JP2001232808A - Ink jet recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recorder in which print quality can be sustained well by preventing swinging of a pressure damper. SOLUTION: A recording head 4 is fixed to the lower surface of the fixing base 2b of a carriage 2 and a pressure damper 6 for suppressing pressure variation of ink is fixed to the lower surface thereof. Piping 7 is connected to an ink inlet 62 and ink is supplied, while suppressing pressure variation, to the head 4 side through a needle part 80 inserted into a needle connecting part 63. When the pressure damper 6 is fixed, a stop screw 10 is driven into a stop boss 21 while aligning the cavity 21a of the stop boss 21 with the stop opening 69a of the stop part 69.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus for recording images, characters, etc. on recording paper by an ink jet recording head mounted on a carriage.
In particular, the present invention relates to an ink jet recording apparatus in which an ink tank is arranged on a printer main body side and ink is supplied from the ink tank to a recording head via an ink supply tube.

[0002]

2. Description of the Related Art As a recording apparatus, an ink jet printer is already well known. That is, the inkjet printer is configured to record print data such as images and characters by ejecting ink droplets on a print medium such as recording paper, and includes an inkjet recording head that ejects ink droplets from nozzle openings. . This ink jet recording head moves, for example, in the width direction of recording paper (main scanning).
Provided on a possible carriage.

In an ink-jet printer capable of recording on a large-size recording paper such as A0 size, a large amount of ink needs to be stored because of a large amount of ink consumption. In such a printer, if a configuration is adopted in which an ink cartridge storing ink is mounted on a carriage, it is necessary to use a large-capacity ink cartridge. This allows
There is a problem that the carriage with the ink cartridge mounted thereon becomes excessively heavy, a large output is required for the drive motor of the carriage, and a large inertia moment causes a large reaction when the carriage is inverted.
In addition, an ink jet printer using multicolor inks such as six colors requires an ink cartridge that stores inks of each color. When an ink cartridge having a sufficient amount of stored ink for each color is mounted on the carriage, the carriage becomes excessively heavy.

Under such circumstances, there has been proposed an ink jet printer in which an ink tank is separated from a carriage and arranged on a printer main body (housing) side, and ink is supplied from the ink tank to a recording head via an ink supply tube. Have been. This configuration of the printer
There is an advantage that the weight of the carriage can be reduced even if a large amount of ink is stored. However, in this printer, the pressure in the ink in the ink supply tube fluctuates due to the acceleration and deceleration of the carriage. Then, such a fluctuation in the pressure of the ink makes the ejection of the ink droplet unstable. Therefore, a pressure damper is attached to the carriage to suppress the ink pressure fluctuation, and the pressure damper is configured to suppress the ink pressure fluctuation.

The above-described pressure damper includes, for example, an ink chamber in which an opening of a concave chamber is sealed with an elastic sheet, and a needle connecting part communicating with the ink chamber. It is attached to the carriage by inserting it into the supply needle. In this mounted state, the pressure damper is supported on the carriage by the O-ring of the needle connection. The pressure damper absorbs and reduces the pressure fluctuation of the ink supplied through the ink supply tube by compliance due to the deformation of the elastic sheet. Then, the ink in which the pressure fluctuation has been suppressed is supplied to the recording head through the ink supply needle connected to the needle connection portion.

[0006]

In recent printing apparatuses, the carriage is moved at a high speed in order to improve the printing speed. Accordingly, the acceleration / deceleration of the carriage tends to increase, and the reaction force at the time of carriage reversal tends to increase. However, in the conventional ink jet recording apparatus, since the pressure damper is simply connected to the carriage via the O-ring, when the acceleration / deceleration of the carriage is increased, the O-ring portion is supported by the movement of the carriage. As a result, the pressure damper moves to the swinging state, and there is a possibility that ink ejection failure may occur. Also,
Since the connection portion of the pressure damper moves, there is a possibility that the sealing property of the connection may be deteriorated.

Therefore, it is conceivable to adopt a configuration in which the pressure damper is integrated with the carriage. However, the material of the pressure damper is limited in consideration of the weldability to a thin resin film for absorbing the pressure fluctuation of the ink, and a material satisfying the weldability with the resin film has poor dimensional accuracy. On the other hand, since the filter unit provided between the pressure damper and the carriage requires high dimensional accuracy, it is difficult to mold the pressure damper and the filter unit from the same material. For the above reasons, it is also difficult to integrate the pressure damper and the carriage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ink jet recording apparatus capable of preventing a pressure damper from swaying during movement of a carriage and maintaining good print quality. What you want to do.

