CN1362331A - Ink suction device, ink jet recording head restoring device, ink jet recording device and ink suction method - Google Patents

Abstract

The invention discloses an inkjet recording device in which a negative pressure box is arranged between a pipe provided with a valve and a pipe provided with a pump. After the cover is in contact with and tightly attached to the ink discharge surface of the recording head, the valve is closed to block the flow of fluid in the tube. Then, if the pump is driven, the pipe is decompressed by driving the pump from the valve to the negative pressure tank, in the negative pressure tank, and from one end of the pipe to the position where the roller first contacts the pipe, and negative pressure occurs. When the valve is opened after the drive of the pump is stopped, this negative pressure acts momentarily in the cap for ink suction. Make this negative pressure a large attraction force to attract ink from the recording head unit.

Description

Ink suction device, inkjet recording head recovery device, inkjet recording device and ink suction method

technical field

The present invention relates to an ink suction device that sucks ink from an ink discharge port of an ink jet recording head that discharges ink droplets onto a recording medium based on image information, and an ink jet recording head recovery device equipped with the ink suction device, equipped with the ink jet recording head An inkjet recording apparatus of an inkjet recording head recovery apparatus, and an ink suction method whereby an ink suction means sucks ink from an ink discharge port of the inkjet recording head.

Background technique

In the inkjet recording apparatus based on image information, ink droplets are discharged onto recording media such as paper to record images from the ink discharge port of the inkjet recording head, some are configured to suck the inside of the inkjet recording head by the suction device (especially is the remaining ink or foreign matter (dust, air bubbles, etc.) in the nozzle, thereby restoring the inkjet recording head to the state most suitable for the discharge of ink droplets. For example, in the recovery method of the inkjet recording apparatus described in Japanese Patent Publication No. 2831804, the pressure roller 114 is rotated around the pump shaft 112, whereby the tube 118 is forcibly squeezed, the ink in the nozzle is sucked and sent. to the waste ink absorber (Figure 6).

However, in such a configuration in which the pressure roller 114 is used to forcibly squeeze the tube 118 (suction is performed only by a so-called roller pump), the high negative pressure required to suction and remove excess ink or foreign matter in the nozzle is instantaneously generated. Difficult, because it takes a long time to obtain a high negative pressure, it consumes time or ink.

In contrast, Japanese Patent Publication No. 2801388 discloses a configuration in which a pressure roller 126 is provided between the pump 122 and the cover 124 ( FIG. 7 ). In this configuration, the pump 122 is driven in a state in which the tube 128 is blocked by the pressure roller 126 , whereby a high negative pressure can be retained in the tube 128 between the pressure roller 126 and the pump 122 . Therefore, by moving the pressure roller 126 to open the tube 128 in this state, a high suction force can be instantaneously acted on the inside of the cover 124 .

However, even if a high negative pressure occurs between the pressure roller 126 and the pump 122, if the internal volume between the pressure roller 126 and the cover 124 is large, a negative pressure will be generated between the pressure roller 126 and the pump 122. The negative pressure is also absorbed between the pressure roller 126 and the cover 124. Therefore, a high suction force cannot be applied to the inside of the cover 124 .

Contents of the invention

In consideration of the above facts, the present invention aims to apply high suction force instantaneously so that ink can be efficiently sucked from the ink discharge port of the inkjet recording head.

One aspect of the present invention is an ink suction device that sucks ink from an ink discharge port of an inkjet recording head that discharges ink droplets onto a recording medium based on image information, and includes: The cover member of the aforementioned inkjet recording head, the suction device that can suck the ink in the aforementioned cover member, the ink delivery member that connects the aforementioned cover member and the aforementioned suction unit so that it can deliver ink, is located on the aforementioned ink delivery member and opens An opening and closing member for closing the ink delivery member, and an inner volume increasing means for making the inner volume of the ink delivery member from the opening and closing member to the aforementioned suction means larger than the inner volume of the ink delivery member from the aforementioned cover member to the aforementioned opening and closing member .

