JP2007160875A - Inkjet recorder, and inkjet recording head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To do with one tank used for ejection parts of the same color so as to miniaturize and reduce in price a printer which can print in both directions at a high speed, and to enhance the reliability related to ink filling/feeding. <P>SOLUTION: Bit-in feeding is carried out from a main tank to sub tanks which respectively communicate with nozzle arrays of the same color used in two-way printing. At this time, an ink passage is bifurcated, and the ink is supplied to each of the sub tanks. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an inkjet printing apparatus, and more particularly to an inkjet printing apparatus that can replenish ink from an ink tank to a stored ink tank as needed, and an inkjet recording head mounted thereon.

  In a printing apparatus, particularly an inkjet printing apparatus, an improvement in recording speed in color printing is an important theme. As a method for improving the recording speed, in addition to increasing the length of the recording head, improvement of the recording (driving) frequency of the recording head, bidirectional printing, and the like are common. Bidirectional printing is an effective means in terms of cost as a total system because the required energy is dispersed over time when obtaining the same throughput as compared with unidirectional printing.

As a configuration of the ink jet recording head, Japanese Patent Publication No. 3-77066 discloses a configuration in which a forward pass nozzle and a return pass nozzle are prepared. In this publication, the used head (discharge section) is switched between the forward path and the return path so that the order of placing the respective colors is the same, and the configuration of the recording head section is Y (yellow), M (magenta), This is a combination of recording heads that eject C (cyan) and Bk (black) inks. Specifically, as shown in FIG. 3 of the publication, the heads are arranged in the order of Bk, C, M, Y, M, C, and Bk in both the forward scanning and the backward scanning directions. Yes. Ink is supplied to each head unit from each color ink tank via a pipe for each head.
Japanese Patent Publication No. 3-77066 JP 2002-86730 A

  However, in such a configuration, there is a problem that the device becomes large because it is necessary to secure a space by scooping the ink supply pipe and to remove bubbles in the pipe.

  Therefore, in order to reduce the size, consider a configuration in which an ink tank is mounted for each head, the head and the ink tank are installed on a carriage, and bidirectional scanning is performed with the arrangement of each color ejection unit as described in the above publication. There arises a problem that the apparatus becomes larger due to an increase in size and weight of the carriage, and a problem that depending on the configuration, the number of parts increases and the cost increases. In addition, since a plurality of ink tanks are used with the same color, the number of ink tanks required at the initial stage of operation is large, and the initial investment increases. Further, in this case, when any of the plurality of ink tanks of the same color becomes empty and needs to be replaced, there is a problem that it is difficult for the user to simply understand which tank to replace.

  In order to solve the above problem, if one tank is used to supply liquid to the discharge unit that discharges the same color in the above configuration, the liquid supply path from one tank to the discharge unit of the same color is in the middle. There is a concern that the ink supply characteristics and thus the ink ejection characteristics may be different between ejection sections of the same color. That is, if the resistance component (pressure loss: determined by the supply path length, supply path cross-sectional area, maximum flow velocity, ink viscosity, etc.) generated by the ink flow from the ink tank to each ejection unit during ink supply is increased, printing is performed. May have an effect.

  In Japanese Patent Laid-Open No. 2002-86730, in a configuration in which a head and an ink tank are installed on a carriage, the ink supply path from the tank to the same color ejection section is branched, and the length of the ink flow path after branching is set. A small bidirectional printing apparatus is disclosed in which the tanks used for the discharge portions of the same color can be covered by one by making them equal. As shown in FIG. 4 of Japanese Patent Laid-Open No. 2002-86730, the configuration of the recording head unit includes a discharge unit for discharging Y (yellow), M (magenta), and C (cyan) inks in one chip. A discharge portion for discharging Bk (black) ink is formed on another chip, and these are incorporated in one head. The arrangement and length of the ejection units are configured so that Bk, C, M, Y, M, C, and Bk are in the order of both the forward scan and the backward scan. When filling the head with ink, the chip on which the discharge part for discharging Y, M, and C inks is formed is sealed with the same cap, and the chip on which the Bk discharge part is formed is sealed with another cap. The pressure is reduced by a pump and ink is filled in each discharge portion. Since the ink supply path from the tank to the same color ejection section is branched and the lengths of the ink flow paths after the branching are equal, the ink filling properties to these same color ejection sections are the same. However, in the configuration in which the head and the ink tank are installed on the carriage, the ink tank normally stores ink that can withstand about 1000 sheets of printing, and the Bk, C, M, and Y inks, the ink tank, and the ink tank are stored. When the holding members and the like are combined, the weight of the carriage including the head becomes considerable. In this case, in order to achieve the high-speed printing demanded in the market in recent years, a high-torque carriage motor, a high-accuracy and high-rigidity carriage shaft, etc. must be adopted, which causes high costs. .

