JP7683386B2 - liquid discharge device - Google Patents

Description

The present invention relates to a liquid ejection device having an electrically driven valve that can selectively take either a connected state that connects an atmosphere communication passage for connecting a liquid storage chamber that is connected to a liquid ejection head with the outside, or a blocked state that blocks the atmosphere communication passage.

Patent document 1 describes an inkjet recording device in which ink supplied from an ink tank is stored in an ink buffer, and the ink is ejected from a print head on a carriage onto a recording medium to perform a recording operation. In this inkjet recording device, the atmosphere release electromagnetic valve that controls communication between the upper air layer in the ink buffer and the atmosphere is open during ink supply, when ink in the ink tank is supplied to the ink buffer. This allows the air in the upper part of the ink buffer to escape during ink supply, and the ink in the ink buffer is not pressurized. Also, in this inkjet recording device, the atmosphere release electromagnetic valve is closed during purging, and pressurized ink is supplied from the ink tank to perform the purging operation.

Publication number 01-040681

Thus, Patent Document 1 describes an inkjet recording device having an atmosphere venting solenoid valve. However, Patent Document 1 does not describe in detail the power source that generates the voltage supplied to the atmosphere venting solenoid valve and the print head, or the power line that supplies the voltage generated by the power source to the atmosphere venting solenoid valve and the print head. For example, the voltage supplied to the atmosphere venting solenoid valve and the voltage supplied to the print head are usually generated by separate power sources and supplied to the atmosphere venting solenoid valve and the print head via separate power lines. In this case, space is required to install multiple power sources and multiple power lines, which creates a problem of the device becoming larger.

The object of the present invention is to provide a liquid ejection device that can be made smaller.

The liquid ejection device of the present invention includes a liquid ejection head having a nozzle for ejecting liquid, a liquid storage chamber for storing liquid, an atmosphere communication passage for connecting the liquid storage chamber to the outside, and a liquid storage section having an electrically driven valve capable of selectively taking either a communication state for connecting the atmosphere communication passage or a blocking state for blocking the atmosphere communication passage, a liquid flow path connecting the liquid ejection head and the liquid storage chamber so that liquid can flow, a power source for generating voltage, a main board on which the power source is mounted, a sub-board to which the liquid ejection head and the valve are connected, a control unit mounted on the main board, a signal line connected to the control unit, and a power line connected to the power source. and a supply unit that supplies the voltage generated by the power supply and input via the power line to the liquid ejection head and the valve, wherein the supply unit is capable of switching the destination of the voltage supply, and the power line is formed on a flexible cable, the supply unit is mounted on the sub-substrate, and a voltage is input via the power line and has a switching circuit that switches the destination of the voltage supply between the liquid ejection head and the valve, the control unit generates a switching signal that instructs the switching circuit to switch the destination of the voltage supply, and the switching circuit switches the destination of the voltage supply based on the switching signal generated by the control unit and input via the signal line .
From another perspective, the liquid ejection device of the present invention comprises a liquid ejection head having a nozzle for ejecting liquid, a liquid storage chamber for storing liquid, an atmosphere communication passage for connecting the liquid storage chamber with the outside, and a liquid storage section having an electrically operated valve capable of selectively taking either a connected state for connecting the atmosphere communication passage or a blocked state for blocking the atmosphere communication passage, a liquid flow path connecting the liquid ejection head and the liquid storage chamber so that liquid can flow through, a power source for generating voltage, a power line connected to the power source, and a supply section for supplying the voltage generated by the power source and input via the power line to the liquid ejection head and the valve, and the supply section is capable of switching the destination of the voltage supply. The supply unit further includes a wiring connected to an end of the power line opposite to the end connected to the power supply, the wiring being branched, the wiring being formed of a first branch wiring connected to the liquid ejection head and a second branch wiring connected to the valve, a first connection line connecting a midpoint on the second branch wiring and a ground, a capacitor provided on the first connection line and charged by a voltage input to the second branch wiring via the power line, and a capacitor provided between the midpoint in the second branch wiring and the valve, and configured to output a state in which a voltage is supplied to the valve and a state in which a voltage is not supplied to the valve. the first branch wiring and the second connecting line connecting the switching circuit, wherein when a voltage is generated by the power supply and a voltage is input to the switching circuit via the power supply line, the wiring, the first branch wiring, and the second connecting line, the switching circuit switches to a state in which no voltage is supplied to the valve, and when no voltage is generated by the power supply and no voltage is input to the switching circuit via the power supply line, the wiring, the first branch wiring, and the second connecting line, the switching circuit switches to a state in which voltage is supplied to the valve by discharging the capacitor.
From another point of view, the liquid ejection device of the present invention includes a liquid ejection head having a nozzle for ejecting liquid, a liquid storage chamber for storing liquid, an atmosphere communication passage for communicating the liquid storage chamber with the outside, and a liquid storage section having an electrically operated valve capable of selectively taking either a communication state for communicating the atmosphere communication passage or a blocking state for blocking the atmosphere communication passage, a liquid flow path connecting the liquid ejection head and the liquid storage chamber so that liquid can flow, a power source for generating a voltage, a power line connected to the power source, and a supply section for supplying the voltage generated by the power source and input via the power line to the liquid ejection head and the valve, the supply section being capable of switching the supply destination of the voltage. The power source generates a voltage of a magnitude required to drive the liquid ejection head, and the supply section has a transformer circuit for changing the voltage input via the power line to a magnitude required to drive the valve.

The liquid ejection device of the present invention can supply a voltage generated by a single power supply and input to a supply unit via a single power supply line to the liquid ejection head and valves. This allows the number of power supplies and power supply lines to be reduced, making it possible to miniaturize the device.

1 is a schematic perspective view of a printer according to a first embodiment of the present invention; 2 is a vertical sectional view showing a schematic internal structure of the printer shown in FIG. 1 . 3A and 3B show the ink tank and the ink-jet head shown in FIG. 2, in which FIG. 3A is a front view and FIG. FIG. 4 is a plan view of the inkjet head shown in FIG. 3 . 5 is a cross-sectional view taken along line VV in FIG. 4. 1 is a diagram showing the installation status of a control board, a relay board, and an FFC connecting these two boards. 7A and 7B are circuit diagrams of the voltage supply unit shown in FIG. 6, in which (a) shows a case where a voltage is being input from a power supply, and (b) shows a case where the voltage from the power supply is stopped. FIG. 2 is a block diagram showing the electrical configuration of the printer shown in FIG. 1 . 13 is a diagram showing the installation state of a control board, a relay board, and an FFC connecting these boards in a printer according to a second embodiment of the invention. FIG.

