US3060672A - Internal brake for spinning and twist spindles - Google Patents

Description

Oct. 30, 962 A. KRESSLEIN ETAL 3,060,672

INTERNAL BRAKE FOR smmmc AND TWIST SPINDLES Filed March so, 1961 s Sheets-Sheet 1 Oct. 30, 1-962 A. KRESSLEIN ETAL 3,060,672

INTERNAL BRAKE FOR SPINNING AND TWIST SPINDLES Filed March 30, 1961 5 Sheets-Sheet I Inventor's W f W 2 Oct. 30, 1962 A. KRESSLEIN ETAL 3,060,672

INTERNAL BRAKE FOR SPINNING AND TWIST SPINDLES Filed March 30, 1961 3 Sheets-Sheet 3 i I g2 219 I7 26 2/ 27 29 I 20 1 1 x l l )5 2 62 I 1 25 ffiVQffiO/"S tates tet 3,060,672 Patented Oct. 30, 1962 fibre 3,060,672 INTERNAL BRAKE FOR SPINNING AND TWIST SPINDLES Albert Kresslein and Heinz-Gunther Wiechmann, Krefeld, Germany, assignors to Volkmann & Company, Krefeld, Germany, a partnership Filed Mar. 30, 1961, Ser. No. 99,490 Claims priority, application Germany Apr. 1, 1960 Claims. (CI. 57-88) The present invention relates to an internal brake for spinning and twist spindles.

It is known to provide spinning and twist spindles with internal brakes which permit each spindle to be separately stopped, whilst the driving belt common to all the spindles remains in engagement with the spindle that has been braked. In known forms of construction the members which carry the braking surfaces are located in the hollow interior of the wharve (whorl). They either take the form of defiectable shoes or of radially expandable friction members. Their functional operation requires a relatively large amount of space. Consequently the cavity available inside the wharve is insuilicient for the accommodation of the necessary parts. It is therefore the practice to provide the wharves with a downward extension in the form of a hollow collar of larger diameter. Although this permits the deflectable or expanding members of the brake to be accommodated in the radial direction the axial length of the spindle is considerably extended and this is accentuated by the fact that the actuating elements can only partly find room in the hollow collar of the wharve.

In order to overcome these drawbacks it is desirable to accommodate an internal brake inside the wharve without the need of enlarging the wharve by the provision of a special collar. Although this necessitates the provision of parts of small external diameter for the brake the braking surface must nevertheless be kept sufliciently extensive to allow for a satisfactory dissipation of the frictional heat.

The present invention solves this problem by providing coaxial eccentric rings. The inner of these eccentric rings is fast on the bearing sleeve of the twist spindle and has a periphery which is eccentric in relation to the spindle axis. Movably embracing this inner ring is an outer ring with an inner periphery which is conformably eccentric to the spindle axis. The outer periphery of this ring carries the brake lining and this brake lining can be brought into contact with the inside periphery of the wharve by rotating the outer ring.

The diameter of such an internal brake can be small because it lacks parts that require pivotal deflection or expansion. The provision of a collar on the wharve can thus be dispensed with. The overall structural height of the spindle is less and its manufacture is simpler. The braking is adequate, especially if two pairs of rings are provided in axial adjacency. If the eccentricities of the two pairs of rings are diametrically opposed, then the braking action will also be uniform without ill efiects on the bearings.

Actuation of the brake is by means of a coaxial actuating ring which radially and axially likewise requires a minimum of space, as do the other parts of the brake.

The accompanying drawings illustrate embodiments of the invention. In these drawings FIG. 1 is a vertical section of the lower part of the wharve, all elements which are not relevant to the invention being omitted;

FIG. 2 is a horizontal section which illustrates the? general scheme,

FIG. 3 is a horizontal section taken on the line A-A in FIG. 1.

FIG. 4 is an alternative embodiment of the actuating means in vertical section, and

FIG. 5 is a section taken on the line B-B in FIG. 4.

The spindle shaft 1 is mounted in conventional manner inside a sleeve 2. The wharve 3 is fast on this shaft 1. The wharve 3 is driven by a belt 4 which travels in a direction normal to the plane of the paper and rotates the wharve and hence the shaft.

The wharve 3 is of hollow construction for the reception in its interior of the brake. The internal cavity has a uniform internal diameter. There is no axial or radial enlargement in the form of a collar for accommodating the internal brake.

The brake comprises an inside ring 6 which is secured to sleeve 2 for instance by means of a grub screw 7, and which cannot therefore rotate. Rotatably embracing ring 6 is an outer ring 8.

In the illustrated example two such pairs of rings are mounted in axial adjacency. In the second pair of rings the inner ring is marked 6' and the outer rings 8', whereas the associated grub screw is indicated at 7'.

FIG. 2 illustrates the manner in which one such pair of rings functions. The inner ring 6 has an internal periphery which is concentric about the spindle axis, whereas its outer periphery is eccentric thereto. The outer ring 8 is rotatable about this eccentric outer periphery, so that its internal periphery is likewise eccentric to the spindle axis. The outer periphery of this latter ring forms the braking surface 9 proper of which only a seetion theoretically only a line-makes contact with the inside periphery 10 of wharve 3 when ring 8 is rotated in the direction of the arrow shown in FIG. 2 and the position of the thick parts of the rings 6 and 8 coincide. Ring 8 may consist throughout of a frictional material, or it may be made of steel with a brake lining.

