What you need to know about rapier loom sprockets

The main transmission device of rapier loom drives the sprocket drive wheel to rotate, so that the rapier head and the sword belt can carry out filling insertion.Here's what you need to know about sprockets.

Sprocket drive wheel function and standard

1) the role of the chain wheel.Sprocket wheel is the main part of rapier loom to complete weft insertion.Rapier looms have two identical sprockets, one on each side of the loom.It reciprocates and controls the rod belt on the sprocket teeth.As the rapier belt moves from the sprocket teeth to the fixed guide rail, the movement of the rapier belt changes from curved to straight motion.At the same time, the rapier heads arranged on the left and right sword belts are connected with the filling yarn to complete the filling insertion.

2) The standard of sprocket.

A.The surface of the sprocket, including the teeth, shall be smooth and free from waste edges, burr subsidence or air bubbles, so as not to interfere with the fit of the belt.

The performance of bay sprocket should be stable, reliable and flexible.Sprocket tooth radial runout, tooth profile tolerance, sprocket inner diameter tolerance and concentricity must meet the requirements of the drawing.When installing, ensure that the sprocket is firmly locked by the clamp to avoid loosening and slipping.

C.The sprocket should have excellent wear resistance and long service life.Material selection, accurate processing technology, heat treatment, surface treatment, carbon fiber, reinforced nylon, glass fiber proportion adjustment is crucial to the service life of the sprocket.

Sprocket classification and technical requirements

1) The classification of chain wheel.According to the material used, the sprocket drive wheel is divided into carbon fiber composite sprocket and all metal sprocket.Some sprockets are classified as follows.

Classification of sprockets

Classification of sprockets

The sprocket should be selected to match the rapier loom.Each sprocket is used for a particular loom.Sizes, shapes and specifications vary, so sprockets must be purchased according to the part number in the loom model.

2) Technical requirements of sprocket.The sprocket specifications are generally given by the rapier loom manufacturer according to the performance of the loom.Main technical requirements include outside diameter, inside diameter, number of teeth, radial runout, concentricity, surface roughness, tooth side roughness, hardness, resistance value (carbon fiber sprocket), etc.Some sprocket dimensions are shown below.

Partial sprocket size parameters

Partial sprocket size parameters

As for the specific technical parameters of metal sprocket, each loom manufacturer has its own requirements.The general criteria are shown below.

Sprocket general standard

Sprocket general standard

3. Application of sprocket

Because there are so many types of sprockets, each loom manufacturer has different requirements and instructions in their adjustment and maintenance manuals.However, the application considerations are similar, with some differences in the specific parameters to be adjusted.Here are some tips for using a sprocket

1) Check the appearance of the sprocket by visual inspection and hand feeling, whether it is smooth, whether there is waste edge, burr and crack.

2) Put the rapier belt on the sprocket to stimulate the running state, and observe whether the tooth surface contact surface is fit.If they don't fit, analyze why.

3) When adjusting, the thickness of the rapier belt must not be higher or lower than the tooth height of the rapier sprocket.Adjust the gap between the rapier and the seat according to the loom manufacturer's instructions until the movement is smooth.The clearance value is too small, the sprocket transmission resistance is large;If it is too large, the belt will jump, affecting the weft delivery and even causing damage to the tip.

4) Under normal circumstances, the sprocket is used twice by changing the Angle of 180°.

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