Liquid circulation device and liquid discharge apparatus including the liquid circulation device

Patent metadata

Field	Value
Publication number	US-11052670-B2
Application number	US-201916677432-A
Country	US
Kind code	B2
Filing date	Nov 7, 2019
Priority date	Nov 13, 2018
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

A liquid circulation device includes a circulation path, a liquid feeding device, and circuitry. The circulation path is configured to circulate a liquid to be supplied to a liquid discharge head of a circulatory type and collected from the liquid discharge head. The liquid feeding device is configured to feed the liquid to circulate the liquid in the circulation path. The circuitry is configured to control an amount of the liquid to be fed by the liquid feeding device, on a basis of discharge information about the liquid to be discharged from the liquid discharge head.

First claim

The invention claimed is:

1. A liquid circulation device comprising:
a circulation path configured to circulate a liquid to be supplied to a liquid discharge head of a circulatory type and collected from the liquid discharge head;
a supply tank configured to collect the liquid of the circulation path, and to supply the liquid to the liquid discharge head;
a collection tank configured to collect the liquid from the liquid discharge head, and to supply the liquid back to the circulation path;
a supply pump configured to pressurize the supply tank to drive the liquid from the supply tank to the liquid discharge head;
a collection pump configured to pressurize the collection tank to drive the liquid from the collection tank into the circulation path;
a first pressure sensor configured to detect a pressure of the supply tank;
a second pressure sensor configured to detect a pressure of the collection tank;
a first liquid feed controller configured to divide image data into a series of regions to be printed in respective periods of time, to acquire information of a discharge amount to be applied to each region, and to determine a first voltage for the supply pump and the collection pump based on the discharge amount for a region;
a second liquid feed controller configured to determine a second voltage for the supply pump and the collection pump based on target pressure values of the supply tank and the collection tank and pressure values detected by the first pressure sensor and the second pressure sensor; and
an adder configured to apply a sum of the first voltage and the second voltage to the supply pump and the collection pump before the liquid discharge head performs a discharge operation on the region to reduce pressure fluctuation of the liquid discharge head.

2. The liquid circulation device according to claim 1 ,
wherein the series of regions are divided in a direction of movement of a discharge target onto which the liquid is to be discharged from the liquid discharge head.

3. The liquid circulation device according to claim 1 ,
wherein the series of regions are divided in a direction of movement of the liquid discharge head.

4. The liquid circulation device according to claim 1 , further comprising
a pressure sensor configured to detect pressure in the circulation path,
wherein the circuitry controls the supply pump and the collection pump based on the pressure detected by the pressure sensor.

5. A liquid discharge apparatus comprising:
a plurality of liquid discharge heads; and
the liquid circulation device according to claim 1 .

6. The liquid discharge apparatus according to claim 5 ,
wherein the plurality of liquid discharge heads is configured to discharge liquid to fabricate a solid object.

Assignees

• Mori Atsushi
• Ricoh Co Ltd

Inventors

• Mori Atsushi

Classifications

• B41J2/175 Primary

  Ink supply systems {; Circuit parts therefor} · CPC title

• B41J2/17596

  Ink pumps, ink valves · CPC title

• B41J2/18 Primary

  Ink recirculation systems · CPC title

• B41J2/185

  Ink-collectors; Ink-catchers · CPC title