Patent Grant
11731427
This application claims the benefit of priority to Japanese Patent Application No. 2019-058324 filed on Mar. 26, 2019 and Japanese Patent Application No. 2019-114545 filed on Jun. 20, 2019. The entire contents of these applications are hereby incorporated herein by reference.
The present teaching relates to an ink jet printer and a non-transitory recording medium storing a computer program for cleaning.
JP2016-87858A discloses an ink jet printer including an ink head having nozzles from which ink is discharged. The ink jet printer disclosed in JP2016-87858A includes a cap unit in order to maintain discharge performance of the nozzles. The cap unit includes a cap attached to a nozzle surface where the nozzles of the ink head are in a printing standby mode, and a suction pump connected to the cap.
Attachment of the cap to the nozzle surface forms a closed space between the nozzle surface and the cap. When the suction pump is driven with the closed space formed, ink remaining in the ink head can be thereby ejected to the cap. This suction process for ejecting ink in the ink head will be referred to as a suction process.
After the suction process, in order to eject ink remaining in the cap, the suction pump is driven in a state where the nozzle surface is separated from the cap to make the closed space open to the atmosphere. With this driving, ink in the cap can be ejected without an excessive negative pressure on the ink head. This suction process for ejecting ink in the cap will be referred to as a free suction process.
In the ink jet printer described above, a negative pressure adjustment process is performed in some cases after the suction process. The negative pressure adjustment process refers to a process in which the suction pump is stopped for a predetermined time with the cap attached to the nozzle surface. Dirt attached to the nozzle surface or the like can be mixed in ink in the cap. Thus, the negative pressure adjustment process is performed for a longer time, ink including dirt or the like is more likely to flow back into the nozzles. Before the free suction process is performed, the cap is detached from the nozzle surface so as to separate the cap from the nozzle surface. In this detaching of the cap, a pressure difference occurs between the inside of the cap and the outside of the cap to cause ink in the cap to spatter in some cases.
Preferred embodiments of the present invention provide ink jet printers in each of which ink in a cap does not easily enter nozzles of an ink head and ink in the cap does not easily spatter, and also provide non-transitory recording media that each store a computer program to perform cleaning.
An ink jet printer according to a preferred embodiment of the present disclosure includes an ink head, a cap assembly, a memory, and a controller. The ink head includes a nozzle surface including first nozzles that discharge ink. The cap assembly includes a cap, a suction device, and a capping mechanism. The cap is attachable to the nozzle surface to cover the first nozzles and includes an end portion that is contactable with the nozzle surface when attached to the nozzle surface. The suction device is connected to the cap. The capping mechanism is attachable the cap to the nozzle surface and separate the cap from the nozzle surface. The memory stores a suction position, a free suction position, and a minute open position beforehand. The suction position is a position of the cap at which the end portion of the cap is in contact with the nozzle surface and ink in the first nozzles is sucked by the suction device. The free suction position is a position of the cap at which the end portion of the cap is separated from the nozzle surface and ink in the first nozzles is not sucked by the suction device. The minute open position is located between the suction position and the free suction position. The controller performs a suction process, a movement process, and a minute open position process. In the suction process, ink is sucked from the first nozzles with the cap located at the suction position. In the movement process, the cap is moved toward the minute open position after the suction process. In the minute open position process, movement of the cap is stopped with the cap located at the minute open position after the movement process.
Another ink jet printer according to a preferred embodiment of the present disclosure includes an ink head, a cap assembly, a memory, and a controller. The ink head includes a nozzle surface including first nozzles that discharge ink. The cap assembly includes a cap, a suction device, and a capping mechanism. The cap is attachable to the nozzle surface to cover the first nozzles and includes an end portion that is contactable with the nozzle surface when attached to the nozzle surface. The suction device is connected to the cap. The capping mechanism is attachable the cap to the nozzle surface and separate the cap from the nozzle surface. The memory stores a suction position, a free suction position, and a minute open position beforehand. The suction position is a position of the cap at which the end portion of the cap is in contact with the nozzle surface and ink in the first nozzles is sucked by the suction device. The free suction position is a position of the cap at which the end portion of the cap is separated from the nozzle surface and ink in the first nozzles is not sucked by the suction device. The minute open position is located between the suction position and the free suction position. The controller is configured or programmed to perform a suction process, a movement process, and a minute open position process. In the suction process, ink is sucked from the first nozzles with the cap located at the suction position. In the movement process, the cap is moved toward the minute open position after the suction process. In the minute open position process, movement of the cap is stopped and the suction device is stopped with the cap located at the minute open position, after the movement process.
In each of the ink jet printers described above, a negative pressure adjustment process as described above is not performed after the suction process, and the minute open position process is performed. In the suction process, a negative pressure is generated in the cap by driving the suction device. With the negative pressure generated in the cap, the cap is moved to the minute open position in the movement process and the minute open position process is performed. Immediately after the minute open position process is performed, the pressure in the cap is a negative pressure, and thus, ink in the cap is sucked. As described above, in each of the ink jet printers, no negative pressure adjustment process is performed, and the minute open position process in which ink in the cap is sucked is performed. Thus, the time necessary for the negative pressure adjustment process can be reduced so that a time having the possibility of entering of ink in the cap into the nozzle can be reduced. Accordingly, ink in the cap does not easily enter the nozzle. In each of the ink jet printers, at the minute open position at which the cap is located in the minute open position process, the end portion of the cap is closer to the nozzle surface than at the free suction position. Thus, the cap between the nozzle surface and the cap can be relatively small so that ink in the cap does not easily spatter to the outside.
