Active driving mechanism for moving rear beam of rapier loom

Abstract

An active driving mechanism for a moving rear beam of a rapier loom comprises a fixed rear beam, a moving rear beam and a warp. The fixed rear beam is hinged to a fulcrum M on a frame through a bearing. The moving rear beam is hinged to a fulcrum S on a rear beam rocker through a bearing. The warp unwound from a warp beam passes by the fixed rear beam and the moving rear beam, reaches an opening rear prior to being divided into an upper warp layer and a lower warp layer, and reaches a cloth fell. The rear beam rocker is hinged to a transitional rocker through a first connecting bar, the transitional rocker is hinged to an eccentric wheel through a second connecting bar, and the eccentric wheel, the second connecting bar, the transitional rocker and the frame form a four-bar mechanism. The eccentric wheel is fixedly and coaxially connected with a rear beam pulley, the rear beam pulley is connected with a weft finding pulley through a synchronous belt, and the weft finding pulley is connected with a spindle through a weft finding clutch. The active driving mechanism can be used for a loom with a weft finding function, the rear beam swings with opening of the loom constantly, and accordingly change of warp tension cause by opening can be compensated effectively. Adjustment of compensation of the rear beam is convenient and accurate.

Description

technical field [0001] The invention relates to a positive drive mechanism for a movable back beam of a rapier loom, which belongs to weaving equipment and weaving technology in the field of textile machinery. Background technique [0002] The movable backrest of the loom plays the role of making up for the tension change caused by the opening of the warp yarn. In the rapier loom, the swing of the movable backrest is generally passively controlled by the spring. changes, an existing structure see figure 1 As shown, the warp yarns coming out from the warp shaft arrive at the opening area through the fixed backrest 101 and the movable backrest 102, and are divided into upper and lower layers of warp yarns, and then arrive at the weaving fell position. The fixed rear beam 101 is hinged with the frame through bearings, and can rotate around the fixed rotation center M. The movable back rest 102 is hinged on the back rest swing arm 103 through a bearing, and then the beam s...

AI Technical Summary

Problems solved by technology

[0008] The disadvantages of the above structure are: the loom with weft-seeking function, when weft-seeking, the opening mechanism moves, but the main shaft does not move; figure 2 In the mechanism shown, the swing action of the movable back beam is directly driven by the main shaft, which cannot satisfy the driving of the back beam during weft-seeking, and cannot compensate the change of warp tension caused by the shedding movement. This mechanism can only be used for non-weft-seeking Functional looms, and generally high-grade rapiers need to have weft-seeking functions

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