CA1038615A - Machine for acting on continuously running textile yarn - Google Patents
Machine for acting on continuously running textile yarnInfo
- Publication number
- CA1038615A CA1038615A CA249,858A CA249858A CA1038615A CA 1038615 A CA1038615 A CA 1038615A CA 249858 A CA249858 A CA 249858A CA 1038615 A CA1038615 A CA 1038615A
- Authority
- CA
- Canada
- Prior art keywords
- machine
- tube
- yarn
- doffer
- area
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/16—Devices for entraining material by flow of liquids or gases, e.g. air-blast devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
Landscapes
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A machine for acting on continuously running textile yarn, such as a texturising machine, has a doffor system including a plurality of doffer tubes each having apertures, at spaced intervals therealong, each normally closed in use by a sleeve. Each tube has an internal diameter of from 20-10mm, and the area of each aperture is at least 30% of the internal cross-sectional area of the tube. The result is a system which gives mere yarn tension and faster threading-up times with reduced material costs, reduced-size exhausted and lower power requirements.
A machine for acting on continuously running textile yarn, such as a texturising machine, has a doffor system including a plurality of doffer tubes each having apertures, at spaced intervals therealong, each normally closed in use by a sleeve. Each tube has an internal diameter of from 20-10mm, and the area of each aperture is at least 30% of the internal cross-sectional area of the tube. The result is a system which gives mere yarn tension and faster threading-up times with reduced material costs, reduced-size exhausted and lower power requirements.
Description
~03~6~5 1 This invention relates to a machine for acting on - continuously running textile yarns. In British Patent No.
137 124~ there is described a crimping machine which has an improved doffing system. The present invention is applicable to a false twisting machine, and also to other machines acting on continuous running flexible yarns, for example machines for re-winding yarn from one package to another.
The doffing system in the aforesaid British Patent has doffer tubes one inch (25mm) in diameter and tubes used pre-viously have usually been from about 25 mm up to 50 mm indiameter. Such relatively large tubes have always been thought necessary in order to prevent drag, i.e. frictional losses, and to ensure sufficient air flow to generate adequate tension in a yarn being doffed. It has never been thought possible to use smaller tubes, although this would be desirable as they are cheaper and take up less space on the machine.
Surprisingly, we have found that it is possible to use tubes smaller than 25 mm diameter, provided the size of the -~
apertures therein is carefully controlled, and provided a lower diameter limit is not passed. This lower limit is set by the increasing costs of handling and machining small stock.
Still further surprising is that the smaller tubes give greater yarn tension then previous systems-and the system using the smaller tubes requires substantially less power than ~ '!"' '' known systems. This means that running costs are less.
The present invention provides a machine for acting on continuously-running yarn wherein a doffer system is provided having an exhauster including a prime mover, fan and filter, a plurality of tubes, each extending along the machine and each having a plurality of spaced-apart apertures each 3~ '
137 124~ there is described a crimping machine which has an improved doffing system. The present invention is applicable to a false twisting machine, and also to other machines acting on continuous running flexible yarns, for example machines for re-winding yarn from one package to another.
The doffing system in the aforesaid British Patent has doffer tubes one inch (25mm) in diameter and tubes used pre-viously have usually been from about 25 mm up to 50 mm indiameter. Such relatively large tubes have always been thought necessary in order to prevent drag, i.e. frictional losses, and to ensure sufficient air flow to generate adequate tension in a yarn being doffed. It has never been thought possible to use smaller tubes, although this would be desirable as they are cheaper and take up less space on the machine.
Surprisingly, we have found that it is possible to use tubes smaller than 25 mm diameter, provided the size of the -~
apertures therein is carefully controlled, and provided a lower diameter limit is not passed. This lower limit is set by the increasing costs of handling and machining small stock.
Still further surprising is that the smaller tubes give greater yarn tension then previous systems-and the system using the smaller tubes requires substantially less power than ~ '!"' '' known systems. This means that running costs are less.
The present invention provides a machine for acting on continuously-running yarn wherein a doffer system is provided having an exhauster including a prime mover, fan and filter, a plurality of tubes, each extending along the machine and each having a plurality of spaced-apart apertures each 3~ '
-2 : ~
~038615 ~ , 1 normally closed by a sleeve of resilient material slidable along the tube, wherein each tube has an internal diameter between 10 and 20 mm and the area ratio (that is the area of each aperture to the internal cross-sectional area of the tube) is greater than 30%. Preferably the area of each aperture lies between 30% and 100% of the cross-sectional area of the tube.
Preferably each aperture has an area between 50% and 70% of the internal area of the tube, which advantageously has an internal diameter from 15 to 17 mm.