The above and other elements, features, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings.
Preferred embodiment of ink jet printers according to the present disclosure will be described hereinafter with reference to the drawings. The preferred embodiments described here are, of course, not intended to particularly limit the present teaching. Elements, portions and features having the same functions are denoted by the same reference numerals, and description for the same elements, portions and features will not be repeated or will be simplified as appropriate.
The printer 100 is an ink jet printer. The printer 100 performs printing on the medium 5. The medium 5 is, for example, a rolled recording sheet. The medium 5 is, however, not limited to the rolled recording sheet, and may be a recording paper sheet, a sheet or film of a resin such as polyvinyl chloride or polyester, a plate material, a fabric such as a woven fabric or a nonwoven fabric, and other types of media.
As illustrated in
The printer body 11 includes a casing extending along the main scanning directions Y. The platen 13 supports the medium 5. The medium 5 is placed on the platen 13. Printing is performed on the platen 13. The platen 13 extends along the main scanning directions Y.
The medium 5 supported by the platen 13 is conveyed by the conveyance mechanism 20 along the sub-scanning directions X. The conveyance mechanism 20 is not limited to a specific configuration. In this preferred embodiment, the conveyance mechanism 20 includes pinching rollers 21, grit rollers 22, and feed motors 23. The pinching rollers 21 are located above the platen 13 and behind the carriage 17, and press the medium 5 from above. The grit rollers 22 are cylindrical members disposed in the platen 13. In this preferred embodiment, the grit rollers 22 are buried in the platen 13 with upper surface portions thereof exposed. The grit rollers 22 face the pinching rollers 21. In this preferred embodiment, the feed motors 23 are connected to the grit rollers 22. When the feed motors 23 are driven with the medium 5 sandwiched between the pinching rollers 21 and the grit rollers 22, the grit rollers 22 rotate. Accordingly, the medium 5 is conveyed along the sub-scanning directions X.
The guide rail 15 is disposed above the platen 13. The guide rail 15 is disposed in parallel or substantially in parallel with the platen 13 and extends along the main scanning directions Y. The carriage 17 is engaged with the guide rail 15. The carriage 17 is slidably disposed on the guide rail 15.
The head moving mechanism 30 causes the carriage 17 and the ink heads 41 through 44 (see
The ink heads 41 through 44 include nozzle surfaces 45. The nozzle surfaces 45 are provided at the lower surfaces of the ink heads 41 through 44. On the nozzle surface 45 of the first ink head 41, a plurality of nozzles 51 are arranged along the sub-scanning directions X, and a plurality of nozzles 52 are arranged along the sub-scanning directions X. Similarly, on the nozzle surface 45 of the second ink head 42, a plurality of nozzles 53 are arranged along the sub-scanning directions X, and a plurality of nozzles 54 are arranged along the sub-scanning directions X. On the nozzle surface 45 of the third ink head 43, a plurality of nozzles 55 are formed along the sub-scanning directions X, and a plurality of nozzles 56 are arranged along the sub-scanning directions X. On the nozzle surface 45 of the fourth ink head 44, a plurality of nozzles 57 are arranged along the sub-scanning directions X, and a plurality of nozzles 58 are arranged along the sub-scanning directions X. Lines of the plurality of nozzles 51 through 58 will be hereinafter referred to as nozzle lines 51a through 58a. Each of the ink heads 41 through 44 includes two nozzle lines. In this preferred embodiment, the nozzles 51 correspond to first nozzles, and the nozzles 52 correspond to second nozzles, for example.
The first ink tank 71a is a vessel storing ink. The first ink tank 71a stores one of, for example, a process color ink or a spot color ink (e.g., white ink or clear ink). Ink stored in the first ink tank 71a is not limited to a specific color. The ink is not limited to a specific material, either. Various materials conventionally used for ink for ink jet printers may be used. The ink may be a solvent-based pigment ink or an aqueous pigment ink, for example. Alternatively, the ink may be an aqueous dye ink or an ultraviolet-curable pigment ink that is cured upon application of ultraviolet rays, for example.
The first ink supply path 72a connects the first ink tank 71a and the first ink head 41 to each other. One end of the first ink supply path 72a is connected to the first ink head 41 through the first damper 74a. Specifically, one end of the first ink supply path 72a is connected to the nozzles 51 constituting the nozzle line 51a, and communicates with the nozzles 51. The other end of the first ink supply path 72a is connected to the first ink tank 71a. The nozzles 51 of the first nozzle line 51a discharge ink stored in the first ink tank 71a. The first ink supply path 72a is not limited to a specific material. The first ink supply path 72a includes, for example, a flexible tube.
The first liquid feed pump 73a is disposed on the first ink supply path 72a. The first liquid feed pump 73a supplies ink stored in the first ink tank 71a to the nozzles 51 of the nozzle line 51a, and adjusts the pressure to a pressure suitable for discharge of ink from the first ink head 41. In driving, the first liquid feed pump 73a feeds ink from the first ink tank 71a toward the nozzles 51 of the nozzle line 51a. The first liquid feed pump 73a is not limited to a specific type, and is, for example, a diaphragm pump or a tube pump.
