# US 7,607,749 B2 · Printer

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- Number: US 7,607,749 B2
- Document ID: US7607749B2
- Status: Granted
- Kind: B2
- Application number: 12/053,146
- Filed: 2008-03-21
- Published: 2008-09-25
- Granted: 2009-10-27
- Earliest claimed: 2007-03-23
- Assignees: Seiko Epson Corporation
- Inventors: Kunio Tabata; Toshiyuki Suzuki; Atsushi Oshima
- Web page: https://patentgrep.com/patent/US7607749B2

## CPC

- B41J 11/007: {Conveyor belts or like feeding devices}
- B41J 11/008: {Controlling printhead for accurately positioning print image on printing material, e.g. with the intention to control the width of margins}
- B41J 29/38: Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A printer includes a first transporting belt that transports a print medium and a second transporting belt that receives the print medium from the first transporting belt and further transports the print medium. A liquid ejection head ejects liquid according to a liquid-ejection timing signal to the print medium transported by the first transporting belt and the second transporting belt. A signal generator outputs the liquid-ejection timing signal according to a first signal and a second signal that correspond to the travel of the first and second transporting belts, respectively. When the phase difference between the first and second signals has a predetermined threshold value or less, the signal generator switches from outputting the liquid-ejection timing signal according to the first signal to outputting the liquid-ejection timing signal according to the second signal.

## Claims

### Claim 1

A printer comprising:
a first transporting belt that transports a print medium;
a second transporting belt that receives the print medium from the first transporting belt and further transports the print medium;
a first linear encoder that outputs a first signal corresponding to the travel of the first transporting belt;
a second linear encoder that outputs a second signal corresponding to the travel of the second transporting belt;
a liquid ejection head that ejects liquid according to a liquid-ejection timing signal to the print medium transported by the first transporting belt and the second transporting belt; and
a signal generator that outputs the liquid-ejection timing signal according to one of the first signal and the second signal, wherein
when the phase difference between the first signal and the second signal is a predetermined threshold value or less in transferring the print medium from the first transporting belt to the second transporting belt, the signal generator switches from outputting the liquid-ejection timing signal according to the first signal to outputting the liquid-ejection timing signal according to the second signal.

### Claim 2 (depends on 1)

The printer according to claim 1, wherein
when the phase difference between the first signal and the second signal is larger than the predetermined threshold value after a predetermined period of time has elapsed from the time where the print medium is transported to a designated position of the second transporting belt, the signal generator increases the predetermined threshold value.