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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Developments in carding section Auto leveler autoleveller in carding How it wo If the actual carving differs from the set point, the variable speed motor is de-accelerated or accelerated untill the two speeds coinside i.

Autoleveller in Carding | Autoleveller in Drawframe

Settings in carding for different grades of cotton So, continuous checking of sliver weight together with automatic correction of sliver weight variation at card is necessary.

How Laps formed in Blowroom?

This operates via a regulating drive to adjust the in feed speed of the card so that the depth of the fiber layer on the main cylinder is held constant. The sliver delivered from the calender roller passes beneath a guide located at the end of a lever.

Graf ‘Optima” card auto leveller: Close Loop Autoleveller Image by Rieter. Stop motions in the carding Stop motions are used in the following places of HP cards.

Deviations from the nominal count are processed by electronics into correction commands, which are executed at the card in take via the feed autolevelker.


In former Zellweger equipment a medium-term auto leveler was provided as an addition to the long-term auto leveler. 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.

Thread Numbering System March 14, Md. In the feed of the card the feed measuring device records the fluctuations in the cross-section of the batt feed.

A photo cell monitors the sliver between the calender rollers and the coiler. Coiler hood stop motion: Optical feeler in the coiler unit: 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. Autoleveller is a device which autolevellsr present on Carding as well as Drawframe machine to correct the caridng in linear density weight per unit length of delivered sliver.

Auto Leveling in Carding | Part 04

Frictional Properties March 14, Md. Omar Faruk see all.

The amount of this lift is measured and converted into a voltage proportional to the sliver thickness. Fibre properties to be considered for blending: High Production card and conversion of conventiona There are following advantages offered by an carring system: On the other hand, closed-loop control is not suited for regulating short-wave variation because of the dead time inherent in the system.

Ginning — Different Types Of Ginning machine.

Auto Leveling in Carding | Part 04 | Textile Study Center

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. The optical feeler is so arranged that the running sliver interrupts the beam of light and if the sliver breaks.


Comparision between mixing and blending in Blowroo Defects in Blow room and causes. 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. The measuring device is built into the protective cover above the doffer. What are the Special features of modern beater in Finally, the drive to the delivery can present problems, since in this system the delivery speed must be continually varied, and in very small ranges.

Development of Autoleveller and Domestic Blowing-carding Unit–《Cotton Textile Technology》年07期

At both ends of the feed roller, microswitch is provided. This lever drops when the sliver or the web breaks and, stop the card by the operation of the mechanism. The main regulating position is the feed; adjusting the feed roller speed, usually performs auto leveling.

The distance between centre of two rollers varies with the fluctuating sliver thickness. But the modern carding machines have sensing at the feed rollers as well as at the delivery calender rollers. Powered by Facebook Comments. Degumming of Silk March 14, Md.

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