The first damper 74a reduces a pressure variation of ink to stabilize an ink discharge operation of the first ink head 41. The first damper 74a detects a flow rate of ink flowing into the first damper 74a (i.e., pressure in the first damper 74a). Based on the detection result of the ink flow rate, the first liquid feed pump 73a is controlled. As illustrated in
The damper body 81 is hollow. The reservoir 82 is provided inside the damper body 81, and partially has an opening. The reservoir 82 temporarily stores ink. The reservoir 82 communicates with the first ink supply path 72a (see
As illustrated in
In this preferred embodiment, as illustrated in
The detection mechanism 84 detects a pressure in the reservoir 82. In this preferred embodiment, the detection mechanism 84 indirectly detects a pressure in the first ink supply path 72a (see
The filler 87 is disposed in the damper body 81 such that the filler 87 can contact the damper film 83 or the pressing body 86. In this preferred embodiment, the damper body 81 is provided with a support spring 89. The filler 87 is supported by the support spring 89. The filler 87 is not limited to a specific shape. The filler 87 herein has a substantially U shape. Specifically, the filler 87 includes a contact portion 87a extending along the front-rear directions at the right of the pressing body 86, a support portion 87b extending leftward from the rear of the contact portion 87a, and a detected portion 87c extending leftward from the front of the contact portion 87a. The contact portion 87a contacts the damper film 83 or the pressing body 86. The support portion 87b is supported by the support spring 89. The detected portion 87c is detected by the filler sensor 88.
The filler sensor 88 detects a pressure in the reservoir 82 by detecting the position of the filler 87. The filler sensor 88 indirectly detects a pressure of the first ink supply path 72a by detecting the pressure in the reservoir 82. The filler sensor 88 of the first damper 74a herein is an example of a pressure detection mechanism. In this preferred embodiment, the filler sensor 88 is a non-contact type sensor, but may be a contact-type sensor. In this preferred embodiment, the filler sensor 88 includes a pair of detectors 88a. As illustrated in
As illustrated in
In this preferred embodiment, as illustrated in
As illustrated in
In this preferred embodiment, the second ink tank 71b stores ink different from ink stored in the first ink tank 71a. The “different inks” herein refers to inks having different components. For example, “different inks” have different colors. However, even with the same color, if components of inks are different, these inks are defined as “different inks.” In this preferred embodiment, the nozzles 51 and the nozzles 52 discharge different inks. Alternatively, the nozzles 51 and the nozzles 52 may discharge the same ink. The ink stored in the second ink tank 71b is an example of another ink.
Although not specifically described, as illustrated in
Next, the cleaning system 90 will be described. As illustrated in
As illustrated in
In this preferred embodiment, the caps 111 through 114 have the same configuration. Thus, only the configuration of the cap 111 is described here, and the configurations of the caps 112 through 114 will not be described. As illustrated in
In this preferred embodiment, the cap assembly 110 includes absorbers 119. The absorbers 119 are disposed in the caps 111 through 114. The absorbers 119 herein are preferably located on the bottom surfaces of the caps 111 through 114. The absorbers 119 absorb ink in the caps 111 through 114. In this preferred embodiment, the absorbers 119 are housed in the caps 111 through 114, and upper ends of the absorbers 119 are located below the upper ends of the end portions 118. Thus, while the caps 111 through 114 are attached to the nozzle surfaces 45, the absorbers 119 are not in contact with the nozzle surfaces 45. The absorbers 119 are not limited to a specific type. The absorbers 119 are, for example, sponges.
As illustrated in
As illustrated in
In this preferred embodiment, as illustrated in
In the following description, a portion of the end portion 118 of the cap 111 located at the highest position will be referred to as an uppermost end 118a (see
As illustrated in
As illustrated in
The capping mechanism 120 is not limited to a specific configuration. In this preferred embodiment, the capping mechanism 120 includes a guide 123 with a guide hole 122 extending obliquely upward from the second position P2 toward the first position P1, and a support shaft 124 that is engaged with the guide hole 122 and disposed in the base 115. For example, the carriage 17 includes a contact portion (not shown) that contacts the base 115 between the second position P2 and the first position P1.
While the ink heads 41 through 44 move from the second position P2 to the first position P1, the contact portion of the carriage 17 pushes the base 115 toward the first position P1. At this time, the base 115 and the caps 111 through 114 move toward the nozzle surfaces 45 while being guided by the guide hole 122, and move from the second position P2 toward the first position P1. In this movement, the positions of the nozzle surfaces 45 of the ink heads 41 through 44 and the caps 111 through 114 change in the order of
As illustrated in
As illustrated in
The wiping mechanism 145 supports the wiper 141 and causes the wiper 141 to contact the nozzle surfaces 45 of the ink heads 41 through 44 and to be separated from the nozzle surfaces 45 of the ink heads 41 through 44. The wiping mechanism 145 includes a rotation shaft 146, a cleaning solution tank 147, and a rotation motor 148. The rotation shaft 146 supports and is connected to one end of the wiper 141. The wiper 141 is rotatable about the rotation shaft 146. The rotation shaft 146 extends along the front-rear directions. When the wiper 141 is located at a rotation position at which a distal end of the wiper 141 from the rotation shaft 146 is located above the other end, the distal end is located slightly higher than the nozzle surfaces 45 of the ink heads 41 through 44. In view of this, when the carriage 17 runs with the wiper 141 located at such a rotation position, the wiper 141 can wipe the nozzle surfaces 45 of the ink heads 41 through 44. On the other hand, when the wiper 141 is located at a rotation position at which the distal end of the wiper 141 from the rotation shaft 146 is located below the other end, the wiper 141 is immersed in a cleaning solution in the cleaning solution tank 147 disposed below the rotation shaft 146. The wiper 141 is rotated by the rotation motor 148.