[0009]

According to a first aspect of the present invention, there is provided a carriage having a mounting base portion provided with an ink supply needle and a recording head, and a printer body. An ink supply tube for supplying ink in the ink tank installed on the side, an ink chamber in which ink from the ink supply tube is stored, and a pressure damper having a needle connection portion communicating with the ink chamber,
The ink chamber suppresses the pressure fluctuation of the ink that occurs when the carriage is moved in the main scanning direction, and supplies the ink with the reduced pressure fluctuation to the recording head through the ink supply needle connected to the needle connection unit. In the ink jet recording apparatus thus configured, the pressure damper is provided with a fastening portion having a fastening opening penetrating in a thickness direction, and a shaft portion of a fastening member can be fixed to a mounting base portion of the carriage. When the shaft of the fastening member is inserted into the fastening opening, the fastening portion is restrained to the seat side by the fastening member, and the fastening portion is narrowed by the fastening member and the seat. An ink jet recording apparatus characterized in that the pressure damper is rigidly fixed to the carriage by holding the pressure damper.

According to a second aspect of the present invention, the fastening member is formed by a male screw, and a shaft portion of the male screw is screwed into a receiving seat, so that the fastening portion is connected to the receiving side by the head of the male screw. 2. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is configured to be pressed.

According to a third aspect of the present invention, the carriage has an anti-rotation portion that contacts the pressure damper to prevent the pressure damper from rotating together during mounting. It is an ink jet type recording device as described in the above.

Further, according to a fourth aspect of the present invention, inside the needle connection portion, an outer periphery of a base end opening is liquid-tightly joined to a pressure damper side, and an inner periphery of a front end opening is an ink supply needle. A seal member formed of an elastic cylindrical member capable of contacting in a liquid-tight manner on the outer peripheral surface of the seal member. 4. An ink jet recording apparatus according to claim 1, wherein the opening area of the portion is smaller than the opening area of the base end opening.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the ink jet recording apparatus of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 5 show an ink jet printer which is a typical ink jet recording apparatus. FIG. 1 is a plan view of the ink jet printer, FIGS. FIG. 5 is a front view of the pressure damper, and FIG.
It is sectional drawing cut | disconnected by the Z surface.

As shown in FIG. 1, the printer 1 has a carriage 2 movably mounted on a guide member (not shown). The carriage 2 has a timing belt 14 stretched between a driving pulley 12 and an idle pulley 13.
The recording paper 3 is moved (main scanning) in the width direction of the recording paper 3 by driving of the driving motor 15.

As shown in FIG. 2, a recording head 4 is provided on the lower surface of the mounting base 2a of the carriage 2 (that is, the surface facing the recording paper 3). The recording head 4 discharges the supplied ink as small ink droplets. As shown in FIG. 5, the recording head 4 of the present embodiment includes a box-shaped case 40 and the case 4.
0, and the piezoelectric vibrator 41 housed in the housing
Flow path unit 45 joined to the lower surface (tip surface)
An ink supply pipe 44 for supplying ink to a pressure chamber (not shown) of the flow path unit 45 and a nozzle row in which a plurality of nozzle openings 43 are arranged in the sub-scanning direction are separated in the main scanning direction into two parallel rows. And a nozzle plate 42 formed at the bottom.
In the recording head 4, an ink droplet is ejected from the nozzle opening 43 by expanding and contracting the pressure chamber by the piezoelectric vibrator 41.

On the other hand, on the upper surface of the mounting base 2a opposite to the surface on which the recording head 4 is provided, a carriage 2 is provided.
The pressure damper 6 for suppressing the fluctuation of the ink pressure due to the main scanning is attached. This pressure damper 6
Two nozzles are provided corresponding to each of the two nozzle rows. Each of the pressure dampers 6, 6 is arranged a little apart in the main scanning direction and is attached in the same direction. The carriage 2 and the pressure damper 6 will be described later in detail.

