GB2061338A - Method of and Device for Compensating Errors in Sliver Density Control in Textile Machines - Google Patents
Method of and Device for Compensating Errors in Sliver Density Control in Textile Machines Download PDFInfo
- Publication number
- GB2061338A GB2061338A GB8030009A GB8030009A GB2061338A GB 2061338 A GB2061338 A GB 2061338A GB 8030009 A GB8030009 A GB 8030009A GB 8030009 A GB8030009 A GB 8030009A GB 2061338 A GB2061338 A GB 2061338A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sliver
- draft
- error
- measuring instrument
- control system
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000004753 textile Substances 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
- D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
- D01H5/32—Regulating or varying draft
- D01H5/38—Regulating or varying draft in response to irregularities in material ; Measuring irregularities
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Treatment Of Fiber Materials (AREA)
- Securing Of Glass Panes Or The Like (AREA)
Abstract
The present invention relates to a method of compensating errors upon sliver density control in textile machines provided with a controlled drafting field, particularly drawframes, in which said errors are originated by dissimilar conduct of the sliver to be drafted upon scanning its density, due to different withdrawing speed and/or degree of draft. The method consists in performing corrective interventions on the basis of the known course of the error originated by dissimilar conduct of the sliver to be drafted, said interventions corresponding as to their magnitude to the predetermined error and being introduced with opposite polarity into the control system. The device for performing this method consists in interposing one function converter 7 between the measuring instrument 6 for the withdrawing speed of the sliver and the actual control system 5, and another function converter 9 between the measuring instrument 8 for the degree of draft and the actual control system 5. <IMAGE>
Description
SPECIFICATION
Method of and Device for Compensating Errors in Sliver Density Control in Textile Machines
The present invention relates to a method of compensating errors in sliver density control in textile machines which are provided with a drafting field which is controlled, particularly in drawframes, in which said errors are originated by dissimilar conduct of the drafted sliver upon scanning its density, due to different withdrawing speed and/or degree of draft.
Furthermore, the present invention relates to a device for performing the said method, said device comprising a measuring instrument for the withdrawing speed of the sliver and a measuring instrument for the degree of draft.
The hitherto existing device for measuring the mass of a bundle of textile fibres, a sliver density sensor, does not make it possible to obtain the absolutely correct value of the measured quantity upon varying a parameter, i.e. the operation speed, or upon a change in the properties of the material to be measured, e.g. the degree of draft.
The consequence of this phenomenon upon controlling the mass of a bundle of textile fibres is an error, which is measurable by e.g. the gravimetric method. This error can amount up to several per cent.
The purposes of the present invention consists in forming a method of compensating the error upon controlling the sliver density, and a device for automatic compensation of this error in the course of the controlling process.
The method according to the present invention is characterised in that method of compensating errors upon sliver density control in textile machines which are provided with a controlled drafting field, particularly in drawframes, said errors being originated by dissimilar conduct of the sliver to be drafted upon sensing its density, due to a change of the withdrawing speed of the sliver and/or the degree of draft, characterised in that on the basis of a known course of error (S), originated by dissimilar conduct of the sliver to be drafted, corrective interventions are performed which correspond, as to their magnitude, to the error (S) which was determined, and which are applied with opposite polarity to a control system of the machine.
The present invention also provides a device comprising a measuring instrument for the withdrawing speed of the sliver and a measuring instrument for the draft, characterised in that a function converter with a preset course of error (Sv) caused by a change of the withdrawing speed (v5) is interposed between the measuring instrument for the withdrawing speed (v5) of sliver and the actual control system and function converter (9) with a preset course of error (sup) caused by changing the draft is interposed between the measuring instrument for the degree of draft.
The advantage of the present invention consists in a more accurate control.
Further advantages and features of both the method and the device according to the present invention follow from the following description of an exemplary embodiment of a device operating in accordance with the method according to the present invention and shown diagrammatically in the accompanying drawing.
The control drafting device 1 comprises at least two pairs of drafting rollers 2. Behind, in the direction of movement of the drafted sliver 3, a silver density sensor 4 is mounted, the output of the sensor 4 being connected to the input 51 of control system 5. A comparative signal Uw, which indicates the required magnitude of sliver density is fed to input 52 of control system 5. The output 55 of control system 5 is connected to the control drafting device 1.
A measuring instrument for the withdrawing speed of sliver 3, e.g. a tachometer 6, is attached to the sliver density sensor 4, the output of said tachometer 6 being interconnected with the input of a function converter 7 with a preset error function dv caused by changing of the withdrawing speed v8 of sliver 3. The output of function converter 7 is connected to the input 53 of control system 5.
