudinal support 31 Base plate 32 Guide support (front) 33 Guide support (rear) 34 Thread path 35 Thread guide 36 Inclined surface 37 Base (of 34) 38 Top surface 39 Retaining plate 40 Extension plate 41 Screw hole 42 Centering nose 43 Guide extension 44 Hook extension 45 Centering notch 46 Guide (for 9) 47 Guide rib 48 Release (from 47) 49 Mounting surface (top) 50 Mounting surface (bottom) 51 Mounting hole 52 Guide slope 53 Direction of arrow 54 Stop edge 55 Snap hook 56 Snap hook 57 Longitudinal slot 58 A stop edge 59 lead-in bevel 60 hook connection a, b, c, d 61 hook 62 hooking groove 63 stop 64 clamping eccentric 65 eccentric lever 66 pressure piece 67 pivot bearing 68 counterpart 69 bracket (for 4)

Claims (10)

1. Shuttle embroidery machine with a number of embroidery needles (1) guided in needle carriers (3) and driven to oscillate in the longitudinal direction, characterized in that the guidance and storage of each individual needle carrier (3) in a single, separate guide block which can be exchanged for each embroidery needle (1) (10), which is attached to the front of the fabric in a machine-side bearing rail (7). 2. Shuttle embroidery machine with a number of embroidery needles (1) guided in needle carriers (3) and driven to oscillate in the longitudinal direction, characterized in that the guidance and storage of two adjacent needle carriers (3) in a separate guide block which can be exchanged for two embroidery needles (1) (10), which is fastened on the front side of the fabric in a machine-side bearing rail (7). 3. Shuttle embroidery machine according to claim 1, characterized in that each needle carrier (3) of each embroidery needle (1) is received in the separate guide block (10) which is each detachably and interchangeably fastened to the machine-side bearing rail (7) with a form-fitting and precisely fitting connection . 4. Shuttle embroidery machine according to claim 2, characterized in that the two adjacent needle carriers (3) of two embroidery needles (1) are accommodated in the separate guide block (10), each of which is detachable and interchangeable with a form-fitting and precisely fitting connection on the machine-side bearing rail (7). is attached. 5. Shuttle embroidery machine according to one of claims 1 to 4, characterized in that only the guidance and storage of the one or two needle carriers (3) is integrated in the respective separate guide block (10) and no further functional parts, such as drills (5). 6. Shuttle embroidery machine according to one of claims 1 to 4, characterized in that the guidance and storage of the one or two needle carriers (3) in each separate guide block (10) is equipped with further functional parts, such as drills (5) and / or cutting devices 7. Shuttle embroidery machine according to one of claims 3 to 6, characterized in that the form-fitting, precisely fitting and releasable connection between the needle-side guide block (10) and the machine-side bearing rail (7) consists of a suspension connection (60a-d) between the guide block (10) and the There is a bearing rail (7) which is located on that side of the guide block on which the needles are attached to the needle carrier or carriers. 8. Shuttle embroidery machine according to claim 7, characterized in that the suspension connection (60a-d) between the guide block (10) and the bearing rail (7) consists of a wedge connection (42, 43, 44, 45) which centers itself during assembly. 9. Shuttle embroidery machine according to claim 8, characterized in that the suspension connection (60a-d) between the guide block (10) and the bearing rail (7) is tensioned with a pretensioning force when the guide block (10) is mounted on the bearing rail (7). 10. Shuttle embroidery machine according to one of claims 7 to 9, characterized in that the connection between the bearing rail (7) and the guide block (10) lying thereon opposite the suspension connection is formed from a guide bevel (52) which is flat and in the direction of the suspension connection falls, the two parallel bevels (47, 52) of the bearing rail (7) and the guide block (10) perform a relative movement when the guide block (10) is mounted on the bearing rail (7) and the guide block (10) against its suspension connection ( 60a-d) press.