JPWO2016098535A1 - Deaeration device and inkjet recording device - Google Patents

Abstract

Provided are a deaeration device and an ink jet recording apparatus that can detect ink leakage more quickly. The deaeration device is provided in the middle of the ink flow path, and one surface of the gas permeable deaeration film, one surface of which is in contact with the ink in the ink flow path, the vacuum suction part, and the deaeration film Connect the opposite surface side to the vacuum suction part, and detect the vacuum path through which the desorbed gas that has been desorbed from the ink and permeated through the degassing film flows according to the suction operation of the vacuum suction part, and the ink leakage to the vacuum path A leakage detection unit that detects a state in the vacuum path and obtains a measurement value according to the state, and a comparison value for comparison with the latest measurement value. A comparison value calculation unit that calculates based on a history of past measurement values, and a determination unit that determines the presence or absence of ink leakage from the deaeration film based on a comparison result between the latest measurement value and the comparison value. Prepare.

Description

  The present invention relates to a deaeration device and an ink jet recording apparatus.

  2. Description of the Related Art Some conventional ink jet recording apparatuses include a deaeration device in an ink flow path. If gas (air) is contained in the ink, there is a problem in that ink discharge failure occurs from the nozzle opening due to the fact that the pressure applied when ink is discharged is not normally transmitted to the ink. By providing a deaeration device and removing the gas in the ink, it is possible to prevent such a state from occurring and to eject the ink normally.

  Conventionally, a degassing device uses a gas permeable membrane to bring one surface into contact with ink, and on the other side, the gas is sucked by a vacuum pump (vacuum suction unit), thereby allowing the gas in the flowing ink to be in a vacuum path. Many are used that have a configuration in which they are sucked and deaerated. In this degassing device, a pressure difference is always generated between both surfaces of a very thin gas-permeable membrane (for example, about 10 μm, etc.). Deterioration or damage may occur due to the above. When deterioration or breakage occurs, ink leaks to the decompression side, causing degassing performance to deteriorate, resulting in ejection failure.Furthermore, ink supply and ejection are not performed. It is necessary to detect and stop image formation.

On the other hand, in Patent Document 1, a gas-liquid separator (chamber) provided on the decompression side is taken into consideration that the amount of liquid (ink) permeation gradually increases as the gas permeable membrane gradually deteriorates. ) Discloses a technique for detecting the deterioration of the gas permeable membrane by detecting a change in the amount of liquid stored therein with a sensor.
In addition, as a method for detecting a sudden leak due to the breakage of the gas permeable membrane, Patent Document 2 provides a slope on the bottom surface of the chamber provided on the decompression side, and the leaked ink is provided at the lowest part of the slope surface. A technique for detecting ink leakage by quickly dropping into a vacuum port is disclosed. Further, in Patent Document 3, in a deaeration apparatus including a vacuum suction unit that is periodically switched on and off according to an increase or decrease in the degree of vacuum, when the switching period deviates from within a reference time, A technique for issuing a warning by judging that an abnormality has occurred is disclosed.

JP-A-9-85011 JP 2007-152182 A JP 2010-58413 A

  However, in these conventional techniques, there is a problem that it takes time to measure the amount of change in pressure and the integrated amount of ink leakage, and ink leakage cannot be detected quickly.

  An object of the present invention is to provide a deaeration device and an ink jet recording apparatus that can detect ink leakage more quickly.

In order to achieve the above object, the invention according to claim 1
A gas-permeable degassing membrane that is provided in the middle of the ink flow path and has one surface in contact with the ink in the ink flow path;
A vacuum suction section;
Desorption that connects the surface opposite to the one surface of the degassing membrane and the vacuum suction portion and desorbs from the ink in accordance with the suction operation of the vacuum suction portion and permeates the degassing membrane A vacuum path through which gas flows;
A leakage detector for detecting ink leakage into the vacuum path;
With
The leakage detector is
A detection unit that detects a state in the vacuum path and acquires a measurement value according to the state;
A comparison value calculation unit that calculates a comparison value for comparison with the latest measurement value based on a history of past measurement values;
A determination unit that determines the presence or absence of ink leakage from the deaeration film based on a comparison result between the latest measurement value and the comparison value;
It is a deaeration device characterized by comprising.

The invention described in claim 2 is the deaeration device according to claim 1,
The determination unit is configured to determine whether or not the ink has leaked based on whether or not a difference between the latest measurement value and the comparison value is equal to or greater than a predetermined reference difference.

Further, the invention described in claim 3 is the deaerator according to claim 2,
The reference difference is determined to be a predetermined ratio with respect to the comparison value.

The invention as defined in claim 4 is the deaerator according to claim 2 or 3,
An A / D converter that digitally converts the measurement value at a predetermined sampling frequency;
A storage unit that stores at least the most recent predetermined number of the digitally converted measurement values;
With
The comparison value calculation unit calculates the comparison value by performing a predetermined weighted average of the measurement values stored in the storage unit.

Further, the invention described in claim 5 is the deaerator according to claim 4,
The comparison value calculation unit performs the predetermined weighted average with a weight that becomes lighter according to an increase in elapsed time from the time when the measurement value is obtained until the time when the comparison value is calculated.

The invention as set forth in claim 6 is the deaerator according to claim 4 or 5,
The comparison value calculation unit calculates the comparison value by using, among the measurement values, an elapsed time from acquisition of the measurement value to calculation of the comparison value that is equal to or less than a predetermined upper limit time. It is said.

Moreover, invention of Claim 7 is a deaeration apparatus as described in any one of Claims 1-6,
The detection unit includes: a light emitting unit that causes light of a predetermined wavelength to enter the vacuum path; and a light receiving unit that receives the transmitted light after the incident light has transmitted at least part of the vacuum path. It is characterized by that.

The invention according to claim 8 is the deaeration device according to claim 7,
The light emitting unit is characterized in that infrared light is incident as the light having the predetermined wavelength.

Moreover, invention of Claim 9 is a deaeration apparatus as described in any one of Claims 1-8,
A chamber for separating the desorbed gas and liquid is provided in the middle of the vacuum path,
The detection unit detects a state in the vacuum path closer to the degassing membrane than the chamber.

The invention according to claim 10
A deaeration device according to any one of claims 1 to 9,
A recording head provided on the downstream side of the ink flow path for discharging ink;
An ink jet recording apparatus comprising:

The invention according to claim 11 is the ink jet recording apparatus according to claim 10,
An operation control unit is provided that controls an ink ejection operation in the recording head and stops the operation of the recording head when the ink leakage is detected by the leakage detection unit.

