Autoleveller TEXCONTROL RRC.

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Autorregulador TEXCONTROL RRC

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Location

Badalona (Barcelona)

Opening hours

Monday - Friday
9:00 - 18:00

HOW DOES THE TEXCONTROL RRC WORK?


Learn more about the Autoleveller Texcontrol RRC

The TEXCONTROL RRC “Card Sliver Autoleveller”, is an independent unit placed at the delivery of the card. It acts directly on the sliver through a variable drafting arrangement and not through the card feed. The latter process has a very high inertia and does not enable short term adjustment to be made. The TEXCONTROL RRC is the only type of autoleveller to pro¬duce very short term regularity due to the extremely low inertia of the mechanical parts used in the regulating process.

Only the drafting rollers are controlled by a special variable speed motor. The TEXCONTROL RRC measures the instantaneous variations in sliver weight at the card delivery trough a tongued and grooved roller sensing device, which is unaffected by variations in humidity. This drafting range consists of a pair of feed rollers and a pair of delivery rollers, the latter being driven by a variable speed motor with very low inertia.

The variations in drafting continually compensate the sliver count variation which is measured by the mechanical feeler. The TEXCONTROL RRC corrects the sliver count variations on lengths below 10 cm. (the theoretical limit of adjustment is 2,5 times the average staple length).

The stability of the measuring and calculating components is such that a consistent sliver weight is maintained over very short lengths (below 10 cm) and over very long periods of time (for several weeks without any adjustment to the draft). As the sliver speed varies at the delivery of the TEXCONTROL RRC, the speed of the coiler must also vary. This is obtained through a coiler motor, which is also controlled by the Computer of the TEXCONTROL RRC. Normal stopping and starting of the card has no effect on the autoleveller.

Autoleveller Texcontrol RRC operating principle

HOW LONG HAS THE TEXCONTROL RRC BEEN IN OPERATION?


Since 1973 experience has proved that:

  1. in open-end spinning: the cleaning action of the combing roller is largely improved when fed with card sliver regularized by the TEXCONTROL RRC, rather than sliver from a second drawing passage. It is therefore an advantage to feed the regularized card sliver direct to the open-end spinning-frame.
  2. in conventional spinning:
         - it was possible to eliminate the drawing passages completely.
         - it was possible to feed the TEXCONTROL RRC sliver direct to the speed-frame.
         - the end breakage rate per 1000 spindle/hours was reduced by more than half, because thin places in the sliver were eliminated.
         - The quality of woven and knitted fabric, produced from regularized sliver, was considerably improved.

Why the TEXCONTROL RRC?


Today, thanks to the TEXCONTROL RRC, it is possible to eliminate the drawing passages during open-end and conventional spinning.

Until now, no card sliver autoleveller was capable of adjusting both very short term variations (below 10 cm) and maintaining this over very long periods (over several weeks).

Formerly, very short term regulation was only possible by successive doublings.

Today, thanks to the TEXCONTROL RRC, it is possible to eli¬minate the drawing passages during open-end and conventional spinning.

The TEXCONTROL RRC is independent from the control of the card but acts directly on the card sliver by drafting, and there- by levelling out, any variations.

The TEXCONTROL RRC is placed between the card delivery and the coiler. It is easily fitted to most types of existing cotton cards.

Using the TEXCONTROL RRC, the card sliver can be fed either direct to the speed frame or to the OE spinning frame.

Characteristics


  • - The TEXCONTROL RRC can be fitted to new or existing cards.
  • - The TEXCONTROL RRC can be fitted to most cotton cards, including high production cards (up to 55 kg/hour).
  • - Sliver count at feed of autoleveller (card delivery): from 2 to 6 KTex (from 2 to 6 grm/m).
  • - Count at delivery of TEXCONTROL RRC : 3 to 6 KTex.
  • - Linear adjustment: for sliver weight variations at feed of ± 20%.
  • - Total adjustment: for sliver weight variations at feed from -25% to +45%.
  • - Drafting range: from 1.22 to 1.68 (electronically adjusted without gears change).
  • - Sliver weight correction at delivery by simple electronic adjustment.
  • - It is possible to check variations in sliver weight at feed and the card speed (belt slippage).
  • - Sliver regularity at delivery of TEXCONTROL RRC.
         18% on Sliver Tester (very short term).
         2.5% on electronic evenness tester.
         1% on weight of 4 m (long term).
  • - Safety device which stops the card automatically in the event of:
         a) over-weight of sliver at card delivery (overload of drafting motor).
         b) sliver break between the TEXCONTROL RRC and the coiler.
         c) underfeed of TEXCONTROL RRC (weight of sliver too light at card delivery).
  • - Voltage of Computer: 220 V - 16 AMP - 50 Hz.

