JP4765276B2 - Inkjet device - Google Patents

Description

  The present invention relates to an ink jet apparatus having an ink supply / recovery mechanism.

Ink with poor dispersibility containing fine metal particles as a pigment quickly aggregates and settles, so when such ink is used in an inkjet device, the nozzles of the inkjet head and the filter located upstream of the inkjet head are aggregated. Will quickly cause clogging. Therefore, conventionally, a circulation mechanism that circulates ink in the ink supply path (see, for example, Patent Document 1) and an agitation device in the ink supply path (see, for example, Patent Document 2) provide agglomeration of ink. And methods for preventing sedimentation have been proposed.
Japanese Patent Application Laid-Open No. 2004-9985 JP 2002-273867 A

  However, it is impossible to completely prevent the ink from aggregating and settling even if the circulation mechanism and the stirring device described above are used, and clogging of the filter or the like occurs. The filter once clogged had to be replaced. In order to replace the filter, it is necessary to remove the ink in the ink supply path, which is troublesome and wastes ink. In addition, if the filter is frequently replaced, the cost increases. Further, when the filter is replaced, bubbles enter the ink supply path, and it is necessary to perform an operation for removing the bubbles, for example, purging. In particular, when the number of inkjet heads is large, it is not easy to completely remove such bubbles even by purging.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an ink jet apparatus capable of preventing the filter from being clogged with ink aggregates and dust, and extending the life of the filter.

In order to achieve the above object, the invention according to claim 1 is configured to maintain a negative pressure in order to supply ink to the inkjet head for ejecting ink, an ink tank for holding the ink, and the inkjet head. An ink supply means, an ink path connecting the ink jet head, the ink supply means and the ink tank, a filter provided on the ink path and between the ink jet head and the ink supply means, A waste ink tank connected to the ink path between the ink supply means and the filter, and connected to the ink path between the inkjet head and the filter to remove foreign matter. further a temporary storage ink tank for holding ink to be discharged to the waste ink tank during operation The temporary storage ink tank is connected to the ink path via a first valve, the waste ink tank is connected to the ink path via a second valve, and the inkjet head and the filter are It is characterized by being connected through three valves .

According to a second aspect of the invention, an ink jet apparatus of claim 1 Symbol placement, a plurality of respectively corresponding a plurality of ink jet heads, a plurality of filters respectively corresponding to the plurality of ink jet head, the ink jet head of the plurality of The ink-jet head is connected to the waste ink tank through a corresponding filter.

According to a third aspect of the invention, an inkjet apparatus according to claim 1 Symbol mounting, comprising a plurality of ink jet heads, a plurality of the temporary storage ink tank corresponding to the ink jet head of said plurality of said filter plurality of The inkjet heads are provided in common to all the inkjet heads, and each inkjet head is connected to the waste ink tank through the common filter.

Invention of claim 4, an ink jet apparatus of claim 1 Symbol mounting, comprising a plurality of ink jet heads, the filter and the temporary storage ink tank provided commonly to all of the plurality of inkjet heads, each The inkjet head is connected to the waste ink tank through the common filter.

The invention according to claim 5 is the ink jet apparatus according to any one of claims 1 to 4 , wherein at least a part of the ink path is evacuated to remove the ink in the temporary storage ink tank . Further, negative pressure means for discharging to the waste ink tank through the filter is further provided.

The invention of claim 6 wherein is an ink jet apparatus according to any one of claims 1 to 4, wherein the pressurizing temporary storage ink tank, the ink of the temporary storage ink tank, through the filter And pressurizing means for discharging to the waste ink tank.

According to a seventh aspect of the present invention, there is provided an inkjet head that performs recording by discharging ink, an ink tank that holds ink, an ink supply unit that supplies ink to the inkjet head, the inkjet head, the ink supply unit, and an ink An ink jet apparatus comprising: an ink path for connecting a tank; a filter provided on the ink path between the ink jet head and the ink supply means; and a purge cap for sucking and purging the ink jet head. And a temporary storage for holding the ink discharged to the waste ink tank during the foreign substance removal operation, connected to the purge cap, and connected to the ink path between the ink supply means and the ink jet head. further comprising an ink tank, the temporary storage ink tank A first valve is connected to the ink path between the purge cap and the waste ink tank, and the waste ink tank is connected to the ink path via a second valve, and the purge cap and the waste ink tank are connected. The ink tank is connected via a third valve .

