GB1577845A - Pneumatically removing fibrous ribbon together with any severed yarn end from a spinning rotor of an open end spinning machine - Google Patents

Pneumatically removing fibrous ribbon together with any severed yarn end from a spinning rotor of an open end spinning machine Download PDF

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Publication number
GB1577845A
GB1577845A GB3445677A GB3445677A GB1577845A GB 1577845 A GB1577845 A GB 1577845A GB 3445677 A GB3445677 A GB 3445677A GB 3445677 A GB3445677 A GB 3445677A GB 1577845 A GB1577845 A GB 1577845A
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GB
United Kingdom
Prior art keywords
spinning
spinning rotor
rotor
ribbon
yarn end
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
Application number
GB3445677A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vyzkumny Ustav Bavlnarsky AS
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Vyzkumny Ustav Bavlnarsky AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vyzkumny Ustav Bavlnarsky AS filed Critical Vyzkumny Ustav Bavlnarsky AS
Publication of GB1577845A publication Critical patent/GB1577845A/en
Expired legal-status Critical Current

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Classifications

    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H4/00Open-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
    • D01H4/04Open-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
    • D01H4/08Rotor spinning, i.e. the running surface being provided by a rotor
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H4/00Open-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
    • D01H4/04Open-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
    • D01H4/22Cleaning of running surfaces
    • D01H4/24Cleaning of running surfaces in rotor spinning
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H4/00Open-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
    • D01H4/40Removing running yarn from the yarn forming region, e.g. using tubes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

The flat (6) provided with the fibre-feed channel (63) has a peripherally placed blowing nozzle (7), the outlet of which is located in the end plane of the spinning rotor when the spinning rotor (1) is in the position uncoupled from the flat (6). A compressed-air stream sweeping over the end plane forms a suction effect, by means of which the fibre sliver, together with the yarn end, is removed from the spinning rotor (1). A further auxiliary blowing nozzle (71) works in the coupled position. The blowing nozzles can be loaded with a continuous or discontinuous compressed-air stream. The invention is preferably suitable for use on automated open-end spinning machines. <IMAGE>

