WO2008067875A1

WO2008067875A1 - Closable thread eye

Info

Publication number: WO2008067875A1
Application number: PCT/EP2007/009011
Authority: WO
Inventors: Richard Kaufmann; Markus Hermann; Michael Mixner
Original assignee: Memminger-Iro Gmbh
Priority date: 2006-12-07
Filing date: 2007-10-18
Publication date: 2008-06-12
Also published as: TW200914357A; DE102006058083A1; CN101558192A

Abstract

A thread eye (11) which can be used, for example, for thread delivery devices surrounds a thread guide opening (48). The thread eye (11) has a lateral slot. The insertion slot (47) is locked by a closing element (49) which can be transferred if desired into an open position. The closing element is preferably mounted resiliently.

Description

Lockable thread eyelet

The invention relates to a thread eyelet for a thread-guiding textile-technical device, such as a yarn feeding device, a yarn tension sensor, a thread monitor or the like.

Often it is necessary to guide thread in a predetermined way, such as on a yarn brake, a yarn tension sensor or a yarn feeder. Such a yarn feeding device serves, for example, to supply yarn in a controlled manner to a knitting point of a knitting machine or to another thread-consuming point. A yarn feeding device can be seen for example from DE-OS 27 27 604. To promote the thread, the yarn feeding device has a driven Fadenlieferrad. To the Thread controlled to lead to the yarn feed wheel and to guide the yarn controlled by the yarn feed wheel away, the yarn feeding device usually before and behind the yarn feed yarn on eyelets. This is formed in the form of a wire loop with a complete turn. The thread can be used in a looping motion in the eyelet, in which it is held relatively safe. However, at high yarn delivery speeds and strong yarn tension variations, it sometimes happens that the yarn escapes from such an eye.

There are also e.g. from DE 25 31 378 Al thread eyelets in the form of hollow cylindrical elements with outside graduated diameter known, which are inserted into a holding plate. Although a thread can not escape from such an eyelet, threading a thread requires considerable dexterity.

From DE 733394 Cl also a thread eye in the form of a flat sheet with a central thread guide hole and a radially extending away from this slot for inserting the thread is known. For closing the slot, a plate attached pivotally to the eyelet is provided, which can be pivoted over the slot and thus covers it. The plate is frictionally held in its various positions.

On this basis, it is an object of the invention to provide a thread eyelet, in particular for a yarn feeding device, with which it is possible on the one hand to thread threads in a simple convenient way and in which other threads are held securely. This object is achieved with the thread eye according to claim 1:

The thread eyelet according to the invention has a body with a thread guide opening, whose edge is interrupted by a Fadeneinführschlitz. The thread insertion slot allows easy threading of a thread. A closing element blocks the Fadeneinführschlitz, but it can release them as needed. For this purpose, it is preferably mounted in a corresponding pocket of the body, wherein it bridged in the rest position the Fadeneinführschlitz and is elastically held in its closed position. To insert the thread, it can be moved out of the Fadeneinführschlitz against spring force to release it. The arrangement of the closing element in a pocket can be ensured that it does not affect the running of the thread. Preferably, the insertion slot is arranged on one side of the thread eye on which the thread normally does not run. After thread eyelets are usually arranged at Fadenumlenkstellen, the Fadeneinführschlitz is thus preferably disposed on one side of the thread eye, which is outside the spanned by the thread angle.

Preferably, the body is made of a wear-resistant material, such as a plastic, an elastomer, an elastomer with a ceramic shield or a ceramic insert, ceramic material or it contains ceramic material. Alternatively, it may consist of or contain a cemented carbide. This ensures high wear resistance. If the body is made of a plastic or elastomer, the inherent resiliency of the material (elastomer or plastic) can be achieved by snap fastening of the body to serve on a carrier.

The body preferably surrounds the thread guide opening at an angle significantly greater than 180 °. The insertion slot thus occupies only a smaller part of the circumference of the opening. This ensures that the thread rubs primarily on the body and at most occasionally on the closure member.

The thread guide opening may be round or oval. The round embodiment is particularly suitable when the closing element is formed for example by a short wire pin. The oval embodiment of the thread guide opening is particularly recommended when the closing element is replaced by a cylindrical pin, e.g. made of ceramic, is formed. This is then preferably arranged on the straight edge of the oval thread guide opening.

