JP2016013624A - Damper and ink jet recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper and an ink jet recording device capable of saving a space of an installation part.SOLUTION: A damper 10 has a body 12 which has a liquid chamber 14, an elastic film 18 which suppresses pressure fluctuation in the liquid chamber 14, an inlet portion 22 communicating to the liquid chamber 14, a plurality of outlet portions 24A and 24B communicating to the liquid chamber 14, and an opening/closing portion 26 which selectively opens/closes the plurality of outlet portions 24A and 24B. The opening/closing portions has a mast 34 equipped with a plurality of opening portions 40A, 40B, 40C, and 40D, rotates the mask 34 to change the opening portions 40A, 40B, 40C, and 40D, thereby selectively opening/closing the plurality of outlet portions 24A and 24B.

Description

  The present invention relates to a damper for suppressing pressure fluctuation of a liquid flowing in a flow path, and an ink jet recording apparatus in which the damper is incorporated in an ink flow path.

  In an ink jet recording apparatus, in order to correctly control ink ejection, it is necessary to stably supply ink to the head. Here, “stable” means suppressing pressure fluctuation as much as possible. As one of the techniques for suppressing the pressure fluctuation of the ink supplied to the head, a technique for suppressing the pressure fluctuation of the ink supplied to the head by installing a damper in the ink flow path is known.

  Incidentally, as a head used in an ink jet recording apparatus, a head configured by connecting a plurality of head modules is known. In this type of head, ink is generally supplied to each head module, and a damper and a valve are installed for each head module (for example, Patent Document 1).

JP 2012-116171 A

  However, when a damper and a valve are installed for each head module, a large space is required for installing the damper and the valve, and there is a disadvantage that the apparatus becomes large. In particular, a head that circulates and supplies ink requires a damper and a valve in each flow path on the supply side and the recovery side, which further increases the size of the apparatus.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a damper and an ink jet recording apparatus that can save space in a portion to be installed.

  Means for solving the problems are as follows.

  (1) A main body including a liquid chamber, an elastic film provided in the main body and suppressing pressure fluctuation in the liquid chamber, a first communication portion provided in the main body and communicating with the liquid chamber, and provided in the main body. A damper comprising: a plurality of second communication parts that communicate with each other; and an opening / closing part that is provided in the main body and that selectively opens and closes the second communication part.

  According to this aspect, a plurality of second communication portions are provided for one liquid chamber. Each second communication part is selectively opened and closed by an opening and closing part provided in the main body. As a result, the damper function and the opening / closing function of the plurality of flow paths can be integrated into one, and the space where the damper is installed can be saved.

  (2) The plurality of second communication portions open on the same surface of one of the surfaces constituting the liquid chamber, and the opening / closing portion has an axis orthogonal to the surface where the second communication portion opens. The damper as described in said (1) provided with the opening-and-closing member which rotates to a center and selectively opens and closes a 2nd communication part.

  According to this aspect, the plurality of second communication portions open on the same surface of the liquid chamber. The opening / closing part includes an opening / closing member that rotates about an axis orthogonal to the surface on which the second communication part is disposed, and the second communication part is selectively opened / closed by rotating the opening / closing member. Thereby, a plurality of 2nd communicating parts can be opened and closed easily.

  (3) The damper according to (2), wherein the opening / closing unit further includes a rotation driving unit that rotates the opening / closing member.

  According to this aspect, the rotation driving means for rotating the opening / closing member is provided. Thereby, a plurality of 2nd communicating parts can be opened and closed automatically.

  (4) The opening / closing member is composed of a plate-shaped mask having a plurality of openings, and is arranged so as to overlap the surface where the second communication portion opens, and rotates around the axis to position the opening at the second position. The damper according to (3), wherein the second communication portion is opened by adjusting the position of the communication portion, and the second communication portion is closed by shifting the position of the opening from the position of the second communication portion.

  According to this aspect, the opening / closing member is configured by a plate-like mask having a plurality of openings, and is disposed so as to overlap the surface on which the second communication part opens. The opening / closing member rotates about the axis, opens the second communication part by adjusting the position of the opening to the position of the second communication part, and shifts the position of the opening from the position of the second communication part. 2 Close the communication part. Thereby, it is possible to easily open and close the plurality of second communication portions with a simple configuration.

  (5) The damper according to (4), wherein the shaft is arranged at the center of the surface where the second communication portion opens.

  According to this aspect, the axis serving as the rotation center of the mask is arranged at the center of the surface where the second communication portion opens. Thereby, the mask which comprises an opening-and-closing member can be arrange | positioned in a compact main body.

  (6) The liquid chamber is provided in the main body as a cylindrical space, the second communication portion opens in a circular end surface of the liquid chamber, and the mask constituting the opening / closing member has a disk shape (5) ) Damper.

  According to this aspect, the liquid chamber is provided in the main body as a cylindrical space, and the second communication portion is provided to open on the circular end surface of the liquid chamber. Moreover, the mask which comprises an opening / closing member is formed in disk shape. Thereby, the mask which comprises an opening-and-closing member can be arrange | positioned in a compact main body.

  (7) The damper according to (6), wherein the diameter of the surface where the second communication portion opens and the diameter of the mask constituting the opening / closing member are the same size.

  According to this aspect, the diameter of the surface where the second communicating portion opens and the diameter of the mask constituting the opening / closing member are formed to have the same size. Thereby, the mask which comprises an opening-and-closing member can be arrange | positioned in a compact main body.

  Here, the “same size” includes “substantially the same size” in addition to the completely same one. That is, it means that the mask is accommodated in the liquid chamber with almost no gap.

  (8) The opening / closing member is composed of a rotating body disposed coaxially with the shaft and a valve body connected to the rotating body, and is disposed so as to overlap the surface where the second communication portion opens, with the shaft being the center The second communication part is closed by adjusting the position of the valve body to the position of the second communication part, and the second communication part is opened by shifting the position of the valve body from the position of the second communication part, The damper as described in (3).

  According to this aspect, the opening / closing member is composed of a rotating body arranged coaxially with the shaft, and a valve body connected to the rotating body. The opening / closing member rotates about the shaft, adjusts the position of the valve body to the position of the second communication part, closes the second communication part, and shifts the position of the valve body from the position of the second communication part. 2 Open the communication section. Thereby, it is possible to easily open and close the plurality of second communication portions with a simple configuration.

  (9) The damper according to (8), wherein the opening / closing member includes a plurality of valve bodies.

  According to this aspect, the opening / closing member includes a plurality of valve bodies.

  (10) The damper according to (8) or (9), wherein the shaft is disposed at a center of a surface where the second communication portion opens.

  According to this aspect, the axis serving as the rotation center of the rotating body is disposed at the center of the surface where the second communication portion opens. Thereby, an opening / closing member can be arrange | positioned in a compact main body.

  (11) The damper according to any one of (1) to (10), wherein the elastic film forms part of the wall surface of the liquid chamber.

  According to this aspect, the elastic film constitutes a part of the wall surface of the liquid chamber. Thereby, the structure of a damper can be made more compact.

  (12) The damper according to any one of (1) to (11), wherein the main body further includes an air chamber partitioned from the liquid chamber via an elastic membrane.

  According to this aspect, the air chamber partitioned from the liquid chamber and the elastic membrane is provided in the main body. Thereby, even when the elastic film is damaged, it is possible to prevent the liquid flowing through the damper from flowing out of the main body.

  (13) The damper according to (12), wherein the air chamber has a part of a wall surface configured by a gas-liquid separation membrane.

  According to this aspect, a part of the wall surface of the air chamber is configured by the gas-liquid separation membrane. Thereby, the fall of the transmission pressure to a downstream can be suppressed.

  (14) A plurality of head modules that include a transport unit that transports a medium, an ink supply port, and a nozzle, and that ejects ink supplied through the ink supply port from the nozzle toward the medium transported by the transport unit. And a tank for storing ink to be supplied to the head module, a damper composed of the damper described in any one of (1) to (13), and a common connecting tank and the first communication portion of the damper An individual supply flow path for individually connecting a supply flow path, a supply liquid supply section for supplying ink from the tank to the damper via the common supply flow path, and an ink supply port of the head module and the second communication section of the damper An inkjet recording apparatus.

  According to this aspect, ink is supplied to each head module via the damper having the damper function and the opening / closing function of the plurality of flow paths. As a result, it is not necessary to separately install a damper and a valve for each head module, and the ink supply system can be made compact, and thus the entire apparatus can be made compact.

  (15) The inkjet recording apparatus according to (14), further including a manifold including a plurality of dampers, and further including a manifold that branches and supplies the ink supplied from the common supply flow path to the dampers.

  According to this aspect, in the case of providing more head modules than the number of second communication parts provided in the damper, the liquid is supplied using a plurality of dampers (for example, the first module provided in the damper). When the number of the two communicating portions is 2 and the number of the head modules is 16, the liquid is supplied using eight dampers. At this time, liquid is supplied to each damper via the manifold.

  (16) The ink jet recording apparatus according to (14) or (15), wherein the head modules are connected in a line to constitute one head.

  According to this aspect, one head is configured by connecting the head modules in a line. A damper function and a channel opening / closing function can be provided with a smaller number of dampers than the number of head modules. The form in which the head modules are connected in a line includes the form in which the head modules are arranged in a staggered manner in addition to the form in which the head modules are arranged on the same straight line.

  (17) A transport unit that transports the medium, an ink supply port, an ink recovery port, and a nozzle, and is circulated and supplied to the media transported by the transport unit via the ink supply port and the ink recovery port. A plurality of head modules that discharge ink from the nozzles, a tank that stores ink that is circulated and supplied to the head modules, and a supply-side damper that includes the damper according to any one of (1) to (13); A common supply flow path connecting the recovery side damper configured by the damper according to any one of (1) to (13), a tank and a first communication portion of the supply side damper, and a common supply flow path. A supply liquid supply section for supplying ink from the tank to the supply side damper, an individual supply flow path for individually connecting the ink supply port of the head module and the second communication section of the supply side damper, and a head module. An individual recovery channel that individually connects the ink recovery port of the cartridge and the second communication part of the recovery side damper, a common recovery channel that connects the tank and the first communication part of the recovery side damper, and a common recovery channel An ink jet recording apparatus comprising: a recovery liquid feeding unit that feeds ink from the recovery side damper to the tank through the tank.

