Abstract: A developing device for a copier is controlled such that if the rate at which toner is supplied into its developing tank is detected to exceed a preset reference value, stirring rollers for stirring the toner inside the developing tank are caused to rotate at a slower rate than if the toner supply rate is detected to be less than the reference value such that toner can be charged sufficiently in spite of its increased rate of supply and an image of good quality can be obtained.

Abstract: An image forming apparatus, in which a separation charger for separating from a photosensitive member a paper, when no paper exists between the photosensitive member and the separation charger, is applied with AC voltage, with DC voltage of reverse polarity to the charge polarity of the photosensitive member superposed thereon, thereby preventing the occurrence of paper size memory phenomenon or filming phenomenon.

Abstract: A reproduction apparatus includes a mechanism for transporting a web carrying electrostatically held toner images through an endless path. The web includes a plurality of closely spaced perforations along an edge. A transfer device includes a drum for presenting a receiving surface to the web to receive a plurality of images in registery, for example, color separation images that will make up a multicolor image on the receiving surface. The transfer drum is driven through a gear train by a sprocket which engages the perforations. The sprocket may also drive the web. To assure the most accurate registry despite inaccuracies in the gear train or perforation location, the pitch of the images on the web divided by the circumference of the sprocket is an integer, preferably 1 and preferably, the circumference of the sprocket divided by the circumference of each of the gears in the gear train is an integer.

Abstract: A multi-image reproduction apparatus, for example a multicolor electrophotographic apparatus exposes consecutive image areas on a web, develops them and transfers them in registry to the receiving surface. Exposure is accomplished by flash illumination triggered by sensing indicia on the web. To assure point-to-point registration at transfer an adjustable delay is inserted in the flash actuation circuit. The delay is adjustable for one image area independently of the delay of the other image areas.

Abstract: A device for developing electrostatic images includes a toner supply chamber for holding a supply of dry toner and a feed member located generally at the bottom of the supply chamber. To break up agglomeration of toner in the supply chamber an agitator, for example an elongated polypropylene fiber brush, is placed on top of the feed member and is supported totally at its periphery by the feed member and associated walls of the supply chamber. As the feed member rotates, the agitator is rotated to maintain the toner in particulate form.

Abstract: The present invention relates to a device for guiding a paper toward a transfer region disposed in the vicinity of a sensitive member. A lower guide comprises at least two elastic members, the at least two elastic members being adapted to change elastic modulus depending upon a rigidity of the paper being conveyed toward the sensitive member, whereby the paper can be guided toward the sensitive member under the best condition, regardless of the quality of the paper.

Abstract: Tri-Level Highlight color imaging apparatus and cleaner apparatus therefor. Improved cleaning of a charge retentive surface is accomplished through matching the triboelectric properties of the positive and negative toners and their associated carriers as well as the carrier used in the magnetic brush cleaner apparatus. The carrier in the cleaner upon interaction with the two toners causes them to charge to the same polarity. The carrier used in the cleaner is identical to the one use in the positive developer. The carrier of the negative developer was chosen so that the toner mixed therewith charged negatively in the developer housing.Thus, the combination of toners and carriers is such that one of the toners charges positively against both carriers and the other of the toners charges negatively against one of the carriers and positively against the other.

Abstract: A sheet stripping and guide assembly, suitable for use at the exit of an electrostatographic fusing station has lower stripper fingers that are inserted and molded integrally into a frame having upper sheet guide members.