Abstract:
In a device for developing electrostatic images with developer mix including magnetic carrier particles and triboelectrically charged toner particles which comprises a container for the developer mix, magnetic field producing means and an applicator enclosing the magnetic field producing means, a magnetic brush forming means is provided in the container for applying toner particles substantially uniformly to a surface to be developed, and a toner powder-cloud forming means is provided in spaced apart relationship with the magnetic brush forming means for applying toner particles to the same surface by the use of the edge effect of the toner powder.
Abstract:
An automatic original feeding apparatus has a coordinates position detecting device provided with a supporting table for supporting thereon a sheet original of which the area during image formation is to be designated, a conveying device for directing the inserted sheet original to a predetermined position, and a feed device provided upstream of the conveying device and responsive to the termination of the area designation to change over to a feeding position and feed the sheet original on the supporting table to the conveying device.
Abstract:
In a developing device adapted to be removably mounted with respect to an image forming apparatus, there are provided protective cover members for covering and protecting a developing sleeve for developing a latent image on an image bearing member and spacer rollers for maintaining the gap between the image bearing member and the developing sleeve at a predetermined distance. Opening-closing of these protective cover members is effected in response to operation of a member such as a handle which is capable of being drawn out with respect to the developing device.
Abstract:
An image forming apparatus such as a copying apparatus and a laser beam printer, is capable of forming a superimposed image or duplex image on one sheet. The sheet which has been once subjected to the image forming operation and which is going to be subjected to another image forming operation is reintroduced into the image forming station selectively through a flow-through sheet passage or through an intermediate tray on which the transfer sheets are once stacked. A displaceable flapper is provided to direct the sheet selectively to the flow-through passage or to the intermediate tray.
Abstract:
Apparatus for cleaning an image carrier in an image forming device has a cleaning member, support structure for supporting the cleaning member in such manner as to make the cleaning member contact the image carrier and pressing members engageable with the outer and inner surfaces of the image carrier to grasp it.
Abstract:
This specification discloses an invention relating to the relationship between a latent image bearing member such as screen-like photosensitive medium and a corona discharger used to form a latent image on the latent image bearing member. More particularly, the corona discharger is divided into a plurality of dischargers so that when the sum of the length of the corona discharger for the formation of the latent image and the length of the latent image bearing member is greater than the length in the direction of movement of an endless support member supporting the latent image bearing member, the plurality of dischargers may selectively discharge corona in accordance with the rotational position of the latent image bearing member. By this, the latent image bearing member may be prevented from being dually charged and the length of the latent image bearing member may be minimized to contribute to reduction in size of the image formation apparatus.
Abstract:
An image forming apparatus includes an image bearing member, image forming station for forming a latent image on the image bearing member, a conveying passage extending toward the image bearing member to guide a developing device, a first moving mechanism for engaging with the developing device in the conveying passage and moving it in a substantially horizontal plane, wherein the image bearing member, the latent image forming station, the conveying passage and the first moving mechanism are provided in a main body of the image forming apparatus, a device for accommodating a plurality of developing devices. The accommodating device is mounted to the main body, the accommodating device includes, a second moving mechanism for moving the developing device opposed to the conveying passage into the conveying passage in a substantially horizontal plane and an accommodating case having partition stages arranged substantially vertically for accommodating plural developing devices and movable together with the developing devices accommodated therein, and a driver for transmitting a driving force selectively to the first driving mechanism, the second driving mechanism and the accommodating case.
Abstract:
An image forming apparatus for forming a developed image includes a developing device for developing an image on an image bearing member, a passage along which the developing device is movable continuously between an inside position where the developing device is inside the apparatus and an outside position where the developing device is at least partly outside the apparatus, a driver for automatically moving the developing device along the passage and one or more pressing members for pressing the developing device toward the image bearing member. The driver includes a driving source and transmission which are operative to move the developing device in response to the opening of a cover which covers an inlet to the passage.
Abstract:
An image forming apparatus includes accommodating assembly for accommodating a plurality of developing devices on stages arranged substantially vertically and having first driving mechanism for moving the developing devices in a substantially horizontal plane, an image formation assembly for receiving selected one of the developing devices moved out of the accommodating assembly and for further moving it in a substantially horizontal plane, the image formation assembly including systems for forming images using the developing device, the accommodating assembly further including an opening for allowing a the developing device to be loaded into the accommodating assembly.
Abstract:
An image forming apparatus includes an image forming station for conveying a sheet material along a lateral reference position and for forming an image on the sheet material; refeeding device for refeeding to the image forming station the sheet material on which the image has been formed in the image forming station; means, provided in the sheet refeeding means, for shifting the sheet material in the lateral direction from the lateral reference position by a predetermined amount, wherein the amount of the shift is predetermined on the basis of a change in a lateral dimension of the sheet material resulting from an image forming operation in the image station.