Image forming apparatus with plural developing devices

Details Image forming apparatus with plural developing devices Image forming apparatus with plural developing devices

1987-08-27

1988-09-27

Prescott, A. C.

Photocopying

Including fiber optics

355 3DD, 355 14D, 118645, 118657, G03G 1501, G03G 1508

Patent

active

047745436

ABSTRACT:
An image forming apparatus includes a movable image bearing member; a device for forming a first latent image and a second latent image; a first developing device for developing the first latent image using a first developer containing magnetic particles and toner particles to form a first developed image; a second developing device, disposed downstream of the first developing means with respect to movement direction of the image bearing member, for developing the second latent image on the image bearing member bearing the first developed image and the second latent image, using a second developer which is different from the first developer, the second developing device including a developer containing portion and developer carrying sleeve for carrying from the developer containing portion the second developer to a developing zone where the developer carrying sleeve is opposed to the image bearing member; and a magnetic field generating pole, in the second developing device, for providing an attracting surface for attracting magnetic particles of the first developer carried on the developer carrying member of the second developing device, the magnetic field generating pole being opposed to a developer carrying surface of the developer carrying sleeve and being disposed downstream of the developing zone and upstream of the developer containing portion of the second developing device with respect to movement of the second developer carried on the developer carrying sleeve.

REFERENCES:
patent: 4308821 (1982-01-01), Matsumoto et al.
patent: 4351604 (1982-09-01), Karasawa et al.
patent: 4591261 (1986-05-01), Saruwatari et al.
patent: 4619518 (1986-10-01), Kameyama et al.
patent: 4660961 (1987-04-01), Kuramoto et al.
patent: 4682880 (1987-07-01), Fujii et al.

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