DE4424619A1 - Method for regulating a winding speed of thread-like material - Google Patents

Abstract

Method for regulating a constant winding speed of thread-like material. During the winding of thread-like material, the rotational speed of the spindle drive motor is to be lowered in dependence on the increasing package diameter, in such a way that the thread tension follows a predetermined value during the winding operation. For this purpose, the rotational-speed/torque characteristics of any number of different thread-tension curves and the idling/torque characteristic of the motor are filed in a microprocessor control. The microprocessor control calculates from the rotational-speed/torque characteristics of a specific selected thread-tension curve and the idling torque the total torque which is assigned to the respective rotational speed and which is imparted to the drive motor as a desired current value. The invention can be used on spinning, twisting or winding machines with an individual motor drive.

Description

The invention relates to a method for controlling a constant winding speed on spinning, twisting or winding machines with single motor drive.

In a known method, the speed of the winding spindle is on driving motor depending on torque fluctuations e.g. B. regulated by thick spots in the thread or by thread breaks (DE-PS 37 17 749). It should be a constant thread tension during the up winds are kept. A basic speed is set via a speed sensor entered into the central computer based on the experience of the operating personnel, the computer shares this speed of control electronics for the individual Spindle drive motors with.

The control electronics have two control loops with different times constant. The first control loop's job is short-term torque to compensate for fluctuations. The second control loop regulates the respective Drives at maximum speed at maximum specified load torque.

A disadvantage of this method is that all spindles are central to one predetermined setpoint can be controlled, this setpoint only in Ab depending on the frequency of thread breakage in the direction of the optimal speed will change. A targeted change in speed of a single drive in Dependency on the winding diameter is not possible.

The invention has for its object the speed of the spindle drive motors depending on the growing winding diameter so that the thread tension follows a predetermined value during winding.

The task is solved by the speed in a microprocessor control Torque characteristics of any number of different thread tension curves as well as the idle torque characteristic of the winding reel Motors are filed. From the speed-torque characteristics of a specific one The micro calculates the selected thread tension curve and the idle torque processor control the total torque assigned to the respective speed, the is impressed on the drive motor as a current setpoint.

Further features of the invention result from the claims.  

The advantage of the solution according to the invention is that the speed of each one Drive depending on the continuously growing winding diameter of the spool head is lowered so that the thread tension throughout the winding time remains constant or follows a preselected curve. A scanning organ in Thread running, such as B. a dancer arm or a potentiometer for diameter detection of the bobbin is no longer necessary according to this invention.

The process is carried out below at a facility for Regulation of the winding speed described. In the associated drawing show

Fig. 1 is a block diagram,

Fig. 2 shows the diagram with the representation of the torque characteristics.

In Fig. 1 of the thread winding device, the winding body 2 with thread 10 and the drive motor 1 are shown. An electronically commu tated DC motor is preferably used. The block diagram also shows: a speed sensor 3 , a converter 4 , a microprocessor controller 5 , a memory module 6 with selector switch 7 , a mixing point 8 and a power amplifier 9 .

In the coordinate system of Fig. 2, curves C₁-C _n for the thread tension, a curve B for idling and a curve A are entered as the total torque.

In the memory block, the speed-torque characteristic curves C₁-C _n any number of thread tensile forces are stored as well as the current idle torque characteristic curve B. Depending on the winding speed, empty tube diameter and translation ratio between motor and winding shaft is selected by selecting a characteristic curve Characteristic curve set the required thread tension. For this purpose, the thread tension is measured with a hand-held measuring device when the winding head is started up for the first time, and the characteristic curve which comes closest to the technologically required thread tension is selected with a characteristic selector switch. The same thread tension is achieved on all winding heads of a machine with the selector switch in the same position. The idle torque characteristic curve is recorded each time the winding device is switched on after each reel change. The influence of the mechanical disturbance variables on the thread tension can thus be largely eliminated.

The speed sensor delivers a via the converter of the microprocessor control Speed proportional size. The controller assigns a current to this variable component corresponding to that using the selector switch or centrally via a ordered control to selected speed-torque characteristic and added to this current component the associated value from the idle torque characteristic line. The sum of the two current components is known as electricity setpoint is compared with the actual current value in the mixing point and as a difference size supplied to the motor via the power amplifier.

Reference list

1 drive motor
2 bobbins
3 speed sensors
4 converters
5 microprocessor control
6 memory module
7 selector switches
8 mixing point
9 power amplifiers
A total moment
B Idling torque characteristic
C₁-C _n speed-torque characteristic

Claims (3)

1. A method for controlling a constant winding speed of thread-like material by lowering the winding speed as a function of the ever-increasing diameter of the winding body, characterized in that any number of thread tension curves that can be called up are stored in a microprocessor control as a speed-torque characteristic curve, of which one is selected, and the current idling torque is recorded as idling torque characteristic curve and is also filed each time the take-up device is switched on, the microprocessor control unit determining a speed-dependent total torque from both characteristic curves as a setpoint for the motor drive and the constantly detected motor speed the associated one Assigns the target torque, compares it with the electronically recorded actual torque and supplies the difference to the motor as a current variable. 2. Method for controlling a constant winding speed after Claim 1, characterized in that the speed torque characteristic is preselected via a selector switch. 3. Procedure for controlling a constant winding speed after Claim 1, characterized in that the speed-torque characteristic is selected centrally via a higher-level control.