Description

(54) PNEUMATICALLY REMOVING FIBROUS RIBBON, TOGETHER WITH ANY SEVERED YARN END, FROM A SPINNING ROTOR OF AN OPEN END SPINNING MACHINE (71) We, VYZKUMNY USTAV BAVL NARSKY, of Usti nad Orlici, Czechoslovakia, a Corporate Body organised and existing under the laws of Czechoslovakia, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to pneumatically removing a fibrous ribbon together with any severed yarn end, from a spinning rotor of an open-end spinning machine when there occurs an interruption of the spinning process.
Apart from many positive factors of openend spinning machine operation resulting, for example, in an improved yarn quality, or in reduction of excessive labour, there exist here certain problems encountered in case of an interruption of the spinning process, owing to a thread breakage, or to machine stoppages.
In the event of such an interruption it is necessary to remove from the spinning rotor a fibrous ribbon, together with any yarn end sucked into the rotor after having been severed. Some heretofore used methods which have been suggested to assume this function by employing either periodic or continuous spinning rotor cleaning means therefor, fail to perform this operation reliably. It is why the aforementioned methods are not suitable to be used with modern highly effective and automated open-end spinning machines.
It is an object of the present invention to eliminate the disadvantages of prior art as hereinabove set forth and consequently to provide highly effective and automated open-end spinning machines having reliable spinning-in means.
According to one aspect of the invention there is provided a method of pneumatically removing a fibrous ribbon together with any severed yarn end, from the spinning rotor of an open-end spinning machine when there occurs an interruption of the spinning process, the method comprising the steps of withdrawing the fibrous ribbon together with any severed yarn end by a pressure air stream flowing in the plane of the edge of the open mouth of the spinning rotor and scavenging the spinning rotor by a second pressure air stream directed towards the collecting surface of the spinning rotor in order to remove any fibre remains.
According to another aspect of the invention there is provided an open-end spinning machine comprising a spinning rotor having an open mouth which, in the normal operating position of the spinning rotor, is masked by a cover, the spinning rotor being movable from its normal operating position to a position of relative disengagement in which a nozzle in the cover can direct a pressure air stream in the plane of the edge of the open mouth of the spinning rotor, and wherein the cover also has therein an auxiliary nozzle directed, in the normal operating position of the spinning rotor, towards the collecting surface of the spinning rotor.
Preferably, in axial view of the spinning rotor in its normal operating position, a geometric projection of the auxiliary nozzle axis onto a plane perpendicular to the spinning rotor axis and crossing the collecting surface, includes an angle of from 600 to 750 with a tangent drawn through the intersection of said auxiliary nozzle axis with the collecting surface.
Advantageously, the pressure air stream when flowing from both the ribbon removing nozzle and the auxiliary nozzle, can be blown intermittently in short intervals immediately following one after the other so as to improve the ribbon removing process efficiency.
A preferred embodiment of the apparatus, according to the invention will hereinafter be described, by way of example, with refer- ence to the accompanying drawings, in which: Fig. 1 shows a mutual arrangement of a bobbin, a traverse roller, a cutting mechanism, a spinning rotor and a cover with the respective ducts and nozzles; Fig. 2 shows a spinning rotor and the cover in the relative disengagement position as seen in axial view of the ribbon removing nozzle; Fig. 3 is a similar view as shown in Fig.
2 but seen in a direction perpendicular to the axis of the ribbon removing nozzle; Fig. 4 is a top view showing the mouth of the auxiliary nozzle in the cover; and Fig. 5 shows a sectional view of the cutting mechanism in the position following the thread cutting step.
A spinning rotor I supported on bearings 11 and 12 is in driving contact with not shown driving means, and its cavity, having a fibre collecting surface 13, communicates with a yarn take-off duct 14 for withdrawing yarn 2, the presence of which is scanned by a feeler 31 forming a part of a control unit 3. Yarn 2 passes through a cutting mechanism 4 and is wound by means of a traverse roller 5 onto a bobbin 21 in friction contact with said roller 5.
In operation, the open mouth of the spinning rotor I is masked in a contactless manner by a cover 6 in which an annular recess 61, coaxial with the spinning rotor 1, is provided. The edge of the open mouth of the spinning rotor I is received in said recess 61 while the cover 6 is provided with a projection 62 which in this case is of cylindrical shape coaxial with the recess 61 and which partially protrudes into the rotor cavity. In the body of the cover 6 which can form a part of the housing of a known fibre separating device (not shown) there is provided a fibre supply duct 63 oriented towards a slide wall 15 of the spinning rotor 1; in the shown embodiment the fibre supply duct 63 opens in a peripheral groove provided in the cylindrical projection 62. However, it is also possible to apply other constructions comprising various baffle means, or the like.
Further in the cover 6, a ribbon removing nozzle 7 and an auxiliary nozzle 71 are provided. While the former opens in the outer wall of the annular recess 61, the latter opens in the wall of said peripheral groove in the projection 62 and extendsin the spinning position--obliquely upwards toward the collecting surface 13 so that-in axial view as shown in Fig. the axis of the auxiliary nozzle 71 forms an angle A preferably of from 600 to 700 with a tangent drawn through the intersection of said axis with the circumferential circle of the collecting surface 13.The relative disengagement of the spinning rotor I and the cover 6 so as to assume the inoperative position as shown in Figs. 2 and 3, is achieved by using not shown mechanical or mechano-pneumatic means actuated by a signal given by the control unit 3 which further controls the drive of the traverse roller 5, the spinning rotor 1, the cutting mechanism 4, the fibre supply through the duct 63, the ribbon removing nozzle 7 and the auxiliary nozzle 71. The function of the control unit is monitored by a programme.
In operation, separated fibres are conveyed to the slide wall 15 of the rotating high-speed spinning rotor I and, due to centrifugal force, deposited onto the collecting surface 13 to be converted into a fibrous ribbon which is then taken off and twisted to yarn. The yarn is withdrawn in a wellknown not shown manner from the spinning rotor 1, is scanned by the feeler 31, passes through the cutting mechanism 4 and finally is wound onto the bobbin 21. Hereinafter one of the possible ribbon removing process alterntive is described.
In case of a thread breakage, the feeler 31 delivers a signal causing the bobbin 21 to stop before the end of broken yarn 2 has passed through the cutting mechanism 4.
Simultaneously the supply of fibres to the spinning rotor I is stopped. The cutting mechanism 4 cuts off the end of the yarn 2 (see the position in Fig. 5) whereupon, due to a short-termed reverse rotation of the bobbin 21, the yarn extending from said bobbin 21 enters the lower part of a tube 41 in which a subatmospheric pressure is produced. The spinning rotor I is at a standstill so that a relative disengagement of the latter and the cover 6 from each other, into the position shown in Figs. 2 and 3, may be effected. In this position the nozzle 7 is actuated in that a pressure air stream is either continuously or intermittently blown thereout substantially in the plane of the edge of the open mouth of the spinning rotor 1, whereby a suction effect is produced, causing the fibrous ribbon, together with the severed sucked yarn end, to leave the spinning rotor 1.
After the re-engagement of the spinning rotor I and the cover 6 the open mouth of the former is closed again by the projection 62, and any remaining fibrous ribbon in the spinning rotor I is removed therefrom by an intermittent pressure air stream blown out of the auxiliary nozzle 71, and leaves the rotor I through a gap between the latter and the cover 6.
