EP1317393B1 - Disk brake - Google Patents

Abstract

The invention relates to a disk brake (B) for a thread (Y). Said disk brake has a run-in disk (E) which can be pressed against a stationary run-out disk (A) under the influence of a magnet (M), with a circular braking surface (2). The run-out disk (A) has a central run-out opening (16) for the thread (Y), which is braked between the braking surfaces (2, 14) which are oriented radially in relation to the brake axis (X). The run-in disk (E) is held in the nose area of a storage drum (D) of a thread storage device (F), in a manner that allows the disk to wobble, while the magnet (M) and the run-out disk (A) are held in a stationary support (S). The invention provides that the run-in disk consists of magnetic material and the magnet (M) acts on the run-in disk (E) magnetically through the run-out disk (A), so that the braking force that is exerted on the thread between the braking surfaces can be adjusted and varied.

Description

The invention relates to a disk brake specified in the preamble of claim 1 Art.

In the known from EP 0 519 970 A (WO91 / 14032), so-called axial disk brake in the trigger-side nose region of the storage drum of the thread storage device is the inlet plate in the direction of pressure to the storage drum rigid or yielding supported. The coaxial outlet plate is axially against the inlet plate by a spring pressed and is guided axially movable. With the spout plate is in the embodiment the controlled disk brake connected to an axial coil, which in one arranged in the support electromagnet is arranged and influenced by this is to act on the outlet plate against the force of the spring loading it and in this way the braking force for the thread quickly and remotely controlled to vary. In the uncontrolled embodiment of the disk brake is the bias the spring loading the outlet plate with a manual adjusting device to change in the support. The withdrawn from the storage drum Thread rotates when entering between the braking surfaces like a clock hand and is after braking between the braking surfaces in the outlet opening of the outlet plate axially deflected and further deducted. Due to the essentially radial inlet the pointer-like rotating thread and its axial spout is an extraordinary achieved effective self-cleaning effect of the disk brake. The construction of the disk brake However, it is multi-part and technically complex. The response of the plate brake on the varying loading of the coil is so sensitive that the Braking force even during an entry process in a loom exactly reproducible can be varied.

In the case of axial disk brakes known from US Pat. No. 6,095,449 (FIGS. 23, 24), respectively Outlet plate mounted axially movable. The movably mounted spout plate is either by a positioned behind the fixed inlet plate magnet against pulled the inlet plate, or pressed by a spring against the fixed inlet plate, wherein the force of the spring acting through a the outlet plate Magnet is modulated.

There are known from DE-A-195 38 138 plate brakes, in which the thread between the pressed against each other circular braking surfaces of the plate linear and in passes through the contact plane of the braking surfaces. The braking force is mechanical or adjustable by means of at least one electromagnet which is mounted on at least one of Plate interacts magnetically. Due to the straight thread pass in the contact plane the brake surfaces tends this plate brake for rapid soiling, because lint is stripped and collected. This affects the response and the function of the disk brake, especially if the braking force during a Entry process must be varied.

Controlled multiple disc brakes (e.g., WO98 / 45201) are also known in practice. in which at least one electromagnet the contact pressure between the braking surface varies on the lamella and a counter-braking surface depending on the current applied. Again, the thread runs straight through, so that the multi-disc brake for rapid Dirt by depositing and collecting lint tends.

The invention is based on the object, a sensitive and precise controllable disk brake of the type mentioned above, while maintaining the good and effective self-cleaning effect is structurally simpler designed.

The stated object is achieved with the features of claim 1.

