Power transmission structure of media separation unit

1 . A power transmission structure of a media separation unit, the power transmission structure comprising:

a pickup pulley and a feed pulley that are spaced apart;

a media separation belt configured to travel along the pickup pulley and the feed pulley, grip and convey media, and have a slope that changes due to contact with a bill press configured to support the media and move upward or downward at a lower side of the pickup pulley;

a motor configured to provide a driving force for the media separation belt to rotate in a first direction or a second direction opposite to the first direction;

at least one relay gear configured to transmit the driving force of the motor;

a swing arm configured to swing in a first rotational direction and a second rotational direction within a predetermined angle range in conjunction with rotation of the at least one relay gear;

a swing gear configured to be connected to the swing arm and rotate in conjunction with the rotation of the at least one relay gear to transmit power for the swing arm to swing; and

a clutch gear configured to intermittently be coupled to or released from the swing gear according to a swing direction of the swing arm and configured to transmit power to the pickup pulley through a connection belt, wherein a slope of the connection belt changes in conjunction with a change in a slope of the media separation belt.

2 . The power transmission structure of claim 1 , wherein:

when the swing arm swings in a first rotational direction and the swing gear is separated from the clutch gear, the driving force of the motor is not transmitted to the pickup pulley; and

when the swing arm swings in a second rotational direction opposite to the first rotational direction and the swing gear is coupled to the clutch gear, the driving force of the motor is transmitted to the pickup pulley.

3 . The power transmission structure of claim 1 , wherein:

a first side portion of the swing arm is coupled to a rotating shaft of the at least one relay gear; and

the swing gear is rotatably coupled to a second side portion of the swing arm in a state in which the swing gear is coupled to the at least one relay gear.

4 . The power transmission structure of claim 2 , wherein a leaf spring configured to apply a predetermined frictional force is interposed between the swing arm and the swing gear, and the swing arm swings in conjunction with rotation of the swing gear caused by the rotation of the at least one relay gear.

5 . The power transmission structure of claim 1 , wherein:

the motor provides a deposit direction driving force by which the media separation belt is rotated in the first rotational direction and a withdrawal direction driving force by which the media separation belt is rotated in the second rotational direction;

the driving force of the motor is transmitted to the feed pulley through the at least one relay gear; and

a one-way bearing configured to transmit the deposit direction driving force of the motor to the feed pulley and block the withdrawal direction driving force of the motor so that it is not transmitted to the feed pulley is coupled between the feed pulley and the rotating shaft of the feed pulley.

6 . The power transmission structure of claim 5 , wherein:

when the swing arm swings in the first rotational direction and the swing gear is separated from the clutch gear due to driving of the motor in a deposit direction, the driving force of the motor is transmitted to the feed pulley, and the feed pulley is driven to rotate due to an action of the one-way bearing; and

when the swing arm swings in the second rotational direction and the swing gear is coupled to the clutch gear due to driving of the motor in a withdrawal direction, the driving force of the motor is transmitted to the pickup pulley, the pickup pulley is driven to rotate, and the feed pulley idly rotates due to the action of the one-way bearing.

7 . The power transmission structure of claim 1 , wherein, for limiting a swing angle of the swing arm, the power transmission structure further comprises:

a stopper protrusion formed on the at least one relay gear; and

a frame in which a stopper hole having a circular arc shape, into which the stopper protrusion is inserted, is formed.

8 . The power transmission structure of claim 1 , wherein the at least one relay gear includes a first relay gear to which the swing arm is coupled, a second relay gear coupled to a first side of the first relay gear, and a third relay gear coupled to a second side of the second relay gear; and

wherein the third relay gear and the feed pulley are coupled to a common rotating shaft.

9 . The power transmission structure of claim 1 , wherein:

a clutch pulley is coupled to a rotating shaft of the clutch gear;

a connection pulley is coupled to a rotating shaft of the pickup pulley; and

the connection belt is provided to travel along the clutch pulley and the connection pulley.

10 . The power transmission structure of claim 9 , wherein, in conjunction with upward or downward movement of the bill press, a slope of the media separation belt is changed due to the media separation belt vertically rotating about the rotating shaft of the feed pulley, and a slope of the connection belt is changed due to the connection belt vertically rotating about the rotating shaft of the clutch gear.