The invention according to claim 12 is the ink jet recording apparatus according to claim 11,
The operation control unit is characterized in that the operation of the recording head is stopped after the ink ejection related to the formation of the formation target image formed by the recording head at the timing when the ink leakage is detected.

The invention according to claim 13 is the ink jet recording apparatus according to claim 11 or 12,
A notification unit for performing a predetermined notification operation;
The operation control unit causes the notification unit to perform the predetermined notification operation when stopping the operation of the recording head.

  According to the present invention, there is an effect that ink leakage can be detected more quickly in the deaeration device and the inkjet recording device.

1 is a schematic diagram illustrating an overall configuration of an ink jet recording apparatus according to an embodiment of the present invention. It is a figure explaining the flow path of an ink. It is a figure for demonstrating the internal structure of a deaeration apparatus. It is a figure explaining the structure which concerns on the measurement by a detection part. It is a block diagram which shows the function structure of an inkjet recording device. It is a graph which shows the example of the time change of the light reception amount measured in the light-receiving part. It is a flowchart which shows the control procedure of an ink leak detection process. It is a figure explaining the modification of the structure which concerns on the measurement by a detection part. It is a modification of the block diagram which shows the function structure of an inkjet recording device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the ink jet recording apparatus of this embodiment will be described.
FIG. 1 is a schematic diagram showing an overall configuration of an inkjet recording apparatus 1 according to an embodiment of the present invention.

  The inkjet recording apparatus 1 includes a paper feeding unit 10, an image forming unit 20, a paper discharge unit 30, a control unit 40 (see FIG. 5), an ink supply unit 50, and the like. In the inkjet recording apparatus 1, the image forming unit 20 uses the ink supplied from the ink supply unit 50 to the recording medium P conveyed from the paper supply unit 10 to the image forming unit 20 based on the control of the control unit 40. After the image is formed, the recording medium P is discharged to the paper discharge unit 30.

  The paper feeding unit 10 holds the recording medium P on which image formation is performed, and supplies the recording medium P to the image forming unit 20 before image formation. The paper feed unit 10 includes a paper feed tray 11 and a transport unit 12.

  The paper feed tray 11 is a plate-like member provided so that one or a plurality of recording media P can be placed thereon. The paper feed tray 11 is provided so as to move up and down according to the amount of the recording medium P placed thereon, and is held at a position where the uppermost recording medium P is transported by the transport unit 12.

  The conveyance unit 12 is mounted on the sheet feeding tray 11 and a conveyance mechanism that conveys the recording medium P on the belt 123 by rotationally driving a ring-shaped belt 123 by a plurality of (for example, two) rollers 121 and 122. A supply unit for transferring the uppermost recording medium P to the belt 123 is provided. The transport unit 12 transports the recording medium P delivered to the belt 123 by the supply unit as the belt 123 rotates.

  The image forming unit 20 forms an image by ejecting ink onto the recording medium P. The image forming unit 20 includes an image forming drum 21, a delivery unit 22, a paper heating unit 23, a head unit 24, an irradiation unit 25, a delivery unit 26, and the like.

  The image forming drum 21 carries the recording medium P along a cylindrical outer peripheral surface, and conveys the recording medium P as it rotates. The conveyance surface of the image forming drum 21 faces the paper heating unit 23, the head unit 24, and the irradiation unit 25, and performs processing related to image formation on the conveyed recording medium P.

  The delivery unit 22 is provided at a position between the transport unit 12 of the paper feed unit 10 and the image forming drum 21, and delivers the recording medium P transported by the transport unit 12 to the image forming drum 21. The delivery unit 22 is a swing arm unit 221 that supports one end of the recording medium P conveyed by the conveyance unit 12, and a cylindrical delivery drum that delivers the recording medium P carried on the swing arm unit 221 to the image forming drum 21. The recording medium P on the transport unit 12 is picked up by the swing arm unit 221 and transferred to the transfer drum 222 to guide the recording medium P in the direction along the outer peripheral surface of the image forming drum 21 to form an image. Delivered to drum 21.

  The paper heating unit 23 heats the recording medium P carried on the image forming drum 21. The sheet heating unit 23 includes, for example, an infrared heater and generates heat in response to energization. The sheet heating unit 23 is provided in the vicinity of the outer peripheral surface of the image forming drum 21 and on the upstream side of the head unit 24 in the conveyance direction of the recording medium P by the rotation of the image forming drum 21. Heat generation of the sheet heating unit 23 is controlled by the control unit 40 so that the recording medium P carried by the image forming drum 21 and passing through the vicinity of the sheet heating unit 23 has a predetermined temperature.

The head unit 24 discharges ink to the recording medium P carried on the image forming drum 21 to form an image. The head unit 24 is provided for each color of C (cyan), M (magenta), Y (yellow), and K (black). In FIG. 1, head units 24 corresponding to the colors Y, M, C, and K are provided in order from the upstream with respect to the conveyance direction of the recording medium P that is conveyed along with the rotation of the image forming drum 21.
The head unit 24 of this embodiment is provided with a length (width) that covers the entire recording medium P in a direction (width direction) perpendicular to the conveyance direction of the recording medium P. That is, the ink jet recording apparatus 1 is a one-pass line head type ink jet recording apparatus. Each head unit 24 is provided with a plurality of recording heads 24a (see FIG. 2), and a recording medium is provided at a predetermined interval in the width direction as a whole on the surface facing the conveying surface of the plurality of recording heads 24a. Nozzle openings are arranged over an image formable width to P.

  The irradiation unit 25 irradiates energy rays for curing ink (here, ultraviolet curable ink) discharged from the head unit 24 onto the recording medium P. The irradiation unit 25 includes, for example, a fluorescent tube such as a low-pressure mercury lamp, and emits energy rays such as ultraviolet rays by causing the fluorescent tube to emit light. The irradiation unit 25 is provided in the vicinity of the outer peripheral surface of the image forming drum 21 and on the downstream side of the head unit 24 in the conveyance direction of the recording medium P by the rotation of the image forming drum 21.

  As a fluorescent tube emitting ultraviolet rays, in addition to a low-pressure mercury lamp, a mercury lamp having an operating pressure of about several hundred Pa to 1 MPa, a light source usable as a germicidal lamp, a cold cathode tube, an ultraviolet laser light source, a metal halide lamp, a light emitting diode, etc. Is mentioned. Among these, a light source (for example, a light emitting diode) that can irradiate ultraviolet rays with higher illuminance and consumes less power is more desirable. The energy rays are not limited to ultraviolet rays, but may be any energy rays having a property of curing the ink according to the properties of the ink, and the light source is replaced according to the wavelength of the energy rays.

