The function of the rapier head and the conditions it should meet

The function of the rapier head and the conditions it should meet

The rapier loom weaves through the weft insertion of the rapier head and rapier belt. The rapier head and rapier belt are the core components of the rapier loom. This chapter introduces the rapier head, and the next chapter introduces the rapier strap.
1. The function of the rapier head
The rapier head is a main device for completing the weft insertion in the rapier loom. It consists of two parts: the weft sending sword and the weft receiving sword. They are installed on the two swords respectively. The top of the belt, through the sword belt driving device, reciprocates in the sword walking board (guide rail).
The weft-feeding sword clamps the weft yarn sent from the weft-selecting finger from the left side of the loom, and introduces it into the center of the shed of the loom. The weft-feeding sword moves from the right side of the loom to the center of the loom and sends the weft-feeding sword. The weft yarn is hooked and returned to the selvedge on the right side of the shed. The weft-feeding sword also returns to the left side of the shed at the same time. The weft-feeding and receiving sword completes a cycle of weft insertion tasks, and the reed begins to beat up.
2. Conditions that the rapier head should meet in terms of weaving technology
(1) Appearance of the rapier head.
① The surface of the sword head should be completely smooth, without waste edges, burrs, cracks, depressions and bubbles, and there should be no weft breaks.
② The warp yarn contact surface should be smoothly connected, and the yarn passing surface should not have any defects that may lead to yarn breakage.
(2) The weft-feeding sword must work stably and reliably. The crimping plate must be well matched with the contact surface on the left housing. The height of the head of the crimping plate must ensure that various weft yarns are accurately included in the jaws and can be clamped reliably. The weft yarn should not be detached or broken.
(3) The meshing working surface of the weft connecting sword yarn clamping rod and the yarn hooking head should be completely smooth without burrs, the fit should not be perfect, and the opening should be sensitive to ensure reliable weft yarn clamping.
(4) The gap size between the weft sword guide yarn count support arm and the hook yarn metal head should be determined according to the thickness of the spinning yarn. It is generally controlled at 0.3~1.2mm to ensure that each spinning yarn can be spun smoothly. Enter.
(5) The weight of the rapier head should, in principle, be determined during the overall structural design of each type of rapier loom. The weights of several commonly used rapier heads are shown in Table 13-1 for reference.

(6) The sword head should have good wear resistance, long service life, completely reduce the user’s machine material consumption, the selection of its materials, the accuracy of the finishing process and the heat treatment and surface treatment process Adjustment is crucial to the service life of the sword head.

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