JP2011161790A - Recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording apparatus capable of effectively decreasing noise generated in the recording apparatus in the recording apparatus. <P>SOLUTION: The recording apparatus 11 includes: communicating holes 30 for making the inside communicate with the outside of a body case 16; and an annularly projected leg 27 so as to surround the communicating holes 30 at the outer face side of the body case 16 in the body case 16 in which a source of the noise generating the noise when recording is applied on recording paper P is stored inside. By making an annular leading edge of the leg 27 abut on a placing face IS, a resonance space communicating with the inside of the body case 16 through the communicating holes 30 is formed by being surrounded by the placing face IS, the leg 27 and the outer face of the body case 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a recording apparatus.

  2. Description of the Related Art Conventionally, as a recording apparatus that performs recording processing such as printing on a recording medium, for example, an ink jet recording apparatus that ejects ink onto recording paper (recording medium) is widely known. In such a recording apparatus, for example, since a recording paper transport mechanism, a recording mechanism, and the like emit noise during operation, a recording apparatus in which various noise suppression measures have been taken recently has been proposed (for example, Patent Document 1).

  In the recording apparatus of Patent Document 1, a vent is formed in the bottom wall of a main body case in which a noise source such as a transport mechanism is accommodated, and the vent is surrounded on the outer surface of the bottom wall of the main body case. An annular sound-absorbing material sheet is provided. Further, a sound insulation wall having a larger ring shape than the sound absorbing material sheet is formed on the outer peripheral side of the sound absorbing material sheet on the outer surface side of the bottom wall of the main body case so as to surround the sound absorbing material sheet.

  That is, in the recording apparatus of Patent Document 1, when the main body case is installed on an installation surface such as a table, the lower end edge of the sound absorbing material sheet and the lower end edge of the sound insulation wall are in close contact with the installation surface. become. Then, on the inner peripheral side of the sound absorbing material sheet on the outer surface side of the bottom wall of the main body case (that is, outside the main body case), a case outer space portion that emits noise from inside the main body case through the vent is surrounded and formed. At the same time, an annular sealed space is formed between the sound absorbing material sheet and the sound insulating wall on the outer surface side of the bottom wall of the main body case. For this reason, in the recording apparatus of Patent Document 1, even if noise is emitted from the inside of the main body case to the space outside the case, the space outside the case is triple surrounded by the sound absorbing material sheet, the sealed space, and the sound insulation wall. The leakage of noise from the outer space portion of the case to the outer space (in the atmosphere) outside the sound insulation wall is suppressed.

JP 7-47749 A

  By the way, in the silent structure in the recording apparatus of Patent Document 1, after the noise is released from the inside of the main body case to the outer space of the case formed outside the main body case and surrounded by the inner periphery of the sound absorbing material sheet, the noise is reduced. Has a structure that suppresses leakage from the space outside the case to the external space (in the atmosphere) outside the sound insulation wall. That is, the silent structure in the recording apparatus of Patent Document 1 is intended to reduce noise after being released from the inside of the recording apparatus to the outside of the recording apparatus, and the noise generated inside the recording apparatus is reduced inside the recording apparatus. However, it was not possible to effectively reduce the thickness.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a recording apparatus capable of effectively reducing noise generated inside the recording apparatus inside the recording apparatus. It is in.

  In order to achieve the above object, a recording apparatus of the present invention has a communication hole that communicates the inside and the outside of a main body case with a main body case that contains a noise source that generates noise when recording is performed on a recording medium. And an annular convex portion projecting annularly so as to surround the communication hole on the outer surface side of the main body case, and by bringing the annular tip edge of the annular convex portion into contact with another member, A resonance space communicating with the inside of the main body case through the communication hole is surrounded by the other member, the annular convex portion, and the outer surface of the main body case.

  According to this configuration, noise generated inside the main body case containing the noise source can be reduced by the resonance space formed on the outer surface side of the main body case that communicates with the inside of the main body case through the communication hole. it can. Therefore, noise near a specific frequency generated inside the recording apparatus can be effectively reduced inside the recording apparatus.