Invention of claim 8, wherein an ink-jet apparatus according to claim 7 Symbol mounting a plurality of respectively corresponding a plurality of ink jet heads, a plurality of filters respectively corresponding to the plurality of ink jet head, the ink jet head of the plurality of The ink-jet head is connected to the waste ink tank through a corresponding filter.

Invention of claim 9, an inkjet apparatus of placing serial to claim 7 or 8, by subtracting at least a part of the ink path in a vacuum, the ink of the temporary storage ink tank, wherein the purge cap And a negative pressure means for discharging the ink to the waste ink tank through the inkjet head and the filter.

Invention of claim 10, wherein an ink jet apparatus mounting serial to claim 7 or 8, wherein the pressurized temporary storage ink tank, the ink of the temporary storage ink tank, and the purge cap, the inkjet It is further characterized by further comprising a pressurizing means for discharging to the waste ink tank through the head and the filter.

An eleventh aspect of the invention is the ink jet apparatus according to any one of the first to tenth aspects, further comprising ultrasonic vibration means for applying ultrasonic vibration to the temporary storage ink tank.

A twelfth aspect of the present invention is the ink jet apparatus according to any one of the first to eleventh aspects, wherein the temporary storage ink tank has flexibility.

  As described above, according to the present invention, the ink in the temporary storage ink tank is caused to flow in the direction opposite to that during ink discharge and is discharged to the waste ink tank through the filter. Can be discharged to a waste ink tank. Therefore, the ink jet device can be recovered without replacing the filter, and the life of the filter can be extended. Further, since there is no need to replace the filter, bubbles do not enter the ink flow path, and the purging operation for discharging the bubbles can be omitted.

  An ink jet apparatus 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a block diagram illustrating a configuration of an inkjet apparatus 1 according to the present embodiment. FIG. 2 is a cross-sectional view showing the inkjet head unit 8 of the inkjet apparatus 1 according to this embodiment. The ink jet apparatus 1 according to the present embodiment is a line type ink jet recording apparatus.

  As shown in FIG. 1, the inkjet apparatus 1 includes an ink tank 30, a flexible negative pressure maintaining container 31, a waste ink tank 40, a vacuum pump 50, and a plurality of inkjet head units 8 (see FIG. 1). Shows only the inkjet head units 8A and 8B.). The inkjet head units 8 are connected to each other by a pipe 72 and are connected to the negative pressure maintaining container 31 by a pipe 73 via a valve 63. The negative pressure maintaining container 31 is connected to the ink tank 30 via pipes 75 and 76 and valves 65 and 66, and is configured to maintain a negative pressure while receiving supply of degassed ink from the ink tank 30. ing. Further, the negative pressure maintaining container 31 supplies ink to each inkjet head unit 8 via the pipes 73 and 72 and the valve 63. Note that the ink flow direction at this time is particularly referred to herein as an “ink flow direction”. Each inkjet head unit 8 performs recording by spraying ink droplets onto the surface of a recording sheet (not shown) according to a recording signal while receiving the supply of ink distributed from the negative pressure maintaining container 31, and has the same configuration. Have

  As shown in FIGS. 1 and 2, each inkjet head unit 8 includes an inkjet head 10, a flexible temporary storage ink tank 32, and a filter 21. The inkjet head 10 is connected to the temporary storage ink tank 32 via valves 61 and 90, a connector 6, and a pipe 71. The filter 21 is connected to the temporary storage ink tank 32 via the valves 62 and 90, the connector 6, and the pipe 71, and is located upstream of the valve 62 in the ink flow direction. The temporary storage ink tank 32 is detachably connected to the main body of the inkjet head unit 8 by a connector 6 and is accommodated in a container (not shown) having an air communication port 92.

  In addition, there is no limitation in particular in the inkjet head 10 in this Embodiment, For example, a piezoelectric inkjet inkjet head, a bubble inkjet inkjet head, etc. can be used.

  As shown in FIG. 1, the inkjet apparatus 1 further includes a plurality of nozzle caps 20. Each nozzle cap 20 can be brought into close contact with a nozzle opening (not shown) of the corresponding inkjet head 10, and the corresponding inkjet head 10 is suction purged. Each nozzle cap 20 is connected to the waste ink tank 40 via valves 67 and 91 and a pipe 77. The pipe 72 is also connected to the waste ink tank 40 via a valve 64 and a pipe 74.