A cleaning section 17 for cleaning the recording head 4 and a capping section 18 for capping are provided side by side outside the printing area in the moving range of the carriage 2. The cleaning unit 17 is configured so that a wiper blade can be pressed against the nozzle plate 42 of the recording head 4 and the surface of the nozzle plate 42 can be wiped by the wiper blade. The capping section 18 is provided with a tray-like cap member having a concave chamber with an open upper surface. The cap member appropriately seals the nozzle plate 42, and prevents evaporation of the ink solvent from the nozzle opening during non-recording. To prevent it. Further, the concave chamber of the cap member is communicated with a suction tube, and ink is forcibly sucked from the recording head 4 to the cap member side by a suction pump arranged in the middle of the suction tube.

Further, an ink tank 5 is provided further outside the capping section 18 (right side in FIG. 1) in the printer body. The ink tank 5 stores ink used in the printer 1. In the present embodiment, two ink tanks 5 are provided corresponding to each of the two nozzle rows.

The ink tank 5 and the pressure damper 6
Are communicated with each other by an ink supply tube 7 having elasticity. The ink supply tube 7 is formed of an elastic material such as silicone rubber. In addition, the ink supply tube 7 may have a double structure in which an inner layer made of an elastic member such as a silicone resin having excellent chemical resistance is covered with an outer layer of vinyl chloride, a metal film, or the like having excellent airtightness as an outer layer. . The ink stored in the ink tank 5 is supplied to the pressure damper 6 through the ink supply tube 7. Then, the ink is supplied to the recording head 4 in a state where the pressure fluctuation is absorbed in the pressure damper 6.

In the printer 1 having the above configuration, the carriage 2
While moving in the main scanning direction, ink droplets are ejected from the nozzle openings 43 of the recording head 4, and the platen 16 is rotated in conjunction with the main scanning of the carriage 2 to move the recording paper 3 in the vertical direction (sub-scan). Thus, print data such as images and characters is recorded on the recording paper 3.

Next, the carriage 2 will be described in detail.

The carriage 2 is formed of a resin material. Then, as shown in FIGS. 2 and 3, the carriage 2 includes a mounting base 2a formed as a substantially rectangular plate-like portion having a slightly longer sub-scanning direction (Y direction in the drawing). A fixing boss 21 for fixing the pressure damper 6 is provided substantially at the center in the longitudinal direction on the upper surface of the mounting base 2a.
Project upward. The fastening boss 21 is formed with an empty space 21 into which the fastening screw 10 can be screwed downward from substantially the center of the front end surface.
This is a substantially cylindrical member formed with a, and functions as a seat in the present invention. The two fixing bosses 21 are formed in the main scanning direction so as to correspond to the respective pressure dampers 6 and 6.

A filter mounting recess 24 for mounting the ink supply needle 8 and the filter 84 is formed near the fixing boss 21 on the side of the fixing boss 21 in the sub-scanning direction. As shown in FIG.
A ring-shaped (annular) base portion 81 and a flange portion 82 of the ink supply needle 8 and a filter 84 located below the base portion 81 have a circular opening with an open upper surface where the filter 84 just fits, and is contracted downward. It is constituted by a hollow space. The two filter mounting recesses 24 are also formed in the main scanning direction (X direction in the figure) so as to correspond to each of the pressure dampers 6 and 6.

At one end of the mounting base 2a in the sub-scanning direction, a block-like projection 22 is provided so as to project upward. The protrusion 22 is provided in the fitting groove 66 a of the pressure damper 6.
(To be described later) is a part to be fitted, and is a kind of a rotation preventing portion in the present invention. Similarly, at the other end of the mounting base 2a in the sub-scanning direction, a contact plate 23 is provided to protrude upward. The abutment plate 23 is a part that the pressure damper 6 comes into contact with when the pressure damper 6 is attached, and is a kind of a rotation prevention part in the present invention. In the present embodiment, a part of the upper end of the backing plate 23 is extended upward to form a contact portion.

As shown in FIG. 5, a flow path forming portion 20 is provided on the lower surface of the mounting base 2a so as to project downward. Inside the flow path forming portion 20, a base end is provided with a filter mounting concave portion 24.
Inside, an ink flow path 20a whose leading end communicates with the ink supply pipe 44 is provided. Therefore, the filter mounting recess 24 and the ink supply pipe 44 communicate with each other through the ink flow path 20a. The recording head 4 is joined to the front end surface of the flow path forming section 20.

