JPH0986012A - Ink jet recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and inexpensive ink jet recording apparatus capable of attaching and detaching a recording head unit by simple operation, enhancing the positioning accuracy thereof and having high reliability. SOLUTION: The projections 41 provided to both side surfaces of a printing head unit 2 are inserted in the groove parts 14 of a carriage 1 to be dropped in projection receivers 15. Further, the printing head unit 2 is pressed by a printing head press lever 17. At this time, the positioning of the printing head unit 2 in Y- and Z-directions is performed by the energizing force of the printing head press lever 17 and the reaction force from the contact pin 19 of the carriage 1. The position of the printing head unit in an X-direction is set by pressing the printing head unit 2 by a pressure part 21. At a time of detachment, the printing head unit 2 is revolved by the elastic force of an almost L-shaped leaf spring 16 by releasing the printing head press lever 17 and can be easily replaced.

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 that ejects ink droplets to print on recording paper.

[0002]

2. Description of the Related Art In an ink jet recording apparatus in which a print head unit having a recording head section for ejecting ink droplets is attachable to and detachable from a recording apparatus, it is necessary to accurately position the recording head section. Due to high density in recent years, more accurate positioning has been required. In particular, in an inkjet recording apparatus that performs full-color printing using a print cartridge having a plurality of recording head units, color misregistration occurs unless the print head unit is accurately positioned at a predetermined position, and print quality is improved. It will be damaged. Positioning is particularly important in the main scanning direction, which is the scanning direction of the carriage, and the sub-scanning direction orthogonal thereto, and it is desirable to keep the distance from the recording medium constant.

Further, in order to always obtain a high quality recorded image,
An ink jet recording apparatus in which a deteriorated print head unit can be replaced has also been developed. In this case, the print head unit is a consumable item and will be replaced by the user. Therefore, the work of replacing the print head unit needs to be simple.

For example, in Japanese Patent Laid-Open No. 14454/1992, the recording head is positioned by pressing the recording head against the power supply connection board by a lock mechanism. In this positioning mechanism, the locking direction for positioning the recording head and the reaction force received from the power supply connection board necessary for electrical connection are in opposite directions, and the pressing force for positioning is for the electrical connection. A large force is required to exceed the reaction force and stabilize the position of the print head unit.

When the user performs the work of replacing the print head unit, if the operating force is unnecessarily large as in the above-mentioned document, the user may feel uncomfortable and anxious about the operation. Also,
When using a positioning mechanism that requires such a strong pressing force, it is necessary to strengthen the rigidity of the carriage and the lock member, which causes problems such as an increase in cost and an increase in size of the device.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and the recording head unit can be attached and detached by a simple operation, and the positioning accuracy can be improved, which is small and inexpensive. It is an object of the present invention to provide a highly reliable inkjet recording device.

[0007]

According to a first aspect of the present invention, there is provided a recording head unit including a recording head unit for ejecting ink droplets to record on a recording medium, and the recording head unit is detachably accommodated. It has a carriage part that can
In an inkjet recording apparatus that performs relative recording between the carriage unit and the recording medium in the sub-scanning direction and moves the carriage unit in a main scanning direction perpendicular to the sub-scanning direction, the recording head unit is attached to the carriage unit. A first positioning unit that determines the position of the shaft in the main scanning direction, a second positioning unit that determines the position in the main scanning direction, and a first positioning unit that restricts rotation about the shaft as a rotation shaft when mounting. It is characterized by having three positioning means.

According to a second aspect of the present invention, in the ink jet recording apparatus according to the first aspect, the first positioning means is two recording head unit side engaging means provided on both sides of the recording head unit. And two corresponding carriage-side engaging means provided on the carriage portion.

According to a third aspect of the present invention, in the ink jet recording apparatus according to the first aspect, the second positioning means includes a pressing means that is formed on a side surface of the carriage section and presses the recording head unit. It is characterized by that.

According to a fourth aspect of the present invention, in the ink jet recording apparatus according to the first aspect, the third positioning means is a lever provided on the carriage portion and supported by an elastic body, and the recording head unit. It is characterized in that it is constituted by a position restricting portion provided in the.

