The present invention relates to a liquid ejection apparatus that ejects a liquid and in particular to a liquid ejection apparatus comprising a recovery mechanism that recovers an ejection condition.
In Japanese Patent Laid-Open No. 2008-87446, in performing wiping to remove ink and dust attached to an orifice surface by wiping the orifice surface with a blade, the amount of feed of the blade toward the orifice surface is changed to vary the wiping pressure, or the pressure applied during the wiping. Specifically, disclosed is a configuration that increases the amount of feed of the blade to raise the wiping pressure when the blade wipes the nozzle portions in the orifice surface, and decreases the amount of feed of the blade to lower the wiping pressure when the blade gets separated from the orifice surface.
In the case where an orifice surface is wiped with a blade, the pressure of the wiping on the orifice surface is sometimes required to be changed according to the state of the ink attached to the orifice surface. On the other hand, the angle of the blade to the orifice surface during the wiping is required to be an angle within a suitable range irrespective of the magnitude of the pressure. However, in the method of Japanese Patent Laid-Open No. 2008-87446, the wiping pressure (pressure) inevitably determines the angle of the blade. Hence, in a case where the pressure of the wiping is changed, the angle of the blade changes according to the pressure. This leads to a problem in that it is difficult to perform wiping within a suitable angle range.
In view of the above, the present invention provides a liquid ejection apparatus which, in a case of performing wiping operations at different pressures, can perform each wiping operation while maintaining a suitable angle and pressure to an ejection port surface.
In an aspect of the present invention, there is provided, a liquid ejection apparatus comprising: a print head having an ejection port surface in which an ejection port for ejecting a liquid is provided; a wiper that has a wiping surface capable of contacting with the ejection port surface and performs a wiping operation of wiping the ejection port surface via relative movement between the wiper and the print head; an angle changing unit configured to change a fixed angle of the wiping surface to the ejection port surface in a state where the wiping surface is out of contact with the ejection port surface; wherein a distance to the ejection port surface from a tip of the wiper is changed in the state where the wiping surface is out of contact with the ejection port surface.
According to the present invention, it is possible to implement a liquid ejection apparatus which, in a case of performing wiping operations at different pressures, can perform each wiping operation while maintaining a suitable angle and pressure to an ejection port surface.
Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.
A first embodiment of the present invention will be described below with reference to drawings.
The sheet feeding unit 101 comprises a sheet feeding tray on which to load print media. The print media loaded on the sheet feeding tray are separated and fed one by one by a sheet feeding roller driven by a sheet feeding motor to be supplied to the conveyance unit 102. The conveyance unit 102 conveys the supplied print medium to the print unit 103 by pinching it with a conveyance roller 121 driven by a conveyance motor and a pinch roller 122 driven by the conveyance roller 121. The print unit 103 obtains image information from a connected computer and performs printing on the print medium by ejecting a liquid(s) (hereinafter referred to as “ink(s)”) from a print head(s) based on the obtained image information. The recovery mechanism 104 maintains or recovers the ink ejection performance of the print heads in order to maintain the quality of images to be printed. The print medium after the printing is pinched and conveyed by a sheet discharge roller driven in synchronization with the conveyance roller 121 and a spur roller to be discharged to the outside of the apparatus.
The print unit 103 comprises a carriage 6 capable of reciprocally moving in a main scanning direction, and print cartridges mounted on the carriage 6 and having the print heads. The carriage 6 is guided and supported to be capable of reciprocally moving in the main scanning direction along a guide rail installed in the apparatus main body. In the present embodiment, the main scanning direction of the carriage and the direction of conveyance of a print medium by the conveyance unit 102 are perpendicular to each other. The reciprocal movement of the carriage 6 is performed via a carriage belt 124 with a carriage motor as a drive source. In the liquid ejection apparatus 100, control is performed by detecting the position and speed of the carriage 6 with an encoder sensor mounted on the carriage 6 and an encoder scale laid on the apparatus main body side. Printing is performed on a print medium from the print head by repeating a printing operation of the print head performed in synchronization with movement of the carriage 6 in a print area and conveyance of the print medium by a predetermined pitch.
The recovery mechanism 104 comprises a wiping mechanism that wipes the ejection port surfaces of the print heads in which ejection ports for ejecting the liquids are provided, a capping mechanism that covers the ejection port surfaces, a pump mechanism that sucks the inks from the ejection ports, and so on. The recovery mechanism 104 comprises a slider which, as the carriage 6 moves toward the recovery mechanism 104, can move within a predetermined range by following the movement of the carriage 6. The slider is equipped with wipers included in the wiping mechanism and caps included in the capping mechanism. Details of this slider will be described later.
