CN109318597B - Image recording apparatus - Google Patents

Abstract

The invention provides an image recording apparatus. The sum of a flow path resistance value when the atmospheric air flows through a flow path extending from a through hole of the ink cartridge to the atmospheric air communication port and a flow path resistance value when the ink flows to the ink supply unit is set as a first flow path resistance value. The flow resistance value of the flow path extending from the through hole in the front wall of the tank to the atmosphere communication port is set as a second flow resistance value. The space between the level at the position P2 and the level at the position P1 is defined as a space Q in the tank. In the reservoir of the ink cartridge, the average cross-sectional area of the space included in the space Q in the horizontal direction is set to the first average cross-sectional area S1. In the storage chamber of the tank, the average cross-sectional area along the horizontal direction of the space included in the space Q is set to the second average cross-sectional area S2. The value obtained by dividing the first average cross-sectional area S1 by the second average cross-sectional area S2 is defined as the cross-sectional area ratio a. The second flow resistance value R2 is greater than the value a · R1 obtained by multiplying the first average flow resistance value R1 by the cross-sectional area ratio a.

Description

Image recording apparatus

Technical Field

The present invention relates to an image recording apparatus including a cartridge having a first reservoir and a cartridge mounting portion having a second reservoir.

Background

Conventionally, a liquid discharge device is known which includes: an apparatus main body having a liquid ejection head and a sub tank; and an ink cartridge that has a liquid storage chamber and is detachable from the apparatus main body (see patent document 1). A sensor arm is provided in the liquid storage chamber of the cartridge. When the liquid level of the ink in the liquid storage chamber is equal to or lower than a predetermined height, the sensor arm rotates. The device main body is provided with a remaining amount detection sensor. The remaining amount detection sensor outputs different detection signals according to the rotational position of the sensor arm. A control unit of the liquid ejecting apparatus determines the remaining amount of ink in a liquid reservoir of the cartridge based on a detection signal of a remaining amount detection sensor. When the ink in the liquid storage chamber of the cartridge is consumed and the remaining amount of ink is determined to be equal to or less than a predetermined amount, the control unit notifies that the cartridge is replaced with a new one.

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. 2008-238792

Disclosure of Invention

Problems to be solved by the invention

When the ink flows out from the sub tank, the ink flows from the liquid storage chamber of the cartridge to the sub tank. When both the sub tank and the liquid storage chamber are opened to the atmosphere, the liquid level of the ink in the sub tank and the liquid level of the ink in the liquid storage chamber of the cartridge eventually become the same height. However, when ink is ejected from the recording head, if the flow path resistances of the sub tank and the liquid storage chamber are neglected approximately, the same amount of ink flows out from the sub tank and the liquid storage chamber. Therefore, when the shapes of the sub tank and the liquid storage chamber are different, the ink liquid level lowering speed is different. In this case, the height of the liquid surface of the ink in the sub tank is different from the height of the liquid surface of the ink in the liquid storage chamber.

For example, it is assumed that the control unit counts the number of ink droplets ejected from the recording head after determining that the remaining amount of ink is equal to or less than a predetermined amount based on a detection signal of the remaining amount detection sensor, and calculates the amount of ink consumed thereafter. When the liquid level of the ink in the sub tank and the liquid level of the ink in the liquid storage chamber of the cartridge are at the same height, if the control unit determines that the remaining amount of the ink is equal to or less than a predetermined amount, the remaining amount of the ink actually remaining in the sub tank and the liquid storage chamber immediately after the determination is set as a determination reference amount. When the liquid level of the ink in the sub tank and the liquid level of the ink in the liquid storage chamber of the cartridge are different in height, immediately after the control unit determines that the remaining amount of the ink is equal to or less than the predetermined amount, the remaining amount of the ink actually remaining in the sub tank and the liquid storage chamber is different from the determination reference amount.

As a result, if the actual remaining amount of ink is smaller than the determination reference amount, the ink in the sub tank and the liquid storage chamber may run out and the air may enter the recording head before the control unit notifies the replacement of the cartridge. On the other hand, if the actual remaining amount of ink is larger than the determination reference amount, the control unit notifies the replacement of ink, although usable ink remains in the sub tank or the liquid storage chamber.

The present invention has been made in view of the above circumstances, and an object thereof is to suppress the possibility of atmospheric air entering from a second reservoir into a recording unit in an image recording apparatus including a cartridge having a first reservoir and a cartridge mounting portion having a second reservoir.

Means for solving the problems

(1) An image recording apparatus of the present invention includes: a cartridge having a first reservoir for storing a liquid, a first atmosphere communication portion for communicating the first reservoir with an atmosphere, and a supply portion for supplying the liquid stored in the first reservoir; a cartridge mounting portion having a connecting portion connectable to the supply portion, and a tank having an inflow port through which the liquid flows from the first reservoir chamber through the supply portion connected to the connecting portion, a second reservoir chamber in which the liquid flowing in through the inflow port is stored, a second atmosphere communicating portion through which the second reservoir chamber communicates with the atmosphere, and an outflow port through which the liquid stored in the second reservoir chamber flows out; and a recording unit configured to discharge the liquid, which has flowed out of the second reservoir through the outlet, from the nozzle. A second flow path resistance value R2 is larger than a value a · R1 obtained by multiplying a first flow path resistance value R1 by a cross-sectional area ratio a, the second flow path resistance value R2 is a flow path resistance value when atmospheric air flows through the second atmosphere communication portion, the first flow path resistance value R1 is a sum of a flow path resistance value when atmospheric air flows through the first atmosphere communication portion and a flow path resistance value when liquid flows to the supply portion, and the cross-sectional area ratio a is a cross-sectional area ratio obtained by dividing a first average cross-sectional area of a first space containing at least a vicinity of the supply portion in which liquid is stored in the first reservoir by a second average cross-sectional area of a second space at the same height as the first space in a space in which liquid is stored in the second reservoir.

When the liquid is supplied from the outlet port to the recording unit and flows out from the first reservoir and the second reservoir, the liquid surface of the liquid in the first space of the first reservoir falls faster than the liquid surface of the liquid in the second space of the second reservoir, because the second flow resistance value R2 is larger than the value a · R1. This can suppress the following: the liquid in the second reservoir is exhausted earlier than the first reservoir, and the atmosphere enters the recording unit from the outflow port.

(2) Preferably, the second reservoir has a first portion and a second portion located above the first portion and having a smaller cross-sectional area than the first portion, and the second space is a space from a boundary between the first portion and the second portion to the connection portion among the spaces of the second reservoir.

(3) Preferably, a flow path resistance value when the atmosphere flows through the first atmosphere communication portion is a flow path resistance value in a state where the cartridge is mounted on the cartridge mounting portion.

(4) Preferably, the second space is a space including a vicinity of the connection portion, and the image recording apparatus further includes: a detection unit that detects that a liquid surface is located in the vicinity of the connection portion in the second reservoir; and a control unit for determining that there is no remaining amount of the liquid in the first reservoir based on a detection signal of the detection unit, and notifying replacement of the cartridge.

According to the above configuration, since the liquid in the first reservoir is preferentially supplied to the recording unit, the following does not occur: the liquid level in the second storage chamber first drops and the liquid level is detected by the detection unit, although the first storage chamber has a remaining amount of liquid.

(5) Preferably, the flow path of the second atmosphere communication portion is sealed by a semipermeable membrane.

According to the above configuration, the flow path resistance value can be easily adjusted by changing the gas permeability of the semipermeable membrane or changing the area of the semipermeable membrane.

(6) Preferably, the flow path of the first atmosphere communication portion is sealed by a semipermeable membrane.

According to the above configuration, the flow path resistance value can be easily adjusted by utilizing the difference between the semipermeable membranes by changing the gas permeability of the semipermeable membranes or changing the area of the semipermeable membranes.

(7) Preferably, the outlet is located below the supply unit in a gravity direction.

(8) Preferably, the supply unit includes a valve for opening and closing a liquid flow path, and the connection unit includes a pipe body which is brought into contact with the valve and enters the liquid flow path to communicate an internal space with the liquid flow path.