  According to this aspect, the ink is circulated and supplied to each head module via the supply-side damper and the recovery-side damper having a damper function and a plurality of flow path opening / closing functions. Thereby, it becomes unnecessary to install a damper and a valve individually for each head module, and space saving can be achieved.

  (18) A plurality of supply-side dampers and recovery-side dampers are provided, and a supply-side manifold that supplies the ink supplied from the common supply flow path to the supply-side damper and the ink recovered from the recovery-side damper are commonly recovered. The inkjet recording apparatus according to (17), further including a collection-side manifold that collects and collects in a flow path.

  According to this aspect, when more head modules are provided than the number of second communication parts provided in the supply side damper and the recovery side damper, the ink is circulated and supplied using a plurality of supply side dampers and recovery side dampers. Is done. At this time, ink is supplied to each supply side damper via the supply side manifold, and ink is recovered from each recovery side damper via the recovery side manifold.

  (19) The ink jet recording apparatus according to (17) or (18), wherein the head modules are connected in a line to constitute one head.

  According to this aspect, one head is configured by connecting the head modules in a line. A damper function and a plurality of flow path opening / closing functions can be provided with a smaller number of dampers than the number of head modules.

     According to the present invention, the space where the damper is installed can be saved, and the built-in apparatus can be made compact.

Front view showing the first embodiment of the damper 1 is a longitudinal sectional view of the damper shown in FIG. Cross-sectional view of the damper shown in FIG. 1 (3-3 cross-sectional view) Explanatory drawing of the effect | action of the damper of 1st Embodiment Explanatory drawing of the effect | action of the damper of 1st Embodiment Explanatory drawing of the effect | action of the damper of 1st Embodiment Explanatory drawing of the effect | action of the damper of 1st Embodiment Cross section showing a second embodiment of the damper Cross-sectional view showing a third embodiment of the damper Explanatory drawing of the effect | action of the damper of 3rd Embodiment Cross section showing a fourth embodiment of a damper Explanatory drawing of an effect | action of 4th Embodiment Explanatory drawing of an effect | action of 4th Embodiment Cross-sectional view showing a fifth embodiment of the damper Longitudinal sectional view showing a sixth embodiment of the damper Cross-sectional view showing a sixth embodiment of the damper Explanatory drawing of the effect | action of the damper of 6th Embodiment Explanatory drawing of the effect | action of the damper of 6th Embodiment Plan view showing another example of valve body Plan view showing another example of main body and liquid chamber Plan view showing another example of mask Plan view showing another example of main body and liquid chamber Schematic configuration diagram of inkjet printer A perspective view showing a schematic configuration of the head Top view of the nozzle surface of the head Enlarged view of the nozzle arrangement area provided in the head module Schematic configuration diagram of ink supply unit Block diagram showing system configuration of control system of inkjet printer Schematic configuration diagram showing another embodiment of the ink supply unit

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

"damper"
First, an embodiment of a damper according to the present invention will be described.

[First Embodiment of Damper]
<Constitution>
FIG. 1 is a front view showing a first embodiment of a damper according to the present invention. 2 is a longitudinal sectional view of the damper shown in FIG. 1, and FIG. 3 is a transverse sectional view (3-3 sectional view) of the damper shown in FIG.

  As shown in FIGS. 1 to 3, the damper 10 of the present embodiment mainly includes a main body 12 including a liquid chamber 14 and an air chamber 16, an elastic film 18 provided in the liquid chamber 14, and an air chamber 16. Gas-liquid separation membrane 20, one inlet 22 provided in the main body 12, two outlets 24 A and 24 B provided in the main body, and an opening and closing part 26 that selectively opens and closes the two outlets 24 A and 24 B , And is configured.

  The main body 12 includes a cylindrical outer peripheral wall surface portion 12A and end surface portions 12B and 12C that close both ends of the outer peripheral wall surface portion 12A, and has a hollow cylindrical shape with both ends closed as a whole. The end surface portions 12B and 12C at both ends have a disk shape and are provided orthogonal to an axis O passing through the center of the main body 12.

  The main body 12 includes a cylindrical partition 28 inside. The partition 28 is arranged coaxially with the axis O passing through the center of the main body 12. The interior of the main body 12 is partitioned into a liquid chamber 14 and an air chamber 16 by the partition 28.

  The liquid chamber 14 is disposed at the center of the main body 12 as a cylindrical space. In the liquid chamber 14, an inner peripheral wall surface 14 </ b> A is configured by a partition 28. The liquid chamber 14 has a ceiling surface 14B formed by a part (center portion) of the inner wall surface of the end surface portion 12B on one side of the main body 12, and a part (center portion) of the inner wall surface of the other end surface portion 12C. Constitutes the bottom surface 14C. The ceiling surface 14 </ b> B and the bottom surface 14 </ b> C are provided flat and are provided orthogonal to the axis O passing through the center of the main body 12. Therefore, the ceiling surface 14B and the bottom surface 14C of the liquid chamber 14 are provided to face each other.

  The air chamber 16 is disposed on the outer periphery of the liquid chamber 14 as an annular space. In the air chamber 16, an inner inner peripheral wall surface is configured by the partition 28, and an outer inner peripheral wall surface is configured by the outer peripheral wall surface portion 12 </ b> A of the main body 12. The air chamber 16 has a ceiling surface constituted by a part (peripheral part) of the inner wall surface of the end surface part 12B on one side of the main body 12, and a part (peripheral part) of the inner wall surface of the end surface part 12C on the other side. The bottom is configured.

  The elastic film 18 is provided in the partition 28. The partition 28 includes a plurality of elastic film installation portions 30. The elastic membrane installation part 30 is provided through the partition 28 as a circular opening. The elastic membrane 18 is attached to the partition 28 so as to close the elastic membrane installation portion 30. The elastic film 18 attached to the partition 28 constitutes a part of the inner circumferential wall surface 14 </ b> A of the liquid chamber 14 and constitutes a part of the inner circumferential wall surface inside the air chamber 16. That is, the liquid chamber 14 and the air chamber 16 are partitioned by the elastic film 18. The liquid stored in the liquid chamber 14 absorbs pressure fluctuations when the elastic film 18 is elastically deformed.

  The gas-liquid separation membrane 20 is provided on the outer peripheral wall surface portion 12 </ b> A of the main body 12. The outer peripheral wall surface portion 12 </ b> A of the main body 12 includes a plurality of gas-liquid separation membrane installation portions 32. Each gas-liquid separation membrane installation part is provided as a circular opening through the outer peripheral wall surface part 12A. The gas-liquid separation membrane 20 is attached to the outer peripheral wall surface portion 12 </ b> A of the main body 12 so as to close the gas-liquid separation membrane installation portion 32. The gas-liquid separation film 20 attached to the outer peripheral wall surface portion 12 </ b> A of the main body 12 constitutes a part of the inner peripheral wall surface outside the air chamber 16. The gas-liquid separation membrane 20 has a predetermined ventilation resistance, and the fluctuation of the elastic membrane 18 is suppressed by this ventilation resistance.

  The inlet portion 22 functions as a first communicating portion that communicates the outside of the main body 12 and the liquid chamber 14 inside the main body 12, and also functions as a connecting portion on the inlet side of the pipe that is connected to the damper 10. The inlet portion 22 is provided in the end surface portion 12B on one side of the main body 12 (the upper end surface portion 12B in FIG. 2). The inlet portion 22 has a cylindrical shape and is provided so as to protrude from the end surface portion 12 </ b> B toward the outside of the main body 12. The inlet 22 has an inner peripheral portion that opens to the ceiling surface 14 </ b> B of the liquid chamber 14 and communicates with the liquid chamber 14.

  The two outlet portions 24 </ b> A and 24 </ b> B function as a second communication portion that communicates the outside of the main body 12 with the liquid chamber 14 inside the main body 12, and also functions as a connection portion on the outlet side of the pipe connected to the damper 10. To do. The two outlet portions 24A and 24B are provided on the other end surface portion 12C of the main body 12 (the lower end surface portion 12C in FIG. 2). Each of the outlet portions 24A and 24B has a cylindrical shape, and is provided so as to protrude from the end surface portion 12C toward the outside of the main body 12. The outlet portions 24 </ b> A and 24 </ b> B are communicated with the liquid chamber 14 by opening the inner peripheral portion to the bottom surface 14 </ b> C of the liquid chamber 14 (opening on the same surface). Further, the two outlet portions 24 </ b> A and 24 </ b> B are arranged symmetrically with respect to an axis O passing through the center of the main body 12. More specifically, the other outlet portion 24B is arranged on the circumference of the radius R centered on the axis O and rotated 180 ° from the one outlet portion 24A.

  The opening / closing part 26 selectively opens and closes the two outlet parts 24A and 24B. In the following, for convenience, the outlet portion 24A is the first outlet portion, the other outlet portion 24B is the second outlet portion, and the two outlet portions 24A and 24B are distinguished as necessary.

  The opening / closing part 26 includes a plate-like mask 34 as an opening / closing member and a motor 36 as a rotation driving means. By rotating the mask 34 with the motor 36, the two outlet parts 24A, 24B are selectively selected. Open and close.

  The mask 34 has a disk shape and is accommodated in the liquid chamber 14. The mask 34 is disposed coaxially with an axis O passing through the center of the main body 12 (= an axis passing through the center of the liquid chamber 14), and is disposed so as to overlap the bottom surface 14 </ b> C of the liquid chamber 14.

  The mask 34 includes a seal member 38 on the outer peripheral portion. The gap between the mask 34 accommodated in the liquid chamber 14 and the inner peripheral wall surface 14 </ b> A of the liquid chamber 14 is sealed by the seal member 38.

  The mask 34 includes a plurality of openings 40A, 40B, 40C, and 40D (four openings in the present embodiment). In the following, for convenience, the opening 40A is the first opening, the opening 40B is the second opening, the opening 40C is the third opening, and the opening 40D is the fourth opening. The two openings 40A, 40B, 40C, and 40D are distinguished as necessary.

