Schaerer Schweiter Mettler Ag

Silvan Borer

A process and apparatus for the winding of a thread onto a reel. A thread is guided by a thread guide fastened to a cord. The cord is driven by a drive part, which, under the action of a transfer roller engaging in a slot, executes a harmonic oscillation. A transfer roller is attached to a disc-shaped bearing part, driven by means of a driving wheel, and can, for changing the amplitude of the harmonic oscillation, be displaced in the radial direction by utilizing an electric motor. For the purpose of approximating the thread guide movement to a triangular oscillation, a heart-shaped compensating disc, likewise driven by the driving wheel, sets a carriage in oscillating movement synchronous to the harmonic oscillation, so that, due to displaceable pairs of rollers, which are mounted on the carriage and via which the cord is led, as also via fixed rollers lying between successive displaceable rollers, in each case the path of the cord is lengthened on one side of the traversing interval and correspondingly shortened on the other side.

Apparatus for the winding of a thread onto a reel

In a method and apparatus for controlling a contact pressure which a bobbin being wound with a thread exerts on a roller, the contact pressure is controlled by an adjusting device. The roller is mounted on a balance beam. The divergence of the balance beam from a desired position thereof is determined by a sensor and is converted in a controller into a correction movement of the adjusting device. The adjusting device includes a worn gear with a spindle nut and a spindle driven by a motor which is controlled by the controller. By means of the controller constructed as a control loop, it is possible to very precisely maintain the bearing pressure throughout the winding process independently of the specific weight of the bobbin.

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Horgen, Switzerland

Silvan Borer