Ink jet printer with a fixed positional relationship between a capping mechanism and printhead

• US 6,000,775 A
• Filed: 10/16/1997
• Issued: 12/14/1999
• Est. Priority Date: 11/13/1996
• Status: Expired due to Term

• Current Assignee: Brother Kogyo Kabushiki Kaisha (Brother Industries Limited)
• Original Assignee: Brother Kogyo Kabushiki Kaisha (Brother Industries Limited)
• Inventors: Muraki, Motohito
• Primary Examiner(s): Burr, Edgar
• Assistant Examiner(s): COLILLA, DANIEL JAMES
• Application Number:
  US08/951,544
• Time in Patent Office: 789 Days
• Field of Search: 347/8, 347/22, 347/29, 347/30
• US Class Current: 347/8
• CPC Class Codes: B41J 2/16511 Constructions for cap positioning B41J2/16547 takes precedence
• CPC Class Codes: B41J 25/308 with print gap adjustment mechanisms

Abstract

The position of a guide rail is changed by eccentrically rotating the guide rail by turning a control lever, thereby adjusting an amount of a head gap. A supporting frame for supporting a capping mechanism is connected to the guide rail. When the position of the guide rail is changed for the head gap adjustment, the position of the capping mechanism is also changed. Consequently, even when the position of the guide rail is changed for the head gap adjustment, the positional relation between the capping mechanism and the print head can be almost fixedly maintained.

Claims

1. A printing apparatus, comprising:

a platen across which a recording medium is fed;

a print head for printing onto the recording medium by jetting ink;

a carriage on which the print head is mounted, the carriage being provided movably along a guide rail;

a capping mechanism having a cap for air-tightly covering a nozzle surface of the print head, the capping mechanism making the cap come into contact with the nozzle surface of the print head;

a gap adjusting mechanism for adjusting an amount of a head gap between the print head and the platen to accommodate at least two different thicknesses of recording medium; and

a capping mechanism moving mechanism for moving the capping mechanism in a fixed relationship with the carriage during head gap adjustment by the gap adjusting mechanism in accordance with the thickness of the recording medium being used.

2. The printing apparatus according to claim 1, the gap adjusting mechanism comprising an eccentric collar mounted to the guide rail, the eccentric collar rotatably supported in the printing apparatus, wherein the head gap adjustment by the gap adjusting mechanism and movement of the capping mechanism by the capping mechanism moving mechanism result from movement of the guide rail upon rotation of the eccentric collar.

3. The printing apparatus according to claim 2, further comprising a supporting frame supporting the capping mechanism and having a portion which is fit to the guide rail, wherein a portion of the carriage is mounted to the guide rail.

4. The printing apparatus according to claim 3, wherein the gap adjusting mechanism further comprises a control lever that is connected to the guide rail and eccentrically rotates the guide rail in accordance with the head gap adjustment.

5. The printing apparatus according to claim 4, wherein the guide rail can be moved either to a first position when a recording medium is thick or to a second position in a case where the recording medium is thin.

6. The printing apparatus according to claim 1, wherein the capping mechanism is connected to a purging mechanism for sucking ink in the print head in relation to the capping mechanism.

7. An adjustable cleaning mechanism for a printing apparatus, the printing apparatus having a platen and a defined print area within a length of the platen, a carriage mounting at least one print head slideably mounted to a guide rail for reciprocal movement opposite and parallel to the platen, the adjustable cleaning mechanism comprising:

a supporting frame attached at one end to the guide rail;

a purging mechanism having a suction cap for each print head extendibly mounted to the supporting frame;

an eccentric collar mounted to the guide rail, a center of the eccentric collar offset from a center axis of the guide rail; and

a control lever attached to the eccentric collar and movable over a continuum of intermediate positions from a first position to a second position, wherein the supporting frame is positioned to a side of the defined print area and movement of the control lever between the first position and the second position causes the guide rail to move toward and away from the platen.

8. The adjustable cleaning mechanism according to claim 7, further comprising a resilient member attached between the control lever and the printing apparatus for retaining the control member in one of the first position and the second position.

9. The adjustable cleaning mechanism according to claim 7, wherein movement of the control lever from the first position to the second position, and from the second position to the first position, thereby rotating the eccentric collar causes the guide rail to be displaced a predetermined distance.

10. The adjustable cleaning mechanism according to claim 9, wherein the carriage and the supporting frame are equally displaced the distance the guide rail is displaced.

11. The adjustable cleaning mechanism according to claim 7, wherein the supporting frame further comprises a slideable attachment mechanism for attaching an end of the supporting frame, opposite to the one end attached to the guide rail, to the printer.

12. The adjustable cleaning mechanism according to claim 7, wherein the supporting frame has an opening through which the guide rail passes.

13. The adjustable cleaning mechanism according to claim 7, further comprising a wiping member extendibly mounted to the supporting frame.

14. An ink jet printer having a carriage for mounting at least one print head/ink cartridge system for reciprocal movement along a guide rail and opposed to a platen, further comprising:

a print head cleaning apparatus mounted at one end to the guide rail; and

means for moving the guide rail toward and away from the platen, wherein a positional relationship of the carriage and the print head cleaning mechanism is unchanged by the movement of the guide rail.

15. The ink jet printer according to claim 14, wherein the guide rail has a round cross section and passes through a hole in each of the carriage and the print head cleaning apparatus.

16. The ink jet printer according to claim 15, wherein the print head cleaning apparatus comprises:

a supporting frame;

a wiping mechanism mounted to the supporting frame; and

a suction mechanism mounted to the supporting frame, wherein the guide rail passes through the supporting frame.

17. The ink jet printer according to claim 14, wherein the means for moving comprises:

an eccentric collar mounted to each end of the guide rail, the eccentric collar received at each end in a frame of the ink jet printer; and

a control lever attached to the eccentric collar at at least one end of the guide rail, wherein a center of each eccentric collar is offset from a center axis of the guide rail.

18. The ink jet printer according to claim 17, the means for moving further comprising a position setting device for holding the control lever at a first position or a second position.

19. A printing apparatus, comprising:

a platen across which a recording medium is fed;

a print head for printing onto the recording medium by jetting ink;

a capping mechanism having a cap for air-tightly covering a nozzle surface of the print head; and

a moving mechanism for moving the print head and adjusting an amount of a head gap between the print head and the platen to accommodate at least two different thicknesses of recording medium, the moving mechanism moving the capping mechanism in a fixed relationship with the print head during head gap adjustment in accordance with the thickness of the recording medium being used.

20. The printing apparatus according to claim 19, wherein the moving mechanism includes a guide rail and the print head and the capping mechanism are moved by moving the guide rail.

21. The printing apparatus according to claim 20, further comprising a supporting frame supporting the capping mechanism, wherein the supporting frame and the carriage are mounted to the guide rail.

22. The printing apparatus according to claim 21, wherein the moving mechanism includes an eccentric collar and a control lever, the eccentric collar being mounted to the guide rail and the control lever being connected to the eccentric collar, the moving mechanism eccentrically rotates the guide rail in accordance with the head gap adjustment.

23. The printing apparatus according to claim 22, wherein the carriage and the supporting frame are both moved the same distance the guide rail is moved.

24. The printing apparatus according to claim 21, wherein the carriage and the supporting frame each have an opening through which the guide rail passes.