Fuji Xerox Co., Ltd.

Kozo Tagawa

Tsutomu Udaka

Yoshiki Matsuzaki

Ryo Ando

Takeshi Kato

Toshiyuki Kazama

Osamu Goto

Hideki Moriya

Susumu Kibayashi

Satoru Nishikawa

Tsuyoshi Sunohara

Hidehiko Yamaguchi

Naoto Nishi

Yoshihiko Mitamura

Koji Morofuji

Junichi Murakami

Norio Hokari

Hiroaki Satoh

Yasuhiro Arai

Hirotaka Mori

Takashi Hoshino

Mitsuaki Kuroda

Kenichi Kawauchi

Shun Yashima

Susumu Yamashina

Kenji Koizumi

Toshio Hisamura

Kazuhiro Hama

Seiichi Takayama

Kohyu Shigemori

Toshiki Matsui

Itaru Sato

Kazuo Takano

A transport monitoring control device includes

Transport monitoring control device and image forming apparatus

A transport monitoring control device includes a transport unit configured to transport a recording medium while nipping the recording medium, a driving unit configured to drive the transport unit, a detector configured to detect a waveform related to a load of the driving unit when the recording medium enters the transport unit or is discharged from the transport unit, and a determining unit configured to determine whether the recording medium is skewed with respect to the transport unit, based on a waveform width at a height obtained by multiplying a peak value of the waveform by a predetermined coefficient.

A device for measuring a length of a recoding material, includes: a rotating body that rotates in contact with a recording material which is transported; a length measuring unit that measures a length of the recording material based on a rotation of the rotating unit; a detecting unit that detects at least one of a rotation and an oblique advance of the recording material; and a correcting unit that corrects a value measured by the length measuring unit based on an output of the detecting unit.

Device for measuring length of recording material, image forming apparatus and computer readable medium

A measuring device of a length of a recording material includes: a rotary unit that rotates while coming into contact with the recording material; a pulse signal output unit that outputs a pulse signal in response to a rotation angle of the rotary unit; first and second detection units that detect the recording material; and a calculation unit that calculates a length of the recording material. The calculation unit calculates a piece of the length of the recording material corresponding to a time below pulse interval of the pulse signal and then calculates the total length in the transport direction of the recording material.

Measuring device of recording medium length, image forming apparatus, and computer readable medium

The image forming apparatus is provided with: a toner image carrying member that moves while carrying a toner image; a transferring member that transfers, on a recording medium, the toner image that the toner image carrying member carries; a transporting unit that transports the recording medium along a transport path that passes through a transfer region where the transferring member transfers the toner image onto the recording medium; and a controller that controls a movement speed of the toner image carrying member. The controller changes the movement speed of the toner image carrying member in accordance with a position, on the transport path, of the recording medium that the transporting unit transports.

Image forming apparatus, control apparatus, computer readable medium and control method to mitigate color shift

An image-forming device which is equipped with an image-holding member, an exposure section provided with plural light-emitting portions arranged in a first direction, a movement section that relatively moves the exposure section and the image-holding member in a second direction that intersects with the first direction, and a light-emission control section. The light-emission control section causes the plural light-emitting portions to periodically emit light in accordance with image data representing an image that is to be formed on the image-holding member, to form the image on the image-holding member. The light-emission control section varies a light-emission period during formation of the image, so as to correct for periodic fluctuations within the image of at least one of density and magnification ratio in the second direction.

Image formation device and method for correcting periodic variations

An image forming apparatus has: a recording head having plural unit recording heads divided in a direction orthogonal to a moving direction of a recording medium; a detecting section detecting at least offset of an image recorded by a vicinity of an end portion, in the direction orthogonal to the moving direction of the recording medium, of the plural unit recording heads; and a correcting section correcting recording offset of the recording head on the basis of results of detection of the detecting section.

Image forming apparatus

Provided is an inkjet recording device that has a conveying unit for conveying a recording medium, plural recording head groups each structured by plural unit heads disposed along the conveying direction, and an ink receiving unit for receiving ink discharged from the unit heads. The recording head groups, correspond respectively to plural individual recording regions which are sectioned off in the recording medium transverse direction which is orthogonal to the conveying direction, are disposed so as to be at respectively different positions at adjacent individual recording regions along the conveying direction. The ink receiving unit is disposed so as to face ink drop discharging surfaces of the unit heads. The conveying unit is plural conveying belts disposed at positions evading trajectories of the ink drops from the unit heads as seen in a direction of a line normal to the recording medium so as to be divided in the conveying direction.

Inkjet recording device and inkjet recording method

An image forming apparatus has a plurality of image forming units for forming images in various colors, and transfers images formed by these image forming units onto a transfer belt an overlapping manner. The image forming apparatus includes a control unit for outputting a predetermined control signal in order to form a color-shift detecting pattern with respect to the transfer belt by employing a plurality of these image forming units, and a pattern detecting sensor for reading the color-shift detecting pattern formed on the transfer belt by this control unit. Under normal operation, the control unit controls forming operation of color-shift detecting patterns by using only commonly-used color image forming units, while the control unit does not form a color-shift detecting pattern by using a specific-color image forming unit.

Image forming apparatus and color-shift control method

An image-forming apparatus adjusts the running state of a belt by displacing one of the rolls supporting an endless belt, wherein the roll is displaced to prevent the belt from being twisted by a change in the tension of the endless belt that stems from the operation for displacing the roll. When the image-forming apparatus is provided with a belt running adjusting mechanism,which adjusts the running state of the endless belt,by displacing one (drive roll,) of plural rolls supporting the belt,in the adjusting directions J, K, there is provided a tension correction mechanism,which corrects a change in the tension of the endless belt,that is caused by the operation of the belt running adjusting mechanism,for displacing the roll,, by displacing, in the correction directions L, M, a contact member (tension roll,) which is in contact with the belt,along the direction of width thereof.

Method and apparatus for correcting running state and tension for an endless belt in an image-forming apparatus

A registration pattern is formed on an intermediate transfer belt by using one photosensitive body. Pattern parts transferred onto the intermediate transfer belt vary in spacing due to speed variation occurring at the transfer time. The passing timing of the registration pattern is read through a read section placed downstream from the photosensitive body and speed (position) variation is sensed. The sense data is gotten over several cycles of the intermediate transfer belt and a low-frequency component caused by thickness unevenness of the intermediate transfer belt is extracted. The extracted data is subjected to the effects of variations at both the formation time and read time of the registration pattern and thus is corrected of calculating true speed (position) variation data. For example, a drive roll is controlled based on the data and an image is formed.

Image formation system including an intermediate transfer belt and

An imperfect register correcting method is applied to correcting the incorrect disposition and functions of the components of a multicolor image forming apparatus which forms a multicolor image by sequentially superposing color images formed by a plurality of image forming units thereof, causing imperfect register of the color images formed by the plurality of image forming units. The imperfect register correcting method comprises a first imperfect register correcting cycle in which skews of the image forming units are corrected, and a second imperfect register correcting cycle in which factors of imperfect register other than the skews are corrected. The second imperfect correcting cycle is carried out subsequent to the first imperfect register correcting cycle to obviate the introduction of errors into data for correcting the factors of imperfect register by the correction of the skew of the image forming units.

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Kanagawa, Japan

Kozo Tagawa