  An object of the present invention is to provide a single tank used for the same color discharge unit in order to reduce the size and cost of a printing apparatus capable of bidirectional printing at high speed in view of the above-described problems of the prior art. It is an object of the present invention to provide an ink jet recording head and an ink jet recording apparatus which can be used and have high reliability related to ink filling and supply.

  In order to solve the above problems, an ink jet recording apparatus of the present invention has the following configuration.

  1. The storage ink tank provided in the ink jet recording head of the carriage has ink replenishing means for replenishing ink from the ink tank fixed to the ink jet recording apparatus main body as necessary, and recording of a predetermined color during the forward movement of the carriage At least a first recording unit for recording the predetermined color when the carriage is restored, and the first and first recording units communicate independently of each other. An ink jet recording apparatus having a storage tank is characterized in that two ink lead-out portions corresponding to the ink introduction portion communicated with the storage tank merge inside and communicate with the ink tank.

  2. The 1a and 1b recording sections are arranged symmetrically with respect to the conveyance direction of the recorded matter, respectively.

  3. It has an ink lead-out portion that communicates with the ink tank and an ink introduction portion that communicates with the storage ink tank, and the ink is replenished by connecting the ink lead-out portion and the ink introduction portion when ink is replenished. To do.

  4). A storage ink tank that supplies ink to the recording portion of an ink jet recording head and replenishes ink from the ink tank by introducing negative pressure therein, and suction that introduces negative pressure for ink replenishment The part has gas-liquid separation means for allowing gas to pass through without passing ink.

  5. The fluid resistances of the respective flow paths from the independent storage tank communicating with the recording sections of the first 1a and 1b to the ink tank are different. In such an ink jet recording apparatus, since the ink jet recording head is equipped with a sub-tank having a capacity necessary for printing a predetermined number of sheets, the ink jet recording head is small, and since one ink tank is mounted for each color, the conventional recording unit is arranged symmetrically. Therefore, it is possible to perform an operation that is easy for the user to understand. In addition, since the recording unit is arranged so that the color printing order is the same during bidirectional printing, high-speed and high-quality comfortable printing is possible.

  Further, when ink is supplied from the ink tank to the storage ink tank, the storage ink tank has a gas-liquid separation unit, so that it is not affected by the resistance component generated by the ink flow. Furthermore, the difference in filling amount due to the difference in storage tanks, the unevenness of the ink filling amount to the storage tanks of the same color, the reliability related to ink filling and supply, etc. are not impaired.

  As described above, the ink jet recording apparatus and the ink jet recording head of the present invention are small and have only one ink tank for each color. Operation that is easy for a person to understand. In addition, since the recording unit is arranged so that the color printing order is the same during bidirectional printing, high-speed and high-quality comfortable printing is possible.

  Further, when ink is supplied from the ink tank to the sub-tank, the sub-tank has gas-liquid separation means so that it is not affected by the resistance component generated by the ink flow. Furthermore, the difference in filling amount due to the difference in sub-tank, the deviation of the ink filling amount to the storage tank of the same color, the reliability related to ink filling / supplying, etc. are not impaired.

  In addition, since the ink filling into the sub-tank that stores two identical inks involved in reciprocating printing is performed with a time difference, the ink flow rate from the ink tank is the same as that of the other inks even when filling with high viscosity ink. In addition, the reliability related to ink filling and supply is not impaired.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a view of an ink jet printer 111 according to a first embodiment of the present invention as viewed from directly above. In the figure, 101 is a carriage that clamps the ink jet recording head, 102 is a shaft of the carriage 101, 103 is a belt for transmitting the power of the carriage motor 104 to the carriage 101, and driving the carriage 101 along the shaft 102, 105 An LF motor 107, a transport roller that accurately feeds the medium 106 by the power of the LF motor 105, an automatic feeding unit (hereinafter referred to as an ASF unit) 108 for feeding the media 106 to the transport roller 107, and 109 for driving the ASF unit 110 is a cam for feeding the medium 106 by the power of the paper feed motor 109, 112 is a cap related to recovery operation and moisture retention of the ink jet recording head, and 113 is an ink supply for supplying ink to the ink jet recording head. Yu , 114 is an ink supply needle for supplying ink to the ink jet recording head side, 116 is a suction needle for suction used when drawing ink into a storage ink tank (sub tank), and 115 is connected to the ink supply needle 114. This is an ink tank. For simplicity, the electrical system, cover, sensor, fixing member, recovery system operating unit, valves provided in the recovery system and the ink supply system, and the like are omitted. Depending on the amount of ink consumed during printing, the ink jet recording head contacts the ink supply unit 113 at the paper feed timing (hereinafter referred to as pit-in) and is supplied with ink. The pit-in operation may be performed when the number of ink ejected dots is counted to reach a predetermined value, or an ink remaining amount detecting mechanism is provided in a sub-tank provided in the ink jet recording head to be a predetermined remaining amount. This may be done by detecting that. In this embodiment, the method was performed by counting the number of ink ejection dots.