In departure from the known concept of the axial plate brakes of the outlet plate is stationary arranged and the inlet plate made of magnetic material. The magnet, the outlet side is kept stationary under the outlet plate acts through the outlet plate magnetically on the inlet plate to the braking force or the contact pressure to create between the braking surfaces. The plate brake is structurally simple because of Inlet plate represents the only moving part; and the stationary outlet plate forms a cuff-proof conclusion. With the thread running, between the braking surfaces How a clock wheel rotates around the brake axle depends on the thread thickness and the effective loading force of the magnet of the inlet plate stimulated the thread to a tumbling motion, in which the thread a gap between the braking surfaces opens, with the wobbling movement of the inlet plate with the Thread runs around. The inlet plate rolls on the spout plate, so to speak, where he each supported diametrically opposite the thread. Out of this function results a self-compensation effect of the disk brake, which manifests itself in that with increasing thread speed or with strong thread acceleration the Braking effect of the disk brake decreases and despite the higher speed or strong acceleration that Level of tension in the thread downstream of the plate brake is not appreciably raised becomes. The self-compensation effect is desirable because the disk brake at high thread speed or strong thread acceleration a lower Contribution to the anyway by the high thread speed or the strong acceleration increasing thread tension should, as at low thread speed or lower acceleration, so that overall the thread tension level remains relatively constant. One cause of the self-compensation effect is presumably that with increasing speed or with strong thread acceleration the kinematics and also force components exerted by the thread on the inlet plate, the gap formed in the tumbling movement larger or in the circumferential direction is extended. This automatically reduces the resistance that accompanies the thread counteracts its circulation movement and inlet movement between the braking surfaces. Thanks to the pointer movement of the running thread between the braking surfaces and the axial withdrawal movement through the outlet openings is forcibly created an intense self-cleaning action, so that the plate brake among the unavoidable occurring lint from the thread material their functionality unchanged maintains. In addition, the disk brake is able to spot thickening in places or knot without damage to the thread without passing that the braking effect changes noticeably.

In the controllable disk brake according to claim 2, the braking effect can be electronically extremely fast and accurate, even during a picking cycle of the thread. As the spout plate and the spout channel during the operation the disk brake do not perform any movements, if necessary form the outlet plate and the outlet channel end-sided and inside linings of an iron core of the stationary electromagnet. At least the spout plate can be part of it, so to speak be the electromagnet, whereby this positionable very close to the inlet plate is and favorable conditions for the transmission of magnetic forces on the inlet plate available. In addition, so protects the outlet plate (possibly together with the outlet pipe) the electromagnet against contamination, and is a compact design possible.

To gently transfer the braking power for the thread, it is expedient to Braking surfaces as radially oriented to the brake axis, at least approximately the same width Form annular surfaces. Alternatively, the braking surfaces could also be very thin beads on the plates (almost with line contact), possibly even several concentric beads.

Convex rounded edge areas of both plates form an approximately V-shaped closing, circular inlet area to the braking surfaces. In the edge area of the Einlauftellers, the thread in the opening direction of the disk brake force components submit. This can assist the self-compensation effect.

An aligned on the braking surface of the inlet plate, circumferential gap in the soft iron core the magnet becomes, so to speak, through the braking surface of the inlet plate or the inlet plate itself magnetically closed, creating a precisely controllable Transmission of magnetic forces on the inlet plate is possible.

In an uncontrolled embodiment of the disk brake, the magnet is a permanent magnet, which pulls the inlet plate against the outlet plate. Conveniently, If the permanent magnet is a neodymium permanent magnet.

To be able to adjust the braking effect of the disk brake manually, the Outlet plate be supported for stationary, the permanent magnet, however, in Direction of the brake axis its axial distance from the inlet plate be adjustable. For this purpose, an adjustment in the seal is appropriate, the easily reproducible setting of the braking effect by adjusting the Permanent magnets executes and the permanent magnet in the support in his Determines work position.

Structurally simple is the inlet plate on a holding element of the storage drum of the Thread storage device movably mounted. In normal operation of the disk brake, i.e. with the wobbling movement of the inlet plate becomes thanks to the game of the inlet plate no significant disturbing force is effective on the holding element. If necessary. the holder works as centering, or is additionally provided a centering for the inlet plate.

Structurally simple, the inlet plate is secured with a headed bolt, whose head is in a central recess of the inlet plate is recovered to the threadline not to to disturb. Optionally, the recess is closed by a cover to Prevent lint buildup.

A favorable thread geometry is with a conical shaped nose of the storage drum achieved. The thread follows the taper of the nose and occurs relatively low in resistance between the braking surfaces. Due to its inclination in relation to Brake axis it exerts on the inlet plate an opening force component, which may be favorable for the self-compensation effect. However, it is also possible running the yarn in approximately radially between the braking surfaces, i. the nose the storage drum not conical, but plan to form. Also a bow-shaped Curvature of the nose is conceivable.

