Abstract: A winder is provided for winding synthetic filament into packages formed on a rotatable chuck which is directly driven by a drive motor. The speed of the drive motor, as represented by a suitable signal, is compared with a limit therefore, as represented by a second signal. The limit speed is reduced during formation of a package as an inverse function of the package diameter.

Abstract: The electrical circuit between the power supply line and each motor or motor pair has an apparatus for re-transferring power from one mechanically driven and/or electrically braked motor to another of the motors. This apparatus includes a levelling or equalizing circuit and a plurality of back coupling devices such as diodes arranged in opposition in series. Each back coupling device electrically connects the intermediate DC circuit loosely to the levelling circuit. Upon braking of a motor, the power flows back through the associated intermediate circuit and then via the back coupling devices and levelling circuit to the other motors.

Abstract: The deviations in measuring the density of the fiber strand caused by manufacturing tolerances in the take-off rolls are monitored by integrating the deviations in densities from a preset value over periodic intervals in a control device. The integrator is controlled by periodic impulse signals and is used to adjust the transporting air stream so as to regulate the pressure drop to achieve an even strand.