Furthermore, in the present invention, the "ink" sucked from the ink discharge port includes, in addition to the remaining ink in the inkjet recording head (especially in the nozzle), foreign matter such as dust or dust present in this ink, or Air bubbles that occur within the ink.

When sucking ink from the ink discharge port of the ink jet recording head by this ink suction device, first, the cap member is brought into contact with the ink jet recording head so as to surround the ink discharge port. Then, the opening and closing member is brought into a closed state to close the ink transport member.

When the suction device is driven in this state, the part between the opening and closing member and the suction device is sucked among the ink delivery members, and a negative pressure is generated. Since the inner volume of the ink delivery member from the opening and closing member to the suction device is increased by the inner volume increasing device so as to be larger than the inner volume of the ink delivery member from the cover member to the opening and closing member, so in the process from the opening and closing member to the suction. Sufficient negative pressure can be maintained in the ink delivery member of the device. At this time, negative pressure due to the driving of the suction device does not occur in the ink delivery member between the cover member and the opening and closing member.

Next, the driving of the suction device is stopped, the opening and closing member is opened, and the ink transport member is opened. A large negative pressure remaining in the ink delivery member between the opening and closing member and the suction device acts momentarily on the inside of the cover member, and the ink can be sucked from the inkjet recording head with a large suction force momentarily.

Description of drawings

FIG. 1 is a perspective view showing a recording head carriage frame and its vicinity of an ink jet recording apparatus having an ink jet recording head recovery device equipped with an ink suction device according to an embodiment of the present invention. picture.

Fig. 2 is a partially cutaway perspective view showing an ink jet recording head recovery device according to an embodiment of the present invention.

3 is a plan view showing a schematic configuration of an ink jet recording head recovery device according to an embodiment of the present invention.

4 is an explanatory view showing a schematic configuration of an ink suction device constituting an inkjet recording head recovery device according to an embodiment of the present invention.

FIG. 5 is a timing chart showing each process of the ink suction process performed by the ink suction device according to the present invention in time series.

Fig. 6 is an explanatory diagram partially showing a conventional ink jet recording head recovery device.

Fig. 7 is an explanatory diagram partially showing a conventional ink jet recording head recovery device.

Detailed ways

In FIG. 1, an ink jet recording apparatus 12 equipped with a maintenance device 20 (ink jet recording head recovery device) according to an embodiment of the present invention is shown enlarged in the vicinity of a recording head holder 14 thereof. In addition, in FIGS. 2 and 3, the maintenance device 20, and in FIG. 4, the ink suction device 10 of the present invention constituting the maintenance device 20 are shown respectively.

This inkjet recording device 12 is equipped with a recording medium transfer member 16 for transferring a recording medium P (such as paper, etc.) in a certain direction, and a transfer path facing the recording medium P, and along the transfer path with the recording medium P. A group of guide members 18 arranged in a vertical direction. The recording head carriage 14 is supported by these guide members 18 . In addition, a maintenance device 20 is disposed below the guide member 18 and adjacent to the transport path of the recording medium P, and performs maintenance operations such as capping and ink suction on the recording head carriage 14 . This maintenance action is controlled by a control circuit (not shown) to be performed under prescribed conditions or timing.

The home position (initial position) of the recording head carriage 14 is set at the position facing the maintenance device 20, and this position is detected by the position sensor 22. The recording head carriage 14 , recording medium transfer member 16 , guide member 18 , maintenance device 20 and position sensor 22 described above are held in a main body case 24 . On the recording head carriage 14 , image information is transmitted via signal lines formed on a flexible substrate.

In addition, in the drawing, the moving direction of the recording head carriage 14 (main scanning direction) is indicated by an arrow M, and the moving direction of the recording medium P (sub scanning direction) is indicated by an arrow S, respectively.