The MPU 201 is further connected to a print head driver 207, a carriage motor driver 208, and a sheet feeding-conveyance motor driver 209. The print head driver 207 controls print heads 5. The carriage motor driver 208 controls a carriage motor 204 that drives the carriage 6. The sheet feeding-conveyance motor driver 209 controls a sheet feeding-conveyance motor 205.
The host computer 214 is provided with the printer driver 2141, which, in response to a command to execute a printing operation issued by the user, gathers the image to be printed and print information such as the quality of the image to be printed and communicates them with the printing apparatus. The MPU 201 executes exchange of the image to be printed, etc. and so on with the host computer 214 via the I/F unit 213.
The recovery mechanism 104 comprises the wipers 8 and 9, the caps 1A and 1B, and so on, and comprises the slider 7, which is capable of sliding to a retreat position, a wiping position, and a capping position. The wipers 8 and 9 are each formed of a plate-shaped flexible member. The slider 7 is provided with a hitting portion 7a capable of contacting a side surface of the carriage 6 so that the slider 7 can move within a predetermined range by following movement of the carriage 6. The recovery mechanism 104 is provided next to the print area where printing is performed. As the carriage 6 moving in a y direction from the print area and the hitting portion 7a of the slider 7 contact each other, the slider 7 slides in the y direction. This enables the slider 7 to move from the retreat position to the wiping position and the capping position. Note that
The retreat position is a position at which the wipers 8 and 9 and the caps 1A and 1B are separated from the print heads 5. The wiping position is a position at which the wipers 8 and 9 can wipe the ejection port surfaces 51 and 52 of the print heads 5. In a state where the slider 7 is at the wiping position, the wiping of the ejection port surfaces 51 and 52 is performed via relative movement between the carriage 6 and the slider 7. Also, the capping position is a position at which the caps 1A and 1B can cover the ejection port surfaces 51 and 52 of the print heads 5. Details of the wiping operation performed at the wiping position will be described later.
At four positions on its side surfaces, the slider 7 is provided with protrusion portions 7b protruding in a direction perpendicular to (crossing) the movement direction of the carriage 6.
The wiper 8, which wipes the ejection port surface 51 of the color print head 5A, and the wiper 9, which wipes the ejection port surface 52 of the black print head 5B, are attached to the slider 7 via respective wiper holders 28 and 29. Also, the caps 1A and 1B, which cap the ejection port surfaces 51 and 52 of the print heads 5, are attached to respective cap holders 2A and 2B, and each of the cap holders 2A and 2B is attached to the slider 7 via claw portions at four positions. A cap spring not shown is disposed between each of the cap holders 2A and 2B and the slider 7, and the cap holders 2A and 2B with the caps 1A and 1B attached thereto are urged toward the ejection port surfaces 51 and 52. The wipers 8 and 9 and the caps 1A and 1B are disposed in order of the wiper 8, the cap 1A, the wiper 9, and the cap 1B from the print area side in
The slider 7 comprises a lock lever 16 as a locking member that locks the slider 7 at the wiping position. The lock lever 16 is attached to the slider 7 so as to be pivotable to a locking position at which the lock lever 16 locks the slider 7 at the wiping position and a release position at which the lock lever 16 releases the lock on the slider 7. The lock lever 16 restricts movement of the slider 7 in the −y direction in a case where the carriage 6 moves to the wiping position to wipe the ejection port surfaces 51 and 52 of the print heads 5 with the wipers 8 and 9.
The carriage 6 is provided with an unlocking protrusion portion 67 capable of contacting an upper end portion 16b of the lock lever 16 (see
The apparatus main body 13 is provided with an adjustment slider (angle changing unit) 20 that causes the adjuster 38 to slide. As the adjustment slider 20 moves in the x direction or the −x direction, either a protrusion portion 20a or a protrusion portion 20b of the adjustment slider 20 contacts a tip portion 38c of the adjuster 38 and slides the adjuster 38 in the x direction or the −x direction. Such movement of the adjustment slider 20 enables the orientations of the wiper 8 and the wiper holder 28 to be changed. Note that the adjustment slider 20 is configured to contact the tip portion 38c of the adjuster 38 in the state where the slider 7 is at the retreat position.
Note that the configuration of the wiper holder 29, to which the wiper 9 is attached, is similar to the configuration of the wiper holder 28, to which the wiper 8 is attached. Thus, only the wiper 8 and the wiper holder 28 will be described below, and description of the wiper 9 and the wiper holder 29 will be omitted.
