JP6041732B2 - Damper device - Google Patents

Description

  The present invention relates to a damper device that is provided in an ink jet printer including a recording head that discharges ink and a tank that supplies ink, and suppresses fluctuations in pressure of ink supplied from the tank to the recording head.

  As a conventional damper device, an ink jet printer including an ink jet head that is a recording head that discharges ink and an ink cartridge that is a tank that supplies ink is used to adjust the pressure of ink supplied from the ink cartridge to the ink jet head. A pressure regulator that suppresses fluctuations is known (see Patent Document 1). The pressure regulator has a pressure chamber communicating with the ink jet head, and a through hole that is a communication path communicating the ink cartridge and the pressure chamber. A valve for opening and closing the through hole, and the valve is a through hole. A valve body that is a valve opening part for moving the valve in the valve opening direction that is a direction to open the valve body, and the valve body that supports the valve body and is deformed by a change in the amount of ink in the pressure chamber. And a diaphragm which is a film-like deformed portion to be moved.

JP 2011-110853 A

  The conventional damper device can keep the pressure of the ink in the pressure chamber within a predetermined range when the valve body is normal and can move the valve in the valve opening direction. However, in the conventional damper device, even though a part of the diaphragm is deformed due to a change in the amount of ink in the pressure chamber, an area of the diaphragm opposite to this area is deformed with respect to the valve body. In this case, since the valve body tilts, the force of the valve body to open the valve is weaker than in the normal case. As a result, the pressure of the ink in the pressure chamber is lower than in the normal case. Becomes lower. That is, the conventional damper device has a problem that it may not be possible to suppress fluctuations in the pressure of the ink supplied from the tank to the recording head.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a damper device that can improve the stability of performance that suppresses fluctuations in pressure of ink supplied from a tank to a recording head.

  The damper device according to the present invention is provided in an ink jet printer including a recording head that discharges ink and a tank that supplies the ink, and suppresses fluctuations in pressure of the ink supplied from the tank to the recording head. A pressure chamber communicating with the recording head; a communication path communicating the tank and the pressure chamber; and a valve for opening and closing the communication path; and the valve And the valve opening portion for moving the valve in the valve opening direction, which is the direction in which the valve opens the communication passage, and the valve opening portion that supports the valve opening portion and is deformed by a change in the amount of the ink in the pressure chamber. A plurality of annular regions having the same center and different deformation easiness. Provided and the plurality of annular regions, characterized in that it is constituted by bellows ring.

  With this configuration, the damper device according to the present invention has different ease of deformation of the plurality of annular regions in the deformable portion, and therefore, the order of deformation between the plurality of annular regions can be made different. The deformation in the region can be made uniform. Therefore, the damper device of the present invention can suppress the inclination of the valve opening portion when the deforming portion moves the valve opening portion in the valve opening direction. The stability of the performance to be suppressed can be improved as compared with the prior art.

  In the damper device of the present invention, the plurality of annular regions may be more easily deformed as the annular region is closer to the center.

  Since the annular region close to the center has a smaller diameter than the annular region far from the center, the distance in the valve opening direction between the one end and the other end is assumed if one end in the radial direction is deformed and the other end is not deformed. The inclination with respect to the plane orthogonal to the valve opening direction when is a specific distance is larger than that of the annular region far from the center. The damper device according to the present invention is more easily deformed as the annular region is closer to the center, so that the inclination with respect to the plane orthogonal to the valve opening direction can be suppressed as the annular region is closer to the center. When moving in the valve direction, the inclination of the valve opening portion can be suppressed. Therefore, the damper device of the present invention can improve the stability of the performance that suppresses the fluctuation of the pressure of the ink supplied from the tank to the recording head.

  Further, in the damper device of the present invention, the plurality of annular regions may be easily deformed because an annular region closer to the center has a larger subordinate angle of the bellows taper.

  With this configuration, the damper device of the present invention is, for example, compared to a configuration in which the ease of deformation of the annular region is changed by changing the interval of the arrangement of the annular bellows having the same taper angle of inclination, Changes in ease of deformation between the plurality of annular regions can be smoothed, and as a result, the valve opening portion can be smoothly moved in the valve opening direction by the deformation portion. Therefore, the damper device of the present invention can improve the performance of suppressing fluctuations in the pressure of ink supplied from the tank to the recording head.

  Moreover, the damper apparatus of this invention WHEREIN: The said deformation | transformation part may be provided with the restoring force by the said bellows.

