Samsung Electronics Co., Ltd.

Kyung-pyo Kang

Hyoung-il Kim

Hyoung-Il Kim

Yong-duk Lee

Dong-hun Han

Hyun-il Kim

Myung-bo Son

Dac-hycok Im

Hyoung-It Kim

Yong-sung Choi

A transfer belt driving controller includes an idle roller that is installed on a rotating shaft of one of a plurality of supporting rollers in such a way that the idle roller may freely rotate, and is wrapped and rotated by a transfer belt, where the plurality of supporting rollers are arranged in the transfer belt and to be a predetermined distance apart from each other; an encoder wheel that rotates with the idle roller; an encoder that detects information regarding rotation of the encoder wheel; and a control unit that controls a linear velocity of the transfer belt by feedback controlling a driving source for driving the supporting rollers based on the information regarding rotation of the encoder wheel detected by the encoder.

Transfer belt driving controller and electrophotographic image forming apparatus having the same

An image scanning device includes a main body casing, a scanning unit which is movably disposed within the main body casing, and a position indicating unit to generate position information of the scanning unit, and to wirelessly receive and display the position information.

Image scanning device and multifunction apparatus having the same

A driving apparatus includes a driving gear bidirectionally rotatable by a driving source, at least two driven gears selectively driven by the driving gear, at least two swing gears connected to the driving gear to operate in combination with the driving gear and to transmit a driving force of the driving gear to the driven gears, a swing lever pivotally disposed to support the swing gears, and an adjusting unit to adjust a swing position of the swing lever.

Driving apparatus and image forming device having the same

A print alignment error between a first printhead of a first ink cartridge and a second printhead of a second ink cartridge installed in an inkjet printer is calibrated by printing preset test patterns on a paper according to an input correction signal using the first and second printheads, scanning the printed test patterns, measuring positions of a starting point and an end point of each of the scanned test patterns, calculating a horizontal print alignment error between the first and second printheads from the starting points, calculating a vertical print alignment error between the first and second printheads from the starting points and the end points, and calibrating the calculated horizontal and vertical print alignment errors.

Method of calibrating print alignment error

A thermal printer and a printing method are provided. The thermal printer includes a thermal printhead for applying a predetermined amount of heat to a thermal recording paper to develop a print layer provided on the thermal recording paper; a feeding roller for feeding the thermal recording paper, a platen roller for facing the thermal printhead to support the thermal recording paper, wherein the thermal recording paper passes between the thermal printhead and the platen roller, a first encoder sensor for detecting a rotation of the platen roller, a second encoder sensor for detecting rotation of the feeding roller; a counting unit for counting first and second pulse signals generated from the first and second encoder sensors, respectively, and a switching unit of the first and second pulse signals as a variable to control the feeding of the thermal recording paper.

Thermal printer and printing method

An apparatus for processing a signal output by an encoder, including a frequency multiplication unit to repeatedly multiply each of frequencies of two sinusoidal signals with a phase difference of approximately 90 degrees by a predetermined number a predetermined number of times; a converter to convert each pair of the two frequency-multiplied sinusoidal signals into square wave signals; and a processor to receive the square wave signals and count a number of rising and/or falling edges of the square wave signals in order to determine and control a position of an object to be controlled.

Method and apparatus for processing the output signal of an encoder

An image aligning method for a thermal imaging device includes picking up a thermal imaging medium that has a first surface and a second surface on which printing operations may be performed respectively from a medium container. An edge of the medium is fed a first distance from a heating element of a thermal printhead to a printing path. An image is formed on the first surface of the medium while proceeding the medium through the printing path. The thermal printhead is rotated to face the thermal printhead toward the second surface of the medium. The edge of the medium is fed the first distance from the heating element. An image is formed on the second surface of the medium while feeding the medium through the printing path.

Image aligning method for thermal imaging printer

A method for printing on a thermal medium by aligning test patterns comprises the steps of feeding a thermal medium to a print starting position of the medium beyond a predetermined distance from a heating elements of a thermal printhead; printing a first test pattern when a front edge of the medium is detected by an edge detection sensor; measuring a first distance between the front edge and the first test pattern by detecting the first test pattern using the edge detection sensor; rotating the thermal printhead to face the second surface; feeding the thermal medium to the print starting position of the medium is beyond predetermined distance the thermal printhead; printing a predetermined second test pattern when the front edge of the medium is detected by the edge detection sensor while feeding the medium; and measuring a second distance between the front edge and the second test pattern.

Method of printing thermal media by aligning image

An apparatus and method are provided for reducing a printing position error, in which the method includes the steps of (a) driving an encoder wheel as many times as a predetermined number of forward counts at a predetermined initial acceleration, thereby making the edge of a printing paper become separated from a sensing unit and conveyed in a forward direction, (b) driving the encoder wheel at the predetermined initial acceleration and conveying the printing paper in a backward direction, (c) calculating a difference value between the number of backward counts of the encoder wheel from a start time of the backward driving to a point when the sensing unit detects the edge of the printing paper and the number of forward counts, and (d) repeating the steps (a) through (c) for a designated number of times while varying the predetermined initial acceleration, and setting an initial acceleration corresponding to a smallest value among the difference values as the initial acceleration for driving the encoder wheel. Therefore, in the case of separately printing data on one printing paper several times, the resolution of a printed image can be improved by reducing the printing position error.

Method for reducing printing position error and image forming apparatus using the same

A method of compensating a sheet feeding error in an ink-jet printer includes printing a test pattern on the sheet; scanning the printed test pattern using the image sensor and measuring a distance Wbetween a starting point Xand an ending point Xof the test pattern; driving the feeding roller and moving the sheet to a set distance Hso that the set distance His shorter than a length of the test pattern in a sheet feeding direction; scanning the test pattern using the image sensor and measuring a distance Wbetween a starting point Xand an ending point Xof the test pattern; calculating a distance H, along which the sheet is actually fed, from a difference between the distances Wand W; calculating a feeding error E of the sheet from a difference between the feeding distance H and the set distance H; and compensating for the sheet feeding error E at the set distance H.

Method of compensating sheet feeding errors in ink-jet printer

A method of driving a step motor is provided which uses different operations of driving the step motor according to the driving speed of the driver, including a micro step operation for a low speed section of the driver and a full step operation for a high speed section of the driver. The method reduces low speed vibration and high speed noise caused by switching pulse noise. Moreover, driving the step motor by the full step operation in the high speed section reduces the frequency of use of a central processing unit (CPU), thereby stabilizing the driving device. In addition, only a small number of reduction gears is required, reducing the size of the driving device.

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Suwon-si, South Korea

Kyung-pyo Kang