JP2023027951A - Electrical box of liquid droplet discharge unit and liquid discharge device - Google Patents

Abstract

To prevent heat dissipation of a substrate member from deteriorating with time.SOLUTION: Electrical boxes 200 are mounted on a plurality of liquid droplet discharge units 33A-33D of an inkjet recording device 1 configured so that a recording medium (a sheet material P) is conveyed by a rotary drum 31. The electrical boxes 200 have substrate members 210 and cooling members 230, and are arranged radially on an upper outer periphery of the rotary drum 31. The cooling members 230 are arranged at one sides in an inclination direction of the electrical boxes, in a circumferential direction of the rotary drum, and the substrate members 210 are arranged to be insertable into in a direction of a center of the rotary drum 31 from above the electrical boxes 200. The substrate members 210 contact the cooling members 230 by own weight thereof.SELECTED DRAWING: Figure 9A

Description

1. Field of the Invention The present invention relates to an electrical box for a droplet ejection unit and a device for ejecting liquid.

An inkjet recording apparatus as a device for ejecting liquid is equipped with a plurality of droplet ejection units (C, M, Y, K) for ejecting ink around a rotating drum that conveys a recording medium (see FIG. 1 of Patent Document 1). ). As shown in FIG. 12A, electrical equipment boxes 200 for controlling the ejection of droplets are provided in these droplet ejection units. In each electrical box 200, a substrate member 210 and a cooling member (heat sink) 230 are arranged as shown in FIGS. 12B and 12C. By transmitting heat emitted from the driver IC and the like of the substrate member 210 to the cooling member 230, an excessive temperature rise of the substrate member 210 is suppressed.

Conventionally, the substrate member 210 is attached with a heat dissipation member 211 made of metal such as aluminum, iron, or copper, which has good heat transfer properties, in order to improve heat dissipation. Further, a thermally conductive member 220 having elasticity is arranged between the heat radiating member 211 and the cooling member 230 . The cooling member 230 , the heat conducting member 220 and the heat radiating member 211 are fastened and fixed with a plurality of fixing screws 231 .

The thermally conductive member 220 having elasticity tends to undergo compressive plastic deformation over time. Therefore, even if the heat dissipation property of the substrate member 210 is initially good, a gap C is formed between the heat dissipation member 211 and the heat conduction member 220 as shown in FIG. 12D when the heat conduction member 220 undergoes compressive plastic deformation over time. As a result, backlash occurs in the substrate member 210, which may cause loosening L of the fixing screw 231 or a decrease in the heat radiation performance of the substrate member 210, resulting in failure.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to prevent deterioration in the heat radiation performance of a substrate member of an electrical box over time.

In order to solve the above-described problems, an electrical equipment box according to the present invention is an electrical equipment box that is installed in a plurality of liquid droplet ejection units of a liquid ejection device that conveys a recording medium by a rotating drum, the electrical equipment box comprising: In the electrical equipment box having a substrate member and a cooling member and radially arranged on the outer periphery of the upper portion of the rotating drum, the cooling member is disposed on one side of the electrical equipment box in the circumferential direction of the rotating drum in the inclined direction, A substrate member is disposed so as to be insertable from the upper portion of the electric equipment box toward the center of the rotary drum, and is brought into contact with the cooling member by the weight of the substrate member.

Advantageous Effects of Invention According to the present invention, it is possible to prevent the heat dissipation of the substrate member of the electrical box from deteriorating over time.

1 is a schematic diagram of an inkjet recording apparatus according to the present invention; FIG. FIG. 3 is a plan view of the droplet discharge unit viewed from the nozzle surface side; FIG. 3 is a plan view of the droplet discharge unit viewed from the side opposite to the nozzle surface; FIG. 6 is a cross-sectional view of the droplet discharge unit corresponding to line AA in FIG. 5; 4 is a plan view of a mounting member of the droplet ejection unit; FIG. FIG. 6 is a cross-sectional view along line AA of FIG. 5; FIG. 6 is a front view of FIG. 5; FIG. 4 is a front view showing a state of arrangement of droplet ejection units with respect to a rotating drum; FIG. 4 is a front view showing the state of arrangement of the electrical equipment box with respect to the rotating drum; It is a sectional view of an electrical equipment box. It is a figure which shows the state of the gravity which acts on the board|substrate member of an electrical equipment box. FIG. 10 is a diagram in which the taper angles of the heat radiating member are changed to A and A' depending on the inclination angles θa and θb of the electrical equipment box; FIG. 10 is a view of an embodiment in which a biasing member is attached to the base member; (a) A cross-sectional view of the electric equipment box with the heat dissipating member omitted, and (b) a cross-sectional view with the heat conducting member also omitted. FIG. 10 is a front view showing a state of arrangement of a conventional electrical equipment box with respect to a rotating drum; FIG. 10 is a cross-sectional view of a conventional electrical equipment box; FIG. 10 is a perspective view of a conventional electrical equipment box; FIG. 10 is a cross-sectional view showing a state in which a thermally conductive member of a conventional electrical equipment box has undergone compressive plastic deformation over time.