(9) Preferably, the pipe body as the connecting portion extends in a horizontal direction.

(10) An image recording system of the present invention includes: a cartridge having a first reservoir for storing a liquid, a first atmosphere communication portion for communicating the first reservoir with an atmosphere, and a supply portion for supplying the liquid stored in the first reservoir; and an image recording device including a recording unit configured to eject the liquid supplied from the supply unit of the cartridge from a nozzle. The image recording apparatus includes a cartridge mounting portion having a connecting portion connectable to the supply portion, and a tank having an inlet through which the liquid flows from the first reservoir chamber through the supply portion connected to the connecting portion, a second reservoir chamber in which the liquid flowing through the inlet is stored, a second atmosphere communicating portion that communicates the second reservoir chamber with the atmosphere, and an outlet through which the liquid stored in the second reservoir chamber flows out. The recording unit discharges the liquid, which has flowed out of the second reservoir through the outflow port, from the nozzle. A second flow path resistance value R2 is larger than a value a · R1 obtained by multiplying a first flow path resistance value R1 by a cross-sectional area ratio a, the second flow path resistance value R2 is a flow path resistance value when atmospheric air flows through the second atmosphere communication portion, the first flow path resistance value R1 is a sum of a flow path resistance value when atmospheric air flows through the first atmosphere communication portion and a flow path resistance value when liquid flows to the supply portion, and the cross-sectional area ratio a is a cross-sectional area ratio obtained by dividing a first average cross-sectional area of a first space containing at least the vicinity of the supply portion, in which liquid is stored in the first reservoir, by a second average cross-sectional area of a second space at the same height as the first space, in which liquid is stored in the second reservoir.

Effects of the invention

According to the present invention, the possibility of the atmosphere entering the recording portion from the second reservoir can be suppressed.

Drawings

Fig. 1 is an external perspective view of the mfp 10, where (a) shows a state where the cover 87 is in the closed position, and (B) shows a state where the cover 87 is in the open position.

Fig. 2 is a longitudinal sectional view schematically showing the internal structure of the printer section 11.

Fig. 3 is a plan view showing the arrangement of the carriage 22 and the platen 26.

Fig. 4 is an external perspective view of the cartridge mounting portion 110 on the opening 112 side.

Fig. 5 is an external perspective view of the cartridge mounting portion 110 on the can 103 side.

Fig. 6 is a longitudinal sectional view of a state where the ink cartridge 30 is mounted on the cartridge mounting portion 110.

Fig. 7 is a front perspective view of the ink cartridge 30.

Fig. 8 is a block diagram showing the configuration of the control unit 130.

Detailed Description

Hereinafter, embodiments of the present invention will be described. It should be noted that the embodiments described below are merely examples of the present invention, and it is needless to say that the embodiments of the present invention can be appropriately modified within a range not changing the gist of the present invention. The vertical direction 7 is defined with reference to an attitude (the attitude in fig. 1 is sometimes referred to as a "use attitude") in which the multifunction peripheral 10 is disposed on a horizontal plane so as to be usable, the front-rear direction 8 is defined with reference to a front surface of the multifunction peripheral 10 on which the opening 13 is provided, and the left-right direction 9 is defined with reference to a front surface of the multifunction peripheral 10. In the present embodiment, the vertical direction 7 corresponds to the vertical direction, and the front-rear direction 8 and the left-right direction 9 correspond to the horizontal direction in the use posture. The front-back direction 8 and the left-right direction 9 are orthogonal.

[ Overall Structure of Complex machine 10]

As shown in fig. 1, the mfp 10 (an example of an image recording apparatus) has a substantially rectangular parallelepiped shape. The mfp 10 includes a printer section 11 for recording an image on a sheet 12 (see fig. 2) by an inkjet recording method in a lower portion. The printer section 11 has a housing 14 having an opening 13 formed in a front surface 14A.

As shown in fig. 2, a feed roller 23, a feed tray 15, a discharge tray 16, a pair of transport rollers 25, a recording section 24, a pair of discharge rollers 27, a platen 26, and a cartridge mounting section 110 are disposed inside the housing 14 (see fig. 1B). The multifunction peripheral 10 has various functions such as a facsimile function and a printer function. The state shown in fig. 1 is a usage posture of the mfp 10.

[ feed tray 15, discharge tray 16, feed roller 23]

As shown in fig. 1, the feeding tray 15 is inserted into and removed from the mfp 10 along the front-rear direction 8 through the opening 13 by the user. The opening 13 is located at the center portion in the left-right direction 9 in the front surface 14A of the housing 14. As shown in fig. 2, the feeding tray 15 can support a plurality of stacked sheets 12.

The discharge tray 16 is disposed above the feed tray 15. The discharge tray 16 supports the sheet 12 discharged from between the recording portion 24 and the platen 26 by the discharge roller pair 27.

The feeding roller 23 feeds the sheet 12 supported by the feeding tray 15 to the conveying path 17. The feeding roller 23 is driven by a feeding motor 172 (see fig. 8).

[ conveying path 17]

As shown in fig. 2, the conveyance path 17 is a space formed by an outer guide member 18 and an inner guide member 19, which are partially opposed to each other at a predetermined interval, in the printer section 11. The conveyance path 17 is a path extending upward from the rear portion of the feeding tray 15, making a U-turn forward, passing through a space between the recording unit 24 and the platen 26, and reaching the discharge tray 16. The conveyance path 17 between the conveyance roller pair 25 and the discharge roller pair 27 is provided at a substantially central portion of the mfp 10 in the left-right direction 9, and extends in the front-rear direction 8. The conveyance direction of the sheet 12 in the conveyance path 17 is indicated by an arrow of a single-dot chain line in fig. 2.

[ conveying roller pair 25]

As shown in fig. 2, the conveying roller pair 25 is disposed on the conveying path 17. The conveying roller pair 25 includes a conveying roller 25A and a pinch roller 25B facing each other. The conveyance roller 25A is driven by a conveyance motor 171 (see fig. 8). The pinch roller 25B rotates in tandem with the rotation of the conveyance roller 25A. The sheet 12 is conveyed in the conveyance direction (forward) while being nipped by the conveyance roller 25A and the pinch roller 25B, which are rotated in the normal direction by the conveyance motor 171.

[ discharge roller pair 27]

As shown in fig. 2, the discharge roller pair 27 is disposed downstream of the transport roller pair 25 in the transport direction on the transport path 17. The discharge roller pair 27 has a discharge roller 27A and a taker-in roller 27B facing each other. The discharge roller 27A is driven by a conveyance motor 171 (see fig. 8). The taker-in roller 27B rotates in conjunction with the rotation of the discharge roller 27A. The sheet 12 is conveyed in the conveyance direction (forward) while being nipped between the discharge roller 27A and the spur roller 27B, which are rotated in the normal direction by the conveyance motor 171.

[ recording section 24]

As shown in fig. 2, the recording portion 24 is disposed between a conveying roller pair 25 and a discharge roller pair 27 on the conveying path 17. The recording section 24 is disposed opposite to the platen 26 in the vertical direction 7 with the conveyance path 17 therebetween. The recording unit 24 includes a carriage 22 and a recording head 21.

As shown in fig. 3, the carriage 22 is supported at positions separated in the front-rear direction 8 by guide rails 82, 83 extending in the left-right direction 9, respectively. The guide rails 82 and 83 are supported by a frame of the printer section 11. The carriage 22 is coupled to a known belt mechanism provided on the guide rail 83. The belt mechanism is driven by a carriage driving motor 173 (see fig. 8). The carriage 22 connected to the belt mechanism reciprocates in the left-right direction 9 by driving of a carriage driving motor 173. As shown by the one-dot chain line in fig. 3, the movement range of the carriage 22 reaches the right and left of the conveyance path 17.

The ink tube 20 and the flexible flat cable 84 extend from the carriage 22.

