WO2021241344A1

WO2021241344A1 - Inkjet recording device

Info

Publication number: WO2021241344A1
Application number: PCT/JP2021/018912
Authority: WO
Inventors: 大輔江藤
Original assignee: 京セラドキュメントソリューションズ株式会社
Priority date: 2020-05-26
Filing date: 2021-05-19
Publication date: 2021-12-02
Also published as: JP2023101837A

Abstract

In this invention, a printer is equipped with: a plurality of head units (34Y, 34Bk, 34C, 34M) disposed so as to be aligned in a sheet transport direction Y, each having a plurality of discharge ports formed on the lower surface thereof in a parallel arrangement to a width direction X intersecting with the transport direction Y; a frame (60) comprising a first support member (61) and a second support member (62) facing each other in the width direction X, for supporting two edge portions, in the width direction X, of the plurality of head units (34Y, 34Bk, 34C, 34M), and a pair of connecting members (63) facing each other in the transport direction Y, for connecting the two edge portions, in the transport direction Y, of the first support member (61) and the second support member (62); and reinforcing members (70) provided between mutually adjacent head units (34Y, 34Bk, 34C, 34M), for connecting the first support member (61) to the second support member (62).

Description

Inkjet recording device

The present invention relates to an inkjet recording device that forms an image by ejecting ink.

In order to achieve good image quality with an inkjet recording device, it is necessary to land ink droplets accurately. However, since the temperature inside the inkjet recording device changes according to the operating conditions, the position of the ink ejection port shifts due to the thermal expansion of the head unit and the frame body that supports the head unit. In addition, misalignment also occurs due to deformation of the frame due to insufficient rigidity.

Therefore, conventionally, a technique for suppressing the misalignment of the discharge port of the head unit has been studied. For example, Patent Document 1 proposes to make the linear expansion coefficient of the head unit and the frame body equal to each other. Patent Document 2 proposes to control the temperature of the frame. In Patent Document 3, a long member to which a head unit is attached and a support frame to which both ends of the long member are attached and mounted on a main body frame are provided, and upper and lower surfaces of both ends of the long member are supported. It is proposed to fix it to the frame. In Patent Document 4, a high expansion member having a coefficient of linear expansion higher than that of the head holding plate is joined over the entire upper surface of the head holding plate that holds the head unit, and the head holding plate becomes high when expanded due to a temperature rise. A configuration has been proposed in which the linear expansion coefficient is curved so as to be convex upward due to the difference in linear expansion coefficient from the expansion member.

Japanese Unexamined Patent Publication No. 2005-138521 Japanese Unexamined Patent Publication No. 2010-269450 Japanese Unexamined Patent Publication No. 2007-112067 Japanese Unexamined Patent Publication No. 2013-49230

However, in the configuration proposed in Patent Document 1, since the choice of the material of the frame is limited, the degree of freedom in design is reduced, which causes an increase in size, an increase in cost, and a lack of rigidity. The configuration proposed in Patent Document 2 requires a mechanism for heating, cooling, temperature measurement, and temperature control, which causes the configuration to become complicated and costly. In the configuration proposed in Patent Document 3, since there is no escape allowance when the long member is stretched, the long member is distorted and curved. In addition, it is difficult to assemble because the upper and lower members of the long member cannot be moved. Further, since the frame body in Patent Documents 2 to 4 is a hollow rectangle and is not provided with a bridging member, there is a problem that it is easily deformed into a parallelogram due to insufficient rigidity.

In consideration of the above circumstances, it is an object of the present invention to provide an inkjet recording device capable of suppressing the displacement of the ejection port due to the deformation of the frame supporting the head unit.

In order to solve the above problems, in the inkjet recording apparatus according to the present invention, a plurality of discharge ports arranged in a width direction intersecting the sheet transport direction are formed on the lower surface, and a plurality of head units arranged side by side in the transport direction are provided. The first support member and the second support member facing the width direction and supporting both ends of the plurality of head units in the width direction, and the first support member and the second support member facing the transport direction. A frame body provided with a pair of connecting members for connecting both ends of the support member in the transport direction, and the first support member and the second support member provided between the head units adjacent to each other. It is characterized by including a reinforcing member to be connected.