  Each opening 40A, 40B, 40C, 40D is provided as a circular hole through the mask 34. The mask 34 rotates about the axis O, thereby changing the positions of the openings 40A, 40B, 40C, and 40D and selectively opening and closing the two outlets 24A and 24B.

  Each opening 40A, 40B, 40C, 40D is arranged on the circumference of radius R centering on the center of mask 34. That is, it arrange | positions on the same periphery as the two exit parts 24A and 24B.

  Here, the first opening 40A and the fourth opening 40D are formed in the mask 34 as openings that simultaneously open the two outlets 24A and 24B, and the second opening 40B and the third opening. 40C is formed in the mask 34 as an opening that opens only one of the two outlets 24A and 24B.

  In the present embodiment, as shown in FIG. 3, the second opening 40B is formed at a position rotated 45 ° clockwise with respect to the first opening 40A, and the third opening is rotated 135 °. The opening 40C is formed. A fourth opening 40D is formed at a position rotated by 180 ° with respect to the first opening 40A. By forming the openings 40A, 40B, 40C, and 40D in this way, the two outlet portions 24A and 24B can be selectively opened and closed. That is, both the two outlet portions 24A and 24B can be opened, only one of the two outlet portions 24A and 24B can be opened, and both the two outlet portions 24A and 24B can be closed. The opening / closing mode will be described in detail later.

  The mask 34 includes a rotation shaft 42 at the center. The main body 12 includes an insertion hole 44 through which the rotary shaft 42 passes through the end surface portion 12C. The insertion hole 44 is disposed at the center of the end surface portion 12 </ b> C of the main body 12 and is formed through the inside and the outside of the main body 12. The rotating shaft 42 includes a seal member 46, and the seal member 46 seals the gap with the insertion hole 44.

  The motor 36 is attached to the end surface portion 12 </ b> C of the main body 12. The motor 36 is connected to the rotation shaft 42 and rotationally drives the rotation shaft 42.

<Action>
The damper 10 of the present embodiment configured as described above moves the positions of the four openings 40A, 40B, 40C, and 40D provided in the mask 34 by rotating the mask 34 with the motor 36. The two outlet portions 24A and 24B are selectively opened and closed.

  As described above, the two outlet portions 24A and 24B are disposed on the circumference of the radius R with the axis O as the center, and are disposed at positions 180 ° apart from each other. The openings 40A, 40B, 40C, and 40D provided in the mask 34 are also arranged on the circumference of the radius R with the axis O as the center. Therefore, when the mask 34 is rotated, each opening 40A, 40B, 40C, 40D moves on the circumference where the two outlets 24A, 24B are arranged.

  The second opening 40B is arranged at a position rotated 45 ° clockwise with respect to the first opening 40A, and the third opening 40C is clockwise with respect to the first opening 40A. Are arranged at a position rotated by 135 °. Further, the fourth opening 40D is arranged at a position rotated by 180 ° with respect to the first opening 40A.

  First, the case where both the two exit parts 24A and 24B are opened will be described. 4 (A) and 6 (A) are explanatory views of the operation of the damper, and show a state in which the two outlet portions 24A and 24B are both opened. As shown in the figure, in this case, the first opening 40A is positioned on the same axis as the first outlet 24A, and the fourth opening 40D is positioned on the same axis as the second outlet 24B. As a result, the two outlet portions 24 </ b> A and 24 </ b> B are both communicated with the liquid chamber 14. As a result, the liquid in the liquid chamber can flow out from the two outlet portions 24A and 24B.

  The position of the mask 34 when the two outlet portions 24A and 24B are both opened as described above is referred to as an “open / open position”.

  Next, the case where both the two exit parts 24A and 24B are closed will be described. FIG. 4B and FIG. 6B show a state in which the two outlet portions 24A and 24B are both closed. As shown in the figure, in this case, the openings 40A, 40B, 40C, and 40D are not positioned at any outlet. As a result, the two outlet portions 24A and 24B are both covered with the mask 34, and the two outlet portions 24A and 24B are both closed.

  To close the two outlet portions 24A, 24B together, for example, the mask 34 is rotated 90 ° counterclockwise from the “open / open position”. As a result, the two outlet portions 24 </ b> A and 24 </ b> B are both covered with the mask 34.

  The position of the mask 34 when the two outlet portions 24A and 24B are both closed as described above is referred to as a “closed / closed position”.

  Next, the case where the 1st exit part 24A is opened and the 2nd exit part 24B is closed is demonstrated. FIG. 5A and FIG. 7A are explanatory views of the operation of the damper, and show a state in which the first outlet portion 24A is opened and the second outlet portion 24B is closed. As shown in the figure, in this case, the second opening 40B is positioned on the same axis as the first outlet 24A. Thereby, the first outlet portion 24A is opened, and the second outlet portion 24B is covered with the mask 34 and closed. As a result, only the first outlet portion 24A communicates with the liquid chamber 14, and the liquid in the liquid chamber can flow out only from the first outlet portion 24A.

  To open only the first outlet 24A, for example, the mask 34 is rotated 45 ° counterclockwise from the “open / open position”. Alternatively, the mask 34 is rotated 45 ° clockwise from the “closed / closed position”. As a result, the second opening 40B is positioned on the same axis as the first outlet 24A, and only the first outlet 24A is opened.

  Note that the position of the mask 34 when only the first outlet 24A is opened as described above is referred to as an “open / closed position”.

  Next, a case where the first outlet portion 24A is closed and the second outlet portion 24B is opened will be described. 5B and 7B show a state in which the first outlet portion 24A is closed and the second outlet portion 24B is opened. As shown in the figure, in this case, the third opening 40C is positioned on the same axis as the second outlet 24B. As a result, the second outlet portion 24B is opened, and the first outlet portion 24A is covered with the mask and closed. As a result, only the second outlet portion 24B communicates with the liquid chamber 14, and the liquid in the liquid chamber can flow out only from the second outlet portion 24B.

  In order to open the second outlet portion 24B, for example, the mask 34 is rotated 45 ° clockwise from the “open / open position”. Alternatively, the mask 34 is rotated 45 ° counterclockwise from the “closed / closed position”. Alternatively, the mask 34 is rotated 90 ° clockwise from the “open / closed position”. As a result, the third opening 40C is positioned on the same axis as the second outlet 24B, and only the second outlet 24B is opened.

  Note that the position of the mask 34 when only the second outlet 24B is opened as described above is referred to as a “closed / open position”.

  As described above, the damper 10 of the present embodiment rotates the mask 34 to change the positions of the four openings 40A, 40B, 40C, and 40D provided in the mask 34, thereby changing the two outlet portions 24A. , 24B can be selectively opened and closed. Thereby, the opening / closing function of the flow channel that should originally be provided in each flow channel can be integrated into one. In addition, since the elastic chamber 18 is provided in the liquid chamber 14, a damper function can be provided. Thereby, the damper function which should originally be provided in each flow path can be integrated into one.

  Thus, according to the damper 10 of the present embodiment, the opening / closing function and the damper function of the flow path that should originally be provided in each flow path can be integrated into one. Thereby, space saving of the installation part of the damper 10 can be achieved.

  Further, according to the damper 10 of the present embodiment, since the gas-liquid separation film 20 is provided in the air chamber 16, fluctuations in the elastic film 18 can be suppressed. Further, even when the elastic film 18 is broken, the liquid can be prevented from leaking.

  Note that the function of suppressing the fluctuation of the elastic film 18 works particularly effectively when the damper 10 is incorporated into an ink jet recording apparatus. That is, in the ink jet recording apparatus, purging is performed as one maintenance. Purging is performed by pressurizing the ink in the head. However, if a damper is provided in the ink flow path, the pressure applied by the damper is absorbed, and the pressure cannot be efficiently transmitted to the head. There's a problem. However, as in the damper 10 of the present embodiment, by suppressing the fluctuation of the elastic film 18, it is possible to suppress a decrease in the transmission pressure to the downstream side of the damper and to pressurize the ink in the head efficiently.

[Second Embodiment of Damper]
FIG. 8 is a transverse sectional view showing a second embodiment of the damper according to the present invention (corresponding to a 3-3 section of the damper shown in FIG. 1).

  As shown in FIG. 8, the damper of the present embodiment is different from the damper of the first embodiment in the shape of the openings 40A, 40B, 40C, and 40D formed in the mask 34. Therefore, only this difference will be described here.

  As shown in FIG. 8, in the damper according to the present embodiment, openings 40A, 40B, 40C, and 40D are formed as notches (peripheries of the peripheral portions). More specifically, it is formed at the peripheral edge of the mask 34 as a U-shaped recess.

  As described above, the openings 40A, 40B, 40C, and 40D formed in the mask 34 only need to communicate with the outlets 24A and 24B and the liquid chamber 14, and the shape is not particularly limited.

[Third embodiment of the damper]
<Constitution>
FIG. 9 is a transverse sectional view showing a third embodiment of a damper according to the present invention (corresponding to a 3-3 section of the damper shown in FIG. 1).

  The damper of the present embodiment is different from the damper of the first embodiment in that the two outlet portions 24A, 24B are selectively opened and closed by a mask 34 having three openings 40A, 40B, 40C. . Therefore, only this difference will be described here.

  As shown in FIG. 9, the three openings 40 </ b> A, 40 </ b> B, and 40 </ b> C are arranged on the circumference of the radius R at 90 ° intervals.

  Here, when the opening 40A is the first opening, the opening 40B is the second opening, and the opening 40C is the third opening, the first opening 40A and the third opening 40C are: It is an opening for opening the two outlet portions 24A and 24B simultaneously. The second opening 40B is an opening for opening one of the two outlets 24A and 24B.

<Action>
The damper of the present embodiment also selectively opens and closes the two outlet portions 24A and 24B by rotating the mask 34 and changing the positions of the three openings 40A, 40B, and 40C.

  For example, when the two outlet portions 24A and 24B are opened together, as shown in FIG. 9, the first opening portion 40A is positioned on the same axis as the first outlet portion 24A, and the third opening portion 40C is the second opening portion. It is located on the same axis of the outlet portion 24B. As a result, the two outlet portions 24A and 24B are both opened.