The ink tube 20 connects the cartridge mounting portion 110 (see fig. 1(B)) to the recording head 21. The ink tube 20 supplies ink (an example of liquid) accumulated in each ink cartridge 30 (an example of a cartridge) mounted in the cartridge mounting portion 110 to the recording head 21. Four ink tubes 20 through which ink of respective colors (black, magenta, cyan, and yellow) flows are provided corresponding to the respective ink cartridges 30, and are connected to the carriage 22 in a bundled state.

The flexible flat cable 84 electrically connects the control unit 130 (see fig. 8) and the recording head 21. The flexible flat cable 84 transmits a control signal output from the control unit 130 to the recording head 21.

As shown in fig. 2, the carriage 22 mounts the recording head 21. The recording head 21 includes a plurality of nozzles 29 disposed on a lower surface thereof, and a piezoelectric element 45 (see fig. 8) for ejecting ink droplets from the nozzles 29 by deforming a portion of an ink flow path formed in the recording head 21. As described later, the piezoelectric element 45 operates by power supply from the control unit 130.

The recording unit 24 is controlled by the control unit 130. When the carriage 22 moves in the left-right direction 9, the recording head 21 ejects ink droplets from the nozzles 29 toward the paper 12 supported on the platen 26. Thereby, an image is recorded on the sheet 12. Then, the ink accumulated in each ink cartridge 30 is consumed.

[ Table plate 26]

As shown in fig. 2 and 3, the platen 26 is disposed between the pair of transport rollers 25 and the pair of discharge rollers 27 on the transport path 17. The platen 26 is disposed opposite to the recording section 24 in the vertical direction 7 with the conveyance path 17 therebetween. The platen 26 supports the sheet 12 conveyed by the conveying roller pair 25 from below.

[ cover 87]

As shown in fig. 1(B), an opening 85 is formed in the right portion of the front surface 14A of the housing 14. A housing space 86 capable of housing the cartridge mounting portion 110 is formed behind the opening 85. The cover 87 is attached to the housing 14 so as to cover the opening 85. The cover 87 is rotatable about a rotation axis 87A (rotation center) extending in the left-right direction 9 between a closing position (a position shown in fig. 1 a) for closing the opening 85 and an opening position (a position shown in fig. 1B) for opening the opening 85.

[ Box Assembly part 110]

As shown in fig. 4 to 6, the cartridge mounting portion 110 includes a cartridge case 101, a connecting portion 107, a contact 106, a lever 125, a mounting sensor 113, a lock portion 145, a tank 103, and a liquid level sensor 55 (an example of a detection portion). The cartridge mounting portion 110 can house four ink cartridges 30 corresponding to the colors cyan, magenta, yellow, and black, respectively. The connection portion 107, the contact 106, the lever 125, the attachment sensor 113, the lock portion 145, the tank 103, and the liquid level sensor 55 are provided in four numbers corresponding to the four ink cartridges 30, respectively. The number of ink cartridges 30 that can be accommodated in the cartridge mounting portion 110 is not limited to four.

[ case 101]

As shown in fig. 4 and 5, the cartridge case 101 forming the casing of the cartridge mounting portion 110 has a box shape having: a top surface defining a top of the internal space of the cartridge case 101; a bottom surface defining a bottom of the internal space of the cartridge case 101; a finish joining the top and bottom; and an opening 112 provided at a position facing the final surface in the front-rear direction 8. The opening 112 can be exposed to the front surface 14A of the housing 14, which is the surface that the user faces when using the multifunction device 10.

The ink cartridge 30 is inserted into and removed from the cartridge case 101 through the opening 85 of the case 14 and the opening 112 of the cartridge mounting portion 110. The ink cartridge 30 is guided in the front-rear direction 8 in fig. 4 by inserting the lower end portion of the ink cartridge 30 into a guide groove 109 provided in the bottom surface of the internal space of the cartridge case 101. The cartridge case 101 is provided with three plates 104 that partition the internal space into four spaces that are long in the up-down direction 7. The ink cartridges 30 are respectively accommodated in the respective spaces partitioned by the plate 104.

[ connecting part 107]

As shown in fig. 4, the connection portion 107 includes the ink needle 102 and the guide portion 105.

The ink needle 102 (an example of a connecting portion or a tube body) is made of tubular resin and is located below the end surface of the cartridge case 101. The ink needles 102 are disposed at positions corresponding to the ink supply portions 34 (an example of a supply portion) of the ink cartridges 30 mounted on the cartridge mounting portion 110 on the end surface of the cartridge case 101. The ink needle 102 horizontally protrudes forward from the end surface of the cartridge case 101.

The guide portion 105 is disposed around the ink needle 102 and has a cylindrical shape. The guide portion 105 protrudes forward from the end surface of the cartridge case 101, and the protruding end thereof is opened. The ink needle 102 is disposed at the center of the guide portion 105. The guide portion 105 is shaped to allow the ink supply portion 34 of the ink cartridge to enter the inside.

In a state where the ink cartridge 30 is not mounted on the cartridge mounting portion 110, the connection portion 107 is not connected to the ink supply portion 34 of the ink cartridge 30. On the other hand, during the insertion of the ink cartridge 30 into the cartridge mounting portion 110, that is, during the movement of the ink cartridge 30 to the mounting position (the position shown in fig. 6), the ink supply portion 34 of the ink cartridge 30 enters the guide portion 105. When the ink cartridge 30 is further inserted into the cartridge mounting portion 110, the ink needle 102 is inserted into the ink supply port 71 formed in the ink supply portion 34. Thereby, the connection portion 107 is connected to the ink supply portion 34. The ink stored in the storage chamber 33 formed inside the ink cartridge 30 flows out to the tank 103 through the ink valve chamber 35 formed inside the ink supply unit 34 and the internal space 117 of the ink needle 102. The tip of the ink needle 102 may be flat or sharp.

As shown in fig. 6, the valve 114 and the coil spring 115 are housed in the internal space 117 of the ink needle 102. The valve 114 opens and closes an opening 116 formed in the protruding distal end portion of the ink needle 102 by moving in the front-rear direction 8. That is, the valve 114 opens and closes the internal space 117 of the ink needle 102. The coil spring 115 biases the valve 114 forward. Therefore, in a state where external force is not applied (a state where the ink cartridge 30 is not mounted in the cartridge mounting portion 110), the valve 114 closes the opening 116. In a state where no external force is applied, the tip end portion of the valve 114 biased by the coil spring 115 protrudes forward beyond the opening 116. During the connection of the connection portion 107 to the ink supply portion 34, the valve 114 opens the opening 116. The operation of the valve 114 to open the opening 116 will be described later.

[ contact 106]

As shown in fig. 6, four contacts 106 are provided on the top surface of the cartridge case 101. The four contacts 106 protrude downward from the top surface toward the internal space of the cartridge case 101. Although not shown in detail in the drawings, the four contacts 106 are arranged apart from each other in the left-right direction 9. The arrangement of the four contacts 106 corresponds to the arrangement of the four electrodes 65 of the ink cartridge 30 described later. Each contact 106 is made of a conductive and elastic member and is elastically deformable upward. Four contacts 106 are provided in four sets corresponding to the four ink cartridges 30 that can be accommodated in the cartridge case 101. The number of the contacts 106 and the number of the electrodes 65 are arbitrary.

Each contact 106 is electrically connected to the control unit 130 (see fig. 8) via an electric circuit. By electrically connecting the contact 106 with the corresponding electrode 65, the voltage Vc is applied to the electrode 65, the electrode 65 is grounded, or power is supplied to the electrode 65. The data stored in the IC of the ink cartridge 30 can be accessed by electrical conduction of the contacts 106 to the corresponding electrodes 65. The output from the circuit is input to the control unit 130.

[ rod 125]

As shown in fig. 6, a lever 125 is formed above the ink needle 102 on the end surface of the cartridge case 101. The lever 125 projects forward from the end surface of the cartridge case 101. The rod 125 is cylindrical in shape. In a state where the ink cartridge 30 is mounted to the cartridge mounting portion 110, that is, in a state where the ink cartridge 30 is located at the mounting position, the lever 125 is inserted into the air communication port 96 described later.