  With this configuration, the damper device according to the present invention does not need to be separately provided with a restoring member such as a spring for restoring the deformed portion, so that the number of parts can be reduced.

  The damper device of the present invention can improve the stability of the performance that suppresses the fluctuation of the pressure of the ink supplied from the tank to the recording head.

1 is a perspective view of an ink jet printer according to a first embodiment of the present invention. It is a schematic diagram of the ink supply system of the inkjet printer shown in FIG. It is front sectional drawing of the damper apparatus shown in FIG. 2 when the valve has closed the communicating path. It is a perspective view of the film member shown in Drawing 3 in the state where it cut in half. It is front sectional drawing of the damper apparatus shown in FIG. 2 in case the valve has opened the communicating path. It is front sectional drawing of the example different from the example shown in FIG. 3 of the damper apparatus shown in FIG. 2 when the valve has closed the communicating path. FIG. 7 is a front sectional view of an example different from the example shown in FIGS. 3 and 6 of the damper device shown in FIG. 2 when the valve closes the communication path. It is front sectional drawing of the example different from the example shown in FIG.3, FIG.6 and FIG.7 of the damper apparatus shown in FIG. 2 when the valve has closed the communicating path. It is front sectional drawing of the damper apparatus of the inkjet printer which concerns on the 2nd Embodiment of this invention when the valve has closed the communicating path. It is a perspective view of the film member shown in Drawing 9 in the state where it cut in half. It is front sectional drawing of the damper apparatus of the inkjet printer which concerns on the 2nd Embodiment of this invention in case the valve has opened the communicating path. It is front sectional drawing of the example different from the example shown in FIG. 9 of the damper apparatus of the inkjet printer which concerns on the 2nd Embodiment of this invention when the valve has closed the communicating path.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, the configuration of the ink jet printer according to the present embodiment will be described.

  FIG. 1 is a perspective view of an inkjet printer 10 according to the present embodiment.

  As shown in FIG. 1, the ink jet printer 10 includes a main body 11 extending in the main scanning direction indicated by an arrow 10a, a transport device 12 for transporting a recording medium 90 such as paper, and a tank 13 for supplying ink. ing.

  The main body 11 includes a guide rail 11a extending in the main scanning direction indicated by an arrow 10a, and a carriage 11b supported by the guide rail 11a so as to be movable in the main scanning direction indicated by an arrow 10a.

  The conveying device 12 is a device that conveys the recording medium 90 in the sub-scanning direction indicated by an arrow 10b with respect to a recording head 11c (see FIG. 2) described later of the main body 11.

  FIG. 2 is a schematic diagram of the ink supply system 14 of the inkjet printer 10.

  As shown in FIG. 2, the ink supply system 14 includes a recording head 11c that discharges the ink 10c to the recording medium 90, the tank 13 that supplies the ink 10c, and the ink 10c that is supplied from the tank 13 to the recording head 11c. And a damper device 20 that suppresses fluctuations in pressure.

  The recording head 11c and the damper device 20 are mounted on the carriage 11b.

  The ink jet printer 10 (see FIG. 1) includes a recording head 11c, a tank 13, and a damper device 20 for at least each type of ink 10c. The type of ink 10c is different depending on the type of color, such as cyan, magenta, yellow, and black.

  The ink jet printer 10 shown in FIG. 1 moves the recording head 11c (see FIG. 2) in the main scanning direction by the carriage 11b with respect to the recording medium 90 that does not move in the main scanning direction indicated by the arrow 10a. This is an apparatus for executing printing in the main scanning direction by the recording head 11c by ejecting ink 10c (see FIG. 2) from the nozzles toward the recording medium 90. Further, the inkjet printer 10 transports the recording medium 90 in the sub-scanning direction by the transport device 12 to the recording head 11c that does not move in the sub-scanning direction indicated by the arrow 10b, so that the sub-scan of the recording head 11c with respect to the recording medium 90 is performed. This is a device that changes the position in the direction every time printing in the main scanning direction ends.

  FIG. 3 is a front sectional view of the damper device 20 when the valve 23 closes the communication path 20e.

  As shown in FIG. 3, the damper device 20 includes a pressure chamber 20a that communicates with the recording head 11c (see FIG. 2), and a flow path 20b that forms part of the flow path that communicates with the recording head 11c and the pressure chamber 20a. A tank side chamber 20c communicating with the tank 13 (see FIG. 2), a flow path 20d constituting a part of a flow path communicating with the tank 13 and the tank side chamber 20c, and a pressure chamber 20a and the tank side chamber 20c. A communication path 20e is formed.