  FIG. 10A is an explanatory diagram of the operation of the damper according to the third embodiment, and shows the position of the mask 34 when the two outlet portions 24A and 24B are closed together. As shown in the figure, in this case, the openings 40A, 40B, and 40C are not positioned at any outlet. As a result, the two outlet portions 24A and 24B are both covered with the mask 34, and the two outlet portions 24A and 24B are both closed.

  To close the two outlet portions 24A and 24B together, for example, the mask 34 is rotated 45 ° counterclockwise from a position where both the two outlet portions 24A and 24B are opened (position shown in FIG. 9). As a result, the two outlet portions 24 </ b> A and 24 </ b> B are both covered with the mask 34.

  FIG. 10B is an explanatory diagram of the operation of the damper according to the third embodiment, in which the mask 34 is opened when only the first outlet 24A is opened (= only the second outlet 24B is closed). It is a figure which shows a position. As shown in the figure, in this case, the second opening 40B is positioned coaxially with the first outlet 24A. As a result, the first outlet 24A communicates with the liquid chamber 14 via the second opening 40B. On the other hand, the second outlet 24B is covered with the mask 34 and closed.

  When only the second outlet 24B is opened (= only the first outlet 24A is closed), the second opening 40B is positioned on the same axis as the second outlet 24B. As a result, the second outlet portion 24B communicates with the liquid chamber 14 via the second opening 40B. On the other hand, the first outlet 24A is covered with the mask 34 and closed.

  Thus, the number of openings formed in the mask 34 can be increased or decreased as necessary. For example, when the number of outlet portions is two, if there are at least three openings, the two outlet portions can be selectively opened and closed.

[Fourth Embodiment of Damper]
<Constitution>
FIG. 11 is a cross-sectional view showing a fourth embodiment of a damper according to the present invention.

  The damper of the present embodiment is different from the damper of the first embodiment in that the main body 12 includes three outlet portions 24A, 24B, and 24C. Therefore, only this difference will be described here.

  The three outlet portions 24A, 24B, 24C are arranged at equal intervals (120 ° intervals) on the circumference of the radius R centering on the axis O passing through the center of the main body 12. In the following, for convenience, the outlet 24A is the first outlet, the outlet 24B is the second outlet, the outlet 24C is the third outlet, and the three outlets 24A, 24B, and 24C are required. Distinguish according to.

  The mask 34 is provided with six openings 40A, 40B, 40C, 40D, 40E, and 40F. Each of the openings 40A, 40B, 40C, 40D, 40E, and 40F is arranged on the circumference of the radius R centering on the center of the mask 34 (= the center of the main body 12). That is, it is arranged on the same circumference as the three outlet portions 24A, 24B, 24C.

  Here, the opening 40A is the first opening, the opening 40B is the second opening, the opening 40C is the third opening, the opening 40D is the fourth opening, and the opening 40E is the fifth. The opening and the opening 40F are defined as a sixth opening. The first opening 40A, the fourth opening 40D, and the sixth opening 40F are formed in the mask 34 as openings that simultaneously open the three outlets 24A, 24B, and 24C. Further, the third opening 40C and the fifth opening 40E are formed in the mask 34 as openings that simultaneously open two of the three outlets 24A, 24B, and 24C. The second opening 40B is formed in the mask 34 as an opening that opens one of the three outlets 24A, 24B, and 24C. In this case, with reference to the first opening 40A, the second opening 40B is arranged at a position rotated by 30 ° from the first opening 40A, and the third opening 40C is the first opening. The fourth opening 40D is disposed at a position rotated by 120 ° from the first opening 40A, and the fifth opening 40E is disposed at the first opening 40A. The sixth opening 40F is disposed at a position rotated by 240 ° from the first opening 40A.

<Action>
The damper according to the present embodiment also selectively opens and closes the three outlet portions 24A and 24B by rotating the mask 34 and changing the positions of the openings 40A, 40B, 40C, 40D, 40E, and 40F.

  For example, when the three outlet portions 24A, 24B, and 24C are opened together, as shown in FIG. 11, the first opening portion 40A is positioned on the same axis as the first outlet portion 24A, and the fourth opening portion 40D is The second outlet portion 24B is positioned on the same axis, and the sixth opening portion 40F is positioned on the same axis as the third outlet portion 24C. As a result, the three outlet portions 24A, 24B, and 24C are opened at a time.

  FIG. 12A is an explanatory diagram of the operation of the fourth embodiment, and shows the position of the mask 34 when all three outlet portions 24A, 24B, 24C are closed. As shown in the figure, in this case, the openings 40A, 40B, 40C, 40D, 40E, and 40F are not positioned at any outlet. As a result, the three outlet portions 24A, 24B, and 24C are all covered with the mask 34, and the three outlet portions 24A, 24B, and 24C are all closed.

  In order to close all the three outlet portions 24A, 24B, and 24C, for example, the mask 34 is rotated 60 ° counterclockwise from a position where all the three outlet portions 24A, 24B, and 24C are opened (position shown in FIG. 11). As a result, the three outlet portions 24A, 24B, and 24C are all covered with the mask 34.

  FIG. 12B is an explanatory diagram of the operation of the fourth embodiment, and shows the position of the mask 34 when only the first outlet 24A is opened. As shown in the figure, in this case, the second opening 40B is positioned coaxially with the first outlet 24A. As a result, the first outlet 24A communicates with the liquid chamber 14 via the second opening 40B. On the other hand, the second outlet portion 24B and the third outlet portion 24C are covered with the mask 34 and closed.

  Similarly, when only the second outlet portion 24B is opened, the second opening 40B is positioned on the same axis as the second outlet portion 24B, and when only the third outlet portion 24C is opened, The opening 40B is positioned on the same axis as the third outlet 24C.

  As described above, when only one outlet is opened, the second opening 40B is positioned on the same axis as the outlet to be opened.

  FIG. 13A is an explanatory view of the operation of the fourth embodiment, in which only the first outlet portion 24A and the second outlet portion 24B are opened (= only the third outlet portion 24C is closed). ) Is a diagram showing the position of the mask 34. As shown in the figure, in this case, the third opening 40C is located on the same axis as the first outlet 24A, and the fifth opening 40E is located on the same axis as the second outlet 24B. Let As a result, the first outlet 24A communicates with the liquid chamber 14 via the third opening 40C, and the second outlet 24B communicates with the liquid chamber 14 via the fifth opening 40E. The On the other hand, the third outlet 24C is covered with the mask 34 and closed.

  FIG. 13B is an explanatory diagram of the operation of the fourth embodiment, in which only the second outlet portion 24B and the third outlet portion 24C are opened (= only the first outlet portion 24A is closed). ) Is a diagram showing the position of the mask 34. As shown in the figure, in this case, the third opening 40C is positioned on the same axis as the second outlet 24B, and the fifth opening 40E is positioned on the same axis as the third outlet 24C. Let As a result, the second outlet 24B communicates with the liquid chamber 14 via the third opening 40C, and the third outlet 24C communicates with the liquid chamber 14 via the fifth opening 40E. The On the other hand, the first outlet 24A is covered with the mask 34 and closed.

  Similarly, when only the first outlet portion 24A and the third outlet portion 24C are opened (= only the second outlet portion 24B is closed), the third opening portion 40C is coaxial with the third outlet portion 24C. The fifth opening 40E is positioned on the same axis as the first outlet 24A.

  Thus, when opening only two exit parts, the 3rd opening part 40C and the 5th opening part 40E are located on the coaxial of the exit part to open.

  As described above, even if the main body is provided with three outlet portions, each outlet portion can be selectively opened and closed by the opening and closing portion constituted by a rotating mask. Similarly, a damper having four or more outlet portions in the main body can be configured to selectively open and close each outlet portion by appropriately adjusting the number and positions of openings formed in the mask.

[Fifth embodiment of damper]
<Constitution>
FIG. 14 is a cross-sectional view showing a fifth embodiment of a damper according to the present invention.

  The damper of the present embodiment is different from the damper of the first embodiment in the positions of the two outlet portions 24A and 24B provided in the main body 12. Therefore, only this difference will be described here.

  In the damper according to the first embodiment, two outlet portions 24A and 24B provided in the main body 12 are arranged on the same circumference.

  As shown in FIG. 14, in the damper according to the present embodiment, the two outlet portions 24A and 24B are arranged on different circumferences. Specifically, one outlet portion (first outlet portion) 24A is arranged on the circumference of the radius R1 from the center of the main body 12, and the other outlet portion (second outlet portion) 24B is the center of the main body 12. Arranged on the circumference of radius R2 (R2> R1) from the center, the two outlet portions 24A, 24B are arranged in parallel on a straight line passing through the center of the main body 12.

  An opening is formed in the mask 34 in accordance with the arrangement of the two outlet portions 24A and 24B. Specifically, openings 40A and 40B that simultaneously open the two outlets 24A and 24B, an opening 40C that opens only the first outlet 24A, and an opening 40D that opens only the second outlet 24B, Is formed.

  The openings 40A and 40B that simultaneously open the two outlet portions 24A and 24B are arranged on the same straight line passing through the center of the mask 34. One opening (first opening) 40A is arranged on the circumference of the radius R1 with the center of the mask 34 as the center, and the other opening (second opening) 40B is arranged on the mask 34. Are arranged on the circumference of the radius R2 centering on the center of.

  An opening (third opening) 40C that opens only the first outlet 24A is arranged on the circumference of the radius R1 with the center of the mask 34 as the center, and is opposite from the arrangement position of the first opening 40A. It is arranged at a position rotated 90 ° clockwise.

  An opening (fourth opening) 40D that opens only the second outlet portion 24B is disposed on the circumference of the radius R2 with the center of the mask 34 as the center, and the timepiece starts from the position where the second opening 40B is disposed. It is arranged at a position rotated 90 ° around.

<Action>
As shown in FIG. 14, the damper of the present embodiment configured as described above has two outlet portions 24 </ b> A, by positioning the first opening 40 </ b> A on the same axis as the first outlet 24 </ b> A. 24B can be opened simultaneously. That is, when the first opening 40A is positioned on the same axis as the first outlet 24A, the second opening 40B is disposed on the same axis as the second outlet 24B at the same time. The two outlet portions 24A and 24B can be opened simultaneously.