The fibrous ribbon is removed and the yarn end is conveyed to a not shown casing outside the spinning rotor and finally into a central duct for withdrawing air out of the machine. During the operation of the auxiliary nozzle 71, the spinning rotor I can be slowly rotated by the air discharged from the nozzle.
After the afore-described operating steps, the spinning rotor 1 is restarted, the cutting mechanism 4 is replaced in the original operative position while cutting off the yarn end received in the lower part of the tube 14, and the bobbin 21 is tumed in reverse direction whereby the end of the yarn 2 is introduced into the spinning rotor 1. Said yarn end is then sucked into the rotor I due to the subatmospheric pressure produced therein while the rotor I is being simultaneously fed with separated fibres forming a ribbon to join the introduced yarn end. Then the bobbin 21 begins to rotate in the normal or winding direction and simultaneously the take-off of the yarn 2 from the spinning rotor I is re-started and the feeler 31 actuated. Thus the spinning operation is re-established.
Another of the ribbon removing process alternatives consists, according to the invention, in that the yarn end during said process is fixed by introducing, e.g. by means of a pneumatic effect, into a reserve tube (the so-called "third hand principle"). There it is held either by means of an air stream flowing out of another auxiliary nozzle or due to a suction effect prevailing in the reserve tube during the whole ribbon removing process. Before re-establishing the spinning process, i.e. before the spinning rotor has attained its full speed, the yarn end is introduced, either by another air stream flowing out of said other auxiliary nozzle or a suction effect or by a combination of both, into the spinning rotor for being spunin again.During the time interval for which the yarn end is held in the reserve position, it can be appropriately treated by using means not comprehended within the scope of the invention.
WHAT WE CLAIM IS:- 1. A method of pneumatically removing a fibrous ribbon, together with any severed yarn end, from the spinning rotor of an open end spinning machine when there occurs an interruption of the spinning process, the method comprising the steps of withdrawing the fibrous ribbon, together with any severed yarn end, by a pressure air stream flowing in the plane of the edge of the open mouth of the spinning rotor and scavenging the spinning rotor by a second pressure air stream directed towards the collecting surface of the spinning rotor in order to remove any fibre remains.
2. An open-end spinning machine comprising a spinning rotor having an open mouth which, in the normal operating position of the spinning rotor, is masked by a cover, the spinning rotor being movable from its normal operating position to a position of relative disengagement in which a nozzle in the cover can direct a pressure air stream in the plane of the edge of the open mouth of the spinning rotor and wherein the cover also has therein an auxiliary nozzle directed, in the normal operating position of the spinning rotor, towards the collecting surface of the spinning rotor.
3. A spinning machine as claimed in claim 2, wherein in axial view of the spinning rotor in its normal operating position, a geometric projection of the auxiliary nozzle axis onto a plane perpendicular to the spinning rotor axis and crossing the collecting surface, includes an angle of from 600 to 750 with a tangent drawn through the intersection of said auxiliary nozzle axis with the collecting surface.
4. A spinning machine as claimed in claim 2 or 3, wherein the pressure air stream when flowing from both the ribbon removing nozzle and the auxiliary nozzle, can be blown intermittently in short intervals immediately following one after the other so as to improve the ribbon removing process efficiency.
5. A method of pneumatically removing a fibrous ribbon, together with any severed yarn end, from the spinning rotor of an open-end spinning machine when there occurs an interruption of the spinning process, substantially as hereinbefore described with reference to the accompanying drawings.
6. An open-end spinning machine, substantially as hereinbefore described with reference to the accompanying drawings.
T TM rT Tb A s TE T S
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. be slowly rotated by the air discharged from the nozzle. After the afore-described operating steps, the spinning rotor 1 is restarted, the cutting mechanism 4 is replaced in the original operative position while cutting off the yarn end received in the lower part of the tube 14, and the bobbin 21 is tumed in reverse direction whereby the end of the yarn 2 is introduced into the spinning rotor 1. Said yarn end is then sucked into the rotor I due to the subatmospheric pressure produced therein while the rotor I is being simultaneously fed with separated fibres forming a ribbon to join the introduced yarn end. Then the bobbin 21 begins to rotate in the normal or winding direction and simultaneously the take-off of the yarn 2 from the spinning rotor I is re-started and the feeler 31 actuated. Thus the spinning operation is re-established. Another of the ribbon removing process alternatives consists, according to the invention, in that the yarn end during said process is fixed by introducing, e.g. by means of a pneumatic effect, into a reserve tube (the so-called "third hand principle"). There it is held either by means of an air stream flowing out of another auxiliary nozzle or due to a suction effect prevailing in the reserve tube during the whole ribbon removing process. Before re-establishing the spinning process, i.e. before the spinning rotor has attained its full speed, the yarn end is introduced, either by another air stream flowing out of said other auxiliary nozzle or a suction effect or by a combination of both, into the spinning rotor for being spunin again.During the time interval for which the yarn end is held in the reserve position, it can be appropriately treated by using means not comprehended within the scope of the invention. WHAT WE CLAIM IS:-
1. A method of pneumatically removing a fibrous ribbon, together with any severed yarn end, from the spinning rotor of an open end spinning machine when there occurs an interruption of the spinning process, the method comprising the steps of withdrawing the fibrous ribbon, together with any severed yarn end, by a pressure air stream flowing in the plane of the edge of the open mouth of the spinning rotor and scavenging the spinning rotor by a second pressure air stream directed towards the collecting surface of the spinning rotor in order to remove any fibre remains.
2. An open-end spinning machine comprising a spinning rotor having an open mouth which, in the normal operating position of the spinning rotor, is masked by a cover, the spinning rotor being movable from its normal operating position to a position of relative disengagement in which a nozzle in the cover can direct a pressure air stream in the plane of the edge of the open mouth of the spinning rotor and wherein the cover also has therein an auxiliary nozzle directed, in the normal operating position of the spinning rotor, towards the collecting surface of the spinning rotor.
3. A spinning machine as claimed in claim 2, wherein in axial view of the spinning rotor in its normal operating position, a geometric projection of the auxiliary nozzle axis onto a plane perpendicular to the spinning rotor axis and crossing the collecting surface, includes an angle of from 600 to 750 with a tangent drawn through the intersection of said auxiliary nozzle axis with the collecting surface.
4. A spinning machine as claimed in claim 2 or 3, wherein the pressure air stream when flowing from both the ribbon removing nozzle and the auxiliary nozzle, can be blown intermittently in short intervals immediately following one after the other so as to improve the ribbon removing process efficiency.
5. A method of pneumatically removing a fibrous ribbon, together with any severed yarn end, from the spinning rotor of an open-end spinning machine when there occurs an interruption of the spinning process, substantially as hereinbefore described with reference to the accompanying drawings.
6. An open-end spinning machine, substantially as hereinbefore described with reference to the accompanying drawings.
T TM rT Tb A s TE T S
GB3445677A 1976-09-02 1977-08-17 Pneumatically removing fibrous ribbon together with any severed yarn end from a spinning rotor of an open end spinning machine Expired GB1577845A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS568876A CS185996B1 (en) 1976-09-02 1976-09-02 Method of and apparatus for pneumatically removing fibre ribbon or severed fibre ribbon end from open-end spinning rotor

