Patent ID: 9592979
Date: 2017-03-14
CPC Classifications: B65H

Claim:
1. A sheet feeder, comprising: a case; a tray that is arranged in the case and that has a placement surface having an upper surface on which a sheet is placed; a sheet conveyance path that extends from the tray in the case and through which the sheet is conveyed in a predetermined conveyance direction; a paper feed member that is arranged on an entrance side of the sheet conveyance path and that conveys the sheet in the conveyance direction; a first detection section that detects a leading end side in the conveyance direction of the sheet placed on the placement surface; a second detection section that is arranged at an end section of the tray on a trailing end side in the conveyance direction and that detects a trailing end side in the conveyance direction of the sheet placed on the placement surface; and a restricting member that restricts a leading end edge of the sheet placed on the tray, wherein a distance from the restricting member to the second detection section in the conveyance direction is longer than 210 mm and shorter than 315 mm; the second detection section is a pressure-type sensor that detects the sheet placed on the placement surface by being pressed by the sheet and includes: an actuator that includes a rotation fulcrum arranged at an end section on the trailing end side of the tray in the conveyance direction, a pressed section extending from the rotation fulcrum so as to protrude from an end edge of the tray on the trailing end side of the tray and at an upstream side of the rotation fulcrum in the conveyance direction, the pressed section being pressed by the sheet placed on the placement surface, and a shielding plate extending from the rotation fulcrum in a direction that differs from a direction of extension of the pressed section from the rotation fulcrum, and the actuator being rotatable around the rotation fulcrum; and a detection sensor that is capable of detecting the shielding plate in conjunction with the rotation of the actuator.