  Further, when the two outlet portions 24A and 24B are simultaneously closed, the mask 34 is rotated 180 ° from a position where the two outlet portions 24A and 24B are simultaneously opened. Accordingly, the two outlet portions 24A and 24B are covered with the mask 34 and closed.

  When only the first outlet portion 24A is opened, the mask 34 is rotated 90 ° clockwise from the position where the two outlet portions 24A and 24B are simultaneously opened. As a result, the third opening 40C is arranged on the same axis as the first outlet 24A, the first outlet 24A is opened, and the second outlet 24B is covered with the mask 34. Thereby, only the first outlet 24A is opened.

  When only the second outlet portion 24B is opened, the mask 34 is rotated 90 ° counterclockwise from the position where the two outlet portions 24A and 24B are simultaneously opened. As a result, the fourth opening 40D is arranged on the same axis as the second outlet 24B, the second outlet 24B is opened, and the first outlet 24A is covered with the mask 34. Thereby, only the 2nd exit part 24B is opened.

  As described above, the plurality of outlet portions provided in the main body do not necessarily need to be arranged on the same circumference, and the layout can be appropriately changed.

[Sixth Embodiment]
<Constitution>
FIGS. 15 and 16 are a longitudinal sectional view and a transverse sectional view, respectively, showing a sixth embodiment of a damper according to the present invention.

  The damper 10 of the present embodiment is different from the damper of the first embodiment in the configuration of the opening / closing member. Therefore, only the configuration of the opening / closing member which is a different part will be described here.

  As shown in FIGS. 15 and 16, the opening / closing member 50 includes a disc-shaped rotating body 52 and a plurality of valve bodies 54 </ b> A, 54 </ b> B, 54 </ b> C, 54 </ b> D connected to the rotating body 52 (four in the present embodiment). And is disposed so as to overlap the bottom surface 14 </ b> C of the liquid chamber 14.

  The rotating body 52 includes a rotating shaft 52A at the center. The rotation shaft 52A is connected to a motor as a rotation driving means through an insertion hole 44 provided in the end surface portion 12C of the main body 12 (see FIG. 2). Therefore, the rotating body 52 is disposed at the center of the main body 12 (= the center of the liquid chamber 14).

  The four valve bodies 54A, 54B, 54C, and 54D are connected to the rotating body 52 through four connection portions 56A, 56B, 56C, and 56D provided in the rotating body 52.

  The four connection portions 56A, 56B, 56C, and 56D all have the same length. When the connecting portion 56A is the first connecting portion, the connecting portion 56B is the second connecting portion, the connecting portion 56C is the third connecting portion, and the connecting portion 56D is the fourth connecting portion, the second connecting portion 56B is The first connecting portion 56A is arranged at a position rotated 45 ° clockwise with reference to the first connecting portion 56A. The third connecting portion 56C is arranged at a position rotated 135 ° clockwise with respect to the first connecting portion 56A. The fourth connecting portion 56D is arranged at a position rotated 180 ° clockwise with respect to the first connecting portion 56A.

  The plurality of valve bodies 54 </ b> A, 54 </ b> B, 54 </ b> C, 54 </ b> D have a disk shape with a diameter larger than the diameters of the two outlet portions 24 </ b> A, 24 </ b> B provided in the main body 12. Here, when the valve body 54A is the first valve body, the valve body 54B is the second valve body, the valve body 54C is the third valve body, and the valve body 54D is the fourth valve body, the first valve body 54A is connected to the first connection portion 56A, and the second valve body 54B is connected to the second connection portion 56B. The third valve body 54C is connected to the third connection portion 56C, and the fourth valve body 54D is connected to the fourth connection portion 56D.

  The valve bodies 54A, 54B, 54C, 54D connected to the connecting portions 56A, 56B, 56C, 56D are arranged so as to overlap the bottom surface 14C of the liquid chamber 14 and center on an axis O passing through the center of the main body 12. Arranged on the circumference of the radius R.

  Here, the first valve body 54A and the fourth valve body 54D are configured as valve bodies that simultaneously close the two outlet portions 24A and 24B provided in the main body 12, and the second valve body 54B is configured as a first valve body 54B. It is comprised as a valve body which closes only the exit part 24A. Further, the third valve body 54C is configured as a valve body that closes only the second outlet portion 24B.

  When the rotating body 52 is driven by the motor 36, the valve bodies 54A, 54B, 54C, and 54D rotate while sliding on the bottom surface 14C of the liquid chamber 14. The two outlet portions 24A, 24B are closed by the valve bodies 54A, 54B, 54C, 54D being located coaxially.

<Action>
The damper 10 of the present embodiment configured as described above moves the positions of the four valve bodies 54A, 54B, 54C, 54D connected to the rotating body 52 by rotating the rotating body 52 with the motor 36. Thus, the two outlet portions 24A and 24B are selectively opened and closed.

  As described above, the two outlet portions 24A and 24B are disposed on the circumference of the radius R with the axis O as the center, and are disposed at positions 180 ° apart from each other. Four valve bodies 54A, 54B, 54C, 54D connected to the rotating body 52 are also arranged on the circumference of the radius R with the axis O as the center. Therefore, when the rotating body 52 is rotated, each valve body 54A, 54B, 54C, 54D moves on the circumference where the two outlet portions 24A, 24B are arranged.

  First, the case where both the two exit parts 24A and 24B are closed will be described. FIG. 17A is an explanatory diagram of the operation of the damper according to the sixth embodiment, and shows a state in which the two outlet portions 24A and 24B are both closed. As shown in the figure, in this case, the first valve body 54A is positioned on the same axis as the first outlet portion 24A, and the fourth valve body 54D is positioned on the same axis as the second outlet portion 24B. As a result, the two outlet portions 24A and 24B are both closed and closed by the valve bodies 54A and 54D.

  The position of the rotating body 52 when the two outlet portions 24A and 24B are both closed as described above is referred to as a “closed / closed position”.

  Next, the case where both the two exit parts 24A and 24B are opened will be described. FIG. 17B is an explanatory diagram of the operation of the damper according to the sixth embodiment, and shows a state where the two outlet portions 24A and 24B are both opened. As shown in the figure, in this case, the valve bodies 54A, 54B, 54C, 54D are not positioned at any outlet. As a result, the two outlet portions 24A and 24B are both opened. That is, it is not covered with the valve bodies 54A, 54B, 54C, 54D.

  In order to open the two outlet portions 24A and 24B together, for example, the rotating body 52 is rotated 90 ° counterclockwise from the “closed / closed position”. As a result, the two outlet portions 24A and 24B are both opened.

  The position of the rotating body 52 when the two outlet portions 24A and 24B are both opened as described above is referred to as an “open / open position”.

  Next, a case where only the first outlet portion 24A is opened (= a case where only the second outlet portion 24B is closed) will be described. FIG. 18A is an explanatory diagram of the operation of the damper according to the sixth embodiment, and shows a state in which only the first outlet portion 24A is opened. As shown in the figure, in this case, the third valve body 54C is positioned on the same axis as the second outlet portion 24B. Accordingly, only the second outlet portion 24B is covered with the third valve body 54C, and only the first outlet portion 24A is opened.

  In order to open only the first outlet 24A, for example, the rotating body 52 is rotated 45 ° clockwise from the “closed / closed position”. As a result, the third valve body 54C is positioned on the same axis as the second outlet portion 24B, and only the second outlet portion 24B is closed by the valve body.

  Note that the position of the rotating body 52 when only the first outlet 24A is opened as described above is referred to as an “open / closed position”.

  Next, a case where only the second outlet portion 24B is opened (= a case where only the first outlet portion 24A is closed) will be described. FIG. 18B is an explanatory diagram of the operation of the damper according to the sixth embodiment, and shows a state in which only the second outlet portion 24B is opened. As shown in the figure, in this case, the second valve body 54B is positioned coaxially with the first outlet portion 24A. Thereby, only the first outlet portion 24A is covered with the second valve body 54B. Only the second outlet 24B is opened.

  To open only the second outlet 24B, for example, the rotating body 52 is rotated 45 ° counterclockwise from the “closed / closed position”. Accordingly, the second valve body 54B is positioned on the same axis as the first outlet portion 24A, and only the first outlet portion 24A is closed by the valve body.

  Note that the position of the rotating body 52 when only the second outlet 24B is opened as described above is referred to as a “closed / open position”.

  As described above, the damper 10 according to the present embodiment rotates the rotating body 52 to change the positions of the four valve bodies 54A, 54B, 54C, 54D connected to the rotating body 52, so that two outlets are provided. The parts 24A and 24B can be selectively opened and closed.

  In addition, when the main body is provided with three or more outlet portions, each outlet portion is selectively configured with the same configuration by adjusting the number and arrangement of the valve bodies in accordance with the number and arrangement of the outlet portions. Can be opened and closed.

  Moreover, the shape of a valve body should just be a shape which can block | close an exit part, and does not necessarily need to be a disk shape. FIG. 19 is a plan view showing another example of the valve body. As shown in the figure, the valve element 54 may be formed in a rectangular plate shape. In addition, in the example shown in the figure, the valve body 54 is comprised by one. That is, the valve body that closes the first outlet portion 24A, the valve body that closes the second outlet portion 24B, and the single valve body 54 are configured to be shared. Thus, the valve body can also be comprised by one. It is preferable to select the number and shape of the valve bodies in accordance with the number and arrangement of the outlet portions.

[Other Embodiments of Damper]
In the series of embodiments described above, the main body has a cylindrical shape. However, the main body only needs to have a liquid chamber inside, and the specific shape is not particularly limited. FIG. 20 is a plan view showing another example of the liquid chamber. As shown in the figure, the shape of the main body 12 may be a square box shape. In this case, the liquid chamber 14 can be formed inside the main body 12 as a rectangular parallelepiped space. The outer shape of the main body may be a square box shape, and the shape of the liquid chamber formed inside may be a cylindrical shape.

  Moreover, in the said embodiment, although the shape of the mask which comprises an opening / closing member is made into the disk shape, the mask should just be a shape which can obstruct | occlude an exit part, The shape is not specifically limited. It is a top view which shows another example of a mask. As shown in the figure, a rectangular plate shape may be used.