According to the present invention, it is possible to suppress the displacement of the discharge port due to the deformation of the frame body that supports the head unit.

It is a front view which shows typically the internal structure of the printer which concerns on one Embodiment of this invention. It is a perspective view which shows the state after assembling the head unit, the frame body, and the reinforcing member which concerns on one Embodiment of this invention. It is a perspective view of the head unit provided with the recording head which concerns on one Embodiment of this invention. It is a perspective view of the head unit provided with the recording head which concerns on one Embodiment of this invention. It is a perspective view of the frame body which concerns on one Embodiment of this invention. It is an enlarged perspective view of the 1st support member which concerns on one Embodiment of this invention. It is an enlarged perspective view of the 2nd support member which concerns on one Embodiment of this invention. It is a perspective view of the reinforcing member which concerns on one Embodiment of this invention. It is a perspective view of the reinforcing member which concerns on one Embodiment of this invention. It is a perspective view which shows the state which the reinforcing member is attached to the frame body which concerns on one Embodiment of this invention. It is an enlarged perspective view which shows the state which the head unit is attached to the frame body which concerns on one Embodiment of this invention. It is a top view which shows typically the deformation of the frame body in the anteroposterior direction by thermal expansion. It is a top view which shows typically the deformation of the frame body in the anteroposterior direction by thermal expansion. It is a top view which shows typically the deformation of the frame body in the anteroposterior direction by thermal expansion. It is a top view which shows typically the deformation of the frame body in the anteroposterior direction by thermal expansion.

Hereinafter, the printer 1 (inkjet recording device) according to the embodiment of the present invention will be described with reference to the drawings.

First, the overall configuration of printer 1 will be described. FIG. 1 is a front view schematically showing the internal configuration of the printer 1. Hereinafter, the front side of the paper surface in FIG. 1 will be referred to as the front side (front side) of the printer 1, and the left-right orientation will be described with reference to the direction in which the printer 1 is viewed from the front. In each figure, U, Lo, L, R, Fr, and Rr indicate top, bottom, left, right, front, and back, respectively.

As shown in FIG. 1, the printer 1 is an inkjet image forming apparatus that forms an image by ejecting ink onto a sheet S (plain paper, coated paper, etc.), and is capable of single-sided printing and single-sided printing on the sheet S. Double-sided printing is possible. The printer 1 includes a box-shaped main body housing 10 in which various devices are housed. A pull-out paper cassette 15 in which the sheet S is housed is provided in the lower portion of the main body housing 10, and a manual feed tray 25 in which the sheet S is manually loaded is provided on the right side surface 11 of the main body housing 10. .. A paper ejection tray 17 on which the image-formed sheet S is loaded is provided above the manual feed tray 25, and an aftertreatment device adjacent to the left side of the printer 1 is provided above the left side surface 12 of the main body housing 10 (illustrated). A paper ejection port 19 for transporting the sheet S is formed in (omitted).

Head units 34Y, 34Bk, 34C, 34M (collectively referred to as the head unit 34) that form an image on the seat S are provided in the central portion of the main body housing 10, and an image is formed below the head unit 34. A transport unit 40 for transporting the sheet S to be transferred is provided, and a drying unit 48 for transporting and drying the image-formed sheet S is provided on the left side of the transport unit 40.

The transport unit 40 includes a drive roller 46a, a plurality of driven

rollers

46b, 46c, 46d, 46e, a transport belt 45 wound around these, and a suction unit 47. The transport belt 45 is driven by driving the drive roller 46a with a drive source (not shown) such as a motor. A large number of through holes (not shown) are formed in the transport belt 45. The suction unit 47 is arranged at a position facing the head unit 34 inside the transport belt 45, and sucks air to generate a negative pressure in the through hole of the transport belt 45.

