Abstract: A door apparatus used in an electrophotographic image printer includes a door frame mounted on a surface of a main body of the printer and rotatably opened and closed, a pressure-unit fixing bracket attached to an inner side of the door frame, and a buffer unit movably supporting the pressure-unit fixing bracket against the door frame and spaced-apart from the door frame by a certain distance. A plurality of holes are formed on the pressure-unit fixing bracket and receives shafts of components installed in the main body and the shafts are disposed adjacent to the door frame when the door frame is closed. The pressure-unit fixing bracket moves against the door while the shafts are inserted into the holes.

Abstract: A device for measuring the concentration of a developer liquid for a liquid-type printer, including a container having a discharge portion, first and second rotary members rotatably installed in the container with a predetermined space, and a supply portion for supplying the developer liquid containing toner particles and liquid carrier into the space between the first and second rotary members. A concentration detector is provided for detecting the concentration of the developer liquid by emitting light onto the developer liquid flowing along the space between the first and second rotary members, and receiving the light passed through the developer liquid. In the concentration measuring device, the space between the first and second rotary members can be adjusted to be smaller, and the concentration of a developer liquid having a low light transmittance can also be measured.

Abstract: A liquid developer refilling system of a liquid electrophotographic printer for supplying any one of concentrated inks and a carrier to corresponding one of ink storage tanks and a carrier storage tank installed in the printer, and a method thereof. The system includes: a main frame provided with a common installation portion; an auxiliary frame installed to be movable with respect to the main frame; a cartridge installed at the installation portion and provided with a discharge hole through which a concentrated ink or carrier is discharged by compressed air; a fastener for fixing the cartridge installed at the installation portion to the main frame; a valve unit provided with a plurality of valves which can be selectively matched with the discharge hole and installed to be movable with respect to the auxiliary frame; and a valve raising/lowering mechanism which raises or lowers the auxiliary frame with respect to the main frame to connect or disconnect a corresponding valve to or from the discharge hole.

Abstract: In an apparatus for elevating a squeeze roller of a liquid developing apparatus, a sub-block having the squeeze roller selectively pressing a photoreceptor web installed thereon, is installed at a main block of the liquid developing apparatus to be capable of moving up and down. A mobile block is installed at the main block to be capable of moving up and down to support the sub-block. The mobile block is moved up and down by an elevating unit to allow the squeeze roller to contact or be separated from the photoreceptor web. A piezoelectric element is installed at the mobile block to support the sub-block and to move the sub-block up and down in a predetermined range by being reversibly transformed by electric current. A power supply selectively provides electric current to the piezoelectric element. Thus, the decline over time of the elastic force of the spring employed in the conventional elevating apparatus can be fundamentally solved.

Abstract: A photosensitive belt receiving case is provided, which includes a sidewall having a predetermined shape and an outer wall which extends from the edge of the sidewall. A plurality of grooves are formed at opposing sides of a portion of the outer wall combined with the sidewall. An inner wall extending from the sidewall parallel to the outer wall is provided inside the outer wall, and has a plurality of grooves which face the grooves of the outer wall, so that a photosensitive belt is received between the outer and inner walls and the edge of the photosensitive belt is partially exposed through the grooves.

Abstract: An electrophotographic printer includes first and second transcription rollers for printing an image transcribed from a photosensitive drum on a first surface of a paper. The printer further includes third and fourth transcription rollers positioned to one side of the first and second transcription rollers and movable up and down for selectively contacting the photosensitive drum, thereby to print the image transcribed from the photosensitive drum on a second surface of the paper. Accordingly, both surfaces of the paper can be printed by passing a paper through the printer only once.

Abstract: A microwave oven includes a control panel having switches enabling a user to input cooking functions, and a display for displaying data representative of input functions. A transparent display protector overlies the display and is displaceable inwardly toward the display to actuate some of the switches, including an on-off switch. Sections of the protector are movable inwardly relative to one another to actuate respective switches. Springs yieldably bias the protector away from the display.

Abstract: A thermal-transcription printer has a printing head and a platen drum which is moved up and down to press thermally activated ink from a thermal transfer ribbon onto a paper. A lever member is installed on a feed roller for transferring a paper sheet, and the platen drum is supported by an end portion of the lever member. The platen drum moves up and down, while being supported by the lever member which rotates in the same direction as the feed roller, and presses an ink ribbon and the paper against the printing head.

Abstract: A video printer includes a control circuit for outputting an image signal to the printing mechanism from a first memory so that the image signal is printed in a central effective image area. The control circuit also outputs index information (for example, the date or title) to the printing mechanism from a second memory so that the index information is printed in a margin area outside of the central effective area.

Abstract: An image forming apparatus includes a drum gear having a first guide slot and a cam, a clamp having a first interlocking pin inserted into the first guide slot and a cam pin is interlocked with the cam. A release lever is mounted on a support plate on which a shaft of a drum is supported. A lifter having one end with a second guide slot formed therein is coupled to the first interlocking pin. The other end of the lifter has a second interlocking pin interlocked with the release lever. The apparatus can shorten the overall printing time by reducing the additional time required for ejecting a sheet of paper because the clamp is operated in cooperation with rotation of the drum during a printing operation.

Abstract: A paper holder of a video printer for improving an accuracy of a printing cycle by eliminating a position error of color of Y, M and C, and for reducing a printing time by discharging the record paper immediately after a printing cycle is complete.