  In the above embodiment, the rotation center of the opening / closing member is set at the center of the main body 12 (configured to rotate about the axis O passing through the center of the main body 12), but the opening / closing member. Is not necessarily coincident with the center of the main body 12. For example, as shown in FIG. 21, the rotation center (= axis O) of the mask 34 constituting the opening / closing member can be set to be shifted from the center CO of the main body.

  In addition, the diameter of the surface where the outlet part opens (bottom surface of the liquid chamber) is made by making the shape of the main body into a cylindrical shape and the shape of the mask constituting the opening / closing member to be a disc shape that matches the inner peripheral shape of the liquid chamber And by making the diameter of the mask constituting the opening / closing member the same size), the mask constituting the opening / closing member can be arranged in a compact body.

  The same applies to the case where the opening / closing member is composed of a rotating body and a valve body. FIG. 22 is a plan view showing another example of the main body and the liquid chamber. As shown in the figure, the shape of the main body 12 can be a square box shape, and the rotation center of the opening / closing member 50 can be set to be shifted from the center CO of the main body 12.

  In the series of embodiments described above, the main body is provided with an air chamber. However, the air chamber is not necessarily a necessary configuration, and can be omitted as necessary. Also, the gas-liquid separation membrane can be omitted as necessary.

  In the series of embodiments described above, the shape of the elastic film is circular, but the shape of the elastic film is not limited to this. It can be appropriately changed according to the shape of the liquid chamber. For example, in the embodiment shown in FIGS. 20 to 22, the shape of the elastic film is rectangular.

  In the series of embodiments described above, the elastic membranes are installed at a plurality of locations on the wall surface of the liquid chamber. However, the number of elastic membranes can be appropriately changed according to the shape of the liquid chamber. The same applies to the gas-liquid separation membrane. The gas-liquid separation membrane can adjust the ventilation resistance exerted on the air chamber according to the size and number of the membrane.

  In the series of embodiments described above, the opening / closing member is rotated by the motor, but may be rotated manually.

  In the above-described series of embodiments, the opening / closing member is rotated to open / close the outlet portion. However, the outlet portion can be opened / closed in a motion mode other than rotation. For example, the opening / closing member may be slid linearly along the surface of the liquid chamber where the outlet portion opens to open / close the outlet portion.

<Inkjet recording device>
Next, an embodiment of an ink jet recording apparatus in which a damper according to the present invention is incorporated in an ink supply system will be described.

[Inkjet recording device]
<Constitution>
FIG. 23 is a schematic configuration diagram of an ink jet printer which is an embodiment of the ink jet recording apparatus according to the present invention.

  The ink jet printer 100 is a color ink jet printer that prints a color image on a paper (sheet) P as a medium using inks of four colors of cyan, magenta, yellow, and black. A transport unit 110 that transports along the transport path, a print unit 120 that prints an image on a sheet P transported by the transport unit 110 in a single pass, and an ink supply unit that supplies ink to a print head included in the print unit 120 130.

[Transport section]
The transport unit 110 includes a plurality of drums 112A, 112B, and 112C, and transports the paper P along a fixed transport path while delivering the paper P from drum to drum. Each of the drums 112A, 112B, and 112C conveys the paper P by winding the paper P around the circumferential surface and rotating it. Each of the drums 112 </ b> A, 112 </ b> B, and 112 </ b> C includes a gripper, and grips the leading end of the paper P with the gripper to hold the paper P on the outer peripheral surface.

  Note that the paper P is fed to the transport unit 110 one by one from a paper feeding device (not shown). Further, the printed paper P is sequentially discharged from a terminal drum 112C to a paper discharge tray (not shown).

[Print section]
The print unit 120 prints an image on the paper P conveyed by the conveyance unit 110 in a single pass. Therefore, the print unit 120 includes a line-type print head (line head) corresponding to the width of the paper P. In addition, since the inkjet printer 100 of the present embodiment prints a color image, a plurality of print heads (hereinafter referred to as heads) are provided. Specifically, a head 122C that discharges cyan ink, a head 122M that discharges magenta ink, a head 122Y that discharges yellow ink, and a head 122K that discharges black ink are provided. The heads 122C, 122M, 122Y, and 122K are arranged at a constant interval on the transport path of the paper P transported by the drum 112B.

  Here, the configuration of the heads 122C, 122M, 122Y, 122K will be outlined. Since the configurations of the heads 122C, 122M, 122Y, and 122K are the same, the configuration of the head 122 will be described here.

  FIG. 24 is a perspective view showing a schematic configuration of the head.

  As shown in the figure, the head 122 is configured by connecting a plurality (16 in this embodiment) of head modules 124-i (i = 1, 2,..., 16) in a line.

  Each head module 124-i has the same structure, and is connected to one line by being attached to the linear bar frame 128. The bar frame 128 includes a mounting portion (not shown) for mounting each head module 124-i, and the head module 124-i is detachably mounted on this mounting portion.

  Each head module 124-i is attached to the bar frame 128, whereby the nozzle surfaces provided at the tips are connected in a line to form one nozzle surface.

  FIG. 25 is a plan view of the nozzle surface of the head. In the drawing, the arrow Y direction is the conveyance direction of the paper P, and the arrow X direction is the width direction of the paper P (the axial direction of the drum).

  The nozzle surface 126 has a rectangular shape as a whole, and is provided with a belt-like nozzle arrangement region 126A at the center. The nozzle N is provided in the nozzle arrangement region 126A.

  FIG. 26 is an enlarged view of a nozzle arrangement region provided in the head module. In the figure, the arrow Y direction is the transport direction of the paper P, and the arrow X direction is the longitudinal direction of the head 122.

  As shown in FIG. 26, the nozzles N are arranged in a matrix. More specifically, the nozzles N are arranged at a constant pitch along a straight line x parallel to the X direction, and the nozzles N are arranged at a constant pitch along a straight line y inclined by a predetermined angle (α) with respect to the straight line x. Arranged. By arranging the nozzles N in this way, it is possible to narrow the interval between the nozzles N projected in the longitudinal direction of the head 122 (main scanning direction (X direction)), and the nozzles N can be arranged at high density. . In this case, the substantial arrangement direction of the nozzles N is the X direction. That is, the nozzle N is arranged substantially along the longitudinal direction of the head 122.

  Each head module 124-i is individually provided with an ink supply port 125S and individually supplied with ink (see FIG. 27).

[Ink supply unit]
The ink supply unit 130 supplies ink to the head 122 provided in the print unit 120. The ink supply unit 130 is provided for each head 122. That is, the cyan head 122C includes an ink supply unit that supplies cyan ink, the magenta head 122M includes an ink supply unit that supplies magenta ink, and the yellow head 122Y includes a yellow ink supply unit. The black head 122K is provided with an ink supply unit for supplying black ink. Since the configuration of each ink supply unit is the same, the configuration of the ink supply unit 130 will be described here.

  FIG. 27 is a schematic configuration diagram of the ink supply unit.

  The ink supply unit 130 mainly includes a tank 132 that stores ink to be ejected from the head 122, a supply pump 134S that supplies the ink stored in the tank 132 toward the head 122, and a supply pump 134S that supplies the ink from the tank 132. A supply-side manifold 136S that branches the flow paths of ink to be divided into a plurality (eight in this example), and a damper 10-n (n = 1) installed in each ink flow-path that is branched by the supply-side manifold 136S. 2,..., 8).

  The tank 132 stores ink that is ejected from the head 122. The tank 132 is connected to a main supply pipe 138S for feeding ink in the tank.

  The supply pump 134 </ b> S is an example of a supply liquid supply unit, and supplies ink stored in the tank 132 toward the head 122. The supply pump 134S is constituted by a tube pump, for example, and is installed in the middle of the main supply pipe 138S.

  The supply-side manifold 136S branches one ink flow path into a plurality of channels. The supply-side manifold 136S includes one inlet and a plurality of (eight in the present embodiment) outlets, and causes the ink flowing from one inlet to flow out equally from each outlet. A main supply pipe 138S is connected to the inlet, and a common supply pipe 140S constituting a common supply flow path is connected to the outlet. Each common supply pipe 140S is set to have the same flow path length.

  The damper 10-n is configured by the damper of the first embodiment described above, for example. Therefore, each damper 10-n is provided with an inlet portion 22 that functions as a first communication portion and two outlet portions 24A and 24B that function as a second communication portion. A plurality of common supply pipes 140S extending from the outlet of the supply side manifold 136S are connected to the inlet portion 22 of the damper 10-n, respectively. Moreover, the individual supply piping 142S which comprises an individual supply flow path is connected to the exit parts 24A and 24B of each damper 10-n, respectively.

  The individual supply pipes 142 </ b> S are set to have the same flow path length and are connected to the ink supply ports 125 </ b> S of the head module 124-i constituting the head 122.

  27, the damper 10-1 is the first damper, the damper 10-2 is the second damper,..., The head module 124-1 is the first head module, and the head module 124-2 is the second. , The first outlet module 24-1 of the first damper 10-1 is connected to the first head module 124-1, and the second outlet 24B of the first damper 10-1. Is connected to the second head module 124-2. The third head module 124-3 is connected to the first outlet portion 24A of the second damper 10-2, and the fourth head is connected to the second outlet portion 24B of the second damper 10-2. Module 124-4 is connected. Thus, the (2X-1) th head module is connected to the first outlet 24A of the Xth damper 10-X, and the (2X) th head module is connected to the second outlet 24B. Connected. Therefore, for example, when stopping the supply of ink to the (2X-1) th head module, the first outlet portion 24A of the Xth damper 10-X is closed, and the (2X) th head module is closed. In order to stop the ink supply, the second outlet 24B of the Xth damper 10-X may be closed.

  Driving of the motor 36 constituting the supply pump 134S and the damper 10-n is controlled by the ink supply control unit.

[Control system]
FIG. 28 is a block diagram showing a system configuration of a control system of the ink jet printer.

  The inkjet printer 100 includes a computer 150 that functions as a control unit. The computer 150 functions as a transport control unit that controls the transport unit 110, a print control unit that controls the print unit 120, and an ink supply control unit that controls the ink supply unit 130 by executing a predetermined control program.