The recording head carriage 14 is constituted by a carriage frame 26 provided so as to be movable along the guide member 18 , and a recording head unit 28 accommodated in a predetermined housing portion in the carriage frame 26 . The lower part of the inkjet recording head unit 28 is formed with a nozzle 33 inside, and the ink discharge port 37 of the ink discharge port 37 that discharges the ink in the nozzle 33 is formed on the ink discharge surface 35 ( Figure 4). Further, above the recording heads 32 , a sub-tank 30 for supplying ink to each of the recording heads 32 is arranged, and the sub-tank 30 and the recording heads 32 constitute the recording head unit 28 . The number of sub-ink tanks 30 corresponds to the number of recording head units 28, and is taken as four in this embodiment. Therefore, each sub-ink tank 30 supplies inks of different colors (for example, black (Bk), yellow (Y), red (M), blue (C)) to the recording head unit 28 and discharges ink droplets, whereby recording can be performed. Full color image. And the inkjet recording device 12 of the present embodiment transfers the recording medium P by the recording medium conveying member 16, and while the recording head carriage 14 is reciprocated, ink droplets are discharged according to the image information, and an image is recorded on the recording medium P ( figure 1).

Next, the maintenance device 20 has a housing 34 ( FIGS. 2 to 4 ) disposed below the home position. A motor 36 is arranged inside the casing 34 . Further, a swing arm 38 is pivotally supported on the side wall of the housing 34 so as to be able to swing around one end thereof. The rotational driving force of motor 36 acts on one end side of swing arm 38, and when motor 36 forward rotation, swing arm 38 swings along the arrow S direction of Fig. The tie 42 is engaged (two-dot dash line in FIG. 2 ). Accordingly, the rotational driving force of the motor 36 acts on the cam driving gear train 42 . This rotational driving force is then transmitted to a camshaft 44 provided with a plurality of cams (not shown). The cam of the camshaft 44 distributes each action to each angle in one turn of the camshaft 44, so that the cover seat 48, the valve 58, and the wiping piece holding plate 70 described later are lifted, opened and closed, and opened and closed at predetermined timings respectively. reciprocating movement. Furthermore, the rotation angle of the camshaft 44 is detected by a photoelectric sensor (not shown), and the control circuit controls the rotation amount (rotation angle) of the camshaft 44 based on this information.

On the contrary, if the motor 36 reverses, the swing arm 38 swings in the direction opposite to the arrow S, because the output gear 40 is meshed with the pump driving gear train 46 as shown by the solid line, so the rotational driving force of the motor 36 acts on Gear train 46 for pump drive.

Moreover, the rotation (forward and reverse) of the motor is controlled by a control circuit (not shown), so that the reciprocating action of the maintenance device 20 to the recording head unit 28 and the image recording action (emission of ink droplets or main scanning and sub- scanning) will not be performed at the same time.

A cover base 48 is provided on the upper portion of the housing 34 so as to be able to move up and down. According to the rotation angle of the camshaft 44, a lifting force acts from a cam (not shown) via a link mechanism (not shown). Four caps 50 corresponding to each of the recording heads 32 are arranged on this cap base 48 . These caps 50 are formed in a substantially cuboid shape with an open upper portion, and when the cap holder 48 rises when the recording head carriage 14 is at the home position, the corresponding recording heads 32 are closely attached to the ink so as to surround the ink discharge port 37. Discharge face 35 . This prevents unintentional drying of ink from the ink discharge port 37, mixing of foreign matter, etc., and maintains the state of the recording head unit 28 optimal for discharging ink droplets.

Among the four caps 50, a designated cap 50 (in this embodiment, the cap located on the upper left in FIG. 2) has its bottom connected to one end of a tube 52 to form an ink suction cap 50B (FIG. 4). The tube 52 is made of a flexible material having ink resistance, and is bent into a desired shape as a whole, and the flow of the fluid can be blocked by partially crushing to close the inside.

A valve 58 is provided in the middle of this one pipe 52 , and the other end is connected to the upper part of a negative pressure tank 60 arranged in the casing 34 . The valve 58 is opened and closed at predetermined timing by the rotation of the camshaft 44 via a cam and link mechanism (not shown). Thereby, the tube 52 is also brought into a state where the fluid can flow inside (tube connected state) or a state where the fluid cannot flow (tube blocked state) at a predetermined timing.

