JP2006247886A - Device for preventing ink pressure variation in recording head, recorder and liquid ejector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively and inexpensively prevent variation of an ink pressure in a recording head which is associated with the movement of a carriage, by a greatly simple and compact structure. <P>SOLUTION: The device 1 for preventing the ink pressure variation comprises a movable valve 34 set in the recording head 13. The movable valve 34 closes an inlet 33 of an ink A set in a fixed state to the recording head 13 by utilizing an acceleration force produced along with the movement of the carriage 10. The movable valve 34 moves in a direction to expand the inlet 33 of the ink A along with the attenuation of the acceleration force. A movable valve 45 is integrally set at a connection end to the recording head 13 of an ink tube 5. The movable valve 45 is controlled to open and close by utilizing deflective deformation of the ink tube 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an ink pressure fluctuation preventing device in a recording head that prevents a change in ink pressure in the recording head that occurs as the carriage moves in the main scanning direction during printing, and an ink pressure fluctuation in the recording head. The present invention relates to a recording apparatus including a prevention device.
Further, the present invention relates to a liquid ejecting apparatus such as an ink jet recording apparatus that performs recording (attaches liquid) on a recording material (liquid ejecting material) by ejecting (ejecting) a liquid such as ink from the head, and the liquid The present invention relates to a liquid pressure fluctuation preventing mechanism in a liquid ejecting head provided in the ejecting apparatus.

Here, the liquid ejecting apparatus uses an ink jet recording head, and is not limited to a recording apparatus such as a printer, a copying machine, and a facsimile machine that records ink on a recording material by discharging ink from the recording head. It is used to include a device for ejecting a liquid corresponding to the application from a liquid ejecting head corresponding to the recording head to a liquid ejecting material corresponding to a recording material and attaching the liquid to the liquid ejecting material.
In addition to the recording head, as a liquid ejecting head, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, and an electrode material (conductive paste) used for forming an electrode such as an organic EL display or a surface emitting display (FED) Examples thereof include an ejection head, a bioorganic matter ejection head used for biochip production, and a sample ejection head as a precision pipette.

Hereinafter, an ink jet printer which is an example of an ink jet recording apparatus or a liquid ejecting apparatus will be described as an example.
In an ink jet printer, a recording head is mounted on the lower surface of the carriage, the carriage is reciprocated in the main scanning direction, and the sheet is conveyed at a predetermined conveying speed in the sub-scanning direction orthogonal to the main scanning direction. Recording is performed over almost the entire area.

  In this case, the ink pressure in the recording head fluctuates due to abrupt movement of the carriage, and the ink dot diameter is increased or excess ink is ejected from the recording head, which adversely affects recording quality. The tendency is that the ink cartridge is not attached to the carriage, that is, as shown in FIG. 8, the ink cartridge is set in the printer main body in a fixed state, and the ink tube fed out from the ink cartridge is bent in a U shape. In the ink cartridge fixed type ink jet printer connected to the recording head, it appears remarkably.

  In this type of ink jet printer, as shown in FIG. 8A, the carriage 203, which was initially located on the left as an example, moves to the right as shown in FIG. In the linear portion 207 on the carriage 203 side, the pulsation that the ink A in the ink tube 205 tries to move to the carriage 203 side occurs. Then, this pulsation flows into the recording head, and the ink pressure in the recording head varies.

  Therefore, conventionally, the self-sealing valve 211 as shown in the following Patent Document 1 to FIG. 9 is provided in the recording head 209 to prevent the ink pressure in the recording head 209 from fluctuating. The self-sealing valve 211 forms a pressure adjustment chamber 217 that is blocked from the ink flow path between the ink A inlet 213 and the ink A inlet 215 in the recording head 209. 217 is provided. Specifically, a film 219 that partitions the pressure adjustment chamber 217 and the external space of the recording head 209 on the base end side (right end side in FIG. 9), a valve body 221 on the front end side (left end side in FIG. 9), and The self-sealing valve 211 is configured by including a biasing spring 223 that constantly biases the valve body 221 in the closing direction between the film 219 and the valve body 221.

  The operation mode of the self-sealing valve 211 will be briefly described with reference to FIG. 9. Since the pressure adjustment chamber 217 is normally cut off from the ink flow path, the pulsation of the ink A generated as the carriage 203 moves is described. Even if the gas flows into the inflow port 213, the valve body 221 prevents the flow into the pressure adjustment chamber 217. On the other hand, when the ink A is ejected, the pressure adjustment chamber 217 has a negative pressure, so that the film 219 is pushed inward as shown in FIG. The ink A is filled into the ink 217.

