A reading unit is configured to capture an image of a shadow generated at a leading end of a document, and a control unit is configured to estimate a thickness of the document based on a pixel value of the shadow. A multifeeding error is displayed on a display unit when it is determined as thin paper in a thick paper determination. The control unit turns multifeeding detection to OFF and stands by until a feeding is completed, and upon completion, returns the multifeeding detection to ON.

An image reading apparatus includes an image sensor, a document feeder, and a processor. The document feeder includes a first driving device, a second driving device, a third driving device, a first sensor, and a second sensor. The first driving device includes a pick-up member to move documents from a tray to a document conveying path using a driving force through a first clutch. The second driving device is to move the tray with the documents to a side of the pick-up member using a driving force through a second clutch. The third driving device to move the documents along the document conveying path onto the image sensor using the driving force of the motor The first and second sensors detect the documents on the document conveying path. The processor controls an operation of the first clutch based on the signals of the first and second sensors.

An image reading apparatus includes an image sensor, a document feeder, and a processor. The document feeder includes a first driving device, a second driving device, a third driving device, a first sensor, and a second sensor. The first driving device includes a pick-up member to move documents from a tray to a document conveying path using a driving force through a first clutch. The second driving device is to move the tray with the documents to a side of the pick-up member using a driving force through a second clutch. The third driving device to move the documents along the document conveying path onto the image sensor using the driving force of the motor The first and second sensors detect the documents on the document conveying path. The processor controls an operation of the first clutch based on the signals of the first and second sensors.

A document reader includes a reading unit that reads an image of a document medium, a second driving roller pair that nips and transports the document medium downstream of a read-enabling position of the reading unit, and a control unit that controls rotation of the second driving roller pair. The control unit stops the rotation of the second driving roller pair in a state in which the document medium is not positioned in the read-enabling position and in a state in which the document medium is nipped by the second driving roller pair.

An apparatus including: a forming unit configured to form a measurement image on a sheet; a fixing unit configured to fix the measurement image; a measurement unit provided downstream of the fixing unit in a sheet conveyance direction and configured to measure a color of the fixed measurement image; a detector configured to detect whether a cooling device having a cooling function valid is connected between the fixing unit and the measurement unit; and a controller configured to determine, in a case in which the color of the measurement image is measured, a time to be taken after the sheet has passed through the fixing unit until the measurement unit starts measuring the color of the measurement image based on a result of the detector, and to control sheet conveyance based on the determined time.

A machine learning device according to an embodiment may include: a state variable acquisition unit that acquires first and second state variable datasets including print results performed at first and second printing speeds respectively by an image formation apparatus; a teaching data acquisition unit that acquires first and second teaching data corresponding to the first and second printing speeds; and a learned model generation unit that generates a first learned model by performing machine learning based on the first state variable dataset and the first teaching data, and generates a second learned model by performing machine learning based on the second state variable dataset and the second teaching data. Each of the first and second state variable datasets includes: feature value information; medium information; and first control information. Each of the first and second teaching data includes: second control information; and a print defect value.

A document reader includes a reading unit that reads an image of a document medium, a second driving roller pair that nips and transports the document medium downstream of a read-enabling position of the reading unit, and a control unit that controls rotation of the second driving roller pair. The control unit stops the rotation of the second driving roller pair in a state in which the document medium is not positioned in the read-enabling position and in a state in which the document medium is nipped by the second driving roller pair.

A non-transitory computer readable medium storing computer readable instructions configured to, when executed by a processor of a computer, cause the processor to: receive preparation instruction information from an information processing terminal, in response to receiving the preparation instruction information, cause an operating unit to execute at least one pre-printing operation of which operation content accords with a particular execution condition indicated by particular condition information in the preparation instruction information, receive print instruction information from the information processing terminal, the print instruction information instructing execution of the printing operation according to an execution condition, in response to receiving the print instruction information, determine whether the at least one pre-printing operation has already been executed; and in response to determining that the at least one pre-printing operation has been executed, cause the operating unit to execute the printing operation indicated by the print instruction information.

An image reading apparatus includes a reading unit, a transport unit that transport a document, a feeding unit that transports the document to the transport unit, a controller that stops the feeding operation of the feeding unit after the leading end of the preceding document transported from the feeding unit reaches the transport unit and restarts the feeding operation after the rear end of the preceding document passes a predetermined position. The controller, restarts the feeding operation a first time after the rear end of the succeeding document following the preceding document passes the predetermined position when a size of the preceding document indicates a first size, and restarts the feeding operation a second time after the rear end of the succeeding document passes the predetermined position where the second time is longer than the first time when the size indicates a second size larger than the first size.

An image reading apparatus includes an image sensor, a document feeder, and a processor. The document feeder includes a first driving device, a second driving device, a third driving device, a first sensor, and a second sensor. The first driving device includes a pick-up member to move documents from a tray to a document conveying path using a driving force through a first clutch. The second driving device is to move the tray with the documents to a side of the pick-up member using a driving force through a second clutch. The third driving device to move the documents along the document conveying path onto the image sensor using the driving force of the motor The first and second sensors detect the documents on the document conveying path. The processor controls an operation of the first clutch based on the signals of the first and second sensors.