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18 LINK 58 . 2 /2011 PRODUCT NEWS Tab. 1 The basic data of the J 20 at a glance. the drive frame and the end frame are 6 sections each with 20 spinning positions. 4 robots – 2 on each side – are in operation for the formation of yarn piecings, bobbin change and cleaning (Fig. 1). Construction of sections and the machine height are selected to allow 500 mm (20”) round cans with 1 070 or 1 200 mm can height to be placed in 2 rows under the machine. The large can size permits a long lifecycle and thereby reduces the number of can changes. As with the rotor spinning machine, the sliver to be spun is fed from the can bottom. This short, direct route from the can to the drafting arrangement Spinning speed Up to 450 m/min, independent of fiber type, yarn count and end use. Yarn count Ne 30 to Ne 50 Spinning units 120 individually driven spinning units, 60 units per side, gauge 260 mm Number of robots 4 robots, with piecer technology for invisible piecings Drive Individual drive per spinning and bobbin unit, separate machine sides for the simultaneous production of 2 different yarns Drafting arrangement 4-over-4 drafting arrangement with patented traversing Yarn clearer USTER Quantum Clearer 2, optical or capacitive, with or without foreign fiber detection Winding system Individually driven bobbin units for cylindrical bobbins up to 300 mm diameter Fig. 2 Ergonomic bobbin take-off on the J 20. practically eliminates the risk of faulty drafts. An enormously important aspect, as with Rieter air-jet spinning, fine sliver is used to ensure optimal drafts at high speeds. To keep the operator requirements and the costs as low as possible, an empty tube feeder is utilized in which 350 bobbins can be creeled. The empty tubes are automatically fed to the robot – just in time – as soon as a bobbin change takes place. The bobbin diameter can be up to 300 mm. The tube feeder has 2 separate bobbin chains and can therefore supply tubes of different colors for the left and right machine sides. This eliminates the risk of tubes being mixed up when 2 yarn qualities are being simultaneously produced. The J 20 air-jet spinning machine uses a winding system whereby 2 contra-rotating wings precisely guide the yarn. With this winding system, ribbon windings definitely belong to the past. The cross-angle can be freely set between 15° and 46°. It is possible to use standard bobbins or colored bobbins on the J 20. The winding system with continuously rotating wings offers the potential for future increases in production rates. Due to the increased spinning stability with the new duo drafting arrangement, the J 20 air-jet spinning machine can – in comparison with the J 10 – be extended by one section. With 120 spinning positions, the J 20 is therefore the longest air-jet spinning machine in the world. Machine construction for optimized production process Construction of the J 20 – as compared to the J 10 – has been further optimized. The centrally-driven ventilators, the entire electrics and electronics as well as the supply and disposal connections are integrated in the drive frame. The filter chambers for the waste from the spinning positions and from the robots are separated from each other and are also separate for the left and the right machine sides. The waste can therefore be individually sorted which guarantees purity of material type for further use. The bobbin delivery on the drive frame is set at an ergonomic height of 1.45 meters. This enables the
Fig. 3 The open duodrafting arrangement – suitable for all types of fiber. operator to optimally control the bobbin conveyor belt and the bobbins can be conveniently removed and placed on pallets (Fig. 2). At the other end of the J 20 – between the last section and the tube loader – there is a free space as the service area for the robot at the rear. Market-conform yarn and bobbin quality With the J 20, the bobbin tension can be set over the whole bobbin. This, together with the image interference device, guarantees a perfect bobbin building process. The J 20 machines are equipped with the latest yarn clearer USTER Quantum Clearer 2; in line with the customer’s requirements – with capacitive or optical sensor – with or without foreign fiber detection. All yarn clearer settings are entered on the J 20 touch screen. All disturbing yarn faults, neps, thick or thin places and optionally also foreign fibers, are detected and cleared – an essential prerequisite for the downtime-free further processing of the yarn in weaving or knitting plants and a high-quality and even fabric appearance. New duo-spinning unit The new spinning unit of the J 20 achieves a high yarn strength and low number of imperfections. The drafting arrangement of the duo-spinning unit can be precisely and reproducibly set. Controlled fi ber guiding leads to good yarn quality as well as to a low number of quality cuts and natural thread breakages. The operator involvement is significantly reduced. With the J 20 duo drafting arrangement the productivity – compared with that of the J 10 – can be increased by 5% and this with equal or improved yarn quality. With the duo-spinning unit, the field of application for the air-jet spinning machine has been successfully extended. The J 20 can process viscose, Modal and blends with cotton. Deposits of fiber-fly and dirt are prevented by an optimized suction on the duo-spinning unit. There are practically no fiber deposits due to the open duo-drafting arrangement (Fig. 3). Any fiber-fly is removed by the robot in passing. The findings of the technological development and practical experience with the J 10 have been incorporated into the development of the J 20. The LINK 58 . 2 /2011 PRODUCT NEWS duo-spinning unit has numerous exchangeable technology elements with which it is possible to process different fiber materials and fiber counts or to achieve different yarn properties. Automation with 4 robots A J 20 air-spinning machine with 120 spinning positions is equipped with 4 robots, 2 on each side of the machine. The robot has various tasks: It cleans the spinning position and automatically pieces the yarn after a thread break or a clearer cut. It changes full bobbins and threads up the empty tubes – so-called doffing. A fan on the robot cleans the spinning positions from fiber-fly in passing. The robot of the J 20 is based on the automation technology of the rotor spinning machine. The wellproven Rieter piecing technology with almost yarnlike piecings leads to a high yarn quality. The entire J 20 piecing process is electronically controlled, assisted by the yarn clearer, and settings can be made on the machine display panel. The step-by-step introduction of new fibers gives the piecing a yarn-like appearance. The spinning technology guarantees that all fibers of the yarn end are perfectly bound in the piecing process – contrary to conventional splicers (Fig. 5). The piecers thereby formed fulfill all requirements in downstream processing. The robot works with a high degree of dependability. If problems occur, a trouble shooting program is shown on the robot display so that faults can be remedied without an instruction manual. When one of the two robots is in the separate maintenance and service station, the other robot automatically operates over the entire machine side. Flexible, simple machine settings High production speeds mean that the lots to be spun are finished increasingly quickly. The faster a machine spins, the quicker it should be able to be set for new orders. The machine concept of the J 20 is therefore arranged so that both machine sides are optionally entirely independent of each other. This makes possible the production of 2 different articles, i.e. yarns at the same time and increases the production flexibility of the spinning plants. 2 bobbin transport belts and the separate conveyance of empty 19
Page 1 and 2: The customer magazine of Rieter Spu
Page 3 and 4: Fig. 1 "The Comfort of Competence"
Page 5 and 6: 1963 1963 1963 1967 1975 1979 1979
Page 7 and 8: 1983 ITMA 91 Hanover, Germany CIS -
Page 9 and 10: staple cotton, Ne 50 at 380 m/min -
Page 11 and 12: LINK 58 . 2 /2011 EVENTS 11
Page 13 and 14: What does the red armchair mean? Th
Page 15 and 16: Fig. 3 Shiv Kumar Sharma, President
Page 17: J 20 Air-Jet Spinning Machine - A n
Page 21 and 22: Ring Com4® ComfoRo® ComforJet® F
Page 23 and 24: SPIDERweb - spinning mill data at a
Page 25 and 26: The right draw frame to meet every
Page 27 and 28: Improved package build with anti-pa

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