The bias of the closing element in its rest position can be effected by a spring element. In this case, the bias preferably acts in a radial direction with respect to the axis of the yarn guide opening against a stop which may be formed on the body. The spring means may be formed by the closing element itself or carry the closing element. A separate storage or hinge is then not required. This results in a simple structure. The closing element is preferably movably mounted transversely to its longitudinal direction. Alternatively, it could also be arranged longitudinally movable. However, the transverse mobility is advantageous when inserting the thread. The preferably elongated, for example, cylindrical closure element can at only one end or be held at its two ends to be moved radially to open the eyelet. The opening of the eyelet, in particular if the closing element consists of an elastomer, can also release the opening for threading in the thread by deforming its cross section.

The spring means may be housed in a pocket of the body and captively hold the closure member to the body. It preferably forms a pivot bearing by means of which the closing element against its bias from the Fadeneinführschlitz out at least partially into the thread guide opening can be moved to release the Fadeneinführschlitz for the thread.

The suture eyelet may be connected to a wearer by any suitable means. The carrier may for example be a wire bow, a metal strip or a similarly trained holder. For example, legs of the wire bow or sheet metal strip may be bent around the body of the thread eye in order to fix it. It is also possible to glue the thread eyelet to the carrier, to be soldered, to be welded or to jam. Preferably, however, a locking connection is provided which is on the one hand easy to install and on the other hand safe. The latching connection can be formed by latching means, which are alternatively arranged on the carrier and / or the body. For example, the locking means may include a spring means securing the body to the wearer. The spring means may be the same spring means as provided for supporting the closing element. It is also possible to provide separate spring means.

Further details of advantageous embodiments The invention are the subject of the drawing, the description or claims.

In the drawing, an embodiment of the yarn eye according to the invention is illustrated together with exemplary use of a yarn feeding device. Show it:

FIG. 1 is a perspective view of a yarn feeding device with eyelets according to the invention;

FIG. 2 shows yarn eyelets of the yarn feeding device according to the invention on the outlet side according to FIG. 1 in a perspective view on a different scale,

FIGS. 3 and 4 show a thread eyelet attached to a yarn feeler in various perspective views, on a different scale;

5 shows the thread eyelet according to FIGS. 3 and 4 in a vertically sectioned illustration,

6 shows the thread eyelet of Figure 3 to 5 in a schematic and simplified plan view,

FIGS. 7 and 8 show a modified embodiment of the eyelet in various perspective illustrations;

FIG. 9 shows the thread eyelet according to FIGS. 7 and 8 in a vertical section,

10 and 11 show a further modified embodiment of a thread eyelet, as may be provided on the yarn feeding device according to FIG. 1 on the inlet sensor, FIG. in different perspective views,

FIG. 12 shows the eyelet according to FIGS. 10 and 11 in a cutaway view,

13 shows a particularly simple and robust embodiment of the thread eyelet according to the invention in plan view,

14 shows the thread eye of Figure 13 in a different scale in perspective and

Figure 15 shows the thread eye of Figure 14 in a perspective sectional view.

In Fig. 1 there is illustrated a yarn feeding apparatus 1 which serves, for example, to feed a yarn 2 to a knitting machine, e.g. to deliver a circular knitting machine. The yarn feeding device 1 has a holder 3 to be connected to the knitting machine, on which a shaft is rotatably supported oriented vertically. On the shaft sit one or more pulleys 4, 5, which are rotatably connected to the shaft alternatively via a manually operable toothed coupling 6. The pulleys 4, 5 serve as drive means for the shaft. Alternatively, other drive means may be used, such as electric motors (e.g., DC motors or stepper motors).

The shaft carries at its lower end a yarn feed wheel 7, which is preferably wrapped by the thread 2 several times. By the rotation of the yarn feed wheel 7, the yarn 2 is conveyed to the knitting machine. In this case, the thread 2 runs controlled on a conical inlet region of the yarn feed wheel 7, passes from there to a ribbed storage area and runs controlled, for example, on the lower issued edge grazing from.

