Insertable baffle for an ink supply reservoir

• US 5,975,687 A
• Filed: 11/06/1995
• Issued: 11/02/1999
• Est. Priority Date: 11/06/1995
• Status: Expired due to Term

• Current Assignee: Funai Electric Co., Ltd. (Funai Electric Holdings Company Limited)
• Original Assignee: Lexmark International Incorporated (Ninestar Corporation)
• Inventors: Powers, James Harold
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): TOATLEY, GREGORY J
• Application Number:
  US08/554,426
• Time in Patent Office: 1,457 Days
• Field of Search: 347/87, 347/86, 347/85, 347/84, 220/563, 220/564
• US Class Current: 347/86
• CPC Class Codes: B41J 2/17513 Inner structure

Abstract

A baffle assembly for insertion into an ink supply reservoir includes a first baffle plate having a first end and a second end, wherein a first end plate is coupled to the first end of the first baffle plate and a second end plate is coupled to the second end of the first baffle plate. The first baffle plate, the first end plate, and the second end plate form an integral structure. When the baffle assembly is inserted into the ink supply reservoir, a distance, "b", between the first baffle plate and an adjacent side-wall of the ink supply reservoir satisfies the inequality relationship b<(g/a)Dm/2k, wherein "g" is the local acceleration of gravity; "a" is the acceleration experienced by the ink supply reservoir during a change in a travel direction, "Dm" is the change in an ejected ink drop mass due to a change in an ink reservoir pressure in the ink supply reservoir, and "k" is a slope of the ink drop mass versus the ink reservoir pressure. The baffle assembly loosely divides a volume of the ink supply reservoir into a plurality of smaller compartments. An ink flow between the plurality of compartments may be provided by a gap between the baffle plates and the floor of the ink supply reservoir.

Claims

1. A baffle assembly for insertion into an ink supply reservoir having a pair of opposing sidewalls, comprising:

a first baffle plate having a first end and a second end;

a first end plate coupled to and extending in a transverse direction relative to the first end of said first baffle plate, said first end plate being configured for extending from and between the pair of sidewalls in the transverse direction; and

a second end plate coupled to and extending in a transverse direction relative to the second end of said first baffle plate, said second end plate being configured for extending from and between the pair of sidewalls in the transverse direction.

2. The baffle assembly of claim 1, wherein said first baffle plate, said first end plate, and said second end plate form an integral structure.

3. The baffle assembly of claim 1, wherein said baffle plate loosely divides a volume of said ink supply reservoir into a plurality of smaller compartments, and wherein an ink flow between said plurality of compartments is provided by a gap between said first baffle plate and a floor wall of said ink supply reservoir.

4. The baffle assembly of claim 1, wherein said baffle plate is formed from a material different from a material from which said ink supply reservoir is formed.

5. The baffle assembly of claim 1, wherein said first baffle plate is formed from a compliant material.

6. The baffle assembly of claim 5, wherein said compliant material is selected from a group consisting of plastic, rubber and metal.

7. The baffle assembly of claim 1, wherein said baffle assembly is formed from a compliant material.

8. The baffle assembly of claim 1, wherein said baffle assembly is sized to allow said baffle assembly to move in said ink supply reservoir in a direction parallel to a direction of motion of said printer cartridge.

9. The baffle assembly of claim 1, further comprising a second baffle plate arranged substantially parallel to said first baffle plate, said second baffle plate having a first end and a second end, wherein said first end plate is coupled to the first end of said second baffle plate and said second end plate is coupled to the second end of said second baffle plate.

10. The baffle assembly of claim 9, wherein said first baffle plate, said second baffle plate, said first end plate, and said second end plate form an integral structure.

11. The baffle assembly of claim 9, wherein said first and second baffle plates loosely divide a volume of said ink supply reservoir into a plurality of smaller compartments, and wherein an ink flow between said plurality of compartments is provided by a gap between said first and second baffle plates and a floor of said ink supply reservoir.

