EP3168343A1 - Ball thread brake for a double wire twisting spindle - Google Patents

Abstract

A ball thread brake for a double-twisting spindle containing - A tubular brake housing (1), consisting of an upper housing portion (2) and a lower housing portion (3) screwed therewith; - A coaxially in the upper housing portion (2) rotatably mounted thread inlet tube (4); - An the thread inlet tube (4) associated upper brake surface ring (6), whose height position is effected by turning the thread inlet tube (4); - One with this brake surface ring (6) cooperating brake ball (7); - One in the lower housing portion (3) sealingly guided, axially displaceable piston (9), the - on the outside of its upwardly directed bottom (9.1) carries a lower brake surface ring (10), and the - By suction against the force of a return spring (12) is adjustable in the axial direction down, - A arranged between the two brake surface rings holding device for the brake ball a braking force adjusting device acting on the brake unit consisting of the two brake surface rings and the brake ball, is characterized - That the holding device for the brake ball (7) at the lower end of the upper brake surface ring (10) bearing sleeve (5) is mounted.

Description

The invention relates to a ball-thread brake according to the preamble of patent claim 1.

In the case of double-twisting machines, the thread to be twisted must be subjected to a defined thread tension before it enters the rotating spindle. This yarn tension must be chosen so that a stable twisting process over the entire life of the coil is guaranteed. The criterion for the necessary thread tension is that over the entire spool travel on the thread storage disc of the twisting spindle a minimum thread storage must not be exceeded, so that the thread balloon remains stable. If the storage falls below this value, the thread balloon tends even with minor disturbances (mass variations in the yarn balloon or entanglements on the feed bobbin) to invade temporarily. This leads to undesirable contact of the thread balloon with the edge of the pot, which can lead to yarn damage up to the thread breakage. Furthermore, a freely rotatable twisting wings is provided with a trained original yarn to support the yarn path, passed through the template yarn and fed through an eyelet the thread inlet tube and positioned inside the feed bobbin yarn brake. The twisting wing rotates and causes in addition to the actual thread brake a certain thread braking (bias), which can be varied by additional load weights.

As thread brakes so-called capsule brakes have been proven in practice. The main component of these brakes is a between two brake surface rings, usually two ceramic eyelets, clamped brake capsule, which consists of an upper part and a lower part and a spring clamped therebetween, which presses the Bremskapselkalotten against the brake surface rings. The yarn is passed between two clamping points. In conventional embodiments, the spring clamping effect and thus the force exerted on the thread normal force and thus the braking effect is adjusted to the thread by adjusting the distance between the two brake surface rings. For this purpose, the thread inlet tube is usually adjusted in height, which is undesirable on the one hand for reasons of space and on the other hand due to the change of the inlet angle of the yarn in the thread inlet pipe.
This adjustment takes place before the beginning of the twisting process and remains unchanged during the winding process. In order to cover the generally common yarn tension range for various yarns, materials and spindle sizes, there are brake caps with different degrees of springs, or there are brake capsules in which the springs can be replaced depending on the required braking force. This procedure is cumbersome, because on the one hand the capsule change is time consuming, and on the other hand, several capsule variants are necessary. The latter requires an increased Betriebsselementenaufwand and can lead to confusion of the capsule, if they are not marked accordingly unmistakable.

The required threading of the original yarn in these brakes and their thread guides is done either manually by means of appropriate Einfädelhilfswerkzeuge (eg., Long plastic wires) or by means of a pneumatic threading device, in which the thread is automatically threaded through the air passage enabled by pneumatic effects by means of a suction air flow.

In the EP 2 336 408 B1 is described in accordance with the preamble of claim 1, a spring-adjustable ball-thread brake with an upper brake surface ring, a lower brake surface ring and located between these two brake surface rings brake ball. A brake force adjusting spring is clamped between the upper surface of the upper brake surface ring and a spring element abutment, which can lead to complications in the assembly and / or maintenance of the thread brake. The adjustment of the braking force via a stepwise height adjustment of the thread inlet tube, whereby the force acting on the upper brake surface ring force is changed. In the pneumatic threading or threading of a thread or yarn of the lower brake surface ring is moved by means of negative pressure down, whereby the way is free for an air flow through the brake, so that the applied to the upper end of the thread inlet tube thread conveyed through the entire brake becomes. In this case, the brake ball deviates either laterally or it comes on a Bestanteil of the brake housing forming receiving element for support, whereby a path for the thread or the yarn is released. For example, if the brake housing is opened for general maintenance or cleaning purposes, there is a risk of the brake ball falling out and being lost.