  The delivery unit 26 conveys the recording medium P irradiated with energy rays from the irradiation unit 25 from the image forming drum 21 to the paper discharge unit 30. The delivery unit 26 rotates the annular belt 263 by a plurality of (for example, two) rollers 261 and 262 and conveys the recording medium P on the belt 263, and the recording medium P from the image forming drum 21. A cylindrical delivery drum 264 and the like are provided to the transport mechanism. The delivery unit 26 conveys the recording medium P transferred to the belt 263 by the transfer drum 264 by the belt 263 and sends it to the paper discharge unit 30.

  The paper discharge unit 30 stores the recording medium P sent out from the image forming unit 20 by the delivery unit 26. The paper discharge unit 30 includes a plate-shaped paper discharge tray 31 and the like, and the recording medium P after image formation is placed on the paper discharge tray 31.

The control unit 40 controls the operation of each unit of the inkjet recording apparatus 1 and controls the overall operation. The control unit 40 includes a CPU (Central Processing Unit) 401, a ROM (Read Only Memory) 402, a storage unit 403, and the like (see FIG. 4). The storage unit 403 may include a rewritable nonvolatile memory in addition to a volatile memory such as a DRAM or an SRAM. The nonvolatile memory stores setting data, log data, and the like that are not erased while the power is turned off.
In the control unit 40, the program read from the ROM 402 by the CPU 401 is executed on the RAM of the storage unit 403, and various control processes are executed.
As will be described later, the control unit 40 operates as an operation control unit 400a, a comparison value calculation unit 400b, and a determination unit 400c (FIG. 5), and performs operation control related to detection of ink leakage in the deaeration device 24c.

  The ink supply unit 50 stores ink and supplies the ink to the head unit 24 of the image forming unit 20. The ink supply unit 50 is provided for each color ink, and can discharge each color ink from a plurality of nozzle openings arranged in each recording head 24 a of the corresponding head unit 24.

  The ink used in the ink jet recording apparatus 1 of the present embodiment is not particularly limited, but here is an ultraviolet (UV) curable ink as described above, and in a state where UV is not irradiated, the ink depends on the temperature. It is an ink that changes phase between a gel state and a liquid (sol) state. For example, this ink has a predetermined temperature, for example, a phase change temperature of about 40 to 100 degrees, and is liquefied uniformly (solified) by being heated and raised above this phase change temperature. It gels below the predetermined temperature including about room temperature (0 degree to 30 degree). This ink is manufactured by various known methods. Alternatively, the ink may be kept in a liquid state over the entire use temperature.

  FIG. 2 is a diagram illustrating ink flow paths in the inkjet recording apparatus 1 of the present embodiment.

  In the inkjet recording apparatus 1 of the present embodiment, each color ink pumped out from the ink tank 51 of the ink supply unit 50 by the supply pump 52 corresponds to each recording head 24a of the corresponding head unit 24 via the ink flow path 24b. To be supplied. In addition, the ink jet recording apparatus 1 is configured to be able to return ink that has not been ejected by each recording head 24a to the ink flow path 24b.

  The ink flow path 24b is provided with a second sub tank 241, a deaeration module 242, a liquid feed pump 243, a check valve 244, a first sub tank 245, and the like. These are not particularly limited, but are connected in order with a hollow annular tube structure (liquid feeding tube). Ink that has not been ejected from the nozzle openings of the recording head 24a is returned to the second sub tank 241 from the outlet 240b via the recovery path 241b and the valve 241c. When it is necessary to remove ink from the recording head 24a during maintenance of the recording head 24a, the ink in the recording head 24a can be collected without being wasted by opening the valve 241c.

  The second sub tank 241 is one or a plurality of ink chambers for storing ink pumped from the ink tank 51 by the supply pump 52. The capacity of the second sub tank 241 is usually smaller than the ink tank 51. The ejected ink is heated in the ink heating unit 27 by the ink heater from the time it is stored in the second sub tank 241 until it is ejected by the recording head 24a, and is in a sol state or in a liquid with an appropriate viscosity. Maintained.

  The deaeration module 242 performs deaeration to remove the gas in the ink flowing from the second sub tank 241. The deaerated ink is sent to the first sub tank 245 through the check valve 244 by the liquid feed pump 243.

  The liquid feed pump 243 sends the ink deaerated by the deaeration module 242 to the first sub tank 245. A check valve 244 provided between the liquid feed pump 243 and the first sub tank 245 prevents the ink sent to the first sub tank 245 from flowing back.

  The first sub tank 245 is a small ink chamber in which the ink deaerated by the deaeration module 242 is temporarily stored. Although not particularly limited, the first sub tank 245 has substantially the same capacity as the second sub tank 241. is there. The first sub tank 245 is connected to the inlet 240a of each recording head 24a by a liquid feeding tube, and ink corresponding to the amount of ink ejected from the nozzle opening of each recording head 24a is supplied to the recording head 24a.

On the other hand, the deaeration module 242 is connected to the atmosphere communication unit 247, the chamber 248, and the vacuum suction unit 249. Between these, it connects with the vacuum tube 24c1, and the vacuum path | route from the deaeration module 242 to the vacuum suction part 249 is formed. When the vacuum suction unit 249 performs a suction operation, gas is removed from the ink in the deaeration module 242, and the removed gas (desorption gas) flows through this vacuum path. A detection unit 2461 is provided in a tube connecting the deaeration module 242 with the atmosphere communication unit 247 and the chamber 248. The vacuum suction unit 249 does not necessarily require the inside of the vacuum path to be in an ultra-high vacuum state, and performs decompression to the extent necessary for deaeration.
The deaeration module 24c includes the deaeration module 242, the detection unit 2461, the vacuum suction unit 249, the vacuum tube 24c1, and the control unit 40 (comparison value calculation unit 400b and determination unit 400c). Moreover, the leak detection part 246 is comprised by the detection part 2461 and the control part 40 as the comparison value calculation part 400b and the determination part 400c.

  The air communication unit 247 is a valve (atmospheric communication valve) whose atmospheric communication state is switched by an opening / closing operation, and is sucked by the vacuum suction unit 249 to be decompressed by being opened (opened) from the closed state. The inside (vacuum path) of a certain deaerator 24c is communicated with the outside (atmosphere). By using an electromagnetic valve or the like for the atmosphere communication unit 247, the opening / closing operation may not only be performed manually but also automatically controlled by the control unit 40.

