Side Sweep Mechanical Feeler

The feeler blade makes contact with yarn on the pirn when the loom is nearing its most forward position by penetrating holes in the shuttle box front and the shuttle wall. It will be pushed in the direction of arrow A (figure a), because the serrations in the tip of the blade will be embedded in the yarn. As the slay recedes the blade will be returned to its original position by the spring. When yarn is being withdrawn from the bunch the feeler blade will slide to the right as indicated by the arrow B on the smooth polished surface of the pirn as the sley is at the forward position. This will cause the connecting road to punch the bell-crank lever whose upper arm will then raise the tip lever. The tripper heel, which is attached to and therefore oscillates with the weft fork hammer, will now push the lower arm of the trip lever and thus cause a sufficient rotation of the change shaft which therefore activate the changing mechanism. The feeler blade is returned to its normal position by its spring.