Hitachi Koki Co., Ltd.

Hitachi, Ltd.

Akira Igarashi

Masao Miyasaka

Hideki Tanaka

Takashi Yoshida

Fumio Takeda

Toshio Hiki

Hiroshi Takahagi

Yoshikazu Ishitsuka

Nobuhiko Itoh

Mitsugu Asano

Tsutomu Omine

Hiroshi Nishimura

A thermal printer wherein a sheet of recording paper is interposed between two drums provided on axially opposite sides of a shaft of a platen roll facing a line-type thermal head and an endless belt mounted on outer peripheries of the drum. One way clutches provided on a shaft of the drum will cause the paper to rotate together with the drums during recording and the recording paper is driven by the endless belt during paper feed and delivery operations to slide relative to the drums. The sheet of paper is fed to a lower portion of an open portion of the drums and is removed from an upper portion of the open portion of the drums so that the feed and delivery of the sheet of paper can be effected upon rotation of the drums in one direction, and the printing operation is started after a detection of a trailing end of the sheet of paper so that the printing operation can be reformed regardless of the length of the sheet of paper immediately after the feed of the sheet of paper.

Multicolor thermal printer recording medium transmission mechanism

A paper tension adjusting device in which one of the tractors with feeding pins changing feeding apertures in the paper is movable widthwise to adjust widthwise paper tension. The desired tension is determined from paper thickness which is in turn determined from the hammer flight time. Lengthwise tension is adjusted by adjusting paper clampers separated from the tractors. The tension is both widthwise and lengthwise directions is determined by optically sensing the positions of the feeding pin with respect to the aperture in which that pin is engaged.

Paper tension adjusting device and method for a printer

Growing community of inventors

Katsuta, Japan

Akira Igarashi