Head assembly and inkjet recording apparatus

1. A head assembly, comprising:

a base member;

recording heads each of which is configured to eject ink;

coupling members that couple the recording heads to the base member;

at least one first rotating shaft member that serves as a rotating shaft of at least one recording head of the recording heads; and

at least one first angle adjustment mechanism configured to rotate the at least one recording head about the at least one first rotating shaft member as a rotation center, wherein

each of the recording heads includes a first end and a second end on an opposite side from the first end,

the coupling members include:

first coupling members that couple respective first ends of the recording heads to the base member; and

second coupling members that couple respective second ends of the recording heads to the base member,

the at least one first rotating shaft member is provided for, of the first coupling members, at least one first coupling member corresponding to the at least one recording head, and

the at least one first angle adjustment mechanism is provided for, of the second coupling members, at least one second coupling member corresponding to the at least one recording head.

2. The head assembly according to claim 1 , wherein

the at least one first angle adjustment mechanism includes

a pressing member that is in contact with the second end of the at least one recording head and configured to rotate the at least one recording head in a first rotation direction; and

an urging member configured to urge the second end of the at least one recording head in a second rotation direction opposite to the first rotation direction.

3. The head assembly according to claim 1 , comprising a first end and a second end on an opposite side from the first end, wherein

the recording heads are positioned such that the respective first ends of the recording heads are closer to the first end of the head assembly than the respective second ends of the recording heads.

4. An inkjet recording apparatus, comprising:

the head assembly according to claim 1 ; and

an installation base in which the head assembly is installed.

5. The inkjet recording apparatus according to claim 4 , comprising:

a second rotating shaft member that is provided for the installation base and functions as a rotating shaft of the head assembly; and

a second angle adjustment mechanism that is provided for the installation base and configured to rotate the head assembly about the second rotating shaft member as a rotation center.

6. The inkjet recording apparatus according to claim 5 , wherein:

the head assembly includes a first end and a second end on an opposite side from the first end;

the second rotating shaft is located at a side of the first end of the head assembly; and

the second angle adjustment mechanism is located at a side of the second end of the head assembly.

7. The inkjet recording apparatus according to claim 5 , wherein

the second angle adjustment mechanism includes:

a third rotating shaft member; and

an angle adjustment member that is rotatable about the third rotating shaft member as a rotation center,

the angle adjustment member includes a first engagement part that engages with the head assembly,

the head assembly includes a head engagement part that engages with the first engagement part,

the angle adjustment member is configured to cause the first engagement part to push the head engagement part according to rotation of the angle adjustment member about the third rotating shaft member as the rotation center in a first rotation direction, and

the head assembly is configured to rotate about the second rotating shaft as a rotation center according to the first engagement part pushing the head engagement part.

8. The inkjet recording apparatus according to claim 7 , wherein

the second angle adjustment mechanism includes a pressing member that engages with the angle adjustment member,

the angle adjustment member includes a second engagement part that engages with the pressing member of the second angle adjustment mechanism, and

the second angle adjustment mechanism is configured to cause the angle adjustment member to rotate in the first rotation direction according to the pressing member of the second angle adjustment mechanism pushing the second engagement part.

9. The inkjet recording apparatus according to claim 8 , wherein

the second angle adjustment mechanism includes a coupling mechanism that is coupled to the pressing member of the second angle adjustment mechanism, and

the coupling mechanism is configured to move the pressing member of the second angle adjustment mechanism so that the pressing member of the second angle adjustment mechanism pushes the second engagement part.

10. The inkjet recording apparatus according to claim 9 , wherein

the coupling mechanism includes an operation member that allows a worker to operate, and

the coupling mechanism is configured to move the pressing member of the second angle adjustment mechanism according to operation of the operation member by the worker.

11. The inkjet recording apparatus according to claim 10 , wherein

the installation base includes a side wall;

the angle adjustment member is placed inside the side wall; and

the operation member is placed outside the side wall.

12. The inkjet recording apparatus according to claim 7 , wherein

the second angle adjustment mechanism includes an urging member that urges the angle adjustment member such that the angle adjustment member is rotated in a second rotation direction, and

the second rotation direction is a rotation direction opposite to the first rotation direction.

13. The inkjet recording apparatus according to claim 7 , wherein

the second angle adjustment mechanism includes a regulation member that regulates rotation of the angle adjustment member.