The negative pressure tank 60 is formed in a substantially cylindrical shape (cylindrical or square cylindrical in shape, but is cylindrical in this embodiment) and hollow inside. By providing such a negative pressure tank 60 with a cavity, the inner volume V2 of the ink delivery member 56 from the valve 58 to the pump 62 described later is larger than the inner volume V1 of the ink delivery member 56 from the cap 50B to the valve 58 . In other words, the negative pressure tank 60 is arranged at an appropriate position that satisfies the above-mentioned condition of the inner volume (V1<V2).

Inside the casing 34 is arranged a pump 62 driven by the rotational driving force from the pump driving gear train 46 . As can be seen from FIG. 4 , the pump 62 is a so-called roller pump, and one or a plurality of rollers (small rollers) 66 are rotatably mounted at predetermined positions around a rotating plate 64 .

In addition, in the case 34, the pipe 54 whose one end is connected to the lower part of the negative pressure tank 60 is arrange|positioned. The tube 54 is made of a flexible material having ink resistance similarly to the tube 52 , but is made thicker than the tube 52 in order to increase strength. An ink delivery member 56 according to the present invention is constituted by the tube 52 and the tube 54 .

The middle portion of the tube 54 extends over about half a circle and hangs around the outer circumference of the rotating plate 64 constituting the roller pump 62 , and the tube 54 is partially crushed by the roller 66 . Therefore, if the pump is driven and the rotating plate 64 rotates in the direction of the arrow R, the part crushed by the roller 66 gradually moves to the other end of the tube 54, and the fluid in the tube 52 moves to the other end side.

Furthermore, on the upper part of the housing 34, the wiping sheet holding plate 70 (FIG. 2) is arrange|positioned so that it can move along the shaft 68. As shown in FIG. Four wiper sheets 72 corresponding to the respective ink discharge surfaces 35 ( FIG. 4 ) of the recording head 32 are attached to the wiper sheet holding plate 70 . The wiper sheet holding plate 70 moves in the direction of arrow A at a predetermined timing (forward motion) by the rotation of the camshaft 44, and then moves in the direction opposite to the arrow A at a predetermined timing (backward motion). When the recording head carriage 14 is in the home position, the wiping sheet holding plate 70 reciprocates in this way, and the wiping sheet 72 wipes the ink discharge surface 35 of its corresponding recording head 32 respectively to remove foreign matter attached to the ink discharge surface 35. .

Next, actions of the inkjet recording apparatus 12 and the maintenance apparatus 20 of this embodiment will be described.

An image is recorded on the recording medium P by moving the recording medium P in the sub-scanning direction and the recording medium P in the main scanning direction while ejecting ink droplets from the recording head unit 28 according to the image information.

When the recording head unit 28 is in a predetermined state requiring maintenance, a control circuit (not shown) moves the recording head carriage 14 to the home position. Then, a control circuit (not shown) causes the motor 36 to rotate forward. Since the swing arm 38 swings in the direction of arrow S in FIG. 2 , the rotational drive force of the motor 36 rotates the cam shaft 44 via the cam drive gear train 42 . Thereby, first, the wiping sheet holding plate 70 reciprocates in the arrow A direction and its opposite direction. The ink discharge surface 35 of the recording head 32 is wiped by the wiping sheet, and foreign matter adhering to the ink discharge surface 35 is removed.

After the wiping action, if the camshaft 44 is further rotated by the forward rotation of the motor 36, the cover seat 48 rises, and the cover 50 contacts and sticks to the ink discharge surface 35 of the recording head 32 (contact process, FIG. 4 ). Thereby, since the surroundings of the nozzles 33 (ink discharge ports 37 ) of the recording head 32 are blocked, unintentional drying of ink from the recording head unit 28 and mixing of foreign matter can be prevented.

When the camshaft 44 is further rotated by the normal rotation of the motor 36, the valve 58 is in a closed state (closing process, FIG. 5). Thereby, the tube 52 is blocked in the middle, and fluid cannot flow inside.

