Printer or copier for simultaneously printing a supporting material on both sides
AssigneeOcéPrinting Systems GmbH
InventorsMarkus Löbel, Vilmar Eggerstorfer, Manfred Viechter, Albrecht Gerstner, Karl Zappe
Life of this patent
Estimating the term…
Abstract
A printer or copier operates to print a carrier material on both sides. A transfer station in the printer or copier has two transfer bands which transfer toner images onto the supporting material. A transfer corotron recharges the toner particles to a polarity for transfer to the carrier material at a transfer location. A first transfer mode provides for accumulating a plurality of toner images on the transfer band before transfer to the carrier material. A second transfer mode provides continuous transfer of the toner image to the carrier material.
Claims35
A printer or copier, comprising:
- a transfer station for simultaneous both-sided printing of a carrier material;
- a first transfer module at said transfer station, including:
- a first endless transfer band operable to carry toner particles of a first polarity in a region of a transfer printing location;
- a second transfer module at said transfer station, including:
- a second endless transfer band operable to carry toner particles of a second polarity in the region of the transfer printing location;
- apparatus operable to guide the carrier material at the transfer printing location between said first endless transfer band and said second endless transfer band;
- an electrostatic field generator at the transfer printing location that effects separation of the toner particles of each transfer band from said respective transfer band as a result of electrostatic forces and causes the toner particles to adhere to a surface of the carrier material lying opposite said respective transfer band;
- a switchable transfer printing station in each of said first and second transfer modules,
- in a first operating mode, said switchable transfer printing station initially keeps said respective transfer band at a distance from the carrier material so that a plurality of toner images are arranged on top of one another on said respective transfer band and the carrier material does not move forward at the transfer printing location and then conducts said respective transfer band close to the carrier material in order to transfer the toner images arranged on top of one another onto the carrier material in common, and
- in a second operating mode, said switchable transfer printing station conducts said respective transfer band close to the carrier material in order to continuously print monochromatic toner images onto the carrier printer.
Dependencies are inferred from the claim text.