Side Sweep Mechanical Feeler

To check the presence or absence of yarn for weft insertion

Working Principle:

  1. Initial position: The side sweep mechanical feeler is initially in its normal position, with the feeler blade aligned in a certain direction.
  2. Contact with yarn on the pirn: As the loom approaches its most forward position, the feeler blade makes contact with the yarn on the pirn (a cylindrical bobbin). The serrations on the tip of the blade embedded in the yarn, causing the feeler blade to be pushed in the direction indicated by arrow A.
  3. Spring return: As the loom sley recedes, the feeler blade is returned to its original position by the spring. This allows the loom to continue its normal operation.
  4. Yarn withdrawal: When yarn is being withdrawn from the yarn bunch, the feeler blade slides to the right on the smooth, polished surface of the pirn. This movement is indicated by arrow B. The feeler blade glides along the surface of the pirn as the loom sley reaches its forward position.
  5. Activation of the changing mechanism: The movement of the feeler blade causes the connecting road to push the bell-crank lever. This action, in turn, raises the tip lever.
  6. Tripper heel action: The raised tip lever comes into contact with the tripper heel, which is attached to the weft fork hammer. The tripper heel pushes the lower arm of the trip lever, causing sufficient rotation of the change shaft.
  7. Changing mechanism activation: The rotation of the change shaft, triggered by the tripper heel, activates the changing mechanism. This mechanism facilitates the automatic shuttle change in the loom.
  8. Spring return of the feeler blade: After the activation of the changing mechanism, the feeler blade is returned to its normal position by its spring, preparing for the next cycle.

Advantages of the side sweep mechanical feeler

  1. Automatic operation: The side sweep mechanical feeler allows for automatic detection of the yarn position and initiation of the shuttle change process in the loom. This reduces the need for manual intervention and improves the overall efficiency of the weaving process.
  2. Precise yarn detection: The feeler blade, with its serrated tip and contact with the yarn, provides accurate and reliable detection of the yarn presence on the pirn. This ensures that the shuttle change mechanism is activated at the right time, preventing errors in the weaving process.
  3. Integration with other components: The side sweep mechanical feeler is designed to interact with other components, such as the bell-crank lever, tripper heel, and change shaft. This integration enables a coordinated and synchronized operation of the shuttle change mechanism, enhancing the overall performance of the loom.

Disadvantages of the side sweep mechanical feeler:

  1. Limited flexibility: The side sweep mechanical feeler is specifically designed for a particular loom setup and yarn handling system. It may not be easily adaptable to different loom configurations or alternative weaving processes. Modifying or reconfiguring the feeler for different applications may require significant adjustments or replacement.
  2. Mechanical wear and maintenance: As a mechanical component that comes into contact with yarn and operates through physical contact, the feeler blade may experience wear over time. Regular maintenance, such as cleaning, lubrication, and potential replacement of worn parts, may be necessary to ensure its reliable operation.
  3. Complexity and cost: The integration of the side sweep mechanical feeler with the other components of the shuttle change mechanism can add complexity to the overall system. This complexity may increase the initial setup and maintenance costs of the loom.
  4. Sensitivity to yarn characteristics: The effectiveness of the feeler blade in detecting the yarn position may depend on the specific characteristics of the yarn being used. Variations in yarn thickness, texture, or other properties can affect the performance and reliability of the feeler in accurately detecting the yarn presence.

It’s important to note that this description assumes a specific mechanism and arrangement in the loom, and variations may exist in different loom designs. The purpose of the side sweep mechanical feeler in this context is to detect the position of the yarn and initiate the automatic shuttle change process in the loom.

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