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| | Heat fixing roller having powder metal gudgeon - Patent 5094613 |
 | | Gudgeons were made experimentally, under varying conditions, from several types of austenitic stainless steel powder including AISI type 316 powder having particle sizes -10+25 mesh, -30+50 mesh, -50+100 mesh, and -100 mesh as shown for example in FIG. |
 | | According to the present invention, the sintered gudgeon 34A, 34B with the undercut or groove 64 machined therein, is thereafter connected to the core 30 of the roller 20. |
 | | The result is a heated roller with gudgeons that can each safely withstand the substantial forces necessary to produce the required fixing pressures, and for substantially longer lives than plastic gudgeons, and gudgeons that have a thermal conductivity of only about 5.0 (Btu-ft/hr-ft.sup.2 -.degree.F.) at the high temperature of 400.degree. |
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