  In the recording apparatus of the present invention, the communication hole is formed in a bottom wall portion of the main body case, and the annular front end edge of the annular convex portion is mounted on the recording apparatus on the other member. When placed on the surface, it comes into contact with the placement surface.

  According to this configuration, the resonance space can be formed between the recording device and the mounting surface by mounting the main body case of the recording device on the mounting surface. Therefore, noise around a specific frequency generated inside the recording apparatus can be effectively reduced by the formed resonance space.

  Further, the recording apparatus of the present invention includes a support member having a support surface capable of supporting the recording medium in the middle of being conveyed from the inside of the main body case to the outside of the main body case, above the communication hole in the main body case. The support member is formed with a through hole that opens to the surface on the communication hole side and the support surface.

  According to this configuration, when the recording medium slides on the support surface of the support member, noise generated on the support surface is guided to the opening side of the communication hole by the through hole. Diffusion of generated noise can be suppressed.

In addition, the recording apparatus of the present invention further includes a connecting pipe that connects the communication hole formed in the main body case and the through hole formed in the support member.
According to this configuration, the noise generated by the support member can be guided to the resonance space formed on the outer surface side of the recording apparatus, so that noise can be effectively suppressed by suppressing noise diffusion. it can.

In the recording apparatus of the present invention, the annular convex portion is made of a foam material having a closed cell structure.
According to this configuration, since the annular convex member has high sound insulation, it is possible to suppress diffusion of noise from the resonance space to the external space (in the atmosphere).

In the recording apparatus of the present invention, a foam material having an open cell structure is attached to either the inner surface side or the outer surface side of the main body case so as to cover the communication hole.
According to this configuration, when the noise generated in the recording apparatus passes through the communication hole, the noise in the entire frequency region is absorbed by the foam having an open cell structure. Therefore, noise other than near the specific frequency can be effectively reduced.

1 is a perspective view of a recording apparatus according to an embodiment. 1 is a schematic front sectional view of a recording apparatus. FIG. 3 is an exploded perspective view of a platen and a bottom wall portion of the recording apparatus. FIG. 3 is an explanatory diagram showing noise movement in the recording apparatus.

  Hereinafter, an embodiment in which the present invention is embodied in an ink jet recording apparatus which is a kind of recording apparatus will be described with reference to FIGS. 1 and 2. The ink jet recording apparatus (hereinafter abbreviated as “recording apparatus”) 11 of the present embodiment reads a printing process (recording process) and an image (document contents such as text and graphics) described in the document, respectively. This is a multifunction machine capable of executing an image reading process for generating electronic data in a format corresponding to the image.

  As shown in FIG. 1, the recording apparatus 11 includes a printer unit 12 that performs a printing process at a lower portion thereof, and a scanner unit 13 as an image reading unit that performs an image reading process at an upper portion thereof. The printer unit 12 has a bottomed substantially box-shaped lower case 14 made of a resin material, while the scanner unit 13 has a bottomed substantially box-shaped upper case made of a resin material whose vertical dimension is smaller than that of the lower case 14. 15. On the upper surface of the upper case 15, there is provided a document table 15a in which a square plate-like transparent glass is incorporated, and a cover 15b that covers the document table 15a. Then, the upper case 15 is stacked on the upper side of the lower case 14, whereby the main body case 16 that defines the outer shape of the recording device 11 is configured.

  An automatic paper feeding mechanism 17 having a support 17a on which recording paper P as a recording medium is set in a stacked state is provided on the rear surface (right surface in FIG. 2) of the main body case 16 in the recording apparatus 11. On the front side of the main body case 16, an operation panel 18 is provided at the upper portion thereof, and at the lower portion thereof, a paper discharge section 19a capable of supporting the recording paper P discharged from the main body case 16 to the outside of the main body case 16. A paper discharge port 19 having an opening is opened.