A measuring instrument for the degree of draft is attached to the control drafting device 1, said instrument being e.g. a tachometer 8, sensing the variable speed of rotation of one pair of drafting rollers 2 of the control drafting field. The output of the tachometer 8 is connected to the input of a function converter 9 with a preset error function dp, caused by changing the degree of draft of sliver 3. The output of action converter 9 is connected to the input 54 of control system 5.
A variable draft is achieved in the control drafting device 1 by changing the speed of rotation of one pair of drafting rollers 2 relative to the constant speed of rotation of another pair of drafting rollers 2. The signal UTP of tachometer 8, which senses the speed of rotation of one pair of drafting rollers 2, thus represents the dimension of degree of draft of sliver 3. The signal UTp is fed to the function converter 9, in which the course of error Ap, which is caused by changing the degree of draft of sliver 3, is preset.At the output of function converter 9, a signal is generated which corresponds, as to its magnitude, to error Ap for the given textile material upon measured change of degree of draft of sliver 3, but is of opposite polarity, said signal being fed into control system 5 as corrective intervention. The course of function Spf(UTp) is selected by the operator for each type of textile material on the basis of empirical testing, which is obtained upon investigation of the error due to change of draft, e.g. by the gravimetric method.
A change of the withdrawing speed v9 of sliver 3 is sensed by tachometer 6. The signal Utv, which corresponds to a change of the withdrawing speed v5, is fed to function converter 7, in which the course of error Av, which is caused by changing the withdrawing speed v, of silver 3, is preset. The course of function Av=f(UTv) is selected by the operator on the basis of empirical testing, which is obtained upon investigation of the error due to change of the withdrawing speed V5 of sliver 3, e.g. by the gravimetric method.At the output of function converter 7, a signal of opposite polarity is obtained which corresponds, as to its magnitude, to error Av for the given textile material and the determined change of the withdrawing speed v5, and which is introduced, as a corrective intervention, into control system 5.
In control system 5, the required density value of sliver 3 which is represented by comparative signal Uw is compared to the density value of sliver 3, which is obtained by the sliver density sensor 4, and which is charged with errors Sp and do due to changing the draft and the withdrawing speed v9 of sliver 3, said value being represented by signal Us+8p+8v and corrective interventions Ap and -S,. The result of this comparison is a corrected action intervention Y, which is provided at the output 55 of control system 5 and which is introduced into the control drafting device 1.
Claims (5)
1. Method of compensating errors upon sliver density control in textile machines which are provided with a controlled drafting field, particularly in drawframes, said errors being originated by dissimilar conduct of the sliver to be drafted upon sensing its density, due to a change of the withdrawing speed of the sliver and/or the degree of draft, characterised in that on the basis of a known course of error (a), originated by dissimilar conduct of the sliver to be drafted, corrective interventions are performed which correspond, as to their magnitude, to the error which was determined, and which are applied with opposite polarity to a control system of the machine.
2. A device for performing the method as claimed in claim 1, comprising a measuring instrument for the withdrawing speed of the sliver and a measuring instrument for the draft, characterised in that a function converter with a preset course of error ( v) caused by a change of the withdrawing speed (v5) is interposed between the measuring instrument for the withdrawing speed (v5) of sliver and the actual control system.
and a function converter (9) with a preset course of error (sup) caused by changing the draft is interposed between the measuring instrument for the degree of draft.
3. Device according to claim 2, in which the measuring instrument for the degree of draft comprises a tachometer sensing the variable speed of rotation of one pair of rollers of the controlled drafting field.