Advantages


The Autoleveller TEXTCONTROL has a wide variety of advantages. ¡Discover them!

  • - The results obtained with the shortened spinning process (without drawing passages) are in all respects comparable to those obtained by a conventional spinning process.
      Certain characteristics are even superior:
         - long term yam regularity (CV number).
         - reduction of bars in woven and knitted fabrics.
         - reduction in end-breakage rate during spinning.
         - reduction in labour cost and therefore appreciable financial savings.
  • - Reduced capital investment and savings in floorspace.
  • - Requires little maintenance. The drafting arrangement can be vacuum cleaned at the same time as the card.
  • - Very high reliability of all components.
  • - Easily installed on existing cards.
  • - High production.
  • - Can be used on tandem cards.

Return of investment


  • - Elimination of two drawing passages considerably reduces:
         a) labour cost
         b) investment cost
         c) floorspace requirements
  • - Reduced end-breakage rate.
  • - Reduced CV of yarn.
  • - Improved yarn quality.
  • - Improved quality of woven and knitted fabrics, giving superior appearance.
  • - When setting up a new spinning plant, dispensing with 2 drawing passages, one of which would be equipped with an autoleveller, already compensates for the cost of the TEXCONTROL RRC.
  • - Power consumption and maintenance of the TEXCONTROL RRC are extremely low; the savings are substantial.

The above characteristics may be modified without prior notice. They are also influenced by the care given in the preparation and by the nature of the raw materials.

The consumption and maintenance of Autoleveller TEXCONTROL are minimal.

Autoleveller AA-5


Aim

This regulator aims at obtaining as constant as possible a sliver title at the outlet of the card. At the outlet of the regulator, constancy of the title is insured as well at short term (below 4 inches) as at long term over several weeks.

Such evenness is ensured whichever the origin of the variations of the sliver or web title at entrance of the regulator.

It thus enables to obtain a sliver title which remains unchanged with respect to the various characteristics of the cotton, defectives of the feed system of the card or the card itself.

A sliver provided by the regulator may be used to feed directly the open end spinning frame or, in the conventional spinning system, to feed directly a special flying frame with a doubling of 4. In both cases, drawing frames are eliminated.

This system increases production and quality.

Functional Principle

The evenness of the sliver is obtained by giving to the input sliver a variable draft which is a function of the variation of the title of the sliver at the input.

At the input of the regulator, the web which is gathered into a sliver runs between 2 rollers, the upper one is a tongued roller and the lower one a grooved roller. The distance between these two rollers is a function of the instantaneous title of the web.

This distance is transformed by an electronic transducer into an electronic signal. This signal will be used to control the speed of a special motor which drives the drafting rollers in such a way that the draft given to the sliver compensates the title fluctuation. The sliver at the outlet of the drafting roller is thus constant. The speed of the sliver at this point is variable, so it is necessary to control equally the speed of the coiler.

The coiler is driven by an electric motor, the speed of which is controlled by the R.R.C. Between the R.R.C. and the coiler, the sliver runs into a PVC trumpet and makes a loop. The length of the loop turns the position of the trumpet which controls the speed of the coiler. When the trumpet goes down, the speed of the coiler is increased, and if the trumpet goes up, the speed of the coiler is decreased.

There are several adjustments to be made in relation to the quality of the cotton:

  •   1.-  The drafting space is adjusted according to the length of the fibre
  •   2.-  The draft between the card and the R.R.C. is generally of between 1.1 and 1.2.
  •   3.-  The main draft between the input rollers and the output rollers of the R.R.C. and the delay of the electronic system.

On leaving the Works, the R.R.C. is adjusted to work with an input sliver title which is about 5 gr. per metre. The output title depends only on the main draft, given at the sliver, which can be settled on the front panel.