First Embodiment
A printer 1 according to a first embodiment of the present invention will be described below. The printer 1 is installed and used in the state shown in Fig. 1. In this embodiment, the three directions indicated by arrows in Fig. 1 are the up-down direction A1, the front-rear direction A2, and the left-right direction A3. The three directions shown in Fig. 1 are also reflected and shown in Figs. 2 to 6.

<Outline of Printer 1>
As shown in FIG. 1, the printer 1 has a housing 11 having a generally rectangular parallelepiped shape. An opening 12 is formed in the approximate center of a front wall 11a of the housing 11. A paper feed tray 15 and a paper discharge tray 16 are provided in the opening 12 in two stages, one above the other. The paper feed tray 15 is configured to be insertable and removable in the front-rear direction A2 from the opening 12, that is, to be detachable from the housing 11. Paper P of a desired size (e.g., A4 size) is placed on the paper feed tray 15. The printer 1 can be connected to an external device such as a personal computer (hereinafter referred to as a PC). The printer 1 executes a printing operation based on printing data from the PC or the like.

As shown in FIG. 1, an operation unit 13 is provided on the upper part of the front wall 11a. The operation unit 13 is composed of buttons that are operated for various settings, a liquid crystal display that displays various information, and the like. In this embodiment, the operation unit 13 is composed of a touch panel that has the functions of both buttons and a liquid crystal display.

As shown in Figs. 1 and 2, the housing 11 has an opening/closing cover 14 that forms the ceiling portion. The opening/closing cover 14 is configured to be rotatable around a rotation axis (not shown) that is aligned with the left-right direction A3 at the rear end. By opening the opening/closing cover 14, an ink tank 61 (described below) that is arranged inside the housing 11 is exposed, and it becomes possible to inject ink into the ink tank 61 to refill it.

<Internal structure of printer 1>
Next, a description will be given of the internal structure of the printer 1. As shown in Fig. 2, the printer 1 includes a feed unit 20, a pair of transport rollers 35, a recording unit 40, a pair of paper discharge rollers 36, an ASF (Auto Sheet Feed) motor 20M (see Fig. 8), an LF (Line Feed) motor 30M (see Fig. 8), a control unit 5 (see Fig. 8), and a power source 6 (see Figs. 6 and 8).

As shown in FIG. 2, the feeding unit 20 feeds the paper P placed on the paper feed tray 15 to the transport path 25. The transport roller pair 35 transports the paper P fed by the feeding unit 20 to the recording unit 40. The recording unit 40 has, for example, an inkjet recording system configuration, and records an image on the paper P transported by the transport roller pair 35. The paper discharge roller pair 36 discharges the paper P recorded by the recording unit 40 to the paper discharge tray 16.

<Feeding section 20>
As shown in FIG. 2, the feeding unit 20 is provided above the paper feed tray 15. The feeding unit 20 has a paper feed roller 21 and an arm 22. The paper feed roller 21 is supported on the tip of the arm 22. The arm 22 is supported rotatably on a support shaft 22a. The arm 22 is biased by a spring or the like in a direction in which the paper feed roller 21 contacts the paper feed tray 15 (in a direction in which the paper feed roller 21 rotates downward). The arm 22 is configured to be able to retract upward when the paper feed tray 15 is attached or detached. The paper feed roller 21 rotates by the power of the ASF motor 20M transmitted via a transmission mechanism (not shown). As a result, the paper P loaded in the paper feed tray 15 is fed to the transport path 25.

<Paper Feed Tray 15>
2, the paper feed tray 15 has an inclined wall portion 15a. The inclined wall portion 15a guides the paper P placed on the paper feed tray 15 to the transport path 25 when the paper P is fed by the paper feed roller 21.

<Transport path 25>
2, the transport path 25 is formed inside the housing 11 and bends upward from the rear end of the paper feed tray 15 toward the front side of the printer 1. The paper P fed from the paper feed tray 15 is guided by the transport path 25 so as to make a U-turn from below to above, and reaches the recording unit 40.

<Conveying Roller Pair 35 and Paper Discharge Roller Pair 36>
The conveying roller pair 35 has a conveying roller 35a disposed on the lower side and a pinch roller 35b disposed on the upper side. The conveying roller 35a rotates by the power of the LF motor 30M transmitted through a transmission mechanism (not shown). The pinch roller 35b rotates with the rotation of the conveying roller 35a. The conveying roller 35a and the pinch roller 35b rotate while sandwiching the paper P from the vertical direction A1, and convey the paper P to the recording unit 40.

The pair of discharge rollers 36 has a discharge roller 36a arranged on the lower side and a spur roller 36b arranged on the upper side. The discharge roller 36a rotates by the power of the LF motor 30M transmitted via a transmission mechanism (not shown). The spur roller 36b rotates with the rotation of the discharge roller 36a. The discharge roller 36a and the spur roller 36b rotate while clamping the paper P from the vertical direction A1, and transport the paper P to the discharge tray 16.

<Recording unit 40>
2 and 3, the recording unit 40 includes an inkjet head 41, an ink tank 61, a relay board 80 (a "sub-board" of the present invention), a carriage 70, a moving mechanism 71, and a platen 17. The carriage 70 moves back and forth in a scanning direction (a left-right direction A3, a direction perpendicular to the conveying direction of the paper P). The inkjet head 41 and the ink tank 61 are supported by the carriage 70. That is, the printer 1 in this embodiment is a so-called on-carriage type in which the ink tank 61 and the inkjet head 41 are mounted on the carriage 70. The ink tank 61 in this embodiment is entirely located above the inkjet head 41. However, this is not limited thereto, and a part of the ink tank 61 may be located above the upper surface of the inkjet head 41, and the remaining part may be located below the upper surface.

<Ink Tank 61>
3, the ink tank 61 has a tank body 62, a cap 63, and an electromagnetic valve 64. The tank body 62 has a substantially rectangular parallelepiped shape, and has an ink storage chamber 62a formed therein for storing ink. Black ink is stored in the ink storage chamber 62a.