The invention will be described further, by way of example, with reference to the accompanying drawings, wherein:
Fig. 1 is a general arrangement of a known doffer system of a texturising machine; ~ ~-Fig. 2 is a detail of the portion ringed in Fig.l;
Fig. 3 is a general arrangement of a doffer system of a preferred embodiment of machine of the invention, again ; -a textilising machine;
Fig. 4 is an enlarged fragmentation detail, part sectional, of the left-hand ringed portion of Fig. 3;
Flg. S is a similar detail of the right-hand ringed portion of Fig. 3; and Fig. 6 is a view similar to that of Fig. 4, but ~ -showing a variant.
Referring firstly to Figs. l and 2, it will be seen -that a known doffer system on a texturising machine (indicated in dotted lines) has an exhauster lO and a pair of doffer tubes ll extending the full length of the machine. Each tube is about 25 mm in outside diameter (22 mm inside diameter) and ':
_3_ ' . :'.'. .
~0386~s 1 has a plurality of apertures 12 spaced therealong, each about 12 mm in diameter. Each aperture is normally sealed by a res-pective sleeve 13 whose body is of resilient material so that it can sealingly engage the edges of the aperture 12 to prevent leakage of air into the tube 11. The area of each aperture is about 33% of the cross sectional area of the tube. The exhauster 10 comprises a yarn receiving compartment 14, a yarn arrester 15, a fan 17 and an electric motor 16. The exhauster 10 is a rectangular casing about 900 mm x 850 mm x 450 mm and the tO motor 16 is rated at 5.5 horsepower (4103 watts).
Turning now to Figs.3 to 6 of the drawings, a doffer system 20 of a preferred embodiment of machine of the invention (a texturising machine similar to that described in British - Patent Specification No. 1371244) whose central structure is indicated in dotted lines, has an exhauster 21. Exhauster 21 is similar in constuction to exhauster 10, having a yarn-receiving compartmènt, yarn arrester, fan and electric motor (all not shown). The exhauster 21 is contained within a casing which is about 600 mm x 750 mm x 350 mm, i.e. has less than 2Q half the volume of exhauster 10. The motor of exhauster 21 has a rating of 3 horsepower (2238 watts), that is less than 55~ of the rating of the motor of exhauster 10. The fan typically has characteristics of 2300 mm WG at zero volume and about 260 cu.m per minute at zero suction.
Doffer tubes 22 extend along the length of the machine and each has spaced apart apertures 23 normally closed by sleeves 23 similar to sleeves 13. The apertures 23 combe slots 24 (as in Fig. 4) or circular holes 25 (as in Fig. 6).
This point will be discussed later. Each doffer tube 22 is connected via a special L-shaped elbow 26 to a flexible tube 1 27, of larger diameter than the doffer tube 22, which connects with the exhauster 21. Tube 27 is greater in diameter than the doffer tube 22 in order to reduce the possible friction :
between yarn and the flexible tube 27. Elbow 26 (Fig. 5) has a first limb 28,of diameter equal to the diameter of doffer tube 22 connecting with a second limb 29, at right angles to the first limb 28, of the same diameter of the first limb 28 to the diameter of tube 27. The upper end of the second limb 29 is closed except for a central aperture 30, which allows increased air flow through tube 27 to compensate for the increased diameter thereof so to maintain the air velocity the same in tube 27. Where the limb 28 meets limb 29, a short extension 31 is provided which forms a yarn guide - to maintain yarn 32 central in the two limbs and reduce friction as it changes direction. .
The size of doffer tubes 22 which have been used are (A) nominal 3/4 inch and (B) nominal 5/8 inch tubes which have internal diameters of approximately 17 and 15 mm respectively.
Circular apertures about 9.5 mm in diameter have been used -(a) as well as slots 9.5 x 15.8 mm (b) and 9.5 x 22.2 mm lc).
Apertures (a) have been used in relation to tube B, when the area ratio (area of aperture/area of tube) % was abaut 37%.
Apertures (b) and (c) have been used with tube A, when the - area ratio was 66~ and 97%. All combinations of the given :
apertures and tube sizes can be used, however, but combination (c) B gives an area ratio of 150%, which is not preferred, because no significant increase in yarn tension is obtained with an area ratio greater than 100~. :
Slots are preferred in most instances, because for the same area they extend over more of the length of the tube and ;
. ' ':
." ..
-5~
,~
- , :, 103B~;~.5 1 it is therefore easier for an operative to 'hit' the aperture when he 'throws' a yarn to be doffed.
The yarn tension obtained with the doffer system on the machine of the invention is considerably greater than that obtained with the known doffer system, a typical increase, under comparable conditions, being about ~0%. The new doffer system also has considerable advantages in threading up the machine. During threading up, the operative leads a yarn from the heater of the machine, through the non-rotating spinner, and to the doffer tube. This yarn must be moved past the -heater at its running speed to avoid melting of the yarn by the heater and fouling of the latter. Because the spinner is not operating the yarn being doffed is 'flat', i.e. is not texturised, and thus is not so easily "gripped" by the air-stream. Thus the increased tension applied by the new doffer system greatly speeds up the threading of the machine and so considerably reduces machine downtime.
