A recording device includes: a transport unit configured to transport a medium in a plurality of transport speed modes; a driving unit configured to drive the transport unit with a plurality of speed profiles, each corresponding to one of the plurality of transport speed modes; a current sensor configured to measure a reference current the driving unit, the reference current being a current flowing in the driving unit when the medium is transported in a loosened state; and a control configured to acquire a plurality of current profiles, each corresponding to one of the speed profiles, based on the reference current. The control unit is configured to acquire a first current profile based on the reference current when the medium is transported in a first transport speed mode, and to generate a second current profile based on the first current profile.

A recording device includes: a transport unit configured to transport a medium in a plurality of transport speed modes; a driving unit configured to drive the transport unit with a plurality of speed profiles, each corresponding to one of the plurality of transport speed modes; a current sensor configured to measure a reference current the driving unit, the reference current being a current flowing in the driving unit when the medium is transported in a loosened state; and a control configured to acquire a plurality of current profiles, each corresponding to one of the speed profiles, based on the reference current. The control unit is configured to acquire a first current profile based on the reference current when the medium is transported in a first transport speed mode, and to generate a second current profile based on the first current profile.

A medium conveying apparatus includes a feed roller, a brake roller, a motor to generate a driving force, a first transmission mechanism to transmit the driving force to the brake roller through a first torque limiter, to rotate the brake roller in a direction opposite to a medium feeding direction, a second transmission mechanism to transmit the driving force to the brake roller through a second torque limiter, bypassing the first torque limiter, to rotate the brake roller in the direction opposite to the medium feeding direction, and a processor to detect media multi-feed, and perform control in such a way as to transmit the driving force to the brake roller by the second transmission mechanism and also cause the feed roller to be driven to rotate in the direction opposite to the medium feeding direction by the brake roller, when the media multi-feed is detected.

A medium conveying apparatus includes a feed roller, a brake roller, a motor to generate a driving force, a first transmission mechanism to transmit the driving force to the brake roller through a first torque limiter, to rotate the brake roller in a direction opposite to a medium feeding direction, a second transmission mechanism to transmit the driving force to the brake roller through a second torque limiter, bypassing the first torque limiter, to rotate the brake roller in the direction opposite to the medium feeding direction, and a processor to detect media multi-feed, and perform control in such a way as to transmit the driving force to the brake roller by the second transmission mechanism and also cause the feed roller to be driven to rotate in the direction opposite to the medium feeding direction by the brake roller, when the media multi-feed is detected.

A sheet conveying device includes a sheet pickup body, a first sheet conveyor, and a second sheet conveyor, which are disposed in this order along a sheet conveyance direction, and circuitry. The first sheet conveyor includes a first sheet feed roller, a second sheet feed roller, and a first motor. The second sheet conveyor includes a conveyance roller and a second motor. The circuitry is configured to determine a sheet conveyance state of a sheet based on at least one of torque of the first motor of the first sheet conveyor and torque of the second motor of the second sheet conveyor. The first sheet conveyor is configured to interpose the sheet between the first sheet feed roller and the second sheet feed roller and convey the sheet to the second sheet conveyor as the first sheet feed roller rotates.

A conveyance mechanism capable of attaining high conveyance performance and protecting a conveyance object and a mechanism itself, a medium processing device and a conveyance method using the conveyance mechanism are provided to solve the problem. The conveyance mechanism includes a conveyance passage which is a passage where a conveyance object is conveyed, a conveyance member moving the conveyance object along the conveyance passage, a motor driving the conveyance member, a control part controlling an output torque of the motor, a conveyance state identifying means identifying a conveyance state that is a position and/or a conveyance direction of the conveyance object in the conveyance passage, and a storage part which upper limit torque information which is an upper limit value of an output torque allowable for the motor or a parameter value required for calculation of the upper limit value is registered for each type of the conveyance state.

A conveyance mechanism capable of attaining high conveyance performance and protecting a conveyance object and a mechanism itself, a medium processing device and a conveyance method using the conveyance mechanism are provided to solve the problem. The conveyance mechanism includes a conveyance passage which is a passage where a conveyance object is conveyed, a conveyance member moving the conveyance object along the conveyance passage, a motor driving the conveyance member, a control part controlling an output torque of the motor, a conveyance state identifying means identifying a conveyance state that is a position and/or a conveyance direction of the conveyance object in the conveyance passage, and a storage part which upper limit torque information which is an upper limit value of an output torque allowable for the motor or a parameter value required for calculation of the upper limit value is registered for each type of the conveyance state.

A drive apparatus according to the present invention includes a stepping motor that transmits power to a rotating shaft of a conveyance roller, a brushless motor that transmits power to the rotating shaft of the conveyance roller, a first controller that controls an operation of the stepping motor so that the stepping motor rotates at a constant speed, and a second controller that controls an operation of the brushless motor. The second controller switches control of the brushless motor between, in accordance with a conveyance state of the sheet, assist control in which power of the brushless motor assists a rotation of the stepping motor, brake control in which power of the brushless motor prevents the rotation of the stepping motor, and neutral control in which power of the brushless motor does not affect the rotation of the stepping motor.

An image reading apparatus includes a roller that transports a document; a reading unit that reads an image of the document which is transported; a DC motor that drives the roller; and a control unit that controls the DC motor. The control unit is configured to stop driving of the DC motor in a case where a driving load value obtained when the DC motor is driven exceeds a threshold. A first threshold which is applied in a case of a first document and a second threshold which is applied in a case of a second document of which a basis weight is larger than a first basis weight are set, and the first threshold is less than the second threshold.

An image reading apparatus includes a roller that transports a document; a reading unit that reads an image of the document which is transported; a DC motor that drives the roller; and a control unit that controls the DC motor. The control unit is configured to stop driving of the DC motor in a case where a driving load value obtained when the DC motor is driven exceeds a threshold. A first threshold which is applied in a case of a first document and a second threshold which is applied in a case of a second document of which a basis weight is larger than a first basis weight are set, and the first threshold is less than the second threshold.