摘要:
The apparatus comprises a projection optical system and a copying system. The projection optical system can project an image of an original either onto a screen or to an exposing position of the copying system by switching between two positions. The copying system comprises a plurality of chargers providing different charging conditions in accordance with the types and sizes of copy sheets, by utilizing a change-over switch. A plurality of switches adapted for use with copy sheets of different lengths are arranged along the path of movement of a sheet of paper and, when the switch corresponding to the particular length of copy sheet desired is actuated, the movement of the sheet of paper is stopped, so that the central portion of the copy sheet can be brought into alignment with the optical axis for exposing at all times regardless of the difference in the length of copy sheets. Apparatus can interchangeably mount either a pressing plate assembly for manually feeding one original after another or an automatic feed device which can automatically feed one by one a plurality of originals to the exposing position of the copying system and to eject the same therefrom. By switching between the charging conditions of the chargers, it is possible to produce a positive duplicate of an original irrespective of whether the original is negative or positive. The pressing plate assembly and automatic feed device comprise carriers for effecting moving in X-and Y-directions which are interchangeable, so that it is possible to select a carrier which best suits the size of an original and the amount of movement of the original. The projection optical system comprises a blind coupled to a reflector so as to prevent light from the screen from reaching the exposing position of the copying system, the reflecting surface automatically facing downwardly when the power source is turned off.
摘要:
A charge roller rotatable in contact with a photoconductive element in the form of a drum or a belt and applied with a voltage for charging the element, and an image forming apparatus using the same. The surface of the charge roller is ground in order to remove toner particles and other impurities firmly deposited thereon, as needed. The charge roller is capable of uniformly charging the photoconductive element at all times.
摘要:
In the roller charging apparatus according to the present invention, the charging roller includes a layer of an epichlorohydrin rubber, so that it is possible to eliminate electric nonuniformity of a conductive elastic layer and to be charged by loading only a DC voltage. The charging roller also may have a surface layer formed of polyamide resin or fluorine resin. In addition durability can be improved by setting the roller hardness of the charging roller to 42 (measured by a JISA hardness meter) or more. Further, a roller diameter D.sub.r of the charging roller and drum diameter D.sub.d of the photosensitive drum may satisfy the relation of D.sub.d /D.sub.r .gtoreq.4. A cleaner can also be provided for removing foreign materials, such as toner, from the charging roller, and the cleaner may have a rubber hardness less than that of the charging roller.
摘要:
A continuous plural page copying method for a copier determines the size and lengthwise direction of a document which is laid on a glass platen, and produces magnifications on the basis of a relationship between one half of the size of the document in the lengthwise direction and the size of the papers selected. Consecutive pages of the document are reproduced continuously with no regard to the orientation of the document on the glass platen relative to the scanning direction of a scanner. The method reproduces an image on a paper while desirably matching it to the size of the paper.
摘要:
An electrophotographic image forming apparatus using a charge roller for uniformly charging the surface of a photoconductive element, or image carrier, during image formation, and a charging device having the charge roller. The charging efficiency is enhanced, and a uniform charge distribution is set up by the application of a DC voltage only. This suppresses the increase in the cost of an apparatus, the increase in power source cost, and the generation of a great amount of ozone. As a result, a charging member and a photoconductive element are prevented from being deteriorated while environmental pollution is eliminated.
摘要:
In a charging device included in an image forming apparatus for charging an image carrier uniformly, a charge roller has an elastic layer and a surface layer. The elastic layer is made of a substance having a medium electric resistance and having no conductive particles dispersed therein. The surface layer is made of a non-adhering substance having a greater non-adhering property than the substance constituting the elastic layer.
摘要:
A composite ceramic body and a method thereof are provided. The composite ceramic body comprising a first bonding body comprising a ceramic containing Si ingredient, and a second bonding body bonded to the first bonding body through a bonding material containing, as main ingredient, a Si compound which includes the element common to the Si ingredient contained in the first bonding body. The first and second bonding bodies can be bonded strongly and uniformly without any adhesive. Since the composite ceramic body has high bonding strength, it is applicable to microchemical chips and reformers.
摘要:
A composite ceramic body and a method thereof are provided. The composite ceramic body comprising a first bonding body comprising a ceramic containing Si ingredient, and a second bonding body bonded to the first bonding body through a bonding material containing, as main ingredient, a Si compound which includes the element common to the Si ingredient contained in the first bonding body. The first and second bonding bodies can be bonded strongly and uniformly without any adhesive. Since the composite ceramic body has high bonding strength, it is applicable to microchemical chips and reformers.
摘要:
There is provided by the present invention an electrifying roller having a roller layer having at least two layers of an elastic layer provided on a peripheral surface of core metal and a surface layer covering the elastic layer, wherein a slope (.DELTA.I/.DELTA.V) of the V-I characteristics of the roller layer is 1 or less, the electrifying roller is rotated in contact with the light-sensing drum, a voltage is loaded from a power supply unit to the core metal of the electrifying roller, and a surface of the light-sensing drum is electrified to a surface potential (Vs).
摘要翻译:本发明提供了一种带电辊,其具有至少两层设置在芯金属的外围表面上的弹性层的辊层和覆盖该弹性层的表面层,其中斜率(DELTA I / DELTA V) 所述辊层的VI特性为1以下,所述带电辊与所述感光鼓接触地旋转,从电源单元向所述带电辊的芯金属加载电压, 感光鼓通电到表面电位(Vs)。
摘要:
An electrophotographic image forming apparatus using a charge roller for uniformly charging the surface of a photoconductive element, or image carrier, during image formation, and a charging device having the charge roller. The charging efficiency is enhanced, and a uniform charge distribution is set up by the application of a DC voltage only. This suppresses the increase in the cost of an apparatus, the increase in power source cost, and the generation of a great amount of ozone. As a result, a charging member and a photoconductive element are prevented from being deteriorated while environmental pollution is eliminated.