The second pair of rings is constructed in analogous manner, excepting that the eccentricity of the latter is angularly displaced in relation to that of the first pair hrough an angle of If desired more than two pairs of rings may be provided with eccentricities angularl'y evenly distributed around the entire circumference. The brake is actuated by an entraining ring 11 which is rotatably mounted on sleeve 2. The outer rings 8 and 8 are formed with projections 12 and 12' which engage conformable recesses 13 in ring 11, so that the rings 8 and 8' will be entrained when the entraining ring 11 is rotated. The ring 11 is movable by means of a sliding member 14 engaging projections 15 on ring 11. The sliding member extends axially upwards from an inverted dish 16 to which it is attached. The dish carries a lever handle 17. The actuating ring 11 which is thus coupled with handle 17 should preferably be spring-biased in such manner that the brake is automatically freed whenever it has been engaged.

One possible form of construction for this purpose is illustratively shown in FIG. 4 which in its essential details corresponds with FIG. 1. is axially extended, and one end of a spirally coiled spring 18 is attached to this extension, the other end of this spring being attached to the ring 6 which is secured to the stationary bearing sleeve 2 of the spindle. In the illustrative embodiment ring 6 is likewise upwardly extended to permit the said spring 18 to be attached thereto. During the application of the brake spring 18 is energised beyond its normal bias and can therefore restore the braking rings to their original positions when handle 17 is released.

In order to retain handle 17 and the members of the brake in braking position whilst attention is given to the spindle it is preferred to provide a ratchet locking mechanism for instance of the kind shown in FIG. 5. Fulcrumed on a pin '20 in the lever handle 17 is a ratchet The sliding member 14 pawl 19 which is biased by the pressure of a compression spring 21 urging the tooth 22 of the pawl into engagement with ratchet teeth 23 formed on the spindle flange 24. Furthermore, an actuating stud 25 is provided which is formed with a collar 26 arranged to co-operate with an inclined face 27 on pawl 19. For restoring the stud 25 into normal position a spring stop 23 is provided.

This arrangement functions as follows: For engaging the brake the lever handle 17 is deflected in the direction of arrow 29. This causes pawl 19 to engage the ratchet eeth 23. When it is desired to release the brake, stud 25 is held depressed in the direction of arrow 30 against the pressure of the spring stop 28 causing the collar 26 to deflect pawl 19 out of engagement with the ratchet teeth. The spiral spring 18 then returns all the movable brake parts to the original position. At the same time the button '25 bears against spring stop 28 which returns the button, when this is released, from the position shown in dotted lines to its former full line position.

It may be desirable to subdivide the large ratchet tooth divisions by using several pawls 19 with toothed ends of different lengths, so that the brake will always be retained in effective braking position even when the braking surfaces are progressively subjected to wear.

The same etfect is achieved by the provision of a spring 31 (FIG. 3) between the sliding member 14 and the limit stops 15 on the entraining ring 11.

What we claim is:

1. An internal brake for a spinning or twist spindle comprising a twist spindle member, a bearing sleeve therefor and a wharve, said brake comprising at least one pair of co-axial inner and outer rings, the inner ring being fast on the said bearing sleeve and having an outer periphery which is eccentric to the spindle axis, the outer ring having a similarly eccentric inner periphery embracing the inner ring, the outer periphery of the said outer ring providing the braking surface and means for turning the outer ring on the inner ring to move said braking surface into contact with the inside peripheral surface of the said wharve.

2. A brake according to claim 1 comprising at least two axially adjacent pairs of said rings placed with their eccentricities relatively angularly displaced.

3. A brake according to claim 1 comprising two axially adjacent pairs of said rings placed with their eccentricities relatively angularly displaced by 180.

4. A brake according to claim 1, said means comprising a co-axial entraining ring to serve as a brake-actuating ring.

5. A brake according to claim 1 comprising axially adjacent said pairs of rings with their eccentricities relatively angular-1y displaced for equalising braking torque and a co-axial brake-actuating ring, and means coupling said brake-actuating ring to the outer rings of the said pairs.

6. A brake according to claim 1 comprising a brakeactuating ring means having a lever type control handle and comprising spring-biassing means for returning the brake to inoperative position.

7. A brake according to claim 1 comprising a brakeactuating ring means and spiral spring return means between the said ring means and the said spindle-bearing sleeve.

8. A brake according to claim 1 comprising axially adjacent said pairs of rings with the eccentricity of one pair angularly displaced in relation to the eccentricity of the adjacent pair, ring means for displacing the said outer rings of the said pairs, said ring means comprising a part cylindrical member positioned between the inner periphery of the said wharve and the outer peripheries of said outer rings and coupled to said latter rings for simultaneously rotating them and a spiral spring means secured to the said member and secured in relation to the said bearing sleeve for returning the said outer rings when the braking is released.

9. A brake according to claim 8 comprising means for retaining said ring means and the said outer rings in braking position comprising a ratchet locking mechanism, said mechanism including at least one pawl pivoted to said ring means, spring means biasing said pawl to engage the ratchet of said mechanism, and means slidable with respect to the said ring means for releasing said pawl from said ratchet.

10. A brake according to claim 1 comprising a brakeactuating ring means and spring returning means between said ring means and the said bearing sleeve and compris' ing at least one stud-controlled locking pawl which engages ratchet teeth on a flange of the spindle.

References Cited in the file of this patent UNITED STATES PATENTS 2,533,162 Boyden Dec. 5, 1950

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