  The chamber 248 separates the liquid from the gas when not only the gas is sucked from the degassing module 242 and flows into the vacuum path, and the liquid is sucked into the vacuum suction unit 249 so that the vacuum suction unit 249 It is a trap that plays a role of preventing a failure such as destruction of H.249. The chamber 248 has, for example, a small tank shape, and stores liquid at the bottom thereof. The chamber 248 is formed so that the stored liquid can be discharged by opening a discharge hole (not shown).

  The vacuum suction unit 249 sucks gas so that the inside of the vacuum path from the deaeration module 242 to the vacuum suction unit 249 is maintained within a predetermined negative pressure range lower than atmospheric pressure in the deaeration device 24c. It discharges outside the device 24c. A normal vacuum pump can be used for the vacuum suction unit 249, and the operation of the vacuum suction unit 249 is controlled by the control unit 40.

FIG. 3 is a view for explaining the internal structure of the cylindrical deaeration module 242 cut along a plane passing through the central axis.
The deaeration module 242 has a shape in which a gas permeable deaeration membrane 2426 made up of a number of hollow fiber membranes covers the periphery of the central tube 2424 inside the outer shell 2421. One end of the central tube 2424 is connected to the ink inlet 2422, and the other is sealed with a plug 2424a. An infinite number of fine holes 2424b (sewing holes) are provided on the outer wall of the central tube 2424, and the ink that has flowed into the central tube 2424 from the ink inlet 2422 flows out of the fine holes 2424b to the surroundings and is deaerated. The ink flows out of the film 2426 and flows out from the ink outlet 2423.

  The deaeration membrane 2426 has a number of hollow fine yarn structures with one end closed, and the membrane surface has gas permeability. The other end of the fine yarn structure of the degassing membrane 2426 is connected to the gas outlet 2425, and the inside of the fine yarn structure of the degassing membrane 2426 is decompressed by sucking the gas in the vacuum path by the vacuum suction unit 249. The In this state, when the ink contacts the membrane surface of the deaeration membrane 2426 (the outer surface of the fine hollow fiber structure), only the gas in the ink selectively permeates the membrane surface and the ink is deaerated. That is, by providing a large number of fine degassing films 2426, the contact area between the ink and the film surface is widened, and degassing is performed efficiently.

  The deaeration film 2426 may leak a slight amount of the liquid component (mainly monomer) of the ink to the vacuum path side where the pressure is reduced by the vacuum suction unit 249 together with the gas component. Further, when the deaeration film 2426 deteriorates and the amount of ink leaked increases, and further, when the deaeration film 2426 is broken, the ink flows out to the vacuum path side at once.

  The detection unit 2461 measures the liquid flowing through the vacuum tube 24 c 1 from the deaeration module 242 to the chamber 248. The detector 2461 is provided on the side of the degassing module 242 with respect to the chamber 248 in the vacuum path, in particular, the vacuum tube 24c1 closest to the degassing module 242, and the gas removed from the ink by the degassing module 242. When ink (liquid) is mixed with the sensor, a sensor capable of directly or indirectly detecting the passage of the ink is provided. Further, the position where the detection unit 2461 is provided in the vacuum tube 24c1 is a position that differs in the vertical direction with respect to the deaeration module 242 (deaeration film 2426) (that is, the position coordinate about the vertical axis differs in the positive direction). The vacuum tube 24c1 from the deaeration module 242 to the position where the detection unit 2461 is provided extends with a drop in the vertical direction (the position is the position where the deaeration module 242 is higher). It is not necessary to be arranged along the vertical direction). Thereby, even when the intake is not performed, the ink and each component passing through the position of the detection unit 2461 are easily moved in the direction of gravity.

FIG. 4 is a diagram illustrating a configuration related to measurement by the detection unit 2461.
Here, arrangement | positioning with respect to the cross section of the vacuum tube 24c1 connected from the deaeration module 242 to the air | atmosphere communication part 247 is shown typically.

  The detection unit 2461 includes a light emitting unit 2461a and a light receiving unit 2461b, which are connected in series with appropriate resistance elements 2466 and 2467 between the applied voltage Vcc and the ground unit 2465, respectively, and sandwich the vacuum tube 24c1. It is provided at an opposing position. An amplifier 2463 and an A / D converter (analog / digital converter) 2464 are sequentially connected to the detector 2461 (light receiver 2461b), and a measurement value is output to the controller 40.

  The light emitting unit 2461a is, for example, an LED (Light Emitting Diode), and emits light having a predetermined wavelength with an intensity corresponding to the magnitude of the current by applying an operating voltage to flow a current. The wavelength band is not particularly limited, and can be, for example, a wavelength in the infrared region. Infrared light has little influence (disturbance) from an external source, so that ink in the vacuum tube can be detected easily and accurately. Alternatively, in the case where visible light is used, each of the deaeration devices 24c provided for each color ink flow path 24b takes into consideration the light absorption rate and scattering rate according to the ink color and components. Ink may be measured using light of a wavelength.

The light receiving unit 2461b is, for example, a phototransistor, and receives light emitted from the light emitting unit 2461a and outputs a current corresponding to the amount of received light. The light receiving unit 2461b is preferably highly sensitive to the light of the light emitting unit 2461a and low sensitive to light in other wavelength bands.
At this time, the vacuum tube 24c1 is formed of a material transparent to the wavelength band of light emitted from the light emitting unit 2461a at least between the light emitting surface of the light emitting unit 2461a and the light receiving surface of the light receiving unit 2461b. Accordingly, the amount of light emitted from the light emitting unit 2461a is made constant, so that the amount of light received (measured value) by the light receiving unit 2461b is a component that passes through the measurement location (predetermined location) of the vacuum tube 24c1, here mainly ink. It decreases (changes) due to absorption and scattering according to the amount of component (detected amount).
Alternatively, the light emitting unit 2461a and the light receiving unit 2461b (or the entire detecting unit 2461) are integrally formed with a connector that connects the two vacuum tubes 24c1, and light emitted from the light emitting unit 2461a is a vacuum path inside the connector. The light-receiving surface of the light-receiving unit 2461b may be transmitted, and the light-emitting surface of the light-emitting unit 2461a and the light-receiving surface of the light-receiving unit 2461b may be embedded in the vacuum tube 24c1.