[ Assembly sensor 113]

As shown in fig. 6, a mount sensor 113 is disposed on the top surface of the cartridge case 101. The attachment sensor 113 detects whether the ink cartridge 30 is attached to the cartridge attachment portion 110. The attachment sensor 113 is located forward of the rod 125 and rearward of the contact 106. In the present embodiment, the mount sensor 113 includes a light emitting portion and a light receiving portion. The light emitting section is provided on the right or left of the light receiving section with a space therebetween. The light shielding plate 67, which will be described later, of the ink cartridge 30 that has been mounted on the cartridge mounting portion 110 is disposed between the light emitting portion and the light receiving portion. In other words, the light emitting unit and the light receiving unit are disposed facing each other through the light shielding plate 67 of the ink cartridge 30 mounted to the cartridge mounting unit 110.

The mount sensor 113 outputs different detection signals depending on whether or not light emitted from the light emitting portion in the left-right direction 9 is received by the light receiving portion. For example, the mount sensor 113 outputs a low-level signal to the control unit 130 (see fig. 8) on the condition that the light output from the light emitting unit is not received by the light receiving unit (i.e., the received light intensity is less than a predetermined intensity). On the other hand, the mount sensor 113 outputs a high-level signal to the control unit 130 (see fig. 8) on the condition that the light output from the light emitting unit is successfully received by the light receiving unit (that is, the received light intensity is equal to or higher than a predetermined intensity).

[ locking part 145]

As shown in fig. 6, the lock portion 145 extends in the left-right direction 9 of the cartridge case 101 near the top surface of the cartridge case 101 and near the opening 112. The locking portion 145 is a rod-like member extending in the left-right direction 9. The locking portion 145 is, for example, a metal cylinder. Both ends in the left-right direction 9 of the lock portion 145 are fixed to a wall that defines both ends in the left-right direction 9 of the cartridge case 101. The lock portion 145 extends in the left-right direction 9 so as to span four spaces in which the four ink cartridges 30 can be housed.

The lock portion 145 is for holding the ink cartridge 30 mounted to the cartridge mounting portion 110 at the mounting position. The ink cartridge 30 is engaged with the lock portion 145 in a state of being mounted on the cartridge mounting portion 110. Thus, the lock portion 145 holds the ink cartridge 30 in the cartridge mounting portion 110 against the force of the coil springs 78, 98 of the ink cartridge 30 pushing the ink cartridge 30 forward.

[ tank 103]

As shown in fig. 4 to 6, a tank 103 is provided at the rear of the cartridge case 101. The tank 103 has a box shape having a storage chamber 121 (an example of a second storage chamber) and a buffer chamber 122 inside. The reservoir 121 and the buffer chamber 122 are arranged in the vertical direction 7 such that the buffer chamber 122 is located above. The reservoir 121 (an example of the first portion) and the buffer chamber 122 communicate with each other through a flow passage 123 (an example of the second reservoir and the second portion) extending in the vertical direction 7. The reservoir 121 extends further forward than the flow passage 123. The storage chamber 121, the buffer chamber 122, and the flow path 123 are spaces defined by the outer wall of the tank 103. The cross-sectional area of the reservoir 121 in the horizontal direction is substantially rectangular and is larger than the cross-sectional area of the flow path 123 in the horizontal direction.

The reservoir 121 communicates with the internal space of the ink needle 102 via a communication port 129 (an example of an inflow port). The communication port 129 is formed in the front wall 121A that partitions the front end of the reservoir 121. Thus, the ink flowing out of the ink cartridge 30 through the ink needle 102 is accumulated in the reservoir 121. A convex portion 120 having an inner space continuous with the reservoir 121 is formed above the reservoir 121 and in front of the flow passage 123. A pair of side walls of the convex portion 120 facing the left-right direction 9 is formed of a light transmitting member. The arm 53 and the detected part 54 of the rotating member 50, which will be described later, are located on the convex part 120.

The reservoir 121 communicates with the ink flow path 126 via a communication port 128 (an example of an outlet port). The communication port 128 is formed in the bottom wall 121B that partitions the lower end of the reservoir 121. The communication port 128 is located below the communication port 129 in the gravity direction.

The ink flow path 126 extends upward from the reservoir 121 and is continuous with the ink outlet 127. The ink tube 20 is connected to the ink outflow port 127. Thus, the ink stored in the storage chamber 121 flows out from the communication port 128, and is supplied to the recording head 21 through the ink flow path 126 and the ink tube 20.

The buffer chamber 122 communicates with an atmosphere communication port 124 (an example of a second atmosphere communication portion) provided in an upper portion of the tank 103. The buffer chamber 122 and the atmosphere communication port 124 communicate with each other through a through hole 119 (see fig. 6) formed in the front wall 122A that partitions the front end of the buffer chamber 122. The through hole 119 is sealed by a semipermeable membrane 118. The atmosphere communication port 124 opens to the outside. Thereby, the reservoir 121 and the buffer chamber 122 can be opened to the atmosphere. That is, the atmosphere communication port 124 communicates the reservoir chamber 121 and the buffer chamber 122 with the atmosphere. The atmospheric communication between the storage chamber 121 and the buffer chamber 122 is not limited to the structure that is always in communication with the atmosphere as in the present embodiment, and a structure that maintains and blocks the flow of the atmosphere may be provided. For example, a well-known switching unit (not shown) or the like for switching the communication with the atmosphere may be provided, and the state of the communication with the atmosphere and the state of the blocking of the atmosphere may be switched.

In fig. 5, the film forming the rear surface of the tank 103 is omitted, but the respective rear surfaces of the reservoir 121, the buffer chamber 122, the flow path 123, and the ink flow path 126 are sealed with films.

[ rotating Member 50]

As shown in fig. 6, the rotary member 50 is disposed in the storage chamber 121 of each tank 103. The rotating member 50 is supported by a support member (not shown) disposed in the storage chamber 121 so as to be rotatable in the directions of arrows 58 and 59. The rotary member 50 may be supported by a member other than the support member. For example, the rotating member 50 may be supported by a wall of the cartridge case 101 that partitions the accumulation chamber 121.

The rotating member 50 includes a float 51, a shaft 52, an arm 53, and a detection unit 54. The float 51 is located at a lower portion of the rotating member 50. The float 51 is formed of a material having a lower specific gravity than the ink accumulated in the accumulation chamber 121. The shaft 52 protrudes from the right and left surfaces of the float 51 in the left-right direction 9. The shaft 52 is inserted into a hole formed in the support member. Thereby, the rotary member 50 is supported by the support member so as to be rotatable about the shaft 52.

The arm 53 protrudes substantially upward from the float 51. The detection section 54 is formed on the protruding distal end portion of the arm 53. The arm 53 and the detected part 54 are located in the internal space of the convex part 120. The detection target portion 54 is formed in a plate shape extending in the vertical direction 7 and the front-rear direction 8. The detection section 54 is formed of a material that blocks light output from a light emitting section of the liquid level sensor 55 described later.

When the liquid surface of the ink accumulated in the accumulation chamber 121 is located above the position P1 of the connection portion 107 in the vertical direction 7, in other words, when the liquid surface of the ink accumulated in the accumulation chamber 33 of the ink cartridge 30 is located above the position P1 of the ink supply portion 34 in the vertical direction 7, the rotation member 50 rotates in the direction of the arrow 58 by the buoyancy acting on the float 51. Thereby, the rotating member 50 is located at the detection position partially indicated by the solid line in fig. 6.

Here, in the present embodiment, the position P1 is the same height as the axial center of the ink needle 102 and the center of the ink supply port 71. However, the position P1 is not limited to the position of the present embodiment as long as it is the same height as the connecting portion 107 and the ink supply portion 34 in the vertical direction 7. For example, the position P1 may be the same height as the upper end or the lower end of the ink needle 102, or may be the same height as the upper end or the lower end of the ink supply port 71.