  FIG. 2 is a view in which a surface (face surface) provided with an ink discharge port (hereinafter referred to as a nozzle) of an ink jet recording head clamped on the carriage 101 is viewed from directly below. In the figure, 201 is an ink jet recording head, 203 is an ink introduction part that receives ink supply from an ink tank 115 provided in the ink jet printer 111 via an ink supply needle 114 during a pit-in operation, and 202 is a suction that receives a suction needle 116. This is the introduction part. The ink supplied from the ink introduction unit 203 is stored in a sub tank (not shown) in the ink jet recording head 201, and then passes through a filter (not shown) and a groove (not shown) formed in the flow path plate 210. It reaches the discharge unit 221 via a rubber (not shown). The discharge unit 221 has a main body 111 through a ceramic substrate 207, an inkjet chip 205 bonded thereon and patterned with ink discharge elements and nozzles, a flexible electric substrate 204, and a connector terminal provided on the carriage 101 connected to the flexible substrate 204. Printed circuit board (not shown) for exchanging electrical signals to and from, spacer 209 for adjusting the height of the electrical connection between the inkjet chip 205 and the flexible electrical board 204, and the electrical connection part between the inkjet chip 205 and the flexible electrical board 204 The sealant 206 is made of. A screw hole boss stands on the holder 222, and a hole 224 through which the flow path plate 210 escapes is provided. The discharge unit 221 is fixed to the holder 222 with two screws 208. The inkjet chip 205 is provided with six independent nozzle rows. In this embodiment, since one inkjet chip 205 is used for the inkjet recording head 201, a total of six nozzle rows 211 to 216 are used. It is possible.

  FIG. 3 is an enlarged view of the portion of FIG. 2A of the nozzle row 216. In FIG. 3, 226 is an ink supply port formed by anisotropic etching on a silicon substrate, and 227 is an ink discharge port formed by patterning on the silicon substrate. A heater 229 which is an energy element for supplying ink, an ink flow channel groove for supplying ink to the nozzle 225, a foaming chamber 230 for heating the ink by the heater 227 and bubbling the ink when discharging ink, and 228 each foaming A partition wall that divides the room. In the present embodiment, nozzles arranged at intervals of 600 dpi are arranged on both sides of the ink supply port 226 while being shifted by 1200 dpi to form the nozzle row 216. The same applies to the nozzle rows 211 to 215.

  FIG. 4 is a diagram illustrating a component configuration of the ink jet recording head 201. The ink jet recording head 201 is roughly composed of a discharge unit 221, a sub tank unit 303, a sealing rubber 306, and a screw 208. Reference numeral 302 constituting the discharge unit 221 is a printed circuit board that exchanges electrical signals with the main body 111. The sub tank unit 303 includes an ink supply unit 311, an absorber 310, and a holder unit 315. The ink supply unit 311 is filled with the ink introduction unit 203, the suction introduction unit 202, the ink supply pipe 312 for supplying the ink to the absorber 310 by sucking the ink sucked from the ink introduction unit 203, and the absorber 310. A gas-liquid separation membrane 313 is provided to prevent the ink from being sucked toward the suction introducing portion 202 when the ink is discharged. In this embodiment, urethane foam is used as the absorber 310, but the present invention does not limit the absorber that generates negative pressure. The holder unit 315 includes a holder 222, a flow path plate 210, and a filter (not shown). The flow path plate 210 is first welded to the holder 222, and then the filter is welded to form the holder unit 315. Next, a partition is provided at a place where the absorber 310 of the holder unit 315 is accommodated. After the absorber 310 is inserted therein, the ink supply unit 311 is covered from above, and the ink supply unit 311 and the holder unit 315 are joined. -Seal and complete the sub tank. In this example, joining and sealing were performed simultaneously with an epoxy adhesive. In this embodiment, a foam is used as a mechanism for generating a negative pressure in the sub tank. However, the negative pressure may be generated by an ink bag using an elastic member, and the present invention is not limited to this. The ink in the sub tank passes through the groove formed by welding the holder 222 and the flow path plate 210, and then reaches the discharge unit 221 from the ink supply pin 305 through the seal rubber 306 in which the corresponding hole 307 is formed. The ink supply unit 221 is fixed to the screw hole 308 of the screw hole boss 314 provided in the holder 222 with two screws 208.