The thread passes through an input side arranged node catcher 8, a thread brake 9, an inlet sensor 10, the end carries a thread eyelet 11, and then passes to the yarn feed wheel 7. If he then leaves the yarn feed wheel 7, he passes through a spout sensor 12 with a plurality of eyelets 13, 14, 15. While the suture eyelet 13 and 15 is stationarily arranged on a support plate 16, the intermediate thread eye 14 is mounted on a laterally pivotable, also consisting of a sheet metal or of a wire lever 17. While the inlet sensor 10 about a transverse axis oriented to the running thread Schwenkach- is pivotally mounted, serving as the outlet sensor lever 10 is pivotally mounted about a pivot axis which is oriented approximately parallel to the thread 2, as it runs between the eyelets 13 and 15.

Figure 2 illustrates the suture loops 13, 14, 15 of the spout probe assembly 12 separately. The eyelets 13, 14, 15 have in common that they each have a wear-resistant material, such as ceramic existing body 18, 19, 20 which is held on the carrier 16 and the lever 17. In addition, each body 18, 19, 20 has a yarn guide opening 21, 22, 23 through which the yarn 2 extends. The guide openings 21, 22, 23 are each formed approximately oval and interrupted at its edge by an insertion slot 24, 25, 26. In this, a closing element 27, 28 is arranged, as it is illustrated on the eyelets 13, 14.

The insertion slot 24, 25, 26 is arranged in each case on the side of the thread guide eye 13, 14, 15, on which the current thread is not normally applied. Accordingly, the suture eyelets 13, 14, 15 are oriented differently with respect to their longitudinal axis determined by the thread guide openings 21, 22, 23. The suture eyelets 13, 15 may be formed completely equal to each other and mounted only opposite by 180 °. The following description of the eyelet 13 with reference to FIGS. 3 to 6 thus applies correspondingly to the eyelet 15:

The body 18 is preferably formed integrally from ceramic. Its central thread guide opening 21 is formed oval. It has mutually opposite semicircular curved wall sections 29, 30 and planar if opposing, substantially flat or straight wall sections 31, 32. The wall portion 32 is interrupted by the insertion slot 24, which is preferably arranged inclined. He concludes with the closing element formed by a cylindrical ceramic body 27 an acute angle. The insertion slot 24 runs to the lower free, apparent from Figure 5, end 33 of the closing element 27 out. The closure member 27 lies in a recess or pocket formed in the body 18. It is held therein by a spring means 34 in the form of a leaf spring 35 which biases the end 33 of the closure member 27 against a stop 36 formed on the body 18 in immediate proximity to the insertion slot 24. The leaf spring 35 carries the closing element 27 and biases this radially outwards, ie in a direction away from the thread guide opening 21. The pocket for receiving the closing element 27 is dimensioned so large that on the one hand it receives the closing element 27 in the illustrated in Figure 5 rest position. In this closes the closing element 27 substantially smoothly to the other sections 29, 31, 30, 32 of the wall. On the other hand, the pocket is so large that the closing element 27 can be pivoted radially inwardly with at least partial release of the insertion slot 24, the leaf spring 35 being deformed exclusively elastically.

As FIGS. 3 to 6 furthermore show, the body 18 preferably has at least on one side a collar 37 which surrounds a non-circular, ie not cylindrically shaped seat surface 38 of the body 18. The seat 38 has the same shape as a corresponding opening in the carrier 16, but it is slightly smaller can be. As a result, the body 18 sits with a small clearance in the corresponding opening of the carrier 16.

The pocket for receiving the closing element 27 may be formed crossing the insertion slot 24 and then continue over part of the seat surface 38. The thus created elongated receiving space can serve to receive the leaf spring 35. This can, as Figure 6 illustrates, not only be designed as a spring means for the closing element 27 but at the same time as a locking means to secure the thread eye 13 on the carrier 16. For example, the leaf spring preferably extends to a position opposite the insertion slot 24. It has here a leg 39, which is stretched radially outward from the thread guide opening 21 away. Leg 39 engages the wall of the opening of sheet 16 to receive body 18. Leg 35 may be split or, as shown, may have a nose-like projection to lock body 18 to carrier 16. On the opposite side of the body 18 may have on both sides of its seat 38 projections that secure it to the support 16.

