摘要:
The heat and pressure rolls of a fusing apparatus for an electrophotographic copying machine are shifted into pressure contact with one another while a support sheet bearing a toner powder image passes therebetween, and are separated while the sheet is not therebetween. A driving mechanism drives both rolls when not in contact, while one of the rolls drives the other while in pressure contact. A shifting mechanism is actuated by a sheet detector for shifting the rolls into and out of contact.In another embodiment, the rolls are in light rolling contact, with no sheet passing therebetween, under the weight of one of the rolls idly mounted in place. A pressing mechanism presses the rolls into pressure contact, upon actuation by a sheet detector, while the sheet passes between the rolls.
摘要:
An electrophotographic copying apparatus in which a photoreceptor, a developing device and a cleaning device for residual toner particles are integrally incorporated in a casing as one unit so as to be releasably inserted into the copying apparatus housing for efficient replacement and maintenance of such major components. The copying apparatus is further provided with a copy paper sheet feed device which can be changed over from manual sheet insertion to automatic sheet feeding or vice versa by simply one operation.
摘要:
In a dry-type developing apparatus for use in electrophotography including a developing sleeve for conveying a two-component developer composed of a toner and a carrier to a developing station, an automatic toner replenishing device comprises a roller to which voltage is applied having recessed toner dispenser portions and a toner recovering peripheral surface portion on its periphery and rotatable in contact with a portion of the developer on the sleeve after the developer portion has passed through the developing station, bias voltage sources connected to the sleeve and to the roller respectively to produce a potential difference between the sleeve and the roller, and a toner tank arranged to cover part of the roller and containing the toner to be replenished.
摘要:
The heat and pressure rolls of a fusing apparatus for an electrophotographic copying machine are shifted into pressure contact with one another while a support sheet bearing a toner powder image passes therebetween, and are separated while the sheet is not therebetween. A driving mechanism drives both rolls when not in contact, while one of the rolls drives the other while in pressure contact. A shifting mechanism is actuated by a sheet detector for shifting the rolls into and out of contact.In another embodiment, the rolls are in light rolling contact, with no sheet passing therebetween, under the weight of one of the rolls idly mounted in place. A pressing mechanism presses the rolls into pressure contact, upon actuation by a sheet detector, while the sheet passes between the rolls.
摘要:
Devices for controlling the heating of fuser roll apparatus are disclosed. In fuser roll apparatus a toner powder image is heated under pressure on a supporting sheet to be fixed thereon. The apparatus comprises a plurality of heaters for heating a fuser roll; and a plurality of surface temperature detecting elements for detecting the surface temperature of the fuser roll, the power to the respective heaters being independently controlled according to detecting signals from the respective surface temperature detecting elements.
摘要:
An electrophotographic copying apparatus which is equipped with an improved arrangement for removing jammed copy paper. The apparatus is provided with a photoreceptor and a developing device combined into one unit which can be withdrawn to provide sufficient space for removing jammed copy paper, and is also provided with copy paper transporting members, a corona charger, a transfer charger, a copy paper separating claw etc. which can be moved away from a transfer section in one operation for facilitating access to the jammed copy paper in an efficient manner in the case of copy paper jamming. The transfer charger is covered when it is moved away from the transfer section to protect it from possible damage.
摘要:
In an electrophotographic copying machine having a transparent support for support thereon the original to be copied, an illumination device for illuminating the original on the transparent support and a photoreceptor surface adapted to be driven past charging, exposure, developing, transfer and cleaning stations, a discharging device for extinguishing unnecessary electrostatic charge on the photoreceptor surface which is formed at an area between each two adjacent areas to be optically exposed to the incoming light, which discharging device has at least one light guide having one end situated adjacent an intercepting mechanism and the other end situated in the vicinity of the photoreceptor surface. The intercepting mechanism is brought into operation to intercept passage of discharging light towards the photoreceptor surface.
摘要:
An optical illumination device for use in a copying apparatus of the type wherein an object is to be illuminated and an image thereof is to be projected through a particular image transmitter formed of a plurality of optical fibers of graded refractive index in bundled configuration to a light sensitive surface, comprises a source of illumination light and a light guide duct of substantially flattened cubic body. The light guide duct is designed such that rays of light from the light source accommodated within the light guide duct are directed towards a curved reflective surface and subsequently converge at one point on the transparent support structure for the support of the original to be copied thereon to form a strip or ribbon of light available for illumination of the original to be copied.
摘要:
A paper feeder for feeding a large supply of paper to a recording apparatus such as a copying machine. The recording apparatus has a main body with a driving apparatus therein, an automatic feed mechanism therein including paper storage cassettes and an automatic feed for feeding recording paper from the cassettes, and a manual feed for feeding into the apparatus recording paper manually inserted thereinto. The paper feeder has a recording paper accommodating unit for accommodating a larger number of sheets of recording paper than the cassettes, the unit having a sheet feeder for feeding the recording paper out of the unit, and releasable engaging hooks for removably attaching the unit to the main body with the feed positioned in a position opposed to said manual feed of the apparatus for delivering sheets of recording paper to the manual feed. The apparatus drive is connected to the sheet feeder when the unit is attached to the main body, whereby when the unit is attached to the main body with a multiplicity of sheets of recording paper accommodated therein, the sheets can be fed to the interior of the apparatus through the manual feed.
摘要:
The present invention is a projection device for a photocopying machine in which the original documents are moved during the photocopying process and which permits photocopying both of thick and of thin original documents. The projection means includes a focussing means which has a short focal length and is positioned to correctly focus the image of thin original documents which are brought to an exposure station and are only separated space-wise from the focussing means onto a photosensitive material, and a transparent block which, when a thick original document is copied, is automatically interposed between the focussing means and the exposure station and compensates the deviation in the path of image-wise light caused by the transparent carrier on which the thick original document is supported, whereby good resolution is achieved in photocopies of all types of original documents.