  The computer 150 includes a communication unit 152 for communicating with an external device, an operation unit 154 for operating the inkjet printer 100, a display unit 156 for displaying various information, and a storage unit for storing various data. 158 etc. are connected. Image data of an image to be printed by the ink jet printer 100 is taken into the computer 150 via the communication unit 152. Further, a control program executed by the computer 150, various data necessary for control, and the like are stored in the storage unit 158.

  The computer 150 functions as an image processing unit by executing a predetermined control program. The image processing unit performs predetermined image processing on the image data of the image to be printed, and generates dot data necessary for printing by the printing unit 120. The computer 150 prints an image on the paper P by driving the heads 122C, 122M, 122Y, and 122K based on the generated dot data.

<Action>
Print Process The inkjet printer 100 executes a print process based on a print job. The print job is input from an external device via the communication unit 152.

  When a print job is input, the computer 150 generates dot data necessary for printing by the printing unit 120 from image data included in the print job.

  When the dot data is generated, the computer 150 feeds the paper P to the paper feeding device according to the print job. The sheet P fed from the sheet feeding device is transported along a certain transport path by the transport unit 110.

  The computer 150 drives the heads 122C, 122M, 122Y, and 122K according to the generated dot data, and ejects ink from the heads 122C, 122M, 122Y, and 122K toward the paper P that is transported by the transport unit 110. As a result, an image is printed on the paper P.

  In printing, ink is supplied from the ink supply unit 130 to the heads 122C, 122M, 122Y, and 122K. The ink is supplied by driving the supply pump 134S.

  At the time of printing, the outlet portions 24A and 24B of all the dampers 10-n are opened. As a result, ink can be supplied to each head module 124-i. In addition, a damper function can be provided in the flow path to each head module 124-i. By providing a damper function to the flow path of each head module 124-i, ink can be stably supplied to each head module 124-i, and ink ejection can be controlled correctly. Thereby, a high quality image can be printed.

  In each damper 10-n, when the power of the ink jet printer 100 is turned off, the outlets 24A and 24B are closed. That is, the exit portions 24A and 24B are closed as part of the termination process. Thereby, it is possible to prevent ink from leaking from the heads 122C, 122M, 122Y, 122K during the pause.

-Replacement of head module As described above, in the head 122 of the present embodiment, each head module 124-i is detachably attached to the bar frame 128. Therefore, when some of the head modules 124-i fail, only the failed head module 124-i can be replaced and used.

  When the head module is replaced, the outlet portions 24A and 24B of all the dampers 10-n are closed. When ink is replenished to the replaced head module after the replacement, only the outlet portion of the damper connected to the replaced head module is opened to replenish the ink. For example, when the seventh head module 124-7 is replaced, only the first outlet 24A of the fourth damper 10-4 connected to the seventh head module 124-7 is opened to replenish ink. Further, for example, when the second head module 124-2 and the seventh head module 124-7 are exchanged, the second outlet portion of the first damper 10-1 connected to the second head module 124-2. Only the first outlet 24A of the fourth damper 10-4 connected to 24B and the seventh head module 124-7 is opened to replenish ink. Thereby, ink can be replenished efficiently.

Purge When performing recovery processing of the heads 122C, 122M, 122Y, and 122K by purging (a method of discharging a small amount of ink from the head by a method other than ejection), it is possible to purge specific head modules. In this case, only the outlet portion of the damper connected to the head module to be purged is opened to drive the supply pump 134S. For example, when purging only the seventh head module 124-7, only the first outlet 24A of the fourth damper 10-4 connected to the seventh head module 124-7 is opened to drive the supply pump 134S. . Further, for example, when purging the second head module 124-2 and the seventh head module 124-7, the second outlet portion of the first damper 10-1 connected to the second head module 124-2. Only the first outlet 24A of the fourth damper 10-4 connected to 24B and the seventh head module 124-7 is opened to drive the supply pump 134S. Thereby, only a specific head module can be purged.

  As described above, according to the ink jet printer 100 of the present embodiment, ink can be stably supplied during printing by the action of the damper 10-n. Thereby, the ejection of ink can be controlled correctly and a high-quality image can be printed.

  Also, since one damper can be shared by two head modules, the number of dampers installed can be greatly reduced. Thereby, the space required for installing the damper can be saved, and the entire apparatus can be made compact.

  In addition, even when one damper is shared by two head modules, the ink supply to each head module can be stopped individually, so that each head module is individually connected in the same way as when individual valves are installed. Can be replaced or purged.

[Other Embodiments of Ink Supply Unit]
<Constitution>
FIG. 29 is a schematic configuration diagram showing another embodiment of the ink supply unit.

  The ink supply unit 130 according to the present embodiment circulates and supplies ink to the head 122 (122C, 122M, 122Y, 122K). In this case, each head module 124-i constituting the head 122 is provided with an ink supply port 125 </ b> S and an ink recovery port 125 </ b> R.

  As shown in FIG. 29, the ink supply unit 130 includes a tank 132, a main supply pipe 138S, a main recovery pipe 138R, a supply side manifold 136S, a recovery side manifold 136R, a supply pump 134S, and a recovery pump 134R. The common supply pipe 140S, the common recovery pipe 140R, the individual supply pipe 142S, the individual recovery pipe 142R, the supply side damper 10S-n, and the recovery side damper 10R-n are configured.

  The tank 132 stores ink that is ejected from the head 122.

  The main supply pipe 138S connects the tank 132 and the supply side manifold 136S.

  The main recovery pipe 138R connects the tank 132 and the recovery side manifold 136R.

  The supply pump 134 </ b> S as an example of the supply liquid supply unit is installed in the middle of the main supply pipe 138 </ b> S, and supplies ink from the tank 132 toward the head 122.

  The recovery pump 134R as an example of the recovery liquid feeding unit is installed in the middle of the main recovery pipe 138R and feeds ink from the head 122 toward the tank 132.

  The supply-side manifold 136S branches one ink flow path into a plurality of channels. The supply-side manifold 136S includes one inlet and a plurality of outlets, and the ink flowing from one inlet is branched equally and flows out from each outlet. A main supply pipe 138S is connected to the inlet of the supply side manifold 136S, and a common supply pipe 140S constituting a common supply flow path is connected to each outlet. Each common supply pipe 140S is set to have the same flow path length.

  The collection side manifold 136R collects a plurality of ink flow paths into one. The collection side manifold 136R includes a plurality of inlets and one outlet, collects ink flowing in from the plurality of inlets into one, and causes the ink to flow out from one outlet. A main recovery pipe 138R is connected to the outlet of the recovery side manifold 136R, and a common recovery pipe 140R constituting a common recovery flow path is connected to each inlet. The common recovery pipes 140R are set to have the same flow path length.

  Supply side damper 10S-n and recovery side damper 10R-n are constituted by the damper of a 1st embodiment mentioned above, for example. Therefore, each damper is provided with the inlet part 22 which functions as a 1st communication part, and the two exit parts 24A and 24B which function as a 2nd communication part.

  A plurality of common supply pipes 140S extending from the outlet of the supply side manifold 136S are respectively connected to the inlet portion 22 of the supply side damper 10S-n. In addition, individual supply pipes 142S constituting individual supply flow paths are connected to the outlet portions 24A and 24B of the respective supply side dampers 10S-n.

  A plurality of common recovery pipes 140R extending from the inlet of the recovery side manifold 136R are respectively connected to the inlet 22 of the recovery side damper 10R-n. In addition, individual recovery pipes 142 </ b> R constituting individual recovery flow paths are connected to the outlet portions 24 </ b> A and 24 </ b> B of the recovery side dampers 10 </ b> R-n.

  The individual supply pipes 142 </ b> S are set to have the same flow path length and are connected to the ink supply ports 125 </ b> S of the head module 124-i constituting the head 122.

  Further, the individual recovery pipes 142R are set to have the same flow path length, and are connected to the ink recovery ports 125R of the head module 124-i constituting the head 122, respectively.

  29, the supply side damper 10S-1 is a first supply side damper, the supply side damper 10S-2 is a second supply side damper,..., And the head module 124-1 is a first head module. When the head module 124-2 is a second head module,..., The ink supply port 125S of the first head module 124-1 is connected to the first outlet 24A of the first supply-side damper 10S-1. The ink supply port 125S of the second head module 124-2 is connected to the second outlet 24B of the first supply-side damper 10S-1. Further, the ink supply port 125S of the third head module 124-3 is connected to the first outlet portion 24A of the second supply side damper 10S-2, and the second supply side damper 10S-2 has a second outlet. An ink supply port 125S of the fourth head module 124-4 is connected to the outlet portion 24B. Thus, the ink outlet 125S of the (2X-1) th head module is connected to the first outlet 24A of the Xth supply-side damper 10S-X, and the second outlet 24B ( The ink supply port 125S of the 2X) th head module is connected.

  29, if the recovery side damper 10R-1 is a first recovery side damper, the recovery side damper 10R-2 is a second recovery side damper, and so on, the first of the first recovery side damper 10R-1 The outlet 24A of the first head module 124-1 is connected to the outlet 24A, and the second outlet 24B of the first recovery side damper 10R-1 is connected to the second outlet 24B of the second head module 124-2. An ink recovery port 125R is connected. In addition, an ink recovery port 125R of the third head module 124-3 is connected to the first outlet 24A of the second recovery side damper 10R-2, and the second recovery side damper 10R-2 has a second outlet. An ink recovery port 125R of the fourth head module 124-4 is connected to the outlet portion 24B. Thus, the ink outlet 125R of the (2X-1) th head module is connected to the first outlet 24A of the Xth recovery side damper 10R-X, and the second outlet 24B is ( The ink recovery port 125R of the 2X) th head module is connected.

<Action>
The ink is supplied to the head 122 as follows. That is, the supply pump 134S and the recovery pump 134R are driven to generate an ink flow from the tank 132 toward the head 122 and an ink flow from the head 122 toward the tank 132. As a result, the ink is circulated and supplied to the head 122.

  Note that when the ink is supplied, the drive of the supply pump 134S and the recovery pump 134R is controlled so that a predetermined back pressure is applied to the ink in the head.