  The vacuum pump 50 is connected to the waste ink tank 40 via a pipe 78 and a valve 68. A leak valve 69 and a filter 22 are further connected to the vacuum pump 50 by a pipe 79.

  During the recording operation of the inkjet apparatus 1, the valves 61, 62, 63 are open and the valves 64, 90, 65 are closed, and the degassed ink stored in the negative pressure maintaining container 31 is pipe 73. , 72 is supplied to the inkjet head 10. When the deaerated ink stored in the negative pressure maintaining container 31 decreases as the recording operation continues, this state is detected by a sensor (not shown), and the valves 65 and 66 are opened and stored in the ink tank 30. The degassed ink is added to the negative pressure maintaining container 31 by the water head pressure, and then the valve 65 is closed. An appropriate amount of deaerated ink is always supplied to the negative pressure maintaining container 31 by the opening / closing control of the valve 65. By continuing the above operation, the inkjet head 10 at the recording operation position can continue the recording operation on the paper.

  On the other hand, if the recording operation is continued for a long time or a state where the recording operation is not performed for a long time continues, ink aggregates, dust, and the like accumulate in the filter 21 located on the upstream side of the inkjet head 10. Then, the amount of ink supplied from the negative pressure maintaining container 31 to the inkjet head 10 is reduced with respect to the amount of ink ejected from the inkjet head 10, and a negative pressure is generated in the inkjet head 10. If the negative pressure exceeds a certain level, ejection abnormalities or non-ejections occur in the inkjet head 10. Therefore, in the present embodiment, the operation of removing the foreign matter accumulated in the filter 21 is performed, and good ink ejection of the inkjet head 10 is maintained.

  Specifically, when the pressure detector (not shown) detects that the negative pressure on the upstream side of the inkjet head 10 exceeds the threshold value, the next foreign matter removing operation is performed.

  (1) First, the ink is filled from the ink tank 30 to the temporary storage ink tank 32 through the filter 21 with the valves 61 and 64 closed and the valves 62, 63, 65, 66 and 90 opened.

  (2) Next, with the valves 61, 63, 67, 69 closed and the valves 62, 64, 90 opened, the inside of the pipes 74, 72 is evacuated by the vacuum pump 50 through the pipe 78 and the waste ink tank 40. Then, the ink in the temporary storage ink tank 32 flows through the filter 21 in the direction opposite to the ink flow direction during the recording operation, and is discharged into the discharge ink tank 40. As a result, aggregates, dust, and the like accumulated in the filter 21 are discharged to the waste ink tank 40 together with the ink.

  (3) After that, by refilling the ink from the ink tank 30 to the temporary storage ink tank 32 with the valves 61 and 64 closed and the valves 62, 63, 65, 66 and 90 opened, the ink jet apparatus 1 is Return to the recording mode. That is, since the inside of the pipes 74 and 72 is evacuated in the operation (2), there is no ink in the pipes 74 and 72 at the end of the operation (2). Therefore, the ink can be filled into the pipe 72 by refilling the ink from the ink tank 30 to the temporary storage ink tank 32.

  As described above, according to the present embodiment, even when an ink having poor dispersion stability containing metal fine particles or the like as a pigment is used, the ink is accumulated in the filter 21 located on the upstream side in the ink flow direction of the inkjet head 10. Since aggregates, dust, and the like can be discharged to the waste ink tank 40, the life of the filter 21 can be extended. In addition, unlike the case where the filter 21 is replaced, since bubbles do not enter the ink flow path such as the pipe 72, it is not necessary to perform operations such as purging.

  Next, an ink jet device 2 according to a second embodiment of the present invention will be described with reference to FIG.

  The ink jet device 2 in the present embodiment has substantially the same configuration as the ink jet device 1 described above, but the filter 21 is installed upstream of the branch point A of the pipe 72 in the ink flow direction, and all the ink jet head units 108 are installed. However, it is different in that it is provided in common. Also in this configuration, the foreign matter on the filter 21 can be removed by the same operation as the operation in the first embodiment.

  Next, an ink jet apparatus 3 according to a third embodiment of the present invention will be described with reference to FIG.

