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KINEMATICS OF SINGLE NEEDLE LOCK STITCH MACHINES

KINEMATICS OF SINGLE NEEDLE LOCK STITCH MACHINES. INTRODUCTION. GENERAL ASSEMBLY. OUTER PARTS OF SNLS. Inner parts of a machine. MECHANISMS OUTLINE. NEEDLE BAR THREAD TAKE UP LEVER POWER TRANSMISSION *GEARS/BELTS *UPPER LOWER SHAFTS FEED DOG BACK TACK LEVER STITCH LENGTH KNEE LIFTER.

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KINEMATICS OF SINGLE NEEDLE LOCK STITCH MACHINES

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  1. KINEMATICS OF SINGLE NEEDLE LOCK STITCH MACHINES

  2. INTRODUCTION GENERAL ASSEMBLY OUTER PARTS OF SNLS

  3. Inner parts of a machine

  4. MECHANISMS OUTLINE • NEEDLE BAR • THREAD TAKE UP LEVER • POWER TRANSMISSION*GEARS/BELTS*UPPER LOWER SHAFTS • FEED DOG • BACK TACK LEVER • STITCH LENGTH • KNEE LIFTER

  5. NEEDLE BAR MECHANISM • NEEDLE BAR MOVEMENT FOLLOWS A CRANK SHAFT MECHANISM • ROTATORY MOTION OF THE MAIN SHAFTVERTICAL MOTION OF NEEDLE BAR

  6. THREAD TAKE-UP LEVER • TO FECILITATE LOOP FORMATION BY LOOSENING THREAD TENSION • TO TIGHTEN THE LOOP ONCE FORMED

  7. PRESSER BAR AND PRESSER FOOT

  8. POWER TRANSMISSION, SHAFTS • ONE MAIN SHAFT • CONNECTING MECHANISMS (GEARS,CAMS,LEVERS etc.) • THREE LOWER SHAFTS

  9. FEED DOG MECHANISM • ECCENTRIC MECHANISM

  10. BACK TACK LEVER • RESETS THE STARTING POINT OF ELLIPTICAL MOTION, SHIFTING IT TO THE OPPOSITE DIRECTION

  11. STITCH LENGTH VARIATION • REGULATOR KNOB ATTACHED TO VERTICAL SHAFT ATTACHED TO STITCH SETTING FEED DOG SHAFT • INTERLOCKS IN GROOVES, CHANGING THE ANGLE OF THE SHAFT, THEREBY CAUSING VARIED ELLEPTICAL MOTION

  12. KNEE LIFTER • LIFTS UP THE PRESSER BAR EHEN FREQUENT ADJUSTMENT OF FABRIC IS REQUIRED WITH THE HELP OF TORSIONAL SPRING

  13. STITCH FORMATION • SYNCHRONIZED MOVEMENT OF NEEDLE AND BOBBIN CASE ASSEMBLY

  14. MISCELLANEOUS • STITCHING ASSEMBLY COMPONENTS • THREAD TENSION DISCS • LUBRICATION SYSTEMS

  15. SNLS:CURRENT ADVANCEMENTS Every machine manufacturer now tries to offer flexibility of operations. • Easily switchable needle bar stroke from Yamato.Needle bar stroke is switchable from 31mm to 33mm—ensures

  16. New looper thread take-up cam system from Yamato • Exchange of CAM can also be done to meet various sewing conditions

  17. Re-shaped machine arms in lockstitch machine from Juki—ensures easy space around needle entry point.

  18. PDA and Laptops can be connected to SNLS—any stitch pattern drawn can be produced directly by the machine.

  19. Self cleaning or Lint collector system—incorporated by Yamato, Pegasus, Kansai.

  20. Interchangeable drop feed and needle feed system in Juki LH-3126F through replacement of the gauge.

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