Let-off mechanism, rapier loom comprising same, and control method for let-off mechanism

Abstract

The invention discloses a let-off mechanism, a rapier loom comprising the same, and a control method for the let-off mechanism. Compared with the prior art using individual control technology, the link between let-off mechanisms is enhanced; certain rotation speed ratios are provided for all let-off rollers through setting a transmission ratio for a speed changer; during a let-off process, intermediate driving values of the speeds of the multiple let-off rollers are obtained through the detection performed by sensors and the calculation performed by a controller, the mean value of the multiple intermediate driving values is worked out, and the rotation speed change of a driving motor is controlled according to the mean value; the improvement of the accuracy and stability of the rotation speed change is facilitated; the rotation speed change directions of the let-off rollers are the same all the time, so that the uniformity of the change tendencies of warp yarns on all the let-off rollers is facilitated; and the reduction of the influence, caused by the rotation speed change of the driving motor, on the instant tension of the warp yarns can be facilitated through a step of calculating the intermediate driving values and a step of calculating the result driving value, so that the stability of the tension of the warp yarns can be guaranteed and the tension tends to reach a preset value of the controller.

Description

technical field [0001] The invention relates to the field of textile equipment, more specifically, it relates to a warp yarn feeding equipment. Background technique [0002] The rapier loom is currently the most widely used shuttleless loom. In addition to the characteristics of high speed, high degree of automation, and high-efficiency production of the shuttleless loom, its positive weft insertion method has strong variety adaptability and can adapt to The weft insertion of various yarns, and the rapier loom also has obvious advantages in multi-color weft weaving, and can produce yarn-dyed products with up to 16 color weft yarns. As shuttleless looms replace shuttle looms, rapier looms will become the main production machine for woven fabrics. The rapier loom is composed of a warp beam, a warp let-off device, a working platform, a weft feeding device and a cloth winding device. The warp thread on the warp beam enters the working platform through the warp let-off device, a...

AI Technical Summary

Problems solved by technology

Independent warping is performed on the warp yarns with too small tension. However, the warp let-off structure of the loom with double warp beams is very complicated at present, and the operation of the loom is not stable enough, and the tension between the two warp beams cannot be adjusted. Effective control with low production efficiency

[0005] The patent document with the application number 201310693628.X discloses a new double warp beam rapier loom, including a frame, a warp let-off mechanism, a weft beating mechanism, a drive system, and a winding mechanism. Wallboard, the rear of the let-off mechanism is provided with a heald frame mechanism, the first let-off beam is horizontally fixed on the warp beam seat, and the two ends of the second let-off beam are fixed on the fixing device independent of the frame. Two warp let-off beams are arranged in parallel below the first warp let-off beam by a fixed bracket independent of the frame, and the first warp let-off beam and the second warp let-off beam are driven by an independent drive system. The double warp beams of this technical scheme are placed up and down, although It can save a certain amount of space, but combined with the actual situation, there are a large number of warp threads wound on the warp beam, and its overall mass is very large. The installation of the upper warp beam is inconvenient, and there is no connection between the upper and lower warp beams. Mechanism and drive system, for the entire rapier loom, increase the cost of use, and the installation and adjustment between multiple sets of mechanism systems is inconvenient. In this technical solution, the setting of the upper and lower drive motors can easily affect the operation of the rapier loom Stability. Although a series of means have been added to the technical solution to control stability, this virtually increases the complexity of the overall structure and installation cost, and is not conducive to adjustment. In summary, there is room for improvement in the existing technology place

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