On the other hand, when the ink stored in the storage chamber 121 and the ink valve chamber 35 is consumed and the liquid level of the ink drops to a position equal to or lower than the position P1 in the vertical direction 7, the rotation member 50 rotates in the direction of the arrow 59 following the liquid level. Thereby, the rotating member 50 is located at the non-detection position shown by the broken line in fig. 6. That is, the rotation member 50 changes its state on the condition that the liquid level of the ink stored in the reservoir 121 is at the same position as the connection portion 107 in the vertical direction 7.

[ liquid level sensor 55]

The liquid level sensor 55 (see fig. 8) detects a change in the state of the rotary member 50 including the detection portion 54. In the present embodiment, the liquid level sensor 55 includes a light emitting portion and a light receiving portion. The light emitting unit and the light receiving unit are arranged with an interval in the left-right direction 9 so as to be separated from the convex portion 120 of the can 103. The light emitting section is disposed on one of the right and left sides of the convex section 120, and the light receiving section is disposed on the other of the right and left sides of the convex section 120. The optical path of the light output from the light emitting section coincides with the left-right direction 9. The detected part 54 of the rotating member 50 that detects the position is located between the light emitting part and the light receiving part.

The liquid level sensor 55 outputs different detection signals depending on whether or not the light output from the light emitting portion is received by the light receiving portion. For example, the liquid level sensor 55 outputs a low level signal (which means a "signal having a signal level less than a threshold level") to the control unit 130 (see fig. 8) on the condition that the light output from the light emitting unit is not received by the light receiving unit (that is, the received light intensity is less than a predetermined intensity). On the other hand, the liquid level sensor 55 outputs a high level signal (which means a signal having a signal level equal to or higher than a threshold level) to the control unit 130 on the condition that the light output from the light emitting unit is successfully received by the light receiving unit (that is, the received light intensity is equal to or higher than a predetermined intensity).

The detection target portion 54 of the detection position is located between the light emitting portion and the light receiving portion. Accordingly, when the liquid level of the ink stored in the storage chamber 121 of the tank 103 (in other words, the liquid level of the ink stored in the storage chamber 33 of the ink cartridge 30) is located above the position P1 in the vertical direction 7, the light output from the light emitting unit is not received by the light receiving unit, and therefore the liquid level sensor 55 outputs a low level signal to the control unit 130. On the other hand, the detection target portion 54 at the non-detection position is at a position retreated from between the light emitting portion and the light receiving portion. Accordingly, when the liquid level of the ink stored in the storage chamber 121 (in other words, the liquid level of the ink stored in the storage chamber 33 of the ink cartridge 30) is at a position equal to or lower than the position P1 in the vertical direction 7, the light output from the light emitting portion is received by the light receiving portion, and therefore the liquid level sensor 55 outputs a high level signal to the control portion 130.

[ ink Cartridge 30]

The ink cartridge 30 shown in fig. 6 and 7 is a container for storing ink. The posture of the ink cartridge 30 shown in fig. 6 and 7 is a use posture.

As shown in fig. 6 and 7, the ink cartridge 30 has a substantially rectangular parallelepiped case 31. The housing 31 is composed of a rear wall 40, a front wall 41, an upper wall 39, a lower wall 42, a right side wall 37, and a left side wall 38.

The casing 31 has a flat shape having a small dimension in the left-right direction 9 as a whole and having a larger dimension in the up-down direction 7 and the front-rear direction 8 than the dimension in the left-right direction 9. At least the front wall 41 of the housing 31 has a light-transmitting property that allows the liquid level of the ink stored in the storage chamber 32 and the storage chamber 33 to be visually checked from the outside.

The housing 31 has a sub-lower wall 48, and the sub-lower wall 48 is located above the lower wall 42 and extends forward continuously from the lower end of the rear wall 40. The lower wall 42 is continuous with the sub-lower wall 48 by a stepped surface 49. The ink supply portion 34 extends rearward from the stepped surface 49 below the sub lower wall 48 and above the lower wall 42.

A convex portion 43 protruding upward is provided on the outer surface of the upper wall 39. The convex portion 43 extends in the front-rear direction 8. The forward surface of the projection 43 is a locking surface 151. The locking surface 151 is located above the upper wall 39. The locking surface 151 is a surface that can come into contact with the locking portion 145 in a state where the cartridge assembly portion 110 is mounted with the ink cartridge 30. When the locking surface 151 comes into contact with the locking portion 145 to push the locking portion 145 forward, the ink cartridge 30 is held in the cartridge mounting portion 110 against the urging force of the coil springs 78 and 98.

An inclined surface 155 is formed behind the locking surface 151 of the projection 43. In the process of fitting the ink cartridge 30 to the cartridge fitting portion 110, the locking portion 145 is guided along the inclined surface 155. Thereby, the locking portion 145 is guided to a position where it contacts the locking surface 151.

An operation portion 90 is formed in the upper wall 39 in front of the locking surface 151. When the operation surface 92 of the operation portion 90 is pressed downward in a state where the ink cartridge 30 is mounted to the cartridge mounting portion 110, the ink cartridge 30 rotates and the lock surface 151 moves downward. Thereby, the locking surface 151 is located below the locking portion 145. As a result, the ink cartridge 30 can be pulled out from the cartridge mounting portion 110.

A light shielding plate 67 protruding upward is formed on the outer surface of the upper wall 39. The light shielding plate 67 extends in the front-rear direction 8. The light shielding plate 67 is located rearward of the convex portion 43.

In a state where the ink cartridge 30 is mounted in the cartridge mounting portion 110, the light shielding plate 67 is positioned between the light emitting portion and the light receiving portion of the mounting sensor 113. Thereby, the light shielding plate 67 blocks the light of the mount sensor 113 traveling in the left-right direction 9. More specifically, the light output from the light emitting portion on which the sensor 113 is mounted is irradiated on the light shielding plate 67 before reaching the light receiving portion, and thus the intensity of the light reaching the light receiving portion becomes smaller than a predetermined intensity, for example, 0. The light shielding plate 67 may completely block the light traveling in the left-right direction 9, partially attenuate the light, bend the light traveling direction, or totally reflect the light.

In the present embodiment, the light shielding plate 67 is formed with a notch 66. The cutout 66 is a space recessed downward from the upper end of the light shielding plate 67, and is expanded in the front-rear direction 8. Since the slit 66 is located in the mount sensor 113, light output from the light-emitting portion of the mount sensor 113 is not blocked until reaching the light-receiving portion. The type of the ink cartridge 30, that is, the type and initial amount of ink stored in the ink cartridge 30 can be determined by the presence or absence of the notch 66.

An IC board 64 is provided between the light shielding plate 67 and the convex portion 43 in the front-rear direction 8 on the outer surface of the upper wall 39. The IC board 64 is electrically connected to the contact 106 in a state where the ink cartridge 30 is mounted on the cartridge mounting portion 110.

An IC (not shown in the drawings) and four electrodes 65 are mounted on the IC substrate 64. The four electrodes 65 are arranged along the left-right direction 9. The IC is an integrated circuit, and stores data indicating information relating to the ink cartridge 30, for example, a lot number, a manufacturing date, and ink color, so as to be readable.

Each electrode 65 is electrically connected to the IC. Each of the electrodes 65 extends along the front-rear direction 8, and the four electrodes 65 are arranged apart from each other in the left-right direction 9. Each electrode 65 is exposed on the upper surface of the IC substrate 64 so as to be electrically accessible.

A stepped surface 95 extends upward from the front end of the rear sub upper surface 91 of the outer surface of the upper wall 39. The stepped surface 95 is a surface facing rearward. An atmosphere communication port 96 (an example of a first atmosphere communication portion) for communicating the reservoir chamber 32 with the atmosphere is formed in the stepped surface 95. As shown in fig. 6, in the process of assembling the ink cartridge 30 to the cartridge assembling portion 110, the lever 125 enters the atmosphere valve chamber 36 (described later) via the atmosphere communication port 96. The rod 125 entering the atmosphere communication port 96 moves the valve 97 that seals the atmosphere communication port 96 forward against the biasing force of the coil spring 98. The valve 97 moves forward and separates from the atmosphere communication port 96, thereby opening the reservoir chamber 32 to the atmosphere.

