Provided is a transport device including a first transport section that is driven at a first transport speed and transports a recording medium interposed therein, a second transport section that is driven at a speed different from the first transport speed, is located at a downstream of the first transport section in a transport direction, and transports the recording medium interposed therein, a detection section that detects variations in a driving load of the second transport section before and after the recording medium is discharged from the first transport section, and a derivation section that derives a thickness of the recording medium based on the variations.

A medium supplying apparatus includes a control unit. The control unit executes: a first control in which, in a case where a double feed detecting sensor detects a double feed of media, rotation drive of a separator roller is stopped, and a retard roller is caused to convey the media to an upstream side in a conveying direction; and a second control in which, after the execution of the first control, the rotation drive of the separator roller is restarted, and, in a case where the double feed detecting sensor detects a double feed of the media, a conveying load applied is set to be higher than that at the time of detecting the double feed before the execution of the first control, the rotation drive of the separator roller is stopped, and the retard roller is caused to convey the media to the upstream side in the conveying direction.

A sheet processing apparatus, comprising a thickness detecting device, the thickness detecting device including: a plurality of conductive displacement members; a plurality of resonance circuits that are disposed to correspond to the plurality of displacement members, each include a coil facing the corresponding displacement member and a capacitor, and neighboring resonance circuits resonate at different resonance frequencies; and a calculator that calculates a thickness of the sheet based on impedance values of the plurality of resonance circuits and the plurality of displacement members.

A double feed detection sensor unit includes a double feed detection sensor for detecting a document via a hole on a conveyance guide, a control circuit board on which the double feed detection sensor and an element are provided, and a protection member provided to cover the element.

A money handling device for accepting, storing and dispensing valuable documents in exchange for goods or services includes a validation module (100), a recycler module (200) and a note storage module (300). The validation module determines acceptable and non-acceptable valuable documents, and the storage module stores acceptable valuable documents. The recycler is arranged to dispense a temporarily stored valuable document to the validation module for dispensing as change or to dispense a temporarily stored valuable document to the note storage module.

A medium conveyance apparatus including a first unit on one side of a conveyance path of a sheet-shaped medium, a second unit on the other side of the conveyance path and facing the first unit, a guide unit that is provided at the second unit and that contacts the medium between the first and second unit to move the second unit in a direction of separating from the conveyance path, an imaging unit provided at one of the first and second unit, a reference plate whose image can be captured by the imaging unit and that is provided at the other of the first and second unit, and a detecting unit for detecting the medium in the conveyance path, the detecting unit being provided in the conveyance path at an upstream position of a reading position where the imaging unit reads the medium.

A medium transport device includes a first roller pair and an ultrasonic detection section positioned downstream of the first roller pair, wherein the ultrasonic detection section includes a transmission sensor chip configured to emit ultrasonic waves along a first axis, a receiving sensor chip that is configured to receive the ultrasonic waves and that is disposed at a position on the first axis and, a transmission board on which the transmission sensor chip is mounted, a receiving board on which the receiving sensor chip is provided, a first protection member positioned between the transmission sensor chip and the medium, a second protection member positioned between the receiving sensor chip and the medium, a transmission board holder configured to hold the transmission board and the first protection member, and a receiving board holder configured to hold the receiving board and the second protection member.

a medium transport device includes a first roller pair, a second roller pair disposed downstream of the first roller pair, and an ultrasonic detection section disposed between the first roller pair and the second roller pair.

The ultrasonic detection section includes a transmission sensor chip, a receiving sensor chip, a transmission board on which the transmission sensor chip is provided, and a receiving board on which the receiving sensor chip is provided. A first axis is inclined with respect to a surface of the medium passing between the transmission sensor chip and the receiving sensor chip and at least a part of the transmission sensor chip and at least a part of the receiving sensor chip are within a range of the second roller pair in a normal direction with respect to a surface of the medium at a nip position of the second roller pair.

An image forming apparatus as a sheet conveying apparatus comprises a paper feeding roller, an upstream side sensor, and an ultrasonic wave sensor. The paper feeding roller provides a plurality of sheets placed on a document tray in series to a conveying path. The upstream side sensor detects presence or absence of a sheet being conveyed along the conveying path, at a location of a downstream side of the paper feeding roller along the conveying path. The ultrasonic wave sensor detects presence or absence of occurrence of multiple feed, based on intensity of ultrasonic waves received at a location of a downstream side of the upstream side sensor along the conveying path.

A multi-feed detection apparatus for detecting multi-feed of a sheet conveyed along a paper path is provided. The apparatus includes a first movement amount sensor disposed on the paper path to face a first surface of the sheet to detect a movement amount of the sheet; a second movement amount sensor disposed, on the paper path, in a position at which the first movement amount sensor is disposed to face a second surface of the sheet to detect a movement amount of the sheet; and a determination portion configured to determine that a conveyance state of the sheet is multi-feed when a difference between the movement amount of the sheet detected by the first movement amount sensor and the movement amount of the sheet detected by the second movement amount sensor is equal to or greater than a threshold.