(Inkjet recording device)
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic diagram of an inkjet recording apparatus 1 as a device for ejecting liquid. The inkjet recording apparatus 1 includes a loading unit 10 for loading a sheet material P as an application target (recording medium) to which liquid is applied, a preprocessing unit 20, a printing unit 30, a drying unit 40, an unloading unit 50, A reversing mechanism 60 is provided.

In the inkjet recording apparatus 1, the pretreatment unit 20, which is pretreatment means, applies (applies) a pretreatment liquid to the sheet material P carried in (supplied) from the carry-in unit 10 as necessary, and the printing unit 30 applies the pretreatment liquid. After the liquid is applied and the required printing is performed, the liquid adhering to the sheet material P is dried in the drying section 40 , the sheet material P is discharged to the carry-out section 50 .

The carry-in unit 10 includes a carry-in tray 11 (a lower carry-in tray 11A and an upper carry-in tray 11B) that accommodates a plurality of sheet materials P, and a feeding device 12 (12A) that separates and feeds out the sheet materials P one by one from the carry-in tray 11. , 12B) to supply the sheet material P to the pre-processing section 20 .

The pretreatment unit 20 includes a coating unit 21, which is a treatment liquid application unit, for applying a treatment liquid having an effect of, for example, aggregating the colorant of the ink and preventing show-through, to the printing surface of the sheet material P. .

The printing unit 30 includes a rotating drum 31 that is a supporting member (rotating body) that rotates while supporting the sheet material P on its peripheral surface, and a liquid droplet ejection device that ejects liquid toward the sheet material P supported by the rotating drum 31 . A portion 32 is provided.

The printing unit 30 also receives the sheet material P conveyed by the transfer drum 34 that receives the sheet material P fed from the preprocessing unit 20 and transfers the sheet material P between the rotating drum 31 and the rotating drum 31 . A delivery cylinder 35 is provided to deliver the material to the drying section 40.

The sheet material P transported from the preprocessing unit 20 to the printing unit 30 is gripped at its leading end by gripping means (sheet gripper) provided on the transfer cylinder 34 and transported as the transfer cylinder 34 rotates. The sheet material P conveyed by the transfer drum 34 is transferred to the rotating drum 31 at a position facing the rotating drum 31 .

Gripping means (sheet gripper) is also provided on the surface of the rotating drum 31, and the tip of the sheet material P is gripped by the gripping means (sheet gripper). A plurality of suction holes are dispersedly formed on the surface of the rotating drum 31 , and suction means generates an inward suction airflow from the required suction holes of the rotating drum 31 .

The sheet material P transferred from the transfer drum 34 to the rotary drum 31 is gripped by the sheet gripper at its leading end and is held by suction on the rotary drum 31 by the air current sucked by the suction means. transported with it.

The droplet ejection section 32 includes four droplet ejection units 33 (33A to 33D) that eject droplets. These droplet discharge units 33 (33A to 33D) are arranged along the upper outer periphery of the rotating drum 31 at regular intervals and symmetrically in FIG.

The droplet discharge unit 33A discharges cyan (C) liquid, the droplet discharge unit 33B discharges magenta (M) liquid, the droplet discharge unit 33C discharges yellow (Y) liquid, and the droplet discharge unit 33D discharges black ( K) liquids can be discharged respectively. In addition, a droplet discharge unit that discharges special liquid such as white or gold (silver) can also be used.

Each droplet ejection unit 33 of the droplet ejection section 32 is controlled in ejection operation by a drive signal corresponding to print information. The drive signal is generated by a substrate member 210 arranged in an electrical box 200, which will be described later. When the sheet material P carried by the rotating drum 31 passes through the area facing the droplet ejection section 32, the liquid of each color is ejected from the ejection unit 33, and an image corresponding to the print information is printed.

