Medium feeding device and recording apparatus

A medium feeding device comprising:

• a placing plane on which a medium to be fed is placed;
• a first feeding unit which feeds the medium to be fed which is placed on the placing plane to a downstream side of a feeding direction;
• a second feeding unit which feeds the medium fed by the first feeding unit to a upstream side and a downstream side of the feeding direction on the basis of a feeding direction of the first feeding unit;
• a friction member which is installed at a position of the placing plane which is opposite to the first feeding unit;
• a displacement member which is able to be converted between a first state in which the displacement member protrudes upwardly in a stacked direction of the medium to be fed with respect to the friction member and a second state in which the displacement member retracts downwardly in the stacked direction with respect to the friction member;
• a first arm section having the displacement member;
• a second arm section which is installed at the upstream side of the feeding direction by the first arm section and is able to engage with the first arm section;
• and
• a projection portion which is installed at the second arm section and is able to be converted between a third state in which the projection portion protrudes from the placing plane and a fourth state in which the projection portion retracts downwardly in the stacked direction with respect to the third state,
• wherein the projection portion is biased by a first biasing unit so that the projection portion is in the third state if an external force is not applied, and is in the fourth state by the weight of one sheet of medium to be fed on the projection portion;
• if the projection portion is in the fourth state, engagement of the second arm section and the first arm section is released;
• in the state in which the engagement of the second arm section and the first arm section is released, the displacement member is biased by a second biasing unit so that the displacement member is in the first state if the external force is not applied to the displacement member and the projection portion, and is in the second state by the weight of one sheet of medium to be fed on the displacement member;
• a biasing force generated from the second biasing unit is set to be higher than a biasing force generated from the first biasing unit, and the first arm section engages with the second arm section when the second state is converted into the first state;
• and
• if the projection portion is in the third state, the second arm section engages with the first arm section to maintain the first state of the displacement member.