# US 2010/0164162 A1 · Sheet stacking apparatus and image forming apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0164162 A1 - Document ID: US20100164162A1 - Status: Published application - Kind: A1 - Application number: 12/641,607 - Filed: 2009-12-18 - Published: 2010-07-01 - Earliest claimed: 2008-12-26 - Assignees: Canon Kabushiki Kaisha - Inventors: Yusuke Obuchi - Web page: https://patentgrep.com/patent/US20100164162A1 ## CPC - B65H 29/041: {and introducing into a pile (slowing-down from grippers B65H29/683)} - B65H 29/125: {between two sets of rollers} - B65H 31/26: Auxiliary devices for retaining articles in the pile - B65H 31/36: Auxiliary devices for contacting each article with a front stop as it is piled - B65H 2301/44712: carried by chains or bands - B65H 2301/4474: Pair of cooperating moving elements as rollers, belts forming nip into which material is transported - B65H 2405/15: Large capacity supports arrangements - B65H 2513/10: Speed - B65H 2801/06: Office-type machines, e.g. photocopiers - B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES ## Abstract The present invention relates to a sheet stacking device comprising a discharging portion, a moving portion that holds a downstream end portion of the sheet, a stacking portion and a control portion that controls the discharging portion and the moving portion. The control portion controls at least one of the discharging portion and a moving portion so that the movement velocity of the moving portion is higher than the sheet discharge velocity of the discharging portion, and separates the sheet from the moving portion by using a velocity difference between the movement velocity and the sheet discharge velocity. ## Claims ### Claim 1 A sheet stacking apparatus comprising: a discharging portion that discharge a sheet; a moving portion that moves the sheet to the downstream side in the sheet discharging direction while holding a downstream end portion of the sheet, discharged by the discharging portion, in a sheet discharging direction; a stacking portion on which the sheet is stacked; and a control portion that controls the discharging portion and the moving portion, wherein the control portion controls at least one of the discharging portion and the moving portion so that the movement velocity of the moving portion is higher than the sheet discharge velocity of the discharging portion, and separates the sheet from the moving portion by using a velocity difference between the movement velocity and the sheet discharge velocity. ### Claim 2 (depends on 1) The sheet stacking apparatus according to claim 1, wherein a sheet holding force of the moving portion is set to be smaller than a sheet holding force of the discharging portion. ### Claim 3 (depends on 1) The sheet stacking apparatus according to claim 1, further comprising: a positioning unit which includes a positioning portion that positions a downstream end of the sheet, which is to be stacked on the stacking portion, in the sheet discharging direction and a guide portion that guides the sheet toward the stopper, wherein a position where the sheet is separated from the moving portion is an upstream of the guide portion in the sheet discharging direction. ### Claim 4 (depends on 3) The sheet stacking apparatus according to claim 3, wherein the guide portion is a tapered portion that guides the sheet toward the positioning portion. ### Claim 5 (depends on 3) The sheet stacking apparatus according to claim 3, wherein the guide portion is a rotating member that moves the sheet toward the positioning portion. ### Claim 6 (depends on 3) The sheet stacking apparatus according to claim 3, wherein the guide unit is movable in the sheet discharging direction. ### Claim 7 (depends on 1) The sheet stacking apparatus according to claim 1, further comprising: a positioning portion that positions a downstream end of the sheet, which is to be stacked on the stacking portion, in the sheet discharging direction, wherein a position where the sheet is separated from the moving portion is an upstream of the positioning portion in the sheet discharging direction. ### Claim 8 A sheet stacking apparatus comprising: a discharging portion that discharge a sheet; a moving portion that moves the sheet to the downstream side in the sheet discharging direction while holding a downstream end portion of the sheet, discharged by the discharging portion, in a sheet discharging direction; a stacking portion on which the sheet is stacked; a positioning unit that positions a downstream end of the sheet, which is to be stacked on the stacking portion, in the sheet discharging direction; and a control portion that controls the discharging portion and the moving portion, wherein the control portion controls to separate the sheet from the moving portion while moving with the held sheet before a downstream end portion of the sheet, in a sheet discharging direction, reaches the positioning unit. ### Claim 9 (depends on 8) The sheet stacking apparatus according to claim 8, wherein a sheet holding force of the moving portion is set to be smaller than a sheet holding force of the discharging portion. ### Claim 10 (depends on 8) The sheet stacking apparatus according to claim 8, wherein the positioning unit comprising: a positioning portion that positions a downstream end of the sheet, which is to be stacked on the