US20020088674A1 - Brake for an open-end spinning rotor - Google Patents
Brake for an open-end spinning rotor Download PDFInfo
- Publication number
- US20020088674A1 US20020088674A1 US10/041,421 US4142102A US2002088674A1 US 20020088674 A1 US20020088674 A1 US 20020088674A1 US 4142102 A US4142102 A US 4142102A US 2002088674 A1 US2002088674 A1 US 2002088674A1
- Authority
- US
- United States
- Prior art keywords
- brake
- rotor
- open
- brake lining
- lining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000007383 open-end spinning Methods 0.000 title claims abstract description 17
- 229910000906 Bronze Inorganic materials 0.000 claims abstract description 8
- 239000010974 bronze Substances 0.000 claims abstract description 8
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000009987 spinning Methods 0.000 description 8
- 229920000049 Carbon (fiber) Polymers 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000004917 carbon fiber Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
- D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
- D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
- D01H4/12—Rotor bearings; Arrangements for driving or stopping
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H7/00—Spinning or twisting arrangements
- D01H7/02—Spinning or twisting arrangements for imparting permanent twist
- D01H7/04—Spindles
- D01H7/22—Braking arrangements
Definitions
- the present invention relates generally to brakes for open-end spinning rotors and, more particularly, to such a brake for a spinning rotor which rotates at a high speed in a rotor housing and is rotatably supported by its rotor shaft in the bearing nip of a support-disk bearing and wherein the brake comprises at least one brake lever having a brake lining that can be placed on the rotor shaft upon actuation of the brake.
- Open-end rotor spinning devices of the above-indicated type with braking devices that act on the rotor shaft of the spinning means are known in various embodiments and have long been known in the state of the art.
- German Patent Disclosure DE 36 30 256 A1 discloses a brake for an open-end spinning rotor wherein the brake comprises a brake lever, having a brake lining, that can be adjusted from below against the rotor shaft and wherein the brake comprises two press pads with cheeks similar to brake linings which pads act from above on the rotor shaft.
- the cheeks of the press pads have a different coefficient of friction than the brake lining arranged on the brake lever.
- German Patent Disclosure DE 38 20 328 C2 teaches a rotor brake with tong arms arranged with specular symmetry. Each of the tong arms comprises an asbestos-free brake lining on the end. When the brake is actuated, the brake linings are placed on the rotor shaft at the same time, bringing the spinning rotor rotating at a high speed during the spinning operation to a standstill.
- Such smooth brake linings have a significantly adverse effect on the operation of the brake since they result in distinctly longer braking times and a measurable loss of efficiency of the entire open-end spinning machine.
- the service units of the spinning-start carriage as well as the open-end spinning device could experience significant damage.
- brake linings consisting of a carbon fiber composite material have the disadvantage of being relatively more expensive.
- the present invention addresses this objective by providing a brake for an open-end spinning rotor that rotates at a high speed in a rotor housing and is rotatably supported by a rotor shaft in a bearing nip of a support-disk bearing.
- the brake comprises at least one brake lever having a brake lining manufactured from sintered bronze. The brake lever can be placed on the rotor shaft upon actuation of the brake.
- brake lining of sintered bronze has the advantage that such a material is extremely resistant to temperature changes and also exhibits a very high wear resistance. Since brake linings of sintered bronze are, in addition, considerably more economical to manufacture than brake linings of carbon-containing material. Such brake linings have the advantages of the known brake linings without their disadvantages. For example, surface changes do not occur in brake linings of sintered bronze, even after a rather long run time, so that it is assured that the rotor brakes of the open-end spinning machine have a uniformly high braking action over their entire service life at a reasonable cost.
- the brake linings can preferably be fixed via a screw bolt and a fastening nut in a readily replaceable manner to the associated brake levers so that when needed a worn brake lining can be removed simply by loosening the screw bolt without problems and replacing it with a new brake lining.
