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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Principle of short term auto leveling: Production and waste control in Carding Machine Carding Maintenance program Fibre hooks in carding and their effects on yarn q This is the most commonly used principle of card auto leveling and serves to keep the sliver count constant. How Laps formed in Blowroom? 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.
In the spinning mill, the card is the effective start of the process, since the first intermediate product, the sliver, is produced here. Coiler kn stop motion: Graf ‘Optima” card auto leveller: But the modern carding machines have sensing cafding the feed rollers as well as at the delivery calender rollers.
What are the Special features of modern beater in A photo cell monitors the sliver between the calender rollers and the coiler.
Developments in carding section Auto leveler autoleveller in carding How it wo Latest posts by Md. Degumming of Silk March 14, Md. High Production card and conversion of conventiona How the Carding Machine Works? 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. Peed Roller Stop Motion.
Doffing System in carding machine How it works? In closed loop system, the delivered sliver is sensed for its linear density and correction is done by changing total draft. Dust extraction systems in Carding Developments in licker-in section of Carding Machi Your feedback is always appreciated. 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.
Different principles for auto leveling can be selected depending upon the quality requirements and the operating conditions in the individual mill. Frictional Properties March 14, Md.
Of the two sensing roller, one is movable under spring pressure. 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. At both ends of the feed roller, microswitch is provided.
If the actual speed differs from the set point, the variable speed motor is de-accelerated or accelerated untill the two speeds coinside i. Lap length measuring motion in Blowroom How it w Auttoleveller is a device which is present on Carding as well as Drawframe machine to correct the variation in linear density weight per unit length of delivered sliver.
Ginning — Different Types Of Ginning machine. 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.
Deviations from the nominal count are processed by electronics into correction commands, which are executed at the card in take via the feed roll. Autleveller mills are therefore forced to use auto leveling equipment under highly varying circumstances. In former Zellweger equipment a medium-term auto leveler was provided as an addition to the long-term auto leveler. There are following advantages offered by an autoleveller system: Deviations in the set value are corrected electronically by altering the speed of the feed roller in the card.
This lever drops when the sliver or the web breaks and, stop the card by the operation of the mechanism. Sliver break stop motion: Settings in carding for different grades of cotton The measuring device is built into the protective cover above the doffer.
The sliver delivered from the calender roller passes beneath a guide located at the end of a lever. ERM- Cleaner -Universal opening and cleaning machi Prom this measured value a set point speed is derived for the variable speed motor which drive the draft roll.
The device measures reflection of infrared light from the fibers. 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. Study of different parts of carding machine and th Short staple spinning – 1.
Closed loop autolevellers are mainly used on carding machine. On the other hand, closed-loop control is not suited for regulating short-wave variation because of the dead time inherent in the system.
An optical measuring device detects relative variations in the cross-section of the fiber layer on the main cylinder over the whole width of the cylinder.
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. Feel free to join the discussion by leaving comments.