Device for preventing overheating of electrophotographic fixing device
US3989926A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Jan 22, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/275
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A thermal fixing device for a xerographic reproducing apparatus includes a thin planar resistance heating element having a low thermal mass and a high coefficient of thermal expansion. The heating element is supported in such manner that one end thereof is free to move linearly under thermal expansion to activate a heater displacement detector comprising a pivotally mounted lever arm having a right angle configuration. One end of the lever arm is received in an opening in the heating element and the other end form a contact of a normally open switch which is adapted to be closed by pivoting of the arm due to expansion of the heating element. Closure of the switch activates a power controller to interrupt the power supply to the heating element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.