Developing apparatus for applying different color toners

Claim 2

A developing system comprising: rotation means, rotated in a predetermined direction at a constant peripheral velocity and including a recording medium provided on a surface thereof; first charging means for charging said recording medium; first electrostatic latent image forming means for forming a first electrostatic latent image on the surface of said recording medium which is charged by said first charging means; first developing means for carrying a first developing agent, and applying the first developing agent to the surface of said recording medium on which the first latent image is formed, thereby developing the first latent image, said first developing means having a surface opposite to said recording medium to have a gap between itself and said recording medium, and being rotated in a direction opposite to the predetermined direction of said rotation means, so that opposing surfaces are moved in the same direction, and said first developing means being rotated at a predetermined peripheral velocity higher than that of said rotation means; second charging means for charging said recording medium of said rotation means developed by the first developing agent; second electrostatic latent image forming means for forming a second electrostatic latent image on the surface of said recording medium which is charged by said second charging means; and second developing means for carrying a second developing agent and applying the second developing agent to the surface of said recording medium on which the second latent image is formed, thereby developing the second latent image, said second developing means having a surface opposite to said recording medium to have a gap between itself and said recording medium, and being rotated in a direction opposite to the predetermined direction of said rotation means, so that opposing surfaces are moved in the same direction, and said second developing means being rotated at a predetermined peripheral velocity substantially equal to that of said rotation means.

Claim 3

A system according to claim 1, wherein the first developing agent is a black developing agent, and the second developing agent is a chromatic color developing agent.

Claim 4

A system according to claim 1, further including means for applying about 0.4 mg/cm 2 of the developing agent to each of the surfaces of said first and second developing means.

Claim 5

A system according to claim 1, wherein said first developing means is rotated at a peripheral velocity substantially 1.5 times that of said rotation means.

Claim 6

A system according to claim 1, further comprising: means for transferring an image developed by said first and second developing means to a paper sheet.

Claim 9

The apparatus of claim 6 in which said toner applied to said first rotatable member is a black developing agent and the toner applied to said second rotatable member is a chromatic color developing agent.

Claim 10

The apparatus of claim 6 further including first application means for applying an AC voltage biased by a DC voltage across said first rotatable member and said rotatable image carrier; and second application means for applying a DC voltage across and second rotatable member and second rotatable image carrier.

Claim 11

The apparatus of claim 6 wherein said toner is applied to the surfaces of said first and second rotatable members in the amount of about 0.4 mg/cm 2 .

Claim 12

The apparatus of claim 6 wherein said first rotatable member is rotated at a peripheral velocity substantially 1.5 times that of said rotatable image carrier.

Claim 13

A developing system comprising: rotation means, said means rotating in a predetermined direction at a constant peripheral velocity, and including a recording medium on the surface thereof; first charging means for charging said recording medium; first electrostatic latent image forming means for forming a first electrostatic latent image on the surface of said recording medium which is charged by said first charging means; first developing means for carrying out a first developing agent and applying said first developing agent to the surface of said first recording medium on which the first latent image is formed, thereby developing the first latent image, said first developing means having a surface opposite said recording medium to form a gap therebetween, and being rotated in a direction opposite to the predetermined direction of said rotating means, so that opposing surfaces move in the same direction, said first developing means being rotated at a predetermined peripheral velocity higher than that of said rotation means; second charging means for charging said recording medium of said rotation means developed by the first developing agent; second electrostatic latent image forming means forming a second electrostatic latent image on the surface of said recording medium which is charged by said second charging means; second developing means for carrying a second developing agent and applying the second developing agent to the surface of said recording medium on which the second latent image is formed, thereby developing the second latent image, said second developing means having a surface opposite to said recording medium to form a gap therebetween, and being rotated in a direction opposite to the predetermined direction of said rotation means, so that opposing surfaces are moved in the same direction, said second developing means being rotated at a predetermined peripheral velocity substantially equal to that of said rotation means; first application means for applying an AC voltage biased by a DC voltage across said first developing means and said recording medium; and second application means for applying a DC voltage across said second developing means and said rotation means.

Claim 14

A developing system comprising: rotation means, said means rotating in a predetermined direction at a constant peripheral velocity, and including a recording medium on the surface thereof; first charging means for charging said recording medium; first electrostatic latent image forming means for forming a first electrostatic latent image on the surface of said recording medium which is charged by said first charging means; first developing means for carrying out a first developing agent and applying said first developing agent to the surface of said first recording medium on which the first latent image is formed, thereby developing the first latent image, said first developing means having a surface opposite said recording medium to form a gap therebetween, and being rotated in a direction opposite to the predetermined direction of said rotating means, so that opposing surfaces move in the same direction, said first developing means being rotated at a predetermined peripheral velocity higher than that of said rotation means; second charging means for charging said recording medium of said rotation means developed by the first developing agent; second electrostatic latent image forming means forming a second electrostatic latent image on the surface of said recording medium which is charged by said second charging means; second developing means for carrying a second developing agent and applying the second developing agent to the surface of said recording medium on which the second latent image is formed, thereby developing the second latent image, said second developing means having a surface opposite to said recording medium to form a gap therebetween, and being rotated in a direction opposite to the predetermined direction of said rotation means, so that opposing surfaces are moved in the same direction, said second developing means being rotated at a predetermined peripheral velocity substantially equal to that of said rotation means; first application means for applying an AC voltage biased by a DC voltage across said first developing means and said recording medium; and second application means for applying a DC voltage across said second developing means and said rotation means.

Claim 15

The developing system of claim 11 wherein the first developing agent is a black developing agent and the second developing agent is a chromatic color developing agent.

Claim 16

The developing system of claim 11 in which developing agent is applied to said first and second developing means at a rate of about 0.4 mg/cm 2 .

Claim 17

The developing system according to claim 11 wherein said first developing means is rotated at a peripheral velocity substantially 1.5 times that of said rotation means.

Claim 18

The developing means system of claim 11, further including means for transferring an image developed by said first and second developing means to a paper sheet.