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Question

In a flat bed knitting machine, the loop length is controlled by

The correct answer is
Stitch cam

Flatbed Knitting: Loop Length Control Mechanism

The control of loop length is crucial for determining the fabric's density and appearance in knitting. On a flatbed knitting machine, this specific function is managed by the stitch cam.

Stitch Cam Function

  • The stitch cam directly influences the amount of yarn taken by the needle.
  • Its position determines the depth to which the needle is drawn downwards after clearing the old loop. This action dictates how much yarn is available to form the new loop.
  • Adjusting the stitch cam allows for variations in loop size, enabling control over fabric tightness and gauge. Higher settings generally produce shorter loops and denser fabric, while lower settings create longer loops and looser fabric.

Other Cam Functions

  • Raising Cam: Primarily responsible for lifting the needles to the correct height for yarn insertion.
  • Clearing Cam: Works to close the needle latch after the needle has passed through the old loop, preparing it for the new loop formation.
  • Guard Cam: Guides the needles within the needle track, ensuring proper alignment and movement.

Therefore, the stitch cam is the component directly responsible for regulating loop length.

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Important Questions from FABR Weft and Warp Knitting

  1. Amongst the following, the component which is NOT a part of single-bed warp knitting machine, is
  2. A circular weft knitting machine with 24 inch gauge and 20 inch diameter needle bed is used to make a tubular knitted fabric. If the fabric shrinks by 35 % in course-wise direction upon withdrawal from the machine, the circumference (inch) of the shrunk tubular fabric is approximately

  3. Fabric structure related to weft knitting is
  4. Group I gives a list of terms related to woven fabrics and Group II contains equivalent terms related to knitted fabrics. Match the term from Group I with the equivalent term from Group II.

    Group IGroup II
    P. Cover1. Interlock
    Q. Double-cloth2. Wales
    R. Warp3. Tightness
    S. Weft4. Courses

     

  5. The wale constant and course constant are 4.2 and 5.04 respectively. If the loop length is 4.2 mm, then stitch density (number/cm$^2$) is______.

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