EP1009870A1 - Banc d'etirage regule - Google Patents

Banc d'etirage regule

Info

Publication number
EP1009870A1
EP1009870A1 EP98938866A EP98938866A EP1009870A1 EP 1009870 A1 EP1009870 A1 EP 1009870A1 EP 98938866 A EP98938866 A EP 98938866A EP 98938866 A EP98938866 A EP 98938866A EP 1009870 A1 EP1009870 A1 EP 1009870A1
Authority
EP
European Patent Office
Prior art keywords
drafting
drafting system
sliver
speed
card
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
Application number
EP98938866A
Other languages
German (de)
English (en)
Other versions
EP1009870B2 (fr
EP1009870B1 (fr
Inventor
Christian Müller
Jürg Faas
Beat Näf
Christian Grieshammer
Götz Theodor GRESSER
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.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27173074&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1009870(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE1997138053 external-priority patent/DE19738053A1/de
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Priority to DE29825170U priority Critical patent/DE29825170U1/de
Publication of EP1009870A1 publication Critical patent/EP1009870A1/fr
Application granted granted Critical
Publication of EP1009870B1 publication Critical patent/EP1009870B1/fr
Publication of EP1009870B2 publication Critical patent/EP1009870B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D01G15/64—Drafting or twisting apparatus associated with doffing arrangements or with web-dividing apparatus
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
    • D01G31/006—On-line measurement and recording of process and product parameters

