Head attachment member, liquid ejection device, and head attachment method

A head attachment method for placing a head attachment member, to which a plurality of liquid ejection heads is attached, with respect to a support drum for supporting an ejection-receiving medium and rotating about a shaft, the head attachment member including a pair of plate-shaped members each having an attachment surface to which a plurality of head groups each including the liquid ejection heads is attached and a back surface extending parallel to the attachment surface with end parts of the plate-shaped members being connected to each other so as to be able to rotate about a hinge part so that an angle formed by the attachment surfaces is adjustable, the head attachment method comprising:

• retaining the head attachment member so that the back surfaces are in contact with a horizontal surface and the attachment surfaces are horizontal;
• placing/fixing the liquid ejection heads in alignment with respect to the head attachment member while moving an imaging unit of an alignment device horizontally above the head attachment member;
• and
• rotating the plate-shaped members about the hinge part and adjusting the angle formed by the attachment surfaces so that each of the attachment surfaces is parallel to a line tangent to a peripheral surface of the support drum at an intersection point of the peripheral surface of the support drum with a line segment formed by connecting a center of the support drum and a center between the head groups adjacent in the rotation direction of the support drum attached to the plate-shaped member, and subsequently fixing the head attachment member with respect to the support drum.