Abstract: A sheet conveying device includes: a sheet housing unit that houses a sheet; a sheet conveying unit that conveys the sheet; a sheet detection unit that detects presence or absence of the sheet in the sheet housing unit; a sheet nipping unit that nips the sheet housed in the sheet housing unit; and a control unit. The control unit controls the sheet nipping unit to reach a nipping state to nip the sheet in the sheet housing unit upon the sheet detection unit detecting a sheet-present state, executes a power saving mode to stop supplying power to at least a part of the electric mechanisms when no drive command is input for a predetermined time, and controls the sheet nipping unit to cancel the nipping state before execution of the power saving mode.

Abstract: An automatic document feeder includes a document stack unit; a conveying unit configured to separate a document from the documents stacked on the document stack unit and convey the document to a scanning position through a conveying path; document detecting units configured to detect the document; an upstream document detecting unit configured to detect the document, the upstream document detecting unit being arranged in the conveying path at an uppermost stream in a document conveying direction with respect to the document detecting units; and a determining unit configured to determine a passage of a trailing end of the document at positions of the document detecting units and the upstream document detecting unit and determine a presence of a hole on the document, based on the detection results. A detection range of the upstream document detecting unit is set to be wider than detection ranges of the document detecting units.

Abstract: A sheet conveying device includes: a sheet housing unit that houses a sheet; a sheet conveying unit that conveys the sheet; a sheet detection unit that detects presence or absence of the sheet in the sheet housing unit; a sheet nipping unit that nips the sheet housed in the sheet housing unit; and a control unit. The control unit controls the sheet nipping unit to reach a nipping state to nip the sheet in the sheet housing unit upon the sheet detection unit detecting a sheet-present state, executes a power saving mode to stop supplying power to at least a part of the electric mechanisms when no drive command is input for a predetermined time, and controls the sheet nipping unit to cancel the nipping state before execution of the power saving mode.

Abstract: There is provided an image-forming apparatus having a transmitting and receiving device for transmitting and receiving system information to a host computer by way of a data communication line; a detection device for detecting the amount of toner deposited on the photoreceptor in the developing unit of the image-forming apparatus; a counting device for counting the number of images to be printed; and a near-full detection device for detecting the near-full state of waste toner by using the detection device and the counting device.

Abstract: There is provided an image-forming apparatus having a transmitting and receiving device for transmitting and receiving system information to a host computer by way of a data communication line; a detection device for detecting the amount of toner deposited on the photoreceptor in the developing unit of the image-forming apparatus; a counting device for counting the number of images to be printed; and a near-full detection device for detecting the near-full state of waste toner by using the detection device and the counting device.