Definitions

  • the invention relates to a drafting system with a drive, which has a regulating device for regulating mass fluctuations of a fiber mass supplied to the drafting system from a supply source, the mass fluctuations being detected by at least one measuring element assigned to the drafting system and being output to a control unit
  • the card works with a constant (adjustable) delivery, i.e. the sliver runs out of the outlet at a predetermined speed.
  • the work of the regulating drafting system requires a variable (controllable) delay.
  • the provision of a large band storage between the card spout and the drafting system inlet is undesirable. It follows that the delivery speed of the drafting system must be variable. However, this fact leads to problems in Connection with the drive for the relatively sluggish sliver reel following the drafting system.
  • a belt store being arranged between the card and a subsequent regulating drafting device.
  • a conveyor belt driven by a separate motor is arranged after the regulating drafting system.
  • the actual values determined by the pair of measuring rollers in front of the regulating drafting system are compared with predetermined target values.
  • the resulting signal is used to control the drive motor for the input roller pair of the drafting system in order to change the draft or to regulate thin or thick points.
  • this signal is also transmitted to the controller for the drive of the sliver source or the card, so that it can be adjusted accordingly.
  • the card reacts much more slowly to such changes in speed than is the case with the drafting system.
  • the resulting differences in the material delivery and material intake are compensated for by the memory following the card.
  • the memory is provided with sensors for monitoring the memory content.
  • the drive of the sliver source (card) and the sliver take-up device (sliver storage) is changed accordingly in order to keep the fill level of the sliver store approximately constant.
  • this readjustment of these two drives again brings about additional differences, especially since the elements of the card (e.g. spool) have different inertias than the elements of the tape storage.
  • the delivery speed of the card should be increased as soon as the downstream belt store empties beyond a predetermined amount, in order not to endanger the production of the following section.
  • the arrangement shown is suitable to compensate for briefly occurring high mass fluctuations (lack of a sliver). Compensation for long-wave deviations is not provided, however, or is solved unsatisfactorily.
  • DE-A1 29 12 576 proposes that the thickness of the sliver discharged from the card is measured and compared with a target value.
  • the signal determined from this is used to control the material feed device (feed roller) which is upstream of the card.
  • feed roller material feed device which is upstream of the card.
  • This device it is possible to react to long-wave deviations in the mass of the card sliver supplied.
  • the avoidance and elimination of short-wave disturbances for example by connecting a regulating drafting system, is not provided here.
  • the intervention in the control of the drive of the feed roller to compensate for long-wave mass deviations only takes effect after a longer time delay.
  • the drafting system is assigned at least one further means which is suitable for detecting a necessary control intervention in the drafting system drive in order to maintain a predetermined target value before or during the control intervention and for influencing the basic speed of the drafting arrangement.
  • any storage that may be required between the textile processing machine and the downstream regulating drafting system can be kept relatively small, since the control interventions are compensated for by tracking the basic speed of the drafting system.
  • a safety device is obtained which ensures that the drive speed (basic speed) does not drift against a basic setting.
  • the further means is preferably suitable for detecting differences between the delivery speed of the source and the entry speed into the drafting system.
  • the difference in speed results from the change in the speed of the regulated drafting roller.
  • the further means can also be suitable for detecting long-term fluctuations in mass with respect to a predetermined target value (target).
  • the further means is preferably a sliver store, which can be equipped with corresponding monitoring elements or sensors.
  • the differences in the conveying speed of the sliver, which result from the variable and regulated take-off speed of the pair of input rollers of the drafting unit, can be recognized on the basis of the variable fill level of the accumulator and an intervention into the basic speed of the drafting device can be carried out. A pre-control is thus carried out, which ensures that the memory can be kept at a low level.
  • the sliver storage can be listed as a sag storage, the sagging of the sliver loop can take place continuously or discontinuously.
  • an additional sensor for detecting the fiber mass is provided, which can be arranged directly after the outlet of a textile material processing unit upstream of the drafting system. This makes it possible to detect long-term mass deviations very early and to react with a corresponding intervention in the basic speed of the following drafting system.
  • the textile processing unit can be a card, the sensor attached to the card outlet being able to be used simultaneously for long-term regulation of the card feeding device.
  • the further means can also consist of a sensor device for sensing the speed of the regulated roller pair of the drafting system and at least one conveyor roller pair for the fiber mass which is connected upstream and constantly rotating upstream of the drafting system, the long-term rate being determined by the determined speed ratio Deviation in mass is determined and corresponding interventions in the basic speed of the drafting system are carried out.