  FIG. 5 is a top view of the ink jet recording head 201, and shows the arrangement of the ink supply groove 401 that communicates with the ink introduction part 203 inside the ink supply unit 311 and the suction groove 402 that communicates with the suction introduction part 202. In the figure, 403 is an opening communicating with the gas-liquid separation membrane, and 404 is an opening communicating with the ink supply pipe 312. In this embodiment, the ink introduction part 203 and the ink supply groove 401 are arranged so that cyan ink and magenta ink can be supplied to the forward printing subtank and the reverse printing subtank. Therefore, the color order of the nozzle arrays 211 to 216 in FIG. 2 is arranged so that 211 and 216 are cyan, 212 and 215 are magenta, 213 is black, and 214 is yellow. In this embodiment, the color order is arranged in this way, but black may be the nozzle rows 211 and 220, and the present invention does not limit the color.

  6 is a cross-sectional view taken along the line AA in FIG. 5. In FIG. 6, reference numeral 501 denotes a filter for removing ink dust, and reference numeral 503 denotes a groove for supplying ink to the discharge unit 221 formed on the flow path plate 210. , 405 and 406, 407, and the gas-liquid separation film 313 are components constituting the ink supply unit 311.

  FIG. 7 is a drawing showing the BB cross section of FIG. 5, in which 601 is an elastic member for sealing the suction needle 116 when it is inserted during the pit-in operation, and the diameter of the central portion is larger than that of the suction needle. The suction groove 402 is kept open to the atmosphere except during the pit-in operation. FIGS. 8A and 8B are diagrams schematically showing this state. FIG. 8A shows a state when the suction needle 116 is not inserted, and FIG. 8B shows a state when the suction needle 116 is inserted. In the drawing, reference numeral 701 denotes a hole provided in the elastic member 601 having a diameter smaller than that of the suction needle, 702 denotes a hollow portion for sucking ink provided in the suction needle 116, and 703 denotes a taper provided in the suction needle 116. Part. As shown in FIG. 8B, when the suction needle 116 is inserted into the suction introduction portion 202, the tapered portion 703 of the suction needle 116 comes into contact with the tapered portion of the elastic member 601, and the hollow portion 702 and the suction groove are formed. Airtightness with 402 is maintained.

  The ink introduction unit 203 and the ink supply needle 114 are basically configured in the same manner as the suction introduction unit 202 and the suction needle 116, but in order to prevent the ink from being thickened and fixed in the ink supply groove 401, The elastic member is provided with a slit instead of a hole, and is closed when the ink supply needle 114 is not inserted. This situation is shown in FIG. In the figure, 804 is an elastic member of the suction introducing portion 203, 801 is a slit provided in the elastic member 804, 802 is a hollow portion for ink supply provided in the ink supply needle 114, and 803 is in the ink supply needle 114. It is a provided taper.

  FIG. 13 is a perspective view of an ink supply unit 113 for supplying ink to the inkjet recording head. The ink supply unit 113 of this embodiment is formed by vibration welding two parts 901 and 902. The ink supply needle 114 and the suction needle 116 are integrally formed when the component 901 is molded. The ink tube connection port 903 to which the tube communicating with the ink tank is connected and the negative pressure tube to which the tube communicating with the negative pressure generator is connected. The connection port 904 is formed integrally with the component 902 at the time of molding. FIG. 14 is a drawing showing the arrangement of the ink flow paths of the ink supply unit 113, in which 906 is a hole communicating with the negative pressure tube connection port 904, 905 is a hole communicating with the ink tube connection port 903, Reference numeral 907 denotes a rib for preventing leakage of ink and negative pressure, and maintains airtightness by welding to the component 901 during vibration welding. Reference numerals 908 and 911 denote ink flow channel grooves for cyan ink and magenta ink, respectively, which are bifurcated. Reference numerals 909 and 910 denote ink channel grooves for black ink and yellow ink, respectively.