In this preferred embodiment, the head moving mechanism 30 moves the ink heads 41 through 44 along the main scanning directions Y to move the ink heads 41 through 44 along the main scanning directions Y relative to the wiper 141.
Next, the memory 150 (see
In this preferred embodiment, the controller 160 is preferably configured or programmed to include a suction controller 162, a first movement controller 163, a minute open position controller 164, a second movement controller 165, a free suction controller 166, and a wiping controller 167. The components of the controller 160 described above may be defined by software or by hardware. For example, the components may be implemented by a processor or may be incorporated in a circuit. Specific control of the components of the controller 160 will be described later.
The configuration of the printer 100 according to this preferred embodiment has been described above. In performing cleaning on the ink heads 41 through 44, a free suction process is performed. In this preferred embodiment, free suction processes on the ink heads 41 through 44 are the same. Thus, the following description is directed to a free suction process on the ink head 41 and description on free suction processes on the ink head 42 through 44 will be omitted as appropriate.
In the free suction process, the suction pump 131 is driven with the cap 111 separated from the nozzle surface 45 of the ink head 41 so that ink in the cap 111 is sucked and ink in the nozzles 51 and 52 of the ink head 41 are not ejected to the cap 111. In performing the free suction process, the cap 111 can be filled with ink in some cases. Thus, if the free suction process is performed with an excessive gap left between the nozzle surface 45 of the ink head 41 and the cap 111, ink in the cap 111 might leak to the outside. In addition, in detaching the cap 111 from the nozzle surface 45 to which the cap 111 is attached, ink in the cap 111 might spatter to the outside.
In the following description, the gap between the nozzle surface 45 and the cap 111 refers to a distance between the nozzle surface 45 and a portion of the end portion 118 of the cap 111 farthest from the nozzle surface 45. In this preferred embodiment, ink discharged from the nozzles 51 and ink discharged from the nozzles 52 are mixed in the cap 111. The ink in cap 111 might contain dirt or the like attached to the nozzle surface 45. In the free suction process, a negative pressure state is maintained in the nozzles 51 and 52 of the ink head 41. Thus, if the gap between the nozzle surface 45 of the ink head 41 and the cap 111 excessively increases, a portion of ink in the cap 111 might be attached to the nozzle surface 45 at the time when the nozzle surface 45 is separated from the cap 111. The ink attached to the nozzle surfaces 45 is ink of a mixed color containing dirt. At this time, since the inside of the ink head 41 is at a negative pressure, the mixed ink adhering to the nozzle surfaces 45 might be sucked into the nozzles 51 and 52.
Although not directly related to the free suction process, even in a case where the cap between the nozzle surface 45 of the ink head 41 and the cap 111 is zero or excessively small (the cap 111 is completely attached to the nozzle surface 45 in this preferred embodiment), mixed ink in the cap 111 might be sucked into the nozzles 51 and 52. The expression “the cap 111 is completely attached to the nozzle surface 45” refers to a state where no gap is present between the nozzle surface 45 and the end portion 118 of the cap 111, illustrated in
For the foregoing reasons, if the free suction process is performed, it is preferable to use a configuration in which ink in the cap 111 does not easily spatter to the outside and mixed ink adhering to the nozzle surface 45 is not easily sucked into the nozzles 51 and 52. In view of this, in this preferred embodiment, a minute open position process is performed before the free suction process. This minute open position process will be described later.
In this preferred embodiment, the memory 150 stores a suction position P51 (see
The free suction position P52 illustrated in
The minute open position P53 illustrated in
In this preferred embodiment, the minute open position P53 is a position of the cap 111 when a portion of the end portion 118 (uppermost end 118a in this preferred embodiment) of the cap 111 is in contact with the nozzle surface 45 and the other portion of the end portion 118 (a portion of the end portion 118 except for the uppermost end 118a in this preferred embodiment) is separated from the nozzle surface 45. The expression “a portion of the end portions 118 is in contact” herein includes a state where a portion of the end portion 118 of the cap 111 is directly in contact with the nozzle surface 45 and a state where a portion of the end portion 118 of the cap 111 is indirectly in contact with the nozzle surface 45 through ink (e.g., liquid column of ink). At the minute open position P53, the uppermost end 118a of the cap 111 is in contact with the nozzle surface 45, but is not crushed by the nozzle surface 45. Alternatively, the uppermost end 118a may be crushed by the nozzle surface 45. In the case where the uppermost end 118a is crushed by the nozzle surface 45, another gap is preferably provided between the end portion 118 of the cap 111 and the nozzle surface 45. The minute open position P53 is a position adjusted to obtain a state at which at least a gap is provided between the nozzle surface 45 of the ink head 41 and the end portion 118 of the cap 111, ink in the cap 111 is sucked, ink is not sucked from the nozzles 51 and 52, and at least a portion of ink adhering to the nozzle surface 45 of the ink head 41 can be removed. The case where “ink is not sucked from the nozzles 51 and 52” herein includes a case where no ink is sucked from the nozzles 51 and 52 and a case where a small amount of ink is sucked from the nozzles 51 and 52.