While the suture eyelet 13 or 15 is preferably secured by a locking means on the carrier 16 and having a body 18 which projects through the carrier 16 and together with the closing element 27, the yarn guide opening 21 completely bounded, for example, for applications where it on Weight minimization arrives, a suture eyelet 14 are seen according to Figure 7 to 9 before. The corresponding body 19 is seated on a flat side of the lever 17 and has an oval-shaped extension 40 which, with little play, projects into a lever 17 in the lever 17. seen opening 41 fits. The front side of the extension 40 and the flat side of the lever 17 close substantially flat with each other. A slight projection of the extension 40 is permissible. The formed in the body 19 pocket for receiving the closing element 28 is closed by corresponding portions 42, 43 of the lever 17. The body 19 is connected to the lever 17, for example by an adhesive connection. The pocket provided for receiving the closing element 28 extends arcuately through the body 19. The spring means 34 may be, for example, a wire spring 44, the free end of which is inserted in the blind-ending pocket.

The advantage of this embodiment is that the body 19 is formed without any undercut and thus can be produced in a simple pressing process with a tool without moving parts.

Figures 10 to 12 illustrate a further embodiment in the form of the thread eyelet 11, as it may be provided on the inlet sensor 10 or possibly also at another suitable location.

The eyelet 11 has a body 45 made of ceramic or other suitable hard and wear-resistant material, the basic shape emanating from a Thorus. This is externally provided with a circumferential groove 46 which is bounded by a cylindrical surface and by a flat annular surface. In addition, the body 45 is slit to form an insertion slot 47 for a thread. The insertion slot 47 leads to the centrally arranged, in cross section circular thread guide opening 48th The insertion slot 47 is bridged by a closing element 49 which is formed by a leg of a wire spring 50. The wire spring 50 is preferably made of a wire with a circular cross-section. This lies in a groove-like pocket which extends around the cylindrical bottom surface of the groove 46 around. The pocket then bridges the insertion slot 47 and is dimensioned so deep that the leg 49 can be pivoted into the thread guide opening 48 under elastic deformation. While the pocket is open radially outward to one side of the insertion slot 47, it is closed radially outwardly by a stop 51 on the other side (on the right in FIG. 12). At this the free end of the wire spring 50 is located. This can, as shown, have a bent portion. On the other side of the insertion slot 47 (left in FIG. 12) there is a wedge-shaped gap between the wire spring 50 and the bottom 52 of the receiving groove for the wire spring to permit elastic pivoting of the corresponding free leg of the wire spring 50.

The yarn feeding device 1 described so far is equipped with thread as follows:

When the yarn feeding device 1 is mounted on a knitting machine and a yarn 2 is to be drawn in, it is first guided to the yarn feeding device until it is above the yarn brake 9. It is then pulled a good distance by hand, so that the operator holds a longer free end, for example, half a meter in length in his hands. This is then pushed between the brake rings of the thread brake 9. In the eyelet 11 of the thread is clipped by passing through the insertion slot 47th is moved radially into the yarn guide opening 48 into it. The thread 2 presses the closing element 49 briefly out of a rest position and then jumps over the free rounded end. The closing element 49 then snaps back into its rest position illustrated in FIG.

For further threading the operator then sets the desired number of turns of thread turns on the yarn feed wheel 7 and presses the thread respectively through the insertion slot 24, 25 and 26 in the eyelets 13, 14, 15. In this case, the thread urges the relevant closing element from its rest position out. The closing element springs back as soon as the thread is seated in its thread guide opening 21, 22 or 23.

The yarn feeding device 1 is thus ready for operation. The taut yarn holds the inlet sensor 10 and the lever 17 of the spout probe assembly 12 in the positions illustrated in FIG. If the thread flutters or tears, the inlet sensor 10 pivot away from the yarn feed wheel 7 or the lever 17 laterally out of its vertical position, in which its thread eye 14 is aligned with the eyelets 13, 15.

If the thread is torn or missing, a new thread, as described above, in the eyelets 11, 13, 14, 15 are inserted. The threading is much easier compared to closed eyelets. On the other hand, the thread can not undesirably reach the thread eyelets 11, 13, 14, 15 in any operating state.

