# US 11,110,718 B2 · Liquid ejecting apparatus

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,110,718 B2
- Document ID: US11110718B2
- Status: Granted
- Kind: B2
- Application number: 16/725,275
- Filed: 2019-12-23
- Published: 2020-07-02
- Granted: 2021-09-07
- Earliest claimed: 2018-12-26
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Hiroyuki Nakamura; Ayumi Yokoo; Kazuhiko Sato
- Web page: https://patentgrep.com/patent/US11110718B2

## CPC

- B41J 2/17596: {Ink pumps, ink valves}
- B41J 2/14201: {Structure of print heads with piezoelectric elements}
- B41J 2/175: Ink supply systems {; Circuit parts therefor}
- B41J 2002/14306: {Flow passage between manifold and chamber}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A liquid ejecting apparatus includes a liquid ejecting head configured to eject a liquid, a liquid supply flow path configured to supply the liquid from a liquid container containing the liquid to the liquid ejecting head, a pressurizing portion pressurizing an inside of the liquid supply flow path, and an solenoid valve which is provided in the liquid supply flow path and which opens the liquid supply flow path during energization and closes the liquid supply flow path during de-energization, in which open and closed states of the solenoid valve are forcibly switched in accordance with a pressure change by the pressurizing portion.

## Claims

### Claim 1

A liquid ejecting apparatus comprising:
a liquid ejecting head configured to eject a liquid;
a liquid supply flow path configured to supply the liquid from a liquid container containing the liquid to the liquid ejecting head;
a pressurizing portion pressurizing an inside of the liquid supply flow path;
a solenoid valve which is provided in the liquid supply flow path and which opens the liquid supply flow path during energization and closes the liquid supply flow path during de-energization; and
a power supply circuit for energizing the solenoid valve, wherein
the pressurizing portion has a displacing portion configured to be displaced in accordance with a pressure change,
the power supply circuit has a switch switching between a connection and a disconnection of the power supply circuit, and
the displacing portion moves the switch to disconnect the power supply circuit so that the solenoid valve in open state is forcibly switched to closed state.

### Claim 2 (depends on 1)

The liquid ejecting apparatus according to claim 1, wherein
the pressurizing portion pressurizes the inside of the liquid supply flow path with air.

### Claim 3 (depends on 1)

The liquid ejecting apparatus according to claim 1, wherein
the solenoid valve in the open state is forcibly switched to the closed state by the displacement of the displacing portion when a pressure in the pressurizing portion is lower than a predetermined pressure.

### Claim 4 (depends on 1)

The liquid ejecting apparatus according to claim 1, wherein
the solenoid valve in the open state is forcibly switched to the closed state by the displacement of the displacing portion when a pressure in the pressurizing portion is higher than a predetermined pressure.

### Claim 5 (depends on 1)

The liquid ejecting apparatus according to claim 1, further comprising:
an atmosphere opening valve configured to communicate an inside of the pressurizing portion with atmosphere, wherein
the atmosphere opening valve is switched from a closed state to an open state by the displacement of the displacing portion when the pressure in the pressurizing portion is higher than a predetermined pressure.

### Claim 6

A liquid ejecting apparatus comprising:
a liquid ejecting head configured to eject a liquid;
a liquid supply flow path configured to supply the liquid from a liquid container containing the liquid to the liquid ejecting head;
a pressurizing portion pressurizing an inside of the liquid supply flow path;
a solenoid valve which is provided in the liquid supply flow path and which opens the liquid supply flow path during energization and closes the liquid supply flow path during de-energization; and
a power supply circuit for energizing the solenoid valve, wherein
the liquid supply flow path has a displacing portion configured to be displaced in accordance with a pressure change in the liquid supply flow path pressurized by the pressurizing portion,
the power supply circuit has a switch switching between a connection and a disconnection of the power supply circuit, and
the displacing portion moves the switch to disconnect the power supply circuit so that the solenoid valve in open state is forcibly switched to closed state.

### Claim 7 (depends on 6)

The liquid ejecting apparatus according to claim 6, wherein
the solenoid valve in the open state is forcibly switched to the closed state by the displacement of the displacing portion when the pressure in the liquid supply flow path is lower than a predetermined pressure.

### Claim 8 (depends on 6)

The liquid ejecting apparatus according to claim 6, wherein
the solenoid valve in the open state is forcibly switched to the closed state by the displacement of the displacing portion when the pressure in the liquid supply flow path is higher than a predetermined pressure.

### Claim 9 (depends on 6)

The liquid ejecting apparatus according to claim 6, further comprising:
an atmosphere opening valve configured to communicate the inside of the pressurizing portion, which pressurizes the inside of the liquid supply flow path with air, with atmosphere, wherein
the atmosphere opening valve is switched from the closed state to the open state by the displacement of the displacing portion when the pressure in the liquid supply flow path is higher than a predetermined pressure.