Adjustment for automatic document sheet reading with image reading device

摘要

An image reading device includes transparent plate member, reading portion, support member, and adjustment mechanism. The transparent plate member is an elongated plate extending in a second direction perpendicular to a first direction, and is in contact with a reading surface of a document sheet when the document sheet is moved in the first direction during an automatic document sheet reading. The reading portion is disposed below the transparent plate member. The support member supports a lower surface of the transparent plate member at two support points separated in the second direction. The adjustment mechanism biases an extension end portion, extending outward from one of the support points, of the support member in a downward direction opposite to the supporting direction of the support member, and adjusts a distance between the transparent plate member and the reading portion by changing a biasing force applied to the extension end portion.

主权项

1. An image reading device comprising:
a transparent plate member configured to be in contact with a reading surface of a document sheet when the document sheet is moved in a first direction during an automatic document sheet reading, the transparent plate member being elongated and extending in a second direction perpendicular to the first direction; a reading portion disposed below the transparent plate member; a support member supporting a lower surface of the transparent plate member at two support points that are separated from each other in the second direction; an adjustment mechanism configured to bias an extension end portion of the support member in a downward direction opposite to a direction in which the transparent plate member is supported by the support member, the extension end portion extending outward from one of the two support points, and to adjust a distance between the transparent plate member and the reading portion by changing a biasing force applied to the extension end portion of the support member; and a cover portion covering an upper surface of the extension end portion, wherein
the adjustment mechanism adjusts the distance by displacing the extension end portion downward by abutting on the upper surface of the extension end portion through an opening formed in the cover portion and changing an amount of downward displacement of the extension end portion; andthe adjustment mechanism includes a disk member and a rotation shaft, the disk member being inserted through the opening of the cover portion such that an outer rim portion of the disk member abuts on the upper surface of the extension end portion, the rotation shaft rotationally supporting the disk member at a position deviated from a center of the disk member in a radial direction and transmitting a driving force that is input, to the disk member.