The invention is not limited to the foregoing and variations can be made thereto. For example the machine does not have to be a texturising machine and can be any ~achine acting on continuously-running yarn, such as a machine for re-winding yarn from one package to another.
-
~038615 ~ , 1 normally closed by a sleeve of resilient material slidable along the tube, wherein each tube has an internal diameter between 10 and 20 mm and the area ratio (that is the area of each aperture to the internal cross-sectional area of the tube) is greater than 30%. Preferably the area of each aperture lies between 30% and 100% of the cross-sectional area of the tube.
Preferably each aperture has an area between 50% and 70% of the internal area of the tube, which advantageously has an internal diameter from 15 to 17 mm.
The invention will be described further, by way of example, with reference to the accompanying drawings, wherein:
Fig. 1 is a general arrangement of a known doffer system of a texturising machine; ~ ~-Fig. 2 is a detail of the portion ringed in Fig.l;
Fig. 3 is a general arrangement of a doffer system of a preferred embodiment of machine of the invention, again ; -a textilising machine;
Fig. 4 is an enlarged fragmentation detail, part sectional, of the left-hand ringed portion of Fig. 3;
Flg. S is a similar detail of the right-hand ringed portion of Fig. 3; and Fig. 6 is a view similar to that of Fig. 4, but ~ -showing a variant.
Referring firstly to Figs. l and 2, it will be seen -that a known doffer system on a texturising machine (indicated in dotted lines) has an exhauster lO and a pair of doffer tubes ll extending the full length of the machine. Each tube is about 25 mm in outside diameter (22 mm inside diameter) and ':
_3_ ' . :'.'. .
~0386~s 1 has a plurality of apertures 12 spaced therealong, each about 12 mm in diameter. Each aperture is normally sealed by a res-pective sleeve 13 whose body is of resilient material so that it can sealingly engage the edges of the aperture 12 to prevent leakage of air into the tube 11. The area of each aperture is about 33% of the cross sectional area of the tube. The exhauster 10 comprises a yarn receiving compartment 14, a yarn arrester 15, a fan 17 and an electric motor 16. The exhauster 10 is a rectangular casing about 900 mm x 850 mm x 450 mm and the tO motor 16 is rated at 5.5 horsepower (4103 watts).
Turning now to Figs.3 to 6 of the drawings, a doffer system 20 of a preferred embodiment of machine of the invention (a texturising machine similar to that described in British - Patent Specification No. 1371244) whose central structure is indicated in dotted lines, has an exhauster 21. Exhauster 21 is similar in constuction to exhauster 10, having a yarn-receiving compartmènt, yarn arrester, fan and electric motor (all not shown). The exhauster 21 is contained within a casing which is about 600 mm x 750 mm x 350 mm, i.e. has less than 2Q half the volume of exhauster 10. The motor of exhauster 21 has a rating of 3 horsepower (2238 watts), that is less than 55~ of the rating of the motor of exhauster 10. The fan typically has characteristics of 2300 mm WG at zero volume and about 260 cu.m per minute at zero suction.
Doffer tubes 22 extend along the length of the machine and each has spaced apart apertures 23 normally closed by sleeves 23 similar to sleeves 13. The apertures 23 combe slots 24 (as in Fig. 4) or circular holes 25 (as in Fig. 6).
This point will be discussed later. Each doffer tube 22 is connected via a special L-shaped elbow 26 to a flexible tube 1 27, of larger diameter than the doffer tube 22, which connects with the exhauster 21. Tube 27 is greater in diameter than the doffer tube 22 in order to reduce the possible friction :
between yarn and the flexible tube 27. Elbow 26 (Fig. 5) has a first limb 28,of diameter equal to the diameter of doffer tube 22 connecting with a second limb 29, at right angles to the first limb 28, of the same diameter of the first limb 28 to the diameter of tube 27. The upper end of the second limb 29 is closed except for a central aperture 30, which allows increased air flow through tube 27 to compensate for the increased diameter thereof so to maintain the air velocity the same in tube 27. Where the limb 28 meets limb 29, a short extension 31 is provided which forms a yarn guide - to maintain yarn 32 central in the two limbs and reduce friction as it changes direction. .
The size of doffer tubes 22 which have been used are (A) nominal 3/4 inch and (B) nominal 5/8 inch tubes which have internal diameters of approximately 17 and 15 mm respectively.
Circular apertures about 9.5 mm in diameter have been used -(a) as well as slots 9.5 x 15.8 mm (b) and 9.5 x 22.2 mm lc).