  However, during recording, the carriage 203 is constantly moving, and since the ink A is continuously ejected from the recording head 209, a minute clearance is actually generated in the valve body 221, and the ink caused by the pulsation is used. It could not be said that the pressure fluctuation was completely prevented. In addition, the provision of the self-sealing valve 211 having such a complicated structure in the recording head 209 causes an increase in product cost of the entire inkjet printer 201 and an increase in size of the inkjet printer 201.

International Publication WO 03/041964 A1

  Therefore, the object of the present invention was devised in view of the background art and the problems that the background art had, and the carriage was realized by adopting a very simple structure and a compact valve structure. Ink pressure fluctuation preventing device in the recording head capable of effectively and inexpensively preventing fluctuations in ink pressure in the recording head due to movement of the recording head, and a recording apparatus and liquid having the ink pressure fluctuation preventing device in the recording head It is to provide an injection device.

  In order to solve the above-described problem, an ink pressure fluctuation preventing apparatus in a recording head according to the first aspect of the present invention is an ink in a recording head that is generated as the carriage moves in the main scanning direction during recording. An ink pressure fluctuation preventing device in a recording head for preventing pressure fluctuations, wherein the ink pressure fluctuation preventing device in the recording head is fixed to the recording head by using an acceleration force generated by the movement of the carriage. The ink inlet provided in the state is closed, and a movable valve that moves in the direction of expanding the ink inlet as the acceleration force is attenuated is provided in the recording head. It is a feature.

  According to the first aspect of the present invention, the ink inflow port is closed when the carriage in which the ink pulsation occurs is moved, so that the inflow of ink into the recording head due to the pulsation is prevented. Further, when the carriage stops after moving, the acceleration force generated by the movement of the carriage is attenuated and the movable valve is opened, so that it is possible to fill the recording head with ink necessary for recording. . In addition, since the acceleration force generated by the movement of the carriage, which is a cause of ink pulsation, is used as it is as a means for obtaining the closed state of the movable valve, it has an extremely excellent configuration in terms of energy efficiency. .

According to a second aspect of the present invention, there is provided an ink pressure fluctuation preventing apparatus in a recording head according to the first aspect, wherein the movable valve is configured to perform a pendulum motion, and the vibration converges to a certain point due to gravity. It is characterized in that the ink inlet is expanded by use.
According to the second aspect of the present invention, the adoption of a movable valve that performs a pendulum motion contributes to the simplification and miniaturization of the mechanism. At that time, the swing of the movable valve becomes small and the state automatically shifts to the open state.

According to a third aspect of the present invention, in the ink pressure fluctuation preventing apparatus in the recording head according to the first aspect, the movable valve receives a biasing force in a direction in which the ink inlet is always expanded, The movable valve is configured to move in a direction to expand the ink inlet when the acceleration force is attenuated by the urging force.
According to the third aspect of the present invention, the number of parts increases and the mechanism becomes complicated by the amount of the urging member required, but the movable valve can be shifted to the open state in a short time after the acceleration force is attenuated. become. Alternatively, ink can be ejected in directions other than the vertical direction by appropriately adjusting the urging force and the urging direction of the urging member.

  According to a fourth aspect of the present invention, there is provided an ink pressure fluctuation preventing apparatus in a recording head that prevents fluctuations in ink pressure in the recording head that occur as the carriage moves in the main scanning direction during recording. The ink pressure fluctuation preventing device in the recording head comprises an ink tube connected to the recording head and a movable valve provided at a connection end of the ink tube. The movable valve is characterized in that it changes the direction of the ink flow path according to the change in the posture of the ink tube caused by the movement of the carriage, thereby opening and closing the ink inlet in the recording head.

  According to the fourth aspect of the present invention, the movable valve rotates by a predetermined angle due to the change in the posture of the ink tube caused by the movement of the carriage, and the closed state and the open state of the movable valve are automatically set according to the position where the carriage exists. Can be switched automatically. Therefore, this embodiment also contributes to the simplification and miniaturization of the mechanism, and ink can be ejected in directions other than the vertical direction by appropriately adjusting the rotation angle of the movable valve. Also, if the movable valve is set to the closed state when the carriage moves to the position where the ink pulsation is maximized, the ink pressure fluctuation in the recording head due to the pulsation is most effectively prevented. Is done.

