Canon Kabushiki Kaisha

Kentaro Onuma

Hiromitsu Hirabayashi

Hiroyuki Saito

Haruyuki Yanagi

Tetsuya Ishikawa

Haruo Uchida

Minoru Teshigawara

Kenji Shigeno

Nozomu Nishiberi

Motoyuki Taguchi

Yuichiro Suzuki

Hiroyuki Kakishima

Noriyuki Sugiyama

Koya Iwakura

Shinya Sonoda

Shunya Sunouchi

Koichiro Kawaguchi

Shinji Kanemitsu

Tetsuhiro Nitta

Tadashi Hanabusa

Masaaki Ishihara

Masakazu Tsukuda

Hideo Sugimura

Toshiya Matsumoto

Michiharu Shoji

Yasuyuki Hirai

Nozumu Nishiberi

A printing apparatus is provided which can prevent foreign matters such as ink adhering to the surface of the conveying belt from getting transferred to other constitutional components. When the conveying belt is rotating in one direction, the foreign matters adhering to the surface of the conveying belt is removed by the wiper. When the conveying belt rotates a predetermined distance in the opposite direction, the pinch roller, the electric charge removing roller and the electric charge supply roller that are in contact with the belt surface are disengaged from the surface of the conveying belt. The predetermined distance is set equal to a rotating distance that the conveying belt rotates until a portion of the surface of the conveying belt, which was in contact with the wiper, comes into contact with the pinch roller, the electric charge removing roller and the electric charge supply roller.

Printing apparatus

A recording apparatus has a pair of bearingshaving: two surfacesandwhich support both edge portions of a conveying roller; driven rollerswhich press the conveying rollerin the direction where extension lines of the two surfacesandcross; and further, an intermediate bearingwhich presses the conveying rollerin the direction of a point where the extension lines of the two surfacesandcross.

Recording apparatus

A recording apparatus for forming images using a recording head includes a feeding roller, a conveying roller, a conveyance control unit, and a recording control unit. The conveyance control unit performs a conveying operation a number of times after the trailing end of a sheet reaches a predetermined position defined between the feeding roller and the conveying roller such that the trailing end of the sheet is disposed in a predetermined range upstream of the conveying roller in a sheet conveying direction after the conveying operations. At least one of the conveying operations performed a number of times is performed based on a distance from the position of the trailing end of the sheet to the position of the conveying roller.

Apparatus and method for controlling recording and sheet conveying based on recording scans and sheet position

This invention relates to a printing apparatus and a conveyance control method capable of allowing even an arrangement having a plurality of conveyance rollers in a printing medium conveyance path to accurately control conveyance of a printing medium. According to this invention, a first encoder detects a conveyance amount by a first conveyance roller, provided in a conveyance path, for conveying a printing medium. A second encoder detects a conveyance amount by a second conveyance roller provided in the conveyance path in the conveyance direction of the printing medium at the downstream side of the first conveyance roller for conveying the printing medium. On the other hand, a signal output from the first or second encoder is selected on the basis of the position of the printing medium on the conveyance path. Conveyance of the printing medium is controlled on the basis of the selected output signal.

Printing apparatus and conveyance control method

A conveying apparatus includes a lever swinging in contact with a recording medium conveyed along a conveying path in a conveying direction, a sensor detecting the swinging of the lever, a moving unit for moving the lever from a position where the lever is allowed to contact the recording medium in the conveying path to a position where the lever is retracted from the conveying path, a guide unit being movable between a first position and a second position, the guide unit guiding the recording medium conveyed in a direction opposite to the conveying direction to the conveying path when the guide unit is located in the second position and a transmitting unit for transmitting the movement of the guide unit to the moving unit through motion of at least one member to link the movement of the guide unit from the first position to the second position with the movement of the lever to the position where the lever is retracted from the conveying path, the movement of the lever being performed by the moving unit.

Conveying apparatus and recording apparatus

This invention relates to a printing apparatus and a conveyance control method capable of allowing even an arrangement having a plurality of conveyance rollers in a printing medium conveyance path to accurately control conveyance of a printing medium. A pattern having a predetermined uniform density is printed on a printing medium a plurality of number of times by using a printhead while conveying the printing medium and changing the conveyance amount by a small amount. A conveyance correction amount obtained on the basis of the conveyance amount upon printing a pattern selected from a plurality of printed pattern is stored in a storage medium. Conveyance of the printing medium is controlled while correcting the conveyance amount of the printing medium by the conveyance means on the basis of the conveyance correction amount stored in the storage means.

In order to stabilize a performance of a pump employed for processing in an inkjet printing apparatus such as sucking ink from a printing head with a low cost configuration and without the need of using any specific detecting unit, the following configuration is employed. Namely, a tube pump having a member with a curved surface aligned with a flexible tube for supporting the tube and a roller which moves while pressing (squeezing) the flexible tube is driven with a DC motor. To keep revolutions always constant, a current PWM control is employed for changing a power applied to the motor according to load fluctuations, and a phase of the roller is determined based on the current PWM value to manage a pressure generated by the pump and a discharge rate.

Inkjet printing apparatus and method of controlling an ink suction pump motor

This invention relates to a printing apparatus and a conveyance control method capable of simultaneously operating plural encoder sensors and executing more accurate printing medium conveyance control. A first encoder sensor provided adjacent to a first conveyance roller detects the conveyance amount of a printing medium by the first conveyance roller provided in the conveyance path of the printing medium. A second encoder sensor provided adjacent to a second conveyance roller detects the conveyance amount of the printing medium by the second conveyance roller provided in the conveyance path of the printing medium at the downstream side from the first conveyance roller in the conveyance direction of the printing medium. For example, conveyance of the printing medium is controlled on the basis of the output signals from the first and second encoder sensors when a tail end of the printing medium is located adjacent to the first conveyance roller.

A conveyance apparatus increases the conveyance precision of a conveyance unit. The conveyance apparatus has first and second conveyance rollers. The conveyance apparatus includes a DC motor serving as a driving source for the conveyance rollers, a first encoder which outputs a first pulse signal in accordance with rotation of the first conveyance roller, a second encoder which outputs a second pulse signal in accordance with rotation of the second conveyance roller, and a control unit having a first mode in which the DC motor is controlled based on first information about the first pulse signal when executing a conveyance operation to convey a sheet by using the first and second conveyance rollers, and a second mode in which the DC motor is controlled based on second information about the second pulse signal when executing a conveyance operation to convey a sheet by using the second conveyance roller.

Conveyance apparatus, control method therefor, and printing apparatus

An ink jet printing apparatus that can print high quality images under simple control includes a conveying roller disposed upstream of a printing section to convey a print medium, a pinch roller that rotates in cooperation with the conveying roller and discharging rollers that convey the print medium downstream of the printing section. The pinch roller, before a trailing end of the print medium reaches a nip portion between the conveying roller and the pinch roller, moves from a pressure contact position with respect to the conveying roller. A conveyance amount of the print medium varies between before and after separation of the pinch roller from the conveying roller.

Ink jet printing apparatus and method for controlling ink jet printing apparatus

A conveying roller and a paper expelling roller provided upstream and downstream, respectively, of a recording portion in a conveyance direction are connected via an idler gear so as to be able to perform drive transmission, a rotation drive amount of the idler gear is detected, ends of a recording medium in the conveyance direction are detected, driving of a conveying motor is controlled based on detection signals of the rotation drive amount of the idler gear and the ends of the recording medium, and a control constant is made variable according to a position of the recording medium in the conveyance direction.

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Yokohama, Japan

Kentaro Onuma