Recording head unit, image forming apparatus, and line-head module

A recording head unit, comprising:

• a line-head module including a plurality of recording heads to discharge a liquid;
• and
• a main plate to which the line-head module is mounted,
• wherein the line-head module includes:
• a first adjustment portion to adjust a position of the line-head module relative to the main plate in a longitudinal direction of the line-head module;
• and
• a second adjustment portion to adjust a position of the line-head module relative to the main plate in a rotational direction of the line-head module,
• wherein each of the first adjustment portion and the second adjustment portion is provided on an inner side of an outermost periphery of the line-head module in a longitudinal direction of the line-head module and on an inner side of an outermost periphery of the line-head module in a transverse direction of the line-head module,
• wherein the first adjustment portion includes a first moving member movable in the longitudinal direction to protrude from the outermost periphery of the line-head module in the longitudinal direction of the line-head module and the second adjustment portion includes a second moving member movable in the transverse direction to protrude from the outermost periphery of the line-head module in the transverse direction,
• wherein the first adjustment portion further includes a first screw having a tapered end to contact and move the first moving member;
• and
• the second adjustment portion further includes a second screw having a tapered end to contact and move the second moving member,
• wherein each of the first moving member and the second moving member is a C-shaped plate including an expandable hole,
• the first adjustment portion including a first groove extending in the longitudinal direction to movably accommodate the first moving member, and
• the second adjustment portion including a second groove extending in the transverse direction to movably accommodate the second moving member.

A line-head module comprising:

• a plurality of recording heads to discharge a liquid;
• a first adjustment portion to adjust a position of the line-head module in a longitudinal direction of the line-head module;
• and
• a second adjustment portion to adjust a position of the line-head module in a rotational direction of the line-head module,
• wherein each of the first adjustment portion and the second adjustment portion is provided on an inner side of an outermost periphery of the line-head module in a longitudinal direction of the line-head module and on an inner side of an outermost periphery of the line-head module in a transverse direction of the line-head module,
• wherein the first adjustment portion includes a first moving member movable in the longitudinal direction to protrude from the outermost periphery of the line-head module in the longitudinal direction of the line-head module;
• and
• the second adjustment portion includes a second moving member movable in the transverse direction to protrude from the outermost periphery of the line-head module in the transverse direction,
• wherein the first adjustment portion further includes a first screw having a tapered end to contact and move the first moving member and the second adjustment portion further includes a second screw having a tapered end to contact and move the second moving member,
• wherein each of the first moving member and the second moving member is a ball,
• the first adjustment portion including a first hole extending in the longitudinal direction to movably accommodate the first moving member, and
• the second adjustment portion including a second hole extending in the transverse direction to movably accommodate the second moving member.