The sheet material P to which the liquid has been applied by the droplet ejection unit 32 is transferred from the rotary drum 31 to the transfer drum 35, and the sheet material P received by the transfer drum 35 is transferred to the conveying mechanism unit 41, where it is transferred to the drying unit (heating unit ) 40.

The drying section 40 dries the liquid adhered to the sheet material P in the printing section 30 . As a result, the liquid such as water in the liquid evaporates, the coloring agent contained in the liquid is fixed on the sheet material P, and curling of the sheet material P is suppressed.

The reversing mechanism unit 60 is a mechanism for reversing the sheet material P by a switchback method when double-sided printing is performed on the sheet material P that has passed through the drying unit 40 . The reversed sheet material P is conveyed upstream of the transfer cylinder 34 through the conveying path 61 of the printing unit 30 .

The carry-out section 50 includes a carry-out tray 51 on which a plurality of sheet materials P are stacked and a sheet conveying device 502 . The sheet materials P conveyed through the reversing mechanism section 60 are sequentially stacked and held on the stack section 501 .

(Droplet ejection unit)
Next, the droplet ejection unit 33 will be described. 2 is a plan view of the droplet ejection unit 33 viewed from the nozzle surface side, FIG. 3 is a plan view of the droplet ejection unit 33 viewed from the side opposite to the nozzle surface, and FIG. 4 corresponds to line AA in FIG. 3 is a cross-sectional view of a liquid droplet ejection unit 33. FIG. The droplet ejection unit 33 has a plurality of heads 100 for ejecting liquid arranged in a staggered manner on a head mounting member 302 . One of the rows of staggered heads 100 is called a head row 100A, and the other row is called a head row 100B. The present invention can also be applied to the case where the head mounting member 302 is provided with one row of heads instead of the zigzag pattern.

The head 100 has a plurality of nozzle rows (two rows are used as an example here, but the present invention is not limited to this) in which a plurality of nozzles 104 that eject liquid are arranged. The head 100 also has a flange portion 110 facing the base member 303 (303A, 303B) constituting the head mounting member 302 in the perpendicular direction (the Z direction in FIG. 3). The head 100 is attached to the base member 303 by being inserted into the opening 304 of the base member 303 .

Next, the head mounting member 302 will be described with reference to FIGS. 5 to 8. FIG. 5 is a plan view of the head mounting member 302, FIG. 6 is a sectional view along line AA of FIG. 5, FIG. 7 is a front view, and FIG. It is a diagram.

The head mounting member 302 has two base members 303 (303A, 303B) formed with an opening 304 into which the head 100 is inserted. The base members 303A, 303B are formed of two plate materials, fixed to the intermediate side plates 306 (306a, 306b), and fixed to the side plates 305 (305a, 305b) outside the intermediate side plates 306 (306a, 306b). . The head mounting member 302 is arranged such that the mounting surfaces 331 (331a, 331b) of the base members 303A and 303B are parallel to the tangential direction of the rotary drum 31, as shown in FIG.

( Electrical box)
As shown in FIG. 9A, four electrical equipment boxes 200 are arranged along the upper outer circumference of the rotating drum 31 . These four electrical equipment boxes 200 are radially arranged with the center of the rotating drum as a reference, and are arranged at equal intervals in the circumferential direction of the rotating drum and bilaterally symmetrically. An extension line of the center line of each electrical equipment box 200 is arranged so as to pass through the rotation center of the rotary drum 31 .

The four electrical boxes 200 are arranged corresponding to the four droplet ejection units 33A to 33D in FIG. That is, a substrate member 210, which will be described later, in the electrical equipment box 200 generates a drive signal corresponding to the print information for each color of C, M, Y, and K, and the drive signal causes the four droplet discharge units 33A to 33D to discharge the respective droplets. Movement is controlled.

Each electrical box 200 can be configured in a box shape like the conventional electrical box 200 of FIG. 12C. Inside the electrical equipment box 200, as shown in FIG. 9B, a plurality of substrate members 210, a plurality of heat conducting members 220, and a cooling member (heat sink) 230 are accommodated.

