Back to results
US 4,712,906 AGranted
Electrostatographic apparatus having a transfer drum
AssigneeEastman Kodak Company
InventorsRose M. Bothner, James L. Butler
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeEastman Kodak Company
InventorsRose M. Bothner, James L. Butler
Estimating the term…
An electrostatographic copier or printer includes a transfer apparatus which transfers two or more images to the same surface in registration, for example, to form a multicolor image. The copier or printer forms large size electrostatic images on a moving image member with the long dimension of the images parallel to the direction of motion and small size images with their long dimension across the direction of motion. A transfer drum with a circumference substantially equal to the distance between comparable points on the image member between consecutive large images or pairs of small images transfers consecutive large images or pairs of small images in registration. The preferred transfer drum is of the type which rotates secured copy sheets into transfer relation with two or more toner images to receive them in registration. The drum includes means for either securing one large copy sheet or two smaller copy sheets. This doubles the speed of the copier or printer when in the smaller sheet mode.
In a transfer apparatus, for an electrostatographic copier, printer or the like, for transferring a plurality of toner images, electrostatically held to a moving image member, to copy sheets which copy sheets are moved to said transfer apparatus in timed relation with the arrival of the toner images to be transferred, said transfer apparatus including a transfer drum having means for securing a first copy sheet to the periphery of said drum and means for rotating the drum to bring the secured copy sheet into transfer relation with more than one of said images as said images are moved by the image member past the transfer apparatus, to transfer said more than one images in registration to the first copy sheet;
In electrostatographic apparatus of the type in which a series of electrostatic images are formed on a moving image member, the images are toned by the application of toner thereto and the toner images are transferred therefrom, at least two of the images being transferred to the same surface in registration, the improvement comprising:
In electrostatographic apparatus of the type in which a series of toner images of different color are formed on an image member and then presented in order to a transfer drum, transferred directly to the surface of the drum in registration as the drum rotates repeatedly into transfer relationship with the image member and then transferred in one step from the transfer drum to a copy sheet, the improvement comprising:
Dependencies are inferred from the claim text.