At least the braking surfaces should have a wear-resistant coating, or consist of a correspondingly wear-resistant material. For example Can for the spout plate an aluminum alloy with a plasma coating be used. The inlet plate may e.g. made of steel, at least in the area of its braking surface.

Both plates should be as solid as possible. It would be conceivable, however, the central area form the enema plate elastically deformable to the tumbling motion to facilitate in storage and yet to center.

The electromagnet adjusts the instantaneous braking force and also takes on variations the braking force by changing the current applied to the solenoid is generated by the electronic control device.

Fig. 1

einen Achsschnitt einer im Nasenbereich einer Speichertrommel eines Fadenspeichergeräts angeordneten, elektromagnetisch steuerbaren Tellerbremse,

Fig. 2

einen Achsschnitt einer ungesteuerten magnetischen Tellerbremse, und

Fig. 3

eine Seitenansicht eines Fadenspeichergeräts mit integrierter Tellerbremse.

Reference to the drawings, an embodiment of the subject invention will be explained. Show it:

Fig. 1

an axial section of a arranged in the nose region of a storage drum of a yarn storage device, electromagnetically controllable disk brake,

Fig. 2

an axial section of an uncontrolled magnetic disk brake, and

Fig. 3

a side view of a yarn storage device with integrated disk brake.

The disk brake B shown in Fig. 1 contains a main components in one Support S stationarily arranged, circular outlet plate A, an adjoining, also circular inlet plate E, which is substantially concentric with each other are arranged and define a brake axis X, and a magnet M within the support S. The inlet plate E is at the front end of a nose 8 a Storage drum D of a yarn storage device F shown in Fig. 3 about the brake axis X staggered stored. The inlet plate E is made of magnetic material, e.g. Steel, is thin-walled and light in weight. The outside diameter both plates A, E are approximately equal and substantially smaller than the outer diameter a storage surface 10 of the storage drum D. The yarn Y is on the storage surface 10 stored in consecutive turns 11 and a rounded or conical withdrawal edge 12 away along the nose 8 withdrawn, wherein the Y-thread on the trigger rotates clockwise about the X-axis. In the Tellerbremse B, the yarn Y is initially radial to the brake axis during the pointer movement X oriented and only inwardly deflected in the disk brake B in the axial direction and subtracted (axial disk brake), for example, from a not shown Entry device of a loom.

The inlet plate E has a concentric and oriented radially to the brake axis X. Section 1, which defines an annular and flat braking surface 2. Outside the braking surface 2, the edge region 3 of the inlet plate E is rounded concave. In the middle region of the inlet plate E is a receding recess 4 with a central bore 5 into which a holding element, e.g. a head bolt 6, 7 the nose 8 engages so that the larger outer diameter than the inner diameter the bore 5 formed head 7 without contact with the inlet plate E in the recess 4, when it rests on the outlet plate A. Conveniently, is formed in the nose 8, a recess 9 for accommodating the inlet plate E. Between the bore 5 and the shaft 6 of the head bolt 6, 7 is an all-round Game 5a provided. Possibly. is a not shown centering Z for the inlet plate E provided to this during its tumbling movement to the brake axis X too Center.

The outlet plate A has a radially oriented to the brake axis X section 13, one of the braking surface 2 facing, also annular and level Braking surface 14 defined The outer edge region 15 of the spout plate A can be concave be rounded. In the middle region of the outlet plate A is an outlet opening 16th formed, which continues in an outlet channel 17 (thread tube), the centrally through the magnet M runs. In the outlet opening 16, a suture eyelet 18 is positioned. Appropriately, a thread eyelet 18 is also positioned at the end of the outlet channel 17.

In the controllable disk brake B shown in FIG. 1, the magnet M is an electromagnet M with an insulating sheath 20 for at least one magnetic coil 19, which is surrounded by a soft iron core 21 The soft iron core 21 has, the Outlet plate A facing, a circumferential open gap 22 on the braking surface 2 of the inlet plate E is aligned. The magnetic coil 19 is connected to an electronic Control device C connected in either the support S or at the not shown control device of the thread storage device or in an external Position can be arranged and the current applied to the solenoid coil 19th controls.