A drive circuit that generates and outputs a drive signal is mounted on the substrate member 210 . Specifically, the substrate member 210 is mounted with a plurality of electronic components e that constitute a drive circuit. The electronic parts e may include parts forming discrete circuits and semiconductor integrated circuits such as driver ICs.

At least part of the electronic component e may be mounted on a member other than the substrate member 210 . Each substrate member 210 is connected to each ink ejection head of the droplet ejection units 33A to 33D via cable wiring (not shown).

A plurality of substrate members 210 are arranged at equal intervals as shown in FIG. 12C. This board member 210 is inserted and attached to the electrical equipment box 200 from above in the direction of arrow S in FIG. 9B. The direction of the surface of the substrate member 210 is perpendicular to the axis of the rotating drum 31 , and the substrate member 210 is inserted and mounted in the center direction of the rotating drum 31 .

The substrate member 210 integrally has a heat radiating member 211 on one side edge thereof. The heat radiating member 211 can have a large number of heat radiating fins made of metal such as aluminum, iron, copper, etc., which have good heat transfer properties, in order to promote heat dissipation. The heat conducting member 220 and the cooling member 230 are arranged so as to face the heat radiating member 211 .

The heat-conducting member 220 can be made of, for example, a non-silicone heat-dissipating sheet having elasticity. Even if the surface precision of the heat radiating member 211 and the cooling member 230 is not high, the elasticity of the heat conducting member 220 can maintain good contact and heat transfer between them.

As shown in detail in FIGS. 9A and 9B, the heat conducting member 220 and the cooling member 230 are disposed on one side of the electrical box 200, that is, on one side of the electrical box 200 in the circumferential direction of the rotary drum 31 in the inclined direction. In this embodiment, the fixing bolts 231 are not used as in the conventional case, but the weight of the substrate member 210 including the heat radiating member 211 (self weight) is used to press the heat radiating member 211 against the heat conducting member 220 . Since the fixing bolt 231 is not used, it is possible to reduce the number of parts and the number of assembly steps. Moreover, since screw holes are not required, it is possible to increase the heat transfer area and improve the heat dissipation.

The shape of the heat radiating member 211 and the cooling member 230 seen from the axial direction of the rotating drum 31 is tapered as shown in FIG. 9B. That is, the heat radiation member 211 has a tapered shape that tapers in the insertion direction S of the substrate member 210 . On the other hand, the shape of the cooling member 230 is a tapered shape that tapers on the side opposite to the insertion direction S. As shown in FIG.

The heat conducting member 220 is lined on the inner surface of the tapered cooling member 230 . 9B in the electrical box 200 excluding the substrate member 210 is widest on the insertion entrance side of the substrate member 210, narrows on the insertion depth side, and reaches the end (bottom portion) in the insertion direction S. The left and right width is the narrowest at .

Accordingly, the substrate member 210 including the heat dissipation member 211 can be easily inserted into the electrical equipment box 200 from the S direction. When the substrate member 210 is arranged in an inclined state as shown in FIG. 9A, the substrate member 210 is pressed against the cooling member 230 via the heat conducting member 220 by its own gravity F.

Therefore, even if the thermally conductive member 220 undergoes compressive plastic deformation over time, no gap is formed between the heat radiating member 211 of the substrate member 210 and the thermally conductive member 220 . Accordingly, good heat dissipation of the substrate member 210 can be maintained for a long period of time.

(Force acting on the board member)
10A illustrates the self-gravity F acting on the center of gravity of the substrate member 210 and the elastic force N of the heat conducting member 220. FIG. The self-gravity F can be vector-decomposed into a force Fa acting perpendicularly to the heat conducting member 220 and a force Fb in the direction toward the center of the rotating drum 31 . A is the taper angle of the heat radiating member.

As the taper angle A increases, Fa increases (A∝Fa). The taper angle A is set so that the force Fa is always larger than the elastic force N (Fa>N). As a result, the heat conducting member 220 can be maintained in a state of being constantly crushed by the force Fa.

Therefore, even if the heat conducting member 220 undergoes compressive plastic deformation over time, no gap is formed between the heat conducting member 211 and the heat conducting member 220, and the heat conducting member 220 is in contact with the cooling member. is maintained. As a result, good heat dissipation of the substrate member 210 can be maintained for a long period of time.