In this preferred embodiment, the minute open position P53 is a position of the cap 111 at which the cap 111 is closest to the nozzle surface 45 among positions of the cap 111 at which ink cannot be sucked from the nozzles 51 and 52 of the ink head 41 in sucking ink in the cap 111. In other words, the minute open position P53 is a position of the cap 111 at which the cap 111 is at the highest position when ink in the nozzles 51 and 52 cannot be sucked among positions of the cap 111 relative to the nozzle surface 45 of the ink head 41. When the cap 111 is moved upward at least to a small extent from the state where the cap 111 is located at the minute open position P53, ink in the nozzles 51 and 52 can be sucked.
In this preferred embodiment, as illustrated in
In this preferred embodiment, the minute open position P53 is determined by the controller 160. As illustrated in
In this preferred embodiment, a process performed by the preprocess executor 180, the approach movement controller 181, the approach pressure determiner 182, the separation movement controller 183, the separation pressure determiner 184, and the position storage controller 185 is referred to as a “minute open position determination process.” The minute open position determination process herein is a process of determining the minute open position P53. The minute open position determination process is, for example, a process performed before the printer 100 is shipped or before a user uses the printer 100 for the first time.
Next, a procedure of the minute open position determination process will be described with reference to the flowcharts of
First, in step S101 in
Specifically, as the preprocess, the preprocess executor 180 determines whether the liquid feed pumps 73a and 73b are driven or not (step S1010). If the liquid feed pumps 73a and 73b are not driven, the liquid feed pumps 73a and 73b are driven (step S1011). In the following description, “control of driving of the liquid feed pumps” refers to control in which if the fillers 87 hit, the liquid feed pumps are automatically controlled to be driven (i.e., rotated) and otherwise, the liquid feed pump are automatically controlled to be in a standby state (e.g., a suspended state). The state of “controlling driving of the liquid feed pumps” refers to an automatic control state. Thereafter, the preprocess executor 180 determines whether the fillers 87 are unhit or not (step S1012). In this preferred embodiment, the liquid feed pumps 73a and 73b supply ink to the ink head 41 so that as illustrated in
If determination result in step S1012 is No, the preprocess executor 180 is kept on standby for a predetermined standby time (e.g., one second) (step S1013), and the determination in step S1012 is performed again. In step S1012, if the fillers 87 are determined to be unhit, the preprocess executor 180 stops driving of the liquid feed pumps 73a and 73b and closes the liquid feed pumps 73a and 73b (step S1014). In this preferred embodiment, the liquid feed pumps 73a and 73b are closed so that the ink supply paths 72a and 72b are thereby closed. Accordingly, when ink is sucked by driving of the suction pump 131 in step S1020 described later, it is possible to prevent a pressure decrease in the ink supply paths 72a and 72b caused by supply of ink from the ink tanks 71a and 71b to the ink supply paths 72a and 72b. The method for closing the ink supply paths 72a and 72b is not limited to closing of the liquid feed pumps 73a and 73b. For example, valves (not shown) disposed in the ink supply paths 72a and 72b may be closed, for example. Subsequently, the preprocess executor 180 moves the ink head 41 and the cap 111 to a predetermined position (step S1015). The predetermined position herein is a flashing position. The flashing position is a position at which flashing of discharging ink from the ink head 41 toward the cap 111, and is set between the first position P1 (see
As described above, after the preprocess in step S101 is finished, the minute open position determination process is performed. In this preferred embodiment, the minute open position determination process includes an approaching process (step S102) and a separating process (step S103). First, in step S102, the approaching process is executed. In this preferred embodiment, the approaching process includes an approach movement process and approach pressure determination process. The approach movement process is a process of moving the cap 111 in a direction in which the cap 111 is attached to the nozzle surface 45 in a state where the cap 111 is not attached to the nozzle surface 45 (state where the ink head 41 is at the flashing position in this preferred embodiment).
In the approach pressure determination process, while the approach movement process is performed, a first approach detection pressure that is a pressure in the first ink supply path 72a (see
In this preferred embodiment, an approaching process in step S102 is performed along steps S1020 through S1022. Specifically, first, the approach pressure determiner 182 drives the first suction pump 131 in a predetermined time (e.g., 10 seconds) (step S1020). Next, the approach pressure determiner 182 determines whether the filler 87 of at least one of the dampers 74a and 74b hits or not (step S1021). In step S1021, if the filler 87 of at least one of the dampers 74a and 74b hits, it is determined that at least one of the first approach detection pressure and the second approach detection pressure is less than or equal to the predetermined determination pressure. In step S1021, if the determination result is No, the approach movement controller 181 controls the head moving mechanism 30 such that the ink head 41 moves to a predetermined distance (e.g., 0.1 mm) toward the first position P1 (see
On the other hand, in step S1021, if it is determined that the filler 87 of at least one of the dampers 74a and 74b hits, the process proceeds to Yes, and the approaching process in step S102 is finished. In the manner described above, the reason why the filler 87 of at least one of the dampers 74a and 74b hits because ink is sucked from at least one of the nozzles 51 and 52 so that the pressure of at least one of the ink supply paths 72a and 72b varies. The state where ink in the ink head 41 is sucked can be a state where the cap 111 is attached to the nozzle surface 45 of the ink head 41.