According to a fifth aspect of the present invention, in the ink jet recording apparatus according to the fourth aspect, the lever has a substantially V-shaped cross section having first and second slopes. It is characterized in that the position regulating portion of the recording head unit is pressed at the end portion of the substantially V shape.

According to a sixth aspect of the present invention, in the ink jet recording apparatus according to the fourth or fifth aspect, a plurality of connector pins for electrically connecting to the recording head unit are arranged on the carriage portion. A connector is provided, and the connector pin is pressed when the recording head unit is mounted. The pressing force for positioning in the sub-scanning direction is the combined force of the reaction force of the connector pin and the elastic force of the lever. The fulcrum of the lever has an elongated hole.

According to a seventh aspect of the invention, in the ink jet recording apparatus according to any one of the first to sixth aspects, a substantially L-shaped leaf spring is further provided which is locked to the bottom of the carriage portion. When the third positioning means is released, the leaf spring rotates the recording head unit about the shaft as a rotation shaft.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing an example of a mode in which a print head unit is mounted on a carriage in an embodiment of an ink jet recording apparatus of the present invention,
FIG. 2 is a sectional view showing an example of the carriage as well.
In the figure, 1 is a carriage, 2 is a print head unit,
Reference numeral 11 is a shaft hole, 12 is a guide plate receiver, 13 is an opening, 14 is a groove portion, 15 is a projection receiver, 15a and 15b are reference surfaces, 16 is a leaf spring, 17 is a print head pressing lever, and 18 is a print head contact portion. , 19 are contact pins, 20 is an ink tank holder, 21 is a pressing portion, 31
Is a shaft, 32 is a long hole, 33 is a spring, 34 is a contact substrate, 35 is a connector, 36 is a position sensor, 37 is a timing fence, 38 is a flexible cable, 41 is a protrusion, 42 is a print head fixing portion, and 43 is a substrate. , 44 is an ink introducing portion, 45 is a black head, and 46 is a color head.

The carriage 1 is provided with a shaft hole 11 and a guide plate receiver 12, and is movable by a main shaft and a guide plate of the recording apparatus main body. In addition, the print head unit 2
For mounting the opening 13 at the center of the carriage 1.
However, the groove portion 14 is provided on both side walls, the leaf spring 16 is provided on the bottom surface of the rear portion, and the pressing portion 21 is provided on the right side wall in the drawing.

The groove portion 14 is for inserting the protrusion 41 of the carriage 2, and the deepest portion of the groove portion 14 is the protrusion receiver 1.
5 and supports the protrusion 41 of the carriage 2.
The groove 14 has a wide upper portion so that the protrusion 41 of the carriage 2 can be easily inserted. The portion of the protrusion receiver 15 has a width substantially equal to the diameter of the protrusion 41.

The leaf spring 16 is a substantially L-shaped member which is fixed to the bottom of the carriage 1 and has a portion extending upward. In this example, the two leaf springs 16 are integrally formed. The portion of the leaf spring 16 that extends upward is slightly inclined forward when the print head unit 2 is not mounted. When the print head unit 2 is attached, the print head unit 2 is deformed and moved rearward, and the carriage 1 is pressed toward the front side. When the print head unit 2 is removed, the print head unit 2 is pushed forward to rotate the print head unit 2.

The pressing portion 21 is formed so as to have a convex portion inside, and is mounted in the print head unit 2
In the direction of the left side wall in the figure. Here, it is configured as a part of the side wall of the carriage 1, and utilizes the elastic force of the material forming the carriage 1. Although the pressing portion 21 is provided on the right side wall of the carriage in this example, it may be provided on the left side wall.

