Sheet feeding apparatus and image forming apparatus

A sheet feeding apparatus comprising:

• a stacking portion on which a sheet is stacked;
• a pick-up member configured to come into contact with the sheet stacked on the stacking portion to feed the sheet;
• a feed member configured to feed the sheet fed by the pick-up member;
• a drive source configured to generate a driving force;
• an elevating unit configured to raise and lower the stacking portion or the pick-up member with the driving force from the drive source to bring the sheet stacked on the stacking portion and the pick-up member into contact with each other;
• and
• a control unit configured to control the elevating unit,
• wherein the control unit controls the elevating unit, at a timing of when a trailing edge in a feeding direction of a first sheet fed to the pick-up member is upstream of the feed member and downstream of the pick-up member, to bring a second sheet stacked on the stacking portion and to be fed subsequently to the first sheet and the pick-up member into contact each other.

A sheet feeding apparatus comprising:

• a stacking portion on which a sheet is stacked;
• a pick-up member configured to come into contact with the sheet stacked on the stacking portion to feed the sheet;
• a feed member configured to feed the sheet fed by the pick-up member;
• a drive source configured to generate a driving force;
• an elevating unit configured to raise and lower the stacking portion or the pick-up member with the driving force from the drive source to bring the sheet stacked on the stacking portion and the pick-up member into contact with each other;
• and
• a control unit configured to control the elevating unit,
• wherein the elevating unit is configured, after a leading edge in a feeding direction of a first sheet fed by the pick-up member reaches the feed member, to separate the sheet stacked on the stacking portion and the pick-up member from each other, and
• wherein the control unit controls the elevating unit, at a timing of when a trailing edge in the feeding direction of the first sheet fed by the pick-up member is upstream of the feed member and downstream of the pick-up member, to bring a second sheet stacked on the stacking portion and to be fed subsequently to the first sheet and the pick-up member into contact each other.