Abstract: This invention relates to a card-reversing device for use with a card printer to perform printing on both sides of a card. According to the present invention, the card-reversing device includes a transmission unit capable of feeding the card, a rotary mean capable of turning the card upside down, a friction medium providing rotation torque for the rotary mean and a lock unit capable of controlling the rotation of the rotary mean. In addition, the card-reversing device of the invention is capable of turning over a card without damage as the turnover operation is abnormally stopped, and it possesses simple, easily assembled and inexpensive properties.

Abstract: This invention relates to a donor web positioning apparatus and method of a thermal color printer with a thermal print head defining a print line and adapted to thermally transfer colored dye from a dye donor web onto a dye receiver medium. The donor web positioning apparatus of the present invention includes a web drive, a sensing device and a controller. The web drive is adapted to deliver the dye donor web consisting of a plurality of colored dye frames for thermal print. The sensing device generates a digital code according to the light intensity of transmission of light beams through the donor web for identifying the leading edge and color of a frame located at the print line. According to the digital code, the controller controls the motion of the web drive for precisely positioning the dye donor web related to the thermal print head.