The print head pressing lever 17 is shown in FIG.
As shown in FIG. 2, both ends thereof are rotatably fixed to the shaft 31 by the long holes 32 and are biased by the spring 33. When mounting the print head unit 2, the print head pressing lever 17 is rotated upward, and after the print head unit 2 is mounted, the print head pressing lever 17 is released. Hold down. The cross section of the print head pressing lever 17 is bent in a dogleg shape, and the end thereof abuts the print head abutting portion 18. Therefore, the print head pressing lever 17 is obliquely pressed against the print head contact portion 18. The elongated hole 32 allows the print head pressing lever 1 to handle variations in the force applied to the print head contact portion 18.
7 is slidable, so that the pressing force can be generated in the print head unit 2 more reliably. When the print head unit 2 is attached / detached, the print head unit 2 can be rotated and removed by simply rotating the print head pressing lever 17 upward.

In this example, a grip portion is provided by projecting a part of the print head pressing lever 17 to improve the operability for the user. Further, in FIG. 1, a part of the print head pressing lever 17 is broken so that the internal print head contact portion 18 is visible. The print head contact portion 18 contacts the print head fixing portion 42 of the print head unit 2 when the print head unit 2 is mounted, and positions the print head unit 2.

A contact substrate 34 is provided on the back surface of the carriage 1 as shown in FIG. 2, and is electrically connected to the main body of the recording apparatus by a flexible cable 38 or the like. A connector 35 is mounted on the contact board 34. The contact pin 19 of the connector 35 is
This is a part for making electrical connection with the print head unit 2, and supplies various signals for power supply and recording supplied from the recording apparatus main body to the print head unit 2. In addition, the signal from the print head unit 2 may be sent to the recording apparatus main body. The contact substrate 34 is further provided with a position sensor 36, and detects a mark written on the timing fence 37.

An ink tank retainer 20 provided on the upper portion of the carriage 1 is provided to lock the ink tank. By the pressing force of the ink tank retainer 20, the ink tank is pressed by the ink introducing portion 44 of the print head unit 2, and the connecting portion between the ink tank and the print head unit 2 is sealed to achieve liquid communication. Further, the vicinity of the ink tank holder 20 is dented, and the ink tank is positioned by the concave portion.

The print head unit 2 is provided with an ink introduction section 44 for each color, which is fluidly connected to each ink tank and receives the supplied ink. Here, an ink introducing section 44 for receiving the black ink and the inks of the other three colors is provided. Among the inks received by the ink introducing section 44, black ink is supplied to the black head 45, and inks of other colors are supplied to the color head 46. Black head 45
A large number of nozzles are arranged in the color head 46 in the Y direction in the drawing. With the black head 45, black recording can be performed using all the arranged nozzles. In the color head 46, the arrayed nozzles are divided into three groups, and the recording of each color is performed using the nozzles of each group. There may be a nozzle that is not used.

A drive circuit for driving the black head 45 and the color head 46 is arranged in the print head unit 2, and a substrate 43 electrically connected to the contact pins 19 of the carriage 1 is provided. Has been. Here, two sheets are provided corresponding to each head. The substrate 43 can be made of, for example, a metal, and has a black head 45 and a color head 4
It is also used as a heat sink for heat dissipation of No. 6.

A protrusion 41 is provided on the side surface of the print head unit 2, and a print head fixing portion 42 is provided on the upper portion, which is used when the print head unit 2 is mounted on the carriage 1.
The protrusion 41 is inserted into the groove portion 14 of the carriage 1 and fits with the protrusion receiver 15 to hold and position the print head unit 2. In addition, the print head fixing portion 42
The rear surface of the carriage 1 is the print head contact portion 1 of the carriage 1.
8 and the print head pressing lever 17 abuts on the lower part of the front surface and is pressed and fixed.

The printhead unit 2 is attached to the carriage 1.
When mounting the print head unit 2, the print head unit 2 is inserted from above the carriage 1 so that the black head 45 and the color head 46 of the print head unit 2 are exposed from the opening 13 of the carriage 1. At this time, the protrusions 41 on both sides of the print head unit 2 are inserted so as to be inserted into the corresponding groove portions 14 of the carriage 1.
Since the upper portion of the groove portion 14 is wide, the print head unit 2 can be inserted at a slight angle and can be easily inserted. In the print head unit 2, the protrusion 41 has the protrusion receiver 1 at the deepest portion of the groove portion 14 of the carriage 1.
5 is inserted until it abuts. In this state, L
A portion of the character-shaped leaf spring 16 that extends upward and the back surface of the print head unit 2 contact each other, and the elastic force of the leaf spring 16 holds the print head unit 2 in an inclined state.