  The damper device 20 is fixed to the case 21 in which the flow path 20b and the flow path 20d are formed, a lid 22 fixed to the case 21, a valve 23 for opening and closing the communication path 20e, and the lid 22 and the valve 23. The spring 24 as a biasing member that biases the valve 23 in the valve closing direction indicated by the arrow 20f indicated by the arrow 23f that closes the communication passage 20e, and the valve 23 that is fixed to the case 21 closes the communication passage 20e. An O-ring 25 for preventing leakage of the ink 10c (see FIG. 2) between the case 21 and the valve 23, and an arrow indicating the direction in which the valve 23 opens the communication path 20e by contacting the valve 23 A shaft member 26 serving as a valve opening portion for moving the valve 23 in the valve opening direction indicated by 20g, and the shaft member 26 is supported and deformed by a change in the amount of ink 10c in the pressure chamber 20a. The shaft member 26 and a film member 30 as a modified portion having flexibility to move in the valve opening direction indicated by an arrow 20g.

  The pressure chamber 20 a is formed by the case 21 and the film member 30.

  The tank side chamber 20 c is formed by a case 21 and a lid 22.

  The communication path 20 e is formed by the case 21.

  The case 21, the lid 22, the valve 23, the shaft member 26, and the film member 30 are formed of a synthetic resin such as polyethylene.

  The lid 22 is fixed to the case 21 with an adhesive.

  The shaft member 26 is arranged between the valve 23 and the film member 30 and transmits a force received from one of the valve 23 and the film member 30 to the other.

  The film member 30 receives atmospheric pressure and changes the volume of the pressure chamber 20a by its own deformation.

  FIG. 4 is a perspective view of the film member 30 in a state of being cut in half.

  As shown in FIG. 4, the film member 30 includes an annular bellows (corrugated) 31 whose center is the same as the center 30 a of the film member 30. The bellows 31 includes a plurality of annular tapers 31a. The taper 31a constitutes the annular region of the present invention. The plurality of tapers 31a are more easily deformed because the taper 31a closer to the center 30a has a larger recess angle.

  Next, a method for manufacturing the damper device 20 will be described.

  First, after the O-ring 25 is fixed to the case 21, the lid 22 to which the valve 23 is fixed via the spring 24 is fixed to the case 21 with an adhesive.

  Then, the film member 30 with the shaft member 26 fixed with an adhesive is fixed to the case 21 with the adhesive.

  Next, the operation of the damper device 20 will be described.

  When the recording head 11c ejects the ink 10c, the amount of the ink 10c in the pressure chamber 20a of the damper device 20 decreases. When the amount of the ink 10c in the pressure chamber 20a decreases, the volume of the pressure chamber 20a decreases, so that the film member 30 is deformed in order from the taper 31a closer to the center 30a. As the film member 30 is deformed, the shaft member 26 moves in the valve opening direction indicated by the arrow 20 g and contacts the valve 23.

  Here, the sum of the force received from the shaft member 26 and the force received by the pressure of the ink 10c in the pressure chamber 20a is the sum of the force received from the spring 24 and the force received by the pressure of the ink 10c in the tank side chamber 20c. Cannot move in the valve opening direction indicated by the arrow 20g. When the valve 23 cannot move in the valve opening direction indicated by the arrow 20g, the shaft member 26 contacting the valve 23 cannot move in the valve opening direction indicated by the arrow 20g. When the shaft member 26 cannot move in the valve opening direction indicated by the arrow 20g, the amount of the ink 10c in the pressure chamber 20a is greatly reduced as compared with the amount of decrease in the volume of the pressure chamber 20a. .

  When the pressure of the ink 10c in the pressure chamber 20a decreases, the force of the film member 30 receiving the pressure of the ink 10c and the atmospheric pressure in the pressure chamber 20a pushing the valve 23 through the shaft member 26 increases.

  The valve 23 has a sum of a force received from the shaft member 26 and a force received by the pressure of the ink 10c in the pressure chamber 20a as a sum of a force received from the spring 24 and a force received by the pressure of the ink 10c in the tank side chamber 20c. Also increases, it moves in the valve opening direction indicated by the arrow 20g. That is, the valve 23 opens the communication path 20e.

  Therefore, the damper device 20 changes from the state shown in FIG. 3 to the state shown in FIG.

  FIG. 5 is a front sectional view of the damper device 20 when the valve 23 opens the communication passage 20e.