As shown in fig. 6, a reservoir chamber 32, a reservoir chamber 33, an ink valve chamber 35, and an atmosphere valve chamber 36 are formed inside the housing 31. The reservoir 32, the reservoir 33, and the ink valve chamber 35 store ink. The atmosphere valve chamber 36 allows the atmosphere to flow between the storage chamber 32 and the outside of the housing 31. The reservoir 32 and the reservoir 33 are vertically partitioned by a partition wall 73, and communicate with each other through a through hole, not shown, formed in the partition wall 73. The reservoir chamber 32 and the atmosphere valve chamber 36 are vertically partitioned by a partition wall 74, and communicate with each other through a through hole 46 formed in the partition wall 74. The reservoir 33 and the ink valve chamber 35 are partitioned by partition walls 75 in the front-rear direction and communicate with each other through a through hole 99 formed in the lower end of the reservoir 33.

Therefore, the reservoir 32 is a space defined by the inner surfaces of the outer walls of the casing 31, the upper surfaces of the partition walls 73, and the lower surfaces of the partition walls 74. The reservoir 33 is a space defined by the inner surfaces of the outer walls of the casing 31, the lower surface of the partition wall 73, and the front surface of the partition wall 75. The reservoirs 32 and 33 are an example of a first reservoir.

The atmosphere valve chamber 36 accommodates a valve 97 and a coil spring 98. The atmosphere valve chamber 36 communicates with the outside through an atmosphere communication port 96 formed in the stepped surface 95. The valve 97 is movable to a closed position sealing the atmosphere communication port 96 and an open position away from the atmosphere communication port 96. The coil spring 98 is disposed so as to be expandable and contractible along the front-rear direction 8, and biases the valve 97 rearward in a direction of contact with the atmosphere communication port 96.

A through hole 94 is formed in a wall 93 that partitions the front end of the atmosphere valve chamber 36. The reservoir chamber 32 communicates with the atmosphere valve chamber 36 through the through hole 46 and the through hole 94. The through-hole 94 is sealed by the semipermeable membrane 80.

The ink supply unit 34 protrudes rearward from the stepped surface 49. The ink supply portion 34 has a cylindrical shape. The internal space of the ink supply portion 34 is an ink valve chamber 35 (an example of a liquid flow path). The rear end of the ink supply unit 34 opens to the outside of the ink cartridge 30 through the ink supply port 71. A seal member 76 is provided at the rear end of the ink supply unit 34. As described above, the front end of the ink supply unit 34 communicates with the lower end of the reservoir 33 through the through hole 99. That is, the ink supply portion 34 communicates with the lower end of the reservoir 33.

The ink valve chamber 35 houses a valve 77 and a coil spring 78. The valve 77 opens and closes the ink supply port 71 penetrating through the center of the sealing member 76 by moving in the front-rear direction 8. The coil spring 78 biases the valve 77 rearward. Therefore, the valve 77 closes the ink supply port 71 of the sealing member 76 in a state where no external force is applied.

The sealing member 76 is a disk-shaped member having a through hole formed in the center thereof. The seal member 76 is formed of an elastic material such as rubber or elastomer. The center of the seal member 76 penetrates in the front-rear direction 8 to form a cylindrical inner circumferential surface, and the ink supply port 71 is formed by the inner circumferential surface. The inner diameter of the ink supply port 71 is slightly smaller than the outer diameter of the ink needle 102.

When the ink cartridge 30 is mounted on the cartridge mounting portion 110 in a state where the valve 77 closes the ink supply port 71 and the valve 114 closes the opening 116 of the ink needle 102, the ink needle 102 enters the ink valve chamber 35 via the ink supply port 71. That is, the connection portion 107 is connected to the ink supply portion 34. At this time, the outer peripheral surface of the ink needle 102 is in liquid-tight contact with the inner peripheral surface defining the ink supply port 71 while elastically deforming the sealing member 76. When the tip end of the ink needle 102 enters the ink valve chamber 35 through the seal member 76, the tip end of the ink needle 102 abuts on the valve 77. When the ink cartridge 30 is further inserted into the cartridge mounting portion 110, the ink needle 102 moves the valve 77 forward against the biasing force of the coil spring 78. Thereby, the ink supply port 71 is opened.

Further, the tip of the ink needle 102 abuts on the valve 77, and the valve 77 abuts on the valve 114 from the front to press the valve 114. Then, the valve 114 moves backward against the urging force of the coil spring 115. Thereby, the opening 116 is opened. As a result, the ink stored in the ink valve chamber 35 can flow through the internal space 117 of the ink needle 102 to the storage chamber 121 of the tank 103. As described above, the ink stored in the storage chamber 32, the storage chamber 33, and the ink valve chamber 35 is supplied to the storage chamber 121 of the tank 103 by the ink supply unit 34.

[ control section 130]

The schematic configuration of the control unit 130 will be described below with reference to fig. 8. The control unit 130 controls the overall operation of the mfp 10. The control unit 130 includes a CPU131, a ROM132, a RAM133, an EEPROM134, an ASIC135, and an internal bus 137 connecting these components.

The ROM132 stores programs and the like for controlling various operations including recording control by the CPU 131. The RAM133 is used as a storage area for temporarily storing data, signals, and the like used when the CPU131 executes the programs. The EEPROM134 stores settings, flags, and the like to be held even after power-off.

The ASIC135 is connected to a conveyance motor 171, a feeding motor 172, and a carriage driving motor 173. The ASIC135 incorporates a drive circuit for controlling each motor. When a drive signal for rotating a predetermined motor is input from the CPU131 to a drive circuit corresponding to the motor, a drive current corresponding to the drive signal is output from the drive circuit to the corresponding motor. Thereby, the corresponding motor rotates. That is, the control unit 130 controls the driving of the motors 171, 172, and 173.

In addition, the signal output from the mount sensor 113 is input to the ASIC 135. When the signal input from the attachment sensor 113 is at a low level, the control unit 130 determines that the ink cartridge 30 is attached to the cartridge attaching unit 110. On the other hand, when the signal input from the attachment sensor 113 is at a high level, the control unit 130 determines that the ink cartridge 30 is not attached to the cartridge attaching unit 110.

Further, the ASIC135 receives a signal output from the liquid level sensor 55. When the signal input from the liquid level sensor 55 is at a low level, the control unit 130 determines that the liquid level of the ink stored in the storage chamber 121 of the tank 103 and the storage chamber 33 of the ink cartridge 30 is located above the position P1. On the other hand, when the signal input from the liquid level sensor 55 is at a high level, the control unit 130 determines that the liquid level of the ink stored in the storage chamber 121 of the tank 103 and the storage chamber 33 of the ink cartridge 30 is at a position P1 or less in the vertical direction 7. When determining that the liquid level of the ink is not higher than the position P1 in the vertical direction 7, the control unit 130 displays the liquid level on a display, turns on an LED, or sounds a buzzer to notify the user that the cartridge needs to be replaced.

The control unit 130 determines the position in the vertical direction 7 of the liquid surface of the ink stored in the storage chamber 33 for each of the four ink cartridges 30. The control unit 130 determines the position of the liquid surface of the ink stored in the reservoir 121 in the vertical direction 7 for each of the tanks 103 corresponding to the four ink cartridges 30.

In addition, the ASIC135 is connected to the piezoelectric element 45. The piezoelectric element 45 operates by being supplied with power from the control unit 130 via a drive circuit not shown. The control unit 130 controls the supply of power to the piezoelectric element 45 and selectively ejects ink droplets from the plurality of nozzles 29.

When recording an image on the sheet 12, the control unit 130 controls the conveyance motor 171 to cause the conveyance roller pair 25 and the discharge roller pair 27 to perform an intermittent conveyance process in which conveyance and stopping of the sheet 12 are alternately repeated by a predetermined line feed amount.