Figures 13 to 15 show a presently preferred embodiment of the invention, which is characterized by particular Simplicity and robustness. The eyelet 53 illustrated in FIG. 13 is held in a desired position by a wire bracket 54 or other retaining means. The eyelet 53 has a body 55, for example made of ceramic or a suitable other wear-resistant material, such as cemented carbide, ceramic-coated plastic or the like. This body is substantially U-shaped in plan view, wherein between its two legs 56, 57 a yarn guide opening 58 is defined. If necessary, an inserted thread runs through it.

As can be seen in particular from FIG. 14, the thread guide opening 58 is closed by a hook 59 which extends from one end of the leg 56 towards the other leg 57 and projects into a pocket 60 provided in the leg 57. Thus, the thread guide opening 58 is closed from the viewpoint of the thread. Between the leg 57 and the outer back of the hook 59, an insertion slot 61 is formed, through which a thread can be inserted into the thread guide opening 58. However, the insertion slot 61 is closed by means of a closing element 62. This is preferably done by e.g. cylindrical elastomeric body 63 is formed, which elastically bears with low bias to the outer tip 64 or in particular to the tip 64 extending back of the hook 59. It thus closes the insertion slot 61.

The closer construction of the thread eye 53 and in particular the interaction of the closing element 62 with the hook 59 for closing the insertion slot 61 can be seen in FIG. This illustrates a vertical section through the Thread loop, wherein the cut is guided transversely to the thread guide opening 58. As can be seen, the pocket 60 for receiving the elastomeric body 63 has an approximately circular cross-section. The cross section may also differ from the circular shape. For example, the cross section may be polygonal. It may, for example, be square, rectangular or oval, in the form of an I-profile or otherwise, as a hollow profile or as a solid profile. At the hook 59 side facing the pocket 60 is provided with a window 65 through which the tip 64 of the hook 59 extends to the elastomeric body 63. The window 65 adjoins the yarn guide opening 58. The elastomeric body 63 abuts in a region 66 near the tip 64 on the outside of the hook 59. Both ends 67, 68 of the elastomeric body 63 are held firmly in the pocket 61 with respect to longitudinal and transverse movement of the elastomeric body 63. By deformation of the elastomer body 63, however, this can release the insertion slot 61 a gap far. In this case, the elastomeric body 63 differs either in its central region in the radial direction of the hook 59 and the hook tip 64 away something. This can be done while maintaining its cross-section, when a relatively little elastic plastic or elastomer is used. If a softer elastomer or plastic is selected, the elastomeric body 63 can also experience a cross-sectional deformation when threading thicker threads.

The elastomeric body 63 may be straight in its longitudinal direction or bent one or more times. Opposite the window 65 is preferably provided in the body 55 a further window which opens radially outwards. The elastomeric body 63 can touch a carrier 54 through this window and contact it at this point. support. He can additionally secure the eyelet 53 to the carrier 54.

The elastomeric body 63 can come into contact with the thread itself only when threading the thread. Otherwise, the more or less tight thread can not reach the elastomeric body 63. This is particularly shown in Figures 14 and 15. The window 65 is bounded by two webs 67, 68 which are arranged at a small distance parallel to each other on the leg 57 are formed. The two webs 67, 68 keep the thread away from the elastomeric body 63. The hook 59 projects between the two webs 67, 68 and contacts the elastomeric body 63 within the window 65.

A thread eye 11 which can be used, for example, for yarn feeding devices defines a thread guide opening 48. The thread eyelet 11 is laterally slotted. The insertion slot 47 is blocked by a closing element 49, which can be converted, for example, by the thread as needed in an open position. The closing element is preferably spring-mounted. Preferably, it is pivotally mounted in the yarn guide opening. The thread eye 11 is kept closed by spring force.