An ink pressure fluctuation preventing device in a recording head according to a fifth aspect of the present invention is the ink pressure fluctuation preventing device in the recording head according to any one of the first to fourth aspects. The side wall in the main scanning direction of the head case forming the ink containing space in the recording head is formed of an elastic film that is elastically deformed as the carriage moves.
According to a sixth aspect of the present invention, there is provided the ink pressure fluctuation preventing apparatus in the recording head according to any one of the first to fourth aspects, wherein the ink pressure fluctuation preventing apparatus in the recording head is added to the above configuration. Most portions of the print head except the base end portion where the ink inflow port and the discharge communication port are formed are formed of an elastic film that is elastically deformed as the carriage moves. It is characterized by that.

  According to the fifth and sixth aspects of the present invention, in addition to the ink pressure fluctuation preventing action due to the pulsation caused by the carriage movement, the ink pressure fluctuation based on the vibration of the ink existing in the recording head. Are absorbed by elastic deformation of the elastic membrane. Therefore, the influence of the ink pressure fluctuation in the recording head caused by the movement of the carriage is further reduced, and recording with higher accuracy and higher quality can be performed.

  A recording apparatus according to a seventh aspect of the present invention is an ink pressure fluctuation preventing device in a recording head that prevents fluctuations in ink pressure in the recording head that occur as the carriage moves in the main scanning direction during recording. The ink pressure fluctuation preventing device in the recording head described in any one of the first to sixth aspects is applied as the ink pressure fluctuation preventing device in the recording head. Is.

  According to the seventh aspect of the present invention, the ink inflow port is closed when the carriage is moved to generate ink pulsation, so that the ink is prevented from flowing into the recording head due to the pulsation. Further, when the carriage stops after moving, the acceleration force generated by the movement of the carriage is attenuated and the movable valve is opened, so that it is possible to fill the recording head with ink necessary for recording. . In addition, since the acceleration force generated by the movement of the carriage, which is a cause of ink pulsation, is used as it is as a means for obtaining the closed state of the movable valve, it has an extremely excellent configuration in terms of energy efficiency. . By obtaining such an excellent ink pressure fluctuation preventing effect in the recording head, high-precision and high-quality recording is performed over the entire recording surface.

  In the liquid ejecting apparatus according to the eighth aspect of the invention, the liquid in the liquid ejecting head that prevents the liquid pressure in the liquid ejecting head from fluctuating due to the movement of the carriage in the main scanning direction during the liquid ejecting is provided. In the liquid ejecting apparatus including the pressure variation preventing mechanism, the liquid pressure variation preventing mechanism in the liquid ejecting head is provided in a fixed state with respect to the liquid ejecting head by using an acceleration force generated with the movement of the carriage. The liquid ejecting port is closed, and a movable valve that moves in the direction of expanding the liquid ejecting port as the acceleration force is attenuated is provided in the liquid ejecting head. Is.

  Hereinafter, a recording apparatus which is an example of a liquid ejecting apparatus including an ink pressure variation preventing apparatus in a recording head and a liquid pressure variation preventing mechanism in a liquid ejecting head according to the present invention will be described. First, an ink jet printer 100 is taken up as the best mode for carrying out a liquid ejecting apparatus of the present invention and a recording apparatus as an example thereof, and an outline of the entire configuration will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a state where an ink jet printer cover is removed, and FIG. 2 is a side sectional view showing an outline of the internal structure of the ink jet printer. The ink jet printer 100 described here is a portable ink jet printer having a relatively small size, light weight and a simple configuration suitable for carrying. Further, the feeding cassette 4 is located at the innermost side and the upstream side in the transport direction. The feeding cassette 4 includes a liquid ejecting apparatus main body and a recording apparatus main body as shown in FIGS. Is provided in a downwardly inclined posture at a position near the upper rear portion of the printer body 3 as an example. Accordingly, the printer main body 3 is not provided with a feeding tray which is generally installed, and the feeding cassette 4 functions as a feeding tray.

  A recording material P (hereinafter also simply referred to as “paper P”), which is an example of a large number of stacked liquid ejecting materials accommodated in the feeding cassette 4, is provided below the leading end of the feeding cassette 4. The leading edge of the paper P is pushed upward via the hopper plate 16 by the hopper push-up cam 30. Accordingly, the leading edge of the sheet P is pinched by the hopper plate 16 and the feeding roller 14 positioned above, and is fed by a pinching and feeding action that accompanies rotation about the rotation shaft 17 of the feeding roller 14. The upper sheet P stacked in the feeding cassette 4 is pulled out toward the transport path.

