Sheet Conveyer
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsYoshihiro Okamoto, Tomoyuki Mizuno
Life of this patent
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Abstract
A sheet conveyer, having a sheet tray, a tray-driving mechanism, a conveyance guide, a feed roller, a conveyer-driving mechanism, a first sensor, and a controller, is provided. The controller controls the tray-driving mechanism and the conveyer-driving mechanism, during a sequential conveying action, when the first sensor detects an upper-surface level being at a lower limit of a correct range, delay a lift-start timing, at which the tray-driving mechanism starts moving the sheet tray upward, to be later at least than a timing, at which the feed roller after feeding one of the sheets completely and pausing resumes rotating for feeding a next one of the sheets, and cause the sheet tray to complete moving to a higher position prior to completion of feeding of the next sheet.
Claims6
A sheet conveyer, comprising:
- a sheet tray configured to support sheets for being fed;
- a tray-driving mechanism configured to move the sheet tray vertically;
- a conveyance guide configured guide the sheets fed from the sheet tray;
- a feed roller configured to feed the sheets supported by the sheet tray along the conveyance guide by rotating;
- a conveyer-driving mechanism configured to drive the feed roller, the conveyer-driving mechanism being configured to, for a sequential conveying action to convey a plurality of ones of the sheets supported by the sheet tray sequentially, cause the feed roller to pause after feeding one of the sheets completely and before starting to feed a next one of the sheets;
- a first sensor configured to detect whether a top-surface level being a height level of an uppermost one of the sheets supported by the sheet tray is at a lower limit of a correct range for feeding the sheets along the conveyance guide;
- and
- a controller configured to control the tray-driving mechanism and the conveyer-driving mechanism, the controller being configured to, during the sequential conveying action, when the first sensor detects the upper-surface level being at the lower limit of the correct range, delay a lift-start timing, at which the tray-driving mechanism starts moving the sheet tray upward, to be later at least than a timing, at which the feed roller after feeding one of the sheets completely and pausing resumes rotating for feeding the next one of the sheets, and cause the sheet tray to complete moving to a higher position prior to completion of feeding of the next sheet.
Dependencies are inferred from the claim text.