The recovery process involving suction is performed with the wiper 8 substantially perpendicular to the ejection port surface 51 as shown in
The wiper holder 28, which holds the wiper 8, comprises a support shaft 28e and is provided so as to be pivotable about the support shaft 28e. The wiper holder 28 is urged at its lower end portion in a predetermined direction by a tension spring 23, and its orientation is maintained by the urging force of the tension spring 23 unless an external torque of a predetermined value or more is applied. The adjuster 38 is attached to the slider 7, and the contact between the contact portion 38a of the adjuster 38 and the cam surface 28a or 28b of the wiper holder 28 determines the orientation of the wiper holder 28.
In this state, the locking portion 13d restricts pivotal movement of the lock lever 16 in the direction of arrow BB and the protrusion portions 7b of the slider 7 are in contact with end portions of the cam surfaces of the slider cams 13a, so that the slider 7 is located at the retreat position and restricted from moving in the −y direction. In
The liquid ejection apparatus 100 comprises an angle switching drive transmission unit 105 as a drive transmission mechanism that slides the adjustment slider 20. The angle switching drive transmission unit 105 transmits drive of the conveyance roller 205 to the adjustment slider 20 while the carriage 6 is at an angle switching position being a position which is on the recovery mechanism side relative to the print area and at which the side surface of the carriage 6 and the hitting portion 7a of the slider 7 do not contact each other.
In a case where the carriage 6 is not at the angle switching position, the drive of the angle switching drive transmission unit 105 is off, as shown in
As the carriage 6 moves to the angle switching position, the drive of the angle switching drive transmission unit 105 is on, as shown in
In the state of
In the recovery process required to achieve a strong recovery effect, the wiping is performed with the wiper 8 set at approximately 90 degrees by the effect of the adjustment slider 20, as shown in
On the other hand, in the recovery process required to achieve a weak recovery effect, the wiping is performed with the wiper 8 set at approximately 70 degrees by the effect of the adjustment slider 20, as shown in
Note that the distance between the ejection port surface 51 and the slider 7 is the same in the recovery process required to achieve a strong recovery effect and the recovery process required to achieve a weak recovery effect. In other words, simply changing the angle of the wiper 8 switches between a wiping operation required to achieve a strong recovery effect and a wiping operation required to achieve a weak recovery effect. Thus, in the present embodiment, the wiping pressure during wiping is determined by the amount of bend of the wiper, and the angle of the wiper can be set at a suitable angle by the wiper fixed angle switching mechanism.
As described above, before executing a wiping operation, control to switch the angles of the wipers 8 and 9 according to whether the recovery operation involves an ink suction operation is performed in the state where the slider 7 is at the retreat position. For example, the case of executing the recovery process involving a suction operation includes a case where the printing apparatus has been left unused for a long period, a case where an abnormal termination occurs due to a paper jam, a power failure, or the like, a case where a strong recovery process is designated by a user command, and so on. Also, the case of executing the recovery process not involving a suction operation includes a case where a recovery process is performed in the middle of a printing operation, a case where a power off or a weak recovery process is designated by a user command, and so on.
In the case of the recovery process not involving suction, the amounts of inks attached to the ejection port surfaces 51 and 52 before the wiping operation are assumed to be small, and therefore a wiping operation at a low wiping pressure will sufficiently wipe the ejection port surfaces 51 and 52. On the other hand, in the case of the recovery process involving suction, the amounts of inks attached to the ejection port surfaces 51 and 52 before the wiping operation are assumed to be large, and therefore selected is the wiping of the ejection port surfaces 51 and 52 in a wiping operation at a high wiping pressure.
First, the recovery process involving suction in
Then in S403, the carriage 6 is moved to a later-described trigger position. As the slider 7 moves in they direction with the movement of the carriage 6, the tip portion 16a of the lock lever 16 at the release position gets separated from the locking portion 13d and is rotationally moved in the direction of arrow BB (see
The recovery mechanism 104 is capable of tilting the cap 1B as shown in
During the further movement of the carriage 6 in the −y direction toward the print area, the wipers 8 and 9, which are mounted on the slider 7, slide on the ejection port surfaces 51 and 52 of the print heads 5, which are mounted on the carriage 6, so that a wiping operation is performed. In this operation, the wiper 8 wipes the color print head 5A, and the wiper 9 wipes the black print head 5B.
