Magnetographic apparatus
AssigneeIwatsu Electric Co., Ltd.
InventorsNorio Kokaji, Kunio Kinoshita, Toshihiro Urano, Katsunori Saito
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Abstract
Disclosed is a magnetographic apparatus wherein a large number of copies of the same picture is produced by repeatedly using a recording drum on which a latent image of the picture is recorded, which apparatus is different from a conventional magnetographic apparatus wherein a sequence of processes consisting of a latent image recording process, a process of developing the image and a process of transferring the image is effected for production of each copy. Further disclosed herein are structural elements of a magnetographic apparatus which are suitable for producing a large number of copies of the same picture by repeatedly using a recording drum as described above.
Claims17
A magnetographic apparatus comprising:
- (a) a device for generating a magnetic latent image pattern signal;
- (b) a rotatable magnetic recording drum having a layer of metallic plating, wherein the specific resistivity of the surface of said drum is not greater than 10.sup.12 ohmcentimeter;
- (c) a magnetic recording head for recording magnetic latent images having a magnetic field of predetermined strength on said drum in accordance with said magnetic latent image pattern signal;
- (d) a developing device which supplies magnetic toner to said recording drum for developing said magnetic latent images into visible images formed by adhered toner, wherein said developing device comprises:
- (i) a rotatable developing surface located adjacent the drum;
- (ii) at least one magnet for developing a magnetic field to hold the toner on the developing surface, wherein the magnetic field of the magnet is sufficiently weak in the region where the developing surface is nearest the drum such that the magnetic field of the magnetic latent images attracts the the toner from the developing surface and the magnetic field of the magnet does not erase the magnetic latent images;
- (e) a transferring device for electrostatically transferring said magnetic toner adhered to said magnetic latent images to a recording sheet;
- (f) a fixing device for fixing said magnetic toner transferred to said recording sheet;
- (g) a cleaning device having a blade in the shape of a metallic plate for cleaning the remaining magnetic toner on said recording drum;
- (h) a recording sheets conveying device, and
- (i) a control device for controlling a magnetic latent image recording process and causing the repetition of a sequence of processes consisting of a developing process, a transferring process, a process for fixing images and a process for conveying recording sheets whereby a plurality of individual copies of said magnetic latent image may be formed from a single magnetic image after said latent image is initially recorded on said drum.
Dependencies are inferred from the claim text.