The spout plate A forms in the controlled disc brake B in Fig. 1 a end face Covering the soft iron core 21 of the electromagnet M, thus the task the stationary positioning of the outlet plate A takes over. The outlet channel 17 (Thread tube) forms an inner lining of a central bore of the electromagnet M. The soft iron core 21 is in the support 24 in a tubular approach 23 positioned.

The rounded edge regions 3, 15 of the plates A, E form a circumferential inlet region 25 for the yarn Y, which is approximately V-shaped to the braking surfaces 2, 14th narrows.

The spout plate A consists for example of an aluminum alloy and is at least provided on the braking surface 14 with a wear-resistant coating, e.g. a plasma coating. The magnetic material of the inlet plate E is Any type. Conveniently, at least the braking surface 2 with a provided wear-resistant coating or is the material of the inlet plate E wear-resistant.

In operation of the controlled disk brake B in Fig. 1, a certain contact force between the braking surfaces 2, 14 is adjusted by means of the electromagnet M _E and optionally varied depending on the consumption cycle of the yarn Y. The withdrawn yarn Y brings thanks to its pointer-like orbital movement the inlet plate A in a tumbling motion about the brake axis X, the extent of which depends on the thread thickness and optionally the thread speed. The frequency of the wobble coincides with the frequency of the turns of the thread in its pointer movement. The braking surface 2 of the inlet plate E is released only in the inlet region of the yarn Y from the braking surface 14 of the outlet plate A, while the braking surfaces remain diametrically opposite in contact. With increasing thread speed or with increasing thread acceleration, the braking surface 2 is more ventilated at the inlet region of the yarn Y from the braking surface 14, whereby a self-compensation effect sets, thanks to the braking effect at higher thread speeds and strong thread acceleration automatically decreases even with unchanged magnetic loading.

In FIG. 2, an uncontrolled embodiment of the disk brake B is shown. In contrast to the embodiment of the controlled disk brake B in FIG. 1, the magnet M in FIG. 2 is a permanent magnet M _P , for example a ring-shaped neodymium permanent magnet placed in the soft iron core 21 a constant magnetic tensile force through the outlet plate A passes through the inlet plate E. However, since the tensile force acting on the inlet plate E depends on the distance between the permanent magnet M _P and the inlet plate, the braking effect of this uncontrolled disc brake can be changed by changing the axial distance of the permanent magnet M _P from the inlet plate E. For this purpose, the permanent magnet M _{P is held} together with its surrounding soft iron core 21 by means of an adjusting device 29 in the support S, and the spout plate A is fixed for itself in the tubular part 23, for example at 27 in a press fit or by soldering, gluing or The adjustment device 29 consists of an externally threaded tube extension 30 on the soft iron core 21 and a tubular part 23 rotatably mounted adjusting screw 31 with an internally threaded portion. Further, a detent 33 may be provided to index the set values for the axial position of the permanent magnet M _p . A rotation lock 32, 32 'prevents co-rotation of the permanent magnet Mp and the soft iron core 21 during adjustments. In a simpler embodiment, however, the permanent magnet M _P could also be screwed axially to the soft iron core 21 directly in the interior 28 of the support S. In Fig. 2, the permanent magnet M _P and the Weicheisenkem 21 is shown in a retracted setting position, from which it can be further back or until it rests in contact with the rear side of the spout plate forward. Further, dash-dotted an elastic means, such as a compression spring, indicated at 26, which acts on the inlet plate in the outlet plate A. This resilient device could also have a dampening effect. The holder of the inlet plate in the nose 8 could be simultaneously formed as a centering to center the inlet plate E in its tumbling movements on the brake axis X. Optionally, however, a separate centering device (not shown) is provided for this purpose, which acts either centrally or on the outer circumference of the inlet plate. These could be, for example, circumferentially distributed stops or pins.

In Fig. 3, the thread storage device F is in a side view with integrated disk brake B (either the embodiment of Fig. 1 or that of Fig. 2). One Housing H of the thread storage device F carries a boom 34 to which the support S is appropriate. The storage drum D is for example of interlocking Rod cages defined for the purpose of a thread separation of the turns 11 are movable relative to each other. The thread is driven by means of a rotation Winding 35 wound on the storage drum D and, at least in the illustrated embodiment of the thread storage device in Fig. 3, by pulled a further yarn brake B1 through the nose 8 in the disk brake B. The further yarn brake B1 not only has a balloon-limiting function, but is also useful to a clean thread control in the thread movement from the turns 11 in the disk brake B (clockwise movement) with relatively perform low braking effect.

