Abstract:
AN ELECTROPHOTOGRAPHIC PROCESS FOR THE PRODUCTION OF REFLEX COPIES IN WHICH A DOCUMENT IS POSITIONED ADJACENT A PHOTOCONDUCTIVE ELEMENT WHICH EXHIBITS PHOTOCONDUCTIVE DICHROISM AND HAS A PREFERRED ABSORPTION AXIS, AND IN WHICH THE PHOTOCONDUCTIVE ELEMENT IS UNIFORMLY EXPOSED THROUGH THE PHOTOCONDUCTIVE ELEMENT WITH POLARIZED LIGHT WHOSE VECTOR, RELATIVE TO THE ABSORPTION AXIS, IS SUCH THAT THE LIGHT IS NOT ABSORBED. THE POLARIZED LIGHT IN STRIKING THE DOCUMENT IS ABSORBED IN SOME AREAS, NORMALLY THE DARK IMAGE AREAS, AND DEPOLARIZED AND REFLECTED IN OTHERS, NORMALLY THE LIGHT BACKGROUND AREAS. THE LIGHT FROM THE REFLECTED AREA, BEING DEPOLARIZED, CONTAINS LIGHT WITH AN ELECTRIC VECTOR WHICH WILL BE ABSORBED BY THE PHOTOCONDUCTIVE ELEMENT AND THE ELEMENT IS THUS EXPOSED TO A PATTERN CORRESPONDING TO THE PATTERN OF THE DOCUMENT. THIS RENDERS THE PHOTOCONDUCTIVE ELEMENT CONDUCTIVE AND CAPABLE OF TRANSPORTING AN ELECTROSTATIC CHARGE AND, HENCE, PERMITS THE FORMATION OF AN ELECTROSTATIC CHARGE PATTERN CORRESPONDING TO THE DOCUMENT.
Abstract:
An electrophotographic element is cleaned of residual toner by providing a cleaning means such as a rotating brush in contact with the element or an airblast to remove residual toner particles from the element while also providing means such as a fluorescent lamp to concurrently illuminate the portion of the element being cleaned.
Abstract:
1281485 Electro-photographic copiers INTERNATIONAL BUSINESS MACHINES CORP 28 April 1970 [19 May 1969] 20215/70 Heading G2H After transfer of a developed image from a photo-conductive drum, residual developer is cleared therefrom by a brush 41, Fig. 1, or an air knife 101, Fig. 4; a lamp being provided at the cleaning station to illuminate the drum and disperse residual charge therefrom while the drum is being cleared. In Fig. 1, lamp 55 is mounted inside rotating brush 41, a vacuum cleaner 45, 47 drawing off developer particles. The construction of the brush and materials therefor are described in detail. In Fig. 4, a lamp 103 and air knife 101 are employed, developer particles being drawn off by suction through a housing 105.
Abstract:
1284373 Ink ribbon mechanism INTERNATIONAL BUSINESS MACHINES CORP 7 May 1971 [30 June 1970] 13616/71 Addition to 1,183,173 Heading B6F Ink ribbon mechanism includes a drive roller 16 engaging the outer turn of ribbon 12 on a take-up spool 14, the spool 14 being capable of tilting with respect to a spindle 13, and guide means 17, 19 are provided to limit displacement of successive turns of the ribbon axially with respect to the spool. The guide means 17, 19 may be in the form of flanges on the drive roller 16 as shown. The winding mechanism may be employed with thin ribbons in cartridges of the kind described in the parent Specification.