  As shown in FIG. 2, the lower case 14 includes a bottom wall portion 20 that forms a bottom wall of the lower case 14 and a side wall portion 21 that forms a side wall. On the upper surface 20a of the bottom wall portion 20, a platen 22 is provided as a support member having a support surface 22a that supports the recording paper P conveyed for recording from below. On the support surface 22a of the platen 22, an upstream roller 23a provided at a position upstream of the platen 22 in the conveyance direction of the recording paper P is rotated based on driving of a paper feed motor (not shown), thereby recording. The sheets P are fed one by one from the rear side through a sheet feeding port (not shown). Then, the recording paper P fed onto the support surface 22a of the platen 22 by the rotation of the upstream roller 23a is rotated by the downstream roller 23b provided downstream of the platen 22 in the conveyance direction of the recording paper P. As a result, the paper is conveyed forward and discharged from the paper discharge port 19 to the outside of the recording apparatus 11.

  Further, a guide shaft 24 extending in the left-right direction perpendicular to the conveyance direction of the recording paper P is installed above the platen 22. A carriage 25 is supported on the guide shaft 24 so as to be capable of reciprocating along the axial direction of the guide shaft 24. The carriage 25 is reciprocated along the axial direction of the guide shaft 24 by a drive mechanism (not shown) constituted by, for example, a drive motor and a drive belt. A recording head 26 that ejects ink toward the recording paper P is provided on the lower surface of the carriage 25.

  Further, in order to place the recording apparatus 11 on the placement surface IS formed by the upper surface of the other member T such as a desk, the bottom wall portion 20 b of the bottom wall portion 20 has a closed cell structure along the outer edge of the bottom surface 20 b. A leg portion 27 as a ring-shaped annular convex portion made of a material protrudes in a direction intersecting the bottom surface 20b. When the recording device 11 is placed on the placement surface IS, the lower end edge of the leg portion 27 that is annular with respect to the placement surface IS is in close contact, and therefore, the space between the bottom surface 20b and the placement surface IS. The space is sealed from the outside by the legs 27. That is, the independent case outer space portion 28 is formed by the bottom surface 20 b, the mounting surface IS, and the leg portion 27.

  Further, as shown in FIG. 2, an area where the platen 22 is arranged in the bottom wall portion 20 includes an accommodation space portion 29 that is inside the printer portion 12 and an outside of the case that is formed outside the printer portion 12. A plurality of communication holes 30 (three are shown in FIG. 2) having a circular cross section communicating with the space portion 28 are regularly arranged. That is, the communication hole 30 is formed in the bottom wall portion 20 so that the upper surface 20a side that is the accommodation space portion 29 side and the bottom surface 20b that is the case outer space portion 28 side are opened. Each communication hole 30 has a function of reducing noise in a specific frequency region by a resonance phenomenon in which the outer space portion 28 is a resonance space.

  That is, in the present embodiment, the sliding sound (paper feeding) is caused by sliding the carriage 25 that generates sliding sound when reciprocating along the guide shaft 24 or the recording paper P being conveyed to the support surface 22a. The platen 22 that generates sound) is used as a noise source. The communication hole 30 and the case outer space portion 28 form a resonator using the case outer space portion 28 as a back air layer so that noise near a specific frequency generated in the housing space portion 29 is reduced. It has become. Note that the opening diameters of the plurality of communication holes 30 formed in the bottom wall portion 20 are all equal. And the shape of the communication hole 30 is calculated by the following formula based on the specific frequency of the noise to be reduced.

f = (c / 2π) √S / V · L
Here, f is the frequency of the noise to be reduced, c is the speed of sound, S is the opening cross-sectional area of each communication hole 30, V is the volume of the air layer behind the communication hole 30 (outer case space portion 28), and L is the bottom. It is the thickness of the wall part 20. For example, in the present embodiment, the shape of the communication hole 30 is calculated based on the frequency of the sliding sound of the recording paper P generated with the conveyance of the recording paper P, which is the noise to be reduced.