stacking portion, in the sheet discharging direction; and a guide portion for guiding the sheet toward the positioning portion, wherein a position where the sheet is separated from the moving portion is an upstream of the guide portion in the sheet discharging direction. ### Claim 11 (depends on 10) The sheet stacking apparatus according to claim 10, wherein the guide portion is a tapered portion that guides the sheet toward the positioning portion. ### Claim 12 (depends on 10) The sheet stacking apparatus according to claim 10, wherein the guide portion is a rotating member that moves the sheet toward the positioning portion. ### Claim 13 (depends on 10) The sheet stacking apparatus according to claim 10, wherein the guide portion is movable in the sheet discharging direction. ### Claim 14 (depends on 8) The sheet stacking apparatus according to claim 8, wherein the positioning unit comprising: a positioning portion that positions a downstream end of the sheet, which is to be stacked on the stacking portion, in the sheet discharging direction, wherein a position where the sheet is separated from the moving portion is an upstream of the positioning portion in the sheet discharging direction. ### Claim 15 (depends on 1) An image forming apparatus comprising: an image forming portion that forms an image on a sheet; and the sheet stacking apparatus according to claim 1 on which the sheet is stacked, the image being formed on the sheet by the image forming portion. ### Claim 16 (depends on 8) An image forming apparatus comprising: an image forming portion that forms an image on a sheet; and the sheet stacking apparatus according to claim 8 on which the sheet is stacked, the image being formed on the sheet by the image forming portion. ### Claim 17 An image forming apparatus comprising: an image forming portion that forms an image on a sheet; a sheet stacking apparatus on which the sheet is stacked, the image being formed on the sheet by the image forming portion; and a control portion that controls the sheet stacking apparatus, wherein the sheet stacking apparatus includes a discharging portion that discharge a sheet; a moving portion that holds a downstream end portion of the sheet, which is discharged by the discharging portion, in a sheet discharging direction and moves the sheet to the downstream side in the sheet discharging direction; and a stacking portion on which the sheet is stacked, and wherein the control portion controls at least one of the discharging portion and the moving portion so that the movement velocity of the moving portion is higher than the sheet discharge velocity of the discharging portion, and separates the sheet from the moving portion by using a velocity difference between the movement velocity and the sheet discharge velocity. ### Claim 18 (depends on 17) The image forming apparatus according to claim 17, further comprising: a positioning unit which includes a positioning portion that positions a downstream end of the sheet, which is to be stacked on the stacking portion, in the sheet discharging direction and a guide portion that guides the sheet toward the stopper, wherein a position where the sheet is separated from the moving portion is an upstream of the guide portion in the sheet discharging direction. ### Claim 19 (depends on 18) The image forming apparatus according to claim 18, wherein the guide portion is a tapered portion that guides the sheet toward the positioning portion. ### Claim 20 (depends on 18) The image forming apparatus according to claim 18, wherein the guide portion is a rotating member that moves the sheet toward the positioning portion. ### Claim 21 An image forming apparatus comprising: an image forming portion that forms an image on a sheet; a sheet stacking device on which the sheet is stacked, the image being formed on the sheet by the image forming portion; and a control portion that controls the sheet stacking device, wherein the sheet stacking device includes a discharging portion that discharge a sheet; a moving portion that holds a downstream end portion of the sheet, which is discharged by the discharging portion, in a sheet discharging direction and moves the sheet to the downstream side in the sheet discharging direction; and a stacking portion on which the sheet is stacked, and wherein the control portion controls to separate the sheet from the moving portion while moving with the held sheet before a downstream end portion of the sheet, in a sheet discharging direction, reaches the positioning unit. ### Claim 22 (depends on 21) The image forming apparatus according to claim 21, further comprising: a positioning unit which includes a positioning portion that positions a downstream end of the sheet, which is to be stacked on the stacking portion, in the sheet discharging direction and a guide portion that guides the sheet toward the stopper, wherein a position where the sheet is separated from the moving portion is an upstream of the guide portion in the sheet discharging direction. ### Claim 23 (depends on 22) The image forming apparatus according to claim 22, wherein the guide portion is a tapered portion that guides the sheet toward the positioning portion. ### Claim 24 (depends on 22) The image forming apparatus according to claim 22, wherein the guide portion is a rotating member that moves the sheet toward the positioning portion.