On the right side of the transport unit 40, a first transport path 21 from the paper feed cassette 15 to the transport unit 40 and a manual feed transport path 27 merging from the manual feed tray 25 to the first transport path 21 are provided. A second transport path 22 from the drying unit 48 to the paper ejection port 19 is provided on the left side of the drying unit 48. Above the head unit 34, there is a third transport path 23 that branches from the second transport path 22 to reach the paper output tray 17, and a fourth transport that branches from the third transport path 23 and joins the first transport path 21. A road 24 is provided. At the branch point between the second transport path 22 and the third transport path 23 and the branch point between the third transport path 23 and the fourth transport path 24, a guide member for guiding the transport of the sheet S is provided. (Not shown).

The first transport path 21 is provided with a paper feed roller 16 and a resist roller pair 28 in this order from the upstream side in the transport direction (Y1 direction). The paper feed roller 16 feeds the sheets S housed in the paper feed cassette 15 one by one to the first transport path 21. The resist roller pair 28 corrects the skew of the sheet S and sends out the sheet S in synchronization with the timing of image formation.

The manual feed transfer path 27 joins the first transfer path 21 between the paper feed roller 16 and the resist roller pair 28. The manual feed transport path 27 is provided with a manual paper feed roller 26 that feeds the sheets S loaded on the manual feed tray 25 one by one to the manual feed transport path 27.

At the end of the second transport path 22 on the downstream side in the transport direction, a first paper discharge roller 20 for discharging the sheet S from the paper discharge port 19 is provided. At the end of the third transport path 23 on the downstream side in the transport direction, a second paper discharge roller 18 for discharging the sheet S to the paper discharge tray 17 is provided. In the case of double-sided printing, the fourth transport path 24 is turned upside down by switching back the sheet S from the Y2 direction to the Y3 direction, and is fed into the first transport path 21.

Next, the head unit 34, the frame body 60, and the reinforcing member 70 will be described in detail. FIG. 2 is a perspective view showing a state after assembling the head unit 34, the frame body 60, and the reinforcing member 70. 3 and 4 are perspective views of the head unit 34. FIG. 5 is a perspective view of the frame body 60. FIG. 6A is an enlarged perspective view of the first support member 61. FIG. 6B is an enlarged perspective view of the second support member 62. 7A and 7B are perspective views of the reinforcing member 70.

The printer 1 has a transport unit 40 for transporting the sheet S, and a plurality of head units arranged on the lower surface in a width direction X intersecting the transport direction Y of the sheet S and arranged side by side in the transport direction Y. The first support member 61 and the second support member 62 facing the width direction X and supporting both ends of the plurality of head units 34 in the width direction X, and the first support member 61 facing the transport direction Y. A frame body 60 including a pair of connecting members 63 for connecting both ends of the second support member 62 in the transport direction Y, and a head unit 34 adjacent to each other are provided between the first support member 61 and the first support member 61. (2) A reinforcing member 70 for connecting the support member 62 is provided.

[Head unit]
The head unit 34 includes a recording head 30 (see FIG. 4). The recording head 30 is a line head in which discharge ports (not shown) of a plurality of nozzles arranged in the width direction X of the sheet S intersecting the transport direction Y are formed on the lower surface. The portion of the lower surface of the recording head 30 where the discharge port is formed (referred to as the discharge port forming portion 35) is a substantially rectangular plate-shaped member made of metal, and includes a discharge port formed by drilling. ing. The material of the discharge port forming portion 35 is preferably stainless steel. A plurality of (three in this example) recording heads 30Y, 30Bk, 30C, and 30M (collectively referred to as recording heads 30) arranged in a staggered pattern for each ink color are housed in the housing 33 for each ink color. , Head units 34Y, 34Bk, 34C, 34M are formed for each color of ink.

Head units 34Y, 34Bk, 34C, and 34M are arranged in order from the upstream side in the transport direction Y, and eject yellow, black, cyan, and magenta inks, respectively. The head units 34Y, 34Bk, 34C, and 34M may be arranged in a different order from the illustrated example. The number and arrangement of the plurality of recording heads 30 forming the head unit 34 may be different from the illustrated example. Further, the head unit 34 may include one recording head 30.

