Gas-drive three-position double-shed dobby shedding mechanism

Abstract

A provided gas-drive three-position double-shed dobby shedding mechanism comprises three-position cylinders, a shedding arm, a steel-rope clamping seat, a steel rope, a heald-lifting beam, a heald-cord hanging strip, a heald-lifting rope, a heddle and a heald-returning spring which are in successive connection; the lower end of the heald-returning spring is fixedly disposed on a rack; the heald-lifting beam is capable of sliding vertically in a guide groove of a guide frame of the mechanism; each three-position cylinder drives a sheet of the heald-lifting beam; each cylinder of the three-position cylinder is connected with a solenoid valve controlled by a valve driving unit through a gas pipe; and the solenoid valve is connected with a valve control unit. The mechanism disclosed by the invention helps to solve the problem that the loom space cannot be matched with heald-frame quantity. The quantity of the heald-lifting beam (equivalent to a heald frame) can be 89, three-position double sheds can be realized through the heddle driving correlated warp yarn, different heald-lifting beams can drive different heddles in a same row to have reverse-direction motions, so that multi-layer three-dimensional stereo fabric with a complex structure is facilitated to be woven.

Description

technical field [0001] The invention relates to a mechanical device of a loom, in particular to an air-driven three-position double-shed dobby shedding mechanism. Background technique [0002] Due to the constraints of the space of the loom itself, the minimum thickness of the heald frame and the maximum stroke of the shed, the current dobby shedding device is equipped with a maximum of 28 heald frames, such as figure 1 As shown, in the frame 20, a front upper support 21, a rear upper support 22, a front lower support 23, a rear lower support 24, a sley foot 27, a crankshaft 26, and 25 dead centers behind the reed can be seen. The first page of heald frames 28 to the last page of heald frames 29, because the same piece of heald frame can only stop at the upper or lower two positions to form a shed, the healds of the same row can only be driven by the same piece of heald frame, which cannot meet the requirements The weaving of multi-layer three-dimensional three-dimensional ...

AI Technical Summary

Problems solved by technology

[0004] The air-driven three-position double-shed dobby opening mechanism provided by the present invention can solve the problem that the number of heddle-lifting beams accommodated in the space of the loom cannot meet the requirements of layer-by-layer staggered weaving of double-weft weaving by multi-layer three-dimensional fabrics; The same piece of heald beam cannot realize the problem of staying in the upper, middle and lower positions to form a changeable double shed; the problem that different healds in the same row cannot be driven by several pieces of heald beam

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