After the wiping operation on the ejection port surfaces 51 and 52 by the wipers 8 and 9 is completed as the carriage 6 is moved further in the −y direction toward the print area, the protrusion portion 67 of the carriage 6 contacts the upper end portion 16b of the lock lever 16. This rotationally moves the lock lever 16 about the support shaft 16e in the direction of arrow AA. As a result, the tip portion 16a of the lock lever 16 gets separated from the locking portion 13d, so that the lock on the slider 7 by the lock lever 16 is released. The slider 7 released from the lock is moved in the −y direction along the slider cams 13a back to the retreat position by the spring urging force of the slider spring 17. The series of operations in the recovery process is performed in this manner.
Next, the recovery process not involving suction in
Note that the angles of the wiper are set at two angles of approximately 90 degrees and approximately 70 degrees in the present embodiment, but are not limited to these angles. The configuration may only need to be such that the angles can be set at a plurality of different angles.
As described above, the configuration is such that the angle of the wiping surface of each wiper to the corresponding ejection port surface can be changed while the wiper is in a non-contacting state, thus not performing wiping, and the ejection port surface can be wiped with the wiper after the wiping surface angle is changed. In this manner, it is possible to implement a liquid ejection apparatus which, in a case of performing wiping operations at a plurality of different wiping pressures, can perform each wiping operation at a suitable wiping pressure and a suitable angle.
Note that a configuration that performs wiping while following movement of the carriage has been described in the present embodiment, but the configuration is not limited to this. It is possible to employ a configuration that performs wiping by moving the wipers with another drive relative to the carriage in a stopped state. Further, as for the wiping direction, the configuration is not limited to a configuration in which wiping is performed in the main scanning direction of the carriage as in the present embodiment, but may be a configuration in which wiping is performed in the conveyance direction, which crosses (is perpendicular to) the main scanning direction.
Furthermore, each print head of the liquid ejection apparatus 100 is a serial head which performs printing while being scanned over a print medium, but is also applicable to a full-line type line head in which ejection ports are arrayed over a length corresponding to the width of a print medium.
A second embodiment of the present invention will be described below with reference to drawings. Note that the basic configuration in the present embodiment is similar to that in the first embodiment, and only the characteristic configuration will therefore be described below.
Also,
In the present embodiment, the support shaft 28e of the wiper holder 28 is configured to be movable in the ±z directions. As the adjuster 38 slides, the cam surface of the wiper holder 28 in contact with the contact portion 38a of the adjuster 38 switches between the cam surface 28a and the cam surface 28b. As a result, the wiper 8 rotationally moves about the support shaft 28e of the wiper holder 28.
A bearing hole 7f in the slider 7 holding the wiper holder 28 is in an elongated hole shape whose longitudinal direction is the z direction, and the support shaft 28e is movable in the ±z directions (see
In the first embodiment, in comparison between the case where the angle of the wiper 8 is changed to approximately 90 degrees and the case where the angle is changed to approximately 70 degrees, the height position of the tip of the wiper 8 is lower in the case where the wiper 8 is tilted at approximately 70 degrees since the wiper 8 pivoted about the same axis. In the present embodiment, the support shaft 28e is moved in the z direction, so that the height position of the tip of the wiper 8 can be set at the same position in the case where the angle of the wiper 8 is changed to approximately 90 degrees and in the case where the angle of the wiper 8 is changed to approximately 70 degrees. Further, by setting the tilt angle of the wiper 8 at approximately 60 degrees, the amount of bend of the wiper 8 during contact with the ejection port surface 51 is smaller than that in the first embodiment, so that a lower wiping pressure than in the first embodiment is achieved.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
This application claims the benefit of Japanese Patent Application No. 2019-015871 filed Jan. 31, 2019, which is hereby incorporated by reference wherein in its entirety.
Number | Date | Country | Kind |
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JP2019-015871 | Jan 2019 | JP | national |
Number | Name | Date | Kind |
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8794740 | Hamano | Aug 2014 | B2 |
20080129776 | Taira | Jun 2008 | A1 |
20120176444 | Takeda | Jul 2012 | A1 |
20130044159 | Hamano | Feb 2013 | A1 |
Number | Date | Country |
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2000-190512 | Jul 2000 | JP |
2001-322289 | Nov 2001 | JP |
2007-050568 | Mar 2007 | JP |
2008-087446 | Apr 2008 | JP |
2013-060003 | Apr 2013 | JP |
2013-067087 | Apr 2013 | JP |
2018-134824 | Aug 2018 | JP |
Entry |
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Office Action dated Jan. 5, 2021 in counterpart Japanese Application No. 2019-015871, together with English translation thereof. |
Number | Date | Country | |
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20200247128 A1 | Aug 2020 | US |