  The ink 10c in the tank side chamber 20c is applied with a high pressure due to the presence of the tank 13 at a higher position than the tank side chamber 20c. Therefore, when the damper device 20 enters the state shown in FIG. It is introduced into the chamber 20a.

  When the ink 10c is introduced from the tank side chamber 20c into the pressure chamber 20a, the amount of the ink 10c in the pressure chamber 20a increases. When the amount of the ink 10c in the pressure chamber 20a increases, the volume of the pressure chamber 20a increases, so that the shaft member 26 moves in the valve closing direction indicated by the arrow 20f as the film member 30 is deformed.

  When the shaft member 26 moves in the valve closing direction indicated by the arrow 20f, the valve 23 pressed against the shaft member 26 by the urging force of the spring 24 is accompanied by the movement of the shaft member 26 in the valve closing direction indicated by the arrow 20f. , And moves in the valve closing direction indicated by the arrow 20f. That is, the valve 23 closes the communication path 20e.

  Therefore, the damper device 20 changes from the state shown in FIG. 5 to the state shown in FIG. 3 again.

  As described above, since the damper device 20 is different in the ease of deformation of the plurality of tapers 31a of the bellows 31 in the film member 30, the order of deformation between the plurality of tapers 31a of the bellows 31 can be varied. As a result, the deformation within the same taper 31a can be made uniform. Therefore, the damper device 20 can suppress the inclination of the shaft member 26 when the shaft member 26 is moved in the valve opening direction indicated by the arrow 20g by the film member 30, and therefore the ink supplied from the tank 13 to the recording head 11c. The stability of the performance that suppresses fluctuations in the pressure of 10c can be improved as compared with the prior art.

  The damper device 20 can suppress the inclination of the shaft member 26 when the film member 30 moves the shaft member 26 in the valve opening direction indicated by the arrow 20g, and therefore a guide portion for suppressing the inclination of the shaft member 26. 27 (see FIG. 6) need not be provided. Therefore, the damper device 20 can simplify the shape of the case 21 as compared with the configuration shown in FIG. 6, and as a result, the manufacturing cost can be suppressed. However, the damper device 20 may include a guide portion 27 as in the configuration shown in FIG.

  Further, in the damper device 20, since the film member 30 has a restoring force by the bellows 31, the biasing member is fixed to the case 21 and the shaft member 26 and biases the shaft member 26 in the direction indicated by the arrow 20f. It is not necessary to separately provide a restoring member for restoring the film member 30, such as the spring 28 (see FIG. 7). Therefore, the damper device 20 can reduce the number of parts by the amount of the spring 28 and can simplify the shapes of the case 21 and the shaft member 26 as compared with the configuration shown in FIG. Manufacturing costs can be reduced. However, the damper device 20 may include a spring 28 as shown in FIG.

  Since the annular taper 31a near the center has a smaller diameter than the annular taper 31a far from the center, the arrow between the one end and the other end is assumed if one end in the radial direction is deformed and the other end is not deformed. When the distance in the valve opening direction indicated by 20g becomes a specific distance, the inclination with respect to the plane orthogonal to the valve opening direction indicated by the arrow 20g is larger than that of the annular taper 31a far from the center. Since the damper device 20 is more easily deformed as the annular taper 31a closer to the center, the inclination of the annular taper 31a closer to the center with respect to the plane perpendicular to the valve opening direction indicated by the arrow 20g can be suppressed. As a result, the film member When the shaft member 26 is moved by 30 in the valve opening direction indicated by the arrow 20g, the inclination of the shaft member 26 can be suppressed. Therefore, the damper device 20 can improve the stability of the performance of suppressing the fluctuation of the pressure of the ink 10c supplied from the tank 13 to the recording head 11c.

  The damper device 20 is easily deformed because the taper 31a of the taper 31a of the bellows 31 in the film member 30 is closer to the center because the taper 31a has a larger minor angle. Compared with the configuration in which the ease of taper deformation is made different by changing the interval of the arrangement of the plurality of tapers, the change in ease of deformation between the plurality of annular regions can be made smooth, As a result, the shaft member 26 can be smoothly moved by the film member 30 in the valve opening direction indicated by the arrow 20g. Therefore, the damper device 20 can improve the performance of suppressing fluctuations in the pressure of the ink 10c supplied from the tank 13 to the recording head 11c.

  In addition, as shown in FIG. 8, the film member 30 may have a configuration in which the taper 31a farther from the center is more easily deformed.

