Rieter

Gear change positions of the roving frame (on old roving frames)

Index

Fig. 28 – Gearing diagram of roving frame (Rieter)

Main shaft drive discs (P)

These drive discs provide the only opportunity to adjust spindle rotation speed.

Infeed change wheel (A)

This influences the tension in the slivers between the creel and the infeed to the drafting arrangement.

Break draft wheel (V)

This enables the rotation speed of the middle cylinder (d2) to be changed, thereby changing the break draft with simultaneous alteration of the main draft. The break draft must be adapted to the material.

Main draft wheel (N)

A change here results in simultaneous variation of the rotation speeds of the middle (d2) and infeed (d3) cylinders. Since the rotation of delivery cylinder (d1) remains unchanged, the main draft is altered, as is the total draft.

Twist wheel (D)

Replacement of this wheel results in a variation of all speeds, except that of the flyers. Since the roving twist arises from the relationship between flyer rotation and delivery speed, a change in twist level arises from adjustment here.

Auxiliary change wheels (H,G)

This is an auxiliary twist change in order to adjust the twist level within broad ranges.

Lift change wheel (W)

The lift speed of the bobbin rail is influenced by this element, and hence the laying density of roving coils on the bobbin. A wheel should be chosen such that the coils of the first layer lie close to each other and practically hide the tube. The coils should also be arranged closely adjacent, but not on top of each other. In this way, the bobbin is made to take up a lot of material.

Auxiliary change wheels (F,E)

These are ancillary to the lift change wheel and again enable adjustments over broad ranges.

Cone drum change wheel (K)

If the diameter of the tube is altered, the starting speed of the bobbin must be adjusted accordingly. Since the ratchet wheel has not been operated at this stage, the adjustment cannot be made by means of the builder motion. The starting position of the cone belt can be changed or, when this is no longer possible, another cone change wheel can be substituted.

Ratchet change wheel (S)

This determines the amount by which the belt is shifted at each operation of the ratchet and therefore must be adjusted precisely to the increase in bobbin diameter.