As shown in FIG. 3, the tank body 62 has a through hole 62c that penetrates its upper wall 62b. The through hole 62c is located in the center of the upper wall 62b in the left-right direction A3, slightly toward the front. A cylinder 66 is fitted into the through hole 62c. The cylinder 66 has an ink inlet 67 at its upper end. The ink inlet 67 is an opening that opens upward (i.e., toward the outside). The inner surface of the cylinder 66 defines an ink supply path 66a that runs from the ink inlet 67 to the ink storage chamber 62a. The ink inlet 67 connects the ink storage chamber 62a to the outside.

The cap 63 shown in FIG. 3 is made of, for example, a flexible resin. The cap 63 can be attached and detached to the upper end of the cylinder 66 by a user operation, and closes or opens the ink inlet 67. The ink inlet 67 is normally closed by the cap 63, and is opened by removing the cap 63 from the cylinder 66 when injecting ink into the ink storage chamber 62a.

As shown in FIG. 3(b), the tank body 62 has an air communication passage 62e that penetrates the rear side wall 62d and connects the ink storage chamber 62a to the outside. The air communication passage 62e is located near the upper end of the rear side wall 62d.

As shown in FIG. 3(b), the electromagnetic valve 64 is a known two-way electromagnetic valve and has a valve portion 64a and a solenoid portion 64b. The electromagnetic valve 64 is fixed to the upper wall 62b. The valve portion 64a is disposed in the ink storage chamber 62a and has an internal flow path (not shown) that communicates with the air communication passage 62e and the ink storage chamber 62a, and a valve (not shown) that opens and closes the internal flow path. The solenoid portion 64b is disposed on the upper wall 62b and opens and closes the valve of the valve portion 64a.

When no voltage is supplied to the solenoid portion 64b, the electromagnetic valve 64 is in a blocking state (i.e., the valve closes the internal passage) that blocks communication between the atmosphere communication passage 62e and the ink storage chamber 62a. When a voltage generated by the power source 6 (FIGS. 6 and 8) is supplied to the solenoid portion 64b, the electromagnetic valve 64 is in a communicating state (i.e., the valve opens the internal passage) that connects the atmosphere communication passage 62e and the ink storage chamber 62a. In other words, the electromagnetic valve 64 selectively takes either a blocking state or a communicating state. By setting the electromagnetic valve 64 to a communicating state, the negative pressure in the ink storage chamber 62a can be released.

As a modified example, the solenoid valve 64 may have the valve portion 64a connected outside the ink tank 61 so as to be able to communicate between the atmosphere communication passage 62e and the outside. In this way, it is possible to selectively take a communication state in which the atmosphere communication passage 62e is connected to the outside and a blocking state in which communication with the outside is blocked. The entire solenoid valve 64 may also be disposed in the ink storage chamber 62a. The solenoid valve 64 may also be fixed and installed to at least one of the front, rear, left, and right side walls other than the top wall 62b of the tank body 62, as long as the internal flow path of the valve portion 64a is connected so as to be able to communicate with the atmosphere communication passage 62e.

In addition, the tank body 62 is formed with an outlet 62h that penetrates the bottom wall 62g and allows the ink in the ink storage chamber 62a to flow out to the inkjet head 41. The outlet 62h is located in the center of the bottom wall 62g in the left-right direction A3, near the front end.

<Inkjet head 41>
Black ink is supplied to the inkjet head 41 from an ink tank 61. The inkjet head 41 ejects ink from a plurality of nozzles 42 formed on a nozzle surface 41a (see FIG. 5), which is the lower surface of the inkjet head 41. To explain in more detail, as shown in FIG. 4, the plurality of nozzles 42 form a nozzle row that is aligned in the front-rear direction A2, that is, the transport direction of the paper P. Black ink is ejected from the plurality of nozzles 42. As shown in FIGS. 4 and 5, the inkjet head 41 has a flow passage unit 43 and a piezoelectric actuator 50.

<Flow path unit 43>
As shown in Fig. 5, the flow passage unit 43 is formed by stacking four plates 43a to 43d in order from the top. A plurality of nozzles 42 are formed in the plate 43d, as shown in Figs. 4 and 5. A plurality of pressure chambers 45 are formed in the plate 43a. Further, a pressure chamber 45 is provided for each nozzle 42, and the right end portion overlaps with the nozzle 42 in the up-down direction A1.

As shown in Figures 4 and 5, the plate 43b has a circular through hole 46a formed in a portion that overlaps with the left end of each pressure chamber 45 in the vertical direction A1. The plate 43b also has a circular through hole 46b formed in a portion that overlaps with the right end of each pressure chamber 45 and the nozzle 42 in the vertical direction A1.

As shown in Figs. 4 and 5, a manifold flow path 47 is formed in the plate 43c. The manifold flow path 47 extends in the front-rear direction A2 (transport direction) and overlaps with the left portions of the multiple pressure chambers 45 in the up-down direction A1. This allows each pressure chamber 45 to communicate with the manifold flow path 47 via the through-hole 46a. Also, as shown in Fig. 4, a supply port 48 is provided at the downstream end of the manifold flow path 47 in the transport direction. The supply port 48 opens to the upper surface of the flow path unit 43 (i.e., the upper surface of the plate 43a).

As shown in FIG. 3, the inkjet head 41 is connected to the ink tank 61 via a connection member 69. The connection member 69 is formed with a communication passage 69a (the "liquid flow passage" of the present invention) that connects the outlet 62h and the supply port 48. This allows ink in the ink storage chamber 62a in the ink tank 61 to be supplied to the manifold flow passage 47 via the supply port 48.

As shown in Figures 4 and 5, the plate 43c has circular through holes 49 formed in the portions that overlap with the through holes 46b and the nozzles 42 in the up-down direction A1. This allows each nozzle 42 to communicate with the pressure chamber 45 via the through holes 46b and 49.

In the flow path unit 43, an individual flow path 44 is formed by the nozzle 42, the pressure chamber 45, through holes 46b and 49 that connect the nozzle 42 and the pressure chamber 45, and a through hole 46a that connects the pressure chamber 45 to the manifold flow path 47. A plurality of individual flow paths 44 are formed corresponding to the plurality of nozzles 42.

<Piezoelectric Actuator 50>
5, the piezoelectric actuator 50 has a vibration plate 51, a piezoelectric layer 52, a common electrode 53, and a plurality of individual electrodes 54. The vibration plate 51 is made of a piezoelectric material containing lead zirconate titanate as a main component, and is disposed on the upper surface of the flow path unit 43, covering the plurality of pressure chambers 45. Unlike the piezoelectric layer 52, the vibration plate 51 may be made of an insulating material other than a piezoelectric material.