  The ink jet device 3 in the present embodiment has substantially the same configuration as the ink jet device 2 described above, but differs in that only one temporary storage ink tank 32 is provided in common for all the ink jet head units 208. . Specifically, the temporary storage ink tank 32 is connected to the pipe 72 via the valve 90 and the connector 6 on the downstream side of the filter 21 in the ink flow direction. Further, the valve 62 is omitted. In this configuration, the foreign matter removing operation for removing the foreign matter accumulated in the filter 21 is performed as follows. The foreign matter removing operation is also performed when the negative pressure on the upstream side of the inkjet head 10 exceeds the threshold value by a pressure detector (not shown), as in the first embodiment.

  (1) First, ink is filled through the filter 21 from the ink tank 30 to the temporary storage ink tank 32 with the valves 61 and 64 closed and the valves 63, 65, 66 and 90 opened.

  (2) Next, with the valves 61, 63, 67, 69 closed and the valves 64, 90 open, the inside of the pipes 72, 74 is passed through the pipe 78 and the waste ink tank 40 using the vacuum pump 50. By drawing the vacuum, the ink in the temporary storage ink tank 32 is caused to flow in the direction opposite to the ink flow direction, and is discharged to the waste ink tank 40 through the filter 21. As a result, agglomerates and dust accumulated in the filter 21 are discharged to the waste ink tank 40.

  (3) Thereafter, the valves 61 and 64 are closed, and the valves 63, 65, 66, and 90 are opened to refill the ink from the ink tank 30 into the temporary storage ink tank 32. As a result, the pipe 72 is filled with ink, and the inkjet apparatus 3 returns to the state during the recording operation.

  As described above, according to the present embodiment as well, aggregates and dust accumulated in the filter 21 located on the upstream side of the ink-jet head 10 can be used even when ink having poor dispersion stability containing metal fine particles or the like as a pigment is used. Etc. can be discharged to the waste ink tank 40 without introducing bubbles into the ink flow path, and the life of the filter 21 can be extended.

  Next, an ink jet device 4 according to a fourth embodiment of the present invention will be described with reference to FIG.

  The ink jet device 4 in the present embodiment has substantially the same configuration as the ink jet device 1 described above, but the temporary storage ink tank 32, valves 61, 62, 90, and connector 6 include the ink jet head 10 and the filter 21. It differs in that it is provided between the branch point B of the pipe 77 to each inkjet head unit 308 and the nozzle cap 20 instead of between them. That is, the temporary storage ink tank 32 is connected to the waste ink tank 40 by the pipes 71 and 77 through the connector 6 and valves 90, 61 and 67, and the nozzle cap 20 through the connector 6 and valves 90 and 62. Also connected to.

  In such a configuration, the foreign matter accumulated in the filter 21 is removed by the next foreign matter removing operation. The foreign matter removing operation is also started when the negative pressure on the upstream side of the inkjet head 10 exceeds the threshold value by a pressure detector (not shown) as in the case of the first embodiment described above. The

  (1) First, the cap 20 is brought into close contact with the inkjet head 10, the valves 62, 64, 69 are closed, the valves 61, 67, 68, 90 are opened, and the piping 78 and the waste ink tank 40 are connected by the vacuum pump 50. Accordingly, the piping 77 and the temporary storage ink tank 32 are evacuated to discharge the ink in the temporary storage ink tank 32 into the exhaust ink tank 40. Next, ink is filled from the ink tank 30 into the temporary storage ink tank 32 with the valves 61 and 64 closed and the valves 62, 63, 65, 66 and 90 opened.

  (2) Next, with the valves 61, 63, 67, 69 closed and the valves 62, 64, 68, 90 opened, the vacuum pump 50 uses the pipe 78 and the waste ink tank 40 to pass through the pipe 72, 74, the inkjet head 10 and the nozzle cap 20 are evacuated, the ink in the temporary storage ink tank 32 is allowed to flow through the filter 21, and is discharged into the waste ink tank 40. As a result, aggregates and dust accumulated in the filter 21 are discharged into the waste ink tank 40.

  (3) Then, with the valves 61 and 64 closed and the valves 62, 63, 65, 66, and 90 opened, the ink is refilled from the ink tank 30 to the temporary storage ink tank 32 through the filter 21. As a result, the pipes 72 and 74 are filled with ink, and the inkjet apparatus 4 returns to the state during the recording operation.

