A sheet detecting device includes a moving member supported movably from a standby position to a detecting position detecting a sheet by being pushed by the sheet moving on a sheet stacking portion toward a first direction and a detecting sensor detecting the move of the moving member. The sheet detecting device also includes a retracting mechanism retracting the moving member movably to the detecting position in associate with a move of the sheet to a second direction orthogonal to the first direction.

Provided is a technique capable of detecting the amount of a stack of discharged print media and increasing print speed. A printing apparatus includes a displacement member configured to be in contact with the discharged print media and be displaced according to the amount of the stack of the print media, and detects the stack amount based on the displacement of the displacement member. The apparatus performs a first or second detection operation based on the detected stack amount. In the first detection operation, after a specified number of print media are discharged with the displacement member positioned at the evacuation position where it does not come into contact with a print medium, the displacement member is brought into contact with the print media to detect the stack amount. In the second detection operation, the stack amount is detected with the displacement member in contact with the print media.

A medium conveying apparatus includes a pick roller feeding a medium, a separation roller placed on a downstream side of the pick roller in a conveying direction of a medium, an arrival detection sensor placed on a downstream side of the separation roller in the conveying direction and detecting arrival of a medium, a lift sensor detecting a lift of a medium between an upstream side of a roller nip of the pick roller and a downstream side of a roller nip of the separation roller, and a processor. The processor determines that a medium is a bound medium when a lift of a medium is detected by the lift sensor in a first predetermined period after detection of a front edge of a medium in a conveying direction by the arrival detection sensor, and executes abnormality processing when a medium is determined to be a bound medium.

An image forming apparatus includes a tray; a casing having a first outlet, a second outlet above the first outlet, a first path, and a second path; a stack lever; a drive source; and a controller. The second path communicates with the second outlet such that a sheet conveyed along the second path is partially discharged from the second outlet and is reversed along the second path. The first outlet communicates with the first path such that the sheet conveyed along the first path is discharged from the first outlet onto the tray. The stack lever is movable between a first position where the stack lever presses a sheet on the tray and a second position higher than the first position. The controller is configured to control the drive source such that, when the sheet is discharged from the second outlet, the stack lever is at the second position.

A sheet detection device includes, as detection pieces, a first detection piece integrally provided on a rotary shaft and a second detection piece attached to the first detection piece via a biasing member. The second detection piece is capable of rotation in conjunction with the first detection piece under a biasing force of the biasing member. When the second detection piece is brought into contact with a ceiling at an upper part of the rotary shaft, the second detection piece stops further rotation while the first detection piece is capable of rotation together with the rotary shaft against the biasing force.

An image forming apparatus having a controller and capable of forming images in double-face printing is provided. The controller conducts a measuring process to measure a time period corresponding to a sheet length; a comparison process to compare a measured value with a switch threshold value being a value in a range of a measurement error allowed to the measured value; and one of a first conveying process, in which a conveying unit is driven to convey a predetermined number of sheets circulating in a conveying path, and a second conveying process, in which the conveying unit is driven to convey a greater number of sheets than the predetermined number circulating in the conveying path. The controller conducts the first conveying process when the measured value is greater than the switch threshold value and conducts the second conveying process when the measured value is smaller than the switch threshold value.

Provided is a printing apparatus that prevents a print medium from buckling during discharging, a method of controlling a printing apparatus, and a storage medium. In the case where the print conveyance speed determined by the print mode is higher than or equal to the specified speed, the print medium after printing is conveyed to the discharging tray at the print conveyance speed, and in the case where the print conveyance speed determined by the print mode lower than the specified speed, the print medium after printing is conveyed to the discharging tray at the specified speed increased from the print conveyance speed.

A paper feeding device includes a lower cover, an upper cover pivotally covered to the lower cover, at least one motor mounted to the lower cover, a feeding roller assembly and a paper skew judging module. The feeding roller assembly is pivotally connected to the lower cover and connected with the at least one motor. The paper skew judging module disposed to the lower cover, has an infrared light emitter, an infrared light receiver, a cantilever arm rotatably assembled to the lower cover, a sensing roller pivotally connected with the cantilever arm, and a lens. The infrared light emitter is mounted to the lower cover. The infrared light receiver is mounted to the lower cover and is disposed opposite to the infrared light emitter. The lens is fastened to the cantilever arm, and disposed between the infrared light emitter and the infrared light receiver. The lens have different photopermeabilities.

A detection system for detecting double sheets being supplied to a lateral positioning device (100) for a sheet element (20, 20) in a sheet element processing machine. The machine has a drive system including a cam disk (174) and a cam follower lever (172). The detection system includes a detector lever (130) mounted so as to be displaceable between a sheet receiving position and a detection position. The detector lever (130) has a sheet sensing end (132) for engagement with an upper face of the sheet element (20, 20) when being in the detection position, and a position detector end (133) for cooperating, when being in the detection position, with a position detector (140) adapted for generating a signal dependent on the thickness of the sheet element (20, 20), and further includes a raising lever (170) for raising the sheet sensing end (132) of the detector lever (130). The raising lever (170) is mounted on the cam follower lever (172) of the sheet element processing machine. Further disclosed is a sheet element processing machine including a detection system as outlined above, mounted in an introduction station (10) upstream of a processing station.

A sheet storage apparatus (for example, a banknote storage mechanism 32) includes an entering unit (for example, a pushing unit 46) configured to enter into a storage bag (for example, a banknote storage bag 34) supported by a supporter (for example, holding members 36) and a controller 80 configured to control the driving unit (for example, a motor 54) for driving the entering unit. The controller 80 controls the driving unit such that the entering unit enters into the storage bag supported by the supporter and comes in contact with the sheet stored in the storage bag to detect an upper end position of the sheet stored in the storage bag.