Subsequently, in step S103 in
In the separation pressure determination process, while the separation movement process is performed, a first separation detection pressure that is a pressure in the first ink supply path 72a (see
The position storage process is a process in which a position of the cap 111 relative to the nozzle surface 45 when the first separation detection pressure is first determined to be higher than the predetermined determination pressure in the separation pressure determination process is stored in the memory 150 as the minute open position P53. In this preferred embodiment, in the position storage process, the position of the cap 111 relative to the nozzle surface 45 when the first separation detection pressure and the second separation detection pressure are first determined to be both higher than the predetermined determination pressure in the separation pressure determination process, the position of the cap 111 relative to the nozzle surface 45 is stored in the memory 150 as the minute open position P53. In this preferred embodiment, the separation movement controller 183 is configured or programmed to perform the separation movement process. The separation pressure determiner 184 is configured or programmed to perform the separation pressure determination process. The position storage controller 185 is configured or programmed to perform the position storage process.
In this preferred embodiment, the separating process in step S103 is performed along steps S1030 through S1036. Specifically, first, the separation pressure determiner 184 drives the liquid feed pumps 73a and 73b (step S1030), and is kept on standby for a predetermined time (e.g., three seconds) (step S1031). Thereafter, the separation pressure determiner 184 stops driving of the liquid feed pumps 73a and 73b and closes the liquid feed pumps 73a and 73b (step S1032). By performing these steps, the fillers 87 of the dampers 74a and 74b can be made unhit.
Then, the separation pressure determiner 184 drives the suction pump 131 for a predetermined time (e.g., 10 seconds) (step S1033). Subsequently, the separation pressure determiner 184 determines whether the fillers 87 of the dampers 74a and 74b hit or not, that is, whether fillers 87 change from the unhit state or not (step S1034). In this preferred embodiment, if the fillers 87 of the dampers 74a and 74b are unhit, it is determined that the first separation detection pressure and the second separation detection pressure are higher than the predetermined determination pressure. In step S1034, if the determination result is Yes, ink in the ink head 41 is sucked by the suction pump 131, and the amount of ink in the reservoir 82 is reduced. In this case, the separation movement controller 183 controls the head moving mechanism 30 such that the ink head 41 moves by a predetermined distance (e.g., about 0.1 mm) toward the second position P2 (see
On the other hand, in step S1034, if it is determined that the fillers 87 of the dampers 74a and 74b are unhit, ink in the ink head 41 is not sucked by the suction pump 131, and the amount of ink in the reservoir 82 does not change. In this case, the process proceeds to No, and in next step S1036, the position storage controller 185 causes the memory 150 to store a position of the cap 111 relative to the nozzle surface 45 of the ink head 41 at this time. The position storage controller 185 may cause the memory 150 to store a position of the ink head 41 in the main scanning directions Y. The position of the cap 111 herein is a position at which ink in the nozzles 51 and 52 are not sucked in the cap 111 anymore. The position of the cap 111 at this time is the minute open position P53.
In this preferred embodiment, “driving” of the suction pump may include not only a state where the suction pump is always driven but also a state where the suction pump is not temporarily driven, that is, is suspended. The “driving” of the suction pump includes a state where while the caps 111 through 114 are moving away from the nozzle surfaces 45, the suction pumps are stopped in at least a portion of the time or a suction power of the suction pump is changed as appropriate, for example. In this preferred embodiment, while the caps 111 through 114 move away from the nozzle surfaces 45, the suction pumps 131 through 134 are always driven. At this time, the suction pumps 131 through 134 are driven to maintain a maximum suction power. While the suction pumps 131 through 134 are driven, the suction power of the suction pumps 131 through 134 may change.
The minute open position determination process has been described above.
In this preferred embodiment, as shown in
First, in step S201 in
As described above, with the cap 111 being disposed at the suction position P51, the suction controller 162 drives the suction pump 131 so that a negative pressure is generated in the cap 111. The pressure in the cap 111 is not limited to a specific level, and is, for example, about −5 kPa or less. In this preferred embodiment, control by the suction controller 162 generates a negative pressure in the cap 111, and ink in the nozzles 51 and 52 of the ink head 41 is ejected into the cap 111. The ink ejected into the cap 111 is a mixed ink in which ink in the nozzles 51 and ink in the nozzles 52 are mixed.
In this preferred embodiment, after the suction process, a so-called negative pressure adjustment process is not performed, and processes in step S202 and subsequent steps are performed. The negative pressure adjustment process herein is a process in which the suction pump 131 is stopped for a predetermined time with the cap 111 attached to the nozzle surface 45 of the ink head 41.
After the suction process, in step S202 in
As illustrated in
In this preferred embodiment, while the first movement process is performed, the first movement controller 163 stops the suction pump 131. That is, while the first movement process is performed, ink in the cap 111 is not sucked by the suction pump 131. In step S201, however, since the negative pressure is generated in the cap 111, in the first movement process in step S202, a negative-pressure state is maintained in the cap 111. In the first movement process, the negative pressure is generated in the cap 111, and this negative pressure is less than or equal to a pressure in the suction process (e.g., about −5 kPa).
In addition, while the first movement process is performed, in moving the cap 111 toward the minute open position P53 by the first movement controller 163, the amount of movement of the cap 111 per a unit time is a first movement amount M1. In other words, the first movement controller 163 moves the cap 111 at a first speed. The movement amount of the cap 111 herein refers to the movement amount of a portion of the end portion 118 of the cap 111 that is first separated from the nozzle surface 45. The movement amount of the cap 111, however, is not limited to a reference portion for the movement amount. For example, the movement amount of the cap 111 may be a movement amount of a center portion of the cap 111, or a movement amount of the lowermost end of the cap 111.