The print head pressing lever 17 is rotated so as to be lifted, and the print head unit 2 is rotated inward. As a result, the back surface of the print head fixing portion 42 of the print head unit 2 contacts the print head contact portion 18 of the carriage 1. When the print head pressing lever 17 is released, one end of the print head pressing lever abuts the lower front surface of the print head fixing portion 42 by the urging force of the spring 33 provided on the print head pressing lever 17, and the print head unit 2
Hold down. At this time, the contact portion of the print head unit 2 (not shown) is pressed against the contact pin 19 of the carriage 1 and electrically connected.

FIG. 3 is a sectional view showing an example when the print head unit is mounted in the embodiment of the ink jet recording apparatus of the present invention. Reference numerals in the figure are the same as those in FIGS. 1 and 2. Print head unit 2 to carriage 1
When the print head unit 2 and the carriage 1 are attached to each other, the reference surfaces of both the print head unit 2 and the carriage 1 must be in proper contact with each other, and the positions of the nozzle portions of the recording heads 45 and 46 must be accurately positioned.

In general, when a certain component is positioned and assembled, the first reference surface is positioned at three points and the second reference surface is used.
It is known that the most stable structure can be achieved by positioning at two points on the reference plane of No. 1 and at one point on the third reference plane. In this configuration, positioning in the Y direction by the print head fixing portion 42 of the print head unit 2 and the print head contact portion 18 of the carriage 1 and the protrusions 4 on both sides of the print head unit 2 are performed.
1 and the projection receivers 15 on both sides of the carriage 1 perform positioning. In the Z direction, positioning is performed by the projections 41 on both sides of the print head unit 2 and the projection receivers 15 on both sides of the carriage 1. Further, in the X direction, when the pressing portion 21 is provided on the right side of the carriage, positioning is performed by contact between the left projection 41 of the print head unit 2 and the surface of the left projection receiver 15 of the carriage 1. ing. Positioning in the X direction may be performed by contact between the left side surface of the print head unit 2 and the left inner side surface of the carriage 1.

For the positioning in the Y direction, the pressing force of the print head pressing lever 17 and the reaction force of the contact pin 19 are used. When the print head unit 2 is mounted, as shown by a thick arrow in FIG. 3, a force accompanied by a moment generated by the pressing force of the print head pressing lever 17 is about 30 ° from the Z direction to the −Y direction. The print head unit 2 in the Z direction.
Direction and -Y direction. As a result, the print head fixing portion 42 of the print head unit 2 and the print head abutting portion 18 of the carriage 1 are surely brought into contact with each other for positioning, and the two projections 41 of the print head unit 2 are respectively provided on the carriage 1. Projection holder 1
5 is pressed against the reference surface 15a (see FIG. 2) that is the front surface of the member 5 to perform positioning in the Y direction.

When the print head unit 2 is mounted, the contact pins 19 of the carriage 1 are electrically connected to the contact portions of the print head unit 2 not shown. In order to make stable electrical connection, the contact pin 19 needs a pressing force to the contact portion on the print head unit 2 side. The reaction force of each contact pin 19 at this time needs to be about 80 gf.
For example, if there are 15 signal lines, the total reaction force of the contact pins 19 is about 1.2 kgf. The reaction force from the contact pin 19 is generated in a direction forming an angle of about 30 ° from the Y direction to the −Y direction, as indicated by a thick arrow in FIG. As a result, the force with which the two protrusions 41 of the print head unit 2 are pressed against the reference surfaces 15a of the respective protrusion receivers 15 of the carriage 1 can be further increased, and the positioning in the Y direction can be performed more accurately. Further, the leaf spring 16 also has a pressing force in the Y direction when the print head unit 2 is mounted, and this pressing force further presses the protrusion 41 against the reference surface 15a.

