TRANSFER ROLL AND IMAGE FORMING DEVICE

• Main Author: ICHIZAWA NOBUYUKI
• Format: Patent
• Language: English
• Published: 21.02.2013
• Subjects: BEARINGS; BLASTING; CHEMISTRY; CINEMATOGRAPHY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOLOGRAPHY; LIGHTING; MAGNETOGRAPHY; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PHOTOGRAPHY; PHYSICS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WEAPONS

PROBLEM TO BE SOLVED: To prevent toner scattering in transferring toner.SOLUTION: The transfer roll includes a cylindrical conductive support 112, an inner elastic layer 113 containing a conductive agent and having Asker C hardness of 5 to 20 degrees, and an outer elastic layer 114 containing the conductive agent and having the Asker C hardness of 30 to 45 degrees, which are formed in this order. The volume resistivity [ (in)] of the inner elastic layer 113 and the volume resistivity [ (out)] of the outer elastic later 114 satisfy the expression (1): (in)> (out), which are measured by applying an application voltage 1000 V at a temperature of 22°C and a humidity of 55 RH% while no load is applied.