  Since the film member 30 has different angles of inclination of the plurality of annular tapers 31a, the accuracy of the dimensions of the plurality of annular tapers 31a is reduced as compared with the configuration in which the angles of inclination of the plurality of annular tapers are the same. As a result, the manufacturing cost can be reduced.

  Since the damper device 20 includes the plurality of annular regions of the present invention by the annular bellows 31, the ease of deformation of the plurality of annular regions can be varied with a simple configuration.

  The annular region of the present invention may be configured by a method other than the taper of the annular bellows. For example, the film member 30 may be formed in a flat shape, and a plurality of annular regions may be formed of different materials, and the ease of deformation of the materials of the plurality of annular regions may be different.

  In the present embodiment, the shaft member 26 is formed as a component separate from the film member 30, but may be formed as the same component as the film member 30.

(Second Embodiment)
First, the configuration of the ink jet printer according to the present embodiment will be described.

  In addition, about the structure similar to the structure of the inkjet printer 10 (refer FIG. 1) which concerns on 1st Embodiment among the structures of the inkjet printer which concerns on this Embodiment, the code | symbol same as the structure of the inkjet printer 10 is shown. Detailed description will be omitted.

  FIG. 9 is a front sectional view of the damper device 40 of the ink jet printer according to the present embodiment when the valve 23 closes the communication path 20e.

  The configuration of the inkjet printer according to the present embodiment is the same as the configuration in which the inkjet printer 10 (see FIG. 1) includes the damper device 40 shown in FIG. 9 instead of the damper device 20 (see FIG. 3).

  The damper device 40 has the same configuration in which the damper device 20 includes a film member 50 instead of the film member 30 (see FIG. 3).

  The film member 50 supports the shaft member 26 and is deformed by a change in the amount of the ink 10c in the pressure chamber 20a, thereby causing the shaft member 26 to move in the valve opening direction indicated by the arrow 20g. It is. The film member 50 is formed of a synthetic resin such as polyethylene.

  FIG. 10 is a perspective view of the film member 50 in a state of being cut in half.

  As shown in FIG. 10, the film member 50 includes an annular bellows 51 whose center is the same as the center 50 a of the film member 50. The bellows 51 includes a plurality of annular tapers 51a having the same recess angle. The interval between the arrangement of the plurality of tapers 51a decreases as the distance from the center 50a increases. As shown in FIG. 10, the bellows 51 can be divided into three annular regions 52. The three annular regions 52 are more easily deformed as the annular region 52 is closer to the center 50a.

  Next, the operation of the damper device 40 will be described.

  When the recording head 11c ejects the ink 10c, the amount of the ink 10c in the pressure chamber 20a of the damper device 40 decreases. When the amount of the ink 10c in the pressure chamber 20a decreases, the volume of the pressure chamber 20a decreases, so that the film member 50 is deformed in order from the annular region 52 near the center 50a. As the film member 50 is deformed, the shaft member 26 moves in the valve opening direction indicated by the arrow 20 g and contacts the valve 23.

  Thereafter, the damper device 40 operates in the same manner as the damper device 20, and the damper device 40 changes from the state shown in FIG. 9 to the state shown in FIG.

  FIG. 11 is a front sectional view of the damper device 40 when the valve 23 opens the communication passage 20e.

  The ink 10c in the tank side chamber 20c is applied with a high pressure due to the presence of the tank 13 at a position higher than the tank side chamber 20c. Therefore, when the damper device 40 enters the state shown in FIG. 11, the pressure passes through the communication path 20e. It is introduced into the chamber 20a.

  When the ink 10c is introduced from the tank side chamber 20c into the pressure chamber 20a, the amount of the ink 10c in the pressure chamber 20a increases. When the amount of the ink 10c in the pressure chamber 20a increases, the volume of the pressure chamber 20a increases, so that the shaft member 26 moves in the valve closing direction indicated by the arrow 20f as the film member 50 is deformed.

  Thereafter, the damper device 40 operates in the same manner as the damper device 20, and the damper device 40 changes from the state shown in FIG. 11 to the state shown in FIG. 9 again.

  As described above, in the damper device 40, since the ease of deformation of the three annular regions 52 of the bellows 51 in the film member 50 is different, the order of deformation between the three annular regions 52 of the bellows 51 is varied. As a result, the deformation in the same annular region 52 can be made uniform. Therefore, the damper device 40 can suppress the inclination of the shaft member 26 when the film member 50 moves the shaft member 26 in the valve opening direction indicated by the arrow 20g, and therefore the ink supplied from the tank 13 to the recording head 11c. The stability of the performance that suppresses fluctuations in the pressure of 10c can be improved as compared with the prior art.

