Weft yarn scissor device used for rapier loom

Abstract

Provided is a weft yarn scissor device used for a rapier loom. The device comprises a support base, a movable blade driving mechanism, a fixed blade fixing seat, a movable blade pivoting support mechanism, a movable blade, a fixed blade and a yarn-blocking piece. The device is characterized in that the support base is equipped with an air cylinder fixing board support; a fixing arm of the fixed blade fixing seat extends rightwards in the back direction at the right end of the support; a scissors chamber is formed in an area ahead corresponding to the fixing arm of the fixed blade fixing seat;the movable blade driving mechanism comprises an air cylinder fixing board, an air cylinder, a driving spring and a connecting rod; the left end of the air cylinder fixing board and the air cylinder fixing board support are fixed; the right end of the air cylinder fixing board corresponds to the position above the scissors chamber; the air cylinder is fixed at the right end of the air cylinder fixing board; the driving spring is arranged on an air cylinder column in a sleeving manner; the left end of the connecting rod is connected with the air cylinder column; the movable blade pivoting support mechanism is connected with the right end of the connecting rod; and the fixed blade fixing seat and the fixing arm of the fixed blade fixing seat are fixed. The device has the following beneficialeffects: the structure is simplified; the device is high in response speed; adaptability of fabric variety is improved; and cutting requirements for different thicknesses or different materials of weft yarns are met.

Description

technical field [0001] The invention belongs to the technical field of looms, and in particular relates to a weft yarn scissors device for a rapier loom. Background technique [0002] The aforementioned weft yarn scissors device is customarily called "weft shearing device", and based on this, the weft yarn scissors are called "weft shears". The rapier loom is a shuttleless loom that uses a reciprocating sword-like rod (ie rapier) to fork or clamp the weft yarn and introduce the weft yarn into the fell. Because the rapier loom is characterized by weft supply outside the machine, the weft yarn is actively controlled by the rapier head, and the weft insertion quality is high, and because the rapier loom has a fast weaving speed, a high degree of automation, and a positive weft insertion method, it has a strong adaptability to the variety. It can meet the weft insertion requirements of various yarns, and it also has obvious advantages in multi-color weaving that other looms can...

AI Technical Summary

Problems solved by technology

The weft yarn scissors device used in the rapier loom in the prior art is to cut the weft yarn by the reciprocating motion of the upper and lower blades in the form of mechanical drive. The mechanically driven weft yarn scissors device can only be adapted to cut the yarn material, Weft yarns with relatively small difference in number and complex adjustment, especially if weaving weft yarns with large differences in yarn material and yarn count at the same time, then it is necessary to set the cutting time of different weft yarns, and generally use a servo motor to drive the weft yarn scissors

Typical examples of servo motor-driven weft scissors such as the "electronic weft scissor mechanism for rapier looms" recommended by Chinese patent CN204982245U and the "rotary weft shearing device for looms" provided by CN207619605U, etc., are not limited to examples. The cited patent uses a servo motor, so the cost is relatively high and the control is very complicated

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