While the sheet 12 is stopped in the intermittent conveyance process, the control unit 130 executes the discharge process. The ejection process is a process of controlling the supply of power to the piezoelectric element 45 and ejecting ink droplets from the nozzles 29 while moving the carriage 22 in the left-right direction 9. That is, in the ejection process, the control section 130 ejects ink droplets from the nozzles 29 while moving the carriage 22 from one end of the printing range to the other end of the printing range in a primary path (hereinafter, also referred to as a single path). Thereby, an image of a path amount is recorded to the sheet 12.

By alternately performing the intermittent conveyance process and the ejection process, an image can be recorded on the entire image-recordable area of the sheet 12. The process of alternately performing the intermittent conveyance process and the ejection process to record an image on the sheet 12 is an image recording process.

The control unit 130 controls the motors 171, 172, and 173, the piezoelectric element 45, and the like based on signals input from the sensors 55 and 113, and the like, thereby executing a series of processes for recording an image on the sheet 12. The series of processes includes a process of conveying the sheet 12 supported by the feed tray 15 to the conveying path 17 by the feed roller 23, conveying the sheet 12 conveyed to the conveying path 17 toward the conveying direction by the pair of conveying rollers 25 and the pair of discharge rollers 27, recording an image on the sheet 12 conveyed on the conveying path 17 by performing an intermittent conveying process and a discharge process, and discharging the sheet 12 on which the image is recorded to the discharge tray 16 by the pair of discharge rollers 27.

[ flow path resistance ]

Here, in a state where the ink cartridge 30 is mounted in the cartridge mounting portion 110, a flow path resistance value when the atmosphere flows through a flow path extending from the through hole 46 opening to the accumulation chamber 32 to the atmosphere communication port 96 is set to a flow path resistance value R1A. The flow resistance value when the ink flows through the ink supply unit 34 is set to the flow resistance value R1B. The sum of the flow resistance value R1A and the flow resistance value R1B is defined as a first flow resistance value R1. In the tank 103, the second flow resistance value R2 is set to the flow resistance value when the atmospheric air flows through the flow path from the through hole 119 in the front wall 122A of the buffer chamber 122 to the atmospheric air communication port 124.

In the tank 103, a space between the horizontal plane at the position P2 and the horizontal plane at the position P1 is defined as a space Q, and the position P2 is a position including a boundary in the vertical direction 7 between the reservoir 121 and the flow path 123. In the reservoirs 32 and 33 of the ink cartridge 30, an average cross-sectional area along the horizontal direction of a space (an example of a first space) included in the space Q is set as a first average cross-sectional area S1. In the storage chamber 121 of the tank 103, an average cross-sectional area along the horizontal direction of a space (an example of the second space) included in the space Q is set to a second average cross-sectional area S2. The value obtained by dividing the first average cross-sectional area S1 by the second average cross-sectional area S2 is defined as the cross-sectional area ratio a. At this time, the second flow resistance value R2 is larger than a value a · R1 obtained by multiplying the first flow resistance value R1 by the cross-sectional area ratio a (R2> a · R1).

[ Effect of the present embodiment ]

By supplying ink from the reservoir 121 of the tank 103 to the recording unit 24 through the communication port 128 and the ink outlet 127, ink flows out from the reservoirs 32 and 33 of the ink cartridge 30 to the tank 103. At this time, by configuring the second flow path resistance value R2 to be larger than the value a · R1 obtained by multiplying the first flow path resistance value R1 by the cross-sectional area ratio a, the speed at which the liquid level of the ink in the space included in the space Q of the reservoir chambers 32, 33 drops is higher than the speed at which the liquid level of the ink in the space included in the space Q of the reservoir chamber 121 of the tank 103 drops. Accordingly, the ink is exhausted earlier in the reservoir chambers 32 and 33 on the ink cartridge 30 side than in the reservoir chamber 121 on the tank 103 side, and the entry of the atmosphere from the communication port 128 of the tank 103 to the recording portion 24 can be suppressed. Further, since the ink stored in the storage chambers 32 and 33 of the ink cartridge 30 is preferentially supplied to the recording unit 24, the following can be suppressed: although the ink remains in the storage chambers 32 and 33, the liquid level of the ink in the storage chamber 121 of the tank 103 drops first, and the control unit 130 determines that the liquid level of the storage chamber 121 is equal to or lower than the position P1.

[ modified examples ]

In the above-described embodiment, in the tank 103, the position in the vertical direction 7 of the horizontal plane including the boundary in the vertical direction 7 between the reservoir 121 and the flow path 123 is defined as the position P2, and the space between the position P1 and the position P2 is defined as the space Q, but the space Q may be defined by defining the position P2 as another position. For example, the space Q may be defined such that the position P2 is not a boundary between the reservoir 121 and the flow path 123 in the vertical direction 7 but is a position below the boundary and above the position P1.

In the above-described embodiment, in the ink cartridge 30, the semipermeable membrane 80 seals the flow path from the through hole 46 opening to the accumulation chamber 32 to the atmosphere communication port 96, and in the tank 103, the semipermeable membrane 118 seals the flow path from the through hole 119 in the front wall 122A of the buffer chamber 122 to the atmosphere communication port 124. In general, the flow path resistance is determined by the cross-sectional area of the flow path, the friction coefficient of the surface of the flow path, the length of the flow path, and the like, but the flow path resistance increased by providing a semipermeable membrane in the flow path is overwhelmingly large as compared with the flow path resistance generated by these. Therefore, by disposing the semipermeable membranes in the respective air flow paths of the ink cartridge 30 and the tank 103, and changing the gas permeability of each semipermeable membrane or changing the area of each semipermeable membrane, the flow path resistance value can be easily adjusted by the difference between the semipermeable membranes. However, the semipermeable membrane may not be disposed in each of the air flow paths, and the first flow path resistance value R1 and the second flow path resistance value R2 may be set by the cross-sectional area, length, and the like of the air flow path and the ink flow path, and the first average cross-sectional area S1 and the second average cross-sectional area S2 may be set to satisfy the following equation: r2> A.R 1.

In the above-described embodiment, the semipermeable membrane 80 is provided in the ink cartridge 30, but the semipermeable membrane 80 need not be provided in the ink cartridge 30, and for example, in the ink cartridge 30 in a state of being mounted in the cartridge mounting portion 110, the semipermeable membrane 80 may be provided at any position of the atmospheric flow path from the outside to the reservoir chamber 32. Therefore, for example, in a configuration in which an atmosphere flow path is provided inside the rod 125 of the cartridge mounting portion 110, and the atmosphere communication port 96 of the ink cartridge 30 and the internal space of the rod 125 are continuous to form the atmosphere flow path in a state in which the ink cartridge 30 is mounted in the cartridge mounting portion 110, the semipermeable membrane 80 may be provided in the atmosphere flow path continuous with the internal space of the rod 125 of the cartridge mounting portion 110.

The ink supply port 71 may be sealed with a film instead of the valve 77. The ink supply port 71 may be formed by piercing a sealing member such as an elastic resin having no through-hole with a needle or the like, and the ink supply port 71 may be sealed by the elasticity of the sealing member when the needle is pulled out from the sealing member. The ink supply unit 34 need not be implemented as a cylindrical member, and may be a through hole formed in the front wall 41 of the housing 31, for example.

In the above embodiment, the control unit 130 determines that the liquid surface of the ink stored in the storage chamber 121 of the tank 103 and the storage chamber 33 of the ink cartridge 30 is located at the position P1 or less in the vertical direction 7 on the condition that the state of the rotary member 50 has changed and the input signal from the liquid surface sensor 55 changes from the low level to the high level.

However, the control unit 130 may determine that the liquid level of the ink stored in the storage chamber 121 of the tank 103 and the storage chamber 33 of the ink cartridge 30 is not higher than the position P1 in the vertical direction 7 by a condition other than the above-described conditions.

For example, the control unit 130 may count dots of ink droplets ejected from the recording head 21 after the state of the rotary member 50 changes and the input signal from the liquid level sensor 55 changes from a low level to a high level. It is also possible to determine that the liquid level of the ink stored in the reservoir 121 of the tank 103 and the reservoir 33 of the ink cartridge 30 is a predetermined position below the position P1 in the vertical direction 7 on condition that the dot count value is equal to or greater than the predetermined value. The predetermined value is determined based on the volume of the reservoir 121 below the connection portion 107, and the like.