The ink supply needle 8 is formed of a resin material having high dimensional accuracy. As shown in FIG. 5, a ring-shaped base 81 and an outer peripheral surface of the base 81 are formed from the upper side to the outer side. The extended flange portion 82 and the base portion 8
A diameter-reduced portion 83 that is formed continuously from the upper end of the upper portion 1 and gradually decreases in diameter upwardly, and is formed continuously and upward from the upper end of the diameter-reduced portion 83 to connect the internal space and the outside. And a cylindrical needle portion 80 having a conical top with a communicating hole formed therein. A disc-shaped filter 84 is fitted under the base 81 in the filter mounting recess 24 so as to trap bubbles, dust, and the like from flowing ink.

Next, the pressure damper 6 will be described in detail.

This pressure damper 6, as shown in FIG.
An oval base 61 slightly longer in the lateral direction as viewed from the front,
A resin material having good weldability to the resin film forming the elastic sheet 64 is provided with an extension portion 66 which extends laterally (rightward in FIG. 4) at one lower end of the base portion 61. , Molded from polypropylene.

A concave chamber serving as an ink chamber 60 is formed in the base 61 so as to be depressed in the rear direction. A cylindrical needle connection portion 63 is provided on the lower surface of the base 61 so as to project downward. On the other hand, the ink inlet 62 protrudes upward from the upper surface of the extension portion 66. The tip of the ink supply tube 7 is connected to the ink inlet 62. Therefore, the ink supplied through the ink supply tube 7 flows into the pressure damper 6 through the ink inlet 62. Further, a fitting groove 6 that fits into the protrusion 22 is provided at the tip of the extension 66.
6a is formed. The fitting groove 66a is formed in a substantially concave shape having a distal end open when viewed from above, and is formed by separating a pair of protrusions to a width in which the protrusion 22 just fits.

The ink chamber 60 and the ink inlet 62
The ink channel 62a communicates with the ink channel 62a through a connection groove 67, and the ink chamber 60 communicates with the internal space 63a of the needle connection portion 63 through a connection channel 68. A filter 65 (see FIG. 5) is attached to the ink chamber side opening of the connection flow channel 68 so as to trap dust and the like from flowing ink.

The edge 61a of the base 61 and the edge 6 of the extension 66 are covered so as to cover the base 61 and the extension 66.
6b, a transparent elastic sheet 64 is attached, and the ink chamber 60
The opening on the front side and the opening of the connection groove 67 are sealed with the elastic sheet 64. Therefore, in this pressure damper 6,
From the ink inlet 62 (ink channel 62a) to the connection groove 6
7, ink chamber 60, connection channel 68, and needle connection portion 63
A series of ink passages constituted by the (internal space 63a) are formed. The elastic sheet 64 that partitions a part of the ink chamber 60 functions as an elastic partition in the present invention. As shown in FIG. 5, the elastic sheet 64 can be deformed in a direction in which the ink chamber 60 contracts and in a direction in which the ink chamber 60 expands. Absorbed.

The pressure damper 6 on the side opposite to the elastic sheet 64
As shown in FIG. 2, a fastening portion 69 is provided on the back surface side. The fastening portion 69 is a plate-shaped member that is substantially parallel to the lower edge of the base 61 and extends rearward. The fastening portion 69 has a thickness direction (vertical direction) of the fastening portion 69.
A fastening opening 69a penetrating through is formed. The diameter of the fastening opening 69a is larger than the diameter of the shaft of the fastening screw 10 (a kind of fastening member of the present invention) configured as a male screw (specifically, a tapping screw also referred to as a self-tapping screw). It is set smaller than the diameter of the head of the set screw 10. The length from the lower flat surface (mounting surface) of the fastening portion 69 to the tip of the needle connecting portion 63 is equal to the length of the fastening boss 2.
The height is set to be the same as the height of 1 (the length from the base end to the distal end face) or slightly shorter than this height. This is to prevent the needle connection portion 63 from being pressed against the flange portion 82 of the ink supply needle 8 with an excessively strong force when the pressure damper 6 is attached. Further, a pair of reinforcing ribs 69b, 6 extending in the vertical direction intersecting with the direction in which the fastening portion 69 is formed are provided at both ends in the left-right direction of the fastening portion 69.
9b are integrally formed. This reinforcing rib 69b is
It is a reinforcing member that prevents the fastening portion 69 from bending in the vertical direction.