Publications (1)

Publication Number Publication Date
GB1577845A true GB1577845A (en) 1980-10-29

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GB3445677A Expired GB1577845A (en) 1976-09-02 1977-08-17 Pneumatically removing fibrous ribbon together with any severed yarn end from a spinning rotor of an open end spinning machine

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JP (1) JPS5349130A (en)
CH (1) CH623854A5 (en)
CS (1) CS185996B1 (en)
DE (1) DE2737702C2 (en)
GB (1) GB1577845A (en)
IT (1) IT1087359B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103014945A (en) * 2011-09-21 2013-04-03 里特机械公司 Spinning machine and method for discharging an end section of a thread on a spinning machine
CN106149110A (en) * 2015-05-14 2016-11-23 里特捷克有限公司 At the work station of open-end spinning frame in a large number spin enter method and apparatus for carrying out the method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS200910B1 (en) * 1978-04-21 1980-10-31 Karel Mikulecky Method of and apparatus for spining-in yarn in open-end rotor spinning unit
JPS591732A (en) * 1982-06-21 1984-01-07 Toyota Central Res & Dev Lab Inc Open end spinning machine
DE4131666C2 (en) * 1991-09-23 1996-02-29 Rieter Ingolstadt Spinnerei Method and device for cleaning an open-end spinning rotor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1327328A (en) * 1970-10-08 1973-08-22 Daiwa Spinning Co Ltd Oepn end spinning machines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103014945A (en) * 2011-09-21 2013-04-03 里特机械公司 Spinning machine and method for discharging an end section of a thread on a spinning machine
CN106149110A (en) * 2015-05-14 2016-11-23 里特捷克有限公司 At the work station of open-end spinning frame in a large number spin enter method and apparatus for carrying out the method
CN106149110B (en) * 2015-05-14 2020-03-03 里特捷克有限公司 Method for the admission of a large number of threads at a workstation of a rotor spinning machine and device for carrying out the method

Also Published As

Publication number Publication date
JPS5349130A (en) 1978-05-04
JPS6214649B2 (en) 1987-04-03
CH623854A5 (en) 1981-06-30
DE2737702C2 (en) 1985-10-24
CS185996B1 (en) 1978-10-31
IT1087359B (en) 1985-06-04
DE2737702A1 (en) 1978-03-16

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PCNP Patent ceased through non-payment of renewal fee