  As described above, according to the present embodiment as well, aggregates and dust accumulated in the filter 21 located on the upstream side of the ink-jet head 10 can be used even when ink having poor dispersion stability containing metal fine particles or the like as a pigment is used. And the like can be discharged to the discharge ink tank 40, so that the life of the filter 21 can be extended. Further, since the filter 21 can be recovered without introducing bubbles into the ink flow path, the trouble of performing purging or the like can be saved.

  Only in the fourth embodiment, the ink in the temporary storage ink tank 32 is discharged into the waste ink tank 40 before the ink is filled from the ink tank 30 into the temporary storage ink tank 32 by the operation (1). The reason is as follows. That is, in the ink jet device 4 according to the fourth embodiment, the temporary storage ink tank 32 is located downstream of the nozzle cap 20 in the ink flow direction. Is in a state of air. For this reason, even if an attempt is made to fill the temporary storage ink tank 32 without discharging the ink in the temporary storage ink tank 32, the filling of the ink is delayed due to the air. In addition, when ink containing bubbles enters the temporary storage ink tank 32, when the ink is discharged by the operation (2), bubbles enter the inkjet head 10 and the like, causing a discharge failure. Therefore, by discharging the ink in the temporary storage ink tank 32 to the waste ink tank 40 in the operation (1), such a bad effect can be prevented.

  On the other hand, in the first to third embodiments, the temporary storage ink tank 32 is located upstream of the nozzle cap 20 in the ink flow direction, so that the temporary storage ink tank 32 is always free of bubbles. It has become. Therefore, even if the ink discharging operation is not performed in the operation (1), bubbles do not enter the inkjet head 10 or the like.

  The ink jet apparatus according to the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims.

  For example, in any of the first to fourth embodiments described above, the ultrasonic storage means is provided in the temporary storage ink tank 32, and the ink in the temporary storage ink tank 32 is ultrasonicated before the operation (2). May be redispersed. This can prevent the filter 21 from being clogged with aggregates from the ink jet head 10 side.

  Further, a pressurizing unit that pressurizes the temporary storage ink tank 32 may be provided, and the ink may be discharged to the waste ink tank 40 by pressurization as the operation (2). According to this, since the ink can be flowed at a higher pressure as compared with the case where the ink is discharged by the negative pressure, the foreign matter in the filter 21 can be more effectively removed. In addition, since the pipes 74 and 72 are not evacuated, the pipes 74 and 72 are already filled with ink at the end of the ink discharging operation to the waste ink tank 40. Therefore, the operation (3) for filling the pipes 72 with ink is unnecessary, and the foreign matter removing operation can be performed in a short time.

  Further, instead of the operation (1), the temporary storage ink tank 32 may be removed from the connector 6 with the valve 90 closed and replaced with the temporary storage ink tank 32 filled with new ink. Alternatively, instead of the temporary storage ink tank 32 filled with new ink, the tank may be replaced with a tank filled with a cleaning liquid not containing pigment. When the tank is replaced with a cleaning liquid, there is no fear that the filter 21 is clogged with aggregates from the inkjet head 10 side during the operation (2). Then, by refilling the ink from the ink tank 30 to the temporary storage ink tank 32 by the operation (3), the cleaning liquid remaining in the pipe 72 can be swept away and the ink can be filled in the pipe 72. Can be restored to the state during recording operation.

  The present invention can be applied to an ink jet apparatus using an ink having poor dispersibility such as metal fine particles dispersed, and can be applied to, for example, a marking application using a white ink by ink jet or a metal wiring application.

1 is a block diagram showing an ink jet apparatus according to a first embodiment of the present invention. 1 is a cross-sectional view of an ink jet head of an ink jet apparatus according to a first embodiment of the present invention. The block diagram which shows the inkjet apparatus by the 2nd Embodiment of this invention. The block diagram which shows the inkjet apparatus by the 3rd Embodiment of this invention. The block diagram which shows the inkjet apparatus by the 4th Embodiment of this invention.