A first end member 31 is provided on the upper part of the rear end of the housing 33 of the head unit 34. The first end member 31 is a plate-shaped member, and a first protruding portion 31A projecting rearward is formed at the rear end. A through hole 31H penetrating in the vertical direction is formed in the first protruding portion 31A. The through hole 31H is formed in a shape close to a triangle as a whole with a slightly tapered rear portion.

A second end member 32 is provided on the upper part of the front end of the housing 33 of the head unit 34. The second end member 32 is a plate-shaped member, and a second protruding portion 32A projecting forward is formed at the front end portion thereof. The second protruding portion 32A is provided with a ball plunger 32B for urging the ball to the right. The ball is exposed to the right of the right side surface of the second protrusion 32A.

At the lower left of the main body housing 10, a rectangular parallelepiped box-shaped container mounting portion 50 is provided. Ink containers 51Y, 51Bk, 51C, and 51M are mounted on the container mounting portion 50 in order from the top. The ink containers 51Y, 51Bk, 51C, and 51M are filled with yellow, black, cyan, and magenta inks, respectively, and are supplied to the recording heads 30Y, 30Bk, 30C, and 30M, respectively.

[Frame body]
The frame body 60 (see FIGS. 2 and 5) includes a first support member 61, a second support member 62, and a pair of connecting members 63, and supports the head unit 34. The first support member 61, the second support member 62, and the pair of connecting members 63 are all rectangular plate-shaped members made of metal. The material of the first support member 61, the second support member 62, and the pair of connecting members 63 is preferably an aluminum alloy. Aluminum alloy has the advantage that it can be processed in less time than steel.

The first support member 61 and the second support member 62 are members whose longitudinal direction is the transport direction Y, and are arranged so as to face each other in the width direction X. The first support member 61 is arranged on the rear side, and the second support member 62 is arranged on the front side. The pair of connecting members 63 are members whose longitudinal direction is the width direction X, and are arranged so as to face each other in the transport direction Y. The right end portions of the first support member 61 and the second support member 62 are connected to each other, and the left end portions of the first support member 61 and the second support member 62 are connected to each other by the connecting member 63. The first support member 61 and the second support member 62 and the pair of connecting members 63 are fastened with screws.

A pin 61P protruding upward is formed at a position corresponding to the head unit 34 at the upper end of the first support member 61 (see FIG. 6A). The diameter of the pin 61P is smaller than the through hole 31H of the first end member 31 of the head unit 34. A ball plunger 61B for urging the ball forward is provided at a position adjacent to the left and right of the pin 61P. The ball is exposed in front of the front surface of the first support member 61.

A notch 62U opened upward is formed at a position corresponding to the head unit 34 at the upper end of the second support member 62 (see FIG. 6B). The width of the notch 62U in the left-right direction is wider than that of the second protruding portion 32A of the head unit 34.

[Reinforcing member]
The reinforcing

members

70A and 70B (collectively referred to as the reinforcing members 70) are plate-shaped members made of metal. The reinforcing member 70A (see FIG. 7A) has an L-shaped cross-sectional shape in the width direction X, and the reinforcing member 70B (see FIG. 7B) has a U-shaped cross-sectional shape in the width direction X. The cross-sectional shapes of the reinforcing

members

70A and 70B may be a hollow box shape or a hollow circular shape. Further, the reinforcing

members

70A and 70B may be round bars or square bars.

The material of the reinforcing member 70 is preferably a steel plate. Linear expansion coefficient of the steel sheet is 11.7 × ^{10 -6} K, the linear expansion coefficient of aluminum is 23.9 × ^{10 -6} K. That is, the linear expansion coefficient of the reinforcing member 70 and the linear expansion coefficient of the frame body 60 are positive, and the linear expansion coefficient of the reinforcing member 70 is smaller than the linear expansion coefficient of the frame body 60. The Young's modulus of steel is 129.8 GPa, and the Young's modulus of aluminum is 70.3 GPa. That is, the Young's modulus of the reinforcing member 70 is higher than the Young's modulus of the frame body 60.

