| 摘要 |
A method and apparatus for accurately applying a cord to a rotatable mandrel utilizes control of cord length, rather than cord tension, as the control parameter. The apparatus includes a mandrel with an inflatable diaphragm mounted on an outer surface of the mandrel. The diaphragm is selectively inflatable via a control valve and source of pressurized fluid for dynamically adjusting a circumference of the mandrel in response to a control input. The control input reads a tension in the cord being wound. The cord is positively fed to the mandrel according to a defined algorithm based on the mandrel's shape, circumference and rotational speed, rather than by demand feed of the cord. The apparatus includes a positive feed control capstan which is electronically geared. The apparatus further includes a cord-laying wheel which isolates radially directed forces from circumferentially-directed forces. A second embodiment of the invention includes the belt being rotated on first and second pulleys while the cord is applied. A center distance between the first and second pulleys is selectively adjustable to control cord tension in the cord.
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