  • the supply source consists of at least two cards connected in parallel, the drive of the second card tracking the drive of the first card and the fiber material emitted by the respective card being detected by a sensor and that by Mixed signal formed by both sensors is used to influence the base speed of the drafting system.
  • the sliver storage can advantageously be provided with a monitoring device.
  • the monitoring device of the sliver storage of the second, tracked card can be used to override the control coupling of the drives of both cards. This makes it possible to compensate for short-term drifting in the production of the second card. This means that the drive of the take-off roller of the second card is readjusted until the sliver loop in the sliver storage is again within predetermined tolerance limits. This override can be limited in time, i.e. if there is a longer deviation, it is assumed that there is an error, so that the machines are stopped for checking.
  • Sag sensors can be used as monitoring sensors which continuously or discontinuously monitor the sag of the fiber slivers in the storage. Furthermore, it is proposed that the drafting unit is followed by a belt deposit and the warping of the drafting unit is so high that it is ensured that the degree of fiber orientation in the sliver formed is significantly increased or the proportion of hook fibers is significantly reduced. Information about stretching before laying down can be found in the book “Shortened Cotton Spinning - Prof. Dr. Ing. Walther Wegener - Mönchengladbach 1965 ". This will be discussed in more detail below.
  • the delay is greater than 2, preferably between 3 and 6. This is also intended to ensure that a sliver with a high-quality fiber structure is formed, which has a particularly positive effect in subsequent processing stages.
  • the tape-forming device should preferably produce a sliver with a relatively low fineness (great strength), for example at least 8 ktex and preferably 10 ktex or even more (for example 12 ktex) .
  • the card is preferably worked with a relatively large working width, for example greater than 1200 mm. This can be done with a machine according to our EP patent application No. 866 153. The entire content of the mentioned EP application is hereby incorporated into the integral part of the present description.
  • the belt fineness after the drafting system can be, for example, 3 to 5 ktex.
  • the delivery speed at the exit of the drafting system is, for example, more than 400 m / min.
  • Such a drafting system is preferably on the belt deposit provided (cf. the specialist book "Shortened Cotton Spinning Mill, page 72 and the CS patent 98 939 mentioned therein), so that the sliver supplied by the drafting system can be deposited as quickly as possible (without having to travel a long transport route).
  • FIG. 2 shows a further embodiment according to FIG. 1,
  • FIG. 3 shows a further embodiment according to FIG. 1,
  • FIG. 5 shows a schematic representation in diagram form of the mass profile of the card sliver in connection with the adjusted speed curve of the drafting system.
  • FIG. 1 shows schematically the representation of a card 1, which is fed with fiber material via a feed shaft 3 and a subsequent feed roller 2.
  • the fiber material is taken up by the reel and processed in cooperation with carding elements, not shown.
  • the carded material is removed from the reel 4 by a take-off roller 5 and transferred to a schematically indicated take-off device 10, from which take-off device 10 the sliver 6 formed there arrives in the conveying direction F to a sag storage 14 which is equipped with input roller pairs 15 and with output roller pairs 16.
  • the sag (sliver loop FS) is scanned by a bar sensor 20 which is provided with sensors arranged one above the other in a row. This makes it possible to detect each position of the sliver loop FS exactly.
  • the sensor signals are emitted to a control unit S via line 21.
  • This control unit S controls the drive motor M1 of the take-off roller 5 via the control line 7.
  • the sliver 6 emitted by the memory 14 is passed through a measuring element 70, which is designed in the form of a pair of sensing rollers.
  • the measurement result of the measuring element 70 is delivered to the control unit S via the line 71.
  • the fiber sliver is guided into the drafting unit 30 with the roller pairs 24 and 25, in which it is warped.
  • the basic drive of the drafting unit 30 takes place from the motor M2, which is controlled by the control unit S via the line 40.
  • the motor M1 of the take-off roller 5 is designed as a guide motor (master), to which the basic speed of the motor M2 is tracked as a “slave” in order to maintain predetermined drive conditions.
  • This basic speed of the motor M2 can be overridden by the signals from the sensor 20 which will be discussed in more detail below.
  • the motor M2 drives a gear 32, from which a drive path 35 leads to the output rollers 25 and a further drive path 36 to a control gear 33 (differential).
  • the input roller pair 24 of the drafting unit 30 is driven by this control gear 33 via the drive path 37.
  • control interventions which are carried out by evaluating the signals of the measuring element 70 on the basis of a predefined setpoint for regulating mass fluctuations (short and long-wave) are necessary, take place from a control motor M3, which is controlled by the control unit S via the line 38 and which regulatively engages in the control gear 33. This changes the distortion between the pairs of rollers 24 and 25 and compensates for fluctuations in mass in the sliver.
  • the pair of measuring rollers 70 are driven via the drive connection 68, which is removed from the drive path 37. This determines the synchronism between the pair of input rollers 24 and the pair of measuring rollers 70.