Further, the steel plate is an example of a material having the same main component as the discharge port forming portion 35 (stainless steel) of the head unit 34. The coefficient of linear expansion of the steel sheet is equivalent to the coefficient of linear expansion of stainless steel (10.4 × ^10-6K).

FIG. 8 is a perspective view showing a state in which the reinforcing member 70 is attached to the frame body 60. The rear end portion and the front end portion of the reinforcing member 70 are fastened to the first support member 61 and the second support member 62 using screws, respectively. In this example, two through holes 70H (see FIG. 7A) formed at the rear end portion and the front end portion of the reinforcing member 70 at predetermined intervals, and above the first support member 61 and the second support member 62. Screw holes 61H and 62H (see FIG. 5) formed at predetermined intervals on the end faces are fixed with screws, respectively. The reinforcing member 70 is provided at least between the head units 34 adjacent to each other. In this example, reinforcing members 70A having an L-shaped cross section are provided at three locations between the four head units 34.

Further, in addition to being between the head units 34 adjacent to each other, a reinforcing member 70 is provided on the outer side of the head unit 34 located at the end of the plurality of head units 34. Specifically, among the head units 34 located at the left and right ends, a reinforcing member having an L-shaped cross section is provided between the head unit 34 located at the left end and the connecting member 63 adjacent to the head unit 34 located at the left end. 70A is provided. On the other hand, among the head units 34 located at the left and right ends, a reinforcing member 70 can be provided between the head unit 34 located at the right end and the connecting member 63 adjacent to the head unit 34 located at the right end. Since the space is small, the reinforcing member 70B having a U-shaped cross section is fastened to the connecting member 63 adjacent to the head unit 34 located at the right end.

FIG. 9 is an enlarged perspective view showing a state in which the head unit 34 is attached to the frame body 60. The first end member 31 is attached to the first support member 61 of the frame body 60, and the second end member 32 is attached to the second support member 62.

The pin 61P of the first support member 61 is inserted into the through hole 31H of the first protrusion 31A of the first end member 31. Then, the ball of the ball plunger 61B provided on the first support member 61 is pressed against the rear end portion of the first end portion member 31. Since the diameter of the pin 61P is smaller than that of the through hole 31H and the ball is urged forward, the head unit 34 is pushed forward and the rear portion of the through hole 31H is pressed against the rear portion of the pin 61P. , The movement of the head unit 34 in the width direction X is restricted. That is, the first support member 61 regulates the movement of the plurality of head units 34 in the width direction X with respect to the first support member 61.

On the other hand, the second protruding portion 32A of the second end member 32 is inserted into the notch 62U of the second support member 62. At this time, the left side surface of the second protruding portion 32A comes into contact with the left side surface of the notch 62U, and the ball of the ball plunger 32P provided in the second protruding portion 32A comes into contact with the right side surface of the notch 62U. Is pushed to the left. Since the ball is urged to the right, the left side surface of the second protrusion 32A is pressed against the left side surface of the notch 62U, and the movement of the second protrusion 32A in the transport direction Y is restricted. That is, the second support member 62 regulates the movement of the plurality of head units 34 in the transport direction Y with respect to the second support member 62.

On the other hand, the movement of the second protrusion 32A in the width direction X with respect to the notch 62U is allowed. That is, the second support member 62 allows the movement of the plurality of head units 34 in the width direction X with respect to the second support member 62.

Next, the effect of the reinforcing member 70 will be described. 10A to 10D are plan views schematically showing deformation of the frame body 60 in the front-rear direction due to thermal expansion. 10A to 10C are comparative examples, and FIG. 10D is the present embodiment. Left-right deformation due to thermal expansion is ignored. The solid line indicates the frame body 60 before thermal expansion, and the broken line indicates the frame body 60 that has undergone thermal expansion.

In the comparative example shown in FIG. 10A, the reinforcing member 70 is not provided. Due to the thermal expansion of the connecting member 63, the first support member 61 is displaced rearward and the second support member 62 is displaced forward. Following the first support member 61, misalignment of the plurality of head units 34 in the width direction X occurs. Further, due to insufficient rigidity of the frame body 60, deformation of the parallel quadrilateral shape as shown by the alternate long and short dash line may occur.

