# US 10,864,758 B2 · Recording head unit, image forming apparatus, and line-head module

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- Number: US 10,864,758 B2
- Document ID: US10864758B2
- Status: Granted
- Kind: B2
- Application number: 16/517,753
- Filed: 2019-07-22
- Published: 2020-01-30
- Granted: 2020-12-15
- Earliest claimed: 2018-07-30
- Assignees: Ricoh Company, Ltd.
- Applicants: Takeshi Miyazaki
- Inventors: Takeshi Miyazaki
- Web page: https://patentgrep.com/patent/US10864758B2

## CPC

- B41J 25/001: {Mechanisms for bodily moving print heads or carriages parallel to the paper surface}
- B41J 25/003: {for changing the angle between a print element array axis and the printing line, e.g. for dot density changes}
- B41J 2202/21: Line printing
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A recording head unit includes 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. 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.

## Claims

### Claim 1

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 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.

### Claim 2 (depends on 1)

The recording head unit of claim 1,
wherein the line-head module includes at least two fixed portions to fix the line-head module to the main plate,
wherein one of the at least two fixed portions is fixed to the first adjustment portion, and another one of the at least two fixed portions is fixed to the second adjustment portion.

### Claim 3 (depends on 1)

The recording head unit of claim 1,
wherein the first adjustment portion and the second adjustment portion are arranged symmetrically about a center of the line-head module in a plan view of the line-head module.

### Claim 4 (depends on 1)

An image forming apparatus comprising the recording head unit of claim 1.

### Claim 5

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.

### Claim 6 (depends on 5)

The recording head unit of claim 5,
wherein the line-head module includes at least two fixed portions to fix the line-head module to the main plate,
wherein one of the at least two fixed portions is fixed to the first adjustment portion, and another one of the at least two fixed portions is fixed to the second adjustment portion.

### Claim 7 (depends on 5)

The recording head unit according to claim 5,
wherein the first adjustment portion and the second adjustment portion are arranged symmetrically about a center of the line-head module in a plan view of the line-head module.

### Claim 8 (depends on 5)

An image forming apparatus comprising the recording head unit of claim 5.

### Claim 9

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.

### Claim 10 (depends on 9)

The line-head module of claim 9,
wherein the line-head module includes at least two fixed portions to fix the line-head module to the main plate,
wherein one of the at least two fixed portions is fixed to the first adjustment portion, and another one of the at least two fixed portions is fixed to the second adjustment portion.

### Claim 11 (depends on 9)

The line-head module of claim 9,
wherein the first adjustment portion and the second adjustment portion are arranged symmetrically about a center of the line-head module in a plan view of the line-head module.