Work vehicle

1. A work vehicle comprising:

a blade including a lower end;

a shutter attached to the blade, the shutter being capable of being disposed alternatively at a first position at which the shutter protrudes forward from the lower end of the blade and at a second position at which the shutter is farther away from the lower end of the blade than at the first position;

an actuator configured to cause the shutter to move from one to the other between the first position and the second position;

an input operation unit for manually inputting an operation instruction by an operator to the actuator; and

a controller including a timer for measuring time,

the controller being configured to:

receive an input of the manual operation instruction from the input operation unit to move the shutter from the second position to the first position, to cause the shutter to move from the second position to the first position, and

after the controller receives an input from the timer indicating a lapse of a prescribed time period with a point of time when the controller receives the input of the operation instruction as a starting-point for the time detection cause the shutter to move from the first position to the second.

2. The work vehicle according to claim 1 , wherein the controller is configured to be capable of receiving an input of the operation instruction from the input operation unit to move the shutter from the first position to the second position, to cause the shutter to move from the first position to the second position.

3. The work vehicle according to claim 2 , wherein

the input operation unit is configured to be capable of accepting alternatively one of a first operation and a second operation different from the first operation, each for moving the shutter from the second position to the first position, and

the controller is configured to

cause the shutter to move from the first position to the second position in response to reception of an input of the operation instruction from the input operation unit when the first operation is performed, and

cause the shutter to automatically move from the first position to the second position when the second operation is performed.

4. The work vehicle according to claim 3 , wherein

the input operation unit includes a push-button switch, and

the first operation is a short press operation of the push-button switch, and the second operation is a long press operation of the push-button switch.

5. The work vehicle according to claim 1 , wherein a plurality of settings for the prescribed time period are selectable.

6. The work vehicle according to claim 1 , wherein

at the first position the shutter protrudes forward beyond a leading edge of the lower end of the blade.

7. A work vehicle comprising:

a blade including a lower end;

a shutter attached to the blade, the shutter being capable of being disposed alternatively at a first position at which the shutter protrudes forward from the lower end of the blade and at a second position at which the shutter is farther away from the lower end of the blade than at the first position;

an actuator configured to cause the shutter to move from one to the other between the first position and the second position;

an input operation unit for manually inputting an operation instruction by an operator to the actuator;

a sensor configured to detect a traveling distance of the work vehicle after the shutter is moved to the first position; and

a controller,

the controller being configured to:

receive an input of the manual operation instruction from the input operation unit to move the shutter from the second position to the first position, to cause the shutter to move from the second position to the first position, and

after the controller receives an input from the sensor indicating that the work vehicle travels for a prescribed distance with a location of the work vehicle when the controller receives the input of the operation instruction as a starting-point for the distance detection cause the shutter to move from the first position to the second position.

8. The work vehicle according to claim 7 , wherein the controller is configured to be capable of receiving an input of the operation instruction from the input operation unit to move the shutter from the first position to the second position, to cause the shutter to move from the first position to the second position.

9. The work vehicle according to claim 8 , wherein

the input operation unit is configured to be capable of accepting alternatively one of a first operation and a second operation different from the first operation, each for moving the shutter from the second position to the first position, and

the controller is configured to

cause the shutter to move from the first position to the second position in response to reception of an input of the operation instruction from the input operation unit when the first operation is performed, and

cause the shutter to automatically move from the first position to the second position when the second operation is performed.

10. The work vehicle according to claim 9 , wherein

the input operation unit includes a push-button switch, and

the first operation is a short press operation of the push-button switch, and the second operation is a long press operation of the push-button switch.

11. The work vehicle according to claim 7 , wherein a plurality of settings for the prescribed distance are selectable.

12. The work vehicle according to claim 7 , wherein

at the first position the shutter protrudes forward beyond a leading edge of the lower end of the blade.