In the comparative example shown in FIG. 10B, the reinforcing member 70 is provided in the central portion (between the second head unit 34 from the left and the third head unit 34). Since the rigidity of the frame body 60 is improved, deformation of the parallel quadrilateral shape is less likely to occur. However, since the coefficient of linear expansion of the reinforcing member 70 is lower than that of the frame body 60, the displacement amount of the central portion of the first support member 61 and the second support member 62 is smaller than that of both ends, and the first support member 61 and the first support member 61 and the second support member 62. 2 The support member 62 is curved. Therefore, color shift occurs due to the difference in the amount of positional shift in the width direction X of the plurality of head units 34.

In the comparative example shown in FIG. 10C, three reinforcing members 70 are provided between the four head units 34. The rigidity of the frame body 60 is improved as compared with the example of FIG. 10B. Further, since the expansion amounts of the three reinforcing members 70 are the same, the curvature of the first support member 61 within the range in which the reinforcing members 70 are provided is smaller than that in the example of FIG. 10B. Therefore, the color shift is suppressed as compared with the case of FIG. 10B.

The present embodiment shown in FIG. 10D shows the present embodiment in which the reinforcing member 70 is provided on the outside of the head unit 34 at the left and right ends in addition to the configuration of FIG. 10C. The rigidity of the frame body 60 is improved as compared with the example of FIG. 10C. Further, since the expansion amounts of the five reinforcing members 70 are the same, the curvature of the first support member 61 within the range in which the reinforcing members 70 are provided is smaller than that in the example of FIG. 10C. Therefore, the color shift is suppressed as compared with the example of FIG. 10C.

According to the printer 1 according to the present embodiment described above, since the head unit 70 is provided between the head units 34 adjacent to each other and connects the first support member 61 and the second support member 62, the head unit is provided. It is possible to suppress the displacement of the head unit 34 due to the deformation of the frame body 60 that supports the 34. Further, since the head unit 34 can be attached, maintained, replaced, etc. with the reinforcing member 70 attached to the frame body 60, deformation of the frame body 60 can be suppressed.

Further, according to the printer 1 according to the present embodiment, since the linear expansion coefficient of the reinforcing member 70 is smaller than the linear expansion coefficient of the frame body 60, the linear expansion coefficient of the reinforcing member 70 is equivalent to the linear expansion coefficient of the frame body 60. Compared with the above case, it is possible to suppress the displacement of the head unit 34 due to the thermal expansion of the frame body 60 that supports the head unit 34.

Further, according to the printer 1 according to the present embodiment, since the reinforcing member 70 is formed of the same material as the discharge port forming portion 35 of the head unit 34, the reinforcing member 70 and the discharge port forming portion 35 are formed. The amount of thermal expansion of is the same. Therefore, the distortion of the head unit 34 that occurs when the amount of thermal expansion of the reinforcing member 70 and the discharge port forming portion 35 is different is unlikely to occur.

Further, according to the printer 1 according to the present embodiment, since the Young's modulus of the reinforcing member 70 is higher than the Young's modulus of the frame body 60, the misalignment of the head unit 34 due to insufficient rigidity of the frame body 60 is suppressed.

Further, according to the printer 1 according to the present embodiment, the reinforcing member 70 is provided between the head units 34 adjacent to each other and outside the head unit 34 located at the end of the plurality of head units 34. Therefore, the misalignment of the head unit 34 can be further suppressed.

Further, according to the printer 1 according to the present embodiment, the reinforcing member 70 is located between the head units 34 adjacent to each other, as well as the head unit 34 located at the end of the plurality of head units 34 and the end. Since it is provided between the connecting member 63 adjacent to the head unit 34, the misalignment of the head unit 34 can be further suppressed.

Further, according to the printer 1 according to the present embodiment, the first support member 61 restricts the movement of the plurality of head units 34 in the width direction X with respect to the first support member 61, and the second support member 62 is the second. Since the movement of the plurality of head units 34 in the width direction X with respect to the support member 62 is allowed, the head unit 34 moves following the first support member 61. Therefore, distortion in the width direction X of the head unit 34 can be suppressed.