  • the changes in the speed of the input roller pair 24 act backwards against the conveying direction F and are absorbed in the memory 14 by changing the loop position FS.
  • the loop position can be scanned in steps, whereby the control unit S overrides the basic speed of the drive motor M2 for a certain amount of change. This reduction or increase in the basic speed compensates for the effect of the speed change through the control intervention, in particular when regulating long-term mass fluctuations.
  • the memory can therefore be kept to a minimum size.
  • the sag of the loop FS decreases with the delivery of the take-off roller 5 remaining the same. This is detected by the sensor 20 and the base speed of the motor M2 is correspondingly reduced. As a result, the rotational speed of the input rollers also decreases with the same changed draft ratio in the drafting system 30, as a result of which the sliver loop is returned to its original position.
  • the drive of the following belt storage device 60 is firmly coupled, specifically via the drive path 42, which is removed from the gear 32 and leads to a gear 50.
  • the calender rollers 47, the hopper wheel 48 and the can plate 49 are driven by the transmission 50 via the drive path 51 shown schematically.
  • a monitoring element 44 which is connected to the control unit S via the line 45. This is used for the final monitoring of the number of the sliver formed and switches off the machine if the number is outside a certain tolerance range for a predetermined period of time.
  • the sliver is deposited over the calender rollers 47 and the funnel wheel 48 into a can K in the form of a loop, the can K being rotated over the can plate 49 during the depositing process.
  • FIG. 2 A device is shown in FIG. 2, a pair of measuring rollers 55 being arranged after the take-off device 10, which pair is connected to the control unit S via the line 56.
  • This measuring element 55 essentially records the long-term fluctuations in mass (drifting of the number of the sliver).
  • a control signal is generated in the control device which is used to override the basic speed of the motor M2.
  • a subsequent control intervention in the drafting system 30 can be reacted to at an early stage in order to keep the storage at a constant level of the sliver loop.
  • the memory 14 is here only provided with two sensors S1 and S2, which only respond when the sliver loop FS moves outside of a predetermined tolerance range. As a rule, there is a fault and the machine (system) is switched off.
  • the signal from the measuring element 55 is also used to regulate the drive motor MS of the feed roller of card 1 in order to regulate the drift of the number already on the card.
  • the motor MS is controlled by the control unit via line 53.
  • the remaining elements correspond to the exemplary embodiment in FIG. 1, which is not discussed in more detail here.
  • Fig. 3 shows a further embodiment, wherein a pair of take-off rollers 11 is arranged after the take-off device 10. The speed of this pair of rollers is monitored by a sensor 12. Likewise, a speed sensor 62 is assigned to the pair of intake rollers 24 of the drafting unit 30, which is connected to the control unit S via the line 63.
  • the design of the memory 14 corresponds to the design which has already been described in the exemplary embodiment in FIG. 2.
  • the measured speed ratio between the roller pairs (11, 24) mentioned remains constant.
  • a control intervention takes place, as a result of which the speed of the input rollers 24 changes.
  • the speed ratio between the roller pairs 11 and 24 also changes, whereby a control signal S is generated in accordance with the change, which changes or overrides the basic speed of the drafting unit 30 or the motor M2, in order to, as in the example in FIG 2 described to compensate for the control intervention.
  • the compensation of the control interventions by overriding the basic speed of the drafting system 30 relates only to the long-term fluctuations in mass and not to the short-term, since these fluctuations are insignificant and generally compensate for themselves over time.
  • 4 shows an embodiment in which two cards 1 a, 1 b work in parallel next to one another. The cards are also provided with feed rollers 6a, 6b, briseur 3a, 3b, reel 2a, 2b and take-off roller 4a, 4b.
  • the drive of the take-off rollers 4a and 4b is indicated schematically at 75 or 46, which are connected to the control unit S via a control line L8 or L9.
  • the drive 20a or 20b of the feed rollers 6a or 6b is likewise connected to the control unit S via the control lines L7 'or L7 ".
  • the control unit S and the respective control lines L8 and L9 ensure that the speeds of the pickup rollers 4a and 4b are coordinated with one another, that is to say the drive 46 of the pickup roller 4b is tracked as a “slave” to the drive 75 of the pickup roller 4a, which acts as a “master”.
  • the slivers Fa and Fb emitted by the respective card 1 a or 1 b are passed through a sensor 10a or 10b in order to sense their mass.
  • the fiber tapes Fa and Fb then each pass into a slack store 11 a and 11 b.
  • Sensors 01, U1 and 02, U2 are attached in these memories for scanning the fill level or the sag of the sliver loops.
  • the sensors U1, U2 sense an upper and the sensors U1, U2 a lower position of the sliver loop. Between the respective upper sensor and the lower sensor there is the tolerance limit within which the sliver loop can move freely without triggering a control intervention. However, it would also be conceivable to provide a sensor with continuous scanning.
  • the sensors 01, U1 and, 02, U2 are connected to the control unit S via the lines L10 and L11.
  • the two slivers Fa and Fb are brought together to form a single sliver FZ.
  • This Sliver FZ is then passed over a sensor 17, which carries out the scanning of mass fluctuations in the sliver FZ presented.
  • the fiber sliver FZ sensed by the sensor 17 then arrives in the regulating drafting unit 83.