  When the supply of ink to a specific head module 124-i is stopped, the operation is performed as follows. That is, the outlet portion of the supply-side damper 10S-n connected to the ink supply port 125S of the head module 124-i that stops supplying ink is closed, and the outlet portion of the recovery-side damper 10R-n connected to the ink recovery port 125R is closed. close up. Thereby, the supply of ink to the specific head module 124-i is stopped.

  For example, when the supply of ink to the fourteenth head module 124-14 is stopped, the second outlet portion of the seventh supply-side damper 10S-7 connected to the ink supply port 125S of the fourteenth head module 124-14. 24B is closed, and the second outlet 24B of the seventh recovery side damper 10R-7 connected to the ink recovery port 125R of the fourteenth head module 124-14 is closed. As a result, the supply of ink to the fourteenth head module 124-14 is stopped.

  Thus, in the ink supply unit of the present embodiment, ink can be circulated and supplied.

  Also, since one damper can be shared by two head modules, the number of dampers installed can be greatly reduced. Thereby, the space required for installing the damper can be saved, and the entire apparatus can be made compact. In particular, when ink is circulated and supplied as in the ink supply unit of the present embodiment, a damper is required for each of the supply system and the recovery system, but the number of installations is usually reduced by using the damper of the present invention. Can be reduced to less than half.

  In addition, even when one damper is shared by two head modules, the ink supply to each head module can be stopped individually, so that each head module is individually connected in the same way as when individual valves are installed. Can be replaced or purged.

[Inkjet recording apparatus and other embodiments]
In the above embodiment, one head is constituted by 16 head modules, but the number of head modules constituting one head is not particularly limited.

  In the above embodiment, the head modules are connected in a line as the form in which the head modules are connected in a line. However, the head modules may be arranged in a staggered pattern and connected in a line. A plurality of head modules can be arranged in parallel to constitute one head (a head that ejects the same kind of ink).

  In the above-described embodiment, a pump is used as the supply liquid feeding unit. However, it is also possible to use a configuration in which ink is fed from the tank to the head using a water head difference. In this case, the tank constitutes the supply liquid feeding unit. Similarly, the ink can be collected from the head by utilizing the water head difference. In this case, the ink supply unit includes a tank for supplying ink (supply tank) and a tank for collecting ink (collection tank).

  In the above embodiment, the damper is installed only on the individual supply pipe, but the damper can also be installed on the main supply pipe. The damper (main damper) installed in the main supply pipe is installed mainly for the purpose of suppressing the pulsation of the supply pump, and a damper having a large liquid chamber capacity is used. With respect to the ink supply unit that circulates and supplies ink, a damper can also be installed in the main recovery pipe.

  In the above embodiment, only a damper having two outlet portions is used, but it can also be used in combination with a damper having three or more outlet portions. It can also be used in combination with a normal damper. For example, when the number of head modules is an odd number, a damper having two outlet portions and a damper having three outlet portions or a normal damper can be used in combination.

  The ink jet recording apparatus is not limited to an ink jet printer. As an inkjet recording apparatus, for example, a color filter manufacturing apparatus for manufacturing a color filter by discharging ink or the like onto a film or glass, an organic EL display panel (an organic EL solution (organic electroluminescence solution)) is discharged onto a substrate ( A device for forming organic electroluminescence display panels), a device for forming bumps for mounting components by discharging molten solder (broadly defined ink) onto a substrate, and a liquid containing metal (broadly defined ink) An apparatus for forming a wiring pattern and various film forming apparatuses for discharging a droplet to form a film may be used as long as it can discharge a droplet.

  DESCRIPTION OF SYMBOLS 10 ... Damper, 10-n ... Damper, 10R-n ... Collection side damper, 10S-n ... Supply side damper, 12 ... Main body, 12A ... Outer wall surface part, 12B ... End face part, 12C ... End face part, 14 ... Liquid chamber , 14A ... inner peripheral wall surface of liquid chamber, 14B ... ceiling surface of liquid chamber, 14C ... bottom surface of liquid chamber, 16 ... air chamber, 18 ... elastic membrane, 20 ... gas-liquid separation membrane, 22 ... inlet (first communication) Part), 24A, 24B, 24C ... outlet part (second communication part), 26 ... opening / closing part, 28 ... partition, 30 ... elastic membrane installation part, 32 ... gas-liquid separation membrane installation part, 34 ... mask, 36 ... motor (Rotation drive means), 38 ... seal member, 40A, 40B, 40C, 40D, 40E, 40F ... mask opening, 42 ... mask rotation shaft, 44 ... insertion hole, 46 ... seal member, 50 ... opening / closing member, 52 ... Rotating body, 52A ... Rotating shaft of rotating body, 54, 54A, 4B, 54C, 54C ... Valve body, 56A, 56B, 56C, 56D ... Connection part, 100 ... Inkjet printer (inkjet recording apparatus), 110 ... Conveying part, 112A, 112B, 112C ... Drum, 120 ... Print part, 122 ( 122C, 122M, 122Y, 122K) ... head, 124-i ... head module, 125R ... ink recovery port, 125S ... ink supply port, 126 ... nozzle surface, 126A ... nozzle arrangement area, 128 ... bar frame, 130 ... ink supply , 132 ... tank, 134R ... recovery pump, 134S ... supply pump, 136R ... recovery side manifold, 136S ... supply side manifold, 138R ... main supply piping, 138S ... main supply piping, 140R ... common recovery piping, 140S ... common supply Piping, 142R ... Individual recovery piping, 14 S ... individual supply pipe, 150 ... Computer, 152 ... communication unit, 154 ... operating unit, 156 ... display unit, 158 ... storage unit, N ... nozzle, the axis passing through the center of the O ... body, P ... paper

Claims (19)

A main body having a liquid chamber;
An elastic membrane provided in the main body and suppressing pressure fluctuations inside the liquid chamber;
A first communication portion provided in the main body and communicating with the liquid chamber;
A plurality of second communication portions provided in the main body and communicating with the liquid chamber;
An opening / closing part provided in the main body, for selectively opening and closing the second communication part;
Damper equipped with. The plurality of second communication portions open on the same surface of one of the surfaces constituting the liquid chamber,
The opening / closing part includes an opening / closing member that rotates around an axis orthogonal to a surface that the second communication part opens to selectively open and close the second communication part.
The damper according to claim 1. The opening / closing part further includes a rotation driving means for rotating the opening / closing member.
The damper according to claim 2. The opening / closing member is composed of a plate-shaped mask having a plurality of openings, and is arranged so as to overlap the surface where the second communication portion opens, and rotates around the axis to position the opening. Opening the second communication part by adjusting the position of the second communication part, and closing the second communication part by shifting the position of the opening from the position of the second communication part;
The damper according to claim 3. The shaft is disposed at the center of the surface where the second communication portion opens.
The damper according to claim 4. The liquid chamber is provided in the main body as a cylindrical space,
The second communication portion opens at a circular end surface of the liquid chamber,
The mask constituting the opening / closing member has a disc shape,
The damper according to claim 5. The diameter of the surface on which the second communication part opens and the diameter of the mask constituting the opening / closing member are the same size.
The damper according to claim 6. The opening / closing member includes a rotating body disposed coaxially with the shaft and a valve body connected to the rotating body, and is disposed to overlap the surface where the second communication portion opens, and the shaft , The second communication portion is closed by adjusting the position of the valve body to the position of the second communication portion, and the position of the valve body is shifted from the position of the second communication portion. Open the second communication part,
The damper according to claim 3. The opening / closing member includes a plurality of the valve bodies,
The damper according to claim 8. The shaft is disposed at the center of the surface where the second communication portion opens.
The damper according to claim 8 or 9. The elastic membrane constitutes a part of the wall surface of the liquid chamber;
The damper according to any one of claims 1 to 10. The main body further includes an air chamber partitioned through the liquid chamber and the elastic membrane,
The damper according to any one of claims 1 to 11. In the air chamber, a part of the wall surface is composed of a gas-liquid separation membrane,
The damper according to claim 12. A transport section for transporting media;
A plurality of head modules, each having an ink supply port and a nozzle, for discharging ink supplied through the ink supply port from the nozzle toward the medium transported by the transport unit;
A tank for storing ink to be supplied to the head module;
A damper comprising the damper according to any one of claims 1 to 13,
A common supply flow path connecting the tank and the first communication portion of the damper;
A supply liquid feeding section for feeding the ink from the tank to the damper via the common supply flow path;
An individual supply flow path for individually connecting the ink supply port of the head module and the second communication portion of the damper;
An inkjet recording apparatus comprising: A plurality of the dampers;
A manifold further supplying the ink supplied from the common supply channel to the damper;
The ink jet recording apparatus according to claim 14. The head modules are connected in a row to form one head;
The ink jet recording apparatus according to claim 14 or 15. A transport section for transporting media;
An ink supply port, an ink recovery port, and a nozzle are provided, and the ink that is circulated and supplied through the ink supply port and the ink recovery port is ejected from the nozzle toward the medium transported by the transport unit Multiple head modules;
A tank for storing ink to be circulated and supplied to the head module;
A supply-side damper comprising the damper according to any one of claims 1 to 13,
A recovery-side damper comprising the damper according to any one of claims 1 to 13,
A common supply flow path connecting the tank and the first communication portion of the supply-side damper;
A supply liquid feeding section for feeding ink from the tank to the supply side damper via the common supply flow path;
An individual supply flow path for individually connecting the ink supply port of the head module and the second communication portion of the supply side damper;
An individual recovery flow path for individually connecting the ink recovery port of the head module and the second communication portion of the recovery side damper;
A common recovery flow path connecting the tank and the first communication part of the recovery side damper;
A collection liquid feeding section for feeding ink from the collection side damper to the tank via the common collection flow path;
An inkjet recording apparatus comprising: A plurality of the supply side damper and the recovery side damper are provided,
A supply-side manifold for supplying the ink supplied from the common supply flow path to the supply-side damper;
A collection-side manifold that collects and collects the ink collected from the collection-side damper in the common collection channel;
Further comprising
The ink jet recording apparatus according to claim 17. The head modules are connected in a row to form one head;
The ink jet recording apparatus according to claim 17 or 18.

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