The invention has for its object to make a ball thread brake so that it is ensured that the brake ball can not fall out of the brake housing during maintenance and cleaning.

To solve this problem, the feature of the characterizing part of claim 1 is used.

In order to prevent the pneumatic thread threading and thereby caused adjustment of the lower brake surface ring down that the brake ball remains on the lower brake surface ring is provided between the two brake surface rings during the pneumatic Fadendurchfädelung effective brake ball holding device in the form of a brake ball-catching which is arranged at the lower end of a sleeve carrying the upper brake surface ring and whose structural design is the subject of claim 2.

To avoid adjusting the height of the thread inlet tube to adjust the braking force, according to claim 2, an extended core idea of the invention is to effect the braking force adjustment solely by turning the thread inlet tube. For this purpose, the upper brake surface ring is integrated in an element which converts a rotational movement of the thread inlet tube into an axial movement of the upper brake surface ring.

Preferred embodiments of the invention are dealt with in the subclaims.

• Figur 1 einen Axialschnitt der erfindungsgemäßen Fadenbremse in einer ersten Einstellposition;
• Figur 2 einen Axialschnitt entsprechend Figur 1, jedoch in einer relativ zu Figur 1 um 90° gedrehten Position;
• Figuren 3 und 4 Axialschnitte entsprechend den Figuren 1 und 2 in einer zweiten Einstellposition der Fadenbremse;
• Figur 5 einen Axialschnitt der erfindungsgemäßen Fadenbremse während der pneumatischen Durchfädelung in einer ersten Einstellposition entsprechend der ersten Einstellposition gemäß den Figuren 1 und 2;
• Figur 6 einen Axialschnitt der in Figur 5 dargestellten Fadenbremse, in einer gegenüber Figur 5 um 90° gedrehter Stellung der Fadenbremse;
• Figuren 7 und 8 Axialschnitte entsprechend den Figuren 5 und 6 in einer zweiten Einstellposition;
• Figur 9 in vergrößerter Darstellung einen Axialschnitt des unteren Teils der in Figur 4 dargestellten Fadenbremse;
• Figur 10 in vergrößerter Darstellung einen Axialschnitt des oberen Teils der in Figur 4 dargestellten Fadenbremse;
• Figuren 10B einen Radialschnitt gemäß der Linie A-A bzw. B-B in Figur 10.

The invention will be described in more detail below with reference to the drawing. Show it:

• FIG. 1 an axial section of the yarn brake according to the invention in a first adjustment position;
• FIG. 2 an axial section accordingly FIG. 1 but in a relative to FIG. 1 rotated by 90 ° position;
• FIGS. 3 and 4 Axial sections according to the Figures 1 and 2 in a second setting position of the thread brake;
• FIG. 5 an axial section of the thread brake according to the invention during the pneumatic threading in a first setting position corresponding to the first setting position according to the Figures 1 and 2 ;
• FIG. 6 an axial section of in FIG. 5 shown thread brake, in a opposite FIG. 5 rotated by 90 ° position of the thread brake;
• FIGS. 7 and 8 Axial sections according to the FIGS. 5 and 6 in a second setting position;
• FIG. 9 in an enlarged view an axial section of the lower part of in FIG. 4 shown thread brake;
• FIG. 10 in an enlarged view an axial section of the upper part of in FIG. 4 shown thread brake;
• Figures 10B a radial section along the line AA or BB in FIG. 10 ,

