In the delivery of the card a pair of disc rollers scan the cross-section of the carded sliver as it emerges. These readings are compared electronically with the . Need of Autoleveller in. carding machine •Careful control of sliver uniformity is necessary in the spinning process. •So, continuous checking of sliver weight. Keywords: Autoleveller, Cotton yarn, Count variation, Draw frame. 1 Introduction able yarn count CV has been assessed for carded counts. The effect of single.
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Careful control of sliver uniformity is necessary in the spinning process, to minimise the production of streaky fabrics. So, continuous checking of sliver weight together with automatic correction of sliver weight variation at card is necessary.
The irregularity of card feed material is the important reason for sliver count variation ranging from very short upto 25 cm to very long term more than m variations. Based on high spinning draft, even short term sliver irregularity leads to quite distinct count variation in yarn. Sliver passes between front draft controlling roller first, then passes between tongue and groove roller. Sliver variation cause the tongue upper roll to rise or fall.
These very small movements of the tongue roll or the variations in mass per unit length of card sliver are amplified 20 fold and transmitted to an infinitely variable speed gear box. The out put shaft of the same drive the front draft controlling roller, calender roller, and coiler roller at variable speed so as to adjust the draft in accordance with the sliver thickness measurement.
This system reduce long-term and short term variation. Deviations from the nominal count are processed by electronics into correction commands, which are executed at the card in take via the feed roll.
Of the two sensing roller, one is movable under spring pressure. The distance between centre of two rollers varies with the fluctuating sliver thickness. The amount of this lift is measured and converted into a voltage proportional to the sliver thickness.
Prom this measured autolevepler a set point speed is derived for the variable speed motor which drive the draft roll.
Auto Leveling in Carding | Part 04
If the actual speed differs from the set point, the variable speed motor is de-accelerated or accelerated untill the two speeds coinside i. To stop the doffer when sliver is missing or sliver is too thin or too thick or when the lap-up choking on coiler calender Roller.
As the calender roll move, the aluminium disc is lifted and comes in contact with adjustable pins, it operate the corresponding electro pneumatic valve on or off the doffer driving mechanism. The sliver delivered from the calender roller passes beneath a guide located at the end of a lever. This lever drops when the sliver or the web breaks and, stop the card by the czrding of the mechanism. A photo cell monitors the sliver between the calender rollers and the coiler.
The optical feeler is so arranged that the running sliver interrupts the beam of light and if the sliver breaks. At both ends of the feed roller, microswitch is provided. During the entry of abonormal thickness of lap or metal pieces under the feed roll, the knob raises. When the knob raises by 1 mm the limit switch will act in such a way that the machine stop, and the white lamp burns, giving a signal to the operators.
Auto leveler autoleveller in carding How it works? Graf ‘Optima” card auto leveller: Stop motions in the carding Stop motions are used in the following places of HP cards.
Sliver break stop motion: Coiler hood stop motion: A limit switch is provided to prevent the starting of doffer when the coiler hood is opened. Optical feeler in the coiler unit: Peed Roller Stop Motion.
Autoleveller in Carding | Autoleveller in Drawframe – Textile Centre
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