  • the values determined by the sensor 17 are output to the control unit S via the line L3.
  • the drafting system 83 consists of three roller pairs 84, 85 and 86 connected in series, the input roller pair 84 being driven to change the speed in order to regulate mass fluctuations in the sliver.
  • the delivery roller pair 86 is driven by a main motor 65 and a subsequent gear 26 at a constant speed.
  • the middle pair of rollers 85 is also driven at a constant speed and has a constant speed ratio to the subsequent delivery rollers 86.
  • a constant warping of the sliver between the roller pairs 85 and 86 is carried out by the predetermined speed ratio.
  • the motor 85 is controlled by the control unit S via a frequency converter 84 and via the line L6.
  • a differential gear 28 is driven via the drive connection 92 and drives the pair of input rollers 84 via the drive train 31.
  • the drive of the differential 28 can be overridden by a control motor 29 which is controlled via a frequency converter (not shown) and the line L5 via the control unit S. This override takes place on the basis of the signals emitted by the sensor 17, which are compared with an actual value stored in the control unit S.
  • a band storage device KA in which the sliver F1 delivered by the drafting unit is deposited in a can K via a pair of calender rollers 34 and a funnel wheel T.
  • the can K stands on a driven can plate (not shown) which rotates the can K during the filling process.
  • the calender rolls 34 and the hopper wheel T are driven by one via the drive path 98 Gearbox 96 driven.
  • the transmission 96 receives its drive via the schematically shown fixed drive connection 95 of the transmission 26, which is driven by the main motor 65. It can be seen from this that the pair of delivery rollers 86 are firmly coupled to one another directly with the drive elements of the tape storage unit KA via the transmission 26.
  • a mixed signal MS is generated from the signals of the sensors 10a and 10b in the control unit S and is compared with a target value.
  • the control signal SS resulting from this comparison is used to influence the set base speed of the motor 65.
  • the basic speed of the drafting system is matched to the speed of the take-off roller 4a or tracked. Overriding of the basic speed is only released when the operating speed is reached.
  • the slivers Fa and Fb emitted by the cards 1 a and 1 b are detected by the sensors 10a and 10b and the corresponding actual values (mass) are emitted to the control unit, where a mixed signal MS is generated. This mixed signal is compared with a target signal "target" and a control signal is generated therefrom if the actual value deviates from the target value.
  • This control signal goes to a frequency converter 94 which changes the speed of the motor 65 via line L6 and thus the basic speed of the drafting unit and also It should be noted that the long-wave mass deviations measured with sensors 10a and 10b are also used to control drives 20a and 20b of feed rollers 6a and 6b of cards 1a, 1b. The drives are via the control lines L7 'and L7 "connected to the control unit S. After leaving the sensors 10a and 10b, the fiber tapes Fa and Fb are transferred to the sag stores 11a and 11b, in which they are scanned by sensors 01, 02 and U1, U2, respectively. If the respective sliver loop is within the area between the upper and lower sensor, no additional control pulse is carried out.
  • the direct tracking of the drive 46 of the take-off roll 4b is overridden by the drive 75, which is considered the “master” and the speed of the roll 4b is reduced.
  • the sliver loop moves back into the tolerance range between 02 and U2, the control coupling between the drives 65 and 46 is reactivated. If the sliver loop does not return to the tolerance range after a predetermined time, there is a fault, which shuts down the entire system.
  • the situation is similar with the monitoring in the memory 11a, the system also being switched off when the sliver loop of the sliver Fa moves outside the tolerance range between the sensors U1 and 01 and for a predetermined time, since a fault can be assumed.
  • the fiber slivers leaving the respective store are brought together to form a common fiber sliver FZ before entering a subsequent measuring element 17.
  • the mass fluctuations are measured in the measuring element and sent to the control unit S via the line L3.
  • a setpoint-actual value comparison in the control unit sends a corresponding signal via line L5 to the control motor 29, which changes the speed of the input rollers 84 to regulate the mass fluctuation via the control gear 28. This changes the delay between the roller pairs 84 and 85. The distortion between the roller pairs 85 and 86 remains constant.
  • the fiber strip F1 warped in this way is delivered by the drafting unit and placed in a can K in a loop via the calender rollers 34 and the funnel wheel T.
  • the total draft of the drafting system 83 is selected to be greater than 3, since this can partially dissolve the drag hooks that are produced on the card during the removal process of the fiber material during the drafting process, which has an advantageous effect on subsequent processing processes.
  • a drifting of the mass m outside of a predetermined tolerance range To is determined via the sensors 10a, 10b at the time T1. If the mass were to drift at time T1 without intervention in the base speed, the process would be as follows: due to the lower mass presented to the drafting unit 83, the distortion between the roller pairs 84 and 85 must be reduced. This means that the speed of the input roller pair 84 is increased via the control motor 29 and the differential 28, which simultaneously reduces the distortion between the roller pairs 84 and 85, since the speed of the roller pair 85 remains constant. By reducing the Speed of the input roller pair 84, the feed speed of the sliver F supplied is reduced.
  • the original delivery speed of the sliver from the card remains the same.