The piezoelectric layer 52 is made of a piezoelectric material and is disposed on the upper surface of the vibration plate 51. As shown in FIG. 4, the piezoelectric layer 52 extends continuously across the multiple pressure chambers 45. As shown in FIG. 5, the common electrode 53 is disposed between the vibration plate 51 and the piezoelectric layer 52, and extends continuously across the multiple pressure chambers 45. The common electrode 53 is connected to the power source 6 via wiring members (FPC (Flexible Printed Circuits) 96, COF (Chip On Film) 95) and the like, which will be described later, and is held at ground potential.

As shown in FIG. 4, the individual electrodes 54 correspond to the pressure chambers 45 individually. The individual electrodes 54 have an elliptical planar shape that is slightly smaller than the pressure chambers 45, are arranged on the upper surface of the piezoelectric layer 52, and overlap the center of the pressure chamber 45 in the vertical direction A1. The left end of the individual electrode 54 extends to a position where it does not overlap the pressure chamber 45 in the vertical direction A1. The left end of the individual electrode 54 serves as a connection terminal 54a to which the COF 95 described below is connected. The individual electrodes 54 are connected to a driver IC 59 (see FIG. 8) mounted on the COF 95. The driver IC 59 selectively applies either a ground potential or a predetermined drive potential (for example, about 20 V) to each of the individual electrodes 54 individually.

The portions of the piezoelectric layer 52 sandwiched between the common electrode 53 and each individual electrode 54 are polarized in the vertical direction A1. In the piezoelectric actuator 50, the portions of the vibration plate 51, the piezoelectric layer 52, and the common electrode 53 that overlap each pressure chamber 45 in the vertical direction, and the portions formed by the individual electrodes 54 each serve as drive elements 55 that apply pressure to the ink in the pressure chambers 45.

Here, a method of driving the piezoelectric actuator 50 to eject ink from the nozzle 42 will be described. In the piezoelectric actuator 50, all individual electrodes 54 are held in advance at the same ground potential as the common electrode 53. When ejecting ink from a certain nozzle 42, the potential of the individual electrode 54 in the drive element 55 corresponding to that nozzle 42 is switched from the ground potential to the drive potential. Then, due to the potential difference between the individual electrode 54 and the common electrode 53, the portion of the vibration plate 51 and the piezoelectric layer 52 that overlaps with the pressure chamber 45 in the up-down direction A1 is deformed so as to be convex toward the pressure chamber 45 as a whole. This reduces the volume of the pressure chamber 45, increasing the pressure of the ink in the pressure chamber 45, and ink is ejected from the nozzle 42 that communicates with the pressure chamber 45.

<Platen 17>
The platen 17 is disposed below the inkjet head 41 and supports the paper P transported by the transport roller pair 35. The platen 17 is disposed in a portion of the reciprocating movement range of the carriage 70 through which the paper P passes. Since the width of the platen 17 is sufficiently larger than the maximum width of the paper P that can be transported, the paper P transported along the transport path 25 always passes over the platen 17.

<Movement mechanism 71>
As shown in Fig. 2, the movement mechanism 71 includes a pair of guide rails 72 and a belt transmission mechanism (not shown). The pair of guide rails 72 are disposed apart in the front-rear direction A2 and extend parallel to each other in the left-right direction A3. The carriage 70 is disposed so as to straddle the pair of guide rails 72. The carriage 70 is connected to a carriage motor 70M (see Fig. 8) via the belt transmission mechanism, and when the carriage motor 70M is driven, the belt transmission mechanism is driven. As a result, the carriage 70 moves in the scanning direction (left-right direction A3) along the pair of guide rails 72 together with the ink tank 61 and the inkjet head 41.

The inkjet head 41 ejects ink from the nozzles 42 under the control of the control unit 5 based on the recording data. In other words, as the carriage 70 moves back and forth in the left-right direction A3, the inkjet head 41 scans the paper P and ejects ink from the nozzles 42, thereby recording an image on the paper P transported over the platen 17.

<Relay Board 80>
6, the relay board 80 is connected to a control board 7 (the "main board" of the present invention) on which a control unit 5 and a power supply 6 are mounted, via an FFC (Flexible Flat Cable) 8. This allows a control signal generated by the control unit 5 and a voltage generated by the power supply 6 to be input to the relay board 80 via the FFC 8, as will be described in detail later. Note that the connection between the relay board 80 and the control board 7 may be made by an FPC (Flexible Printed Circuits) or other connecting member.

The relay board 80 is supported by the carriage 70 and is disposed behind the ink tank 61 in an upright position along the vertical direction A1 as shown in FIG. 3(b). As shown in FIG. 6, the relay board 80 has a rectangular planar shape. The relay board 80 is provided with three connection parts 82 to 84, a voltage supply part 90, and a signal wiring 88.

<Connections 82 to 84>
The connection part 82 is disposed near the center of the right end part of the relay board 80 as shown in Fig. 6. One end of the FFC 8 is connected to the connection part 82. The connection part 83 is disposed near the center of the lower end part of the relay board 80. As shown in Fig. 3(b), the connection part 83 is connected to an FPC 96 which is connected to a COF 95 which is connected to the piezoelectric actuator 50 of the inkjet head 41. As shown in Fig. 6(b), the connection part 84 is disposed near the center of the upper end part of the relay board 80. As shown in Fig. 3(b), a wiring 97 which is connected to the electromagnetic valve 64 is connected to the connection part 84.

<Voltage supply unit 90>
The voltage supply unit 90 supplies a voltage input via a power line 8a (described later) of the FFC 8 to the inkjet head 41 and the electromagnetic valve 64. As shown in Fig. 6, the voltage supply unit 90 has a power supply line 91 (the "line" of the present invention), a head line 91a (the "first branch line" of the present invention), a valve line 91b (the "second branch line" of the present invention), a drive circuit 92, and a connection line 93 (the "second connection line" of the present invention).

One end of the power supply wiring 91 is connected to the connection part 82. In other words, the power supply wiring 91 is connected to the power supply line 8a of the FFC 8 that is connected to the connection part 82. The head wiring 91a and the valve wiring 91b are each formed by branching off the end of the power supply wiring 91 opposite the end connected to the connection part 82.

