Canon Kabushiki Kaisha

Noboru Hada

Yuki Igarashi

Masato Eiyama

Yuichi Naoi

Keiji Harada

Norio Sugiyama

Shunsuke Akari

A sheet feeding device includes a drive unit that rotates a roll of a wound sheet in a first direction and in a second direction, a sensor having an output which changes according to a distance between a detecting position facing a peripheral surface of the roll and the peripheral surface of the roll, and a control unit that determines an amplification factor of the sensor on the basis of data. The data is acquired by changing the amplification factor while the roll is rotated once in the second direction and includes a plurality of the output values acquired at different rotation angles.

Sheet feeding device and printing apparatus

A printing apparatus includes a first roller that nips and conveys, in a conveyance direction, a printing medium, a second roller that nips and conveys the printing medium at a downstream side of the first roller in the conveyance direction, a print unit that prints an image on the printing medium conveyed by the second roller, and a control unit that, until printing by the print unit reaches a vicinity of a trailing end of a print length, sets a nip pressure of the first roller to a first pressure, and when printing by the print unit reaches the vicinity of the trailing end of the print length, sets the nip pressure of the first roller to a second pressure that is higher than the first pressure.

Printing apparatus and conveyance control method thereof

The technique of the present disclosure has an object to perform PWM control of DC motors with a CPU and a motor drive circuit connected by a smaller number of serial interfaces, and provides a motor drive circuit comprising: energization control units to switch the directions of energization of motors by using switching elements to be driven by PWM signals; a reception unit to receive data indicating energization of the motor and the duty ratio of the PWM signal for each energization control unit from a computation apparatus by serial communication; a first signal generation unit to generate a motor control signal for controlling energization of the motor and the duty ratio based on the data for each energization control unit; and a second signal generation unit to generate the PWM signal having the duty ratio set according to the corresponding motor control signal for each energization control unit.

Growing community of inventors

Kawasaki, Japan

Noboru Hada