Textile Mechanisms in Spinning and Weaving Machines

The book has been written in response to numerous suggestions and great interest of colleagues and students in the textile industry to note the various design aspects in the mechanics of the textile machineries.

Preface Foreword Belt, rope and chain drives Introduction Selection of belt drive Types of belt drives Types of belts Flat belt drives Velocity ratio of belt drive Power transmitted by a belt Ratio of driving tensions for flat belt drive Centrifugal tension Initial tension in the belt V-belt drive Rope drive Chain drives Gear trains Introduction Nomenclature of gears Rotary motion Introduction Linear displacement Angular displacement Speed Transmission of rotary movement in machines Classification of gears Gears in textile machines Equations of movement Acceleration Retardation Parallelogram of velocities Introduction Velocity Force, mass and momentum Introduction Definitions and units Units of force Momentum in quantity of motion Work and power Introduction Units of work (in SI units) Graphical representation of work Useful definitions Work done by a varying force Resolution of forces Introduction Lines of representation of forces Law of Polygon of forces Law of Triangle of Forces Tension and compression Graphical methods Resolution and composition of a force Resolution of a number of coplanar forces Centre of gravity Introduction Centre of gravity of irregular bodies Centre of gravity of levers Principle of moments Moment of force Geometrical representation of moments Types of moments Clockwise moments Anti-clockwise moments Varignon’s Principle of Moments or Law of Moments Moments on bent lever Moments of bent lever in weighting arrangement Bent lever in weighting of single yarns Bent lever on Lea strength tester Friction Introduction Types of friction Limiting friction Coefficient of friction (Fig. 11.2) Laws of solid friction Friction of shaft in its bearings Friction clutches Power transmission Coil friction Introduction Friction on curved surface Coefficient of friction on solid surface Transmission of power by belts and rope drives Transmission of power by V-belts and rope drives Brakes Lifting machines and velocity ratio Introduction Definitions Velocity ratio Velocity ratio on simple pulleys Weston differential pulley block Types of machines Law of a machine Stress, strain and elasticity Stress Energy Momentum energy impulsive forces and impact Momentum Law of Conservation of Momentum Collision of two bodies Collision of inelastic bodies Collision of elastic bodies Coefficient of Restitution (e) Impulse Energy Potential energy Kinetic energy Strain energy Law of Conservation of Energy Motion in a circle Introduction Centripetal force Centrifugal force Conical pendulum Tension in rotating masses Simple harmonic motion Introduction Definitions of few terms Simple pendulum Helical springs Moments of inertia and kinetic energy of rotating bodies Mass moment of inertia Fundamental equation for a rotating body Kinetic energy of a rotating body Compound pendulum Centre of percussion Practical methods of finding moment of inertia Introduction Flywheel Methods of finding Moment of Inertia of fly wheels Bifilar suspension Referring Moment of Inertia Moment of inertia referred to its driving shaft Winding mechanics Cams Introduction Classification of cams Classification of followers Cams in textile machines Construction of the cam design Terms in Cam profile Scutcher feed regulating mechanism (Fig. 20.15) Cone drum construction (Fig. 20.16) Design of cone drum profile (Fig. 20.17) Design of cone drums in speed frame (Fig. 20.18) Tappets Construction of shedding tappet Determination of tappet lift Determination of NPC and FPC Relation between dwell period and type of heald movement Tappet design for plain weave Design of tappet for twill weave Construction of a shedding tappet for three-shaft weave Cranks and eccentrics