  Further, the opening on the side of the space outside the case 28 of the communication hole 30 in the bottom wall portion 20 is made of a foam material having an open cell structure such as a fiber system such as glass wool or polyurethane foam, and absorbs noise in the entire frequency range. 31 is covered. The sound absorbing material 31 corresponds to the size of the region where the communication hole 30 is formed in the bottom wall portion 20, and covers the openings of all the communication holes 30 when placed on the region. It has become.

Next, the structure of the platen 22 will be described below with reference to FIG.
As shown in FIG. 3, a plurality of through holes 32 penetrating the platen 22 in the thickness direction are formed at positions corresponding to the communication holes 30 formed in the bottom wall portion 20 in the platen 22. In other words, the through holes 32 are formed so as to open on the lower surface side of the platen 22 that faces the support surface 22 a and the upper surface 20 a of the bottom wall portion 20. In addition, the opening diameter of each through-hole 32 is equal on the support surface 22 a side and the lower surface side, and is equal to the opening diameter of each corresponding communication hole 30.

  A plurality of connecting pipes 33 are provided between the platen 22 and the top surface 20 a of the bottom wall portion 20 to connect the communication holes 30 and the through holes 32 corresponding to the communication holes 30. That is, each of the connecting pipes 33 having a hollow interior is connected to the opening of the through hole 32 formed on the lower surface side of the platen 22 and the other end is the upper surface of the bottom wall portion of the communication hole 30. It connects with the opening of the communicating hole 30 corresponding to each through-hole 32 formed in 20a. The cross-sectional area of each connecting pipe 33 is configured to be the same as the opening cross-sectional area of the through hole 32 corresponding to each communication hole and each communication hole 30.

Next, the action of the recording apparatus 11 configured as described above, particularly the action when suppressing noise generated inside the recording apparatus 11 will be described with reference to FIG.
For example, when printing is started in the printer unit 12 inside the main body case 16, the automatic paper feeding mechanism 17 is driven to feed the recording paper P from the support 17a, and the recording paper P sent from the support 17a. Is conveyed to a printing position on the platen 22 as the upstream roller 23a rotates. At this time, in the housing space 29 that is the internal space of the printer unit 12, noise such as driving sound of a paper feed motor (not shown) and sliding noise due to the recording paper P slidingly contacting the support surface 22 a of the platen 22 is generated. . Next, printing is performed on the recording paper P conveyed to the printing position on the platen 22 by ejecting ink while the carriage 25 reciprocates along the guide shaft 24. At this time, noise such as a driving sound of the carriage motor, a sliding contact sound between the recording paper P and the platen 22 and a sliding sound accompanying the movement of the carriage 25 is generated. When printing on the recording paper P is completed, the recording paper P is transported to the paper discharge port 19 and is discharged from the recording device 11 through the paper discharge port 19. At this time, in the printer unit 12, noise such as driving sound of a paper feed motor (not shown) and sliding sound of the recording paper P with respect to the platen 22 is generated.

  As described above, when the printing process is performed in the recording apparatus 11, various noises are generated in the accommodation space 29. The noise generated in the accommodation space 29 during the printing process propagates and diffuses in the accommodation space 29. At this time, particularly, the sliding sound generated when the recording paper P slides on the support surface 22 a of the platen 22 is guided into the through holes 32 by the plurality of through holes 32 formed in the platen 22. Therefore, noise diffusion from the platen 22 toward the paper discharge port 19 is suppressed.

  The noise induced in the through hole 32 of the platen 22 passes through the through hole 32 and the connecting pipe 33 connected to the through hole 32. When the noise reaches the communication hole 30 formed in the bottom wall portion 20 of the printer unit 12, the noise enters the communication hole 30 from the upper opening of the communication hole 30. In the communication hole 30, sound resonates in the communication hole 30 to generate friction, so that the air in the communication hole 30 vibrates violently. And the sound near a specific frequency is converted into thermal energy in the communication hole 30 and reduced.