The above embodiment may be modified as follows.

In the above embodiment, in addition to being between the head units 34 adjacent to each other, an example is shown in which the reinforcing member 70 is provided outside the head unit 34 located at the end of the plurality of head units 34. The reinforcing member 70 may not be provided outside the head unit 34 located at the end.

In the above embodiment, an example is shown in which the reinforcing member 70 is made of a steel plate (a material having the same main component as the discharge port forming portion 35), but the reinforcing member 70 is made of the same material as the discharge port forming portion 35. That is, it may be made of stainless steel (coefficient of linear expansion 10.4 × ^10-6K). Also in this case, the coefficient of linear expansion of the reinforcing member 70 is smaller than the ^{coefficient of linear expansion of the frame 60 (23.9 × 10-6K).} Further, the Young's modulus of the reinforcing member 70 is higher than the Young's modulus of the frame body 60.

The reinforcing member 70 may be made of a material whose main component is different from that of the discharge port forming portion 35. Even in that case, it is desirable that the coefficient of linear expansion of the reinforcing member 70 is 0.8 times or more and 1.2 times or less of the coefficient of linear expansion of the discharge port forming portion 35 of the head unit 34.

Further, the reinforcing member 70 may be made of the same material (aluminum alloy) as the frame body 60.

In the above embodiment, a through hole 31H is formed in the first end member 31 of the head unit 34, and a pin 61P and a ball plunger 61B having a diameter smaller than that of the through hole 31H are provided in the first support member 61 of the frame body 60. However, instead of this configuration, the pin 61P may be configured to be fitted in the through hole 31H. In this case, the ball plunger 61B is unnecessary.

Claims

A plurality of head units arranged side by side in the transport direction are formed on the lower surface of the plurality of discharge ports arranged in a width direction intersecting the sheet transport direction.
The first support member and the second support member facing each other in the width direction and supporting both ends of the plurality of head units in the width direction, and the first support member and the second support member facing the transport direction. A frame body comprising a pair of connecting members connecting both ends of the member in the transport direction, and
An inkjet recording apparatus provided between the head units adjacent to each other and provided with a reinforcing member for connecting the first support member and the second support member.
The inkjet recording apparatus according to claim 1, wherein the coefficient of linear expansion of the reinforcing member is smaller than the coefficient of linear expansion of the frame.
The linear expansion coefficient of the reinforcing member is 0.8 times or more and 1.2 times or less of the linear expansion coefficient of the portion of the head unit in which the discharge port is formed, according to claim 1 or 2. The inkjet recording device described.
The inkjet recording apparatus according to claim 2 or 3, wherein the reinforcing member is made of the same material or the same main component as the portion of the head unit in which the discharge port is formed. ..
The inkjet recording apparatus according to any one of claims 1 to 4, wherein the Young's modulus of the reinforcing member is higher than the Young's modulus of the frame body.
Any of claims 1 to 5, wherein the reinforcing member is provided between the head units adjacent to each other and outside the head unit located at the end of the plurality of head units. The inkjet recording apparatus according to claim 1.
The reinforcing member is provided between the head units adjacent to each other and between the head unit located at the end of the plurality of head units and the connecting member adjacent to the head unit located at the end. The inkjet recording apparatus according to claim 6, wherein the inkjet recording apparatus is provided.
The inkjet recording apparatus according to any one of claims 1 to 7, wherein the reinforcing member is a plate-shaped member having an L-shaped cross-sectional shape in the width direction.
The claim is characterized in that the reinforcing member is a plate-shaped member and is fastened to the first support member and the second support member at at least two places with a predetermined interval in the transport direction. The inkjet recording apparatus according to any one of 1 to 8.
The first support member regulates the movement of the plurality of head units in the width direction with respect to the first support member.
The inkjet recording apparatus according to any one of claims 1 to 9, wherein the second support member allows the plurality of head units to move in the width direction with respect to the second support member.