The pressing force of the print head pressing lever 17 and the reaction force of the contact pin 19 are also used for positioning in the Z direction. Due to the Z-direction component of these forces and the own weight of the print head unit 2, the two projections 41 of the print head unit 2 are pressed against the reference surface 15b (see FIG. 2) which is the bottom surface of each projection receiver 15 of the carriage 1. Then, positioning in the Z direction is performed.

In the positioning in the X direction, the positional deviation of the nozzle has less influence on the image quality as compared with the positioning in the Y and Z directions, and the deviation in the electrical connection at the contact pin 19 is allowed. Positioning can be done with. In this example, a pressing portion 21 is provided in a part of the carriage 1, and the print head unit 2 is pressed by the elastic force of the pressing portion 21 to perform positioning. In the example shown in FIG. 1, since the pressing portion 21 is provided on the right side of the carriage 1, the mounted print head unit 2 is pressed to the left side, and the end surface of the protrusion 41 and the side surface of the protrusion receiver 15 come into contact with each other, and thus the X direction. Is positioned. Alternatively, the left side surface of the print head unit 2 and the left inner side surface of the carriage 1 may be brought into contact with each other to perform positioning in the X direction. Further, the pressing portion 21 may be provided on the left side of the carriage. In this case, the print head unit 2 is pushed to the right side and positioned.

As described above, when the print head unit 2 is mounted on the carriage 1, the projection 41 of the print head unit 2 is inserted into the groove portion 14 and dropped into the groove portion 14, and then the print head pressing lever 17 is lifted to lift the print head unit 2. The print head unit 2 can be mounted by a very simple operation of pushing inward and releasing the print head pressing lever 17 to press the print head unit 2. Moreover, the mounted print head unit 2 is accurately positioned. Therefore, the print head unit 2 is not displaced due to a defect in the mounting method, and the print head unit 2 can always be positioned at an optimum position. Further, the force required to push in the print head unit 2 is only the force that deforms the leaf spring 16 and the force that presses the contact portion against the contact pin 19, which is a force in the rotational direction, and therefore is extremely small. It is possible to wear it. Furthermore, the distance traveled when the print head unit 2 is mounted is small, the entire carriage can be downsized, and an inexpensive device can be configured.

FIG. 4 is a sectional view showing an example when the print head pressing lever is released in the embodiment of the ink jet recording apparatus of the present invention. If it becomes necessary to replace the print head unit 2 due to a failure or the like, the print head pressing lever 17 is lifted and rotated. As a result, the print head unit 2 loses the force for positioning the print head fixing portion 42 and the print head abutting portion 18 of the carriage 1 for positioning, and receives the force in the Y direction from the contact pin 19 and the leaf spring 16. It will be. Due to this force, the print head unit 2 receives a rotational force in the direction of being pushed forward. The leaf spring 16 has a larger elastic force than the frictional force of the pressing portion 21 in the X direction, and generates a stroke larger than that of the contact pin 19. Therefore, the print head unit 2 is rotated by the elastic force of the leaf spring 16 about the axis connecting both the protrusions 41. As a result, as shown in FIG.
Will be kept tilted forward. After that, even if the rotation of the print head pressing lever 17 is released,
Printhead fixing portion 42 of printhead unit 2
The print head pressing lever 17 does not come into contact with the print head unit 2 and the print head unit 2 does not return to the positioning portion. As a result, the user can visually recognize that the print head unit 2 can be taken out, and the print head unit 2 can be taken out easily, so that the print head unit 2 can be easily replaced.

FIG. 5 is a perspective view showing an example of a mode of mounting the ink tank on the print head unit in the embodiment of the ink jet recording apparatus of the present invention.
FIG. 6 is a perspective view showing an example of a mode after the ink tank is mounted. In the figure, the same parts as those in FIG. 3 is an ink tank, and 51 is a fitting part. FIG. 5 shows a state in which the print head unit 2 is attached to the carriage 1, and further shows a state in which the ink tank 3 is attached. Here, four ink tanks of black and three other color ink tanks are installed.

