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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Fibre properties to be considered for blending: Optical feeler in the coiler unit: Principle of short term auto leveling: If the measuring point is located downstream from the drafting arrangement, or if cafding delivery roller pair itself provides the measuring point, then the system is operating on the closed-loop control principle.
Feel free to join the discussion by leaving comments. Proper selection and positioning of machines in bl Study of different parts of carding machine and th This system reduce long-term and short term variation.
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. 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. Developments in carding section Auto leveler autoleveller in carding How it wo Long-term auto leveling is an integral part of modern cards, and in any case used in production of autpleveller yarns and in the rotor spinning mill.
Peed Roller Stop Motion. Prom this measured value a set point speed is derived for the variable speed motor which drive the draft roll.
Autoleveller in Carding | Autoleveller in Drawframe
Settings in autoelveller for different grades of cotton Autoleveller 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.
The optical feeler is so arranged that the running sliver interrupts the beam of light and if the sliver breaks. In the delivery of the card caring pair of disc rollers scans the cross-section of the carded sliver as it emerges. For various reasons, the card cannot always operate absolutely evenly, for example, owing to uneven material feed.
Development of Autoleveller and Domestic Blowing-carding Unit–《Cotton Textile Technology》年07期
But the modern carding machines have sensing at the feed rollers as well as at the delivery calender rollers. Grinding Roller For Carding machine How it works 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 main regulating position is the feed; adjusting the feed roller speed, usually performs auto leveling. Please do not spam. Deviations in the set value are corrected electronically by altering the speed of the feed roller in the card.
According to the basic principle of operation, autoleveller can be classified into two main groups: Blending bale opener or hopper bale breaker: Short staple spinning – autoleeveller.
There are two possible applications for assemblies of this type, namely in processing comber noil and where card sliver is fed directly to the xutoleveller spinning machine. High Production card and conversion of conventiona Sliver break stop motion: The device measures reflection of infrared light from the fibers.
During the entry of abonormal thickness of lap or metal pieces under the feed roll, the knob raises. Graf ‘Optima” card auto leveller: Different principles for auto leveling can be selected depending upon the quality requirements and autoleveler operating conditions in the individual mill.
Auto leveler autoleveller in carding How it works? Sliver passes between front draft controlling roller first, then passes between tongue and groove roller.
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. Comparision between mixing and blending in Blowroo Powered by Facebook Comments. The speed of the feed roller of the card is changed electronically so that these fluctuations in the cross-section are leveled out. What are the Special features of modern beater in 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 roll. 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 closed loop system, the delivered sliver is sensed for its linear density and correction is done by changing total draft.
In case of open loop system, as the delivered material is not sensed for its linear density to know whether the correction has made or not.
The distance between autolevel,er of two rollers varies with the fluctuating sliver thickness. On the other hand, closed-loop control is not suited for regulating short-wave variation because of the dead time inherent in the system. Your feedback is always appreciated. The amount of this lift is measured and converted into a voltage proportional to the sliver thickness.