The amplifier 2463 amplifies the divided voltage of the applied voltage Vcc output according to the current output according to the amount of received light in the light receiving unit 2461b.
The A / D conversion unit 2464 converts the amplified voltage into a digital value at a predetermined sampling frequency and outputs the digital value to the control unit 40.

  FIG. 5 is a block diagram showing a functional configuration of the inkjet recording apparatus 1.

  The inkjet recording apparatus 1 includes a transport driving unit 41, a head driving unit 42, a communication unit 43, an operation display unit 441, a notification output unit 442, a paper heating unit 23, and an irradiation unit with respect to the control unit 40. 25, the ink heater drive unit 27a, the supply pump 52, the second float sensor 241a, the first float sensor 245a, the liquid feed pump 243, the detection unit 2461, the communication unit drive unit 247a, and the vacuum suction unit. 249 and the like are connected via a bus 49.

  The transport driving unit 41 operates each unit for transporting the recording medium P. That is, the conveyance drive unit 41 includes a rotation motor of the image forming drum 21 and at least a part of the rotation drive unit of the rollers 121, 122, 261, 262, and the like, and transfers the recording medium P from the paper supply unit 10 to the image forming unit 20. Then, the paper is moved to the paper discharge unit 30 at a set speed. The conveyance speed can be made variable depending on the image forming mode. Further, there may be a portion where the conveyance speed is different between the paper feeding unit 10 and the paper discharging unit 30.

  The head driving unit 42 ejects ink from a plurality of nozzle openings provided in the recording head 24 a of each head unit 24. For example, the head drive unit 42 applies a predetermined voltage waveform to a pressure application mechanism (such as a piezoelectric element) provided along an ink flow path that communicates with the nozzle opening inside the recording head 24a. Is deformed to apply pressure to the ink in the ink flow path, and the ink is ejected from the nozzle opening of the ink ejection target.

  The communication unit 43 is for performing communication between the inkjet recording apparatus 1 and an external device, and includes a NIC (Network Interface Card) or the like. The communication unit 43 receives, for example, image data to be imaged from an external device and print job data related to the print setting of the image data, or the image forming result and the ink jet recording apparatus 1 When status information such as abnormality is transmitted, processing related to transmission / reception of the data is performed.

  The operation display unit 441 is used when a user directly inputs settings relating to the operation of the inkjet recording apparatus 1 or displays the above-described status information. The operation display unit 441 performs various displays on the display screen in response to a control signal from the control unit 40 as the display unit 441b, and a touch sensor provided on the display screen as the operation detection unit 441a. The user's touch operation, its type and position are acquired and output to the control unit 40 as an operation signal.

The notification output unit 442 is for performing a predetermined notification operation, and includes, for example, an audio output unit that generates a buzzer sound and a beep sound, an LED lamp that can turn on and blink light of a predetermined wavelength, and the like. Prepare.
The notification unit 440 is configured by the display unit 441b and the notification output unit 442 described above.

  The ink heater driving unit 27 a operates the ink heater in accordance with a control signal from the control unit 40 and causes the ink heating unit 27 to heat the ink. The ink heating unit 27 is provided with one or a plurality of temperature sensors, and the control unit 40 causes the ink heater driving unit 27a to switch on / off the ink heater according to the temperature of the ink measured by the temperature sensor. Keep the ink at the proper temperature.

  The second float sensor 241a and the first float sensor 245a measure ink amounts inside the second sub tank 241 and the first sub tank 245, respectively. The control unit 40 operates the supply pump 52 and the liquid feed pump 243 intermittently so that the ink amounts inside the second sub tank 241 and the first sub tank 245 are within the set range.

  The communication unit driving unit 247a opens and closes the atmosphere communication unit 247 according to a control signal from the control unit 40. For example, when the atmosphere communication unit 247 is an electromagnetic valve, the communication unit driving unit 247a supplies electric power for operating the electromagnetic valve.

  Next, the operation of the deaerator 24c and the detection of ink leakage to the deaerator 24c will be described.

  The deaeration device 24c is continuously evacuated by the vacuum suction unit 249 during a period during which the ink is ejected from the recording head 24a, a preparation period thereof, and a predetermined waiting time during or after the ink ejection operation. The operation related to deaeration is performed by operating. Further, in the deaeration device 24c, the ink leakage detection operation is performed over the operation period of the vacuum suction unit 249 and the time until the decompressed state in the vacuum path is canceled after the operation ends. Alternatively, even during the stop period of the vacuum suction unit 249, ink leakage does not occur during the period when the power of the inkjet recording apparatus 1 is turned on, except when operating in a special operation mode related to abnormality or maintenance. The detection operation may be continued.

In the inkjet recording apparatus 1 of the present embodiment, the light receiving amount measurement of the light receiving unit 2461b in the detecting unit 2461 is continuously performed, the change in the received light amount is acquired, and an abnormal change in the received light amount is detected. Determine ink leakage in real time without delay.
The measurement value may be raw data acquired at a sampling frequency equal to the acquisition frequency of the measurement value according to the A / D conversion unit 2464 as long as the measurement value is acquired in real time with almost no delay. A value obtained at a frequency higher than the frequency may be averaged, a median value may be used, or a remaining value excluding the maximum / minimum value may be averaged.

  FIG. 6 is a graph illustrating an example of a temporal change in the amount of received light measured by the light receiving unit 2461b of the inkjet recording apparatus 1 of the present embodiment.

  As described above, the amount of light received by the light receiving unit 2461b indicates the intensity of light transmitted from the light emitting unit 2461a through the vacuum tube 24c1, and the light transmission location (predetermined) by mixing ink (liquid). The amount of received light (the amount of transmitted light) at the point) decreases. The transparency of the vacuum tube 24c1 decreases due to aging, the monomer adheres and becomes dirty due to long-term use, and the amount of transmitted light gradually decreases due to a decrease in the light emission efficiency of the LED of the light emitting unit 2461a ( Line m in FIG. That is, the transmitted light amount (measured value) is a value (measured value) corresponding to the state of the vacuum tube 24c1 including the ink transmissive state, and decreases according to the secular change even when the ink is not transmitted. Further, although the deaeration membrane 2426 is not broken, the amount of transmitted light may decrease due to the permeation of the monomer (infiltrate) (timing a and b in FIG. 6). In addition, since the amount of the gas is small, and it moves while being pulled toward the chamber 248 along the vacuum path, the fluctuation does not continue and the fluctuation is small.

