Alarm or warning device for signaling left-behind master or original
US4399431A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1981 |
| Grant date | Aug 16, 1983 |
| Priority date | — |
| Expiry date | Oct 7, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/50
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An alarm system for the copying machine for giving the audio or visual alarm signal when an operator leaves a copying machine without taking a master or original out of it after a copying operation. The alarm system includes a master detection means for detecting whether or not a master or original is set on a master or original stand and either a copy detection means for detecting whether or not one or more copies are present in a copy discharge tray or an operator detection means for detecting whether an operator is within a predetermined range from the copying machine. The alarm system is activated if, after a predetermined number of copies have been printed, the copy detection means detects the absence of a copy in the discharge tray or the operator detection means detects that the operator is out of a predetermined range when the master or original detection means detects the presence of the master on the master or original stand, whereby the audio or visual warning signal is given to the operator so as to take out the master or original.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.