After the first movement process is performed, in step S203 in
As a specific process of the minute open position process, the minute open position controller 164 drives the suction pump 131 with the cap 111 located at the minute open position P53, as illustrated in
In the minute open position process, ink in the cap 111 is sucked. In this preferred embodiment, in the case where mixed ink adheres to the nozzle surface 45, mixed ink adhering to the nozzle surface 45 connects to the ink in the cap 111 as described above, and thus, the mixed ink is sucked by the suction pump 131 together with the ink in the cap 111. Thus, mixed ink is not likely to remain on the nozzle surface 45.
After the minute open position process, in step S204 in
In the second movement process, while the cap 111 moves toward the minute open position P53, the entire end portion 118 of the cap 111 is not in contact with the nozzle surface 45, and the absorber 119 is not in contact with the nozzle surface 45, either. In this preferred embodiment, during the second movement process, the second movement controller 165 stops the suction pump 131. That is, during the second movement process, ink in the cap 111 is not sucked by the suction pump 131. Thus, an atmospheric pressure is generated in the cap 111.
During the second movement process, in moving the cap 111 toward the free suction position P52 by the second movement controller 165, the amount of movement of the cap 111 per a unit time is a second movement amount M2 (see
After the second movement process, in step S205 in
In free suction process, the free suction controller 166 drives the suction pump 131 as illustrated in
After the free suction process, in step S206 in
As described above, in this preferred embodiment, as illustrated in
In this preferred embodiment, after the suction process (step S201 in
In this preferred embodiment, the minute open position P53 at which the cap 111 is located in the minute open position process is a position at which the end portion 118 of the cap 111 is closer to the nozzle surface 45 than at the free suction position P52. Accordingly, the gap between the surface 45 and the cap 111 is relatively small so that ink in the cap 111 is not likely to spatter.
In this preferred embodiment, as illustrated in
In this preferred embodiment, the controller 160 stops the suction pump 131 as illustrated in
In this preferred embodiment, as illustrated in
In this preferred embodiment, as illustrated in
In this preferred embodiment, during the minute open position process, the controller 160 drives the suction pump 131 as illustrated in
In this preferred embodiment, during the minute open position process, the controller 160 keeps the cap 111 at the minute open position P53 for the predetermined time. At the minute open position P53, a minute gap is defined between the cap 111 and the nozzle surface 45, and the air is taken in the cap 111 through the minute gap. Thus, the state where the cap 111 is at the minute open position P53 is kept for the predetermined time so that the negative pressure in the cap 111 is easily canceled.
In this preferred embodiment, the controller 160 performs the second movement process of moving the cap 111 toward the free suction position P52 (step S204 in
In this preferred embodiment, at the minute open position P53, the absorber 119 is separated from the nozzle surface 45. If the absorber 119 is in contact with the nozzle surface 45, the nozzle surface 45 is scratched by the absorber 119, resulting in the possibility of a discharge failure of the nozzles 51 and 52. In this preferred embodiment, however, since the absorber 119 is not in contact with the nozzle surface 45, it is possible to reduce or eliminate scratching of the nozzle surface 45 by the absorber 119.
In this preferred embodiment, in the nozzles 51 and 52 in the nozzle surface 45 of the ink head 41, ink discharged from the nozzles 51 is different from ink discharged from the nozzles 52. As least after the minute open position process, the controller 160 separates the cap 111 from the nozzle surface 45 and performs the wiping process of wiping the nozzle surface 45 with the wiper 141. In this preferred embodiment, in the suction process, the cap 111 stores mixed ink as a mixture of two different types of inks sucked from the nozzles 51 and 52. In the minute open position process, mixed ink in the cap 111 is sucked with the cap 111 moved to the minute open position P53. In the minute open position process, even in a case where mixed ink adheres to the nozzle surface 45, for example, the mixed ink adhering to the nozzle surface 45 is easily sucked together with the mixed ink in the cap 111. Thus, in wiping the nozzle surface 45 in the wiping process, mixed ink does not easily enter the nozzles 51 and 52 of the ink head 41.
In this preferred embodiment, the controller 160 performs the minute open position determination process of determining the minute open position P53. The minute open position determination process includes the separation movement process, the separation pressure determination process, and the position storage process. For example, the suction pump 131 is driven with the cap 111 attached to the nozzle surface 45 of the ink head 41 so that ink in the ink head 41 is sucked and discharged into the cap 111. At this time, the pressures in the ink supply paths 72a and 72b for the ink head 41 decrease because of the discharge of ink, and reach a predetermined detection pressure or less. On the other hand, a case where the pressures in the ink supply paths 72a and 72b are higher than the predetermined detection pressure means a state where ink in the ink head 41 is not sucked. As described above, the position of the cap 111 relative to the nozzle surface 45 shifted from a case where ink in the ink head 41 is ejected by the suction pump 131 to a case where ink in the ink head 41 is not ejected by the suction pump 131 is a position at which ink in the cap 111 is sucked and ink in the nozzles 51 and 52 is not sucked, and a position at which the cap 111 is closest to the nozzle surface 45. In this preferred embodiment, by detecting the pressures in the ink supply paths 72a and 72b, it is possible to set a position at which ink in the cap 111 can be sucked with ink in the nozzles 51 and 52 not sucked, and the cap 111 is closest to the nozzle surface 45. This position is set as the minute open position P53, and the minute open position process is performed at the minute open position P53. Accordingly, entering of mixed ink into the ink head 41 is able to be reduced or prevented. In addition, since the cap 111 is relatively close to the nozzle surface 45, leakage of ink in the cap 111 to the outside is able to be reduced or prevented. As a result, the minute open position process can be appropriately performed.