With the tube 52 blocked in this way, the control circuit (not shown) reverses the motor 36 . The swing arm 38 swings in the direction opposite to the arrow S ( FIG. 2 ), and since the rotational drive force of the motor 36 is transmitted to the pump 62 via the pump drive gear train 46 , the pump 62 is driven (driving process). Thereby, since the fluid in the tube 54 is sent to the other end side of the tube 54, the inside of the tube 54 is gradually decompressed. Furthermore, at this time, the tube 52 is blocked by the valve 58 at its middle part, so only the part from the valve 58 to the negative pressure tank 60 is decompressed, in the ink suction cap 50B, and from the ink suction cap 50B. No negative pressure occurs in the pipe 52 to the valve 58 . That is to say, between the valve 58 and the negative pressure box 60 of the pipe 52, in the negative pressure box 60, and between one end of the pipe 54 and the initial contact position of the roller 66, it is driven by the pump 62 to depressurize. Decompression space.

At this time, in this embodiment, as can be seen from FIG. 4 , since the negative pressure box 60 is provided, the volume V2 of the decompression space is increased compared with the configuration without such a negative pressure box 60 . In addition, the volume V2 of the decompression space is also larger than the volume V1 of the space (non-decompression space) in the tube 52 from the ink suction cap 50B to the valve 58 . Therefore, through the driving of the pump 62, the space for generating negative pressure expands, and a sufficient negative pressure can be retained in the decompression space.

When the pump 62 is driven for a predetermined time and a certain negative pressure remains in the decompression space, the control circuit makes the motor 36 rotate forward again. Thereby, since the swing arm 38 swings in the direction of the arrow S in FIG. 2 , the drive of the pump 62 is stopped. Next, the camshaft 44 rotates, and as can be seen from FIG. 5 , the valve 58 is in an open state (opening process). Thereby, since the negative pressure generated in the decompression space acts instantaneously on the inside of the ink suction cap 50B, ink can be sucked from the inside of the recording head unit 28 (in particular, the inside of the nozzle 33 ) with a large suction force. The sucked ink is discharged as waste ink to an ink discharge tank (not shown) provided at the other end side of the tube 54 .

Finally, when the motor 36 is further rotated forward, the cap holder 48 is lowered, so that the cap 50 is separated from the recording head unit 28 . Of course, in order to constantly prevent drying of ink from the recording head unit 28 or contamination of foreign matter, the cap holder 48 may not be lowered, but the cap 50 may be kept in close contact with the recording head unit 28 .

In addition, in this embodiment, ink can be sucked only from the recording head unit 28 corresponding to the designated ink suction cap 50B among the plurality of caps 50 . Therefore, the recording head carriage 14 is moved by a predetermined amount along the arrangement direction of the caps 50 (main scanning direction), so that the recording head unit 28 that will suck ink is located above the cap 50B for ink suction, whereby all the recording head units can be 28 to attract ink. Of course, all the caps 50 may be used as ink suction caps 50B, and ink can be sucked from all the recording head units 28 without moving the recording head carriage 14 .

As described above, in the ink suction device 10 (maintenance device 20) of this embodiment, since the internal volume V2 in the tubes 52, 54 (decompression space) from the valve 58 to the pump 62 is larger than the cap 50 (cap for ink suction), 50B) and the inner volume V1 in the pipe 52 from the cover 50 to the valve 58, so a large negative pressure is generated in the decompression space, and by making the valve 58 open, this negative pressure can be instantly acted on Cover 50 inside. Therefore, ink can be sucked from the inside of the recording head unit 28 (in particular, the inside of the nozzles 33) with a large suction force. Since the suction of the ink is completed in a short time and the ink is not sucked too much, it can be sucked efficiently.

