JPWO2015125521A1 - Inkjet recording device - Google Patents

Abstract

The deaeration module 242 has a hollow fiber membrane provided in an ink flow path 24b for supplying ink heated to a predetermined temperature from the ink tank 51 to the recording head 24a and capable of transmitting dissolved gas in the ink. The vacuum pump 249 reduces the atmospheric pressure in the deaeration module 242. The vacuum path 250 allows the dissolved gas removed by the degassing module 242 to flow down. The temperature detector 253 detects the temperature in the vacuum path 250. The control unit detects a temperature rise abnormality in the vacuum path 250 based on the detection result by the temperature detection unit 253.

Description

  The present invention relates to an ink jet recording apparatus.

  In an ink jet recording apparatus that forms an image on a recording medium by ejecting ink from the nozzles of an ink jet head using an electromechanical conversion action by a piezoelectric element, gas dissolved in the ink becomes bubbles and remains in the ink. If this occurs, problems such as non-ejection of ink from the nozzles may occur.

  For this reason, a conventional ink jet recording apparatus is known that includes a deaeration module on an ink supply path for supplying ink from an ink tank to an ink jet head. This deaeration module has a gas permeable membrane such as a hollow fiber membrane inside, and when the ink flows down to one side through the gas permeable membrane and the pressure on the opposite side is reduced by a vacuum pump, the gas permeable membrane The dissolved gas in the ink passing through the interface is removed by permeating through the gas permeable membrane.

  However, the gas permeable membrane is formed thin, and there may be a problem that the gas permeable membrane is damaged due to the pressure difference at the membrane interface in the use state. In this case, since a large amount of ink suddenly flows to the vacuum pump side due to the damage of the gas permeable membrane, there is a possibility that the vacuum pump may be malfunctioned. Therefore, the breakage of the gas permeable membrane is detected and the driving of the vacuum pump is stopped. There is a need.

  In view of such a situation, in the conventional ink jet recording apparatus, the vacuum path in the vacuum path connecting the deaeration module and the vacuum pump is in a predetermined reduced pressure state by driving the vacuum pump, and the vacuum pump is stopped. By providing the detection means to detect that the pressure has risen from the predetermined reduced pressure state by the dissolved gas removed by the gas permeable membrane, measure the time until the pressure rise is detected from the reduced pressure state by the detection means However, there is one in which an abnormality of the deaeration module is detected based on the measurement result (for example, Patent Document 1).

JP 2010-58413 A

  However, the technique described in Patent Document 1 cannot start measurement unless the vacuum pump is stopped, and also requires a measurement time for detecting an abnormality of the deaeration module. Therefore, when the gas permeable membrane is largely damaged and the amount of ink leakage is large, this cannot be detected promptly, so there is still a possibility that the ink will flow into the vacuum pump.

  The subject of this invention is providing the inkjet recording device which can detect the abnormality of a deaeration module rapidly.

In order to solve the above problems, the invention according to claim 1 is provided on an ink supply path for supplying ink heated to a predetermined temperature from an ink tank to an inkjet head, and is capable of transmitting dissolved gas in the ink. A degassing module having a gas permeable membrane therein, and a vacuum pump for reducing the pressure inside the degassing module, the pressure inside the degassing module being reduced by the vacuum pump via the gas permeable membrane. In the inkjet recording apparatus for removing dissolved gas in the heated ink
A vacuum path through which the dissolved gas removed by the degassing module flows down;
A temperature detector for detecting the temperature in the vacuum path;
A control unit for detecting an abnormal temperature rise in the vacuum path based on a detection result by the temperature detection unit;
It is provided with.

According to a second aspect of the present invention, in the ink jet recording apparatus according to the first aspect,
The control unit performs control to stop driving of the vacuum pump when detecting an abnormal temperature rise in the vacuum path.

The invention according to claim 3 is the ink jet recording apparatus according to claim 1 or 2,
An image forming unit that discharges ink from the inkjet head to form an image on a recording medium;
The control unit performs control to stop an image forming operation by the image forming unit when detecting an abnormal temperature rise in the vacuum path.