  In order to eliminate these influences and detect only a sudden decrease in transmitted light amount (timing c in FIG. 6) corresponding to ink leakage due to breakage of the degassing membrane 2426, the ink jet recording apparatus 1 of the present embodiment. Compare the measured recent transmitted light quantity (measured value) with the comparative light quantity (compared value) calculated based on the past measurement history of the transmitted light quantity. (Difference) or more, that is, if the value obtained by subtracting the measured value from the comparison value (difference) is greater than or equal to the reference value, it is determined that ink leakage has occurred. As the comparison value, a value that changes in accordance with the change in the offset value due to the above-mentioned secular change is used. For example, the average value of the most recent measurement values (that is, the upper limit time) is weighted such that the older data is lighter. (For example, the line p in FIG. 6) or the current transmitted light amount estimated based on the tendency of long-term change (such as a regression line) obtained from the past measurement values can be used. Further, the reference value is preferably a value that can exclude a decrease in the measured value related to the above-mentioned temporary permeation solution, and this reference value may be a fixed value (for example, the line t in FIG. A value determined by a ratio (predetermined ratio) to the comparison light quantity may be used. Alternatively, the reference value may be determined based on the dispersion or standard deviation (for example, 3 times or 6 times the standard deviation) by counting the dispersion (dispersion) of past measurement values.

  Since the comparison value and the change in the reference value based on the influence of such a long-term change are sufficiently slow compared with the measurement frequency (for example, every 100 msec), the frequency is low compared with the measurement frequency (for example, once an hour). Etc.) and updated.

FIG. 7 is a flowchart showing a control procedure by the control unit 40 of the ink leakage detection process executed in the inkjet recording apparatus 1 of the present embodiment.
Here, the ink leakage detection process is started when the main power supply of the inkjet recording apparatus 1 is turned on.

  When the ink leakage detection process is started, the control unit 40 (CPU 401) causes the light emitting unit 2461a of the detecting unit 2461 to emit light and obtains a measurement value relating to the amount of light transmitted by the light receiving unit 2461b (step S101). The light emission operation of the light emitting unit 2461a can be continuously performed while the ink leakage detection process is continued thereafter. The control unit 40 stores the acquired measurement value in the storage unit 403 for a predetermined period. At this time, the measurement value may be explicitly stored in association with the acquisition timing, or an upper limit time to be stored may be determined by storing a predetermined number of measurement values acquired at equal time intervals.

  Next, the control unit 40 as the determination unit 400c compares the reference value with a value obtained by subtracting the measured value from the comparison value calculated in advance, and determines whether or not it is equal to or less than the reference value (step). S102). The comparison value is a value calculated in step S104, which will be described later. In the case immediately after the start of the ink leak detection process, the value detected last in the previous ink leak detection process is used. In the case of the first ink leakage detection process or immediately after the deaeration module 242 is replaced, the first measured value can be set as a comparison value as it is. Usually, the comparison value calculated most recently in the previous loop in the loop processing of steps S101 to S104 is used.

  When it is determined that the value obtained by subtracting the measured value from the comparison value is equal to or less than the reference value (“YES” in step S102), that is, when the liquid component that absorbs incident light in the vacuum tube 24c1 has not increased significantly. In step S103, the control unit 40 determines whether a predetermined time has elapsed since the comparison value used this time was updated. When it is determined that the predetermined time has not elapsed (“NO” in step S103), the process of the control unit 40 returns to step S101. When it is determined that the predetermined time has elapsed (“YES” in step S103), the control unit 40 as the comparison value calculation unit 400b calculates a new comparison value (step S104), and then performs the processing step. Return to S101. Note that the process in step S101 is performed at predetermined intervals (for example, at an interval of 100 msec), and a waiting time may be provided between the time when the process shifts to step S101 and the actual start. .

If it is determined that the value obtained by subtracting the measured value from the comparison value is not equal to or less than the reference value (“NO” in step S102), it means that an abnormal increase in ink leakage has occurred in the vacuum tube 24c1. The control unit 40 serving as the operation control unit 400a stops image formation (step S105) and performs a predetermined operation for notifying abnormality related to ink leakage (step S106). For example, the control unit 40 causes the display screen of the operation display unit 441 to display an abnormality as a predetermined operation. Alternatively, when the notification output unit 442 includes an audio output unit, the control unit 40 may output a beep sound or the like, and when the notification output unit 442 includes an LED lamp or the like. The LED lamp may be turned on or blinked.
At this time, the control unit 40 serving as the operation control unit 400a provides the image forming unit 20 with one unit (one recording medium or one of repeated image formations) in which image formation of an image to be formed has already started. For example, the image forming process is stopped.
Then, the control unit 40 ends the ink leakage detection process.

As described above, the deaeration device 24c included in the inkjet recording apparatus 1 of the present embodiment is provided in the middle of the ink flow path 24b, and the hollow fiber membrane-shaped deaeration whose outer surface is in contact with the ink in the ink flow path 24b. A desorbed gas that connects the membrane 2426, the vacuum suction unit 249, the inner surface of the hollow fiber membrane and the vacuum suction unit 249, desorbs from the ink in accordance with the suction operation of the vacuum suction unit 249, and permeates the degassing film 2426. , A leakage detection unit 246 that detects ink leakage into the vacuum path, and a leakage detection unit 246 that detects ink leakage based on the measured value. The leak detection unit 246 includes a detection unit 2461 that acquires a measurement value according to the state in the vacuum path, and the control unit 40. The control unit 40 uses a past comparison value for comparison with the latest measurement value. It operates as a comparison value calculation unit 400b that calculates based on a history of measurement values, and a determination unit 400c that determines the presence or absence of ink leakage from the deaeration film 2426 based on a comparison result between the latest measurement value and the comparison value. To do.
That is, the ink transmission state in the vacuum path can be acquired almost in real time, and it is easy to exclude temporary small-scale fluctuations by comparing with the comparison value. Since ink leakage can be determined by excluding the influence, ink leakage due to breakage of the deaeration film 2426 can be detected more quickly.

  In addition, since the presence or absence of ink leakage is determined based on whether or not the difference between the latest measured value and the comparison value is equal to or greater than a predetermined reference value, it is true that small-scale and short-time passage due to monomer passage is excluded. Therefore, it is possible to appropriately and quickly detect ink leakage having a problem.

  Further, since this reference value is set to a predetermined ratio with respect to the comparison value, it is possible to set a reference value according to a decrease in sensitivity due to deterioration of the vacuum tube or the like.