Explanation of symbols

1, 2, 3, 4, .. Inkjet device, 6 .. Connector,
8. ・ Inkjet head unit, 10. ・ Inkjet head,
20 ・ ・ Nozzle cap, 21, 22 ・ ・ Filter,
30 .. Ink tank, 31 .. Negative pressure maintenance container, 32 .. Temporary storage ink tank,
40 ... Waste ink tank 50 ... Vacuum pump
61, 62, 63, 64, 65, 67, 68, 69, 90, 91..Valve
71, 72, 73, 74, 75, 77, 78, 79 ... piping, 92 ... air communication port

Claims (12)

An inkjet head that ejects ink;
An ink tank for holding ink;
Ink supply means configured to maintain a negative pressure to supply ink to the inkjet head;
An ink path connecting the inkjet head, the ink supply means and the ink tank;
An ink jet apparatus comprising: a filter provided on the ink path and between the ink jet head and the ink supply means;
A waste ink tank connected to the ink path between the ink supply means and the filter;
A temporary storage ink tank that is connected to the ink path between the inkjet head and the filter and holds ink discharged to the waste ink tank during a foreign matter removing operation ;
The temporary storage ink tank is connected to the ink path via a first valve, the waste ink tank is connected to the ink path via a second valve, and the inkjet head and the filter An ink-jet apparatus connected through a valve . A plurality of inkjet heads, a plurality of filters respectively corresponding to the plurality of inkjet heads, and a plurality of temporary storage ink tanks respectively corresponding to the plurality of inkjet heads, each inkjet head passing through the corresponding filter ink jet apparatus according to claim 1 Symbol mounting, characterized in that it is connected to the waste ink tank.
A plurality of ink-jet heads and a plurality of temporary storage ink tanks respectively corresponding to the plurality of ink-jet heads, the filter being provided in common to all of the plurality of ink-jet heads, and each ink-jet head having the common filter through being connected to the waste ink tank 請 Motomeko 1 Symbol mounting of the ink jet device you characterized. A plurality of inkjet heads are provided, and the filter and the temporary storage ink tank are provided in common to all the inkjet heads, and each inkjet head is connected to the waste ink tank via the common filter. inkJet device 請 Motomeko 1 Symbol placement you characterized. By pulling at least a portion of the ink path in vacuum, claim 1, characterized in that the ink of the temporary storage ink tank, further comprising negative pressure means to discharge into the waste ink tank through the filter The inkjet device according to any one of 1 to 4 . The pressurized temporary storage ink tank, the ink of the temporary storage ink tank, 請 Motomeko 1 to 4 via the filter you further comprising a pressurizing means to discharge into the waste ink tank The inkjet apparatus according to any one of the above. An inkjet head for recording by discharging ink;
An ink tank for holding ink; an ink supply means for supplying ink to the inkjet head;
An ink path connecting the inkjet head, the ink supply means and the ink tank;
A filter provided on the ink path and between the inkjet head and the ink supply means;
A purge cap for sucking and purging the inkjet head, and an inkjet apparatus comprising:
A waste ink tank connected to the ink path between the ink supply means and the inkjet head;
A temporary storage ink tank that is connected to the purge cap and holds ink discharged to the waste ink tank during a foreign matter removing operation;
The temporary storage ink tank is connected to an ink path between the purge cap and the waste ink tank via a first valve, and the waste ink tank is connected to the ink path via a second valve; The inkjet apparatus, wherein the purge cap and the waste ink tank are connected via a third valve . A plurality of inkjet heads, a plurality of filters respectively corresponding to the plurality of inkjet heads, and a plurality of temporary storage ink tanks respectively corresponding to the plurality of inkjet heads, each inkjet head passing through the corresponding filter The inkjet apparatus according to claim 7 , wherein the inkjet apparatus is connected to a waste ink tank. Negative pressure means for discharging the ink in the temporary storage ink tank to the waste ink tank through the purge cap, the inkjet head, and the filter by pulling at least a part of the ink path to a vacuum. ink jet apparatus according to 請 Motomeko 7 or 8 you, further comprising a. The apparatus further includes a pressurizing unit that pressurizes the temporary storage ink tank and discharges the ink in the temporary storage ink tank to the waste ink tank through the purge cap, the inkjet head, and the filter. ink jet apparatus according to 請 Motomeko 7 or 8 characterized. Ink jet apparatus according to any one of 請 Motomeko 1 to 10 you, further comprising an ultrasonic means for applying ultrasonic vibration to said temporary storage ink tank. Ink jet apparatus according to any one of 請 Motomeko 1 to 11 that the temporary storage ink tank to characterized in that it has a flexibility.

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