Recent developments in speed frame
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The presentation by Harsh Kumar discusses advancements in the building motion mechanism of the speed frame in textile technology, addressing issues with traditional builder motion and highlighting three key developments. These include replacing ratchet wheels with eccentric cams, using ball bearings instead of bush bearings for better load support, and transitioning from spur gears to helical gears for improved torque capacity. Modern systems now utilize individual servo motors for enhanced precision and reduced maintenance, integrating advanced control systems to optimize the speed and motion parameters of the machinery.
Recent developments in speed frame
- 1. Presentation Made By Harsh Kumar(19110032) Submittted To : Dr. N Bhowmick Department of Textile Technology Recent Developments in SpeedFrame
- 2. • Builder Motion. • Problems in Conventional Builder Motion. • Development – 1 • Development - 2 • Development - 3 • Latest &Advanced Development…
- 3. Builder Motion The Building mechanism of Speed frame is very complicated in the view of its mechanical drive system. So That is Why There was a big demand of development in building motion. Since Builder Motion has to perform so many task: • Reduction in RPM of Bobbin (Through Shifting of Belt) • Up-Down Movement of the bobbin Rail • Shortening of the traverse length to make ends taper
- 4. • Long Gear Train Creating noise.. • If one gear is faulty then it lead to change the parameters (Draft, Bobbin RPM etc.) by a great extent. That is not desirable. • Initially Shifting of the belt was done by Ratchet Wheel which does not produce the required linear variation in bobbin rotation speed. • Spur gears are frequently damaged.(few teeth get smashed)
- 5. developMents -1 Since To design Hyperbolic cones is difficult. So Ratchet and Hyperbolic cones are replaced by Eccentric cam and straight sided cones.. Now to achieve Linear variation in bobbin speed eccentric cams are used with straight sided cones.
- 6. developMents -2 Ball bearings can spin in any direction due to their spherical shape. They can support combined loads—loads from above (radial loads), as well as side-to-side forces (axial loads). Ball bearings minimize rotational friction as the races that contain the balls work to transmit the loads Bush Bearings are replaced by ball bearing.. Bush Bearing Ball Bearing
- 7. developMents -3 Advantage of helical gears over spur gears is in torque capacity. Spur gears, by design, are weaker than helical gears because loads are transmitted over fewer teeth. Helical gearing is machined with angled teeth, then hardened and ground, which is complex but necessary to achieve a high-efficiency gear mesh. Spur gears are replaced by Helical Gears… Spur Gear Helical Gear
- 8. developMents -5 In new speed frame machines Gear train is replaced by Timing belt GearTrain Timing belt Timing belt has many advantages over a Gear Train such as Less noise, reduces maintenance cost, Less space, minimum energy…
- 9. Developments in Building Motion Conventional Drive System Modern Drive System Differential Gear Drive Electronic Servo Motor Drive
- 10. individual Motor drive In conventional building mechanism source motion was a single motor. All the speed variations made from this motor RPM. But in Modern scenario Individual Motor driving system is used. In which drafting rollers, flyers, bobbins and bobbin rail are driven directly by individual servomotors and are synchronized throughout package build by the control system The advantages of this system are • no need of heavy counter weight for bobbin rail balancing • differential gear, • reduced maintenance, • lower energy consumption • Accuracy in motion transfer is great.
- 11. All machine manufacturers incorporate four-motor-drive system
- 12. • Technological parameters like length of roving in first layer, taper angle, no of layers, count, type fibers- are fed to the control panel. • Bobbin speed and Bobbin rail position are sensed by electronic sensors. • Tapering, rail movement etc. are controlled by Computer. • Operator is lead by operating menus and has all important information all the time • Adjustments can be stored, and transferred to other machines.
- 13. REFERENCES 1: W KleinVolume 3 (Spinning Preperation) 2: NPTEL 3: NCUTE publications onYarn Manufacturing, Indian Institute of Technology, Delhi THANKS……