- the brake lining has a downward-opening fastening slot into which a centering extension of the fastening nut fits in the assembled state. That is, the brake lining can be simply drawn up by the brake lever for replacement after the screw bolt has been loosened, during which the screw bolt and the fastening nut remain in their assembled state. The assembly of the new brake lining proceeds just as simply. In this instance, the brake lining is lowered with its fastening slot from above, over the screw bolt, and the centering extension of the fastening nut and the screw bolt is subsequently retightened.
- FIG. 1 is a schematic view of an open-end rotor spinning device with a tong-like rotor brake as well as with brake linings detachably arranged on the brake levers and manufactured from sintered bronze.
- FIG. 2 is an enlarged view of a brake lever with a brake lining in accordance with the present invention.
- FIG. 3 is a front view of a brake lining with fastening nut in accordance with the present invention.
- FIG. 4 is a side view of the brake lining according to FIG. 3.
- the open-end rotor spinning device 1 shown in FIG. 1 is equipped with a known spinning means, a so-called spinning rotor (not shown in detail), which is rotatably supported by its rotor shaft 2 in bearing nip 3 of support disk bearing 4 .
- Such a support disk bearing typically comprises two support disk pairs with front and rear support disks 7 connected via shaft 5 in such a manner as to rotate in unison, which shaft is rotatably supported in roller bearings 6 such as ball bearings.
- rotor brake 8 is in the form of a tong having arms which can be positioned on rotor shaft 2 .
- the tong arms of rotor brake 8 are designed as brake levers 9 , 10 that are supported in pivot shafts 11 , 12 in such a manner that they can rotate in a limited manner and are urged by an interposed spring element 25 into an open non-braking position.
- brake levers 9 , 10 each have a bearing 13 on the end.
- Brake lining 16 manufactured from sintered bronze is fastened in a replaceable manner to these bearings 13 via screw bolt 14 and fastening nut 26 .
- Brake levers 9 , 10 each have sliding surface 18 on their end opposite brake lining 16 . Sliding surfaces converge toward one another in the assembled state.
- roller-like pressure element 19 contacts sliding surfaces 18 , which element 19 is mounted so that it can shift in direction B and at the same time move brake levers 9 , 10 counter to the force of spring element 25 in a braking direction toward contact with the rotor shaft 2 .
- Pressure element 19 is preferably fixed between the side walls of U-shaped actuating lever 20 which is mounted in a manner such that it can rotate in a limited manner about pivot axis 21 .
- leaf spring 22 is fastened to actuating lever 20 and comprises catch ring 23 on its end.
- An actuating linkage (not shown) contacts this catch ring 23 , which linkage is loaded in case of service by a movable service unit, a so-called spinning-start carriage, that automatically supplies the open-end rotor spinning devices.
- brake lining 16 is essentially rectangular when viewed from the front and the comers are rounded off. Moreover, downwardly-opening fastening slot 15 is located on the bottom of brake lining 16 , as shown in FIG. 4. Fastening nut 26 engages with its centering extension 17 into this fastening slot 15 in the assembled state. That is, brake lining 16 can be fixed in a non-positive manner on brake levers 9 , 10 by screw bolts 14 and associated fastening nut 26 and can therefore be readily removed from the particular bearing 13 if required and replaced by a new brake lining 16 .
Abstract
A rotor brake (8) for an open-end spinning rotor rotating at a high speed in a rotor housing. The open-end spinning rotor is rotatably supported by its rotor shaft (2) in the bearing nip (3) of a support-disk bearing (4). The rotor brake (8), which is preferably designed in a tong-like manner, comprises brake levers (9, 10) that can be placed on the rotor shaft (2) and comprise a replaceable brake lining (16) on their end. The brake lining (6) is manufactured from sintered bronze.
Description
- This application claims the benefit of German Application 10100524.5, filed Jan. 8, 2001, herein incorporated by reference.
- The present invention relates generally to brakes for open-end spinning rotors and, more particularly, to such a brake for a spinning rotor which rotates at a high speed in a rotor housing and is rotatably supported by its rotor shaft in the bearing nip of a support-disk bearing and wherein the brake comprises at least one brake lever having a brake lining that can be placed on the rotor shaft upon actuation of the brake.
