Abstract: The apparatus for feeding recording paper according to the present invention includes a platen roller gear, a white roller gear, a forwardly/reversely rotatable motor, a gear train connected to the motor, a relay mechanism for transmitting a force from the gear train to the platen roller gear and white roller gear, and a switching mechanism. The relay mechanism has a driving gear constantly meshed with an output gear of the gear train, and a first driven gear constantly meshed with the driving gear and being capable of revolving around the gear. The relay mechanism has a second driven gear constantly meshed with the driving gear and being capable of revolving around the gear. The relay mechanism has a third driven gear constantly meshed with the first driven gear and being capable of revolving around the first driven gear. The switching mechanism stops movement of the first driven gear and releases the stop of movement.

Abstract: An apparatus for maintaining an electrophotographic apparatus with at least a photosensitive member comprises a first memory for storing a count value for the number of prints, and a second memory for storing the number of replacements of the first memory when the count value for the number of prints has reached a value based on which a decision is made whether the service life of the photosensitive member is expired. When it is determined that the value stored in the second memory has reached a predetermined value, a user is informed of the maintenance period of other maintenance-requiring components than the photosensitive member.

Abstract: A filter case having open opposite ends is disposed with one of the open ends thereof facing an air exit formed in the side wall of the housing of an electrophotographic apparatus, and a filter element holding frame having an upper opening through which an ozone filter element is inserted therein is supported pivotally at its lower end on the lower portion of the filter case for turning about a substantially horizontal axis so as to be fitted in the filter case. In changing the ozone filter element, the cover is opened, the filter element holding frame is turned about the substantially horizontal axis to expose the upper opening thereof outside the filter case so that the ozone filter element can be taken out through the upper opening from the filter element holding frame. The wide, open upper space in the housing facilitates the filter element changing operation.

Abstract: A postobjective optical deflector comprising: a polygonal optical deflector (polygonal rotating mirror) having a plurality of convex reflecting surfaces each being curved surface other than a spherical surface or a portion of a cylindrical surface; and a pseudocylindrical lens disposed between the polygonal optical deflector and an objective surface, having a cylindrical surface having its power in the feed direction or a rotationally symmetric surface rotationally symmetric with respect to an axis of rotational symmetry parallel to the scanning direction, and a curved surface represented by a polynomical of even degree and having its power in the scanning direction. The combined performance of the correcting effects of the polygonal optical deflector and the pseudocylindrical lens corrects the curvature of image surfaces and f.theta. characteristics at a high accuracy.

Abstract: The present invention provides an electrophotographic apparatus comprising a housing containing a sheet transportation path, a transfer unit and a fixing unit, and having an open upper surface, a top cover holding an exposure unit and pivotally joined to the housing so as to cover the open upper surface of the housing, an image forming unit comprising a photoconductive drum and a charger, and a developing unit having a toner container. The image forming unit is supported on supporting members provided in the developing unit, and both the image forming unit and the developing unit are held by holding members provided in the housing. The developing unit is provided with upwardly projecting handles.

Abstract: A high voltage power supply controller includes a plurality of high voltage transformers, and causes the high voltage transformers to generate high voltages upon switching operations of corresponding switching transistors, to there by apply the high voltages to loads.

Abstract: A commodity data reader comprises a bar-code scanner disposed near the edge of one of the longer sides of an elongated check-out counter on which baskets containing commodities are placed on the side of the operator with the scanning window thereof facing the customer. Commodities are passed for scanning across the scanning window before the customer's eyes. Also, the check-out counter may be provided with a body support for supporting the operator in the belly, to thereby alleviate any fatigue which may be felt by the operator.

Abstract: A method of producing an ink-jet type printer head wherein a plurality of plate-shaped piezoelectric members are stuck onto the surface of a low-rigidity member so that they are disposed adjacent to the low-rigidity member. A plurality of grooves extending from the surfaces of the piezoelectric members to the inside of the low-rigidity member are defined by grinding in parallel at given intervals inclusive of positions at which the grooves extend through joints between the adjacent piezoelectric members. In addition, posts are formed on both sides of each of the grooves and electrodes are disposed on both inner sides of each groove. A roof is stuck on the surfaces of the piezoelectric members so as to define a plurality of pressure chambers having one end in which a plurality of nozzles are formed.

Abstract: A paper feeder comprises a paper pick up mechanism, feeding rollers for receiving the paper supplied from the pick up mechanism and transporting the paper to an image transfer position for a toner image formed on a photosensitive drum and rotated along with the photosensitive drum, a stepping motor for driving the photosensitive drum and the feeding rollers, and drive pulse generator for sequentially generating drive pulses to be supplied to the stepping motor. The paper feeder further comprises a paper feeding controller for controlling the operation of the paper pick up mechanism in accordance with the number of the drive pulses generated from the drive pulse generator.

Abstract: The present invention provides an ink supplying device for a printing press provided with a master cylinder (7), including an ink supply roller (41) comprising a cylindrical core member (51) internally defining an ink chamber (53) for containing ink, a cylindrical ink-absorbing member (52) formed on the cylindrical core member. The ink-absorbing member (52) is impregnated with the ink contained in the ink chamber (53) by a capillary action. The ink is transferred from the ink-absorbing member (52) through mixing rollers (43, 44) and an inking roller (46) to a master paper (2) wound around the master cylinder (7) of the printing press in an ink film of uniform thickness.

