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US 2022/0055851 A1Published application
Sheet conveying device, image forming apparatus, and sheet presence or absence determination method
AssigneeToshiba Tec Kabushiki Kaisha
InventorTakeshi Ito
Life of this patent
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Abstract
According to one embodiment, a sheet conveying device includes a placement tray, a presence detection sensor, and a control unit. The placement tray places a sheet thereon. The presence detection sensor detects the presence or absence of the sheet on the placement tray. The control unit delays a determination timing of the presence or absence of the sheet placed on the placement tray to a predetermined timing when a condition indicating that the remaining sheets placed on the placement tray are only a few is satisfied.
Claims14
A sheet conveying device, comprising:
- a placement tray configured to hold a sheet thereon;
- a presence detection sensor configured to detect a presence or absence of the sheet on the placement tray;
- a control unit configured to delay a determination timing of the presence or absence of the sheet on the placement tray to a predetermined timing, when a predetermined condition is satisfied, the predetermined condition is a lifted amount of the placement tray becomes equal to or greater than a specified value or a predetermined number of sheets on the placement tray are fed;
- a first next-sheet feeding sensor configured to detect a presence or absence of the sheet on a path along which the sheet is conveyed;
- and
- a second next-sheet feeding sensor installed on a downstream side of the first next-sheet feeding sensor and configured to detect the presence or absence of the sheet on the path along which the sheet is conveyed, wherein
- the predetermined timing is a timing when the second next-sheet feeding sensor detects the absence of the sheet, and
- the control unit determines the presence or absence of the sheet based on a detection result of the presence detection sensor obtained after the predetermined timing is reached.
5 more elements
A sheet conveying device, comprising:
- a placement tray configured to hold a sheet thereon;
- a presence detection sensor configured to detect a presence or absence of the sheet on the placement tray;
- and
- a control unit configured to delay a determination timing of the presence or absence of the sheet on the placement tray to a predetermined timing, when a condition indicating that a lifted amount of the placement tray becomes equal to or greater than a specified value is satisfied, wherein
- the control unit calculates the lifted amount of the placement tray based on the time until the placement tray is lifted from a lower limit position to an upper limit position and the time from the start of the lifting of the placement tray to the stop of the lifting of the placement tray during feeding of the sheet.
2 more elements
An image forming apparatus, comprising:
- a placement tray configured to hold a sheet thereon;
- a presence detection sensor configured to detect a presence or absence of the sheet on the placement tray;
- a control unit configured to delay a determination timing of the presence or absence of the sheet on the placement tray to a predetermined timing, when a predetermined condition is satisfied, the predetermined condition is a lifted amount of the placement tray becomes equal to or greater than a specified value or a predetermined number of sheets on the placement tray are fed;
- a first next-sheet feeding sensor configured to detect a presence or absence of the sheet on a path along which the sheet is conveyed;
- a second next-sheet feeding sensor installed on a downstream side of the first next-sheet feeding sensor and configured to detect the presence or absence of the sheet on the path along which the sheet is conveyed, wherein
- the predetermined timing is a timing when the second next-sheet feeding sensor detects the absence of the sheet, and
- the control unit determines the presence or absence of the sheet based on a detection result of the presence detection sensor obtained after the predetermined timing is reached;
- a storage unit configured to store a second sheet;
- and
- a printer unit configured to form an image on the second sheet fed from the storage unit based on image information generated from the first sheet.
7 more elements
An image forming apparatus, comprising:
- a placement tray configured to hold a sheet thereon;
- a presence detection sensor configured to detect a presence or absence of the sheet on the placement tray;
- a control unit configured to delay a determination timing of the presence or absence of the sheet on the placement tray to a predetermined timing, when a condition indicating that a lifted amount of the placement tray becomes equal to or greater than a specified value is satisfied, wherein
- the control unit calculates the lifted amount of the placement tray based on the time until the placement tray is lifted from a lower limit position to an upper limit position and the time from the start of the lifting of the placement tray to the stop of the lifting of the placement tray during feeding of the sheet;
- a storage unit configured to store a second sheet;
- and
- a printer unit configured to form an image on the second sheet fed from the storage unit based on image information generated from the first sheet.
4 more elements
Dependencies are inferred from the claim text.