A fitting portion 51 is provided in each ink tank 3. When mounting the ink tank 3, hold the grip portion of the ink tank 3 and insert it at a predetermined position. Then, the fitting portion 51 of the ink tank 3 and the ink tank retainer 20 of the carriage 1 are fitted, and the ink tank 3 is pressed against the print head unit 2 in the Z direction. Due to this pressing force, the joint port provided on the lower surface of the ink tank 3 is brought into pressure contact with each ink introducing portion 44 of the print head unit 2 to form a sealed ink flow path.

Further, the lower part of the front surface of the ink tank 3 comes into contact with the front part of the carriage, and the positioning in the Y direction is performed.
The positioning in the Y direction is also performed by a wall provided in the back of the ink introducing portion 44 of the print head unit 2 and a recess provided near the ink tank holder 20 of the carriage 1. Further, positioning in the X direction is performed by the partition wall provided around the ink introducing portion 44 of the print head unit 2 and the concave portion provided near the ink tank holder 20 of the carriage 1. Further, in this example, a claw is provided on the surface of the carriage 1 facing the bottom surface of the ink tank 3, and the claw also presses and fixes the ink tank 3. FIG. 6 shows a state in which four ink tanks 3 are mounted.

In the above example, the print head unit 2
The print head unit 2 is positioned by providing the projections 41 on the left and right sides of the print head and the projection receivers 15 on the side wall of the carriage 1. However, not limited to this, for example, the carriage 1
The protrusions may be provided on the inner surfaces of the left and right side walls of the print head unit 2 and the grooves may be provided in the print head unit 2. Further, various locking methods can be applied other than the structure using the projection and the groove, as long as the shaft in the X direction can be positioned.

In the above example, the configuration example in which recording is performed using black and the other three colors has been shown. At this time, since black is used more frequently than the other three colors, the capacity can be set larger than the other three colors. Not limited to such a color configuration, three colors other than black may be used, or five or more ink supply systems may be used. Of course, it can also be applied to a monochrome recording device. Further, in addition to the two head structure of the black head 45 and the color head 46, it is also possible to adopt a structure in which a print head is provided for each color.

Further, the present invention is not limited to the one in which the print head unit and the ink tank are formed separately as in the above-mentioned example, and for example, the ink tank and the print head are integrally formed. In this case, a similar mounting mechanism can be used.

In the above example, the recording head moves in the X direction. However, the present invention is not limited to this, and the recording medium may move in the X direction. In the Y direction, either the method of moving the recording head or the method of moving the recording medium may be used. In the case of the method of moving the recording medium, the method of feeding the recording medium is arbitrary.

[0043]

As is apparent from the above description, according to the present invention, when the recording head unit is mounted, the first positioning means for determining the position of the axis in the main scanning direction and the main scanning direction. Since the positioning is performed by the second positioning means for determining the position and the third positioning means for restricting the rotation about the shaft determined by the first positioning means as the rotation axis, the positioning accuracy is improved with a simple configuration. It is possible to provide a small-sized, inexpensive and highly reliable inkjet recording device.

At this time, the first positioning means can be carried out, for example, by the engaging means provided on the recording head unit and the carriage portion as in the invention described in claim 2, and the first positioning can be performed. It can be done easily. Further, the second positioning operation is performed by configuring the second positioning means to press the recording head unit by the pressing means formed on the side surface of the carriage section as in the invention described in claim 3, for example. Is unnecessary, and positioning can be performed accurately.

Further, as the third positioning means, for example, by pressing the recording head unit with a lever supported by an elastic body as in the invention described in claim 4, it is possible to perform a simple operation of operating the lever. The recording head unit can be mounted. Moreover, the positioning can be performed with high accuracy. The cross section of the lever has a dogleg shape as in the invention described in claim 5, and the recording head unit is accurately positioned in the sub-scanning direction and the ink ejection direction by pressing the recording head unit at the end thereof. can do. At this time, as in the sixth aspect of the invention, by making the fulcrum of the lever a long hole, it is possible to absorb the variation in the pressing direction of the recording head unit. Further, by utilizing the reaction force of the connector pin, the positioning in the sub-scanning direction can be performed more reliably and accurately.

