Abstract: A sheet stacking apparatus includes an endless belt member onto which sheets are stacked and which moves rotationally to convey the sheets; a plurality of holding members that is provided on the belt member and that holds the sheets down to a sheet stacking surface of the belt member to nip the sheets; and sheet detecting portions which detect presence or absence of sheets between the holding members and the sheet stacking surface of the belt member, the sheet detecting portions each include a light emitting portion that emits light and a light receiving portion that receives the light, and the light emitting portions and the light receiving portions are fixedly provided below the sheet stacking surface of the belt member so that the light emitting portions and the light receiving portions detect presence or absence of a sheet at times when facing the holding members.

Abstract: A sheet discharged from a sheet discharging portion arranged at a distance from a sheet stacking portion, to a stacking portion, is conveyed along the sheet stacking portion while the sheet edge on an upstream side in a sheet discharging direction is held. A shifting unit arranged downstream of the sheet stacking portion in the sheet discharging direction shifts the discharged sheet from the sheet discharging portion toward the downstream side in the sheet discharging direction while a pressing member presses the sheet to the sheet stacking portion.

Abstract: A sheet processing apparatus includes a processing tray configured to stack a sheet to be processed, a sheet overlap unit configured to allow a sheet fed while the sheet to be processed is stacked on the processing tray, to be overlaid and made to wait, first and second bundle conveyance rollers configured to convey the sheet to the processing tray from the sheet overlap unit, and a sheet processing apparatus control unit configured to control an overlap operation in the sheet overlap unit, wherein the sheet processing apparatus control unit determines, based on sheet information relating to the sheet fed to the sheet overlap unit, whether a sheet to be then fed is overlaid on the sheet fed to the sheet overlap unit.

Abstract: A sheet-stacking apparatus includes a gripper configured to convey a sheet, two stacker trays stacking sheets arranged in a row, and a support member configured to separately elevate the two stacker trays. The stacker tray is selected according to a sheet length.

Abstract: A sheet conveying apparatus has a first pair of rollers which nip and convey a sheet; a second pair of rollers provided on a downstream side of the first pair of rollers in a conveying direction of the sheet, which nip and convey a sheet; and a position detecting sensor which detects a position of a sheet in a width direction which is perpendicular to the conveying direction. When the first pair of rollers and the second pair of rollers nip and convey the sheet, the first pair of rollers and the second pair of rollers are simultaneously moved according to a position detected by the position detecting sensor in the same direction of the width direction which is perpendicular to the conveying direction.

Abstract: A sheet stacking apparatus includes a gripper configured to discharge a sheet, a plurality of stacker trays arranged in a row and configured to stack the discharged sheet, and a guiding unit configured to guide the discharged sheet to a predetermined position. The plurality of stacking trays are horizontally arranged so that a large number of sheets can be stacked without increasing the size of the sheet stacking apparatus.

Abstract: A sheet processing apparatus includes a staple processing portion and a sheet stacking portion on which a sheet is stacked and abutted. The sheet processing apparatus also includes a fold processing portion, a conveyance guide member, an end part processing portion to perform an end part process to the folded end part, and a controlling portion. After a stapling process is performed, the fold processing portion folds the sheet bundle in two to create a folded sheet bundle having a folded end part between a first surface and a second surface. The conveyance guide member guides the folded sheet bundle with the folded end part as a leading end while the first surface slides against the conveyance guide member. The controlling portion controls the positioning member such that the stapling position is moved, by a predetermined distance, to an area on the sheet bundle that will become the second surface.

Abstract: A sheet punching device includes a first blade, a first die into which the first blade is fitted from a first surface of a sheet to form a punch hole in the sheet, a second blade, and a second die into which the second blade is fitted. The second blade is inserted into the punch hole formed by the first blade from a second surface of the sheet and fitted into the second die.

Abstract: A sheet stacking apparatus includes a conveyance portion, a first sheet stacking portion, a second sheet stacking portion, and a controller. The conveyance portion includes a holding portion that moves while holding a downstream end of a sheet. The first and second sheet stacking portions include stacking surfaces and the second sheet stacking portion is arranged downstream of the first sheet stacking portion. The controller controls to cause the holding portion to convey to the second sheet stacking portion. When the sheet to be stacked on the second sheet stacking portion passes over the first sheet stacking portion, an upstream end of the sheet in the sheet conveying direction is guided along the first sheet stacking portion stacking surface, on which a sheet is not stacked, while the downstream end of the sheet is held by the holding portion.

Abstract: A sheet stacking apparatus includes an endless belt member onto which sheets are stacked and which moves rotationally to convey the sheets; a plurality of holding members that is provided on the belt member and that holds the sheets down to a sheet stacking surface of the belt member to nip the sheets; and sheet detecting portions which detect presence or absence of sheets between the holding members and the sheet stacking surface of the belt member, the sheet detecting portions each include a light emitting portion that emits light and a light receiving portion that receives the light, and the light emitting portions and the light receiving portions are fixedly provided below the sheet stacking surface of the belt member so that the light emitting portions and the light receiving portions detect presence or absence of a sheet at times when facing the holding members.