  Further, when a plurality of sheets P are pulled out, a separation pad (not shown), which is an example of a separation operation unit that separates the succeeding fed sheet P from the uppermost sheet P, and a separated succeeding sheet P. Only the uppermost sheet P is selected by a return lever (not shown) for returning the sheet P into the feeding cassette 4 and guided to the transport path.

  Below the feeding roller 14, a conveyance guide 32 that is inclined so as to become lower toward the front (left side in FIG. 2) is provided. The uppermost sheet P drawn by the pressure feeding action by the feeding roller 14 and the hopper plate 16 is guided by the conveyance guide 32 and guided above the conveyance roller 19. Further, on the upstream side in the transport direction before the transport roller 19, a recording material detection unit (not shown) (hereinafter simply referred to as a detection lever), which is an example of a liquid jet material detection unit that detects the passage of the paper P, is provided. ing.

  A recording position 26 is formed on the downstream side of the conveyance roller 19 in the conveyance direction. The recording position 26 is supported by a carriage guide shaft 12 that can reciprocate in the main scanning direction X as a main component of a recording execution unit that is an example of a liquid jet execution unit that executes recording on the paper P. A carriage 10 is provided. On the lower surface of the carriage 10, a recording head 13, which is an example of a liquid ejecting head that directly executes recording by ejecting (ejecting) ink, which is an example of liquid, onto the paper P is mounted. In addition, the carriage 10 includes, as an example, an ink that is an example of a liquid tube curved in a U shape or a J shape that extends from an ink cartridge C that is an example of a liquid cartridge mounted on the bottom of the printer body 3 from the back. The distal end portion of the tube 5 is connected, and is guided into the recording head 13 through an ink flow path which is an example of a liquid flow path (not shown).

  A platen 28 that defines a platen gap PG between the head surface of the recording head 13 and the paper P is provided below the recording head 13 so as to face the recording head 13. Then, between the carriage 10 and the platen 28, the sheet P is transported by a predetermined transport amount in the sub-scanning direction Y orthogonal to the main scanning direction X, and the recording head 13 is reciprocated once in the main scanning direction X. By alternately repeating the operation of ejecting ink from the recording head 13 onto the paper P, desired recording is performed over the entire recording surface of the paper P. Note that the platen gap PG is an extremely important element in executing high-precision recording, and is appropriately adjusted according to a change in the thickness of the paper P or the like.

  A discharge roller 20, which is an example of a liquid ejecting material discharge unit configured by a discharge drive roller 20 a and a discharge driven roller 20 b, is provided downstream of the recording head 13. Of these, the discharge driven roller 20 b is a toothed roller having a plurality of teeth on the outer periphery thereof, and is supported by the roller holder 21 in a freely rotatable state. Further, the discharge driven roller 20b is disposed such that its axial center position is located somewhat upstream in the transport direction from the discharge drive roller 20a. By adopting such an arrangement mode, the sheet P is formed in a curved state commonly called “reverse sled” that is slightly convex downward. As a result, the portion of the paper P located at the position facing the recording head 13 is pressed against the platen 28, so that the paper P is prevented from being lifted and recording is executed normally.

[Example]
Next, the ink pressure fluctuation preventing apparatus 1 in the recording head according to the present invention provided in the ink jet printer 100 will be described in detail.

  FIG. 3 is a principle diagram (a) in an open state and an example principle diagram (b) in a closed state showing an example of an ink pressure fluctuation preventing device. FIG. 4 is a principle diagram (a) in an open state and another principle diagram (b) in a closed state showing another example of the ink pressure fluctuation preventing device. FIG. 5 shows a principle diagram (a) in an open state and another principle diagram (b) in a closed state showing still another example of the ink pressure fluctuation preventing device. FIG. 6 is a principle diagram (a) in an open state and another principle diagram (b) in a closed state showing still another example of the ink pressure fluctuation preventing apparatus.

