Abstract: A transferring guide device usable with an image reading sensor unit of a scanning apparatus includes a guide holder installed at the image reading sensor unit and a guide rail installed at a scanning apparatus body. The guide holder slide-contacts the guide rail, and slide contact surfaces on which the guide holder contacts the guide rail are plane. The guide holder point-contacts or line-contacts the guide rail, and as a result, a friction force between the guide holder and the guide rail is weak.

Abstract: A print medium feeding apparatus, comprising: a knockup plate on which a ream of print medium is stacked thereon; a pickup roller for picking up a sheet of print medium stacked on the knockup plate; a sheet separation member installed in a manner to form a contact nip with the pickup roller, and supplying friction force for separating the print medium sheet by sheet; and a friction pad disposed at an upper side of the sheet separation member, being in front of the contact nip. The print medium feeding apparatus of the present invention features an improved paper feeding capacity in that variable friction force is applied for separating printing medium. Moreover, since the friction pad does not come in contact with the pickup roller, the abrasion rate of the friction pad is much reduced. Furthermore, the material cost can be reduced by reducing the size of the friction pad.

Abstract: A print medium feeding apparatus, comprising: a knockup plate on which a ream of print medium is stacked thereon; a pickup roller for picking up a sheet of print medium stacked on the knockup plate; a sheet separation member installed in a manner to form a contact nip with the pickup roller, and supplying friction force for separating the print medium sheet by sheet; and a friction pad disposed at an upper side of the sheet separation member, being in front of the contact nip. The print medium feeding apparatus of the present invention features an improved paper feeding capacity in that variable friction force is applied for separating printing medium. Moreover, since the friction pad does not come in contact with the pickup roller, the abrasion rate of the friction pad is much reduced. Furthermore, the material cost can be reduced by reducing the size of the friction pad.

Abstract: A manual paper feeding device for use with an image forming apparatus, which includes first and second paper trays for storing paper, the first and second paper trays being formed in parallel to each other up and down with a predetermined space therebetween in a body frame of the image forming apparatus; a pickup roller for picking up the paper stacked in the first and second paper trays, the pickup roller being set up to be rotatable in the body frame; a friction pad for separating the paper sheet by sheet, the friction pad being set up in the lower part of the pickup roller; and a paper feeding guide for guiding the feeding of the paper, the paper feeding guide being positioned between the back of paper and the friction pad, when the paper is fed to the image forming apparatus.

Abstract: A transferring guide device usable with an image reading sensor unit of a scanning apparatus includes a guide holder installed at the image reading sensor unit and a guide rail installed at a scanning apparatus body. The guide holder slide-contacts the guide rail, and slide contact surfaces on which the guide holder contacts the guide rail are plane. The guide holder point-contacts or line-contacts the guide rail, and as a result, a friction force between the guide holder and the guide rail is weak.

Abstract: A paper cassette for an image forming apparatus includes a cassette body, a pair of aligning plates, paper separating fingers, and a biasing member. The cassette body has a knock-up plate on which paper is stackable. The pair of aligning plates are disposed on the paper cassette body and moving in a widthwise direction for aligning paper stacked on the knock-up plate in the widthwise direction. The paper separating fingers are disposed on the aligning plates and are vertically movable to a predetermined distance above the aligning plates, for pressing against two corners of a leading edge of an uppermost sheet of paper stacked on the knock-up plate. The biasing member is connected to at least a side of one of the paper separating fingers, for increasing a relative downward pressure exerted by the paper separating finger on the uppermost sheet of paper stacked on the knock up plate.

Abstract: A paper transferring device for an image forming apparatus includes a plurality of guide members forming a paper transferring path connecting a paper feeding device and a photosensitive drum, a feeding roller disposed on a side of the paper transferring path adjacent to the photosensitive drum, the feeding roller transferring a paper incoming along the paper transferring path to the photosensitive drum, at least one transferring roller disposed on the paper transferring path between the feeding roller and the paper feeding device, the transferring roller transferring the paper picked-up from the paper feeding device to the feeding roller, and a paper leading edge aligning unit for aligning a leading edge of the paper so that the leading edge of the paper is parallel to a rotation axis of the feeding roller prior to entering the feeding roller to prevent the paper from being skewed.