  Further, the storage unit 403 includes an A / D conversion unit 2464 that digitally converts a measurement value at a predetermined sampling frequency, and a storage unit 403 that stores at least a predetermined number of digitally converted measurement values. Since the comparison value is calculated by averaging the measured values obtained by a predetermined weighting, ink leakage can be detected quickly and accurately based on appropriate comparison values corresponding to changes over time such as the vacuum tube 24c1 and the degassing membrane 2426. I can do it.

  In addition, since weighted averaging is performed with a weight that becomes lighter according to the increase in elapsed time from the time when the measured value is calculated to the time when the comparative value is calculated, ink leakage is appropriately detected based on the comparative value closer to the most recent measured value. I can do it.

  In addition, among the measurement values acquired in the past, the comparison value is calculated using the elapsed time from the measurement value acquisition time to the comparison value calculation time, which is less than the predetermined upper limit time. In addition, it is possible to detect ink leakage with an appropriate amount of change in transmitted light amount based on a comparison value closer to the most recent measurement value, and it is possible to delete the history of measurement values that have become obsolete. There is no need to increase the capacity.

  The detection unit 2461 includes a light emitting unit 2461a that makes light of a predetermined wavelength incident on the vacuum path, a light receiving unit 2461b that receives the transmitted light after the incident light has transmitted at least part of the vacuum path, Therefore, ink can be detected more accurately by making light of an appropriate wavelength incident on the vacuum path with stable and optimum intensity.

  In addition, since the light emitting unit 2461a makes infrared light incident as light having a predetermined wavelength, it is possible to detect ink that is highly resistant to disturbance and stable.

  A chamber 248 for separating the desorbed gas and ink (liquid) is provided in the middle of the vacuum path, and the detection unit 2461 is incident in the vacuum path closer to the degassing module 242 than the chamber 248. Since the state in the vacuum path is detected by transmitting light, it is possible to prevent the leaked ink from being caught in the chamber 248 and delayed in detection.

  The ink jet recording apparatus 1 of the present embodiment includes a deaeration device 24c and a recording head 24a that is provided on the downstream side of the ink flow path 24b and discharges ink. Therefore, the ink jet recording apparatus 1 can promptly detect ink leakage in the deaeration device 24c and take appropriate measures.

  The control unit 40 as the operation control unit 400a controls the ink ejection operation in the recording head 24a, and stops the operation of the recording head 24a when ink leakage is detected. That is, it is possible to prevent generation of useless recording media and ink by quickly stopping the image formation before the deterioration of the image caused by the ink leakage detected promptly occurs.

  Further, the control unit 40 as the operation control unit 400a stops the operation of the recording head 24a after the completion of ink ejection related to the formation of the formation target image formed by the recording head 24a at the timing when the ink leakage is detected. Therefore, by effectively using the ink that has already been deaerated on the downstream side from the deaerator 24c, an image in the middle of formation is completed, so that a new image with reduced image quality is not formed, and the image is being formed. Recording media and ejected ink are not wasted.

  The control unit 40 as the operation control unit 400a includes a notification unit 440. When the operation of the recording head 24a is stopped, the control unit 40 causes the notification unit 440 to perform a predetermined notification operation on the display screen of the operation display unit 441. Make a display. Accordingly, it is possible to prompt the user of the inkjet recording apparatus 1 to quickly know the cause of the stop and take a quick response.

[Modification]
Next, a modified example of the ink jet recording apparatus 1 will be described.
FIG. 8 is a diagram illustrating a modification of the configuration related to measurement by the detection unit 2461. FIG. 9 is a block diagram showing a functional configuration of the ink jet recording apparatus 1a of the present modification.
In the inkjet recording apparatus 1a of this modification, the control unit 40a does not function as the comparison value calculation unit 400b and the determination unit 400c, while the leakage detection unit 246a performs the operation based on analog data together with the detection unit 2461. A value calculation unit 2468 and a determination unit 2469 are provided. Other configurations are the same, and the same portions are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 8, in the leakage detection unit 246a, the analog data of the measurement value in the detection unit 2461 is branched into two after being amplified by the amplifier 2463, and one is input to the determination unit 2469 as it is. On the other hand, first, a high frequency component including a frequency band of an abrupt signal change related to ink leakage is removed by being input to an LPF (low-pass filter) 2468a, and further, a reference voltage Vref is added by an adder 2468b. Here, the reference voltage Vref is a negative value. The LPF 2468a has a capacitor and a coil as in a normal analog circuit, and outputs a value corresponding to an average value of values measured within a predetermined time period up to now. Therefore, the determination unit 2469 outputs a signal according to whether or not the current measurement value is lower than the reference value by comparison with the average value for a predetermined time. As the determination unit 2469, for example, a comparator is used.
That is, in this modified example, the LPF 2468a and the addition unit 2468b that adds the reference voltage Vref constitute the comparison value calculation unit 2468.

  As a result, when the control unit 40a serving as the operation control unit 400a receives a signal indicating a sudden decrease in the current measurement value from the determination unit 2469, the control unit 40a cancels image formation and determines that there is a rapid increase in ink leakage. What is necessary is just to perform the process which concerns on alerting | reporting.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, in the above embodiment, the detection unit 2461 uses a sensor that transmits light (infrared light) through a vacuum tube so that the transmitted light is reduced according to the passage of the ink component. Not limited to. For example, a sensor that measures the reflected light of the incident light by the ink may be used, or the ink component may have passed through the measurement location, such as a sensor that measures a magnetic field that changes according to the passage of the ink's specific property. Any sensor that can detect without delay is acceptable.

  Further, the method of determining the comparison value is not limited to that shown in the above embodiment. For example, a new comparison value may be calculated using the previous comparison value and the measured value acquired thereafter. In the above embodiment, the comparison value is calculated in parallel with the normal measurement during the operation of the deaeration device 24c. However, the comparison value is not before the start of the operation of the deaeration device 24c such as when the ink jet recording apparatus is started. It may be required during operation. In this case, since it is not normally predicted that ink passes through the vacuum tube, a comparison value may be calculated and used based on a single measurement value during each non-operation.

  Further, in the above embodiment, the processing related to the ink leakage detection of the deaeration device 24c as the operation control unit 400a, the comparison value calculation unit 400b, and the determination unit 400c is performed using the control unit 40 of the inkjet recording apparatus 1. Alternatively, the deaeration device 24c may include a separate control unit, and output only commands related to abnormal display or image formation stop to the control unit 40. Alternatively, the control unit 40c may perform operations as the comparison value calculation unit 400b and the determination unit 400c, and the control unit 40 may perform operations as the operation control unit 400a.