12. The baffle assembly of claim 9, wherein said first and second baffle plates are formed from a material different from a material from which said ink supply reservoir is formed.

13. The baffle assembly of claim 9, wherein said first and second baffle plates are formed from a compliant material.

14. The baffle assembly of claim 13, wherein said compliant material is selected from a group consisting plastic, rubber and metal.

15. The baffle assembly of claim 9, wherein said baffle assembly is sized to allow said assembly to move in said ink supply reservoir in a direction parallel to a direction of motion of said printer cartridge.

16. The baffle assembly of claim 1, wherein said ink supply reservoir includes a floor wall interconnecting said pair of opposing sidewalls, said first baffle plate being disposed substantially perpendicular to said floor wall.

17. The baffle assembly of claim 1, wherein said baffle assembly is constructed from a substantially non-porous material.

18. A baffle assembly for insertion into an ink supply reservoir, comprising:

a first baffle-plate having a first end and a second end;

a first end plate coupled to the first end of said first baffle plate; and

a second end plate coupled to the second end of said first baffle plate;

wherein when said baffle assembly is inserted into said ink supply reservoir, a distance, b, between said first baffle plate and an adjacent sidewall of said ink supply reservoir satisfies the inequality relationship b<

(g/a)Dm/2k, wherein;

g is the local acceleration of gravity,

a is the acceleration experienced by said ink supply reservoir during a change in a travel direction,

Dm is the change in an ejected ink drop mass due to a change in an ink reservoir pressure in said ink supply reservoir, and

k is a slope of a graph of said ink drop mass versus said ink reservoir pressure.

19. A baffle assembly for insertion into an ink supply reservoir, comprising:

a first baffle plate having a first end and a second end;

a first end plate coupled to the first end of said first baffle plate; and

a second end plate coupled to the second end of said first baffle plate;

wherein when said baffle assembly is inserted into said ink supply reservoir, a distance, b, between said first baffle plate and an adjacent sidewall of said ink supply reservoir satisfies the inequality relationship b<

(g/a)Dh, wherein;

g is the local acceleration of gravity (approximately 980 cm/sec

     2);

a is the acceleration experienced by the baffle assembled during a change in travel direction; and

Dh is the hydrostatic pressure equivalent to the maximum acceptable pressure impulse amplitude.

20. A baffle assembly for insertion into an ink supply reservoir, comprising:

a first baffle plate having a first end and a second end;

a second baffle plate arranged substantially parallel to said first baffle plate, said second baffle plate having a first end and a second end;

a first end plate coupled to the first end of each of said first baffle plate and said second baffle plate; and

a second end plate coupled to the second end of each of said first baffle plate and said second baffle plate;

wherein a distance, b, between said first baffle plate and said second baffle plate satisfies the inequality relationship b<

(g/a)Dm/2k, wherein;

g is the local acceleration of gravity,

a is the acceleration experienced by said ink supply reservoir during a change in a travel direction,

Dm is the change in an ejected ink drop mass due to a change in an ink reservoir pressure in said ink supply reservoir, and

K is a slope of said ink drop mass versus said ink reservoir pressure.

21. A baffle assembly for insertion into an ink supply reservoir, comprising:

a first baffle plate having a first end and a second end;

a second baffle plate arranged substantially parallel to said first baffle plate, said second baffle plate having a first end and a second end;

a first end plate coupled to the first end of each of said first baffle plate and said second baffle plate; and

a second end plate coupled to the second end of each of said first baffle plate and said second baffle plate;

wherein a distance, b, between said first baffle plate and said second baffle plate is given by the relationship b<

(g/a)Dh, wherein;

g is the local acceleration of gravity (approximately 980 cm/sec

     2);

a is the acceleration experienced by the printer cartridge during a change in travel direction; and

Dh is the hydrostatic pressure equivalent to the maximum acceptable pressure impulse amplitude.

