Hewlett-packard Development Company, L.p.

Sungdae Kim

Yong-Ho You

Jaeil Yu

Kiho Park

Minkeun Song

SaeJin Park

Sooyong Kim

Youngwan Cho

Yasuhisa Ehara

Sangbum Woo

An image forming apparatus includes a printer engine, a sensor and a processor. The printer engine forms an image. The sensor outputs vibration information associated with a vibration of the printer engine. The processor determines whether at least one component of the printer engine has an abnormality based on the output vibration information.

Abnormality determination for printer engine using vibration information thereof

An example image forming apparatus includes a printing engine including a plurality of photosensitive drums, a motor device to provide a driving force to each of the plurality of photosensitive drums, and a processor to control the printing engine such that printing data is printed on a printing paper and control the motor device such that at least one of the plurality of photosensitive drums operates at a different speed from the other photosensitive drums while the printing data is printed.

Color registration by varying rotational speed of photosensitive drum

Growing community of inventors

Seongnam-si, South Korea

Sungdae Kim