As shown in FIGS. 4 and 5, the needle connecting portion 63 is a cylindrical portion whose upper end is closed and whose lower end is open. This needle connection part 63
In the ceiling surface of the internal space 63a, an end of the connection flow path 68 is opened, and the ink chamber 60 and the internal space 63a are communicated through the connection flow path 68. The inner diameter of the needle connection portion 63 is sufficiently larger than the diameter of the needle portion 80, and is set, for example, to about 3 to 4 times the diameter of the needle portion 80. Further, the height of the internal space 63a of the needle connection portion 63 is set such that the needle portion 80 can be sufficiently stored.

The seal member 9 is fitted in the internal space 63a of the needle connection portion 63. As shown in FIG. 5, the seal member 9 includes a large-diameter annular portion 90 (corresponding to a base opening in the present invention) and a small-diameter annular portion 91 formed concentrically with the annular portion 90 (the present application). This is an elastic cylindrical member having an elastic side wall portion 92 connecting these annular portions 90 and 91, and is formed of, for example, butyl rubber. The outer diameter of the large-diameter annular portion 90 is equal to or slightly larger than the inner diameter of the internal space 63a, and the inner diameter is set to be larger than the diameter of the needle portion 80. Further, on the outer peripheral surface of the annular portion 90, a ridge for ensuring liquid tightness with the needle connecting portion 63 is formed over the entire circumference. On the other hand, the inner diameter (that is, the opening area) of the small-diameter annular portion 91 is set smaller than the inner diameter (that is, the opening area) of the large-diameter annular portion 90.
It is set slightly smaller than the diameter of the needle part 80. This is to ensure liquid tightness with the needle portion 80.

In the seal member 9 having such a configuration, the outer periphery of the large-diameter annular portion 90 is liquid-tightly attached to the inner wall surface of the needle connection portion 63 near the distal end opening of the needle connection portion 63 (that is, the pressure damper 6). Are joined. Further, the small-diameter annular portion 91 is located on the inner side of the internal space 63a than the large-diameter annular portion 90.

Next, the mounting of the pressure damper 6 on the carriage 2 will be described.

When attaching the pressure damper 6 to the carriage 2, first, the needle connection portion 63 is put over the needle portion 80, and is lightly pushed into the carriage 2. Thereby, the tip of the needle portion 80 is inserted into the opening of the small-diameter annular portion 91 of the seal member 9. If the needle portion 80 is inserted into the small-diameter annular portion 91, the fitting groove 66a of the pressure damper 6 is
The pressure damper 6 is further pushed into the carriage 2 while the end of the pressure damper 6 opposite to the fitting groove 66a is placed on the backing plate 23.
As a result, the fitting groove 66 a and the projection 22 are fitted to each other, and the lower surface of the fastening portion 69 is placed on the distal end surface of the fastening boss 21.

As shown in FIG. 5, the distal end of the needle portion 80 protrudes farther than the small-diameter annular portion 91, and the inner periphery of the annular portion 91 is liquid-tight with the outer peripheral surface of the needle portion 80. Contact. In this state, the small-diameter annular portion 91 can move independently of the large-diameter annular portion 90 due to the elasticity of the side wall portion 92. For this reason, even if the pressure damper 6 is slightly moved, the sealing property of the sealing member 9 can be maintained satisfactorily.

When the pressure damper 6 is further pushed in, the opening 21 a of the fastening boss 21 and the fastening opening 6 of the fastening portion 69 are formed.
9a and the shaft of the fastening screw 10 is inserted into the fastening opening 69a, and the fastening screw 10 is tightened. Here, since the fastening screw 10 of the present embodiment is a tapping screw, a female screw is formed on the inner wall peripheral surface of the cavity 21a as the fastening screw 10 is tightened. Then, by tightening the fastening screw 10, the head of the fastening screw 10 is attached to the fastening portion 6.
9 contacts the upper flat surface (pressing surface). When the fastening screw 10 is further tightened in this contact state, a rotational force in the screw tightening direction (for example, clockwise) is applied to the pressure damper 6. In the present embodiment, the rotational force of the pressure damper 6 is 2
2 and the contact plate 23. That is, on one side of the pressure damper 6, the fitting groove 66a is fitted with the projection 22, and on the other side, the contact plate 23 is provided in the direction in which the rotational force acts, and the pressure damper 6 is attached to the contact plate 23.
Is pressed against the contact part. For this reason, even if the fastening screw 10 is tightened, co-rotation of the pressure damper 6 can be prevented. Thereby, it is possible to reliably prevent a poor seal between the needle connecting portion 63 and the needle portion 80 when the pressure damper 6 is attached. The fitting groove 66a and the projection 22
If the clearance between them is large, etc.,
Even if the pressure damper 6 is slightly rotated at the time of attachment, the liquid tightness between the needle connecting portion 63 and the needle portion 80 can be ensured by the seal member 9 described above.

