Electric heating – Inductive heating – With heat exchange
Patent
1995-03-10
1998-06-09
Leung, Philip H.
Electric heating
Inductive heating
With heat exchange
219652, 219469, 492 46, 492 15, 226194, H05B 614
Patent
active
057638594
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims the priority of PCT Application No. PCT/CH94/00104, filed Jun. 2, 1994, which in turn claims the priority of Swiss Application No. 1680/93-4, filed Jun. 4, 1993, and Swiss Application No. 925/94-0, filed Mar. 28, 1994, the disclosures of which are incorporated herein by reference in their entireties.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a draw roller unit for draw winding machines, draw-spinning winding machines and draw twisting machines wherein the draw roller unit includes an inductor for heating a godet, a rotatably journalled drive shaft for journalling the godet, and a housing for both the attachment of a carrying cylinder, with the carrying cylinder carrying the inductor, and for the retention of bearings for the drive shaft.
2. Discussion of the Background of the Invention and Material Information
Such draw roller units are known, e.g., from European patent applications 0 349 829 A2 and 0 454 618 A1, both applications being assigned to the assignee of the present invention.
Such draw roller units have a high operating speed, in order to e.g. convey and heat filament threads with up to 6 000 m/min onto the heated galettes. Here one galette can have a weight of, e.g., 25 kg so that the combination of mass and high speed invariably leads to vibrations which can be transmitted within the draw roller units and cause resonances which may give rise to malfunctions during operation.
Inhibition of such vibrations can take place in various ways, incl. with measures relating to weight and stiffness of the parts vibrating or on the other hand by providing corresponding vibration-damping elements at suited places.
Locating such places is not easy however and requires imagination in the analyzation and the determination of possible vibrations in order to pinpoint possible vibration sources and to essentially inactivate these by placing suited damping means.
As a rule the rotating parts are arranged on dampened bearings so that next to no vibrations are transmitted to the stationary parts, but this may lead to complicated and expensive solutions depending on the construction. Furthermore, stationary parts may also create their own vibrations, e.g., concerning the inductors within the galettes which heat the casing of the galettes.
Therefore, it is the object of this invention to find new ways to inhibit the vibrations at stationary parts which can be triggered by rotating elements or mentioned own vibrations of stationary parts.
SUMMARY OF THE INVENTION
This object is achieved according to the invention by the features specificied in the claims.
Specifically, this invention pertains to a draw roller unit for draw winding machines, draw-spinning winding machines and draw twisting machines with the draw roller unit including an inductor for heating a godet, a rotatably journalled drive shaft for journalling the godet, and a housing for both the attachment of a carrying cylinder, with the carrying cylinder carrying the inductor, and for the retention of bearings for the drive shaft, wherein for the damping of vibrations, created by the operation of the draw roller unit, between the carrying cylinder and the housing, at least one vibration damper and, in combination therewith, at least one radially acting vibration damper is provided between the bearings and the housing.
In a further embodiment of the draw roller unit of this invention, a vibration damper, acting in an axial direction, is provided between the carrying cylinder and the housing.
In another embodiment of the drawing roller unit of this invention, a vibration damper, acting in a radial direction, is provided between the carrying cylinder and the housing.
In a differing embodiment of the draw roller unit of this invention, the vibration damper, provided between the carrying cylinder and the housing, is a combined axially and radially acting vibration damper.
In yet a further embodiment of the draw roller unit of this invention, the axially acti
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Wetter Kurt
Wirz Armin
Leung Philip H.
Maschinenfabrik Rieter AG
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