Abstract: A sheet processing apparatus capable of improving sheet processing performance and productivity is provided. While sheets are conveyed in a piled state toward a rear-end stopper, displacement is produced between the sheets by a pair of discharge rollers. Even if adhesion occurs between the sheets during conveyance thereof, the adhesion between the sheets can be removed before the sheets come into contact with the rear-end stopper.

Abstract: A sheet stacking apparatus includes a conveyance portion, a first sheet stacking portion, a second sheet stacking portion, and a controller. The conveyance portion includes a holding portion that moves while holding a downstream end of a sheet. The first and second sheet stacking portions include stacking surfaces and the second sheet stacking portion is arranged downstream of the first sheet stacking portion. The controller controls to cause the holding portion to convey to the second sheet stacking portion. When the sheet to be stacked on the second sheet stacking portion passes over the first sheet stacking portion, an upstream end of the sheet in the sheet conveying direction is guided along the first sheet stacking portion stacking surface, on which a sheet is not stacked, while the downstream end of the sheet is held by the holding portion.

Abstract: A stacker includes a sheet discharging portion constituted by a discharging belt and an extension roller that is in contact with the discharging belt. The position of the extension roller is changeable along the discharging belt. This means that, in the stacker, the position from which a sheet is discharged is changeable to a desired position in accordance with the sheet length by changing the position of the extension roller. Therefore, it is possible to stack sheets at a desired position on stacker trays, enabling the user to easily carry the stacked sheets from the stacker.

Abstract: A sheet stacking apparatus includes a sheet stack portion having a plurality of separately elevatable stacker trays configured to stack a conveyed sheet and arranged one after the other in a sheet conveying direction. When a number of sheets to be stacked is greater than a number of sheets stackable on a stacker tray, the sheets are conveyed on one stacker tray and then stacked on another stacker tray so that the sheet stacking apparatus is capable of stacking a large number of sheets.

Abstract: A sheet processing apparatus capable of improving sheet processing performance and productivity is provided. While sheets are conveyed in a piled state toward a rear-end stopper, displacement is produced between the sheets by a pair of discharge rollers. Even if adhesion occurs between the sheets during conveyance thereof, the adhesion between the sheets can be removed before the sheets come into contact with the rear-end stopper.

Abstract: The sheet processing apparatus includes a sheet-discharge fan that blows air downward of a sheet-discharged by an upper sheet-discharge roller, and a control portion configured to control an air velocity of air blown from the sheet-discharge fan according to a basic weight of the sheet. In the case where the basic weight of the sheet is a predetermined value or less, the control portion increases the air velocity of the sheet-discharge fan according to the basic weight of the sheet based on basic weight information from an input portion for inputting the basic weight information of the sheet. The control portion also controls the air velocity of the sheet-discharge fan to be a velocity at which the sheet whose rear edge contacts the sheet-stacking wall does not move in a sheet-discharge direction in the case where the basic weight of the sheet exceeds the predetermined value.

Abstract: A sheet stacking device has a discharging portion, a holding portion that holds a downstream end portion of the sheet, a stacking portion and a control portion that controls the discharging portion and the holding portion. The control portion controls at least one of the discharging portion and a holding portion so that the movement velocity of the holding portion is higher than the sheet discharge velocity of the discharging portion, and separates the sheet from the holding portion by using a velocity difference between the movement velocity and the sheet discharge velocity.

Abstract: A sheet discharged from a sheet discharging portion arranged at a distance from a sheet stacking portion, to a stacking portion, is conveyed along the sheet stacking portion while the sheet edge on an upstream side in a sheet discharging direction is held. A shifting unit arranged downstream of the sheet stacking portion in the sheet discharging direction shifts the discharged sheet from the sheet discharging portion toward the downstream side in the sheet discharging direction while a pressing member presses the sheet to the sheet stacking portion.

Abstract: A sheet conveying apparatus has a first pair of rollers which nip and convey a sheet; a second pair of rollers provided on a downstream side of the first pair of rollers in a conveying direction of the sheet, which nip and convey a sheet; and a position detecting sensor which detects a position of a sheet in a width direction which is perpendicular to the conveying direction. When the first pair of rollers and the second pair of rollers nip and convey the sheet, the first pair of rollers and the second pair of rollers are simultaneously moved according to a position detected by the position detecting sensor in the same direction of the width direction which is perpendicular to the conveying direction.

Abstract: A sheet discharged from a sheet discharging portion arranged at a distance from a sheet stacking portion, to a stacking portion, is conveyed along the sheet stacking portion while the sheet edge on an upstream side in a sheet discharging direction is held. A shifting unit arranged downstream of the sheet stacking portion in the sheet discharging direction shifts the discharged sheet from the sheet discharging portion toward the downstream side in the sheet discharging direction while a pressing member presses the sheet to the sheet stacking portion.