  In the above embodiment, the configuration including the chamber 248 has been described. However, in the case where a configuration in which ink (liquid) does not flow into the vacuum suction unit 249 is separately provided, deaeration without the chamber 248 is provided. The device 24c may be used. The chamber 248 is not limited to being used as a trap, and a space used for various purposes may be provided in the middle of the vacuum tube 24c1.

  Further, in the deaeration device 24c used in the ink jet recording apparatus 1 of the above embodiment, the air communication unit 247 may not be provided.

  In the above embodiment, the deaeration device using the hollow fiber membrane as the deaeration membrane 2426 has been described as an example, but a deaeration device using a gas permeable membrane of another shape may be used.

In the above embodiment, when ink leakage is detected, ink discharge is continued until the formation target image being formed is formed. However, the ink discharge may be stopped immediately, or the formation target image may be stopped. The determination may be made in accordance with the remaining amount. Further, the image to be formed is not limited to one sheet of cut paper, but may be one unit of an image repeatedly formed in the cut sheet, or conversely, a set of a plurality of sheets. good. In addition, when an image is formed on continuous paper or continuous cloth, the ink ejection may be appropriately terminated at the separation of the image.
In addition, specific details such as the configuration, arrangement, and operation procedure shown in the above embodiment can be changed as appropriate without departing from the spirit of the present invention.

  The present invention can be used for a deaeration device and an ink jet recording apparatus.

DESCRIPTION OF SYMBOLS 1 Inkjet recording device 1a Inkjet recording device 10 Paper feed part 11 Paper feed tray 12 Transport part 121, 122 Roller 123 belt 20 Image formation part 21 Image formation drum 22 Delivery unit 221 Swing arm part 222 Delivery drum 23 Paper heating part 24 Head unit 24a recording head 240a inlet 240b outlet 24b ink flow path 241a second float sensor 241 second sub tank 241b recovery path 241c valve 242 degassing module 2421 outer shell 2422 ink inlet 2423 ink outlet 2424 central tube 2424a plug 2424b narrow hole 2425 gas Outflow port 2426 Degassing membrane 243 Liquid feed pump 244 Check valve 245 First sub tank 245a First float sensor 24c Deaeration device 246 Leak detection unit 246a Leak detection Part 2461 detecting unit 2461a-emitting portion 2461b light receiving portion 2463 amplifiers 2464A / D conversion unit 2465 grounding portion 2466,2467 resistive element 2468 comparison value calculator 2468aLPF
2468b addition unit 2469 determination unit 247 atmospheric communication unit 247a communication unit driving unit 248 chamber 249 vacuum suction unit 24c1 vacuum tube 25 irradiation unit 26 delivery unit 261, 262 roller 263 belt 264 delivery drum 27 ink heating unit 27a ink heater driving unit 30 Paper unit 31 Paper discharge tray 40 Control unit 40a Control unit 400a Operation control unit 400b Comparison value calculation unit 400c Determination unit 401 CPU
402 ROM
403 storage unit 41 transport drive unit 42 head drive unit 43 communication unit 440 notification unit 441 operation display unit 441a operation detection unit 441b display unit 442 notification output unit 49 bus 50 ink supply unit 51 ink tank 52 supply pump P recording medium Vcc applied voltage Vref reference voltage

Claims (13)

A gas-permeable degassing membrane that is provided in the middle of the ink flow path and has one surface in contact with the ink in the ink flow path;
A vacuum suction section;
Desorption that connects the surface opposite to the one surface of the degassing membrane and the vacuum suction portion and desorbs from the ink in accordance with the suction operation of the vacuum suction portion and permeates the degassing membrane A vacuum path through which gas flows;
A leakage detector for detecting ink leakage into the vacuum path;
With
The leakage detector is
A detection unit that detects a state in the vacuum path and acquires a measurement value according to the state;
A comparison value calculation unit that calculates a comparison value for comparison with the latest measurement value based on a history of past measurement values;
A determination unit that determines the presence or absence of ink leakage from the deaeration film based on a comparison result between the latest measurement value and the comparison value;
A deaeration device comprising: The deaeration apparatus according to claim 1, wherein the determination unit determines whether or not the ink has leaked based on whether or not a difference between the latest measurement value and the comparison value is equal to or greater than a predetermined reference difference. .   The deaeration apparatus according to claim 2, wherein the reference difference is determined to be a predetermined ratio with respect to the comparison value. An A / D converter that digitally converts the measurement value at a predetermined sampling frequency;
A storage unit that stores at least the most recent predetermined number of the digitally converted measurement values;
With
The deaeration apparatus according to claim 2 or 3, wherein the comparison value calculation unit calculates the comparison value by performing a predetermined weighted average of the measurement values stored in the storage unit.   The said comparison value calculation part performs the said predetermined weighted average by the weight which becomes light according to the increase in the elapsed time from the time of income of the said measurement value to the time of the calculation of the said comparison value. Deaeration device.   The comparison value calculation unit calculates the comparison value by using, among the measurement values, an elapsed time from acquisition of the measurement value to calculation of the comparison value that is equal to or less than a predetermined upper limit time. The deaerator according to claim 4 or 5.   The detection unit includes: a light emitting unit that causes light of a predetermined wavelength to enter the vacuum path; and a light receiving unit that receives the transmitted light after the incident light has transmitted at least part of the vacuum path. The deaeration device according to claim 1, wherein the deaeration device is a deaeration device.   The deaeration apparatus according to claim 7, wherein the light emitting unit makes infrared light incident as the light having the predetermined wavelength. A chamber for separating the desorbed gas and liquid is provided in the middle of the vacuum path,
The deaeration apparatus according to claim 1, wherein the detection unit detects a state in the vacuum path closer to the deaeration film than the chamber. A deaeration device according to any one of claims 1 to 9,
A recording head provided on the downstream side of the ink flow path for discharging ink;
An ink jet recording apparatus comprising:   11. The ink jet apparatus according to claim 10, further comprising an operation control unit that controls an ink discharge operation in the recording head and stops the operation of the recording head when the leakage detection unit detects the ink leakage. Recording device. The operation control unit stops the operation of the recording head after completion of ink ejection related to formation of a formation target image formed by the recording head at a timing when the ink leakage is detected. Item 12. The ink jet recording apparatus according to Item 11. A notification unit for performing a predetermined notification operation;
The inkjet recording apparatus according to claim 11 or 12, wherein the operation control unit causes the notification unit to perform the predetermined notification operation when the operation of the recording head is stopped.

Images