- Open-end rotor spinning devices of the above-indicated type with braking devices that act on the rotor shaft of the spinning means are known in various embodiments and have long been known in the state of the art.
- For example, German Patent Disclosure DE 36 30 256 A1 discloses a brake for an open-end spinning rotor wherein the brake comprises a brake lever, having a brake lining, that can be adjusted from below against the rotor shaft and wherein the brake comprises two press pads with cheeks similar to brake linings which pads act from above on the rotor shaft. The cheeks of the press pads have a different coefficient of friction than the brake lining arranged on the brake lever.
- Moreover, German Patent Disclosure DE 38 20 328 C2 teaches a rotor brake with tong arms arranged with specular symmetry. Each of the tong arms comprises an asbestos-free brake lining on the end. When the brake is actuated, the brake linings are placed on the rotor shaft at the same time, bringing the spinning rotor rotating at a high speed during the spinning operation to a standstill.
- However, these known rotor brakes have the disadvantage that the service life of such brakes is relatively limited on account of the high loading of the brake linings. That is, the frictional heat produced during the braking procedure allows the brake linings, that consist of a metallic, fiber-reinforced material bound to an artificial resin and free of asbestos and solvent, to become smooth in time in the area of their contact site with the rotor shaft.
- Such smooth brake linings have a significantly adverse effect on the operation of the brake since they result in distinctly longer braking times and a measurable loss of efficiency of the entire open-end spinning machine. In addition, there is always the danger in the case of smooth brake linings that the spinning-start carriage supplying the open-end spinning machine might stop at a spinning head whose spinning rotor has not yet been completely braked. In this instance, the service units of the spinning-start carriage as well as the open-end spinning device could experience significant damage.
- In order to eliminate the above-described disadvantages, the use of brake linings consisting of a carbon fiber composite material has therefore already been suggested.
- As disclosed in German Patent Disclosure DE 198 02 655 A1, such carbon fiber composite materials have the great advantage that they are extremely resistant to temperature changes and, in addition, have a very high wear resistance. Thus, in the case of brake linings consisting of carbon-containing material, the disadvantage of surface changes known from practice does not occur even after a rather long run time, so that such brake linings assure that the rotor brake always has a uniformly high braking action over its entire service life.
- However, brake linings consisting of a carbon fiber composite material have the disadvantage of being relatively more expensive.
- It was not possible in the past to manufacture brake linings from a carbon fiber composite material at a price that justified a serious use of such brake linings in textile machines.
- It is accordingly an object of the present invention to improve the rotor brakes of an open-end spinning machine, especially their brake linings.
- The present invention addresses this objective by providing a brake for an open-end spinning rotor that rotates at a high speed in a rotor housing and is rotatably supported by a rotor shaft in a bearing nip of a support-disk bearing. The brake comprises at least one brake lever having a brake lining manufactured from sintered bronze. The brake lever can be placed on the rotor shaft upon actuation of the brake.
- Further advantageous embodiments of the present invention are set forth in more detail herein.
- The use of a brake lining of sintered bronze has the advantage that such a material is extremely resistant to temperature changes and also exhibits a very high wear resistance. Since brake linings of sintered bronze are, in addition, considerably more economical to manufacture than brake linings of carbon-containing material. Such brake linings have the advantages of the known brake linings without their disadvantages. For example, surface changes do not occur in brake linings of sintered bronze, even after a rather long run time, so that it is assured that the rotor brakes of the open-end spinning machine have a uniformly high braking action over their entire service life at a reasonable cost.
- The brake linings can preferably be fixed via a screw bolt and a fastening nut in a readily replaceable manner to the associated brake levers so that when needed a worn brake lining can be removed simply by loosening the screw bolt without problems and replacing it with a new brake lining.
