# US 11,077,665 B2 · Drop-on-demand print head cleaning mechanism and method

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- Number: US 11,077,665 B2
- Document ID: US11077665B2
- Status: Granted
- Kind: B2
- Application number: 16/795,048
- Filed: 2020-02-19
- Published: 2020-06-11
- Granted: 2021-08-03
- Earliest claimed: 2017-08-31
- Assignees: Entrust Corporation
- Applicants: Entrust Corporation
- Inventors: Milo B. Squires; Kyle Johnson; Eugene T. Tennis
- Web page: https://patentgrep.com/patent/US11077665B2

## CPC

- B41J 2/16532: {by applying vacuum only}
- B41J 2/16514: {creating a distance between cap and printhead, e.g. for suction or pressurising}
- B41J 2/16535: {using wiping constructions (B41J2/16552 takes precedence)}
- B41J 2/16552: {using cleaning fluids}
- B41J 3/50: Mechanisms producing characters by printing and also producing a record by other means {, e.g. printer combined with RFID writer}
- B41J 11/00214: {using UV radiation}
- B41J 13/12: specially adapted for {small} cards, envelopes, or the like {, e.g. credit cards, cut visiting cards}
- B41M 5/0047: {by ink-jet printing}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)

## Abstract

A card processing system includes a drop-on-demand card printing system that has at least one drop-on-demand print head with a nozzle plate. An automated cleaning mechanism is provided in the drop-on-demand card printing system that is configured to clean the nozzle plate without the cleaning mechanism physically contacting the nozzle plate. Since the nozzle plate is not physically contacted by the cleaning mechanism, damage to the nozzle plate during cleaning is avoided thereby avoiding degrading the resulting print quality of the print head.

## Claims

### Claim 1

A method, comprising:
in a card processing system, processing a plurality of cards, wherein the processing includes:
at least one of reading data from and/or writing data to a magnetic stripe on each card in a magnetic stripe reading/writing system and programming data on an integrated circuit chip on each card in an integrated circuit chip programming system;
printing on each card in a drop-on-demand card printing system using ultraviolet curable ink, the drop-on-demand card printing system includes at least one drop-on-demand print head having a nozzle plate; and
curing the ultraviolet curable ink applied to each card;
cleaning the nozzle plate of the at least one drop-on-demand print head using a cleaning mechanism in the drop-on-demand card printing system, wherein the cleaning mechanism is configured to clean the nozzle plate of the at least one drop-on-demand print head without the cleaning mechanism physically contacting the nozzle plate.

### Claim 2 (depends on 1)

The method of claim 1, wherein cleaning the nozzle plate includes:
applying a cleaning fluid to a surface of the nozzle plate using a cleaning block of the cleaning mechanism without the cleaning block physically contacting the nozzle plate;
using a vacuum orifice on the cleaning block to remove the cleaning fluid from the nozzle plate without the cleaning block physically contacting the nozzle plate.

### Claim 3 (depends on 1)

The method of claim 1, wherein cleaning the nozzle plate includes:
forcing ink through the nozzle plate;
using a vacuum orifice on a cleaning block of the cleaning mechanism to remove residual ink from the nozzle plate without the cleaning block physically contacting the nozzle plate.