22. A printer cartridge, comprising:

a reservoir body forming a container for storing a supply of ink and having a pair of opposing sidewalls; and

a baffle assembly positioned in said reservoir body, said baffle assembly including;

a first baffle plate having a first end and a second end;

a first end plate coupled to and extending in a transverse direction relative to the first end of said first baffle plate, said first end plate extending from and between the pair of sidewalls in the transverse direction; and

a second end plate coupled to and extending in a transverse direction relative to the second end of said first baffle plate, said second end plate extending from and between the pair of sidewalls in the transverse direction.

23. The baffle assembly of claim 22, wherein said first baffle plate, said first end plate, and said second end plate form an integral structure.

24. The baffle assembly of claim 22, wherein said first baffle plate loosely divides a volume of said reservoir body into a plurality of smaller compartments, and wherein an ink flow between said plurality of compartments is provided by a gap between said first baffle plate and a floor wall of said reservoir body.

25. The baffle assembly of claim 22, wherein said first baffle plate is formed from a material different from a material from which said reservoir body is formed.

26. The baffle assembly of claim 22, wherein said assembly is sized to allow said assembly to move in said reservoir body a direction parallel to a direction of motion of a printer carriage.

27. The baffle assembly of claim 22, further comprising a second baffle plate arranged substantially parallel to said first baffle plate, said second baffle plate having a first end and a second end, wherein said first end plate is coupled to the first end of said second baffle plate and said second end plate is coupled to the second end of said second baffle plate.

28. A printer cartridge, comprising:

an ink supply reservoir; and

a baffle assembly for insertion into said ink supply reservoir, said baffle assembly including a baffle plate which divides said ink supply reservoir into a plurality of compartments,

wherein a distance, b, between said baffle plate and an adjacent sidewall of said ink supply reservoir satisfies the inequality relationship b<

(g/a)Dm/2k, wherein;

g is the local acceleration of gravity,

a is the acceleration experienced by said ink supply reservoir during a change in a travel direction,

Dm is the change in an ejected ink drop mass due to a change in an ink reservoir pressure in said ink supply reservoir, and

k is the slope of the graph of said ink drop mass versus said ink reservoir pressure.

29. A printer cartridge, comprising:

an ink supply reservoir; and

a baffle assembly for insertion into said ink supply reservoir, said baffle assembly including a baffle plate which divides said ink supply reservoir into a plurality of compartments,

wherein a distance, b, between said baffle plate and an adjacent sidewall of said ink supply reservoir satisfies the inequality relationship b<

(g/a)Dh, wherein;

g is the local acceleration of gravity,

a is the acceleration experienced by said ink supply reservoir during a change in a travel direction,

Dh is the hydrostatic pressure equivalent to the maximum acceptable pressure impulse amplitude.

30. A printer cartridge, comprising:

an ink supply reservoir; and

a baffle assembly positioned in said ink supply reservoir, said baffle assembly including a first baffle plate and a second baffle plate, wherein a distance, b, between said first baffle plate and said second baffle plate satisfies the inequality relationship b<

(g/a)Dm/2k, wherein;

g is the local acceleration of gravity,

a is the acceleration experienced by said ink supply reservoir during a change in a travel direction,

Dm is the change in an ejected ink drop mass due to a change in an ink reservoir pressure in said ink supply reservoir, and

k is the slope of the graph of said ink drop mass versus said ink reservoir pressure.

31. A printer cartridge, comprising:

a reservoir body forming a container for storing a supply of ink; and

a baffle assembly positioned in said reservoir body, wherein a distance, b, between said first baffle plate and said second baffle plate satisfies the inequality relationship b<

(g/a)Dh, wherein;

g is the local acceleration of gravity (approximately 980 cm/sec

     2);

a is the acceleration experienced by said reservoir body during a change in a travel direction; and

Dh is the hydrostatic pressure equivalent to the maximum acceptable pressure impulse amplitude.