Ink jet printer

Patent metadata

Field	Value
Publication number	US-12472746-B2
Application number	US-202318378814-A
Country	US
Kind code	B2
Filing date	Oct 11, 2023
Priority date	Oct 28, 2022
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

To prevent a failure of an ink jet printer due to ink clogging in a hollow needle and the vicinity thereof. A continuous ink jet printer includes: an ink tank that stores ink and a solvent as a printing ink; a printing head that performs printing with the printing ink; an ink hollow needle that accesses the ink in an ink cartridge when an ink reservoir receives the ink cartridge; a first ink tube that causes the ink to flow from the ink hollow needle to the ink tank; and a supply control section that executes suction control to generate a flow from the ink hollow needle toward the first ink tube when the ink is taken out from the ink cartridge received in the ink reservoir, and executes blowing control to generate a flow from the first ink tube toward the ink hollow needle when reverse-flow cleaning is performed.

First claim

What is claimed is:

1 . A continuous ink jet printer comprising:
an ink reservoir that detachably receives an ink cartridge in which ink is contained; a solvent reservoir that detachably receives a solvent cartridge in which a solvent is contained; an ink tank that stores, as a printing ink, the ink from the ink cartridge received in the ink reservoir and the solvent from the solvent cartridge received in the solvent reservoir; a printing head that performs printing with the printing ink from the ink tank; a hollow needle body that accesses the ink in the ink cartridge when the ink reservoir receives the ink cartridge; a connecting portion in which a flow channel connected to the hollow needle body is formed, the connecting portion fixing the hollow needle body to the ink reservoir; an ink flowing tube that connects the ink tank and the connecting portion and causes the ink to flow from the connecting portion to the ink tank; and a supply control section that executes first control to generate a flow from the connecting portion to the ink flowing tube in a predetermined direction and executes second control to generate a reverse-flow from the ink flowing tube to the connecting portion in an opposite direction to the predetermined direction.

2 . The ink jet printer according to claim 1 , wherein the ink is made of a pigment ink.

3 . The ink jet printer according to claim 1 , further comprising:
a suction pump that is arranged in a middle of the ink flowing tube and configured to perform suction to generate the flow from the connecting portion to the ink flowing tube; a joining section that is arranged in the ink flowing tube between the connecting porting and the suction pump and causes the solvent or the ink to join in the ink flowing tube; and an on-off valve that is arranged in the ink flowing tube between the joining section and the suction pump and opens and closes a flow channel of the ink flowing tube, wherein the supply control section executes the first control by bringing the on-off valve into an open state and operating the suction pump when the ink is taken out from the ink cartridge received in the ink reservoir, and executes the second control by bringing the on-off valve into a closed state and supplying the solvent or the ink via the joining section when the reverse-flow cleaning is performed on the path of the flow.

4 . The ink jet printer according to claim 3 , further comprising:
a solvent flowing tube that causes the solvent to flow in the solvent cartridge to the joining section when the solvent reservoir receives the solvent cartridge; a solvent pump that is arranged in a middle of the solvent flowing tube and operated to generate a flow from the solvent flowing tube to the connecting portion via the joining section and the ink flowing tube; and a second on-off valve that is arranged in the solvent flowing tube between the joining section and the solvent pump and opens and closes a flow channel of the solvent flowing tube, wherein the supply control section executes the first control by bringing the on-off valve into the open state, bringing the second on-off valve into a closed state, and operating the suction pump when the ink is taken out from the ink cartridge received in the ink reservoir, and executes the second control by bringing the on-off valve into the closed state, bringing the second on-off valve to an open state, and operating the solvent pump when the reverse-flow cleaning is performed on the path of the flow.

5 . The ink jet printer according to claim 3 , further comprising
a second ink flowing tube that connects the ink tank and the joining section and causes the printing ink to flow from the ink tank to the joining section; an ink pump that is arranged in a middle of the second ink flowing tube and operated to generate a flow from the second ink flowing tube to the connecting portion via the joining section and the ink flowing tube; and a third on-off valve that is arranged in the second ink flowing tube between the joining section and the ink pump and opens and closes a flow channel of the second ink flowing tube, wherein the supply control section executes the first control by bringing the on-off valve into the open state, bringing the third on-off valve into a closed state, and operating the suction pump when the ink is taken out from the ink cartridge received in the ink reservoir, and executes the second control by bringing the on-off valve into the closed state, bringing the third on-off valve to an open state, and operating the ink pump when the reverse-flow cleaning is performed on the path of the flow.

6 . The ink jet printer according to claim 3 , further comprising
a detector that detects a blocked state in the connecting portion and a blocked state in the ink flowing tube between the connecting portion and the joining section, wherein the supply control section starts the second control based on a detection result of the detector.

7 . The ink jet printer according to claim 1 , further comprising
a switch electrically connected to the supply control section, wherein the supply control section starts the second control when the switch is operated.

8 . The ink jet printer according to claim 7 , wherein the supply control section starts the second control when the switch is operated, regardless of whether or not the ink cartridge received in the ink reservoir contains the ink.

9 . The ink jet printer according to claim 1 , further comprising
a notification section that notifies a user of information, wherein the supply control section executes the second control over a predetermined period, and causes the notification section to notify that the second control is terminated after a lapse of the predetermined period.

10 . The ink jet printer according to claim 1 , further comprising
a display section that displays information to a user, wherein the display section displays guidance information for guiding the user to stir the ink cartridge to be received in the ink reservoir when the second control by the supply control section is terminated.

11 . The ink jet printer according to claim 1 , wherein the first control is executed so that the ink is taken out from the ink cartridge received in the ink reservoir, and the second control is executed so that an obstruction clogged in the ink flowing tube or in the connecting portion is pushed out.

12 . A continuous ink jet printer comprising:
an ink reservoir that detachably receives an ink cartridge in which ink is contained; a solvent reservoir that detachably receives a solvent cartridge in which a solvent is contained; an ink tank that stores, as a printing ink, the ink from the ink cartridge received in the ink reservoir and the solvent from the solvent cartridge received in the solvent reservoir; a printing head that performs printing with the printing ink from the ink tank; a hollow needle body that accesses the ink in the ink cartridge when the ink reservoir receives the ink cartridge; a connecting portion in which a flow channel connected to the hollow needle body is formed, the connecting portion fixing the hollow needle body to the ink reservoir; an ink flowing tube that connects the ink tank and the connecting portion, and causes the ink to flow from the connecting portion to the ink tank; a supply control section that executes first control to generate a flow from the connecting portion to the ink flowing tube in a predetermined direction, and executes second control to generate a reverse-flow from the ink flowing tube to the connecting portion in an opposite direction to the predetermined dir

Assignees

• Keyence Co Ltd

Inventors

• Hashimoto Hajime
• Yamakawa Hideki

Classifications

• B41J2/17513

  Inner structure · CPC title

• B41J2/17596 Primary

  Ink pumps, ink valves · CPC title

• B41J2/17523

  Ink connection · CPC title

• B41J2/17509

  Whilst mounted in the printer · CPC title

• B41J2/175

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