  Next, how ink is supplied to the sub-tank will be described with reference to the drawings, taking cyan as an example of two sub-tanks. FIGS. 10 to 12 show a cross section (a) of a sub-tank for supplying cyan ink to a nozzle array for cyan forward or backward printing, and for supplying cyan ink to a nozzle array for cyan backward or forward printing. It is drawing which shows the mode of the ink supply of the cross section (b) of a subtank. First, the pit-in inkjet recording head is sealed with the cap 112 at the nozzle side, and suction is started from the suction needle 116 with the ink supply needle 114 and the suction needle 116 inserted. The suction needle communicates with the suction groove 402 and the opening 403, and through the gas-liquid separation film 313, the sub tank, the ink supply pipe 312, and the ink supply groove 401 are brought into a negative pressure state, and ink is sucked. At this time, as shown in FIG. 10, among the two sub-tanks of cyan ink, the ink is first supplied to the ink supply path that is relatively short (a), and at this time (b) In this case, ink filling is not started. As shown in FIG. 11, when the absorber 310 of the (a) side sub tank is filled with cyan ink and reaches the gas-liquid separation film 313, the filling of the cyan ink into the (a) side sub tank stops, and (b) Filling the side sub tank with cyan ink is started. Then, as shown in FIG. 12, when the absorber 310 of the sub tank on the (b) side is filled with cyan ink and reaches the gas-liquid separation film 313, the ink filling ends. At this time, a small amount of suction recovery may be performed from the cap 112 side, and ink filling of the ink flow path from the filter to the nozzle may be performed reliably.

Drawing of an inkjet recording apparatus according to the present invention Drawing of inkjet recording head mounted on inkjet recording apparatus according to the present invention The enlarged view of the nozzle part of the inkjet recording head mounted in the inkjet recording device by this invention The perspective view of the inkjet recording head mounted in the inkjet recording device by this invention The drawing which shows arrangement | positioning of the suction groove and the ink flow path groove | channel of the inkjet recording head mounted in the inkjet recording device by this invention AA sectional view of FIG. BB sectional view of FIG. Sectional drawing which shows mounting | wearing / non-mounting | wearing state of the suction needle to the inkjet recording head mounted in the inkjet recording device by this invention Sectional drawing which shows the non-mounting state of the ink supply needle | hook to the inkjet recording head mounted in the inkjet recording device by this invention Sectional drawing which shows the state of the ink filling to the sub tank filled with the same ink in connection with bidirectional printing Sectional drawing which shows the state of the ink filling to the sub tank filled with the same ink in connection with bidirectional printing Sectional drawing which shows the state of the ink filling to the sub tank filled with the same ink in connection with bidirectional printing The perspective view of the ink supply unit 113 of the inkjet recording apparatus by this invention. The drawing showing the arrangement of the ink flow paths of the ink supply unit 113 of the ink jet recording apparatus according to the present invention

Explanation of symbols

101 Carriage 102 Shaft 103 Belt 105 LF Motor 106 Media 107 Transport Roller 108 Automatic Paper Feed Unit (ASF Unit)
DESCRIPTION OF SYMBOLS 109 Paper feed motor 110 Cam 112 Cap 113 Ink supply unit 114 Ink supply needle 115 Ink tank 116 Suction needle 201 Inkjet recording head 202 Suction introduction part 203 Ink introduction part 204 Flexible electric substrate 205 Inkjet chip 206 Sealant 207 Ceramic substrate 208 Screw 209 Spacer
210 Channel plate 210
211 to 216 Nozzle row 221 Discharge unit 222 Holder 224 Hole 226 Ink supply port 227 Heater 228 Partition wall 229 Ink flow channel 230 Foaming chamber,
302 Printed circuit board 303 Sub tank unit 305 Ink supply pin 306 Seal rubber 306 Rubber for seal 307 Hole 308 Screw hole 310 Absorber 311 Ink supply unit 312 Ink supply pipe 312
313 Gas-liquid separation membrane 313
314 Screw hole boss 315 Holder unit 401 Ink supply groove 402 Suction groove 403 Opening communicating with gas-liquid separation film 404 Opening communicating with ink supply pipe 312 405 to 407 Parts constituting ink supply unit 501 Filter 503 Ink to discharge unit 601 Elastic member 701 of suction introduction part 701 Hole provided in elastic member 601 702 Hollow part of suction needle 703 Tapered part provided in suction needle 801 Slit provided in elastic member 804 802 Ink supply Needle hollow portion 803 Taper of ink supply needle 804 Elastic member of suction introduction portion 901, 902 Components constituting ink supply unit 903 Ink tube connection port to which tube communicating with ink tank is connected 904 Communicating with negative pressure generating device Tube is connected Pressure tube connection port 905 Hole communicating with ink tube connection port 903 906 Hole communicating with negative pressure tube connection port 904 907 Rib for preventing leakage of ink and negative pressure 908 Cyan ink ink channel groove 909 Black ink Ink channel groove 910 Yellow ink ink channel groove 911 Magenta ink ink channel groove