  The ink pressure fluctuation preventing apparatus 1 in the recording head according to the present invention is mainly caused by the pulsation of the ink (liquid) A in the ink tube 5 that occurs as the carriage 10 moves in the main scanning direction X during execution of recording. It has a role of preventing fluctuations in ink pressure (liquid pressure) in the recording head 13. In the ink pressure fluctuation preventing apparatus 1 shown in FIGS. 3 to 5, the ink A provided in a fixed state with respect to the recording head 13 using the acceleration force generated with the movement of the carriage 10 is used. The ink pressure fluctuation preventing apparatus 1 is configured by closing the inlet 33 and providing a movable valve 34 in the recording head 13 that moves in the direction of expanding the inlet 33 as the acceleration force is attenuated. Yes.

  The ink pressure fluctuation preventing apparatus 1 shown in FIG. 3 has an ink A inlet 36 connected to the ink tube 5 at the upper part of the head case 35 of the recording head 13, and the ink A inlet 33 at the lower center of the head case 35. Each is equipped. A rotatable movable valve 34 that can be rotated over a predetermined angular range is provided in the vicinity below the inflow port 36.

  The movable valve 34 has a valve body 37 that functions as a rotation fulcrum and functions as a valve, and has a shape integrally provided with a nozzle 38 for guiding the ink A to the inflow port 33 below. ing. The valve body 37 has a spherical shape and is fitted in a spherical fitting recess 39 formed in the upper part of the head case 35 in a freely rotatable state. The nozzle 38 has a cylindrical shape, and a communication port 40 penetrating the valve body 37 is formed inside the nozzle 38. Since the movable valve 34 employs such a configuration including the valve element 37 and the nozzle 38, the tip of the nozzle 38 is connected to the inlet 33 as shown in FIG. 3A when the carriage 10 is stopped. Takes a vertical posture to face.

  When an acceleration force is generated as the carriage 10 moves, the movable valve 34 is inclined in the direction opposite to the moving direction of the carriage 10 and penetrates the valve body 37 as shown in FIG. Since the position of the upper end surface of the movable member 34 is shifted from the position of the inflow port 36, the movable valve 34 is closed. After that, the movable valve 34 starts pendulum movement, returns to the vertical posture shown in FIG. 3A by the convergence of vibration to a certain point due to gravity, and is again opened. Therefore, when the carriage 10 is moved, the movable valve 34 is in a closed state, so the pulsation of the ink A in the ink tube 5 caused by the sudden movement of the carriage 10 is not transmitted into the head case 35.

  In the ink pressure fluctuation preventing apparatus 1 shown in FIG. 4, the movable valve 34, the inlet 36, and the inlet 33 have the same configuration as the ink pressure fluctuation preventing apparatus 1 shown in FIG. ing. That is, in the ink pressure fluctuation preventing apparatus 1 shown in FIG. 4, the elastic film 41 in which the opposing side walls in the main scanning direction X of the head case 35 forming the ink A containing space are elastically deformed as the carriage 10 moves. It is constituted by.

  Even in such a configuration, the same operational effects as those of the ink pressure fluctuation preventing apparatus 1 shown in FIG. 3 can be obtained, and the following operational effects are further exhibited. That is, when the carriage 10 moves, the ink A existing in the head case 35 also moves simultaneously, so that the ink pressure of the ink A in the head case 35 slightly varies. In this case, as shown in FIG. 4B, the elastic film 41 is elastically deformed to absorb the ink pressure fluctuation. Accordingly, only an appropriate amount of ink A is ejected from the inlet 33, and high-precision and high-quality recording is executed.

  The ink pressure fluctuation preventing apparatus 1 shown in FIG. 5 has the same configuration of the movable valve 34 and the inflow port 36 as the ink pressure fluctuation preventing apparatus 1 shown in FIG. 3, and uses an elastic film. 4 is the same as the ink pressure fluctuation preventing apparatus 1 shown in FIG. 4, but the configuration of the head case 35 and the shape of the elastic film are different. That is, in the ink pressure fluctuation preventing apparatus 1 shown in FIG. 5, almost all portions of the recording head 13 except for the base end portion 43 where the ink inflow port 36 and the discharge communication port 42 of the head case 35 are formed in a bag shape. The elastic film 44 is used.

  Even in such a configuration, the same effect as the ink pressure fluctuation preventing apparatus 1 shown in FIG. 3 can be obtained, and further, the elastic film 41 in the ink pressure fluctuation preventing apparatus 1 shown in FIG. The same effect is exhibited. The ink A supplied into the head case 35 is guided from the discharge communication port 42 to the inflow port 33 (not shown) through a relay channel (not shown).

