摘要:
An image forming apparatus of the type in which it is possible to select an image forming station for image formation from a plurality of image forming stations, includes: a plurality of image forming stations each having an image bearing member for bearing a latent image and a developing device for developing the latent image on the image bearing member by a developer; transfer members adapted to come into contact with a medium member to induce a charge and to electrostatically transfer developed images formed in the plurality of image forming stations to the medium member; and a current control portion for controlling an electric current flowing through the transfer members, wherein the current control portion effects control such that no electric current flows through the transfer member corresponding to an image forming station not being used for image formation.
摘要:
An image forming apparatus for conveying recording material. The image forming apparatus includes an image bearing member for bearing a toner image, a recording material convey belt for bearing and conveying a recording material, a roller for supporting the recording material convey belt and having an insulation layer, and an electricity removal device for removing electricity from the insulation layer. The toner image on the image bearing member is electrostatically transferred onto the recording material borne by the recording material convey belt, and the roller supports the recording material convey belt at a separation position where the recording material is separated from the recording material convey belt.
摘要:
An image forming apparatus includes an image bearing member for bearing an image, a recording material bearing member for bearing a recording material electrostatically, and a transfer member for transferring the image on the image bearing member electrostatically to the recording material borne by the recording material bearing member by being put into contact with the recording material bearing member, wherein a length of a contact area between the recording material bearing member and the transfer member is less than that of a contact area between the image bearing member and the recording material borne by the recording material bearing member in a conveyance direction of the recording material bearing member, wherein the recording material bearing member has a first layer for bearing the recording material and a second layer in contact with the transfer member in an image transfer, and wherein a surface resistivity of the first layer is lower than a surface resistivity of the second layer.
摘要:
An image forming apparatus includes a toner image forming unit for effecting an image forming operation to form toner image on a recording material, wherein the toner image comprises chromatic toner image components with different colors and a transparent toner image component overlaid thereon; a fixing unit for effecting a fixing operation to heat and fix the toner image on the recording material; a switching unit for switching, in accordance with information relating to a maximum toner amount per unit area in a zone in which the transparent toner component is present, operations to a mode in which the formation of the toner image is effected through a plurality of such image forming operations, and the fixing of the toner image is effected through a plurality of such fixing operations.
摘要:
A control apparatus for controlling an image forming system is provided. The image forming system includes transparent toner image forming device configured to form a transparent toner image on a sheet on which a color toner image has been fixed and includes fixing device configured to fix the transparent toner image formed on the sheet. The control apparatus includes an obtaining means for obtaining information of a first part of a color toner image area on which transparent toner is to be applied with a first amount per unit area after the color toner image is fixed, and a control means for controlling the transparent toner image forming device to apply the transparent toner, with a second amount per unit area, on a second part of the color toner image area which is the color toner image area excluding the first part, after the color toner image is fixed. The second amount is smaller than the first amount.
摘要:
In an image forming apparatus, an image forming condition is changed depending on whether or not a recording material on which a toner image is formed is ordinary high gloss paper or thermoplastic resin coated paper. More specifically, in the case where a high gloss mode is selected during image formation, judgement whether or not the high gloss paper is the ordinary high gloss paper or the thermoplastic resin coated paper is made. In the former case, a screen line number is set to 150 lpi, and in the latter case, the screen line number is set to 200 lpi. As a result, image failure due to collapse of a toner layer (during fixation) on the ordinary high gloss paper is prevented and high-quality toner image is formed on the thermoplastic resin coated paper.
摘要:
An image forming apparatus has a movable image carrier for carrying a toner image thereon; an image forming section for forming the toner image on the movable image carrier; a transfer section for electrostatically transferring the toner image on the movable image carrier to a transfer medium at a transfer position; an electrifying section for electrifying the toner image on the movable image carrier before the toner image reaches the transfer position; and a bias applying section for applying a bias to the electrifying section. This image forming apparatus controls the bias output of the bias applying section in accordance with information about surface roughness of the transfer medium.
摘要:
In an image forming apparatus wherein the slip of a transporting belt relative to a driving device due to a change in the surface state the inner surface of the transporting belt and a bad image can be reliably prevented, and having a photosensitive drum on the surface of which a toner image is formed, a transfer belt and a driving roller for driving the transfer belt, wherein the toner image formed on the surface of the photosensitive drum is transferred onto the transfer belt or a recording material borne on the transfer belt, an abrasive roller is provided at a position, in contact with a surface on which the driving roller abuts against the transfer belt.
摘要:
An image forming apparatus includes a transparent image forming device for forming a transparent toner image on a sheet with a transparent toner in an amount per unit area; a manual selector for selecting an image area in which the transparent toner image is to be formed and for selecting the amount per unit area; a heating device for heating the transparent toner image formed on the sheet; a glossing device for processing the transparent toner image formed on the sheet so that glossiness is higher than that by the heating device; a mode selector for selecting a first mode in which the glossing device is not used and a second mode in which the glossing device is used; and a controlling device for controlling the amount per unit area of the transparent toner in the image area so as to be not less than a predetermined amount in the second mode.
摘要:
A glossy image forming system for forming a glossy image on a recording material having a surface resin material layer, the glossy image forming system includes a fixing device for fixing an unfixed toner image formed on a surface of the recording material; a heaterless pressing device for pressing the recording material having the toner image fixed by the fixing device; a smoothing device for smoothing the surface of the recording material pressed by the heaterless pressing device with a pressure smaller than a pressure applied by the heaterless pressing device.