- Another preferred embodiment of the present invention is that the brake lining has a downward-opening fastening slot into which a centering extension of the fastening nut fits in the assembled state. That is, the brake lining can be simply drawn up by the brake lever for replacement after the screw bolt has been loosened, during which the screw bolt and the fastening nut remain in their assembled state. The assembly of the new brake lining proceeds just as simply. In this instance, the brake lining is lowered with its fastening slot from above, over the screw bolt, and the centering extension of the fastening nut and the screw bolt is subsequently retightened.
- Further details of the invention can be gathered from a non-limiting exemplary embodiment presented in the following description with reference made to the drawings.
- FIG. 1 is a schematic view of an open-end rotor spinning device with a tong-like rotor brake as well as with brake linings detachably arranged on the brake levers and manufactured from sintered bronze.
- FIG. 2 is an enlarged view of a brake lever with a brake lining in accordance with the present invention.
- FIG. 3 is a front view of a brake lining with fastening nut in accordance with the present invention.
- FIG. 4 is a side view of the brake lining according to FIG. 3.
- The open-end
rotor spinning device 1 shown in FIG. 1 is equipped with a known spinning means, a so-called spinning rotor (not shown in detail), which is rotatably supported by itsrotor shaft 2 inbearing nip 3 of support disk bearing 4. - Such a support disk bearing, that has long been known in conjunction with an open-end rotor spinning device, typically comprises two support disk pairs with front and
rear support disks 7 connected viashaft 5 in such a manner as to rotate in unison, which shaft is rotatably supported inroller bearings 6 such as ball bearings. - As is indicated in FIG. 1, rotor brake8 is in the form of a tong having arms which can be positioned on
rotor shaft 2. The tong arms of rotor brake 8 are designed as brake levers 9, 10 that are supported inpivot shafts spring element 25 into an open non-braking position. - As shown in FIG. 2, brake levers9, 10 each have a
bearing 13 on the end.Brake lining 16 manufactured from sintered bronze is fastened in a replaceable manner to thesebearings 13 viascrew bolt 14 and fasteningnut 26. - Brake levers9, 10 each have sliding
surface 18 on their endopposite brake lining 16. Sliding surfaces converge toward one another in the assembled state. Preferably roller-like pressure element 19contacts sliding surfaces 18, whichelement 19 is mounted so that it can shift in direction B and at the same time move brake levers 9, 10 counter to the force ofspring element 25 in a braking direction toward contact with therotor shaft 2. -
Pressure element 19 is preferably fixed between the side walls of U-shaped actuatinglever 20 which is mounted in a manner such that it can rotate in a limited manner aboutpivot axis 21. - In addition,
leaf spring 22 is fastened to actuatinglever 20 and comprisescatch ring 23 on its end. An actuating linkage (not shown) contacts thiscatch ring 23, which linkage is loaded in case of service by a movable service unit, a so-called spinning-start carriage, that automatically supplies the open-end rotor spinning devices. - As is evident from FIG. 3, in particular,
brake lining 16 is essentially rectangular when viewed from the front and the comers are rounded off. Moreover, downwardly-openingfastening slot 15 is located on the bottom ofbrake lining 16, as shown in FIG. 4. Fasteningnut 26 engages with itscentering extension 17 into thisfastening slot 15 in the assembled state. That is,brake lining 16 can be fixed in a non-positive manner on brake levers 9, 10 byscrew bolts 14 and associatedfastening nut 26 and can therefore be readily removed from theparticular bearing 13 if required and replaced by anew brake lining 16. - It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements, will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention. Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiments, adaptations, variations, modifications and equivalent arrangements, the present invention being limited only by the claims appended hereto and the equivalents thereof.
Claims (3)
1. A brake for an open-end spinning rotor rotatably supported for high speed rotation in a rotor housing by a rotor shaft disposed in a bearing nip of a support-disk bearing, the brake comprising at least one brake lever having a brake lining comprised of sintered bronze, the brake lever being disposed for selective braking movement into and out of engagement with the rotor shaft.
2. The brake according to claim 1 , wherein the brake lining is fixed to the brake lever via a detachable fastener assembly for selective replacement.
