Dainippon Screen Mfg. Co., Ltd.

Screen Holdings Co., Ltd.

Yoshitomo Wada

Seiya Nomura

Hiroshi Okamoto

Osamu Morizono

Shiro Kitawaki

Tomoyasu Okushima

Katsuki Fukuyama

A rotary encoder correcting method for a transport apparatus having a rotary encoder for outputting output signals in response to rotation of a transport roller. The method includes the steps of setting beforehand the number of n-divided output signals obtained by dividing, by n, the number of output signals outputted from the rotary encoder with one rotation of the transport roller; measuring a divided area shift time for each divided area when a printing medium is transported at constant speed and each time the number of output signals agrees with the number of n-divided output signals; and calculating a correction coefficient for each divided area based on the divided area shift time. The divided area shift time is corrected for each divided area of the rotary encoder based on each correction coefficient when a process is carried out on the printing medium.

Rotary encoder correcting method for a transport apparatus, and a transport apparatus using same

An image forming apparatus for forming an appropriate test pattern is provided. A control sectionincludes: an image combination sectionfor combining image information corresponding to a subject image Pof a first resolution, with second pattern information which corresponds to a test pattern Pof a second resolution different from the first resolution, and which represents image information of the first resolution, so as to generate combined image information as one piece of image information; and an operation instruction sectionfor instructing a recording head, a head driving section, and a medium driving sectionto form, on a recording medium, the combined image information corresponding to one piece of image information.

Image forming apparatus and image forming method

Punchesof puncherstoeach punch a plate P lying immediately thereunder to form a notch. Then, stopper pinsof the punchersandabut with the deepest portion of the notch, such that the plate P is further inserted. The punchesof the punchersandeach punch the plate P lying immediately thereunder to form a deeper notch. In other words, the puncheris capable of forming notches of different depths along one end face of the plate P, whereby it is possible to realize various methods for positioning the plate P on the recording drumin a suitable manner.

Image recording apparatus including a plurality of notch forming sections

An image recording apparatus includes a recording drum rotatable with a printing plate mounted peripherally thereof, a recording head for recording an image on the printing plate mounted on the recording drum, a rotary encoder for detecting a rotation angle of the recording drum, a first and a second sensors for detecting the printing plate mounted on the recording drum, a detection range setting circuit for setting a range of detection of the first and second sensors with respect to the rotation angle of the recording drum according to information on the material of the printing plate, information on reflectance of the printing plate and the presence or absence and the type of positioning holes formed in the printing plate, and a determining circuit for determining a position of an edge of the printing plate mounted on the recording drum, by fetching signals from the first and second sensors based on the rotation angle of the recording drum and the range of detection set by the detection range setting circuit.

Growing community of inventors

Kyoto, Japan

Yoshitomo Wada