• ein rohrförmiges Bremsengehäuse 1, bestehend aus einem oberen Gehäuseabschnitt 2 und einem mit dem oberen Gehäuseabschnitt 2 lösbar verbundenen unteren Gehäuseabschnitt 3,
• ein in den oberen Gehäuseabschnitt 2 koaxial eingesetztes, drehbar gelagertes Fadeneinlaufrohr 4, das mittels eines nach außen vorspringenden Rastringes 4.1, der in eine im oberen Gehäuseabschnitt 2 angebrachte Rastnut 2.1 eingreift, gegen Axialverschiebung gesichert ist,
• an dem Fadeneinlaufrohr angebrachte oder angeformte, seitlich von dem Fadeneinlaufrohr verlaufende Arme 4.2, an deren unteren Enden nach innen gerichtete Nasen 4.3 angebracht sind;
• eine gegen Rotation gesicherte Hülse 5 mit einer an der Außenseite angeordneten wendelförmigen Nut bzw. Kulissenführung 5.1 mit konstanter oder nicht konstanter Steigung der Wendelgänge 5.1, in die die Nasen 4.3 des Fadeneinlaufrohres 4 eingreifen.

The in the Figures 1 and 2 shown thread brake contains essentially the following individual elements:

• a tubular brake housing 1, comprising an upper housing section 2 and a lower housing section 3 detachably connected to the upper housing section 2,
• a coaxially inserted into the upper housing section 2, rotatably mounted thread inlet tube 4, which is secured by means of an outwardly projecting locking ring 4.1, which engages in a mounted in the upper housing section 2 locking groove 2.1, against axial displacement,
• attached to the thread inlet tube or molded, extending laterally from the thread inlet tube arms 4.2, at the lower ends inwardly directed lugs 4.3 are attached;
• a secured against rotation sleeve 5 with a arranged on the outside helical groove or slide guide 5.1 with constant or not constant pitch of the helical gears 5.1, in which the lugs 4.3 of the thread inlet tube 4 engage.

The length of the sleeve 4 determines the length of Verstellweges the upper brake surface ring 6 and can be selected depending on the intended applications accordingly. The sleeve 5 is provided at its lower end with a flange 5.2, according to FIG. 9 preferably two opposing locking lugs 5.3, engage in the arranged on the inner wall of the upper housing portion 2 not shown locking grooves to prevent rotation of the sleeve 5.

The two housing sections can be fastened to each other by screwing, by clipping or bayonet-like.

• eine gegen den oberen Bremsflächenring 6 anliegende Bremskugel 7;
• eine unterhalb des Flanschringes 5.2 der Hülse 5 angeordnete, eine Kugelfangeinrichtung bildende Halteeinrichtung für die Bremskugel 7; diese Halteeinrichtung hat mindestens zwei sich gegenüberliegende, nach innen gebogene Halteelemente 8, deren untere freien Enden unterhalb des Hauptdurchmessers der Bremskugel 7 liegen, um, wie es später noch beschrieben wird, beim pneumatischen Öffnen der Bremse ein Herausfallen der Bremskugel 7 zu verhindern;

In the lower end of the sleeve 5, the upper brake surface ring 6, preferably in the form of a Keramiköse used.
It is still provided

• a bearing against the upper brake surface ring 6 brake ball 7;
• a arranged below the flange 5.2 of the sleeve 5, forming a ball catching holding device for the brake ball 7; this holding device has at least two opposing, inwardly bent retaining elements 8, the lower free ends are below the main diameter of the brake ball 7, as will be described later, during pneumatic opening of the brake to prevent falling out of the brake ball 7;

In the lower housing portion 3, a sealingly guided, axially displaceable piston 9 is mounted, which carries on the outside of its upwardly directed bottom 9.1 a lower brake surface ring 10, preferably in the form of a ceramic eyelet for the brake ball 7.

