JP2018140520A5

JP2018140520A5 -

Info

Publication number: JP2018140520A5
Application number: JP2017035093A
Authority: JP
Filing date: 2017-02-27
Publication date: 2020-04-02
Anticipated expiration: 2037-02-27

Description

本発明の液体吐出装置は、液体を吐出する吐出口を有する液体吐出ヘッドと、液体吐出ヘッドに液体を供給する液体供給手段と、を有し、液体供給手段は、液体吐出ヘッドにおいて吐出口が形成されている吐出口面よりも重力方向上方に配置されて液体吐出ヘッドに供給する液体を貯留するサブタンクと、サブタンクと液体吐出ヘッドとを接続する供給流路と、吐出口における液体の圧力を調整する圧力調整手段と、サブタンクの底面に接続され、サブタンクの内部の液体を排出可能な、供給流路とは異なる排出流路と、排出流路から排出された液体を収容する液体収容部と、液体収容部の内部の液体をサブタンクに供給する送液手段と、を有することを特徴とする。 The liquid ejection apparatus of the present invention includes a liquid ejection head having an ejection port for ejecting a liquid, and a liquid supply unit for supplying the liquid to the liquid ejection head, wherein the liquid ejection unit has a discharge port in the liquid ejection head. A sub-tank disposed above the formed discharge port surface in the direction of gravity to store liquid to be supplied to the liquid discharge head, a supply flow path connecting the sub-tank and the liquid discharge head, and a pressure of the liquid at the discharge port. A pressure adjusting means for adjusting, a discharge flow path different from the supply flow path, which is connected to the bottom surface of the sub tank and capable of discharging the liquid inside the sub tank, and a liquid storage section for storing the liquid discharged from the discharge flow path. Liquid supply means for supplying the liquid inside the liquid storage section to the sub-tank.

Claims

A liquid discharge head having a discharge port for discharging liquid,
Liquid supply means for supplying the liquid to the liquid ejection head,
Has,
The liquid supply means,
A sub-tank which is disposed above the ejection port surface where the ejection port is formed in the liquid ejection head in the direction of gravity and stores liquid to be supplied to the liquid ejection head;
A supply flow path connecting the sub tank and the liquid ejection head,
Pressure adjusting means for adjusting the pressure of the liquid at the discharge port,
A discharge flow path different from the supply flow path, which is connected to a bottom surface of the sub tank and is capable of discharging the liquid inside the sub tank,
A liquid storage unit that stores the liquid discharged from the discharge flow path,
A liquid sending unit that supplies a liquid inside the liquid storage unit to the sub tank,
A liquid ejection device comprising:

The liquid ejecting apparatus according to claim 1, wherein the sub-tank is housed in an airtight housing, and the pressure adjustment unit has a pressure adjustment mechanism for adjusting the pressure of gas inside the housing.

The pressure adjusting unit includes a valve provided in the supply flow path, and a pressure sensor that detects a pressure of the supply flow path at a position downstream of the valve. The liquid ejection device according to claim 1, wherein the valve is controlled.

4. The pressure adjusting device according to claim 1, wherein the pressure adjusting unit further includes a liquid level sensor that measures a liquid level of the sub tank, and controls to maintain the liquid level of the sub tank constant. 5. The liquid ejection device according to claim 1.

The pressure adjusting means comprises a partition member defining the liquid level in the sub tank, the discharge port between the lower end of the front Symbol partition member and the bottom surface of the housing is formed, according to claim 1 Liquid ejection device.

The liquid ejection device according to any one of claims 1 to 5, wherein a self-holding valve that is opened during operation of the liquid ejection device and closed when the liquid ejection device is stopped is provided in the discharge channel. apparatus.

A liquid discharge head having a discharge port for discharging liquid,
Liquid supply means for supplying the liquid to the liquid ejection head,
Has,
The liquid supply means,
A first sub-tank that is disposed above a discharge port surface in which the discharge port is formed in the liquid discharge head and that stores liquid to be supplied to the liquid discharge head,
A supply flow path connecting the first sub-tank and the liquid ejection head,
A second sub-tank disposed above the discharge port surface in the direction of gravity to store liquid collected from the liquid discharge head;
A recovery flow path connecting the second sub-tank and the liquid ejection head,
The pressure of the liquid at the discharge port is adjusted, and the liquid flows and circulates from the first sub-tank to the second sub-tank via the supply flow path, the liquid discharge head, and the recovery flow path. Pressure adjusting means for forming a pressure difference;
A first discharge flow path different from the supply flow path, the first discharge flow path being connected to a bottom surface of the first sub-tank and capable of discharging liquid inside the first sub-tank;
A second discharge channel different from the supply channel, the second discharge channel being connected to a bottom surface of the second sub-tank and capable of discharging a liquid inside the second sub-tank;
A liquid storage unit that stores liquid discharged from at least one of the first discharge channel and the second discharge channel;
A liquid sending unit that supplies a liquid inside the liquid storage unit to the sub tank,
A liquid ejection device comprising:

The liquid ejecting apparatus according to claim 7, wherein the first sub-tank and the second sub-tank are housed in a housing, and the pressure adjusting unit has a pressure adjusting mechanism for adjusting a pressure of gas inside the housing.

The liquid ejecting apparatus according to claim 8, wherein the pressure difference is formed by a head difference between a liquid level of the first sub-tank and a liquid level of the second sub-tank.

A first partition member that regulates a liquid level of the first sub-tank; and a liquid level height of the second sub-tank that is lower than a liquid level of the first sub-tank. The liquid ejection device according to claim 9, further comprising: a second partition member that performs the operation.

The liquid ejection device according to claim 10, wherein the first partition member partitions the first sub-tank and the second sub-tank.

The formed between the lower end of the front Symbol first partition member and the first discharge port formed between the bottom surface of the housing, a lower end and a bottom surface of the housing before Symbol second partition member and a second outlet, the first sub-tank and said second sub-tank are communicated with each other through the first discharge port, a liquid ejecting apparatus according to claim 11.

The pressure adjusting means further includes a first liquid level sensor for measuring the liquid level of the first sub tank and a second liquid level sensor for measuring the liquid level of the second sub tank, The liquid ejecting apparatus according to claim 9, wherein control is performed to maintain the liquid level height of the first sub-tank constant and to maintain the liquid level height of the second sub-tank constant.

14. The second discharge channel according to claim 7, wherein a first self-holding valve that is opened during operation of the liquid discharge device and closed when the liquid discharge device is stopped is provided in the second discharge passage. Item 6. The liquid ejection device according to Item 1.

A first self-holding valve, which is opened during operation of the liquid ejection device and closed when the liquid ejection device is stopped, is provided in the second discharge channel, and is opened during operation of the liquid ejection device. The liquid discharge device according to any one of claims 7 to 11, wherein a second self-holding valve that is closed when the liquid discharge device is stopped is provided in the first discharge flow path.

The liquid ejection device according to claim 1, further comprising a main tank that supplies a liquid to the liquid storage unit.