  The damper device 40 can suppress the inclination of the shaft member 26 when the film member 50 moves the shaft member 26 in the valve opening direction indicated by the arrow 20g. It is not necessary to provide the guide part 27 (refer FIG. 6) for suppressing inclination. Therefore, the damper device 40 can simplify the shape of the case 21 as compared with the configuration shown in FIG. 6, and as a result, the manufacturing cost can be suppressed. However, the damper device 40 may include the guide portion 27 as in the configuration shown in FIG.

  Moreover, since the film member 50 is provided with the restoring force by the bellows 51, the damper apparatus 40 is fixed to the case 21 and the shaft member 26 similarly to the damper apparatus 20, and the shaft member 26 is moved in the direction indicated by the arrow 20f. There is no need to separately provide a restoring member for restoring the film member 50 such as a spring 28 (see FIG. 7) as a biasing member for biasing. Therefore, the damper device 40 can reduce the number of parts by the amount of the spring 28 and can simplify the shapes of the case 21 and the shaft member 26 as compared with the configuration shown in FIG. Manufacturing costs can be reduced. However, the damper device 40 may include the spring 28 as in the configuration shown in FIG.

  Since the annular region 52 near the center has a smaller diameter than the annular region 52 far from the center, if one end in the radial direction is deformed and the other end is not deformed, the arrow 20g between the one end and the other end The inclination with respect to the plane orthogonal to the valve opening direction indicated by the arrow 20g when the distance in the valve opening direction shown in FIG. Since the damper device 40 is more easily deformed in the annular region 52 closer to the center, the annular region 52 closer to the center can suppress the inclination with respect to the plane orthogonal to the valve opening direction indicated by the arrow 20g. When the shaft member 26 is moved in the valve opening direction indicated by the arrow 20g, the inclination of the shaft member 26 can be suppressed. Therefore, the damper device 40 can improve the stability of the performance of suppressing the fluctuation of the pressure of the ink 10c supplied from the tank 13 to the recording head 11c.

  In addition, as shown in FIG. 12, the film member 50 may have a configuration in which the annular region 52 farther from the center is more easily deformed.

  In the film member 50, since the shapes of the plurality of annular regions 52 are different from each other, the accuracy of the dimensions of the plurality of annular regions 52 can be reduced as compared with the configuration in which the shapes of the plurality of annular regions 52 are the same. As a result, manufacturing costs can be reduced.

  The plurality of tapers 51a of the bellows 51 of the film member 50 have the same minor angle, but the minor angles may be different.

  In the damper device 40, since the three annular regions 52 are configured by the annular bellows 51, the ease of deformation of the three annular regions 52 can be varied with a simple configuration.

  In the present embodiment, the shaft member 26 is formed as a component separate from the film member 50, but may be formed as the same component as the film member 50.

DESCRIPTION OF SYMBOLS 10 Inkjet printer 10c Ink 11c Recording head 13 Tank 20 Damper apparatus 20a Pressure chamber 20e Communication path 20g Arrow (arrow which shows valve opening direction)
23 Valve 26 Shaft member (valve opening)
30 Film member (deformation part)
30a center 31 bellows 31a taper 40 damper device 50 film member (deformation part)
50a center 51 bellows 51a taper 52 annular region

Claims (4)

A damper device that is provided in an ink jet printer including a recording head that discharges ink and a tank that supplies the ink, and suppresses fluctuations in pressure of the ink supplied from the tank to the recording head,
A pressure chamber communicating with the recording head, and a communication path communicating the tank and the pressure chamber are formed;
A valve for opening and closing the communication passage, a valve opening portion for moving the valve in a valve opening direction that is a direction in which the valve opens the communication passage by contacting the valve, and the valve opening portion And a deforming part that moves the valve opening part in the valve opening direction by being deformed by a change in the amount of the ink in the pressure chamber,
The deformable portion includes a plurality of annular regions having the same center and different ease of deformation,
The damper device, wherein the plurality of annular regions are configured by annular bellows.   The damper device according to claim 1, wherein the plurality of annular regions are more easily deformed as the annular region is closer to the center.   3. The damper device according to claim 1, wherein the plurality of annular regions are more easily deformed due to a larger angle of taper of the bellows in an annular region closer to the center.   The damper device according to any one of claims 1 to 3, wherein the deforming portion has a restoring force by the bellows.

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