When the fastening screw 10 is sufficiently tightened, the head of the fastening screw 10 presses the upper flat surface of the fastening portion 69 toward the fastening boss 21. As a result, the fastening portion 69 is held between the fastening screw 10 and the fastening boss 21, and the pressure damper 6 is rigidly fixed to the carriage 2 by being rigidly attached to the carriage 2.
In this fixed state, the swinging of the pressure damper 6 during the operation of the carriage 2 can be reliably prevented, and the sealing property between the needle connecting portion 63 and the needle portion 80 can be kept high. Further, since the pressure damper 6 is rigidly attached to the carriage 2 by clamping the fixing portion 69 between the fixing screw 10 and the fixing boss 21, the needle connecting portion 63 and the needle portion 80 are provided. Unnecessary force is unlikely to be applied to the connection part with. Also in this regard, the sealing property between the needle connecting portion 63 and the needle portion 80 can be kept high. As a result, even if the pressure damper 6 and the carriage 2 are configured as separate members, the operation of suppressing the pressure fluctuation by the pressure damper 6 can be maintained, and the print quality can be maintained satisfactorily.

Further, since the pressure damper 6 is configured to be attached by the fastening screw 10, the pressure damper 6 can be fixed to the carriage 2 by a simple operation of tightening the fastening screw 10. Thereby, the work efficiency in the assembly work can be improved, and the printer 1 can be manufactured efficiently. Further, the work load of the assembler can be reduced. Further, the pressure damper 6 once attached can be removed from the carriage 2. For this reason,
If any defect is found in the recording head 4 after assembly, the pressure damper 6 is removed and another recording head 4 is removed.
It is possible to replace it. Thereby, it is possible to prevent the normal pressure damper 6 from being wastefully discarded, and it is possible to reduce the cost of parts.

If one pressure damper 6 is attached, the other pressure damper 6 is attached in the same procedure as above, and if the last pressure damper 6 is attached,
The carriage 2 is assembled to the printer body (housing side), and then the ink supply tube 7 is connected to the ink inlet 62.
Connect to

Note that various additions and changes can be made within the scope of the present invention. For example, the fastening screw 10
Instead, a metal wedge member is used as the fastening member, and the tip end portion (that is, the shaft portion in the present invention) is the fastening opening 69.
In this state, the wedge member may be driven into the space 21a formed below the distal end surface of the fastening boss 21 in the state of being inserted into the fixing boss 21, and the pressure damper 6 may be rigidly fixed to the carriage 2. In addition, instead of the fastening boss 21, a fastening base having a fixed shaft protruding from the distal end surface is provided, and the fixed shaft is deformed by heat with the fixed shaft inserted into the fastening opening 69a. Thus, the fastening portion 69 may be suppressed to the fastening base side, and the pressure damper 6 may be rigidly fixed to the carriage 2.

In the embodiment described above, the carriage 2 to which two pressure dampers 6 are attached is exemplified. However, the number of the pressure dampers 6 is not limited to this, and the printer 1 capable of recording four colors or six colors is used. Four, six, etc. can be provided as appropriate.

[0046]

As described above, the ink jet recording apparatus of the present invention has the following excellent effects. That is, the fastening portion is pressed toward the seat by the fastening member in a state where the shaft portion of the fastening member is inserted into the fastening opening, and the fastening portion is sandwiched between the fastening member and the seat. Since the pressure damper is rigidly fixed to the carriage, the pressure damper can be reliably prevented from swinging even if the carriage is rapidly accelerated or decelerated, and the sealing property between the ink supply needle and the needle connection part is improved. Can be kept high. As a result, the effect of suppressing the ink pressure by the pressure damper can be favorably maintained, and a decrease in print quality can be prevented. Further, since the pressure damper is rigidly fixed to the carriage by clamping the fixing portion between the fixing member and the seat, unnecessary portions are not required at the connection portion between the ink supply needle and the needle connection portion. It is hard to add power. Also in this regard, the sealing property between the ink supply needle and the needle connection part can be kept high.

