Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1996-12-30
1998-07-07
Mansen, Michael
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 18DD, 242 355T, B65H 67044, B65H 5402
Patent
active
057756104
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for controlling the rotary drive of a turntable, which supports at least one bobbin spindle, of a bobbin winding machine for a continuously arriving thread, which furthermore is provided with a jig motion device and with a contact roller disposed upstream of the turntable in the thread path, wherein by means of controlling the rotary drive of the turntable the contact roller is maintained in continuous circumferential contact with the bobbin package, which increases in diameter in the course of the bobbin travel and is supported by a single bobbin spindle or one of the two bobbin spindles.
EP 0 374 536 B1 describes such a method for controlling the rotary drive of a bobbin winding machine, wherein the lift of the contact roller, which is seated so that it is slightly movable, is interrogated by means of a sensor, and the rotary drive is controlled in such a way that a circumferential contact between the contact roller and the bobbin package is assured.
The method known from the cited reference is represented as a closed control circuit. Such a closed control circuit has a tendency to fluctuate, particularly under the influence of disturbances. Disturbances are, for example, vibrations of the bobbin spindle, non-circular bobbin packages and bobbin packages with surface symptoms, fluctuations in the pressure force of the contact roller, and similar ones. It is not possible to achieve a dependable operation and a good bobbin structure with the bobbin winding machine having such a control circuit.
SUMMARY OF THE INVENTION
The invention is based on the object of producing a method for controlling the rotary drive of a bobbin winding machine, which operates dependably and in a simple manner and does not tend to fluctuate.
This object is attained in accordance with the invention by calculating the respective diameter of the bobbin package by means of forming the quotient from the product of the speed of rotation (rpm) of the contact roller and the diameter of the contact roller in respect to the speed of rotation (rpm) of the bobbin spindle supporting the bobbin package, determining the angular position of the bobbin spindle supporting the bobbin package on its circle of rotation, in which the circumference of the bobbin package is in circumferential contact with the contact roller, from the calculated respective diameter of the bobbin package, and controlling the rotary drive of the turntable in such a way that the bobbin spindle supporting the bobbin package assumes the calculated angular position on its circle of rotation.
Although the speed of rotation of the contact roller is mostly constant and is therefore assumed to be a constant when calculating the respective diameter of the bobbin package, a preferred exemplary embodiment is distinguished in that the respective speed of rotation of the contact roller is detected by interrogating an appropriate sensor.
The speed of rotation of the bobbin spindle is also preferably determined by interrogating a sensor which detects it, however, when using a synchronous motor for driving the bobbin spindle it is also possible to directly use the signal triggering the synchronous motor. A preferred exemplary embodiment is distinguished in that the respective angular position of the bobbin spindle supporting the bobbin package on its circle of rotation, in which the circumference of the bobbin package is in circumferential contact with the contact roller, is read out from a table in which the angle/diameter relationship is stored. However, alternatively it is possible to perform an exact calculation by means of the geometric relationship.
In order to achieve a contact pressure of the contact roller against the bobbin package which is varied to correspond to the respective diameter of the bobbin package, it is further proposed to maintain the contact roller in a loaded rocker, wherein the load acting on the rocker, which determines the contact pressure of the contact roller against the bobbin package, is a fun
Mansen Michael
Neumag-Neumuenstersche Maschinen und Anlegenbau GmBH
Striker Michael J.
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