  • the resulting difference between the delivery speed of the card and the changed feed speed of the sliver in the drafting system 83 is absorbed by the sliver storage 11 a or 11 b.
  • This compensation can then be brought about again as soon as the control intervention in the feed roller 6a, 6b produces its effect when it is delivered to the card.
  • the speed of the drive elements of the belt storage is also reduced synchronously, whereby the speed ratio between the delivery roller 86 and the calender rollers 34 is maintained.
  • This balance The long-wave drifting of the sliver mass can be carried out relatively gently and slowly, so that the tracking of the relatively sluggish elements of the sliver storage unit KA poses no problems.
  • the proposed device on the one hand, it is possible to react in good time to long-wave deviations in the sliver mass with known sensor devices and, on the other hand, to keep the sliver storage required for regulation at the entrance of the drafting system to a minimum.
  • the invention is concerned with improving the degree of fiber orientation or reducing the number of fiber hooks (fiber hooks) in the card sliver.
  • card sliver here means a sliver that is delivered to a sliver reel following the card.
  • EP-A-544 426 where a delay between 6 and 8 is suggested, although significantly higher delays (12 or even 30) are mentioned. Nevertheless, direct spinning of card sliver (without a section passage) has not yet been achieved using the rotor spinning process.
  • the second aspect of the invention provides a method for forming a card sliver, according to which a card web is combined to form a fiber sliver, the fiber sliver is stretched and the stretched sliver is laid down, characterized in that the fiber sliver is subjected to such a high distortion during stretching that the degree of fiber orientation is significantly increased or the proportion of hook fibers is significantly reduced.
  • This aspect of the invention provides a corresponding device with a drafting device for use between the tape-forming device and the tape deposit of a card, characterized in that the drafting device can produce such a high degree of warping that it significantly increases the degree of fiber orientation in the tape Share of hook fibers is significantly reduced.
  • the stretching of the sliver upstream of the laying down can be used to significantly reduce the proportion of drag hooks (cf. the specialist book "Shortened Spinning Mill", page 90).
  • the sliver it is expedient to subject the sliver to a warping of more than 2 and preferably more than 3. If possible, a delay of 5 to 6 should be used, but this can only rarely be achieved between the card spool and the subsequent sliver reel without disturbances in the running behavior of the sliver.
  • the tape-forming device should preferably produce a sliver with a relatively low fineness (great strength), e.g. at least 8 ktex and preferably 10 ktex or even more (e.g. 12 ktex).
  • the card is preferably operated with a relatively large working width, e.g. larger than 1200 mm. This can be done with a machine according to our EP patent application No. 98 810 088.9. The entire content of the mentioned EP application is hereby incorporated into the integral part of the present description. The EP application is expected to be published on September 23, 1998 under number 866 153.
  • the belt fineness after the drafting system can be, for example, 3 to 5 ktex.
  • the delivery speed at the exit of the drafting system is, for example, more than 400 m / min.
  • Such a drafting system is preferably provided on the belt storage (cf. the specialist book "Shortened Cotton Spinning Mill, page 72 and the CS patent 98 939 mentioned therein), so that the sliver supplied by the drafting system is deposited as quickly as possible (without having to go through a long transport route) can be.
  • the second aspect of the invention accordingly provides a method, according to which a card web is combined to form a fiber sliver and the sliver is stretched with a delay of at least 2 and preferably more than 3 before it is deposited.
  • the invention provides in this aspect a card with a sliver-forming device, a sliver and a drafting device connected between the sliver-forming device and the sliver, the drafting device being designed to produce a draft higher than 2 and preferably higher than 3.
  • the drafting system can be formed as an equalization unit, i.e. it can be arranged to generate a controllably variable delay, but this is not essential to the invention. Changes in default will lead to corresponding changes in the degree of orientation.
  • the card itself can therefore be expediently designed as a leveling unit (e.g. according to EP-A-271 115), the subsequent drafting system being designed to increase the degree of fiber orientation.
  • a regulated drafting system preferably has a total draft GV (between the inlet and outlet roller pairs) of more than 2 and preferably 3 to 6. If the drafting system has a pre-draft field, which is not essential to the invention, the average draft in the regulated (variable) Delay field, for example, be approximately 2.5, the delay in the other (fixed) delay field, for example, be approximately 1, 2.
  • the "early delay” (in the first delay field) can be, for example, approx. 1.1 to 1.5, and the "main delay” (in the second, variable delay field) approx. 2.0 to 4.
  • the sliver thickness at the outlet of the drafting system is preferably 3 to 5 ktex, for example 3.5 ktex.
  • the drafting system is preferably arranged directly above the hopper wheel of a belt deposit, for example as shown in DE-Gbm-296 22 923.
  • the sliver deposited in the can can be delivered directly to the OE spinning machine, for example according to EP-A-627 509.
  • the second aspect of the invention is preferably (but not necessarily) used in combination with the other features of the invention described in the introduction.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

