Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2000-12-20
2004-02-10
Meier, Stephen D. (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
Reexamination Certificate
active
06688722
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink jet recording apparatus to form a desired image by discharging ink and a mechanism for discharging maintenance and recovery employed to maintain and recover the discharging condition of recording means of discharging ink for the recording apparatus.
2. Related Background Art
In an ink jet recording apparatus, there is a phenomenon observed when the ink mist generated by recording performance adheres to the discharging port formation face of the recording head or that dirt and dust in the apparatus or foreign substances such as paper particles, etc. concomitantly produced when transporting a recording medium adhere to the discharging port formation face. Such adherence of foreign substances to the discharging port formation face results in shifting the emitting direction of ink in some cases or clogging the discharging ports in the worst case. This leads to the deterioration of the ink discharging condition such as clogging, etc. and lowers the quality of the recorded image. For the purpose of improving such condition causing the deterioration of image quality, there has been proposed an apparatus wherein a cleaning member is arranged at a position in the non-recording region of a recording area opposite to the discharging port formation face to remove the adherent ink and foreign substances by slidably rubbing the discharging port formation face with a blade made of silicone rubber, etc., for example. Also, there has been proposed an apparatus provided with means for recovery by suction to forcibly exhaust ink from the discharging ports by generating a given suction force on the discharging port formation face by use of a pump while forming a closed system in the ink discharging unit using a capping member as a method of recovering from the clogging condition caused by the increased viscosity of ink resulting from ink dehydration at the discharging ports, clogging brought about by ink sticking or bubbles and dust produced in the liquid path. Nevertheless, if this suction recovery is performed, there occurs a state where ink remains in the contacting portion between the discharging port formation face and the capping member. (Hereinafter ink thus remaining is referred to as “cap marking ink”). Therefore, the structure is so arranged that this cap marking ink can also be cleaned off together with the ink mist and foreign substances by rubbing the discharging port formation face with the aforesaid cleaning member.
For example, as shown in
FIG. 1
, there has been proposed an apparatus wherein a cleaning member comprising a plastic board is arranged at the side of a capping member between the home position of a recording head and the recording area to clean the discharging port formation face of the recording head. Also, as shown in
FIG. 2
, there has been proposed an apparatus wherein a cleaning member comprising two cleaning members mounted in parallel thereon is arranged, each member having a different cleaning characteristic such as different hardness or different amount of contacting depth, which generates different contact pressure against the discharging port formation face.
From the viewpoint of simpler manufacturing process and lower manufacturing cost, recording heads having a discharging port formation face which is not flat have been proposed in recent years.
However, the discharging port formation face which is not flat makes it impossible for the cleaning members constructed as shown in FIG.
1
and
FIG. 2
to clean the vicinity of the discharging ports sufficiently in some cases. For example, as shown in FIG.
3
and
FIG. 4
, while recording head
21
is structured in such a manner that a front plate is arranged in the circumference of discharging ports
21
a
to constitute the discharging port formation face, the portion of discharging ports
21
a
forms a concavity which is sunken from the plane of the cap contacting portion
21
b
. In the aforesaid portion of discharging ports
21
a
, ink droplets (including foreign substances) Y
2
remain, and on the aforesaid cap contacting portion
21
b
, cap marking ink Z
2
remain. In this condition, when recording head
21
is transported in the direction indicated by arrow A to be in contact with rubber blade
22
, the cleaning of the discharging port formation face is performed.
As shown in
FIG. 4
, however, whereas cap marking ink Z
2
is cleaned off by rubber blade
22
as recording head
21
is being transported in the direction indicated by arrow A in this example, ink droplets (including foreign substances) Y
2
in the portion of discharging ports
21
a
remain uncleaned because these are not in contact with rubber blade
22
due to the concavity formed in the portion of discharging ports
21
a.
As the above describes, in the case where the recording head is structured with a step presenting the different planes for the region in which the discharging ports are formed and the regions other than that region, it is difficult to perform a complete cleaning over the entire region of the discharging port formation face.
SUMMARY OF THE INVENTION
In consideration of a condition such as this, the present invention is designed and an object thereof is to provide a mechanism for discharging maintenance and recovery to maintain an excellent condition of ink discharging from an ink jet recording head, which performs an extremely effective cleaning with a one-time cleaning operation even if the discharging port formation face as the recording head is not formed on the same plane as the other portions thereof as well as an ink jet recording apparatus provided with the aforesaid mechanism.
Another object of the present invention is to provide an ink jet apparatus which comprises:
a carriage member for mounting recording means for discharging ink;
a cleaning member arranged to face regions other than the recording region of the recording means for cleaning a discharging port formation face of the recording means;
transporting means for transporting the cleaning member to the position to clean the recording means and to the position not to clean it;
driving means for relatively driving the carriage member and the transporting means for the cleaning member to clean the discharging port formation face; and
the cleaning member being provided with a first cleaning member mainly used for cleaning the discharge port formation portion of the recording means and a second cleaning member mainly used for cleaning the circumference of the aforesaid discharging port formation portion.
Still another object of the present invention is to provide an ink jet apparatus which comprises:
a carriage member for mounting the recording means which is structured to form a concave ink discharging port formation portion
a capping member used to cover the discharging port formation face of the recording means for the maintenance and recovery of the ink discharging condition;
a cleaning member arranged to face regions other than the recording region of the recording means for cleaning the discharging port formation face of the recording means;
a driving means for relatively driving the carriage member and the cleaning member to clean the discharging port formation face; and
the cleaning member being provided with a first cleaning member mainly used for cleaning the concavity of the recording means and a second cleaning member mainly used for cleaning circumferential regions around the concavity.
A further object of the present invention is to provide a mechanism for the discharging maintenance and recovery to maintain and recover the ink discharging condition by slidably rubbing the discharging port formation face of the recording, means which is provided with a first cleaning member mainly used for cleaning a concave portion of the recording means and a second cleaning member mainly used for cleaning circumferential regions around the concave portion.
The second cleaning member arranged independently of the first member also clean completely the portions to whic
Tajika Hiroshi
Uchida Haruo
Brooke Michael S.
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Meier Stephen D.
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