Multi-nozzle head for ink on-demand type ink jet printer

• US 4,559,544 A
• Filed: 04/12/1984
• Issued: 12/17/1985
• Est. Priority Date: 04/14/1983
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Katano, Yasuo, Yamazaki, Hiroshi, Matsumoto, Shuzo, Isayama, Takuro
• Primary Examiner(s): Hartary, Joseph W.
• Application Number:
  US06/599,418
• Time in Patent Office: 614 Days
• Field of Search: 346/140, 346/75
• US Class Current: 347/71
• CPC Class Codes: B41J 2/15 for serial printing

Abstract

A unique arrangement of a multi-nozzle head which is suitable for use with an ink on-demand type ink jet printer. A flat head base is formed with a plurality of nozzles and ink compressing chambers associated therewith by etching. The ink compressing chambers are divided into a plurality of groups which are positioned on imaginary lines, which are individually inclined a predetermined angle with respect to an intended direction of ink ejection.

Claims

1. In a multi-nozzle head for an ink jet printer having a signal supply section for generating a displacement which corresponds to an information signal to be printed out, and an ink ejecting section for ejecting ink drops from a predetermined number of nozzles in response to the displacement, said ink ejecting section comprising:

(a) a flat head base; and

(b) said predetermined number of ink compressing chambers formed in said head base to supply ink to the nozzles respectively, said ink compressing chambers being arranged such that the ink compressing chambers are divided into a plurality of groups and said groups are respectively positioned on a plurality of imaginary lines which are individually inclined at predetermined angle with respect to an intended direction of ejection of ink drops from the nozzles;

the ink ejecting section further comprising flat resilient vibration members each constituting part of a wall which closes any of the ink compressing chambers associated therewith, and vibrating in response to the displacement imparted from the signal supply section;

the signal supply section comprising (c) elongate flat vibration units in a number which is equal to the number of the ink compressing chambers, and (d) a support member for supporting said vibration units at one portion of the vibration units such that the other end of each of the vibration units coincides with a position of any of the ink compressing chambers associated with said vibration unit;

the support member supporting the vibration units such that the vibration units lie in a common plane and extend in two opposing directions;

each of the vibration units comprising an electrostrictive vibrator displacable in response to the information signal to be printed out, a vibration plate integral with said electrostrictive vibrator and vibrating in response to the displacement, said electrostrictive vibrator and vibration plate being spaced from and extending parallel to the support member, and a vibration transmitting rod for transmitting the vibration to any of the ink compressing chambers associated with the vibration unit.

2. A multi-nozzle head as claimed in claim 1, in which the ink compressing chambers are further arranged such that the ink compressing chambers are respectively located below the nozzles during operation.

3. A multi-nozzle head as claimed in claim 1, in which said predetermined angle lies in a range of 0-90 degrees.

4. A multi-nozzle head as claimed in claim 1, in which the head base in the ink ejecting section further comprises a plurality of ink supply passageways for supplying ink from a source of ink supply to the ink compressing chambers, and a plurality of ink delivery passageways for delivering compressed ink from the ink compressing chambers to the nozzles associated with the ink compressing chambers.

5. A multi-nozzle head as claimed in claim 1, in which the vibration transmitting rod is prism-shaped.

6. A multi-nozzle head as claimed in claim 1, in which the vibration transmitting rod is pyramid-shaped.

7. A multi-nozzle head as claimed in claim 1, in which the vibration transmitting rod is formed integrally with the other end of the vibration plate.

8. A multi-nozzle head as claimed in claim 7, in which the vibration transmitting rod is prism-shaped.

9. A multi-nozzle head as claimed in claim 7, in which the vibration transmitting rod is pyramid-shaped.

10. A multi-nozzle head as claimed in claim 1, in which the vibration plate of the vibration unit is formed at the other end with engaging means for engaging with the vibration transmitting rod.

11. A multi-nozzle head as claimed in claim 1, in which the ink jet printer is of an ink on-demand type.

12. A multi-nozzle head as claimed in claim 1, in which the vibration transmitting rod is provided integrally with the flat resilient vibration member of the ink ejecting section.

13. A multi-nozzle head as claimed in claim 12, in which the vibration transmitting rod is prism-shaped.

14. A multi-nozzle head as claimed in claim 12, in which the vibration transmitting rod is pyramid-shaped.

15. A multi-nozzle head as claimed in claim 12, in which the vibration plate of the vibration unit is formed at the other end with engaging means for engaging with the vibration transmitting rod.