In the above embodiment, the mount sensor 113 and the liquid level sensor 55 are optical sensors including a light emitting portion and a light receiving portion. However, the mount sensor 113 and the liquid level sensor 55 may be sensors such as proximity sensors, which are different from the optical sensors.

In the above embodiment, the detection that the liquid level of the ink stored in the storage chamber 121 is equal to or lower than the position P1 is performed by the rotation of the rotating member 50 disposed in the storage chamber 121 of each tank 103. However, the detection may be performed by means other than the rotation of the rotating member 50.

For example, a prism may be disposed at the same height as the position P1 in the storage chamber 121 of each tank 103. Further, it is possible to detect whether or not the liquid surface of the ink stored in the storage chamber 121 is equal to or lower than the position P1 based on a phenomenon that the traveling direction of the light incident on the prism differs depending on whether or not the liquid surface of the ink stored in the storage chamber 121 is located above the prism.

For example, two electrodes may be disposed in the storage chamber 121 of each tank 103. The lower end of one of the two electrodes is located slightly higher than the position P1. The lower end of the other of the two electrodes is located below the position P1. Further, whether or not the liquid level of the ink stored in the reservoir 121 is equal to or lower than the position P1 can be detected based on whether or not the current flows between the two electrodes through the ink.

The detection portions such as the rotation member 50 and the liquid surface sensor 55 may be provided not in the tank 103 but in the reservoirs 32 and 33 of the ink cartridge 30.

In the above embodiment, the connection portion 107 of the cartridge mounting portion 110 and the ink supply portion 34 of the ink cartridge 30 extend in the horizontal direction. The ink cartridge 30 is mounted to the cartridge mounting portion 110 by being inserted in the horizontal direction with respect to the cartridge mounting portion 110. At this time, the connection portion 107 is connected to the ink supply portion 34 in the horizontal direction. However, the ink cartridge 30 may be mounted to the cartridge mounting portion 110 by being inserted in a direction other than the horizontal direction, for example, the up-down direction 7, with respect to the cartridge mounting portion 110.

In this case, for example, the connection portion 107 protrudes upward from the cartridge case 101. The ink supply unit 34 projects downward from the lower wall of the ink cartridge 30. In this case, the position P1 is set to, for example, the center position of the connection portion 107 in the vertical direction 7, the center position of the ink supply portion 34 in the vertical direction 7, or the like.

Although the above embodiment has been described with ink as an example of the liquid, for example, a pretreatment liquid that is ejected to paper or the like prior to ink at the time of image recording may be stored in the ink cartridge 30 or the tank 103 instead of ink. Further, water for cleaning the recording head 21 may be stored in the ink cartridge 30 or the tank 103.

Description of the reference symbols

10 … combination machine (image recording device)

24 … recording part

29 … nozzle

30 … ink box (Box)

32. 33 … accumulation chamber (first accumulation chamber)

34 … ink supply unit (supply unit)

55 … liquid level sensor (detecting part)

77 … valve

80. 118 … semipermeable membrane

96 … atmosphere communication port (first atmosphere communication part)

102 … ink needle (connecting part, tube)

103 … tank

107 … connection part

110 … box assembling part

121 … reservoir (second reservoir, first part)

123 … flow path (second reservoir, second part)

124 … atmosphere communication port (second atmosphere communication part)

128 … communication port (outflow)

130 … control part

Claims (10)

1. An image recording apparatus includes:

a cartridge having a first reservoir for storing a liquid, a first atmosphere communication portion for communicating the first reservoir with an atmosphere, and a supply portion for supplying the liquid stored in the first reservoir;

a cartridge mounting portion having a connecting portion connectable to the supply portion, and a tank having an inflow port through which the liquid flows from the first reservoir chamber through the supply portion connected to the connecting portion, a second reservoir chamber in which the liquid flowing in through the inflow port is stored, a second atmosphere communicating portion through which the second reservoir chamber communicates with the atmosphere, and an outflow port through which the liquid stored in the second reservoir chamber flows out; and

a recording unit for ejecting the liquid flowing out from the second reservoir through the outlet port from a nozzle,

a second flow path resistance value R2 is larger than a value a · R1 obtained by multiplying a first flow path resistance value R1 by a cross-sectional area ratio a, the second flow path resistance value R2 is a flow path resistance value when atmospheric air flows through the second atmosphere communication portion, the first flow path resistance value R1 is a sum of a flow path resistance value when atmospheric air flows through the first atmosphere communication portion and a flow path resistance value when liquid flows to the supply portion, and the cross-sectional area ratio a is a cross-sectional area ratio obtained by dividing a first average cross-sectional area of a first space containing at least the vicinity of the supply portion, in which liquid is stored in the first reservoir, by a second average cross-sectional area of a second space at the same height as the first space, in which liquid is stored in the second reservoir.

2. The image recording device according to claim 1,

the second reservoir has a first portion and a second portion located above the first portion and having a smaller cross-sectional area than the first portion,

the second space is a space from a boundary between the first portion and the second portion to the connection portion in the space of the second reservoir.

3. The image recording device according to claim 1 or 2,

the flow path resistance value when the atmosphere flows through the first atmosphere communication portion is a flow path resistance value in a state where the cartridge is mounted on the cartridge mounting portion.

4. The image recording device according to claim 1 or 2,

the second space is a space including a vicinity of the connection portion,

the image recording apparatus further includes:

a detection unit that detects that a liquid surface is located in the vicinity of the connection portion in the second reservoir; and

and a control unit for determining that the liquid in the first reservoir is not in a residual amount based on a detection signal of the detection unit, and notifying replacement of the cartridge.

5. The image recording device according to claim 1 or 2,

the flow path of the second atmosphere communication section is sealed by a semipermeable membrane.

6. The image recording device according to claim 5,

the flow path of the first atmosphere communication section is sealed by a semipermeable membrane.

7. The image recording device according to claim 1 or 2,

the outlet is located below the supply unit in the direction of gravity.

8. The image recording device according to claim 1 or 2,

the supply part is provided with a valve for opening and closing the liquid flow path,

the connecting portion has a tube body that communicates an internal space with the liquid flow path by coming into contact with the valve and entering the liquid flow path.

9. The image recording device according to claim 8,

the pipe body as the connecting portion extends in the horizontal direction.

10. An image recording system having:

a cartridge having a first reservoir for storing a liquid, a first atmosphere communication portion for communicating the first reservoir with an atmosphere, and a supply portion for supplying the liquid stored in the first reservoir; and

an image recording apparatus includes a recording unit for ejecting a liquid supplied from the supply unit of the cartridge from a nozzle,

wherein the image recording apparatus includes a cartridge mounting portion having a connecting portion connectable to the supply portion, and a tank having an inlet port through which the liquid flows from the first reservoir chamber through the supply portion connected to the connecting portion, a second reservoir chamber in which the liquid flowing through the inlet port is stored, a second atmosphere communicating portion through which the second reservoir chamber communicates with the atmosphere, and an outlet port through which the liquid stored in the second reservoir chamber flows out,

the recording unit discharges the liquid flowing out of the second reservoir through the outlet port from the nozzle,

a second flow path resistance value R2 is larger than a value a · R1 obtained by multiplying a first flow path resistance value R1 by a cross-sectional area ratio a, the second flow path resistance value R2 is a flow path resistance value when atmospheric air flows through the second atmosphere communication portion, the first flow path resistance value R1 is a sum of a flow path resistance value when atmospheric air flows through the first atmosphere communication portion and a flow path resistance value when liquid flows to the supply portion, and the cross-sectional area ratio a is a cross-sectional area ratio obtained by dividing a first average cross-sectional area of a first space containing at least the vicinity of the supply portion, in which liquid is stored in the first reservoir, by a second average cross-sectional area of a second space at the same height as the first space, in which liquid is stored in the second reservoir.

Images