| 摘要 |
A method and apparatus for accurately applying a cord (12) to a rotatable mandrel (14) utilizes control of cord length, rather than cord tension, as the control parameter. The apparatus includes a mandrel (14) with an inflatable diaphragm (54) mounted on an outer surface of the mandrel (14). The diaphragm (54) is selectively inflatable via a control valve (58) and source of pressurized fluid for dynamically adjusting a circumference of the mandrel (14) in response to a control input. The control input reads a tension in the cord (12) being wound. The cord (12) is positively fed to the mandrel (14) according to a defined algorithm based on the mandrel's shape, circumference and rotational speed, rather than by demand feed of the cord (12). The apparatus includes a positive feed control capstan (18) which is electronically geared. The apparatus further includes a cord-laying wheel (30) 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 (14A, 14B) while the cord (12) is applied. A center distance between the first and second pulleys (14A, 14B) is selectively adjustable to control cord tension in the cord (12).
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