The head wiring 91a is connected to the connection part 83 at the end opposite the power supply wiring 91. That is, the head wiring 91a is connected to the inkjet head 41 via the connection part 83, the FPC 96, and the COF 95.

The valve wiring 91b has an end opposite to the power supply wiring 91 connected to the connection part 84. The drive circuit 92 is disposed midway along the valve wiring 91b. That is, the valve wiring 91b is connected to the electromagnetic valve 64 via the drive circuit 92, the connection part 84, and the wiring 97.

As shown in FIG. 7, the drive circuit 92 has a connection line 94 (the "first connection line" of the present invention), a capacitor 85, a switching circuit 86, and a diode 87.

The connection line 94 connects the midpoint 94a on the valve wiring 91b to ground. The capacitor 85 is provided on the connection line 94. The capacitor 85 is charged by the voltage input to the valve wiring 91b via the power line 8a, the connection part 82, and the power wiring 91.

The switching circuit 86 is provided between the midpoint 94a of the valve wiring 91b and the connection part 84. The portion of the valve wiring 91b closer to the power supply wiring 91 than the switching circuit 86 is called the first part 91b1, and the portion of the valve wiring 91b closer to the connection part 84 than the switching circuit 86 is called the second part 91b2. The connection line 93 connects the midpoint 93a on the head wiring 91a to the switching circuit 86. The configuration of the switching circuit 86 will be described in detail later.

The diode 87 is provided between the power supply wiring 91 and the midpoint 94a in the first portion 91b1 of the valve wiring 91b. The diode 87 prevents the flow of electricity from the midpoint 94a toward the power supply wiring 91.

Now, the switching circuit 86 will be described in more detail. The switching circuit 86 can switch between a state in which a voltage is supplied to the electromagnetic valve 64 and a state in which a voltage is not supplied to the electromagnetic valve 64. The switching circuit 86 is a transistor or an LDO (Low Drop Out).

The VDD terminal of the switching circuit 86 is connected to the end of the first part 91b1 of the valve wiring 91b opposite to the end of the power supply wiring 91 side. The VOUT terminal of the switching circuit 86 is connected to the end of the second part 91b2 of the valve wiring 91b opposite to the end of the connection part 84 side. The CE terminal of the switching circuit 86 is connected to the end of the connection line 93 opposite to the end of the midpoint 93a side. The voltage generated by the power supply 6 is input to the CE terminal of the switching circuit 86 via the power supply line 8a of the FFC 8, the power supply wiring 91, the head wiring 91a, and the connection line 93.

The switching circuit 86 functions as a transformer circuit that changes the voltage input via the VDD terminal to a voltage (=V2) required to drive the solenoid valve 64. In this embodiment, the power source 6 generates a voltage (=V1) required to drive the inkjet head 41. Let us assume that V1>V2. The switching circuit 86 steps down the voltage (=V1) input via the VDD terminal to V2. If V1<V2, the switching circuit 86 steps up the voltage (=V1) input via the VDD terminal to V2.

When a voltage is generated by the power source 6 and a voltage is input to the CE terminal, the switching circuit 86 switches to a state where no voltage is supplied to the solenoid valve 64. When a voltage is not generated by the power source 6 and a voltage is not input to the CE terminal, the switching circuit 86 switches to a state where a voltage is supplied to the solenoid valve 64 by discharging the capacitor 85.

<Signal wiring 88>
6 , one end of the signal wiring 88 is connected to the connection portion 82. The signal wiring 88 is connected to a signal line 8b (described later) of the FFC 8 connected to the connection portion 82. The other end of the signal wiring 88 is connected to the connection portion 83. That is, the signal wiring 88 is connected to the inkjet head 41 via the connection portion 83, the FPC 96, and the COF 95.

<FFC8>
6, a power line 8a and a signal line 8b are formed on the FFC 8, each of which has one end connected to a connection portion 7a of the control board 7 and the other end connected to a connection portion 82 of the relay board 80. The other end of the power line 8a is connected to a power supply wiring 91 via the connection portion 82. The other end of the signal line 8b is connected to a signal wiring 88 via the connection portion 82. The power line 8a inputs a voltage generated by the power source 6 to the voltage supply unit 90. The signal line 8b transmits a control signal from the control unit 5 to the inkjet head 41.

<Control unit 5>
As shown in Fig. 8, the control unit 5 has a CPU (Central Processing Unit) 131, an ASIC (Application Specific Integrated Circuit) 135, and a memory 140. The CPU 131, the ASIC 135, and the memory 140 are mounted on a control board 7 (see Fig. 6). As shown in Fig. 6, the ASIC 135 is connected to signal wirings 7b and 7c provided on the control board 7. The end of the signal wiring 7b opposite to the ASIC 135 side is connected to the power supply 6. The end of the signal wiring 7c opposite to the ASIC 135 side is connected to a connection portion 7a of the control board 7.

Returning to FIG. 8, the CPU 131, ASIC 135, and memory 140 are connected by an internal bus 137. The memory 140 includes a ROM (Read Only Memory) 132, a RAM (Random Access Memory) 133, and an EEPROM (Electrically Erasable Programmable Read-Only Memory) 134. The ROM 132 stores programs for controlling various operations of the printer 1. The CPU 131 executes the programs using the RAM 133 and the EEPROM 134. Note that at least one of the CPU 131 and the memory 140 may not be mounted on the control board 7, but may be provided separately.

The ASIC 135 outputs control signals to the ASF motor 20M, the LF motor 30M, the carriage motor 70M, the inkjet head 41, the power supply 6, etc., and controls their operation. For example, the control unit 5 controls the inkjet head 41, the ASF motor 20M, the LF motor 30M, the carriage motor 70M, etc., based on the recording data transmitted from an external device (e.g., a PC or a smartphone), alternately performs a conveying process and a recording process, and records an image, etc., on the paper P. The control unit 5 also controls the on/off of the power supply 6. For example, the control unit 5 controls the on/off of the power supply 6 on a recording job basis. That is, the control unit 5 turns on the power supply 6 while the image related to one recording job is being recorded, and turns off the power supply 6 when the image related to one recording job is completed.

In this embodiment, the ASIC 135 is connected to the ASF motor 20M, the LF motor 30M, and the carriage motor 70M by individual wiring (not shown), and controls these motors 20M, 30M, and 70M.

In this embodiment, the control unit 5 has one CPU and one ASIC, but the control unit 5 may include only one ASIC, which performs all the necessary processing, or it may include multiple ASICs, which share the necessary processing.