Abstract: A paper cassette for an image forming apparatus includes a cassette body, a pair of aligning plates, paper separating fingers, and a biasing member. The cassette body has a knock-up plate on which paper is stackable. The pair of aligning plates are disposed on the paper cassette body and moving in a widthwise direction for aligning paper stacked on the knock-up plate in the widthwise direction. The paper separating fingers are disposed on the aligning plates and are vertically movable to a predetermined distance above the aligning plates, for pressing against two corners of a leading edge of an uppermost sheet of paper stacked on the knock-up plate. The biasing member is connected to at least a side of one of the paper separating fingers, for increasing a relative downward pressure exerted by the paper separating finger on the uppermost sheet of paper stacked on the knock up plate.

Abstract: A paper transferring device for an image forming apparatus includes a plurality of guide members forming a paper transferring path connecting a paper feeding device and a photosensitive drum, a feeding roller disposed on a side of the paper transferring path adjacent to the photosensitive drum, the feeding roller transferring a paper incoming along the paper transferring path to the photosensitive drum, at least one transferring roller disposed on the paper transferring path between the feeding roller and the paper feeding device, the transferring roller transferring the paper picked-up from the paper feeding device to the feeding roller, and a paper leading edge aligning unit for aligning a leading edge of the paper so that the leading edge of the paper is parallel to a rotation axis of the feeding roller prior to entering the feeding roller to prevent the paper from being skewed.

Abstract: A method and apparatus for removing remaining toner from an image forming apparatus, when a non developing time is detected during a performing of printing, a supply voltage applied to a supplying roller is increased to a level higher than a developing voltage applied to a developing roller. When the supplying roller having the supplying voltage of a voltage level higher than the developing voltage is in contact with the developing roller, electric flux is directed from the supplying voltage having a high electric potential to the developing voltage having a low electric potential due to a difference of intensities of electric fields between the supplying roller and the developing roller, while toner having negative charge moves from the developing roller to the supplying roller in a reverse direction to that of the direction of the electric flux to remove the remaining toner.

Abstract: A roller control device is provided that both sets sheets for printing and feeds them into an electrophotographic apparatus. The roller control device is may be constructed using a pickup roller that is mounted on a central axle and is used for feeding sheets of paper from a paper tray into an electrophotographic apparatus. A disk may be installed on the central axle between the pickup gear and the pickup roller. A solenoid may be mounted to the housing of the apparatus underneath the disk to modulate the movement of the disk using a latch that is interposed between the disk and the solenoid. A cam is installed on the central axle between the disk and the pickup roller to slidably contact a lift plate to set sheets of paper. The roller control device is usable in a compact apparatus, is economical to manufacture, and is easy to repair and maintain.

Abstract: A device for feeding toner of a laser beam printer includes a plurality of minute feeding holes formed in a toner hopper and supplying toner therethrough, an agitator installed in the toner hopper and rotated to stir the toner to be supplied through the feeding holes; and a toner disintegrating member shaken by the rotation of the agitator, supplying a limited amount of toner and giving a limited amount of the toner stained on a feeding roller.

Abstract: An electrophotographic development system preventive of a rolling of paper on a photosensitive drum includes a charging roller for charging the surface of the photosensitive drum with high voltage by a rotation with the photosensitive drum, an exposure unit for producing an electrostatic latent image on the charged part of the photosensitive drum, a developing roller having a thin and uniform toner layer through which the latent image on the photosensitive drum passes to be developed into a visible image, and a transfer roller for transferring the image on a paper, whereby to compulsorily separate the paper rolling up the photosensitive drum.