The configuration for increasing the internal volume of the ink delivery member 56 (pipes 52, 54) from the valve 58 to the pump 62 (that is, the internal volume increasing device of the present invention) is not limited to the above-mentioned negative pressure tank. 60. In short, it only needs to have a sufficiently large internal volume to increase the internal volume of the decompression space and have strength that does not deform or be damaged even when decompression is performed. Thereby, also can for example make a part or whole of pipe 54 large-diameter, and wall thickness also thickens so that obtain required strength, but because the elasticity of pipe 54 also improves thereby, so produced more powerfully to press pump 62. The roller 66 is necessary. In addition, since the rigidity of the tube 54 is also increased, there may be restrictions on the wiring and assembly work in the case 34 . On the contrary, if the negative pressure box 60 is provided like this embodiment, since it is not necessary to make the pipe 54 itself play the role of the inner volume increasing device, the roller 66 of the pump 62 can be adjusted by setting the elasticity and rigidity appropriately. A small pressing force is sufficient, and the degree of freedom of wiring in the casing 34 and the ease of assembly can be improved, making it possible to reduce the size of the ink suction device 10 .

In addition, the material of the tube 52 is not particularly limited as long as it has ink resistance as described above, but if it is composed of a flexible material like this embodiment, since the restrictions on the wiring in the housing 34 are reduced, Therefore, the size of the ink suction device 10 can be reduced, and the assembly workability can be improved. In addition, at least the part that is opened and closed (compressed) by the valve 58, if compared with other parts of the ink delivery member 56, is made with low elasticity, the tube 52 (the ink delivery member 56) can be blocked with a small force, So best. In this embodiment, the tube 52 is made to be less elastic than the tube 54, thereby substantially making the entire portion of the ink delivery member 56 from the cover 50 to the negative pressure tank 60 smaller than other parts of the ink delivery member 56. The tube 54 is less elastic, and the ink delivery member 56 can be blocked with less force. Of course, it is also possible to make only the part of the tube 52 compressed by the valve 58 thin-walled or the like, thereby making it low in elasticity. A specific method of making the tube 52 low in elasticity includes making the tube 52 small in diameter and thin in wall, but it is not limited thereto. For example, the elasticity can be reduced by selecting an appropriate material.

On the contrary, it is preferable that at least a portion of the ink delivery member 56 from the negative pressure tank 60 to the pump 62 has higher strength than the portion from the cover 50 to the negative pressure tank 60 . That is, as described above, although in this embodiment, since the negative pressure remains in the negative pressure tank 60, the negative pressure acting on the ink delivery member 56 is small compared with the configuration in which the negative pressure tank 60 is not provided, but in The negative pressure is relatively increased at the portion from the negative pressure tank 60 to the pump 62 . Therefore, in this embodiment, the pipe 54 is made thicker than the pipe 52 to increase the strength, thereby eliminating deformation of the ink delivery member 56 due to negative pressure, and the like.

Although the position where the tubes 52, 54 are connected to the negative pressure tank 60 is not particularly limited, if the connection position of the tube 52 is set at a position relatively above the connection position of the tube 54 like this embodiment, the ink will be sucked when the ink is sucked. The flow becomes not in the direction opposite to gravity, so it is best. In particular, if the connection position of the tube 54 is taken as the bottom of the negative pressure tank 60, the ink can be completely discharged without remaining in the negative pressure tank 60, so it is preferable.

The ink suction device of the present invention is not limited to a rotary pump such as a roller pump such as the pump 62 of the present embodiment, and any ink suction device having the suction capability required for the suction device of the present invention may be used. Therefore, for example, a pump that obtains suction by reciprocating motion of a plunger may also be used. If a roller pump is used as in this embodiment, components such as a plunger and a cylinder are unnecessary, and a moving space for the plunger is also unnecessary, so that the suction device can be miniaturized. In addition, since the rotational motion of the motor 36 can be used to drive the pump without converting it into another motion, the efficiency is high, and the amount of suction can be finely adjusted by the rotation angle of the rotary plate 64, so it is preferable.

In particular, although in the case of using pigment-based ink, there is a danger that the pigment components in the ink, etc. may be solidified in the cylinder, but since there is no cylinder in the rotary pump of this embodiment, it does not occur. This kind of pigment composition is solidified and other problems.

