Winding – tensioning – or guiding – Tension control or brake – Take-up coil drive control
Patent
1996-04-26
1998-03-10
Mansen, Michael
Winding, tensioning, or guiding
Tension control or brake
Take-up coil drive control
242417, B65H 5938
Patent
active
057251746
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for winding a yarn which advances at a constant speed.
DE 39 33 048 discloses an apparatus of the described type and which includes a traversing mechanism for reciprocating the yarn transversely to its direction of advance, a winding spindle which is driven by a spindle motor, a compensating arm which monitors the slack of the yarn upstream of the traversing mechanism, a measuring device for generating a measured value of the position of the compensating arm, and a controller which converts the measured value of the position to a control value for the motor.
In the above described apparatus, the slack of the compensating arm is controlled via the adjustment of the spindle speed by means of a PI controller, which is switched on after threading the yarn and after starting up the yarn traversing mechanism. Due to the considerable integral proportion of the controller, the spindle drive motor responds only with a delay to changes in the slack of the yarn loop formed by the compensating arm. Disadvantageous in this connection is that for purposes of threading the yarn it is necessary to switch over to a PD controller.
It is the object of the invention to further improve the winding machine with its control such that the control is in a position to level off, without a switchover, all oscillations in the position of the compensating arm, even those oscillations which are caused by the reciprocating movements of the yarn traversing mechanism.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by the provision of a winding apparatus which comprises a winding spindle which is adapted to coaxially receive a winding tube, a drive motor for rotating the winding spindle, and a yarn traversing mechanism for reciprocating the advancing yarn transversely along the winding spindle. A compensating arm system is provided for monitoring the slack of the advancing yarn upstream of the yarn traversing mechanism and which includes a pivotally mounted compensating arm which is pivoted upon a difference between the take up speed and the speed of the advancing yarn. A sensor is provided for sensing the pivotal position and the speed of pivotal movement of the compensating arm, and generating a pivotal position value and a speed of pivotal movement value, with the speed of pivotal movement value representing the direction of movement and the speed of the compensating arm. Also, a controller is provided which acts to superimpose the pivotal position value and the speed of pivotal movement value of the sensor and so as to produce a control value which controls the speed of the drive motor as a function of the superimposed values.
The above apparatus achieves an interdependence of the motor speed on the one hand and the position and speed of the compensating arm on the other, without the planned changes in the position and the speed of the compensating arm, which are caused in particular by the yarn traversing mechanism, exerting a negative influence on the adjustment of the spindle speed, and without leading in particular to fluctuations of the spindle speed.
It is thereby accomplished to impart a nonlinear performance to the entire control circuit which consists of the spindle, the spindle drive motor, the controller, and the compensating arm. This means, that not every change with respect to the position and/or speed of the compensating arm leads to a proportional change in the control value which is predetermined for the drive motor of the winding spindle for adjusting the spindle speed.
As a result of the design of the invention, and as described in detailed below, it is further achieved that the controller is programmable and adjustable within wide ranges, so as to be able to cover all operating conditions and to convert same into discrete control values, and so as to be able to sensitively adapt the control to occurring operating conditions, with even extreme conditions, such as, for example, threa
REFERENCES:
patent: 3713009 (1973-01-01), Poppinger et al.
patent: 4234133 (1980-11-01), Enneking
patent: 4966333 (1990-10-01), Bosch
patent: 5277373 (1994-01-01), Morton
patent: 5541832 (1996-07-01), Nakajima et al.
patent: 5566065 (1996-10-01), Hansen et al.
Barmag-Spinnzwirn GmbH
Mansen Michael
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