3. The brake according to claim 2 , wherein the brake lining comprises a fastening slot open at the bottom into which extends a centering extension of the fastener assembly in an assembled state.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10100524.5 | 2001-01-08 | ||
DE10100524A DE10100524A1 (en) | 2001-01-08 | 2001-01-08 | Brake for an open-end spinning rotor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020088674A1 true US20020088674A1 (en) | 2002-07-11 |
Family
ID=7669956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/041,421 Abandoned US20020088674A1 (en) | 2001-01-08 | 2002-01-08 | Brake for an open-end spinning rotor |
Country Status (5)
Country | Link |
---|---|
US (1) | US20020088674A1 (en) |
EP (1) | EP1221501B1 (en) |
CZ (1) | CZ200244A3 (en) |
DE (2) | DE10100524A1 (en) |
TR (1) | TR200400860T4 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10760359B2 (en) | 2018-07-11 | 2020-09-01 | Weatherford Technology Holdings, Llc | Wellbore tong |
US11377915B2 (en) | 2019-02-13 | 2022-07-05 | Weatherford Technology Holdings, Llc | Wellbore tong |
US11572746B2 (en) | 2019-10-18 | 2023-02-07 | Weatherford Technology Holdings Llc | Rotary gripping apparatus for a power tong |
US11629561B2 (en) | 2020-02-03 | 2023-04-18 | Weatherford Technology Holdings, LLC. | Brakes for a tong |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4443666A1 (en) * | 1994-12-08 | 1996-06-20 | Sinterstahl Gmbh | Synchronizer ring with sintered bronze friction surface |
DE19618261A1 (en) * | 1996-05-07 | 1997-11-13 | Stahlecker Fritz | Brake for open-end spinning machine has brake lining |
DE19735973A1 (en) * | 1997-08-19 | 1999-02-25 | Schlafhorst & Co W | Spinning rotor brake |
DE19802655A1 (en) * | 1998-01-24 | 1999-07-29 | Schlafhorst & Co W | Brake mechanism for an open end spinning rotor shaft |
-
2001
- 2001-01-08 DE DE10100524A patent/DE10100524A1/en not_active Withdrawn
- 2001-11-07 DE DE50101900T patent/DE50101900D1/en not_active Expired - Fee Related
- 2001-11-07 EP EP01126340A patent/EP1221501B1/en not_active Expired - Lifetime
- 2001-11-07 TR TR2004/00860T patent/TR200400860T4/en unknown
-
2002
- 2002-01-04 CZ CZ200244A patent/CZ200244A3/en unknown
- 2002-01-08 US US10/041,421 patent/US20020088674A1/en not_active Abandoned
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10760359B2 (en) | 2018-07-11 | 2020-09-01 | Weatherford Technology Holdings, Llc | Wellbore tong |
US11377915B2 (en) | 2019-02-13 | 2022-07-05 | Weatherford Technology Holdings, Llc | Wellbore tong |
US11572746B2 (en) | 2019-10-18 | 2023-02-07 | Weatherford Technology Holdings Llc | Rotary gripping apparatus for a power tong |
US11629561B2 (en) | 2020-02-03 | 2023-04-18 | Weatherford Technology Holdings, LLC. | Brakes for a tong |
US11939824B2 (en) | 2020-02-03 | 2024-03-26 | Weatherford Technology Holdings, Llc | Brakes for a tong |
Also Published As
Publication number | Publication date |
---|---|
TR200400860T4 (en) | 2004-06-21 |
DE10100524A1 (en) | 2002-07-11 |
EP1221501B1 (en) | 2004-04-07 |
EP1221501A1 (en) | 2002-07-10 |
CZ200244A3 (en) | 2002-08-14 |
DE50101900D1 (en) | 2004-05-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: W. SCHLAFHORST AG & CO., GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WASSENHOVEN, HEINZ-GEORG;REEL/FRAME:012477/0455 Effective date: 20011207 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |