# Patent

## Title
Ink cartridge

## Abstract

An ink cartridge for an inkjet type printing apparatus having a print head, the ink cartridge including: a container having an ink chamber for containing ink therein; an ink supply port for ejecting the ink from the ink chamber to the print head; a memory device for storing data related to the ink or the ink cartridge, the memory device has an area in which the data is stored in a rewritable manner; and a contact device enabling the transmission of data between the memory device and an external device. The memory device may include data indicative of when the ink cartridge was recycled.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a continuation of U.S. application Ser. No. 09/318,268 filed May 25, 1999, the entirety of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an inkjet type printing apparatus which is supplied with ink from a replaceable ink cartridge, and ejects ink droplets from nozzle openings onto a recording medium for achieving the printing. The present invention also relates to an ink cartridge and an ink refilling device suited for use with the printing apparatus.
2. Related Art
A conventional inkjet printing apparatus includes, for example, a print head, and an ink cartridge for supplying ink to the print head. In the print head, a drive signal is applied to a piezoelectric vibrator or heating device in accordance with print data, and the ink within a pressure-generating chamber is activated by the energy, generated by the piezoelectric vibrator or the heating device, thereby ejecting ink droplets from nozzle openings.
The print quality is determined by the resolution of the print head, and besides is much influenced by the viscosity of ink and the degree of spreading (running) of ink on the recording medium. Therefore, in order to improve the print quality, the characteristics of the ink, as well as the drive signal to be applied to the print head, have been improved, and besides in order to prevent the clogging of the nozzle openings, maintenance conditions, such as the period of blank ejection and the ejection in a capped condition, have been improved.
Thus, when the characteristics of the ink and the print head-driving method are both suitably determined, the quality of the printing by the printing apparatus is improved. Such technical developments may be achieved by designing new inkjet printing apparatus to be manufactured, but for applying such achievements to printing apparatus already off the manufacturer, the printing apparatus must be brought to the manufacturer, and then memory device, storing control data, must be improved also. This is hardly possible practically, however, in view of the cost and the intricate process during manufacturing required.
Therefore, it has been proposed a method as disclosed in Japanese Patent Unexamined Publication No. 5-193127, in which an ink cartridge is provided with memory device, and characteristics of ink, the amount of the ink, drive conditions and so on are stored in the memory device, whereas in a printing apparatus, the drive conditions are adjusted in accordance with this information.
Incidentally, in view of the preservation of the environment, the manufacturers have now been required to recover as much as possible ink cartridges and cartridges with a print head, which have heretofore been discarded as consumable goods, and therefore a study has been made of refilling the recycled ink cartridges so that they can be recycled.
However, the ink cartridges, brought into users' possession, are used in various manners, and therefore the recycled ink cartridges are varied greatly in quality, and the regenerating processing can not be effected uniformly for such recycled products in contrast with the case of producing virgin products.
SUMMARY OF THE INVENTION
The invention has been made in view of the problems and difficulties accompanying the conventional art, and an object of the invention is to provide an ink cartridge which, when recycled, can be reused while maintaining a high quality.
Another object of the invention is to provide a printing apparatus suitable for such ink cartridge.
A further object of the invention is to provide a cartridge reproducing device suited for the above ink cartridge.
The above and other objects can be achieved by a provision of an ink cartridge which, according to the present invention, includes a container having an ink chamber for containing ink, and an ink supply port for ejecting the ink from the ink chamber to a print head; memory device for storing data related to the ink; and contact device enabling the transmission of data between the memory device and an external device, wherein the memory device has an area in which data, related to a history of use of the ink cartridge, can be stored in a rewritable manner.
The conditions of use of the ink cartridge by the user are stored in the memory device, and therefore at the time of reproducing the ink cartridge, the reproduction processing, suited for the ink cartridge, can be effected in accordance with the data in the memory device.



BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1A and 1B are views showing preferred embodiments of ink cartridges of the present invention, respectively;
FIGS. 2A and 2B are views showing a front and rear sides of a circuit substrate mounted on the ink cartridge shown in FIGS. 1A and 1B;
FIG. 3 is a view showing a printing mechanism portion of a printing apparatus employing the ink cartridges;
FIG. 4 is a cross-sectional view showing a condition in which the ink cartridge is mounted onto a carriage;
FIG. 5 is a block diagram showing one example of a control device for controlling the operation of the above device;
FIG. 6 is a flow chart showing the operation of the above device;
FIG. 7 is a flowchart showing a main operation and a process of one ink cartridge in the cleaning process for the printing apparatus of the present invention;
FIG. 8 is a flowchart showing a process of the other ink cartridge in the cleaning process for the printing apparatus of the present invention;
FIG. 9 is a view showing one embodiment of an ink refilling device;
FIG. 10 is a flow chart showing the overall operation of the ink refilling device; and
FIG. 11 is a flow chart showing a charging process by the ink refilling device.



DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will now be described in detail with reference to the drawings.
FIG. 1 show preferred embodiments of ink cartridges 10 and 20 suited for an inkjet printing apparatus of the present invention. A container 11, 21 contains ink, and an upper side thereof is sealed by a lid 12, 22. A porous member is filled in the container 11, 21, and is impregnated with the ink.
An ink supply port 13, 23 is formed at the bottom surface of the container 11, 21, and when the container is mounted on a carriage 42, the ink supply port 13, 23 is hermetically engaged with ink supply needle (needles) 44, 45. A circuit board 30 is fixedly mounted on one side surface of the container 11, 21.
Contacts 31 for electrical contact with the printing apparatus are formed on that side of the circuit board 30, as shown in FIGS. 2(a) and 2(b), which serves as an outer surface when the circuit board 30 is mounted on the ink cartridge. Semiconductor memory device 32 is mounted in an accessible manner on that portion of the outer surface of the circuit board 30 which does not prevent the formation of the contacts 31.
Fixed data, such as the production date, the lifetime and the number of refilled times that can be made, are stored in the semiconductor memory device 32, and besides the following data and character series directly relating to those data can be stored in a rewritable manner in predetermined areas of this memory device 32:
(1) The number of refilled times of the ink cartridge.
(2) Maintenance conditions such as the condition of cleaning of the ink cartridge and the condition of exchange of parts at the time the ink cartridge is refilled.
(3) Conditions of use such as the time of final use of the ink cartridge, the time of the final ink end, and the environment of use of the ink cartridge.
In a case where the various kinds of data are stored by means of the character series data, the printing apparatus is designed to store data for interpreting the character series data. Accordingly, the memory capacity of the memory device 32 can be reduced remarkably.
FIG. 3 shows one example of a printing mechanism portion of the printing apparatus. The carriage 42 is connected to a drive motor 41 via a timing belt 40, and a holder 43 for holding the ink cartridge 10, containing black ink, and the ink cartridge 20, containing color inks, is formed at the upper side of the carriage 42, and a print head 46 for being supplied with the inks from the ink cartridges 10 and 20 through the ink needles 44 and 45 is provided at the lower surface of the carriage 42.
FIG. 4 shows the cross-sectional construction showing the condition of attachment of the ink cartridges to the carriage, using the black ink cartridge 10 as an example. When the ink cartridge 10 is properly connected to the ink supply needle 44, the contacts 31 of the circuit board 30 are connected to contacts 47 of the carriage 42, so that the ink cartridge 10 is connected to a control device 49 via a flexible cable 48, and the ink cartridge 10 is accessible from the control device 49.
FIG. 5 shows one example of a control device 49. Based on a signal from a host, head drive device 50 causes ink droplets to eject from the print head 46 in accordance with instruction signals from printing control device 51 and flushing control device 52 (for eliminating the clogging).
When the drive conditions and so on are stored in the memory device 32, the printing control device 51 reads the optimum drive conditions for the ink cartridge 10, 20 via access means 53, and effects the printing control. By doing so, even for a reproduced recycle product, the default drive conditions are determined such that the drive signal to be fed to the print head 46 can be adjusted so that the ink droplets can eject in the optimum amount, as described later.
Read-write control device 54 writes data, stored in data storage memory 55 onto the memory device 32 of the ink cartridges 10 and 20. The data storage memory 55 stores data related to the environment of use of the printing apparatus, detected by use environment detection means 56, the flushing operation by the flushing control device 52, and the cleaning operation by cleaning control device 57.
Next, the manner of use of the ink cartridges 10 and 20 of the above construction will be described with reference to a flow chart of FIG. 6.
When the ink cartridge 10, 20 is mounted onto the carriage 42, the printing control device 51 reads cartridge data stored in the semiconductor memory device 32 of the ink cartridge 10, 20 (Step B), and data indicative of the time of attachment is stored onto the semiconductor memory device 32 of the ink cartridge 10, 20 (Step C), and then it is judged from the number of reproducing time whether or not the cartridge is one to be reproduced (Step D). If the cartridge is one to be reproduced, the control data is adjusted (Step E).
If the cartridge is a fresh one, ink in the ink cartridge 10, 20 is supplied to the print head 46 under the default condition (Step F), and the printing processing is effected (Step G). On the other hand, if the cartridge to be reproduced, the data in the data storage memory 55 is adjusted and renewed in accordance with the cartridge data, and the ink charging is effected (Step F). By doing so, ink in the reproduced cartridge, which is somewhat lower in reliability than the virgin cartridge, is charged into the print head 46 in such a manner as not to degrade the printing quality, for example, by increasing the amount of drawing of the ink (Step F).
The ink in the ink cartridge 10, 20 is consumed as a result of the printing operation and the clogging prevention operation, and when the ink end is detected (Step H), data indicative of the time of the ink end is stored as cartridge data (Step I) in the semiconductor memory device 32 of the ink cartridge 10, 20 under the control of the printing control device 51. When attaching the ink cartridge, it is judged from the number of reproduction read (Step J) whether or not the next reproduction is possible (Step K), whether or not the cartridge container has reached the limit of the lifetime (Step L), whether or not a predetermined time period has elapsed after the ink end of the ink cartridge was detected (Step M), and whether or not the environment of use, monitored by the use environment detection means 56, has adversely affected the ink cartridge (Step N).
If all of these judgments are satisfied, it is indicated on the printing apparatus or on a display device of a host computer that the reproduction is possible (Step O), and the data in the data storage memory 55 is written onto the semiconductor memory device 32 of the ink cartridge 10, 20 (Step P). On the other hand, if any of these judgments is not satisfied, the refill of this cartridge is impossible, and therefore the printing apparatus or the display device of the host computer indicates that this cartridge is discarded (Step Q).
According to the embodiment described above, the semiconductor memory device 32 stores therein fixed data such as production date, lifetime, the possible number of reproduction, and the other data such as the actual number of reproduction applied to the subject ink cartridge, cleaning condition during the reproduction of the ink cartridge, maintenance condition such as exchange of parts, the latest usage time of the ink cartridge, the time of the ink end, the usage condition or environment of the ink cartridge. In addition, the memory device may also store therein a preset minimum ink amount to be held in the ink cartridge. That is, the minimum amount of ink is stored at the time when the ink cartridge is shipped from the factory, and the residual amount of ink when the ink cartridge is mounted on the printing device is recorded. Those data are read out to prevent the print head from being damaged.
FIGS. 7 and 8 are flowcharts showing the operation applied to the ink cartridge described above with reference to a printing apparatus mounting thereon two different ink cartridges, i.e., one is for black and the other is for color printing.
When two ink cartridges 10, 20 are mounted on a carriage 42 (STEP A), a read-write control device 54 reads out data of a current residual ink and a preset minimum amount of ink from a semiconductor memory device 32 of each of the ink cartridges 10, 20 (STEP B), and then the control device 54 compares the data with each other (STEP C).
As a result of the comparison, when the residual ink is smaller than the preset minimum amount of ink, an ink end indication is displayed on the printing apparatus or a display device of the host computer without processing the following operations (STEP D).
On the other hand, when the residual ink amount is greater than the preset minimum amount of ink, a print control device 51 executes the print operation at the time when a print instruction signal is inputted (STEP E). The number of ink droplets ejecting in accordance with the print instruction signal from the print head 46 are counted to calculate the ink amount which is consumed by the printing operation. A flushing control device 52 executes a so called flushing operation for preventing the nozzle openings from being clogged. During the flushing operation ink droplets are ejected every time when a predetermined quantity of printing has been performed or predetermined time expires. The ink ejection by the flushing operation does not contributes to the printing. However, the ink droplets ejecting during the flushing operation are also counted and the consumed amount of ink in the ink cartridges 10, 20 are calculated (STEP F). Subsequently, every time when the printing operation is temporally suspended, for example, a printing of one page is finished, the residual amount of ink is calculated and the data is stored in the semiconductor memory device 32 of each of the cartridges 10, 20 (STEP G).
When the printing operation continues for a long time and a print failure is occurred, an operator may instruct a cleaning operation or the control device automatically generates a cleaning instruction signal (STEP H). If the cleaning operation is instructed, a residual ink amount stored in the semiconductor memory device 32 of one of the ink cartridge, for example, a first ink cartridge 10, is read out (STEP I). Subsequently, the read-out residual amount of ink is compared with a sum of the preset minimum amount of ink stored in the semiconductor memory device 32 of the first ink cartridge and an ink amount to be consumed by the cleaning operation (STEP J).
When the residual ink in the first ink cartridge is sufficient, subsequently, data of a residual amount of ink stored in the semiconductor memory device 32 of the second ink cartridge 20 is read out (STEP K). Then the read-out residual amount of ink is compared with a sum of the preset minimum amount of ink stored in the semiconductor memory device 32 of the second ink cartridge and an ink amount to be consumed by the cleaning operation (STEP L).
Under the operation as described above, when both the ink cartridges contain therein sufficient amount of ink, the cleaning control device 57 executes a normal cleaning operation which requires relatively large quantity of ink (STEP M). After the normal cleaning operation is finished (STEP N), the process goes back to STEP A.
On the other hand, when the residual amount of ink in any one of the ink cartridges is smaller than the sum of the preset minimum ink amount stored in the semiconductor memory device 32 of the respective ink cartridge 10, 20 and the ink amount to be consumed by the normal cleaning operation, the cleaning control device 57 executes a brief cleaning operation which requires less ink than that by the normal cleaning operation (STEPS O, R). In this operation, an ink end condition is displayed with respect to the ink cartridge which suffers the shortage of ink, so that the apparatus offers a user to replace the ink cartridge with a new one (STEPs S, P). When the ink cartridge is replaced with a new cartridge full of ink following the display indicative of the shortage of ink (STEPs Q, T), the process goes back to STEP I where the cleaning operation is resumed.
Further, in STEP T, when a new ink cartridge is mounted on the print head, new ink is supplied to the print head from the new ink cartridge. Because the brief cleaning operation has been performed before replacing the old ink cartridge, the clogging problem at the nozzle openings might have been fixed to some extent. Accordingly, the ink supply to the print head from a new ink cartridge can be achieved assuredly and smoothly compared with a case in which the old ink cartridge is replaced without performing a brief cleaning operation.
In this case, because a part of the cleaning has been carried out before replacing the ink cartridge, it is preferable that the resumed normal cleaning operation should be performed at the reduced amount of ink which has been consumed in the previous cleaning operation performed with the old ink cartridge.
According to the above embodiment, the possibility of the cleaning operation is determined in accordance with the preset minimum ink amount stored in the semiconductor memory device 32 of the ink cartridges 10, 20 at the time when the ink cartridge is shipped from the factory. Accordingly, the optimum minimum ink amount can be preset corresponding to the drying speed of ink and variation of the volatile speed of the ink solvent or the like. As a result, the apparatus can be prevented from the problems that the print head is damaged by the white dot, i.e., ejection of no-ink, and an erroneous ink end indication is displayed while a large amount of ink is still remained in the ink cartridge.
In addition, in the embodiment described above, if the residual amount of ink is small, the brief cleaning operation is performed so that the ink is effectively consumed. However, it may be applicable that the brief cleaning operation is not carried out, i.e., the STEPs O and R are omitted, and the following process is stopped while displaying the ink end indication and waiting for the replacement of the ink cartridge.
FIG. 9 shows one preferred embodiment of a cartridge reproducing device. Reproduction control device 60 reads data from the semiconductor memory device 32 of the recycled ink cartridge 10′, 20′ through access means 61, and controls ink discharge means 63, parts exchange means 64, cleaning means 65 and ink charge means 66 in accordance with evaluation data stored in data storage means 62, and in accordance with this evaluation data, the refill control device 60 causes the operating conditions in the printing apparatus to be stored in the semiconductor memory device 32.
The operation of the reproducing device of this construction will now be described with reference to a flow chart shown in FIG. 10.
When the ink cartridge 10′ is set on a working pallet 67 (Step A), the reproducing control device 60 reads the data from the semiconductor memory device 32 through the access means 61 (Step B), and it is judged whether or not the number of reproductions of this ink cartridge is less than a predetermined number (for example, 10) (Step C), whether or not the time period after the manufacture is less than a predetermined period (for example, 10 years) (Step D), whether or not the time period after the latest ink end is less than a predetermined period (for example, 200 days) (Step E), and whether or not the ink cartridge has been used in a predetermined environment (Step F). If all of these judgments are satisfied, it is indicated that the re-use of the cartridge is possible (Step G), and the reproduction processing is effected (Step H). On the other hand, if any of these requirements is not satisfied, it is indicated that the re-use of the cartridge is impossible, and there is given an instruction to discard this ink cartridge.
The cartridge, which satisfies the reproduction requirements, is transferred to the ink discharge means 63 by the pallet 67, and the ink, remaining in the cartridge, is discharged therefrom by suction or the like (Step A in FIG. 11). The reproducing control device 60 judges from the data, read from the ink cartridge whether or not the part (for example, a packing fitted in the ink supply port) reaches the limit of the lifetime (Step B in FIG. 11), and the necessary part is exchanged by the parts exchange means 64 (Step C in FIG. 11).
Then, in view of the lapse of time after the latest ink end, it is judged whether or not the cleaning is necessary (Step D in FIG. 11), and in accordance with this time period, the time of cleaning by the cleaning means 65, that is, the degree of cleaning, is determined (Steps E to G in FIG. 11).
When the pretreatments necessary for the reproduction are finished, the reproducing control device 60 judges whether or not the ink cartridge should be washed with ink to be charged (This is necessary because a change in the composition of the ink for the color ink cartridge subtly influences the printing quality) (Step H in FIG. 11), and if this is necessary, a large amount of ink is supplied to the ink charge means 66, and a predetermined amount of the ink is discharged from the ink cartridge, thereby washing the ink cartridge with the ink to be refilled, and a predetermined amount of the ink is charged into the ink cartridge (Step I in FIG. 11). If the washing with the ink is not necessary, a predetermined amount of the ink is supplied and charged into the ink cartridge (Step J in FIG. 11).
After the ink filling is finished, the cartridge data, such as the necessary information ((1) the date of reproduction, (2) the number of the reproduction, (3) the exchange of the part and its name, and optionally (4) a method of charging the ink into the print head, depending on the number of reproduction, and the amount of drawing of ink)), are stored in the semiconductor memory device 32 of the refilled ink cartridge under the control of the reproduction control device 60 (Step I in FIG. 10).
Thus, the history of the reproduced cartridge, refilled with the ink, is clear, and the operation of the printing apparatus is ensured by the data related to the operating method required because of its difference from the virgin ink cartridge.
As described above, according to the present invention, there is provided the memory device having the areas in which the data, related to the history of use of the ink cartridge, can be stored in a rewritable manner, and therefore the refill processing can be effected at the refill process in view of the conditions of use of the ink cartridge by the user, and the recycle can be effected in a highly-reliable manner.

