# US 8,783,832 B2 · Ink jet printing apparatus and method for controlling ink jet printing apparatus

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- Number: US 8,783,832 B2
- Document ID: US8783832B2
- Status: Granted
- Kind: B2
- Application number: 13/647,639
- Filed: 2012-10-09
- Published: 2013-05-30
- Granted: 2014-07-22
- Earliest claimed: 2011-11-30
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Kenichi Oonuki; Kiichiro Takahashi; Toshiyuki Chikuma; Hirokazu Yoshikawa; Hiroshi Taira; Wakako Tanaka
- Web page: https://patentgrep.com/patent/US8783832B2

## CPC

- B41J 2/04563: {detecting head temperature; Ink temperature}
- B41J 2/04528: {aiming at warming up the head}
- B41J 2/04553: {detecting ambient temperature}
- B41J 2/0458: {controlling heads based on heating elements forming bubbles}
- B41J 2/04581: {controlling heads based on piezoelectric elements}
- B41J 2/16526: {by applying pressure only}
- B41J 2/1753: {Details of contacts on the cartridge, e.g. protection of contacts}
- B41J 2/17553: {Outer structure}
- B41J 3/543: {with multiple inkjet print heads (B41J2/17503, B41J2/2103 take precedence)}
- B41J 29/38: Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J 2002/14475: {characterised by nozzle shapes or number of orifices per chamber}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

In an ink jet printing apparatus including a plurality of print heads and a method for controlling the ink jet printing apparatus, ink ejection can be immediately started. If temperatures of both a first print head and a second print head have become equal to or higher than a reference temperature at least once, a printing operation or a preliminary ejection operation using the first print head and the second print head is started even when one of the temperature of the first print head and the temperature of the second print head is lower than the reference temperature.

## Claims

### Claim 1

An ink jet printing apparatus comprising:
a receiving unit configured to receive an instruction to start a printing operation or a preliminary ejection operation;
a first print head with a plurality of print elements configured to eject ink;
a first heating unit configured to heat the first print head;
a first temperature measuring unit configured to measure a temperature of the first print head;
a second print head with a plurality of print elements configured to eject ink;
a second heating unit configured to heat the second print head;
a second temperature measuring unit configured to measure a temperature of the second print head; and
a control unit configured to control the first heating unit and the second heating unit in such a manner that the first print head and the second print head reach a reference temperature,
wherein if both the first temperature measuring unit and the second temperature measuring unit at least once measure that temperatures of the respective print heads have become equal to or higher than the reference temperature after the receiving unit receives the instruction, the control unit controllably starts the printing operation or the preliminary ejection operation using the first print head and the second print head when one of a temperature measured by the first temperature measuring unit and a temperature measured by the second temperature measuring unit is lower than the reference temperature at the start of the printing operation or the preliminary ejection operation.

### Claim 2 (depends on 1)

The ink jet printing apparatus according to claim 1, wherein the first heating unit is a resistor provided so as to surround the plurality of print elements of the first print head, and
the second heating unit is a resistor provided so as to surround the plurality of print elements of the second print head.

### Claim 3 (depends on 1)

The ink jet printing apparatus according to claim 1, further comprising a scanning unit in which the first print head and the second print head are mounted and which reciprocates with respect to a print medium.

### Claim 4 (depends on 1)

The ink jet printing apparatus according to claim 1, wherein the first temperature measuring unit and the second temperature measuring unit are diode sensors.

### Claim 5 (depends on 1)

The ink jet printing apparatus according to claim 1, wherein each of the first temperature measuring unit and the second temperature measuring unit comprises a plurality of temperature sensors.

### Claim 6

An ink jet printing apparatus comprising:
a receiving unit configured to receive an instruction to start a printing operation or a preliminary ejection operation;
a first print head with a plurality of electrothermal conversion elements configured to eject ink;
a first temperature measuring unit configured to measure a temperature of the first print head;
a second print head with a plurality of electrothermal conversion elements configured to eject ink;
a second temperature measuring unit configured to measure a temperature of the second print head; and
a control unit configured to control the plurality of electrothermal conversion elements in the first print head and the plurality of electrothermal conversion elements in the second print head in such a manner that temperatures of the first print head and the second print head reach a reference temperature,
wherein if both the first temperature measuring unit and the second temperature measuring unit at least once measure that temperatures of the respective print heads have become equal to or higher than the reference temperature after the receiving unit receives the instruction, the control unit controllably starts the printing operation or the preliminary ejection operation using the first print head and the second print head when one of a temperature measured by the first temperature measuring unit and a temperature measured by the second temperature measuring unit is lower than the reference temperature at the start of the printing operation or the preliminary ejection operation.

### Claim 7

A method for controlling an ink jet printing apparatus comprising a first print head with a plurality of print elements configured to eject ink and a second print head with a plurality of print elements configured to eject ink, the method comprising steps of:
receiving an instruction to start a printing operation or a preliminary ejection operation;
measuring a temperature of the first print head and a temperature of the second print head;
heating the first print head and the second print head in such a manner that temperatures of the first print head and the second print head reach a reference temperature; and
starting the printing operation or the preliminary ejection operation using the first print head and the second print head if temperatures of both the first print head and the second print head have become equal to or higher than the reference temperature at least once after receiving the instruction, when one of the measured temperature of the first print head and the measured temperature of the second print head is lower than the reference temperature at the start of the printing operation or the preliminary ejection operation.