Korea Institute of Machinery & Materials

Jeongdai Jo

Taik Min Lee

Dong Soo Kim

Seung-hyun Lee

Dongwoo Kang

Kwang-Young Kim

Young Man Choi

Chung Hwan Kim

Deokkyun Yoon

Yunseok Jang

Byung Oh Choi

Dong Youn Shin

A method of measuring feeding velocity of a web, on which a scale having pitches different from pitches of a mask are formed, is provided. The method includes: calculating a number of vibrations of a moir&#xe9; image of light passing through the mask and the scale; calculating pitches of the scale of the fed web based on the calculated number of vibrations of the moir&#xe9; image; averaging the pitches of the scale so that a change in a pitch between adjacent timings among the calculated pitches of the scale is minimized; extracting first signals corresponding to our phases for one pitch based on the averaged pitches of the scale; calculating two second signals for forming a Lissajous circle from the first signals; and calculating an angle of the Lissajous circle by the two second signals and then calculating the feeding velocity of the web by using the calculated angle.

Apparatus and method of measuring web feeding velocity by using single field encoder

A printing apparatus having an automatic printing sheet feeder integrated thereto to improve mass productivity. The printing apparatus includes a base, a moving stage, an automatic printing sheet feeder, and a printing roll. The moving stage is linearly movable along the base, and has a lithographic plate seated on the top surface thereof, the lithographic plate having a printing pattern thereon. The automatic printing sheet feeder is installed on the moving stage. The automatic printing sheet feeder includes an unwinding roll, which supplies the printing sheet, a rewinding roll, which collects the printing sheet, and a plurality of guide rolls, which guide the printing sheet to pass through the printing area of the moving stage. The printing roll is installed on the base, and performs printing by transferring ink from recesses of a printing pattern of the lithographic plate to the printing sheet on the moving stage.

Printing apparatus having automatic printing sheet feeder

Growing community of inventors

Daejeon, South Korea

Jeongdai Jo