The lower housing portion 3 is provided at its lower end with an inwardly directed support flange 3.1, on which a spring guide sleeve 11 is supported for a preferably biased return spring 12 for the piston 9. On the inside of the piston head 9.1 includes a downwardly directed pipe socket 9.2, which is surrounded by a relative to the pipe socket 9.2 axially displaceable spring support sleeve 13. The spring support sleeve 13 is provided at its upper end with an outwardly directed support flange 13.1 for the upper end of the return spring 12. This spring support sleeve 13 carries in the region of its upper side against the inside of the piston crown 9.1 oppressive brake force adjusting device in the form of a braking force-adjusting spring 14, which has a suitably designed spring stiffness depending on the intended application of the thread brake. This braking force adjusting spring 14 takes in the in the FIGS. 3 and 4 shown setting position of the thread brake occupies its almost relaxed position when fixed in an upper end position upper brake surface ring 6. In the in the Figures 1 and 2 shown setting position is this braking force-adjusting spring 14 at downwardly adjusted upper brake surface ring 6 in its almost completely compressed state, which is exerted by this braking force-adjusting spring 14, the highest braking force on the continuous thread.

For a further increase in the braking force can preferably be adjusted by appropriate dimensioning of the sleeve 5 of the upper brake surface ring 6 further down, such that the return spring 12 is loaded and also effective as a braking force adjusting spring.

At the lower end of the spring support sleeve 13 arms 13.1 are arranged with outwardly directed locking lugs 13.2, which can come against an inwardly directed stop ring 11.1 of the spring guide sleeve 11 to the plant.

According to a preferred embodiment of the invention, the braking force adjusting spring 14 can be omitted and the force acting on the piston 9 return spring 12 alone Be effective brake force adjusting spring, which is designed accordingly, and, for example, preferably over its length sections with different spring stiffness.

The thread brake according to the invention can between the in the Figures 1 and 2 on the one hand and in the FIGS. 3 and 4 on the other hand represented extreme working positions and between the FIGS. 5 and 6 on the one hand and in the FIGS. 7 and 8 on the other hand shown extreme threading positions are adjusted.

For threading or threading a yarn or thread of the lower piston 9 is lowered by applying a negative pressure to the central opening of the lower housing portion 3 against the force of the return spring 12 from the working position to the threading, wherein the brake ball 7 of the holding elements 8 of Holding device risen or held and the connection is released to the thread inlet tube 4, so that a held on the upper end of the thread inlet tube 4 yarn is threaded through suction air through the thread brake.

At the thread inlet pipe 4, an outwardly directed spring-loaded locking lug 4.4 is arranged, which engages in detents of a arranged on the inner circumference of the upper housing portion 2 locking ring 2.4. At the thread inlet pipe 4 is a circumferentially extending (not shown) dial scale attached, which is visible through a arranged in the upper housing section 2 window 2.5 to read depending on the engaged position of the locking lug 4.4 in the locking ring 2.4 the respective rotational position of the thread inlet tube 4 can and thus recognize the height position of the upper brake surface ring (6) and depending on the set braking force.

To be able to detect a large braking force range with known capsule brake, it was, as already explained above, previously necessary to use in complex and thus disadvantageous way several capsules with different braking force ranges, since each capsule, in particular depending on the spring force within the Capsule located spring, only for a limited braking force range has been used.

• als Variante A in Form der Bremskraft-Einstellfeder 14;
• als Variante B in Form der durch die Rückstellfeder 12 unterstützten Bremskraft-Einstellfeder 14 oder
• als Variante C in Form der Rückstellfeder 12 allein.

This disadvantage is remedied with the ball-thread brake according to the invention, in which the braking force-adjusting device effecting the braking force is arranged under the lower brake surface ring 10, specifically

• as variant A in the form of the braking force adjusting spring 14;
• as a variant B in the form of the supported by the return spring 12 brake force adjusting spring 14 or
• as a variant C in the form of the return spring 12 alone.