## Claims

1. A recycled ink cartridge manufactured by recycling a used ink cartridge, the recycled ink cartridge comprising:
a container having an ink chamber for containing ink therein;
an ink supply port in fluid communication with the ink chamber;
a memory device storing therein data indicative of when the used ink cartridge was recycled,
wherein:
the memory device further stores therein data related to an exchange, by a recycling operation, of a part of the used ink cartridge, and
the part does not include ink.

2. The recycled ink cartridge according to claim 1, wherein the data indicative of when the used ink cartridge was recycled includes data indicative of a date when the used ink cartridge was recycled.

3. The recycled ink cartridge according to claim 1 wherein the data indicative of when the used ink cartridge was recycled includes data indicative of a date when the used ink cartridge was refilled with ink.

4. The recycled ink cartridge according to claim 1, wherein the memory device further stores therein data related to the ordinal number of a recycling operation carried out on the used ink cartridge.

5. The recycled ink cartridge according to claim 1, wherein the memory device further stores therein data related to a method of charging ink into a print head from the recycled ink cartridge.

6. The recycled ink cartridge according to claim 1, wherein the memory device further stores therein data related to an amount of ink drawn via a print head from the recycled ink cartridge.

7. The recycled ink cartridge according to claim 1, wherein the memory device is provided on a circuit board containing electrical contacts, said memory device provided on a surface of said circuit board that is opposite to a surface containing said electrical contacts.

8. The recycled ink cartridge according to claim 1, wherein the memory device further stores therein data indicative of a minimal amount of ink to be held in the recycled ink cartridge.