Patent ID: 9663311
Date: 2017-05-30
CPC Classifications: B65H,G03G

Claim:
1. A sheet feed device comprising: a device main body; a sheet feed cassette inserted and attached to the device main body in a predetermined attachment direction and including a sheet storage portion and a wall portion, the sheet storage portion storing a sheet, the wall portion standing upright at a position more on a front side in the attachment direction than the sheet storage portion; a sheet conveyance path provided in the device main body and configured to guide the sheet stored in the sheet storage portion into the device main body from an entrance formed more on the front side in the attachment direction than the wall portion; a sheet feed roller disposed at a central portion of the device main body in a sheet width direction crossing the attachment direction, on a side of the entrance of the sheet conveyance path and configured to feed the sheet into the sheet conveyance path; a retard roller disposed to face the sheet feed roller in the device main body and, together with the sheet feed roller, forming a sheet feed nip portion through which the sheet is passed; a support unit disposed in the device main body and supporting the retard roller; and a pair of lock mechanisms supported by the support unit so as to face the wall portion of the sheet feed cassette, the lock mechanisms respectively disposed on both sides of the retard roller in the sheet width direction and configured to lock the sheet feed cassette attached to the device main body and position the sheet feed cassette in the attachment direction, wherein the pair of lock mechanisms respectively include: the sheet feed cassette includes a pair of projection portions that project from the wall portion in the attachment direction, when the sheet feed cassette is attached to the device main body, the pair of projection portions are engaged with the pair of lock pieces, thereby the sheet feed cassette is locked, the projection portions respectively include: the lock pieces are disposed above the projection portions and respectively include: when the sheet feed cassette is attached to the device main body, the first abutting surfaces respectively abut on the second abutting surfaces and push up the lock pieces, and the lock pieces are pivoted upward around the fulcrum portion against a biasing force of the spring members, thereby the first abutting surfaces pass the second abutting surfaces, and then the lock pieces are pivoted downward by the biasing force of the spring members, thereby the second engaging surfaces closely contact the first engaging surfaces, thereby the projection portions are engaged with the lock pieces.