Basic wire mesh knowledge: composition, role and classification of let-off mechanism

Composition: let-off cam, let-off moving rod, let-off 

connecting rod (tie rod), let-off regulator (including: 

let-off backstop, let-off swing arm, let-off change gear,

clutch, worm gear, worm gear, bevel gear), let-off roller,

let-off handwheel, warp roller, let-off shaft, let-off pin, 

tension roller, counterweight rod (heavy pressurized 

rod, with 4 adjustment holes), weighted weighted rod 

(hanging weights on the top), weighted weights (pressure 

weights), left double lever Right double rod (with tension 

roller on top), ring lifter (2 pieces), let-off pedal, let-off 

toggle, let-off vertical shaft, let-off vertical shaft holder, 

let-off vertical shaft bevel gear, 20 teeth wide gear, 

weighted pressurized rod shaft, brake, embedded clutch, 

teeth embedded bevel gear, swing arm shaft support.

1. Role

(1) Feed the warp wires evenly from the warp roller;

(2) Adjust the length of each let-off;

(3) Adjust the amount of warp wire tension as needed;

(4) Changing the time of delivery of menstruation as needed.

2. Classification

In general weaving machines, the let-off mechanism is 

divided into negative and positive let-off. The so-called 

positive let-off, that is, the feeding action is active, the 

feeding length is not affected by the size of the warp 

wire tension, and is not affected by the length of the 

winding net. Negative let-off, that is, the let-off action 

is passive every time the warp length is affected by the 

tension of the warp wires and the influence of the rolled 

wire.