  Then, after the noise having a frequency other than the vicinity of the specific frequency that has not been reduced by the communication hole 30 passes through the communication hole 30, the lower opening on the side of the space outside the case 28 of the communication hole 30 is covered. Sound absorption is performed by the sound absorbing material 31.

  Furthermore, noise that has not been reduced or absorbed by the communication hole 30 and the sound absorbing material 31 is emitted at various angles in the direction of the mounting surface IS facing the sound absorbing material 31 in the outer space 28 of the case. For example, noise emitted toward the leg portion 27 is reflected when it reaches the leg portion 27 having a low transmittance and travels toward the placement surface IS. Further, the noise emitted toward the placement surface IS is reflected and returned toward the sound absorbing material 31 when it reaches the placement surface IS. Then, since the reflected noise is absorbed again by the sound absorbing material 31, the noise is prevented from re-entering the printer unit 12. As described above, the noise emitted into the space 28 outside the case is gradually attenuated because the reflection to the bottom surface 20b, the leg portion 27, and the placement surface IS is repeated.

According to the above embodiment, the following effects can be obtained.
(1) In the recording apparatus 11 of the present embodiment, noise generated inside the printer unit 12 is communicated with the communication hole 30 formed in the main body case 16 and the inside of the main body case 16 through the communication hole 30. Noise near a specific frequency is reduced by the case outside space portion 28 formed on the outer surface side of the case 16. Therefore, the noise near the specific frequency generated inside the recording apparatus 11 can be effectively reduced inside the recording apparatus.

  (2) In the recording device 11 of the present embodiment, when the recording device 11 is placed on the placement surface IS of the other member T such as a table, the legs provided on the bottom surface 20b of the bottom wall portion 20 in the recording device 11 By the portion 27, a case-outside space portion 28 serving as a resonance space can be formed between the recording apparatus 11 and the mounting surface IS. Therefore, the noise near the specific frequency generated inside the recording apparatus 11 can be effectively reduced by the resonance space formed by the space part 28 outside the case.

  (3) In the recording apparatus 11 of the present embodiment, when the recording paper P slides on the support surface 22 a of the platen 22, noise generated on the support surface 22 a passes through the through hole 32 and the connecting pipe 33. The communication hole 30 is guided to the opening on the upper surface 20 a side. Therefore, it is possible to suppress diffusion of noise generated inside the recording apparatus 11, in particular, sliding sound generated by sliding contact when the recording paper P is conveyed on the platen 22 toward the paper discharge port 19. it can.

  (4) In the recording apparatus 11 of the present embodiment, noise diffused inside the case outer space portion 28 serving as a resonance space is reflected by the leg portion 27 having a high sound insulating property. Noise diffusion into the atmosphere can be suppressed.

  (5) In the recording apparatus 11 of the present embodiment, when noise generated inside the printer unit 12 passes through the communication hole 30 by the sound absorbing material 31 that covers the opening on the bottom surface 20 b side of the bottom wall 20 in the communication hole 30. The noise in the entire frequency range is absorbed. Therefore, noise other than near the specific frequency can be effectively reduced.

In addition, you may change the said embodiment as follows.
-You may form and form the communicating hole 30 of a different hole diameter. In this case, in the case outside space portion 28 serving as a resonance space, noise in a multi-frequency region can be reduced without being biased to sound of a specific frequency.

  In the bottom wall portion 20, the communication hole 30 is provided in a region corresponding to the lower portion of the platen 22, but the communication hole 30 is provided in a region other than the lower portion of the platen 22 as long as it is inside the region surrounded by the annular leg portion 27. It may be provided.

The sound absorbing material 31 may be provided in the opening on the upper surface 20 a side in the communication hole 30. Further, the sound absorbing material 31 may not be provided in the opening of the communication hole 30.
-The leg part 27 may be formed with materials (for example, hard rubber etc.) other than the foaming material of an independent foaming structure.

