Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
1997-11-21
2001-03-20
Le, N. (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S029000, C347S035000
Reexamination Certificate
active
06203138
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink jet recording apparatus incorporating a recording head which discharges ink from a discharge opening so as to record desired information. More particularly, the present invention relates to an ink jet recording apparatus having a waste ink collecting section for collecting waste ink cleared by a recovery means which maintains and recovers excess ink from the recording head.
2. Description of the Related Art
Ink jet recording apparatus having a discharge recovery function for maintaining and recovering excess ink cleared from a recording head are known. During the recovering operation, ink is cleared from the discharge opening in the recording head without being used for recording. In most of the known apparatuses of the type described, the waste ink cleared from the discharge opening is collected in a waste ink collecting section through tubing or the like and is then discarded.
Hitherto, various types of waste ink collecting systems have been proposed. For instance, a system has been proposed in which the waste ink is discharged into a disposable tray which can be removed from the apparatus and discarded. Another known system employs a waste ink reservoir which is replaceably mounted in the apparatus and which is provided with an ink absorber. In still another known system, the waste ink is returned to a waste ink reservoir integrated with the ink cartridge which stores the fresh ink that is supplied to the recording head.
In the system which employs the waste ink reservoir, it is necessary to change the reservoir as stated above, since the volume of the waste ink in the reservoir increases whenever the ink is cleared. In a system of the type in which the waste ink reservoir is integrated with the ink cartridge, the ink cartridge and, hence, the waste ink reservoir are changed each time the fresh ink supply for recording is exhausted, regardless of the amount of waste ink present in the waste ink reservoir.
Other proposals include a waste ink collecting system having a waste ink reservoir with a volume large enough to contain the total amount of waste ink which is expected to be generated during a possible period of operation of the recording apparatus, and a waste ink collecting system having means for sensing the amount of waste ink in an waste ink reservoir which signals the user that it is necessary to change the waste ink reservoir, thus enabling the reservoir to be changed at suitable intervals.
These known waste ink collection systems, however, suffer from the following disadvantages.
Namely, in the system of the type in which the waste ink reservoir is replaced together with the ink cartridge regardless of the amount of the waste ink collected in the reservoir, problems arise because reservoir may hold either very little or too much waste ink when the fresh ink in the reservoir has been consumed. In the former case, the waste ink reservoir is replaced unnecessarily, whereas, in the latter case, the recorded image and/or the operator's hand may become dirty should the waste ink reservoir overflow or leak waste ink. In the worst case, the operation of the recording apparatus itself may be impeded because of the waste ink leaking from the reservoir.
The collection system having a waste ink reservoir large enough to contain the total quantity of waste ink expected to be generated throughout the entire life of the recording apparatus is also impractical because the size and the cost of the apparatus are increased due to extremely large size of the waste ink reservoir needed. In addition, since the total amount of the waste ink which can be stored is still limited, flooding of the waste ink and the ensuing contamination of the apparatus may still take place when there is excessive usage, for example, when there is an increase in the volume of the wasted ink due to operator error.
The aforementioned system which is able to sense the amount of waste ink collected in the waste ink reservoir has been proposed to obviate these problems. In one version of this system, means is provided for preventing operation of the recording apparatus unless the waste ink reservoir is changed once the reservoir is filled up with the waste ink. This improved system is widely used because of its high reliability in regard to the handling of the waste ink.
Various other methods, such as methods for sensing the pressure or weight or optically sensing the level of collected waste ink have been proposed to enable sensing the volume of the waste ink stored in the waste ink reservoir. These methods, however, require complicated sensing devices which not only raise the cost of the recording apparatus but also reduce the volume of the waste ink that can actually be collected in the ink reservoir because they occupy a considerable volume of space, with the result that the frequency with which the waste ink reservoir must be changed is increased undesirably.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide an ink jet recording apparatus which can monitor the amount of waste ink collected in a waste ink reservoir to indicate the proper time to change the reservoir, thus eliminating any contamination of the recorded images and apparatus by waste ink, thereby overcoming the above-described problems of the prior art.
Another object of the present invention is to provide an ink jet recording apparatus which can efficiently dispose of waste ink by making efficient use of the limited space inside the apparatus.
To these ends, according to one aspect of the present invention, there is provided an ink jet recording apparatus of the type having a recording head provided with at least one discharge opening from which an ink is discharged, recovery execution means for clearing a predetermined amount of ink from the discharge opening to avoid any discharge failure of the recording head, and waste ink receiving means for receiving the waste ink cleared from the discharge opening, the apparatus comprising a recovery control section which includes: counting means for counting the cumulative number of times that an ink clearing operation has been performed by the recovery execution means; memory means for storing the cumulative number of times that the ink clearing operation has been counted by the counting means; comparing means for comparing, before beginning the ink clearing operation, the cumulative number of times stored in the memory means with a predetermined upper limit data indicating the maximum permissible number of times that the ink clearing operation can be performed, determined with respect to the capacity of the waste ink receiving means; and control means for producing, when the comparison shows that the cumulative number of ink cleaning operations performed exceeds the upper limit data, a changing signal for alerting a user that the waste ink receiving means has to be changed.
According to another aspect of the present invention, there is provided an ink jet recording apparatus of the type having a recording head provided with at least one discharge opening from which ink is discharged, recovery execution means for clearing a predetermined amount of ink from the discharge opening to avoid any discharge failure of the recording head, and waste ink receiving means for receiving the waste ink cleared from the discharge opening, the apparatus comprising an ink recovery control section which includes: counting means for counting the cumulative number of ink clearing operations performed by the recovery execution means; memory means for storing the cumulative number of times that the ink cleaning operation has been counted by the counting means; comparing means for comparing, before beginning the ink clearing operation, the cumulative number of times stored in the memory means with a predetermined upper limit data indicating the maximum permissible number of times that the ink clearing operation can be performed, determined with respect to the capacity of the waste ink receiv
Arai Atsushi
Hirabayashi Hiromitsu
Kanemitsu Shinji
Koitabashi Noribumi
Matsubara Miyuki
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Hsieh Shih-Wen
Le N.
LandOfFree
Method of exchanging waste ink pack of ink jet recording... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of exchanging waste ink pack of ink jet recording..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of exchanging waste ink pack of ink jet recording... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2506288