Further, the fastening member is constituted by a male screw,
When the shaft of the male screw is screwed into the seat to press the fastening part toward the seat with the head of the male screw, the pressure damper can be moved to the carriage by a simple operation of tightening the male screw. Can be fixed. As a result, the work efficiency in the assembling work can be improved, the recording device can be manufactured efficiently, and the work load of the assembling worker can be reduced. Further, by removing the male screw, it is possible to remove the once mounted pressure damper from the carriage. Therefore, if any defect is found in the recording head after assembly, the pressure damper can be removed and replaced with another recording head. As a result, it is possible to prevent the normal pressure damper from being wastefully discarded, and it is possible to reduce the cost of parts.

Further, by providing the carriage with an anti-rotation portion for preventing rotation of the pressure damper at the time of mounting by contacting the pressure damper, the rotation of the pressure damper can be prevented even if the fastening screw is tightened. Can be.
Thereby, it is possible to reliably prevent a poor seal between the needle connection portion and the ink supply needle at the time of attachment.

[Brief description of the drawings]

FIG. 1 is a plan view of an ink jet printer according to an embodiment of the present invention.

FIG. 2 is a perspective view of a carriage portion.

FIG. 3 is a perspective view in which a carriage portion is inverted by 180 degrees around the Z axis in FIG. 2;

FIG. 4 is a front view of a pressure damper.

FIG. 5 is a cross-sectional view of the carriage and the pressure damper cut along the XZ plane in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink-jet printer 2 Carriage 2a Attachment base part 3 Recording paper 4 Recording head 5 Ink tank 6 Pressure damper 7 Ink supply tube 8 Ink supply needle 9 Seal member 10 Fixing screw 12 Driving pulley 13 Idling pulley 14 Timing belt 15 Drive motor 16 Platen 17 Cleaning section 18 Capping section 20 Flow path forming section 21 Fastening boss 21a Empty section 22 Projection 23 Backing plate 24 Filter mounting recess 40 Case 41 Piezoelectric vibrator 42 Nozzle plate 43 Nozzle opening 44 Ink supply pipe 45 Flow path unit 60 Ink chamber 61 Base 62 Ink inlet 63 Needle connection 63a Internal space 64 Elastic sheet 65 Filter 66 Extension 66a Fitting groove 67 Connection groove 68 Connection flow path 69 Fastening part 69a Fastening opening 80 Needle 81 82 the flange portion 83 reduced diameter portion 84 filter 90 annular portion 91 small-diameter annular portion 92 elastically the side wall portion of the large-diameter

Claims (4)

[Claims] A carriage provided with a mounting base and a recording head provided with an ink supply needle protruding therefrom; an ink supply tube for supplying ink in an ink tank provided on a printer main body side; A pressure damper having an ink chamber in which the ink is stored and a needle connection portion communicating with the ink chamber, wherein the ink chamber suppresses a pressure fluctuation of the ink caused when the carriage is moved in the main scanning direction. In the ink jet recording apparatus configured to supply the ink whose fluctuation has been suppressed to the recording head side through an ink supply needle connected to a needle connection section, the pressure damper has a fastening opening penetrating in a thickness direction. The mounting base of the carriage is provided with a seat on which the shaft of the fastening member can be fixed, and the shaft of the fastening member is placed in the fastening opening. In the inserted state, the fastening portion is restrained to the seat side by the fastening member, and the pressure damper is rigidly fixed to the carriage by holding the fastening portion between the fastening member and the seat. Inkjet recording device. 2. The fastening member is constituted by a male screw,
2. The ink jet recording apparatus according to claim 1, wherein a shaft portion of the male screw is screwed into the seat to press the fastening portion toward the seat with the head of the male screw. 3. The ink jet recording apparatus according to claim 2, wherein the carriage has a rotation preventing portion that abuts against the pressure damper to prevent the pressure damper from rotating together during mounting. 4. Inside the needle connection portion, the outer periphery of a proximal end opening is liquid-tightly joined to the pressure damper side, and the inner periphery of the distal end opening can contact the outer peripheral surface of the ink supply needle in a liquid-tight manner. A sealing member formed of a flexible elastic cylindrical member, the distal end opening of the sealing member is located on the back side of the needle connecting portion with respect to the proximal opening, and the opening area of the distal opening is changed to the proximal opening. The opening area is smaller than the opening area.
3. The ink jet recording apparatus according to any one of 3.