| 摘要 |
A band of textile fabric is spirally wound around the remote peripheral portions of a drying cylinder and a guide roller and tensioned between them to the desired degree to effect stretching or permit shrinking of the band. The guide roller periphery is defined by circumferentially spaced rods connected by pivotably connected struts to a hub carried on and slidable along the roller axle. An adjusting motor connected by mechanical linkage to the hub effects displacement to change the angle of inclination of the struts relative to the axis and thereby to effect or change conicity of the roller to adjust tension on the band. Alternatively, the struts may be fluid-operated jacks which are variable in length. Mechanism including a tension sensor actuates the motor to correct changes in tension. The roller axle is tiltable conjointly with changes in conicity to maintain the upper peripheral portion parallel to the drying cylinder. If the rods are segmented, pivotably connected together and each segment is provided with its own strut and hub support, various combinations of conicity and cylindricity can be obtained along the roller length for different stretching and shrinking requirements.
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