摘要:
A charging device includes a corona charger, provided with an opening opposing a photosensitive member, for electrically charging the photosensitive member; a sheet-like member provided so that the sheet-like member can cover the opening; a movable device for moving the sheet-like member; and a regulating device for regulating a shape of the sheet-like member so that a central portion of the sheet-like member protrudes toward the corona charger with respect to a circumferential direction of the photosensitive member.
摘要:
An image forming apparatus includes an image bearing member, charging device which is in contact with the image bearing member and charges the image bearing member, development device which forms a toner image on the image bearing member and recovers a residual toner remaining after the transfer from the image bearing member, transfer device which transfers the toner image on the image bearing member onto a transfer material, auxiliary charging device which is positioned at a downstream side of the transfer device and at an upstream side of the charging device in a rotating direction of the image bearing member, which is in contact with the image bearing member and which is given a voltage of a polarity opposite to that of the developing toner, and voltage selecting device which selects the voltage applied to the auxiliary charging device based on the potential of the image bearing member after the transfer. In this manner, it is possible to prevent a defective image resulting from a voltage applied to the auxiliary charging device, regardless of a fluctuation of the potential on the photosensitive member after the transfer.
摘要:
An image forming apparatus of the present invention is composed by an image bearing member that bears a toner image; an intermediate transferring material that contacts with the image bearing member; a transferring unit that transfers a toner image on the image bearing member to the intermediate transferring material at a transferring position; a bias applying unit that applies a bias to a power supply portion of the transferring unit during a period in which transfer is performed by the transferring unit; a cleaning unit that contacts with the image bearing member and cleans the surface of the image bearing member; a toner supplying unit that, when an image is not being formed, passes a toner image for supply that is formed on the image bearing member through the transferring position to supply the toner image for supply to the cleaning unit; and a switching unit that switches from a state in which the power supply portion is electrically connected to the bias applying unit to a state in which a resistance value between the power supply portion and a ground is 100 MΩ or more.
摘要:
The present invention provides a charging device which can suppress the deterioration of a photosensitive member and the occurrence of an image deletion phenomenon on an electrophotographic image due to an electric discharge product having deposited on a charger shutter, even when having been used for a long period of time. The charging device has an image bearing member which bears an image thereon, a charging member which charges the image bearing member, and a shielding member which shields the charging member from the image bearing member, wherein the shielding member includes a specific material.
摘要:
An image forming apparatus for forming an image with developing toner on an exposed portion has a mode in which a toner image is automatically output onto a recording material without using exposure by an exposure device. When an inclination adjustment of a corona charging device is performed using an output image on the recoding material, the image forming apparatus can output an image for adjusting the inclination of the charging device that is not affected by variation of an exposing light amount of the exposure device.
摘要:
A charging device includes a corona charger, provided with an opening opposing a photosensitive member, for electrically charging the photosensitive member; a sheet-like member provided so that the sheet-like member can cover the opening; a movable device for moving the sheet-like member; and a regulating device for regulating a shape of the sheet-like member so that a central portion of the sheet-like member protrudes toward the corona charger with respect to a circumferential direction of the photosensitive member.
摘要:
A charging device includes a corona charger for electrically charging a photosensitive member; a sheet-like member for covering and uncovering an opening of the corona charger; regulating device for regulating a shape of the sheet-like member so that a central portion of the sheet-like member protrudes toward the corona charger with respect to a widthwise direction of the sheet-like member; and a winding-up device for winding up the sheet-like member such a surface of said sheet-like member as is remote from the photosensitive member is inside.
摘要:
In the image forming apparatus, in ending an image forming operation, a bias voltage having an opposite polarity from the transfer bias voltage is applied to the primary transfer device when at least a region passes through the primary transfer portion, the region passing through the development portion in a state in which the development bias voltage is applied in an uncharged region in the surface of the image bearing member after a charging operation of the charging device is stopped.
摘要:
An image forming apparatus includes a plurality of image forming stations and a transferring device. Each image forming station includes an image carrier for carrying an electrostatic image and a developing device for developing the electrostatic image with toner. The transferring device transfers toner images formed by the plurality of image forming stations to a transferring medium. The plurality of image forming stations include a transparent image forming station using transparent toner and color image forming stations using, for example, yellow, magenta, cyan, and black toners, respectively. The transparent image forming station includes a cleaning device that is in contact with the image carrier and picks up residual toner on the image carrier. The developing devices of the color image forming stations develop electrostatic images on the corresponding image carriers and simultaneously pick up residual toners on the corresponding image carriers.
摘要:
An image forming apparatus includes a plurality of image forming stations and a transferring device. Each image forming station includes an image carrier for carrying an electrostatic image and a developing device for developing the electrostatic image with toner. The transferring device transfers toner images formed by the plurality of image forming stations to a transferring medium. The plurality of image forming stations include a transparent image forming station using transparent toner and color image forming stations using, for example, yellow, magenta, cyan, and black toners, respectively. The transparent image forming station includes a cleaning device that is in contact with the image carrier and picks up residual toner on the image carrier. The developing devices of the color image forming stations develop electrostatic images on the corresponding image carriers and simultaneously pick up residual toners on the corresponding image carriers.