<Power supply 6>
As shown in Fig. 6, the power supply 6 is mounted on the control board 7. The power supply 6 is a regulator or the like, and generates a voltage of a magnitude required to drive the inkjet head 41 from a voltage supplied from an external power supply. The power supply 6 is connected to the ASIC 135 of the control unit 5 by a signal wiring 7b. One end of a power supply wiring 7d is connected to the other end of the power supply 6, the other end of which is connected to the connection portion 7a. That is, the power supply 6 is connected to a power supply line 8a of the FFC 8 via the power supply wiring 7d and the connection portion 7a. The end of the power supply line 8a opposite to the end connected to the power supply 6 is connected to a power supply wiring 91 via a connection portion 82.

<Operation of voltage supply unit 90>
Here, the operation of the voltage supply unit 90 will be described with reference to Fig. 7. When the power supply 6 is turned on under the control of the control unit 5, the voltage generated by the power supply 6 is input to the power supply wiring 91 of the voltage supply unit 90 via the connection part 82 of the relay board 80, as shown in Fig. 7(a). The voltage input to the power supply wiring 91 is supplied to the head wiring 91a and the valve wiring 91b, respectively.

The voltage supplied to the head wiring 91a is supplied to the inkjet head 41 via the connection 83 of the relay board 80. The voltage supplied to the head wiring 91a is also input to the CE terminal of the switching circuit 86 via the connection line 93. When the voltage is input to the CE terminal, the switching circuit 86 is in a state where no voltage is supplied to the solenoid valve 64.

Meanwhile, the voltage supplied to the valve wiring 91b is charged to the capacitor 85. As described above, at this time the switching circuit 86 is in a state where no voltage is supplied to the electromagnetic valve 64, so the voltage supplied to the valve wiring 91b is not supplied to the electromagnetic valve 64 via the connection part 84.

When the power supply 6 is turned off by the control of the control unit 5, as shown in FIG. 7(b), the input of voltage from the power supply 6 stops and the capacitor 85 discharges. At this time, the diode 87 prevents the flow of electricity from the midpoint 94a toward the power supply wiring 91. Also, since no voltage is input to the CE terminal of the switching circuit 86, the switching circuit 86 is in a state in which voltage is supplied to the electromagnetic valve 64 by the discharge of the capacitor 85. Therefore, the discharge of the capacitor 85 supplies voltage to the electromagnetic valve 64 via the connection part 84.

In this way, the voltage supply unit 90 can switch the supply destination of the voltage generated by the power source 6. Specifically, the voltage supply unit 90 supplies voltage to the inkjet head 41 when the power source 6 is on, and supplies voltage to the solenoid valve 64 when the power source 6 is off. The voltage supply unit 90 exclusively switches the supply destination of the voltage. In other words, the voltage supply unit 90 does not supply voltage to both the inkjet head 41 and the solenoid valve 64 at the same time.

<Features of the First Embodiment>
As described above, the printer 1 of the above-described embodiment comprises a power supply 6 that generates a voltage, a power line 8a connected to the power supply 6, and a voltage supply unit 90 that supplies the voltage generated by the power supply 6 and input via the power line 8a to the inkjet head 41 and the solenoid valve 64, and the voltage supply unit 90 is capable of switching the destination of the voltage supply.

According to the above-mentioned configuration, the voltage generated by one power source 6 and input to the voltage supply unit 90 via one power line 8a can be supplied to the inkjet head 41 and the electromagnetic valve 64. Therefore, the number of power sources 6 and the number of power lines 8a can be reduced, making it possible to miniaturize the device.

The printer 1 of the above embodiment further includes a control board 7 on which the power supply 6 is mounted, and a relay board 80 to which the inkjet head 41 and the electromagnetic valve 64 are connected, and the power supply wires 8a are formed on the FFC 8. In this embodiment, the number of power supplies 6 and the number of power supply wires 8a can be reduced, and the size of the control board 7 and the width of the FFC 8 can be reduced.

Furthermore, in the printer 1 of the above embodiment, the voltage supply unit 90 has a power supply wiring 91 connected to the power supply 6 of the power line 8a, a head wiring 91a connected to the inkjet head 41 and a valve wiring 91b connected to the electromagnetic valve 64, a connection line 94 connecting a midpoint 94a of the valve wiring 91b to ground, a capacitor 85 provided on the connection line 94, a switching circuit 86 provided on the valve wiring 91b and capable of switching between a state in which a voltage is supplied to the electromagnetic valve 64 and a state in which a voltage is not supplied to the electromagnetic valve 64, and a connection line 93 connecting the head wiring 91a and the switching circuit 86. When a voltage is generated by the power supply 6 and a voltage is input to the switching circuit 86 via the connection line 93, the switching circuit 86 switches to a state in which no voltage is supplied to the electromagnetic valve 64, and when a voltage is not generated by the power supply 6 and a voltage is not input to the switching circuit 86 via the connection line 93, the switching circuit 86 switches to a state in which a voltage is supplied to the electromagnetic valve 64 by discharging the capacitor 85. Therefore, the voltage supply unit 90 does not require a control signal to switch the voltage supply destination, so no signal lines are required to supply the control signal, making it possible to further miniaturize the device.

In addition, in the printer 1 of the above embodiment, a diode 87 is provided between the power supply wiring 91 and the midpoint 94a in the valve wiring 91b to prevent the flow of electricity from the midpoint 94a toward the power supply wiring 91. Therefore, when the capacitor 85 is discharged, electricity flows through the valve wiring 91b from the midpoint 94a toward the power supply wiring 91, preventing voltage from being supplied to the inkjet head 41.

In addition, in the printer 1 of the above embodiment, the power supply 6 generates a voltage of a magnitude required to drive the inkjet head 41, and the switching circuit 86 of the voltage supply unit 90 functions as a transformer circuit that changes the voltage input via the power line 8a to a magnitude required to drive the solenoid valve 64. Therefore, a voltage of an appropriate magnitude can be supplied to the solenoid valve 64.

Second Embodiment
Next, a printer according to a second embodiment of the present invention will be described with reference to Fig. 9. The printer of this embodiment differs from the printer 1 of the first embodiment mainly in the configuration of a voltage supply unit 290 provided on a relay board 280. Hereinafter, components having the same configuration as those of the first embodiment will be given the same reference numerals and their description will be omitted as appropriate.