FIG. 10B shows a configuration in which the taper angles A and A' of the heat radiating member 211 are changed according to the arrangement angles (tilt angles θa and θb) of the electrical box 200. FIG. That is, the taper angle A of the heat radiating member 211 when the electrical equipment box 200 has an inclination angle θa with respect to the vertical line VL passing through the center O of the rotating drum 31 is the same as the taper angle A when the electrical equipment box 200 has an inclination angle θb with respect to the vertical line VL. It is smaller than the taper angle A' of the member 211 (A<A').

This is because the size of Fa changes depending on the arrangement angle of the electrical equipment box 200, so that the taper angle should be suitable for each arrangement angle. That is, regardless of the arrangement angle θ of the electrical equipment box 200 with respect to the vertical line VL, the aforementioned force relationship of Fa>N is maintained. Thereby, the installation stability of the substrate member 210 can be improved.

The position of the center of gravity of the substrate member 210 is desirably set at a position where the heat radiating member 211 makes the strongest rotational contact with the cooling member 230 via the heat conducting member 220 . As a result, the heat dissipation and installation stability of the substrate member 210 can be improved.

10C shows an embodiment in which a biasing member 240 is arranged inside the electrical equipment box 200. FIG. The biasing member 240 is disposed on the side of the substrate member 210 opposite to the cooling member 230 , and biases the substrate member 210 toward the cooling member 230 with the force of the biasing member 240 . By doing so, the heat dissipating member 211 can be brought into close contact with the cooling member 230 with a greater force obtained by adding the biasing force of the biasing member 240 to the force Fa (improving the ease of attachment of the substrate member 210).

In addition, it is possible to suppress displacement of the substrate member 210 due to vibration, impact, or the like (improvement of installation stability of the substrate member 210). This makes it possible to more reliably maintain good heat dissipation of the substrate member 210 over a long period of time. Further, the grounding property of the substrate member 210 can be ensured by configuring the biasing member 240 with a metal spring, conductive rubber, or the like.

The biasing force and position of the biasing member 240 can be changed according to the arrangement angle θ of the electrical equipment box 200 and the like. Thereby, the installation stability of the substrate member 210 can be improved.

(● modified embodiment)
11(a) and 11(b) are diagrams showing a modified embodiment of the present invention. That is, although the above-described embodiment has the heat radiating member 211 and the heat conducting member 220, the modified embodiment of FIG. 11A omits the heat radiating member 211, and the modified embodiment of FIG. 220 is omitted. As shown in FIG. 11A, the present invention can be applied to a substrate member 210 in which the heat dissipation member 211 is omitted as long as a predetermined heat dissipation property can be obtained. Moreover, even when the substrate member 210 is brought into direct contact with the cooling member 230 by omitting the heat conducting member 220 as shown in FIG.

In the present application, the liquid ejected from the droplet ejection unit 33 is not particularly limited as long as it has a viscosity and surface tension that can be ejected from the head. It is preferable that the viscosity is 30 mPa·s or less. More specifically, solvents such as water and organic solvents, colorants such as dyes and pigments, functional-imparting materials such as polymerizable compounds, resins, and surfactants, biocompatible materials such as DNA, amino acids, proteins, and calcium. , edible materials such as natural pigments, solutions, suspensions, emulsions, etc. These are, for example, inkjet inks, surface treatment liquids, components of electronic elements and light emitting elements, and formation of electronic circuit resist patterns It can be used for applications such as liquids for liquids and material liquids for three-dimensional modeling.

Piezoelectric actuators (laminated piezoelectric element and thin film piezoelectric element), thermal actuators that use electrothermal conversion elements such as heating resistors, and electrostatic actuators that consist of a diaphragm and a counter electrode are used as energy sources for liquid ejection. includes those that In addition, the term "apparatus for ejecting liquid" includes not only devices capable of ejecting liquid onto an object to which liquid can adhere, but also devices ejecting liquid into air or liquid. .

The "liquid ejecting device" can include means for feeding, transporting, and ejecting an object to which liquid can adhere, as well as a pre-processing device, a post-processing device, and the like. For example, as a "device that ejects liquid", an image forming device that ejects ink to form an image on paper, and powder is formed in layers to form a three-dimensional object (three-dimensional object). There is a three-dimensional modeling apparatus (three-dimensional modeling apparatus) that ejects a modeling liquid onto a formed powder layer.

Further, the "apparatus for ejecting liquid" is not limited to one that visualizes significant images such as characters and figures with the ejected liquid. For example, it includes those that form patterns that have no meaning per se, and those that form three-dimensional images.