Further, as in the invention described in claim 7, by providing the substantially L-shaped leaf spring, the recording head unit can be rotated when the third positioning means, for example, the lever is released. . As a result, the recording head unit can be easily attached and detached, and the print head unit can be attached and detached by a simple operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a mode of mounting a print head unit on a carriage in an embodiment of an inkjet recording apparatus of the present invention.

FIG. 2 is a cross-sectional view showing an example of a carriage in the embodiment of the inkjet recording apparatus of the present invention.

FIG. 3 is a cross-sectional view showing an example when a print head unit is mounted in an embodiment of the inkjet recording apparatus of the present invention.

FIG. 4 is a cross-sectional view showing an example when the print head pressing lever is released in the embodiment of the inkjet recording apparatus of the present invention.

FIG. 5 is a perspective view showing an example of an aspect when an ink tank is attached to a print head unit in an embodiment of the inkjet recording apparatus of the present invention.

FIG. 6 is a perspective view showing an example of a mode after mounting an ink tank in the embodiment of the inkjet recording apparatus of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Carriage, 2 ... Print head unit, 3 ... Ink tank, 11 ... Shaft hole, 12 ... Guide plate receiver, 13 ... Opening, 14 ... Groove part, 15 ... Projection receiver, 15
a, 15b ... Reference plane, 16 ... Leaf spring, 17 ... Print head pressing lever, 18 ... Print head contact portion, 19
… Contact pins, 20… Ink tank holders, 21…
Pressing part, 31 ... Shaft, 32 ... Oblong hole, 33 ... Spring, 34 ... Contact board, 35 ... Connector, 36 ... Position sensor, 3
7 ... Timing fence, 38 ... Flexible cable, 41 ... Protrusion, 42 ... Print head fixing part, 43 ...
Substrate, 44 ... Ink introduction section, 45 ... Black head,
46 ... Head for color, 51 ... Fitting part.

Claims (7)

[Claims] 1. A recording head unit including a recording head unit for ejecting ink droplets to record on a recording medium, and a carriage unit capable of detachably accommodating the recording head unit. In an inkjet recording apparatus that performs recording by moving the carriage in a main scanning direction perpendicular to the sub scanning direction while the medium relatively moves in the sub scanning direction, when the recording head unit is mounted on the carriage unit, It has first positioning means for determining the position of the axis in the scanning direction, second positioning means for determining the position in the main scanning direction, and third positioning means for restricting rotation about the axis as a rotation axis. An ink jet recording apparatus characterized by the above. 2. The first positioning means includes two recording head unit side engaging means provided on both sides of the recording head unit and corresponding two carriage side engaging means provided on the carriage portion. The inkjet recording apparatus according to claim 1, wherein the inkjet recording apparatus is configured by: 3. The ink jet recording apparatus according to claim 1, wherein the second positioning unit includes a pressing unit that is formed on a side surface of the carriage unit and presses the recording head unit. 4. The third positioning means comprises a lever provided on the carriage portion and supported by an elastic body, and a position restricting portion provided on the recording head unit. Item 2. The inkjet recording device according to item 1. 5. The lever has a substantially V-shaped cross section having first and second slopes, and the position regulation of the recording head unit is provided at an end of the substantially V-shaped shape. The ink jet recording apparatus according to claim 4, wherein the portion is pressed. 6. The carriage unit further includes a connector in which a plurality of connector pins for electrically connecting to the recording head unit are arranged, and the connector pins are pressed when the recording head unit is mounted. The pressing force for positioning in the sub-scanning direction is performed by a combined force of the reaction force of the connector pin and the elastic force of the lever, and the fulcrum of the lever has an elongated hole. 4. The inkjet recording device according to 4 or 5. 7. The L-shaped member is locked to the bottom of the carriage unit.
7. A character-shaped leaf spring is further provided, and the recording head unit is rotated about the shaft by the leaf spring when the third positioning means is released. The ink jet recording apparatus according to any one of claims 1.