Apertures (a) have been used in relation to tube B, when the area ratio (area of aperture/area of tube) % was abaut 37%.
Apertures (b) and (c) have been used with tube A, when the - area ratio was 66~ and 97%. All combinations of the given :
apertures and tube sizes can be used, however, but combination (c) B gives an area ratio of 150%, which is not preferred, because no significant increase in yarn tension is obtained with an area ratio greater than 100~. :
Slots are preferred in most instances, because for the same area they extend over more of the length of the tube and ;
. ' ':
." ..
-5~
,~
- , :, 103B~;~.5 1 it is therefore easier for an operative to 'hit' the aperture when he 'throws' a yarn to be doffed.
The yarn tension obtained with the doffer system on the machine of the invention is considerably greater than that obtained with the known doffer system, a typical increase, under comparable conditions, being about ~0%. The new doffer system also has considerable advantages in threading up the machine. During threading up, the operative leads a yarn from the heater of the machine, through the non-rotating spinner, and to the doffer tube. This yarn must be moved past the -heater at its running speed to avoid melting of the yarn by the heater and fouling of the latter. Because the spinner is not operating the yarn being doffed is 'flat', i.e. is not texturised, and thus is not so easily "gripped" by the air-stream. Thus the increased tension applied by the new doffer system greatly speeds up the threading of the machine and so considerably reduces machine downtime.
The invention is not limited to the foregoing and variations can be made thereto. For example the machine does not have to be a texturising machine and can be any ~achine acting on continuously-running yarn, such as a machine for re-winding yarn from one package to another.
-
Claims (7)
1. A machine for acting on continuously-running yarn where-in a doffer system is provided having an exhauster including a prime mover, fan and yarn arrester, a plurality of tubes, each extending along the machine and each having a plurality of spaced-apart apertures each normally closed by a sleeve of re-silient material slidable along the tube, wherein each tube has an internal diameter between 10 and 20 mm and the area ratio (that is the area of each aperture compared to the internal cross-sectional area of the tube) is greater than 30%.
2. A machine as claimed in claim 1, wherein the area ratio lies between 30% and 100%.
3. A machine as claimed in claim 1 wherein each tube has an internal diameter from 15 to 17 mm.
4. A machine as claimed in claim 1, 2 or 3, wherein the area ratio is from 50% to 70%.
5. A machine as claimed in claim 1, 2 or 3, wherein the apertures are in the form of slots, whose longer axis lies parallel to the tube axis.
6. A machine as claimed in claim 1, wherein each doffer tube is connected to the exhauster via an elbow joint and a flexible tube of larger diameter than the doffer tube.
7. A machine as claimed in claim 6, wherein the elbow has a lip at its junction for reducing yarn friction.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1538575A GB1492475A (en) | 1975-04-15 | 1975-04-15 | Machine for acting on continuously running yarn |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1038615A true CA1038615A (en) | 1978-09-19 |
Family
ID=10058230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA249,858A Expired CA1038615A (en) | 1975-04-15 | 1976-04-08 | Machine for acting on continuously running textile yarn |
Country Status (6)
| Country | Link |
|---|---|
| CA (1) | CA1038615A (en) |
| CH (1) | CH597070A5 (en) |
| DE (1) | DE2616244A1 (en) |
| FR (1) | FR2307744A1 (en) |
| GB (1) | GB1492475A (en) |
| IT (1) | IT1205949B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2153599A5 (en) * | 1971-09-15 | 1973-05-04 | Rhodiaceta | |
| GB1371244A (en) * | 1971-12-09 | 1974-10-23 | Howorth Air Conditioning Ltd | Machines acting on continuously running textile yarns |
| JPS5029536B2 (en) * | 1972-02-05 | 1975-09-23 | ||
| GB1381195A (en) * | 1972-09-12 | 1975-01-22 | Howorth Air Conditioning Ltd | Machines for processing continuously running yarns |
-
1975
- 1975-04-15 GB GB1538575A patent/GB1492475A/en not_active Expired
-
1976
- 1976-04-08 CH CH442476A patent/CH597070A5/xx not_active IP Right Cessation
- 1976-04-08 CA CA249,858A patent/CA1038615A/en not_active Expired
- 1976-04-13 DE DE19762616244 patent/DE2616244A1/en active Pending
- 1976-04-14 IT IT8361576A patent/IT1205949B/en active
- 1976-04-15 FR FR7611190A patent/FR2307744A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE2616244A1 (en) | 1977-04-07 |
| GB1492475A (en) | 1977-11-23 |
| FR2307744A1 (en) | 1976-11-12 |
| CH597070A5 (en) | 1978-03-31 |
| FR2307744B1 (en) | 1978-05-05 |
| IT1205949B (en) | 1989-04-05 |
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