The control board 207 of this embodiment is provided with two signal wires 7c1 and 7c2, one end of which is connected to the ASIC 135 and the other end of which is connected to the connection part 7a. In addition, the FFC 208 is provided with a power line 8a and two signal wires 8b1 and 8b2, one end of which is connected to the connection part 7a of the control board 7 and the other end of which is connected to the connection part 82 of the relay board 80. The signal line 8b1 is connected to the signal wire 7c1 via the connection part 7a of the control board 207. The signal line 8b2 is connected to the signal wire 7c2 via the connection part 7a of the control board 207. The signal line 8b2 is connected to the other end of the signal wire 88, one end of which is connected to the connection part 83 in the relay board 280.

The voltage supply unit 290 has a switching circuit 286 mounted on the relay board 280. The switching circuit 286 switches the supply destination of the input voltage between the inkjet head 41 and the electromagnetic valve 64. The switching circuit 286 exclusively switches the supply destination of the voltage. The switching circuit 286 also functions as a transformer circuit.

The switching circuit 286 is connected to one end of a power supply wire 291, the other end of which is connected to the connection part 82. The power supply wire 291 is connected to the power supply line 8a of the FFC 8, which is connected to the connection part 82. As a result, the voltage generated by the power supply 6 is input to the switching circuit 286 via the power supply wire 7d, the power supply line 8a, the connection part 82, and the power supply wire 291.

The switching circuit 286 is also connected to one end of a signal wiring 289, the other end of which is connected to the connection part 82. The signal wiring 289 is connected to the signal line 8b1 of the FFC 208, which is connected to the connection part 82. As a result, the control signal generated by the ASIC 135 is input to the switching circuit 286 via the signal wiring 7c1, the signal line 8b1, the connection part 82, and the signal wiring 289.

The switching circuit 286 is connected to one end of the head wiring 291a, the other end of which is connected to the connection portion 83. The head wiring 291a is connected to the inkjet head 41 via the connection portion 83, the FPC 96, and the COF 95. The switching circuit 286 is connected to the other end of the valve wiring 291b, the other end of which is connected to the connection portion 84. The valve wiring 291b is connected to the electromagnetic valve 64 via the connection portion 84 and wiring 97.

The ASIC 135 generates a switching signal as one of the control signals to instruct the switching circuit 286 to switch the voltage supply destination. The switching signal is a signal that instructs the switching circuit 286 to switch the voltage supply destination to either the inkjet head 41 or the solenoid valve 64. For example, the switching signal instructs the switching circuit 286 to switch the voltage supply destination to the inkjet head 41 while the image for one recording job is being recorded, and instructs the switching circuit 286 to switch the voltage supply destination to the solenoid valve 64 when the image for one recording job is completed. Note that, although the first embodiment describes an example in which the power supply 6 is turned on/off by the control unit 5 for each recording job, in this embodiment, the power supply 6 is kept on continuously during the period in which multiple recording jobs are being executed.

The voltage generated by the power supply 6 is input to the switching circuit 286 via the power supply line 8a. In addition, the switching signal generated by the ASIC 135 is input to the switching circuit 286 via the signal line 8b1. The switching circuit 286 switches the supply destination of the voltage based on the switching signal.

<Features of the second embodiment>
As described above, in this embodiment, similarly to the first embodiment described above, a voltage generated by a single power source 6 and input to the voltage supply unit 290 via a single power line 8a can be supplied to the inkjet head 41 and the electromagnetic valve 64, so that the device can be made smaller.

In this embodiment, the device includes an ASIC 135 mounted on the control board 207 and a signal line 8b1 connected to the ASIC 135. The voltage supply unit 290 is mounted on the relay board 280, and includes a switching circuit 286 that receives voltage via the power line 8a and switches the voltage supply destination between the inkjet head 41 and the electromagnetic valve 64. The ASIC 135 generates a switching signal that instructs the switching circuit 286 to switch the voltage supply destination. The switching circuit 286 switches the voltage supply destination based on the switching signal generated by the ASIC 135 and input via the signal line 8b1. In this embodiment, the signal line 8b1 is required to supply the switching signal, but the power line for supplying the voltage is thicker than the signal line, making it possible to reduce the size of the device compared to the case where multiple power lines are provided.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration should not be considered to be limited to these embodiments. The scope of the present invention is indicated by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope equivalent to the claims.

In addition, in the first and second embodiments described above, the power line 8a constitutes a wiring formed on one FFC8 (208), but the power line 8a itself may be a single individual wiring.

In the above-mentioned first and second embodiments, a voltage is supplied to the inkjet head 41 while an image for one recording job is being recorded, and a voltage is supplied to the electromagnetic valve 64 when the image for one recording job is completed. However, the timing of switching the voltage supply destination is not limited to this. That is, for example, a negative pressure detection means for detecting the negative pressure in the ink storage chamber 62a may be provided, and a voltage may be supplied to the inkjet head 41 when the negative pressure in the ink storage chamber 62a is less than a predetermined value, and a voltage may be supplied to the electromagnetic valve 64 when the negative pressure in the ink storage chamber 62a becomes equal to or greater than the predetermined value.

Furthermore, in the above-mentioned first and second embodiments, the voltage supply unit 90 (290) exclusively switches the voltage supply destination, but this is not limited to the above. That is, for example, the voltage supply unit 90 (290) may switch the voltage supply destination between only the inkjet head 41 and both the inkjet head 41 and the solenoid valve 64.

In addition, in the above-mentioned first and second embodiments, the switching circuit 86 (286) functions as a transformer circuit, but this is not limited to this. A transformer circuit may be provided separately from the switching circuit 86 (286). Also, if the voltage (= V2) required to drive the solenoid valve 64 is equal to the voltage (= V1) required to drive the inkjet head 41, it is not necessary to provide something equivalent to a transformer circuit.

Furthermore, in the above-mentioned first embodiment, a diode 87 is provided to prevent backflow of electricity when the capacitor 85 is discharged, but the diode 87 may be omitted.

In addition, in the above embodiment, the present invention is applied to a monochrome printer, but the present invention may also be applied to a color printer.

In addition, in the above embodiment, the ink tank 61 is provided with an ink inlet 67 that connects the ink tank 61 to the outside, but the ink tank 61 does not have to be provided with an ink inlet 67.

