# US 8,465,125 B2 · Image forming apparatus with a structure for preventing bubbles from entering recording head or remaining in a fluid supply channel

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- Number: US 8,465,125 B2
- Document ID: US8465125B2
- Status: Granted
- Kind: B2
- Application number: 12/851,155
- Filed: 2010-08-05
- Published: 2011-03-03
- Granted: 2013-06-18
- Earliest claimed: 2009-08-27
- Assignees: Ricoh Company, Ltd.
- Applicants: Kengo Tsubaki; Tatsuro Watanabe
- Inventors: Kengo Tsubaki; Tatsuro Watanabe
- Web page: https://patentgrep.com/patent/US8465125B2

## CPC

- B41J 2/16588: {Print heads movable towards the cleaning unit}
- B41J 2/175: Ink supply systems {; Circuit parts therefor}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

An image forming apparatus includes plural heads each having a nozzle configured to discharge a droplet of a recording fluid; a distributing member to which the plural heads are attached, the distributing member having an inlet portion, a supply channel portion, and a common fluid chamber communicated with the inlet portion and configured to supply the recording fluid to the plural heads; and a fluid containing unit configured to supply the recording fluid to the distributing member via the inlet portion and the supply channel portion. The distributing member includes a flow-directing wall disposed between the supply channel portion and the common fluid chamber.

## Claims

### Claim 1

An image forming apparatus comprising:
plural heads each having a nozzle configured to discharge a droplet of a recording fluid;
a distributing member to which the plural heads are attached, the distributing member having an inlet portion, a supply channel portion, and a common fluid chamber communicated with the supply channel portion and configured to supply the recording fluid to the plural heads; and
a fluid containing unit configured to supply the recording fluid to the distributing member via the inlet portion and the supply channel portion,
wherein the supply channel portion includes a flow-directing wall configured to direct a flow of the recording fluid upward before the recording fluid enters the common fluid chamber, and
wherein the supply channel portion includes a wall surface made of a flexible material,
the image forming apparatus further comprising a resilient member configured to bias the wall surface in an outward direction.

### Claim 2 (depends on 1)

The image forming apparatus according to claim 1, wherein the common fluid chamber includes an inclined portion having an inclined surface that slopes down from an exit of the inlet portion.

### Claim 3 (depends on 1)

The image forming apparatus according to claim 1, wherein the inlet portion includes a sloping wall inclined such that a cross-sectional area of the inlet portion increases gradually toward an exit of the inlet portion.

### Claim 4 (depends on 1)

The image forming apparatus according to claim 1, wherein
the distributing member has a casing in which the common fluid chamber is formed, the plural heads are integrally formed on a base of the distributing member along a longitudinal direction of the distributing member, and wherein
the common fluid chamber has an inclined top member and distributes the recording fluid along the longitudinal direction of the distributing member.

### Claim 5 (depends on 1)

The image forming apparatus according to claim 1, wherein the inlet portion of the distributing member is disposed on an end of the distributing member in a longitudinal direction of the distributing member, and the recording fluid flows into the common fluid chamber through the supply channel portion from the inlet portion.

### Claim 6 (depends on 1)

The image forming apparatus according to claim 1, wherein the distributing member further ncludes a bubble discharge opening formed above the supply channel portion of the distributing member.

### Claim 7 (depends on 1)

The image forming apparatus according to claim 1, wherein
the distributing member further includes supply openings for supplying the recording fluid to the plural heads, and the supply channel portion of the distributing member is disposed lower than the supply openings, and wherein
the inlet portion of the distributing member is disposed lower than the common fluid chamber and nozzle surfaces of the plural heads.

### Claim 8 (depends on 1)

The image forming apparatus according to claim 1, wherein the supply channel portion of the distributing member further includes an upper sloping wall facing the flow-directing wall, and the supply channel portion extends upward toward the common fluid chamber at an angle and with an increasing cross-sectional area.

### Claim 9 (depends on 1)

The image forming apparatus according to claim 1, wherein the inlet portion of the distributing member extends upward as the inlet portion connects to the supply channel portion with an angle of inclination.