A paper thickness detecting device that detects a paper thickness in accordance with a detection signal of a displacement sensor, includes: a pair of paper thickness detecting rollers including a first roller and a second roller that pinch a paper conveyed via a pair of conveyance rollers; and the displacement sensor that detects a displacement amount of the pair of paper thickness detecting rollers at the time when the paper passes through the pair of paper thickness detecting rollers, wherein the paper thickness is detected on the basis of the displacement amount of the pair of paper thickness detecting rollers that follows to rotate with respect to the paper conveyed via the pair of conveyance rollers.

A sheet feeding device comprising: a stacking member on which a sheet is stacked; a first conveying portion that conveys a sheet stacked on the stacking member; a second conveying portion that separates and conveys a sheet conveyed by the first conveying portion; a stopper member that stops a sheet whose front end is abutted against the stopper member at an upstream of the second conveying portion in a sheet conveying direction, wherein the stopper member can be at a first position where the sheet can be stopped and a second position where the sheet can pass the stopper member, and wherein the stopper member can move from the first position toward the second position such that a sheet conveyed by the first conveying portion reaches the second conveying portion while maintaining a state where the front end of the sheet is abutted to the stopper member.

An imaging system includes an imaging station, an actuator for driving a medium roller for controllably displacing the medium along a media transport path, and a controller assembly. The controller assembly includes a sensor device for generating a position signal and a processor for processing the position signal. The actuator is actuated in response to an actuation command from the controller assembly, which actuation command is derivable from a feedback component and a feedforward component. The feedback component is based on a position error. The processor is further arranged for determining a time dependent status parameter, which status parameter represents a status of the medium on the medium roller. The processor is further arranged for deriving an actuation command estimate based on the status parameter, and wherein the feedforward component includes the actuation command estimate.

A recording apparatus includes a setting section on which it is possible to set a medium, a recording section that is capable of recording a recording image on a set medium, which is the medium that is set in the setting section on the basis of image data, a designation section that is capable of designating a recording position of the recording image on the set medium, and a control section that causes the recording image to be recorded on the set medium on the basis of the recording position that is designated by the designation section. In a recording apparatus with such a configuration, it is possible to suppress recording position shift of the recording image arises in accordance with setting position shift of a medium.

A paper receiving device includes a paper receiving member that receives a paper sheet; a first detector that detects whether or not a size of the paper sheet received by the paper receiving member is greater than a first size; a second detector that detects whether or not the size of the paper sheet received by the paper receiving member is smaller than a second size that is smaller than the first size; and an open-state detector that detects that the paper receiving device is opened when the first detector detects that the size of the paper sheet is greater than the first size and the second detector detects that the size of the paper sheet is smaller than the second size.

An image formation apparatus includes, in an apparatus body, a sensing portion which senses presence or absence of depression by a paper feed unit. The sensing portion includes a slider provided to be slidingly movable along a mounting direction of the paper feed unit, a push switch arranged behind the slider along the mounting direction, and a first elastic body and a second elastic body for elastically biasing the slider toward a direction away from the push switch. The first elastic body is interposed between the slider and a portion which does not relatively move with respect to the apparatus body, and the second elastic body is interposed between the slider and a switch portion of the push switch.

An imaging system includes an imaging station, an actuator for driving a medium roller for controllably displacing the medium along a media transport path, and a controller assembly. The controller assembly includes a sensor device for generating a position signal and a processor for processing the position signal. The actuator is actuated in response to an actuation command from the controller assembly, which actuation command is derivable from a feedback component and a feedforward component. The feedback component is based on a position error. The processor is further arranged for determining a time dependent status parameter, which status parameter represents a status of the medium on the medium roller. The processor is further arranged for deriving an actuation command estimate based on the status parameter, and wherein the feedforward component includes the actuation command estimate.

An image acquiring device for a sheet-type medium includes an upper passage plate and a lower passage plate, a gap being reserved between the upper passage plate and the lower passage plate to form a passage; at least two driving wheels mounted on the lower passage plate, and configured to drive the sheet-type medium entered into the passage to advance along the direction of the passage; at least two floating pinch rollers mounted on the upper passage plate, and each being mounted cooperatively with a respective driving wheel and being tangent to the driving wheel at a tangential point, and being configured to apply a pressure to the sheet-type medium to allow the sheet-type medium to cling to the driving wheel; and an image collecting device, mounted between two sets of the driving wheels and the floating pinch rollers, and configured to collect an image of the sheet-type medium.

An ultrasonic device includes an ultrasonic element configured to perform at least one of transmission of an ultrasonic wave along a first axis and reception of the ultrasonic wave input along the first axis, and a protective member provided on the first axis to cover the ultrasonic element. The protective member has a first surface provided with at least one hole through which the ultrasonic wave travelling along the first axis passes, and a second surface intersecting with the first surface and provided with a first opening through which foreign matter entering from the at least one hole is discharged.