  The ink pressure fluctuation preventing apparatus 1 shown in FIG. 6 includes an ink tube 5 connected to the recording head 13 and a movable valve 45 provided at a connection end of the ink tube 5. The movable valve 45 opens and closes the inlet 33 of the ink A in the recording head 13 by switching the direction of the ink flow path 46 according to the change in the posture of the ink tube 5 caused by the movement of the carriage 10. The posture change of the ink tube 5 is realized by a restoring force from a bending deformation that occurs when the ink tube having elasticity is bent at 90 degrees or reversed in a U shape.

  Specifically, as shown in FIG. 6, the movable valve 45 is provided integrally with the ink tube 5, and the ink flow path 46 in the ink tube 5 penetrates the movable valve 45 into the head case 35. It extends. Further, the movable valve 45 has a spherical shape as an example, and is configured to be fitted into a fitting recess 47 formed in the head case 35 so as to rotate over a predetermined angle range (for example, 90 °). Has been.

  As an example, as shown in FIG. 6A, when the carriage 10 or the recording head 13 is located on the left end side, the ink flow path 46 in the movable valve 45 is set to coincide with the inflow port 33. The movable valve 45 is open. On the other hand, when the carriage 10 or the recording head 13 starts moving and is positioned on the right end side shown in FIG. 6B as an example, the movable valve 45 is rotated clockwise by a predetermined angle due to the change in the posture of the ink tube 5. The moving force acts, and the ink flow path 46 in the movable valve 45 shifts from the inflow port 33 and shifts to the closed state. Accordingly, if the movable valve 45 is set so as to be in the closed state when the carriage 10 is moved to a position where the pulsation of the ink A in the ink tube 5 is maximized, the inside of the recording head 13 caused by the pulsation is set. Ink pressure fluctuation can be most effectively prevented.

[Other embodiments]
The ink pressure fluctuation preventing apparatus 1 in the recording head according to the present invention, the recording apparatus 100 including the ink pressure fluctuation preventing apparatus 1 in the recording head, and the liquid ejecting apparatus are basically configured as described above. However, it is of course possible to change or omit the partial configuration without departing from the gist of the present invention.

  FIG. 7 is a principle diagram (a) and (b) showing two other embodiments of the ink pressure fluctuation preventing apparatus. That is, the ink pressure fluctuation preventing apparatus 1 shown in FIG. 7 basically has the same configuration as the ink pressure fluctuation preventing apparatus 1 shown in FIG. 3 is different from the ink pressure fluctuation preventing apparatus 1 shown in FIG. 3 in that an urging means for urging in the opening direction is provided.

  Among them, the ink pressure fluctuation preventing apparatus 1 shown in FIG. 7A includes a biasing spring 48 as a biasing means. Two urging springs 48 are provided on the left and right sides (corresponding to the main scanning direction X) of the nozzle 38, and one urging spring 48 is compressed and deformed according to the inclination direction of the movable valve 34, and the other urging spring. 48 is configured to be deformed in tension. Further, the ink pressure fluctuation preventing apparatus 1 shown in FIG. 7B includes a rubber-like elastic body 49 as an urging means. Two rubber-like elastic bodies 49 are provided and are provided using two left and right (corresponding to the main scanning direction X) housing spaces 50 formed by cutting out part of the valve body 37 of the movable valve 34. Yes. Then, one rubber-like elastic body 49 is compressed and deformed in accordance with the inclination direction of the movable valve 34, and urged so that the movable valve 34 is opened by its repulsive force.

  Incidentally, when such an urging means is provided, an effect of shifting the movable valve 34 in the closed state to the open state in a short time can be obtained. The urging means can be provided in the ink pressure fluctuation preventing apparatus 1 shown in FIGS. Further, as the urging means, another configuration using an air damper, a magnet or the like can be adopted.

The perspective view which shows the state which removed the cover of the inkjet printer. FIG. 2 is a side sectional view showing an outline of the internal structure of the ink jet printer. FIG. 3 is a principle diagram showing an example of an ink pressure fluctuation preventing device. FIG. 5 is a principle diagram showing another example of an ink pressure fluctuation preventing device. FIG. 6 is a principle diagram showing still another example of an ink pressure fluctuation preventing device. FIG. 6 is a principle diagram showing still another example of an ink pressure fluctuation preventing device. FIG. 6 is a principle diagram showing another embodiment of the ink pressure fluctuation preventing device. FIG. 4 is a schematic diagram illustrating a relationship between carriage movement and ink tubes. The sectional side view which shows the internal structure of a self-sealing valve.