In addition, in the above embodiment, the ink tank 61 is provided with an electromagnetic valve 64, but this is not limited to the above. In other words, the valve provided in the ink tank 61 may be an electrically driven valve, and for example, an electric valve driven by a motor may be used instead of the electromagnetic valve 64.

Furthermore, in the above embodiment, the ink tank 61 and the inkjet head 41 are described as being on-carriage type, in which they are mounted on the carriage 70, but this is not limited to this. In other words, the present invention can also be used in a line-type inkjet head in which the inkjet head is fixed without the carriage 70.

The present invention can also be applied to a liquid ejection device having a liquid ejection head that ejects liquid other than ink. Furthermore, the ejection target is not limited to paper P, but may be, for example, cloth, a substrate, etc. Also, it is possible to adopt an ejection energy imparting means other than the piezoelectric actuator 50, so long as it is possible to eject liquid from the nozzle by being driven based on a signal from the control unit 5. In this case, for example, a thermal type ejection energy imparting means may be adopted, in which a heating element heats the liquid ink in the nozzle, generating bubbles, and pushing the ink out of the nozzle to perform recording.

1. Printer (liquid ejection device)
5 Control unit 6 Power supply 7 Control board (main board)
8. FFC (flexible cable)
8a Power line 8b1 Signal line 35 Conveying roller pair (conveying mechanism)
41 Inkjet head (liquid ejection head)
61 Ink tank (liquid storage section)
62a Ink storage chamber (liquid storage chamber)
62e Atmospheric communication passage 64 Solenoid valve (valve)
69a Communication path (liquid flow path)
70: Carriage 71: Moving mechanism 80: Intermediate board (sub-board)
85 Capacitor 86 Switching circuit (transformer circuit)
87 Diode 90 Voltage supply unit (supply unit)
91 Power supply wiring (wiring)
91a Head wiring (first branch wiring)
91b Valve wiring (second branch wiring)
93 Connection line (second connection line)
94 Connection line (first connection line)
94a Midpoint 135 ASIC (control unit)
286 Switching circuit

Claims (6)

a liquid ejection head having a nozzle for ejecting liquid;
a liquid storage section including a liquid storage chamber for storing liquid, an atmosphere communication passage for communicating the liquid storage chamber with the outside, and an electrically operated valve capable of selectively taking either a communication state for communicating the atmosphere communication passage or a blocking state for blocking the atmosphere communication passage;
a liquid flow path that connects the liquid ejection head and the liquid storage chamber so that liquid can flow therethrough;
A power source for generating a voltage;
A main board on which the power supply is mounted;
a sub-substrate to which the liquid ejection head and the valve are connected;
A control unit mounted on the main board;
A signal line connected to the control unit;
A power line connected to the power source;
a supply unit that supplies a voltage generated by the power supply and input via the power supply line to the liquid ejection head and the valve,
The supply unit is capable of switching a supply destination of the voltage,
The power line is formed on a flexible cable,
the supply unit is mounted on the sub-substrate, and includes a switching circuit that receives a voltage via the power line and switches a supply destination of the voltage between the liquid ejection head and the valve;
The control unit generates a switching signal that instructs the switching circuit to switch a supply destination of a voltage,
The liquid ejection device , wherein the switching circuit switches a supply destination of a voltage based on the switching signal generated by the control unit and input via the signal line . a liquid ejection head having a nozzle for ejecting liquid;
a liquid storage section including a liquid storage chamber for storing liquid, an atmosphere communication passage for communicating the liquid storage chamber with the outside, and an electrically operated valve capable of selectively taking either a communication state for communicating the atmosphere communication passage or a blocking state for blocking the atmosphere communication passage;
a liquid flow path that connects the liquid ejection head and the liquid storage chamber so that liquid can flow therethrough;
A power source for generating a voltage;
A power line connected to the power source;
a supply unit that supplies a voltage generated by the power supply and input via the power supply line to the liquid ejection head and the valve,
The supply unit is capable of switching a supply destination of the voltage,
Further , the supply unit
a wiring connected to an end of the power line opposite to the end connected to the power supply;
the wiring is branched to form a first branch wiring connected to the liquid ejection head and a second branch wiring connected to the valve;
a first connection line connecting a midpoint on the second branch wiring to a ground;
a capacitor provided in the first connection line and charged by a voltage input to the second branch wiring via the power supply line;
a switching circuit provided between the midpoint of the second branch wiring and the valve, the switching circuit being capable of switching between a state in which a voltage is supplied to the valve and a state in which a voltage is not supplied to the valve;
a second connection line connecting the first branch wiring and the switching circuit,
The switching circuit includes:
When a voltage is generated by the power source and a voltage is input to the switching circuit via the power line, the wiring, the first branch wiring, and the second connection line, a state is switched to a state in which no voltage is supplied to the valve,
A liquid ejection device characterized in that when no voltage is generated by the power supply and no voltage is input to the switching circuit via the power supply line, the wiring, the first branch wiring, and the second connecting line, the device switches to a state in which voltage is supplied to the valve by discharging the capacitor. The liquid ejection device according to claim 2 , further comprising a diode provided between the wiring and the midpoint in the second branch wiring, the diode preventing a flow of electricity from the midpoint toward the wiring. a liquid ejection head having a nozzle for ejecting liquid;
a liquid storage section including a liquid storage chamber for storing liquid, an atmosphere communication passage for communicating the liquid storage chamber with the outside, and an electrically operated valve capable of selectively taking either a communication state for communicating the atmosphere communication passage or a blocking state for blocking the atmosphere communication passage;
a liquid flow path that connects the liquid ejection head and the liquid storage chamber so that liquid can flow therethrough;
A power source for generating a voltage;
A power line connected to the power source;
a supply unit that supplies a voltage generated by the power supply and input via the power supply line to the liquid ejection head and the valve,
The supply unit is capable of switching a supply destination of the voltage,
the power supply generates a voltage of a magnitude necessary to drive the liquid ejection head;
The liquid ejection device according to claim 1, wherein the supply unit has a transformer circuit that converts the voltage input via the power line into a voltage necessary for driving the valve. a conveying mechanism that conveys the recording medium in a conveying direction;
a carriage supporting the liquid ejection head and the liquid storage unit;
5. The liquid ejection device according to claim 1, further comprising a moving mechanism for moving a carriage in a scanning direction intersecting the transport direction. 6. The liquid ejection device according to claim 1, wherein the valve is an electromagnetic valve.

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