4. A method of compensating errors in textile machines, substantially as herein described with reference to the drawing.
5. A device as claimed in claim 2 and substantially as herein described with reference to and as illustrated in the drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS796529A CS210918B1 (en) | 1979-09-27 | 1979-09-27 | Fault remedy at control of sliver density on textile machines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2061338A true GB2061338A (en) | 1981-05-13 |
| GB2061338B GB2061338B (en) | 1983-05-18 |
Family
ID=5412538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8030009A Expired GB2061338B (en) | 1979-09-27 | 1980-09-17 | Method of and device for compensating errors in silver density control in textile machines |
Country Status (9)
| Country | Link |
|---|---|
| CS (1) | CS210918B1 (en) |
| DD (1) | DD158179A3 (en) |
| DE (1) | DE3035196A1 (en) |
| GB (1) | GB2061338B (en) |
| HU (1) | HU191808B (en) |
| IT (1) | IT1209354B (en) |
| PL (1) | PL126917B1 (en) |
| RO (1) | RO78471B (en) |
| SU (1) | SU1097726A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0192835A1 (en) * | 1985-02-15 | 1986-09-03 | Maschinenfabrik Rieter Ag | Apparatus for the continuous mass control of a fibre ribbon |
| US4974296A (en) * | 1990-02-23 | 1990-12-04 | Platt Saco Lowell Corporation, Inc. | Apparatus for correcting irregularities in a textile strand |
| US5005262A (en) * | 1988-09-21 | 1991-04-09 | Rieter Machine Works, Ltd. | Comber with electric motor driven intermittent feed roller |
| US5134755A (en) * | 1989-08-11 | 1992-08-04 | Maschinenfabrik Rieter Ag | Method and apparatus for controlling a drafting unit |
| US5152033A (en) * | 1991-07-15 | 1992-10-06 | Myrick-White, Inc. | Textile apparatus/method for reducing variations in silver weight |
| US5230125A (en) * | 1988-12-22 | 1993-07-27 | Rieter Machine Works, Ltd. | Combing machine and process for forming an even combed sliver |
| US5381651A (en) * | 1991-09-20 | 1995-01-17 | Fritz Stahlecker | Arrangement for monitoring the lap formation on drafting units of a spinning machine |
| US5394591A (en) * | 1990-09-26 | 1995-03-07 | Maschinenfabrik Rieter Ag | Autoleveller drafting arrangement with mass fluctuation control |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3635341A1 (en) * | 1986-10-17 | 1988-04-28 | Zinser Textilmaschinen Gmbh | DEVICE FOR REGULATING THE DISTANCE OF A RIBBON IN A TEXTILE MACHINE |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2448512A1 (en) * | 1974-10-11 | 1976-04-22 | Zinser Textilmaschinen Gmbh | Sliver fineness control process - has structured control times according to sliver speed between control and monitoring points |
| US4163927A (en) * | 1977-05-04 | 1979-08-07 | Fiber Controls Corporation | Auto-leveler circuit |
-
1979
- 1979-09-27 CS CS796529A patent/CS210918B1/en unknown
-
1980
- 1980-08-20 SU SU807771335A patent/SU1097726A1/en active
- 1980-08-25 DD DD80223554A patent/DD158179A3/en not_active IP Right Cessation
- 1980-09-17 GB GB8030009A patent/GB2061338B/en not_active Expired
- 1980-09-18 DE DE19803035196 patent/DE3035196A1/en not_active Withdrawn
- 1980-09-25 HU HU802340A patent/HU191808B/en not_active IP Right Cessation
- 1980-09-26 IT IT8024938A patent/IT1209354B/en active
- 1980-09-26 RO RO102229A patent/RO78471B/en unknown
- 1980-09-27 PL PL1980226949A patent/PL126917B1/en unknown
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0192835A1 (en) * | 1985-02-15 | 1986-09-03 | Maschinenfabrik Rieter Ag | Apparatus for the continuous mass control of a fibre ribbon |
| US4646387A (en) * | 1985-02-15 | 1987-03-03 | Maschinenfabrik Rieter Ag | Arrangement for continuously determining the density of a web of fiber sliver |
| US5005262A (en) * | 1988-09-21 | 1991-04-09 | Rieter Machine Works, Ltd. | Comber with electric motor driven intermittent feed roller |
| US5230125A (en) * | 1988-12-22 | 1993-07-27 | Rieter Machine Works, Ltd. | Combing machine and process for forming an even combed sliver |
| US5134755A (en) * | 1989-08-11 | 1992-08-04 | Maschinenfabrik Rieter Ag | Method and apparatus for controlling a drafting unit |
| US4974296A (en) * | 1990-02-23 | 1990-12-04 | Platt Saco Lowell Corporation, Inc. | Apparatus for correcting irregularities in a textile strand |
| US5394591A (en) * | 1990-09-26 | 1995-03-07 | Maschinenfabrik Rieter Ag | Autoleveller drafting arrangement with mass fluctuation control |
| US5152033A (en) * | 1991-07-15 | 1992-10-06 | Myrick-White, Inc. | Textile apparatus/method for reducing variations in silver weight |
| US5381651A (en) * | 1991-09-20 | 1995-01-17 | Fritz Stahlecker | Arrangement for monitoring the lap formation on drafting units of a spinning machine |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1209354B (en) | 1989-07-16 |
| DD158179A3 (en) | 1983-01-05 |
| RO78471A (en) | 1984-08-17 |
| DE3035196A1 (en) | 1981-04-16 |
| IT8024938A0 (en) | 1980-09-26 |
| SU1097726A1 (en) | 1984-06-15 |
| PL126917B1 (en) | 1983-09-30 |
| HU191808B (en) | 1987-04-28 |
| CS210918B1 (en) | 1982-01-29 |
| PL226949A2 (en) | 1981-06-05 |
| RO78471B (en) | 1984-09-30 |
| GB2061338B (en) | 1983-05-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |