| 摘要 |
PURPOSE:To attain uniform and excellent depression even at both high and low temperatured by using bimetal whole length is changed nearly linearly against temperature change as a depressing means. CONSTITUTION:A compression spring (a) has a property that it is expanded to a height up to lH1 at a high temperature and contracted to a height of lL1 at a low temperature, and a compression spring (b) has an opposite property. Then, for example, the vicinity of a head comprising a metallic base 1 pressed by a support roll 4 and a ceramic base 2 is pressed by the compression spring 4 and the vicinity at both ends is pressed by the compression spring (b). Thus, the center of the head is deformed at a high temperature normally so as to be floated from the support roll, but the center of the head is depressed with a large pressing force by the compression spring (a) and the vicinity at the both ends of the head is contracted by the compression spring (b), then the pressure balance between the deformation of the head and the compression springs (a, b) is taken, the head is pressed closely to the support roll 4 to prevent the floating fo the head.
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