-The connection pipe 33 which connects each communicating hole 30 and each through-hole 32 does not need to be provided.
-It is not necessary to provide the through hole 32 in the platen 22.
The communication hole 30 and the leg part 27 surrounding the communication hole 30 may be provided in addition to the bottom wall part 20.

  In the above embodiment, the recording apparatus is embodied in the ink jet recording apparatus 11, but a recording apparatus that ejects or discharges liquid other than ink may be employed. The present invention can be used for various liquid ejecting apparatuses including a liquid ejecting head that ejects a minute amount of liquid droplets. The droplet means a state of the liquid ejected from the recording apparatus, and includes a liquid having a granular shape, a tear shape, or a thread shape. The liquid here may be any material that can be ejected by the recording apparatus. For example, it may be in a state in which the substance is in a liquid phase, such as a liquid with high or low viscosity, sol, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals (metal melts ) And a liquid as one state of a substance, as well as a material in which particles of a functional material made of a solid such as a pigment or metal particles are dissolved, dispersed or mixed in a solvent. Further, representative examples of the liquid include ink and liquid crystal as described in the above embodiment. Here, the ink includes general water-based inks and oil-based inks, and various liquid compositions such as gel inks and hot melt inks. As specific examples of the recording apparatus, for example, a liquid containing an electrode material or a color material used for manufacturing a liquid crystal display, an EL (electroluminescence) display, a surface emitting display, or a color filter is dispersed or dissolved. It may be a recording device that injects a bio-organic matter used in biochip manufacture, a recording device that is used as a precision pipette and injects a liquid as a sample, a textile printing device, a microdispenser, or the like. In addition, a transparent resin liquid such as ultraviolet curable resin is used to form a recording device that injects lubricating oil pinpointed into precision machines such as watches and cameras, and micro hemispherical lenses (optical lenses) used in optical communication elements. You may employ | adopt the recording apparatus which injects etching liquid, such as a recording device sprayed on a board | substrate, and an acid, an alkali, etc. in order to etch a board | substrate. The present invention can be applied to any one of these recording apparatuses.

  T ... other members, IS ... mounting surface, P ... recording paper as recording medium, 11 ... recording device, 12 ... printer unit, 14 ... lower case, 16 ... main body case, 20 ... bottom wall, 22 ... support member Platen, 22a ... supporting surface, 27 ... leg as an annular convex member, 28 ... space outside case as resonance space, 29 ... housing space, 30 ... communication hole, 31 ... foam having open cell structure As a sound absorbing material, 32 ... through-hole, 33 ... connecting pipe.

Claims (6)

A communication hole that communicates the inside and the outside of the main body case with a main body case that houses a noise source that generates noise when recording on a recording medium;
An annular protrusion projecting in an annular shape so as to surround the communication hole on the outer surface side of the main body case;
With
By bringing the annular front edge of the annular convex portion into contact with the other member, the resonance space communicating with the inside of the main body case via the communication hole is formed between the other member, the annular convex portion, and the main body case. A recording apparatus characterized in that it is enclosed by an outer surface. The communication hole is formed in a bottom wall portion of the main body case, and the annular front end edge of the annular convex portion is formed when the main body case is placed on the placement surface of the recording device in the other member. The recording apparatus according to claim 1, wherein the recording apparatus abuts on the mounting surface. A support member having a support surface capable of supporting the recording medium being conveyed from the inside of the main body case to the outside of the main body case is disposed at a position above the communication hole in the main body case. The recording apparatus according to claim 2, wherein a through hole is formed in the surface on the communication hole side and the support surface. The recording apparatus according to claim 3, further comprising a connecting pipe that connects the communication hole formed in the main body case and the through hole formed in the support member. The recording apparatus according to claim 1, wherein the annular convex portion is made of a foam material having a closed cell structure. The foam material having an open cell structure is attached to either the inner surface side or the outer surface side of the main body case so as to cover the opening of the communication hole. The recording device described in 1.

Images