As the ink suction device 10 of the present invention, it is not necessary to necessarily incorporate the maintenance device 20 (ink jet recording head recovery device), and it may also be separately installed in the ink jet recording device 12 from the maintenance device 20, and the ink suction device 10 may also be It can be composed of a single body (that is, no other devices are installed). In addition, the ink suction method of the present invention does not necessarily need to be performed as part of the maintenance operation, and it can be used as long as ink is sucked from the inkjet recording head (recording head unit 28).

The maintenance operation performed by the maintenance device 20 equipped with the ink suction device 10 is not limited to the above-mentioned ones, either. For example, a so-called dummy ejection for eliminating clogging of the nozzles 33 may be performed together with the recording head unit 28 (coordinated operation).

In the present invention, since it is an ink suction device that sucks ink from an ink discharge port of an inkjet recording head that discharges ink droplets onto a recording medium based on image information, it includes: The cover member of the ink recording head, the suction device capable of sucking the ink in the aforementioned cover member, the ink delivery member that connects the aforementioned cover member and the aforementioned suction unit so that it can deliver the ink, is arranged on the aforementioned ink delivery member and opens and closes the ink The opening and closing member of the conveying member, and the inner volume increasing device that makes the inner volume of the ink conveying member from the opening and closing member to the aforementioned suction device larger than the inner volume of the aforementioned ink conveying member from the aforementioned cover member to the aforementioned opening and closing member, so A high attractive force is applied instantaneously so that the ink can be efficiently sucked from the ink discharge port of the inkjet recording head.

Claims (11)

1. An ink suction device, which is an ink suction device that sucks ink from an ink discharge port of an ink jet recording head that ink droplets are discharged onto a recording medium based on image information, and is characterized in that it includes: a cover member in contact with the inkjet recording head so as to surround the ink discharge port, A suction device capable of sucking ink in the aforementioned cover member, an ink delivery member that connects the aforementioned cover member to the aforementioned suction means to enable it to deliver ink, an opening and closing member provided on the aforementioned ink delivery member and opening and closing the ink delivery member, and Internal volume increasing means for making the inner volume of the ink delivery member from the opening and closing member to the suction means larger than the inner volume of the ink delivery member from the lid member to the opening and closing member. 2. The ink suction device according to claim 1, wherein said internal volume increasing means is a negative pressure tank member provided on said ink delivery means from said opening and closing member to said suction means. 3. The ink suction device according to claim 1 or 2, wherein at least a part of said ink delivery member is a flexible tube. 4. The ink suction device according to any one of claims 1 to 3, wherein, among the ink delivery members, at least the part opened and closed by the opening and closing member is made to be less elastic than other parts. . 5. The ink suction device according to any one of claims 1 to 4, wherein at least a part of the part of the ink delivery member from the opening and closing member to the suction device is made thinner than other parts. high strength. 6. The ink suction device according to any one of claims 1 to 5, wherein said suction device is a rotary pump. 7. The ink suction device according to any one of claims 1 to 6, wherein On the aforementioned negative pressure box member, an ink inlet connected from the aforementioned cover member to the aforementioned ink delivery member of the negative pressure box member, and an ink outlet connected from the negative pressure box member to the ink delivery member of the suction device, The aforementioned ink outlet is arranged below the aforementioned ink inlet. 8. The ink suction device according to claim 7, wherein said ink outlet is provided at the bottom of said negative pressure box member. 9. An ink jet recording head recovery apparatus, characterized by being provided with the ink suction means according to any one of claims 1 to 8. 10. An inkjet recording device, characterized in that it is equipped with: an inkjet recording head that discharges ink droplets onto a recording medium based on image information for image recording, and An ink jet recording head recovery device according to claim 9 . 11. An ink suction method, which is an ink suction method for sucking ink from an ink discharge port of an inkjet recording head by the ink suction device according to any one of claims 1 to 8, comprising: In the process of making the cover member contact the inkjet recording head so as to surround the ink discharge port, A closing process in which the ink delivery member is closed by the opening and closing member, a driving process for driving the aforementioned attraction means, and After the drive of the suction device is stopped, the opening and closing member is brought into an open state, and the opening process of the ink delivery member is opened.

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