LIST OF REFERENCE NUMBERS

1 thread feeding device

2 threads

3 holders

4 pulley

5 pulley

6 gear coupling

7 thread delivery wheel

8 knot catcher

9 Thread brake

10 inlet sensor

11 thread eyelet

12 outlet sensor arrangement

13 thread eyelet

14 thread eyelet

15 thread eyelet

16 carriers

17 levers

18 bodies

19 bodies

20 bodies

21 thread guide opening

22 thread guide opening

23 thread guide opening

24 insertion slot

25 insertion slot

26 insertion slot

27 closing element

28 closing element

29 wall section

30 wall section

31 wall section wall section

The End

spring means

leaf spring

attack

Federation

seat

leg

extension

opening

section

wire spring

body

groove

insertion

Thread guide opening

Schließeleinent

wire spring

attack

ground

eyelet

wire hanger

body

leg

Thread guide opening

hook

bag

insertion

Schließelernent

elastomer body

top Window area bridge bridge

Claims

Claims:

1. thread eye (11, 13, 14, 15, 53) for a thread-guiding textile-technical device, in particular a yarn feeding device (1),

a body (45, 18, 19, 20, 55) enclosing a yarn guide opening (48, 21, 22, 23, 58) having an edge interrupted by an insertion slot (47, 24, 24, 26, 61) .

with a closing element (49, 27, 28, 62), which is arranged on the insertion slot (47, 24, 24, 26, 61) and movably mounted to the insertion slot (47, 24, 24, 26, 61) for insertion a thread (2) to release and otherwise close,

characterized in that the closing element (49, 27, 28, 62) is resiliently biased towards its closed position.

2. An eye according to claim 1, characterized in that the body (45, 18, 19, 20, 55) is formed of a ceramic material or of a material containing ceramic material.

3. thread eye according to claim 1, characterized in that the body (45, 18, 19, 20, 55) is formed of a hard metal or a material containing cemented carbide.

4. thread eye according to claim 1, characterized in that the thread guide opening (48, 21, 22, 23, 58) a Has wall, which occupies a Öffnungsachse at least 180 °.

5. Fadenose according to claim 1, characterized in that the Fadenfuhrungsoffnung (48, 21, 22, 23, 58) has a wall, the posted occupies a Öffnungsachse at least 240 °.

6. Fadenose according to claim 1, characterized in that the Fadenfuhrungsoffnung (49, 58) is round.

7. Fadenose according to claim 1, characterized in that the Fadenfuhrungsoffnung (21, 22, 23, 58) is oval.

8. Fadenose according to claim 7, characterized in that the insertion slot (47, 24, 24, 26, 61) on a straight side (32) of the oval Fadenfuhrungsoffnung (21, 22, 23, 58) is arranged.

9. Fadenose according to claim 1, characterized in that the closing element (49, 27, 28, 62) of the Fadenfuhrungsoffnung (48, 21, 22, 23, 58) is biased by a spring means in the radial direction against a stop to the outside.

10. Fadenose according to claim 1, characterized in that the closing element (49, 27, 28, 62) is in the form of a cylindrical or prismatic body.

11. Thread eye according to claim 1, characterized in that the closing element (27, 28) is formed of ceramic material or of a material containing ceramic material.

12. thread eye according to claim 1, characterized in that the closing element (49) consists of a wire.

13. thread eye according to claim 1, characterized in that the closing element (49, 62) is formed deformable.

14. thread eye according to claim 13, characterized in that the closing element (62) consists of an elastomer.

15. thread eye according to claim 1, characterized in that the body (55) has a hook (59) and that the closing element (62) resiliently against the hook (59).

16. thread eye according to claim 9, characterized in that the closing element (49, 27, 28) by the spring means (34) is supported.

17. thread eye according to claim 1, characterized in that the closing element (49) by a portion of the spring means (34) is formed.

18. thread eye according to claim 1, characterized in that the body (45, 18, 19, 20, 55) has a seat surface (38) for supporting the body (45, 18, 19, 20) on a support (10, 16, 17, 54).

19. Thread eye according to claim 18, characterized in that the seat surface (38) is formed out of round.

20. thread eye according to claim 1, characterized in that the body (18, 20, 55) has a latching fastening means (39) for attachment to a carrier (16).

A suture eyelet according to claim 20, characterized in that the latching attachment means (39) includes a groove provided on the outside of the body (18, 20) and an opposed spring means (35).

22 thread eye according to claim 9 and 21, characterized in that the spring means (35) on the one hand carries the closing element (27) and on the other hand, the body (18, 20) on a support (16) is supported.

23. Device with a thread eye (11, 13, 14, 15, 53) according to any one of the preceding claims.

24. Apparatus according to claim 23, characterized in that it is designed as a yarn feeding device (1).