L'invention concerne un banc d'étirage (30) comportant un système d'entraînement (M2) et un système de régulation (M3) pour la compensation des variations de masse d'une masse fibreuse (6) acheminée au banc d'étirage par une source d'alimentation (1), ces variations de masse étant détectées par au moins un organe de mesure (70) associé au banc d'étirage (30) et étant transmises à une unité de commande (S). Dans le but d'éliminer les problèmes de configuration des unités d'accumulation et pour des raisons de sécurité, un autre organe (11, 12, 62, 63) est associé au banc d'étirage (30). Cet organe est approprié pour détecter des différences entre la vitesse d'alimentation de la source (1) et la vitesse d'entrée dans le banc d'étirage (30), et les utiliser en vue d'influer sur la vitesse de base de ce banc, ou bien pour détecter les variations de masse à long terme par rapport à une valeur théorique prédéfinie (théorique), ces écarts déterminés étant utilisés pour influer sur la vitesse de base du banc d'étirage.
EP98938866A 1997-09-01 1998-08-31 Banc d'etirage regule Expired - Lifetime EP1009870B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29825170U DE29825170U1 (de) 1997-09-01 1998-08-31 Reguliertes Streckwerk

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE1997138053 DE19738053A1 (de) 1997-09-01 1997-09-01 Karde mit Bandspeicher und Regulierstreckwerk
DE19738053 1997-09-01
CH271197 1997-11-24
CH271197 1997-11-24
CH156098 1998-07-23
CH156098 1998-07-23
PCT/IB1998/001357 WO1999011847A1 (fr) 1997-09-01 1998-08-31 Banc d'etirage regule

Publications (3)

Publication Number Publication Date
EP1009870A1 true EP1009870A1 (fr) 2000-06-21
EP1009870B1 EP1009870B1 (fr) 2002-07-03
EP1009870B2 EP1009870B2 (fr) 2008-09-17

Family

ID=27173074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98938866A Expired - Lifetime EP1009870B2 (fr) 1997-09-01 1998-08-31 Banc d'etirage regule

Country Status (5)

Country Link
US (1) US6286188B1 (fr)
EP (1) EP1009870B2 (fr)
DE (1) DE59804686D1 (fr)
TR (1) TR200000962T2 (fr)
WO (1) WO1999011847A1 (fr)

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Also Published As

Publication number Publication date
TR200000962T2 (tr) 2001-07-23
EP1009870B2 (fr) 2008-09-17
DE59804686D1 (de) 2002-08-08
US6286188B1 (en) 2001-09-11
EP1009870B1 (fr) 2002-07-03
WO1999011847A1 (fr) 1999-03-11

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