Method and apparatus for controlling a thread storage and feeder device
AssigneesAktiebolaget IRO, Aros Electronics AB
InventorJerker Hellstrom
Life of this patent
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Abstract
The present invention provides a method and apparatus which enables thread to be wound onto the motor driven storage drum of a thread storage and feeding device for a thread processing machine strictly continuously and uniformly with the aim of ensuring that the thread as wound off the thread supply bobbin is wound onto the storage drum in such a way that variations in the tension of the thread as pulled off the storage drum are eliminated. This is achieved by controlling the number of revolutions of the motor in response to a control signal which is derived from the thread intermediate supply on the drum and the actual thread consumption, i.e., the average speed of the thread leaving the drum.
Claims13
A method for controlling the rotational speed of a winding member of a thread storage and feeding device for a thread processing machine which includes a thread storage drum for intermediate storage of thread from a supply bobbin and an electric motor for rotating said winding member, comprising the steps of:
- detecting the amount of the thread supply on said thread drum and providing an electric signal related thereto;
- providing an electric signal representative of the average rate of consumption of thread from said drum;
- combining both of said electric signals to provide an electric control signal;
- and using said control signal to control the rotational speed of said motor.
Apparatus for controlling the rotational speed of a winding member of a thread storage and feeding device for thread processing machines which includes a thread drum for momentarily storing thread from a supply bobbin in the form of a thread supply, comprising an electric motor for driving said winding member, sensing means responsive to the amount of said thread supply momentarily present on said thread drum and a signal processing means connected between the sensing means and the electric motor, which in a lower range a, an upper range b and a middle range c, provides for different output signals controlling the rotational speed of the motor, characterized in that the signal processing means (14, 16, 18, C18, 20) includes a signal correction means (16) which stores the value of the output signal used in range c before this range has been left for range a or range b and that the signal processing means corrects the value stored in the correction means when the yarn supply is either in range a or range b.
Dependencies are inferred from the claim text.