Explanation of symbols

1 Ink pressure fluctuation prevention device (in the recording head), 3 printer body,
4 cassette for feeding, S5 ink tube, 10 carriage,
12 Carriage guide shaft, 13 Recording head, 14 Feeding roller,
16 hopper plate, 17 rotating shaft (for feeding roller), 19 conveying roller,
20 discharge roller, 20a drive roller for discharge, 20b driven roller for discharge,
21 Roller holder (for driven roller for discharge), 26 recording position, 28 platen,
30 hopper push-up cam, 32 transport guide, 33 inlet, 34 movable valve,
35 Head case, 36 Inlet, 37 Valve body, 38 Nozzle, 39 Fitting recess,
40 communication port, 41 elastic membrane, 42 discharge communication port, 43 base end part,
44 (bag-like) elastic membrane, 45 movable valve, 46 ink flow path, 47 fitting recess,
48 biasing spring (biasing means), 49 rubber-like elastic body (biasing means), 50 accommodating space,
100 Inkjet printer (recording device),
P paper (recording material), X main scanning direction, Y sub-scanning direction, PG platen gap,
A ink (liquid), C ink cartridge

Claims (8)

An ink pressure fluctuation preventing device for preventing fluctuations in ink pressure in a recording head that occurs in association with movement and stop of a carriage in the main scanning direction during recording,
The ink pressure fluctuation preventing device closes an ink inlet provided in a fixed state with respect to the recording head by using an acceleration force generated when the carriage is moved and stopped, and is accompanied by a decrease in the acceleration force. An ink pressure fluctuation preventing apparatus comprising a movable valve that moves in a direction of expanding the ink inlet.   2. The ink according to claim 1, wherein the movable valve is configured to perform a pendulum motion, and the ink inlet is expanded by utilizing vibration convergence to a certain point due to gravity. Pressure fluctuation prevention device.   2. The movable valve according to claim 1, wherein the movable valve receives a biasing force in a direction in which the ink inlet is always expanded, and is movable in a direction in which the ink inlet is expanded when the acceleration force is attenuated by the biasing force. An ink pressure fluctuation preventing apparatus, wherein the valve is configured to move. An ink pressure fluctuation preventing device for preventing fluctuations in ink pressure in a recording head that occurs in association with movement and stop of a carriage in the main scanning direction during recording,
The ink pressure fluctuation preventing device includes an ink tube connected to a recording head and a movable valve provided at a connection end of the ink tube, and the movable valve is an ink tube generated when the carriage moves and stops. An ink pressure fluctuation preventing apparatus characterized in that the direction of the ink flow path is changed by changing the posture to open and close the ink inlet into the recording head.   5. The ink pressure fluctuation preventing device according to claim 1, wherein, in addition to the above configuration, the ink pressure fluctuation preventing device includes a side wall in a main scanning direction of a head case forming an ink containing space in the recording head as the carriage moves. An ink pressure fluctuation preventing device comprising an elastic film that is elastically deformed.   5. The ink pressure fluctuation preventing device in the recording head according to claim 1, wherein the ink pressure fluctuation preventing device in the recording head includes an ink inlet and an ejection communication of a head case forming an ink containing space in the recording head. An ink pressure fluctuation preventing apparatus in a recording head, characterized in that almost all parts except a base end part where a mouth is formed are constituted by an elastic film which is elastically deformed as the carriage moves. A recording apparatus comprising an ink pressure fluctuation preventing device in a recording head for preventing fluctuations in ink pressure in the recording head that occurs as the carriage moves in the main scanning direction during recording,
A recording apparatus, wherein the ink pressure fluctuation preventing apparatus in a recording head according to any one of claims 1 to 6 is applied as the ink pressure fluctuation preventing apparatus in the recording head. A liquid ejecting apparatus including a liquid pressure fluctuation preventing mechanism in a liquid ejecting head that prevents fluctuations in the liquid pressure in the liquid ejecting head that occur with the movement of the carriage in the main scanning direction during the liquid ejecting.
The liquid pressure fluctuation preventing mechanism in the liquid ejecting head closes a liquid ejecting port provided in a fixed state with respect to the liquid ejecting head using an acceleration force generated with the movement of the carriage, and A liquid ejecting apparatus comprising: a movable valve that moves in a direction in which the liquid ejection port is expanded in accordance with attenuation in a liquid ejecting head.

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