The aforementioned "substance to which a liquid can adhere" means a substance to which a liquid can adhere at least temporarily, such as a substance to which a liquid adheres and adheres, a substance which adheres and permeates, and the like. Specific examples include media such as recording media such as paper, recording paper, recording paper, film, and cloth, electronic components such as electronic substrates and piezoelectric elements, powder layers (powder layers), organ models, and test cells. Yes, and unless otherwise specified, includes anything that has liquid on it. The material of the above-mentioned "thing to which a liquid can adhere" may be paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, ceramics, etc., as long as the liquid can adhere even temporarily.

Further, the ``device for ejecting liquid'' is a device in which a droplet ejection head and an object to which liquid can be adhered move relative to each other, but it is not limited to this. Specific examples include a serial type device in which the droplet ejection head is moved and a line type device in which the droplet ejection head is not moved. In addition, the "apparatus for ejecting liquid" also includes a treatment liquid coating device that ejects a treatment liquid onto the paper for the purpose of modifying the surface of the paper. There is an injection granulator that granulates fine particles of the raw material by injecting a composition liquid in which raw materials are dispersed in a solution through a nozzle. The terms used in the present application, such as image formation, recording, printing, copying, printing, and molding, are synonymous.

1: Inkjet recording device (device that ejects liquid)
10: Carry-in unit 11: Carry-in tray 11A: Lower carry-in tray 1B: Upper carry-in tray 12 (12A, 12B): Feeding device 20: Pretreatment unit 21: Coating unit 30: Printing unit 31: Rotating drum 32: Droplet ejection Part 33 (33A to 33D: Droplet discharge unit 34: Transfer drum 35: Transfer drum 40: Drying part (heating part)
41: Conveyance mechanism section 50: Unloading section 51: Unloading tray 60: Reversing mechanism section 61: Conveyance path 100: Heads 100A and 100B: Head row 104: Nozzle 110: Collar 200: Electrical box 210: Board member 211: Heat dissipation member 220: Heat conducting member 230: Cooling member 231: Fixing bolt 240: Biasing member 302: Head mounting member 303: Base member 303 (303A, 303B): Base member 304: Opening 305 (305a, 305b): Side plate 306 ( 306a, 306b): Intermediate side plate 331 (331a, 331b): Mounting surface 501: Stack section 502: Sheet conveying device P: Sheet material (recording medium) S: Insertion direction e: Electronic component

JP 2014-51015 A

Claims (8)

An electrical equipment box installed in a plurality of droplet ejection units of a device for ejecting a liquid that conveys a recording medium with a rotating drum, the electrical equipment box having a substrate member and a cooling member, and on the outer periphery of the upper part of the rotating drum. In the electrical boxes arranged radially,
The cooling member is disposed on one side of the electrical equipment box in the inclined direction in the circumferential direction of the rotating drum,
The electrical equipment box, wherein the substrate member is arranged so as to be insertable from the upper portion of the electrical equipment box toward the center of the rotary drum, and abuts against the cooling member due to the weight of the substrate member. 2. The electrical box according to claim 1, wherein a heat radiating member attached to said substrate member contacts said cooling member via a heat conducting member. The heat dissipating member and the cooling member have a tapered shape when viewed from the axial direction of the rotating drum, and the heat dissipating member has a tapered shape that tapers in a direction in which the substrate member is inserted into the electrical box. 3. The electrical equipment box according to claim 2, wherein the member has a tapered shape that tapers in a direction opposite to the insertion direction of the board member into the electrical equipment box. 4. The electrical equipment box according to claim 3, wherein the angles of the tapered shapes of the heat radiating member and the cooling member are changed according to the inclination angle of the electrical equipment box. 5. The electrical box according to any one of claims 1 to 4, wherein a biasing member is provided in the electrical box, and the substrate member is biased toward the cooling member by the biasing member. . 6. The electric equipment box according to claim 5, wherein the position or the biasing force of said biasing member is changed according to the inclination angle of said electric equipment box. 7. The electrical box according to any one of claims 1 to 6, wherein the center of gravity of the substrate member is set at a position where the substrate member abuts the cooling member most strongly. An apparatus for ejecting liquid, such as an ink jet recording apparatus, comprising the electrical box according to any one of claims 1 to 7.

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