In this preferred embodiment, before the separating process including the separation movement process and the separation pressure determination process (step S103 in
The dampers 74a and 74b illustrated in
The present preferred embodiment includes a computer program that causes a computer to execute the suction process, the first movement process, the minute open position process, the second movement process, the free suction process, and the wiping process performed by the controller 160, and a non-transitory recording medium storing the computer program. This preferred embodiment also includes a computer program to determine a minute open position to cause a computer to perform the minute open position determination process (specifically, the approach movement process, the approach pressure determination process, the separation movement process, the separation pressure determination process, and the position storage process) performed by the controller 160, and a non-transitory recording medium storing a computer program to determine a minute open position.
The ink jet printer 100 according to this preferred embodiment has been described. In the preferred embodiments described above, the suction pumps 131 through 134 are stopped in the first movement process in step S202 and the second movement process in step S204. Alternatively, in the first movement process, the first movement controller 163 may drive the suction pumps 131 through 134. In the second movement process, the second movement controller 165 may drive the suction pumps 131 through 134.
In the preferred embodiments described above, the suction pumps 131 through 134 are driven in the minute open position process in step S203. Alternatively, in the minute open position process, the suction pumps 131 through 134 may be stopped. Even in this case, the negative-pressure state in the cap 111 in the suction process and the first movement process is also kept in the minute open position process, and thus, ink in the cap 111 can be sucked. Thus, a so-called negative pressure adjustment process can be omitted so that a time having a possibility of entering of ink in the cap 111 into the nozzles 51 and 52 can be reduced. As a result, ink in the cap 111 does not easily enter the nozzles 51 and 52. In the minute open position process, to stop the suction pumps 131 through 134, the negative pressure in the cap 111 is preferably low (e.g., about a pressure in a normal suction process, e.g., about −50 kPa or less) or the free suction process in step S205 is preferably not omitted and is performed.
In the preferred embodiments described above, in the free suction process in step S205, the suction pumps 131 through 134 are driven. Alternatively, in the minute open position process in step S203, in a case where most of ink in the cap 111 (e.g., 90% or more of ink in the cap 111) is sucked, the free suction controller 166 preferably stops the suction pumps 131 through 134. In the minute open position process in step S203, in the case where most of the ink in the cap 111 is sucked, the second movement process in step S204 and the free suction process in step S205 may be omitted. In this case, the minute open position process includes a free suction process.
In the preferred embodiments described above, by tilting the cap 111 itself, the cap 111 moves between the suction position P51 and the minute open position P53 and between the minute open position P53 and the free suction position P52, with the end portion 118 of the cap 111 tilted. Alternatively, as described in another preferred embodiment shown in
In the preferred embodiments described above, at the minute open position P53, a portion of the end portion 118 of the cap 111 (the uppermost end 118a in this preferred embodiment) is in contact with the nozzle surface 45 and the other portion of the end portion 118 is separated from the nozzle surface 45. Alternatively, at the minute open position P53, the uppermost end 118a of the end portion 118 of the cap 111 may not be in contact with the nozzle surface 45, and a slight gap may be defined between the uppermost end 118a and the nozzle surface 45.
In the preferred embodiments described above, one ink head discharges different types of inks. One ink head is connected to two ink supply systems. Alternatively, one ink head may discharge the same type of ink. One ink head may be connected to one ink supply system.
In the preferred embodiments described above, the capping mechanism 120 lifts and lowers the caps 111 through 114 in conjunction with the head moving mechanism 30. Alternatively, the capping mechanism according to a preferred embodiment of the present disclosure may include a driving motor to lift and lower the caps 111 through 114 by driving this driving motor. The capping mechanism according to a preferred embodiment of the present disclosure may be configured such that the caps 111 through 114 are lifted and lowered at the first position P1 after the ink heads 41 through 44 have reached the first position P1.
In the preferred embodiments described above, after the approaching process (step S102 in
In the preferred embodiments described above, in the approach pressure determination process (control of the approach pressure determiner 182 in the preferred embodiment), it is determined whether at least one of the first approach detection pressure and the second approach detection pressure is less than or equal to the determination pressure or not. In the separation movement process (control of the separation movement controller 183 in this preferred embodiment), if at least one of the first approach detection pressure and the second approach detection pressure is less than or equal to the determination pressure, the caps 111 through 114 are moved in the direction in which the caps 111 through 114 are separated from the nozzle surfaces 45. Alternatively, the approach pressure determiner 182 may determine whether both of the first approach detection pressure and the second approach detection pressure are less than or equal to the determination pressure or not. In this case, if the approach pressure determiner 182 determines that both the first approach detection pressure and the second approach detection pressure are less than or equal to the determination pressure, the separation movement controller 183 moves the caps 111 through 114 in the direction in which the caps 111 through 114 are separated from the nozzle surfaces 45.
In the preferred embodiments described above, the first pressure detection mechanism and the second pressure detection mechanism according to a preferred embodiment of the present disclosure are the filler sensors 88 of the dampers 74a and 74b. Alternatively, the first pressure detection mechanism and the second pressure detection mechanism may be so-called pressure sensors disposed in the ink supply paths 72a and 72b.
While preferred embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present invention. The scope of the present invention, therefore, is to be determined solely by the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2019-058324 | Mar 2019 | JP | national |
| 2019-114545 | Jun 2019 | JP | national |
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| Number | Date | Country | |
|---|---|---|---|
| 20200307220 A1 | Oct 2020 | US |