LIST OF REFERENCE NUMBERS

1

brake housing

2

Upper housing section

2.1

locking groove

2.3

detent ring

2.4

window

3

lower housing section

3.1

support flange

4

Yarn inlet pipe

4.1

locking ring

4.2

poor

4.3

nose

4.4

locking lug

5

Sleeve with arranged on the outside Nur or link guide

5.1

helical groove or slide guide

5.2

flange

5.3

Rasnasen

6

Upper brake surface ring (ceramic eyelet)

7

brake ball

8th

retaining elements

9

working piston

9.1

piston crown

9.2

pipe socket

10

lower brake surface ring (ceramic eyelet)

11

Spring guide sleeve

12

Return spring

13

Spring support sleeve (s)

13.1

poor

13.2

locking lugs

13.3

support flanges

14

Brake force adjusting device in the form of a brake force adjusting spring

Claims (12)

Ball thread brake for a double-twisting spindle, containing - A tubular brake housing (1), consisting of an upper housing portion (2) and a detachably connected to the lower housing portion (3); - A coaxially in the upper housing portion (2) rotatably mounted thread inlet tube (4); - An the thread inlet tube (4) associated upper brake surface ring (6), whose height position is effected by turning the thread inlet tube (4); - One with this brake surface ring (6) cooperating brake ball (7); - One in the lower housing portion (3) sealingly guided, axially displaceable piston (9), the - on the outside of its upwardly directed bottom (9.1) carries a lower brake surface ring (10), and the - For the purpose of a pneumatic threading of a thread or yarn by means of suction against the force of a return spring (12) is adjustable in the axial direction down, - A arranged between the two brake surface rings holding device for the brake ball a braking force adjusting device acting on the brake unit consisting of the two brake surface rings and the brake ball,
characterized, - That the holding device for the brake ball (7) at the lower end of the upper brake surface ring (10) bearing sleeve (5) is mounted. Ball-thread brake according to claim 1, characterized in that the holding device has at least two opposing, inwardly bent retaining elements (8) whose free ends are below the diameter of the brake ball (7). Ball-thread brake according to claim 1 or 2, characterized in that the thread running tube (4) is mounted rotatably secured against axial displacement and via a a rotational movement in an axial displacement causing element (5) acts on the upper brake surface ring (6). Ball-thread brake according to one of claims 1 to 3, characterized in that the braking force adjusting spring (14) is mounted on a within the piston (9) axially displaceably mounted spring support sleeve (13) acted upon by the return spring (12) in the direction of the lower brake surface ring becomes. Ball-thread brake according to claim 4, characterized in that the spring support sleeve (13) at its upper end an outwardly directed support flange (13.3) for the upper end of the return spring (12), the lower end of an inwardly directed support flange (3.1) on bottom end of the lower housing portion (3) is supported. Ball-thread brake according to claim 4 or 5, characterized in that the piston (9) is provided with an inner pipe socket (9.2) adjoining the piston head (9.1) and the opening of the lower brake surface ring (10), on which the spring support sleeve (13) axial direction is guided. Ball-thread brake according to one of Claims 4 to 6, characterized by a spring guide sleeve (11), which is arranged in the lower housing section (3) and supports the return spring (12), in which the spring support sleeve (13) is guided, which is provided with outwardly directed latching lugs (13.2). for cooperation with an inwardly directed stop flange (13.3) of the spring support sleeve (13) is provided. Ball-thread brake according to one of claims 3 to 7, characterized in that the element (5) in the upper housing portion (2) axially displaceable, secured against rotation sleeve (5) having on the outside a helical slotted guide (5.1), in the inwardly directed lugs (4.3) engage, which are parts of the thread inlet tube (4). Ball-thread brake according to Claim 8, characterized by tine-like arms (4.2) arranged laterally on the thread inlet pipe (4) and to which the noses (4.3) are attached. Ball-thread brake according to one of claims 8 or 9, characterized in that at the lower end of the sleeve (5) of the upper brake surface ring (6) is arranged. Ball-thread brake according to one of Claims 1 to 10, characterized by an outwardly directed latching lug (4.4) arranged on the thread inlet tube (4) and arranged in a latching ring (2.4) arranged on the inner wall of the upper housing section (2) and having radially inwardly projecting notches intervention. Ball-thread brake according to Claim 11, characterized by a window (25) mounted in the upper housing section (2) for viewing a numerical scale attached to the thread inlet pipe (4) in the circumferential direction and depending on the engagement position of the latching lug (4.4) in the detent ring (2.4) indicates the respective rotational position of the thread inlet tube (4) and thus the dependent of the height position of the upper brake surface ring (6), set braking force.

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