Abstract: An electrophotographic printing apparatus comprises an electrifying unit for electrifying a surface of a photosensitive drum, an exposing unit for selectively exposing the photosensitive drum to form an electrostatic latent image, a developing unit for developing the electrostatic latent image, a transferring unit for transferring the developed image to a paper sheet, a deelectrifying unit for removing unnecessary charges left on the surface of the photosensitive drum after the image transfer, thereby enabling the surface to be electrified again.

Abstract: A label printer includes a body frame and a separating device for separating printed lables from a base. The separating device is detachably mounted on first and second mounting shafts attached to the body frame. The separating device includes a supporting shaft, a pair of supporting members mounted on the opposite end portions of the supporting shaft, and a pair of hook members rotatably mounted on the supporting shaft. Each supporting member has a supporting surface and a engaging recess. The first mounting shaft is removably fitted to the engaging recesses so that the supporting members are rotatable about the first mounting shaft between an off position and a holding position wherein each supporting surface contacts the second mounting shaft so that the supporting member is held between the mounting shafts. Each hook member has a hook portion which engages the second mounting portion to lock the supporting member in its hold position.

Abstract: A printer includes an outer case housing a printing head and a platen and being provided with a paper sheet introducing opening. A paper sheet introducing guide is mounted on the outer case to guide a paper sheet introduced into the introducing opening to a position adjacent to the platen. A paper sheet intermediate guide is mounted within the outer case to guide the paper sheet from the distal end of the introducing guide to a gap between the platen and the printing head. A paper sheet auxiliary guide extends from the intermediate guide to the upper surface of the distal end portion of the introducing guide.

Abstract: According to the present invention, a printer mechanism housing portion which houses a printer mechanism therein and has a paper insertion opening formed in the upper surface thereof is provided, and a flat terminal loading base is provided continuously to the lower side faces of the printer mechanism housing portion. The flat terminal loading base having a paper insertion passage in the interior thereof and also having a terminal loading surface as an upper surface. The paper insertion opening and the paper insertion passage being connected with each other in a curved form through a paper guide passage, whereby the space efficiency is enhanced to permit the reduction in size of the entire system.

Abstract: A paper width of a sheet of paper is input into a paper width setting section. In case of defining a non-print area at a fore end of the paper, a paper bail roller is manually separated from a platen to output a detection signal A from a paper bail switch. In this case, a paper feeding motor is controlled to be driven by a control device, thereby feeding the paper until the fore end of the paper reaches the paper bail roller. On the other hand, in case of starting printing from the fore end of the paper, an operating section is operated to output a command signal B therefrom.

Abstract: A sheet delivering mechanism guides sheets of different sizes fed from sheet feed units along a sheet guide passage including electrographic printing mechanism for printing, delivers printed sheets of different sizes to sheet receiving trays of corresponding sizes, respectively, by switching guide fingers between different guide positions according to the size of the printed sheet, so that the printed sheets are sorted by size and the printed sheets of the same size are delivered to the corresponding sheet receiving tray. The smaller sheet receiving trays for the smaller printed sheets are disposed above the larger sheet receiving trays for the larger printed sheets to facilitate taking out the printed sheets from the sheet receiving trays.

Abstract: An optical scanning system is constructed in a compact construction by attaching a light deflecting member to one end of the output shaft of a motor internally having a space for containing parts, forming an optical path extending through the space in the output shaft of the motor between a semiconductor laser and the light deflecting member, and providing at least a collimator lens in the space for containing parts. A meniscus lens, i.e., a correcting optical system, having a concave surface of a radius of curvature in the range of 8 to 20 mm is disposed with its concave surface facing the light deflecting member so that the distance between the reflecting point on the light deflecting member and the optical center of the concave surface is in the range of 5 to 10 mm to limit the curvatures of image field with respect to the scanning direction and with respect to the feed direction of the scanning light beam are limited to a very small degree.

Abstract: An apparatus for inputting commodity data including a bar code scanner having a reading window on a front surface thereof, a keyboard for inputting the commodity data which keyboard is supported at an upper portion of the bar code scanner, and a supporting member for rotatably supporting the bar code scanner in such a manner that the bar code scanner can be rotated about a horizontal pivotal axis. The bar code scanner can be rotated according to the kind of a commodity or the height of a cashier. Accordingly, a bar code of the commodity can be placed to a laser beam scanning area by the cashier in a natural posture, and can be read by the bar code scanner reliably and easily.

Abstract: An offset printing machine having a blanket sheet wrapped around an outer circumferential surface of a blanket cylinder 3 so as to come in contact with a master and having clamps 29 and 30 for releasably retaining opposite ends of the blanket sheet to the blanket cylinder 3. After ending a printing operation, the blanket sheet is removed from the clamps 29 and 30 and dumped. Accordingly, the cleaning of the blanket cylinder 3 can be omitted to prevent hands and clothes from being stained.

Abstract: A label printer comprises a supporting frame having a pair of side plates facing each other. A print head and a platen roller are arranged between the side plates. Above the print head is arranged a ribbon supply device for running a transfer ribbon between the print head and the platen roller. The ribbon supply device includes a ribbon drive section, and a ribbon unit supported on a supporting member and movable between a first position wherein the unit engages the drive section and a second position wherein the unit is located outside the supporting frame. A fixing member is attached to one of the side plates and movable between a release position wherein the fixing member allows the ribbon unit to move and a fixing position wherein the fixing means engages the ribbon unit to hold it in the first position.