Claims (13)

1. Disk brake for a yam (Y) comprising a first circular inlet disk (E) defining a not deformable braking surface (2), and a second coaxial circular outlet disk (A) defining a not deformable braking surface (14), the outlet disk (A) having a central outlet opening (16) situated in a brake axis (X), the braking surfaces (2, 14) which are oriented radially with respect to the brake axis (A) being adapted to be pressed by a pressing force against each other under the influence of an annular magnet (M) which surrounds an axial outlet channel (17), the braking surfaces (2, 14) being bounded by an inlet region (25) distant from the brake axis (X) for the yam (Y) which is rotating during the substantially radial inlet movement like the pointer of a clock between the braking surfaces, the outlet opening (16) being connected with the outlet channel (17) provided for the yam (Y) which has been braked between the braking surfaces (2, 14) and which is axially deflected at the outlet disk (A) into the outlet opening (16), the inlet disk (D) being supported for a wobbling motion around the brake axis (X) in the nose region (8) of a stationary storage drum (D) of yam storing device (F),the magnet (M) and the outlet disk (D) being provided in a stationary support (S) such that the brake axis (X) at least approximately coincides with the drum axis (X1) and such that the braking surfaces (2, 14) are of smaller outer diameter than the storage drum (D), characterised in that the outlet disk (A) which is deflecting the yam (Y) is arranged stationarily, that the inlet disk (E) consists of magnetic material, and that the magnet (M) magnetically acts upon the inlet disk (E) through the outlet disk (A) and is pulling the inlet disk (E) against the outlet disk (A).
2. Disk brake as in claim 1, characterised in that the magnet (M) is an electromagnet (M_E) the attracting force of which is acting on the inlet disk (A) is adjustable, and that, preferably, the outlet disk (A) and the outlet channel (17) are linings on the front side and the inner side of a soft iron core (21) of the electromagnet (M_E).
3. Disk brake as in claim 1, characterised in that the braking surfaces (2, 14) are circular ring surfaces which are at least substantially of equal width and which are oriented radial to the brake axis (X).
4. Disk brake as in claim 1, characterised in that edge portions (3, 15) of both disks (A, E) are rounded convexly outside of the braking surfaces (2, 14) and form the inlet region (25) with a cross-section which terminates about V-shaped.
5. Disk brake as in claim 1, characterised in that a soft iron core (21) of the magnet (M) is provided with a circumferentially continuous gap (22) which axially faces the braking surface (2) of the inlet disk (E).
6. Disk brake as in claim 1, 3 or 5, characterised in that the magnet (M) is a permanent magnet (M_P), preferably a neodymium-permanent magnet.
7. Disk brake as in claim 6, characterised in that the outlet disk (A) is stationarily supported by itself, and that the permanent magnet (M_P) is adjustable in the direction of the brake axis (X) and in the axial distance to the inlet disk (A).
8. Disk brake as in claim 1, characterised in that the inlet disk (E) has a central bore (5) within its braking surface (2) into which bore a holding element engages with a clearance (5a), the holding element being fixed to the storage drum, preferably a headed bolt (6, 7) which is provided in the nose (8) of the storage drum (D) and extends through the bore (5), the head (7) of which is positioned in a central depression (4) of the inlet disk (E).
9. Disk brake as in claim 1, characterised in that at least the braking surfaces (2, 14) are provided with a wear-proof coating, e.g. a plasma-coating.
10. Disk brake as in claim 2, characterised in that the electromagnet (M_E) is connected to an electronic control device (C) for adjusting and/or varying the current supply for at least one magnet coil (19) placed in the soft iron core (21).
11. Disk brake as in claim 1, characterised in that the inlet disk (D) is loaded in resilient fashion (26) against the outlet disk (A).
12. Disk brake as in at least one of the preceding claims, characterised in that the outlet disk (A) forms a lint-proof cover for the interior space (28) of the support (S) containing the magnet (M), and that the outlet disk (A), preferably, has a continuous outlet channel (17).
13. Disk brake as in at least one of the preceding claims, characterised in that a centring (Z) is provided for the inlet disk (E).

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