There are safety devices which stop the motion of the card when there are faults in the regulator:

  •   1.-  When the title of the input sliver becomes too low, i.e. lower than the title of the output sliver.
  •   2.-  When the sliver is cut between the R.R.C. and the coiler.
  •   3.-  When the current into the drafting motor becomes too high.

Mechanical Description of the regulator


The installation is composed of 3 main parts:

  1. the drafting system
  2. the electronic computer
  3. the coiler motor

Drafting system


A pair of tongued and grooved rollers (l).

The lower roller is driven directly by the card ; the upper roller is connected by mechanical multiplication to a transducer (5).

The speed of these rollers is measured by the tachometer (6).

These rollers (1) consist both in feeding the rollers of the drafting system and in elemenis of measure of the title of the sliver.

A pair of drafting rollers (2).

The lower roller is driven by a special motor which speed is controlled by the electronic computer. The speed is measured by the tachometer (7).

The upper roller can be disengaged thanks to the handle al the top of the drafting system. At the output of the drafting rollers, the sliver runs into a trumpet which is called loop control. This trumpet has an oscillating motion an its weight is perfectly compensated by a spring, in order to avoid any faulty between the R.R.C. and the coiler.

Function principle


On the front panel of the loop control there is a switch with 3 positions:

  •   Stop: In this position the driving motor of the draft system is blocked up.
  •   Start: This position is only used to start the card; the safety device which stops the card when the input title is too low and when the trumpet is down, is eliminated.
  •   Run: This is the normal position when the card runs; all safety devices are in use.

Two pilot lamps which indicate in which position the loop control is placed.

  •   STOP position only the RED lamp is lighted.
  •   START position RED + GREEN lamp are lighted.
  •   RUN position GREEN lamp is lighted.

Inside the DRAFTHEAD there is a screw to adjust the zero position of the transducer N° 5. This adjustment will only be used when the input tátle is over 6 gr. per metre, or below 5 gr. per metre. At this moment, the user must cali for an official technician to re calibrate the R.R.C.

Electronic Computer


It Controls the speed of the drafting motor and the motor driving the coiler.

The electronic Computer receives its information from:

  •   - the transducer N°5
  •   - both tachometers 6 and 7
  •   - the loop control N°8
  •   - the tachometer on the driving motor N°4

On the front panel is a meter which indicates either:

  •   SPEED IN: the input speed in metre/sec. of the sliver or web measured by tachometer N°6.
  •   SPEED OUT: the output speed in metre/sec. of the regulated sliver, measured by tachometer N°7
  •   INPUT DENSITY: the instantaneous title of the input sliver or web

There are also 4 other switches:

  •   DRAFT: is used to adjust the main draft
  •   FINE: is the fine draft adjustment
  •   DRIFT and SLIP: only used to compénsate mechanical and electrical drifts

All active circuits are located on the plugging printed boards.

A complete description of these printed boards is given below.

There are also several adjustments on these printed boards, but only one must be adjusted by the user to adjust the position of the output trumpet N°8. This adjustment is located on the printed board 8 and is not sealed.

Location for Printed board N°2 and N°9 are free.

All force elements are located at the rear of the Computer box on a cooler, in order to avoid heating inside the box.

COILER MOTOR


This unit is directly fixed on the coiler and Controls its speed. The motor is a conventional 3-phase ASYNCHRONE - 1,5 H.P. 220 V AC.

This motor is connected to the frequency inverter, located inside of the Computer box. These work at a frequency in such a way that it adjust the speed of the coiler in a proper manner.

The electric cables ending by a special plug, it is impossible to mix them up.

Printed boards located in the electronic box are numbered from 1 to 10. N°1 IS AT THE RIGHT SIDE AND N°10 AT THE LEFT SIDE.

**ATTENTION**


ONLY PUT THE MAIN VOLTAGE 220 VOLTS AC TO THE RRC TEXCONTROL UNIT WHEN PRINTED BOARDS , DEVICES AND ELECTRIC CABLES ARE AT 100% CONNECTED OTHERWISE DAMAGES MAY BE CAUSED.

Trivax (Autotronic)

We use the Autotronic technique.