Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1983-07-01
1985-09-03
Gilreath, Stanley N.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 18DD, 242 45, B65H 5402
Patent
active
045387729
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus for winding flexible material on to a mandrel, and is particularly, but not exclusively, applicable to the winding of thread into a package.
Apparatus is known for winding flexible material on to a mandrel, said apparatus including a motor for rotating the mandrel and means for applying pressure to the periphery of the package being wound in order to control the packaging density. The pressure-applying means may consist, for example, of a bar or roller, and the flexible material passes between the bar and the package as it is being wound. Normally the bar or roller is fixed in the vertical direction, and the pressure results from the reaction force caused by pressing the package against the bar or roller. For this purpose, the mandrel may be rotatably mounted at one end of an arm which is pivotted at the other end about a horizontal axis. Adjustable weights may be connected to the arm in order to press the package against the bar or roller.
It is to be understood that variations in the value of the pressure applied to the package will cause variations in the packing density. As the amount of material in the package increases, the weight of the package will increase, and this will cause an increase in the applied pressure. If it is required to maintain a constant packing density, means will have to be provided to reduce the weight on the arm as the diameter, and hence the weight, of the package increases.
At the present time, adjustment of the weight is normally carried out manually by the operator. This adjustment requires skill, and is frequently unreliable because of effects which the operator is unable to take into account. For example, frictional forces are liable to vary during operation of the weight-compensation apparatus, and the operator will not normally be able to compensate for such variations. In addition, the package may be distorted during winding due to penetration of the pressure bar or roller, and again it is difficult for an operator to assess such penetration and make the necessary adjustment of the weight.
Accordingly, it is an object of the present invention to provide apparatus having a control system for automatically controlling the packing density by controlling the pressure applied to the periphery of the packing during winding.
From one aspect the invention consists in apparatus for winding flexible material on to a mandrel including a motor for rotating the mandrel; means for applying pressure to the periphery of the package of said material wound on the mandrel; means for measuring a value which varies with the pressure applied to the package; means for comparing the measured value with a reference value to produce an error signal; and means for varying the pressure in dependence on said error signal to reduce any difference between the measured value and the reference value.
The measured value may be the actual pressure applied to the package. As already stated, the pressure-applying means may be a bar or roller and, in this case, the measured value may be the load pressure on the bar or roller. However, since the rolling resistance will vary with the applied pressure, it is preferred that the measured value should be the rolling resistance or a quantity which varies with the rolling resistance. For example, the measured value may be the circumferential force applied to the pressure-applying means by rotation of the package or may be the load on the motor due to the rolling resistance. It is to be understood that the load on the motor will be higher during acceleration than during normal running and, accordingly, means may be provided to inhibit the operation of the pressure-varying means until the motor has reached its normal operating speed.
In yet another alternative arrangement, separate means are provided to measure the deformability of the package and this measurement may be used as the measured value.
This measurement may be obtained by a separate roller arranged to measure the peripheral force on the roller due to deformation of the
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