weaving technology Mechanisms of flat Valeriy V. Choogin, The Textile Institute Palitha Bandara and Elena V. Chepelyuk PUBLISHING

Transcription

1 Woodhead Publishing Series in Textiles: Number 144 Mechanisms of flat weaving technology Valeriy V. Choogin, and Elena V. Chepelyuk Palitha Bandara The Textile Institute WP WOODHEAD PUBLISHING Oxford Cambridge Philadelphia New Delhi

2 Contents Woodhead Publishing Series in Textiles Preface Note for students using this book ix xv xix 1 Introduction: classification and mechanisms of weaving machines Introduction Classification of weaving machines Basic mechanisms of the weaving machine Elastic system of fabric formation (ESFF) Advantages and disadvantages of different weaving machines Questions for self-assessment References 16 2 Mechanisms of the weaving machine for warp release and warp tension control Introduction: mechanisms of the weaving machine for warp release and warp tension control Warp brakes Warp regulators Condition of the equilibrium of the mechanism of a moving back-rest Stabilization of the mode of release and the tensioning of warp threads Comparative analysis of brakes and regulators Questions for self-assessment References 39 3 Warp shedding in weaving: parameters and devices Introduction: parameters of the shed Elongation of warp threads in shedding 44 v Woodhead Publishing Limited, 2013

3 vi Contents 3.3 The classification of shedding devices Tappet shedding Dobbies The Jacquard machine Comparative analysis of shedding devices Questions for self-assessment References 63 4 The supply of weft on the weaving machine Introduction: the supply of weft on the weaving machine Gauges for detecting the presence of weft on shuttle weaving machines Battery type weft supply Mechanisms for changing pirns Safety devices of automatic pirn change Change of hollow pirns Change of shuttles Multishuttle mechanisms Weft supply on shuttleless weaving machines Devices for measuring and control of weft tension Questions for self-assessment References 82 5 Weft insertion Introduction: methods of weft insertion Continuous insertion of weft by shuttle Weft insertion by microshuttle Weft insertion by projectile Weft insertion by rapiers Weft insertion by air and water jets Pneumatic-rapier weft insertion Weft insertion by an electromagnetic drive Weft insertion by the inertial method Comparative analysis of different methods of weft insertion Questions for self-assessment References Woven fabric formation: principles and methods Introduction: woven fabric formation Fabric-forming mechanisms Formation of the woven fabric cell Parameters of woven fabric formation 116

4 Contents vii 6.5 Ring temples Methods of easing of fabric formation Comparative analysis of the methods of fabric forming Questions for self-assessment References Mechanisms for woven fabric take-up Introduction: mechanisms for woven fabric take-up Winding woven fabric on the cloth beam Comparative analysis of methods of woven fabric take-up Questions for self-assessment References Safety devices on weaving machines Introduction: safety devices on weaving machines Weft controllers Devices for prevention of warp thread breakage Comparative analysis of safety devices Questions for self-assessment References Weaving machine drives: mechanisms and types Introduction: the weaving machine drive Mechanisms for driving the main shaft of a weaving machine Weaving machine brakes Combined start-up and braking mechanisms Comparative analysis 9.6 Questions for self-assessment 150 of different loom drives References Weaving machine parameters for specific woven fabric structures Introduction: the normalization process for weaving operations Estimating drawing-in parameters for a weaving machine Setting up parameters for the machine-yarn-fabric path (MYFP) on weaving machines Verification of parameters for the elastic system of fabric formation (ESFF) and machine-yarn-fabric path (MYFP) on weaving machines Evaluating warp thread tension by oscillogram analysis 157

5 viii Contents 10.6 Coordination of weaving cycles Factors affecting the productivity of weaving machines Comparing operating conditions for natural and synthetic fibres Questions for self-assessment References Control of woven fabric quality: defects and quality assurance of grey fabrics Introduction: the quality control of woven fabric Defects in grey fabric Quality assurance of grey fabric Equipment for the control of woven fabric quality Questions for self-assessment References Movement of raw materials and finished fabrics in weaving manufacture Introduction: product transportation in weaving manufacture Transportation of raw materials and outputs Questions for self-assessment References 181 Appendix 1: Further reading on weaving technology 183 Appendix 2: Glossary of terms applied to weaving machines and weaving technology 185 Index 205 Woodhead Publishing Limited, 2013