Claims (11)

The storage ink tank provided in the ink jet recording head of the carriage has ink replenishing means for replenishing ink from the ink tank fixed to the ink jet recording apparatus main body as necessary, and recording of a predetermined color during the forward movement of the carriage At least a first recording unit for recording the predetermined color when the carriage is restored, and the first and first recording units communicate independently of each other. In an inkjet recording apparatus having a storage tank,
2. An ink jet recording apparatus, wherein two ink lead-out portions corresponding to an ink introduction portion communicating with the storage tank merge inside to communicate with the ink tank.   2. The ink jet recording apparatus according to claim 1, wherein the first and first recording units are symmetrically arranged with respect to the conveyance direction of the recorded matter.   An ink lead-out portion that communicates with the ink tank and an ink lead-in portion that communicates with the stored ink tank, and the ink lead-out portion and the ink lead-in portion are connected when the ink is replenished. The ink jet recording apparatus according to claim 1 or 2, characterized in that   The storage ink tank that supplies ink to the recording unit of the ink jet recording head and replenishes ink from the ink tank by introducing negative pressure therein, and introduces negative pressure for ink replenishment The ink jet recording apparatus according to any one of claims 1 to 3, further comprising a gas-liquid separating unit that allows gas to pass through the suction portion that does not pass ink.   The ink jet recording apparatus according to any one of claims 1 to 4, wherein the fluid resistance of each flow path from the independent storage tank communicating with the first and first recording units to the ink tank is different. The storage ink tank provided in the ink jet recording head of the carriage has ink replenishing means for replenishing ink from the ink tank fixed to the ink jet recording apparatus main body as necessary, and recording of a predetermined color during the forward movement of the carriage At least a first recording unit for recording the predetermined color when the carriage is restored, and the first and first recording units communicate independently of each other. In an inkjet recording apparatus having a storage tank,
2. An ink jet recording apparatus, wherein two ink lead-out portions corresponding to an ink introduction portion communicating with the storage tank merge inside to communicate with the ink tank. The storage ink tank provided in the ink jet recording head of the carriage has ink replenishing means for replenishing ink as needed from the ink tank fixed to the ink jet recording apparatus main body. A 1a recording unit for performing recording, a 2a recording unit for performing recording of the second color, a 1b recording unit for performing recording of the first color during the carriage return operation, and a recording of the second color. An ink jet recording apparatus having an independent storage tank that communicates with each of the recording units 1a, 2a, 1b, and 2b.
An ink jet recording apparatus, wherein an ink lead-out portion corresponding to an ink introduction portion communicating with the storage tank joins inside and communicates with the first color ink tank and the second color ink tank, respectively.   8. The ink jet recording apparatus according to claim 7, wherein the recording portions of the first 1a and 1b and the second 2a and 2b are symmetrically arranged with respect to the conveyance direction of the recorded matter.   An ink lead-out portion that communicates with the ink tank and an ink lead-in portion that communicates with the stored ink tank, and the ink lead-out portion and the ink lead-in portion are connected when the ink is replenished. 10. An ink jet recording apparatus according to claim 7, wherein the ink jet recording apparatus is characterized.   The storage ink tank that supplies ink to the recording unit of the ink jet recording head and replenishes ink from the ink tank by introducing negative pressure therein, and introduces negative pressure for ink replenishment The ink jet recording apparatus according to claim 7, further comprising a gas-liquid separation unit that allows gas to pass through the suction unit that does not pass ink.   The fluid resistance of each flow path from an independent storage tank communicating with said 1a and 1b and / or said 2a and 2b recording sections to said ink tank is different. The ink jet recording apparatus according to 7 to 10.

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