According to a fourth aspect of the present invention, in the ink jet recording apparatus according to the first aspect,
An image forming unit that discharges ink from the inkjet head to form an image on a recording medium;
The controller stops driving the vacuum pump when the temperature rise in the vacuum path is larger than the first change amount, and when the image forming unit is executing image formation, When the control for interrupting the image formation in progress is performed, and the temperature rise in the vacuum path is larger than the second change amount smaller than the first change amount and not more than the first change amount. In addition, the control of stopping the vacuum pump drive and stopping the image forming operation by the image forming unit after the image forming in progress is completed when the image forming unit is executing the image forming. It is characterized by performing.

The invention according to claim 5 is the ink jet recording apparatus according to any one of claims 1 to 4,
When the control unit detects an abnormal temperature rise in the vacuum path, the control unit is provided with a notification unit that notifies that fact.

The invention according to claim 6 is the inkjet recording apparatus according to any one of claims 1 to 5,
The vacuum path connects the degassing module and the vacuum pump.

The invention according to claim 7 is the inkjet recording apparatus according to any one of claims 1 to 6,
The controller determines a detection result by the temperature detector every predetermined time, and detects an abnormality of the temperature increase in the vacuum path on condition that a predetermined amount of temperature increase is determined continuously for a predetermined number of times. It is characterized by.

According to an eighth aspect of the present invention, there is provided a deaeration module provided on an ink supply path for supplying ink from an ink tank to an ink jet head and having a gas permeable membrane capable of transmitting dissolved gas in the ink therein, An ink jet recording apparatus comprising: a vacuum pump for reducing the pressure in the air module; and removing the dissolved gas in the ink through the gas permeable film by reducing the pressure in the degassing module with the vacuum pump;
Connecting the degassing module and the vacuum pump, and a vacuum path through which the dissolved gas removed by the degassing module flows down,
An ink trap provided on the vacuum path and storing ink leaked from the gas permeable membrane;
A liquid amount detector for detecting the amount of ink in the ink trap;
A control unit for detecting an abnormality of the deaeration module based on a detection result by the liquid amount detection unit;
It is provided with.

The invention according to claim 9 is the ink jet recording apparatus according to claim 8,
The control unit performs control to stop driving of the vacuum pump when an abnormality of the deaeration module is detected.

The invention according to claim 10 is the ink jet recording apparatus according to claim 8 or 9, wherein
An image forming unit that discharges ink from the inkjet head to form an image on a recording medium;
The control unit performs control to stop an image forming operation by the image forming unit when an abnormality of the deaeration module is detected.

The invention according to claim 11 is the ink jet recording apparatus according to claim 8,
An image forming unit that discharges ink from the inkjet head to form an image on a recording medium;
The control unit stops driving the vacuum pump and is executing image formation by the image forming unit when the increase amount of the ink liquid amount in the ink trap is larger than the first increase amount. In this case, control is performed to interrupt the image formation that is being performed, and the amount of increase in the amount of ink in the ink trap is greater than the second increase that is smaller than the first increase, and the first The driving of the vacuum pump is stopped when the increase amount is equal to or less than 1, and when the image formation by the image forming unit is being executed, the image by the image forming unit is completed after the image forming is being executed. Control is performed to stop the forming operation.

Invention of Claim 12 in the inkjet recording device as described in any one of Claims 8-11 WHEREIN:
When the abnormality of the deaeration module is detected by the control unit, a notification unit for notifying the fact is provided.

Invention of Claim 13 in the inkjet recording device as described in any one of Claims 8-12 WHEREIN:
The control unit determines a detection result of the liquid amount detection unit every predetermined time, and detects an abnormality of the deaeration module on the condition that the increase in the predetermined amount of liquid amount is determined continuously for a predetermined number of times. It is characterized by.

  According to the present invention, it is possible to quickly detect an abnormality in the deaeration module.

1 is a schematic diagram illustrating an overall configuration of an ink jet recording apparatus according to an embodiment. It is a figure which shows the example of the change of the viscosity of the ink accompanying the temperature rise and fall of an ink. It is a figure explaining the flow path of an ink. It is sectional drawing of a deaeration module. It is a block diagram which shows the functional structure of an inkjet recording device. It is a flowchart explaining a vacuum control process. It is a figure explaining the temperature change of the vacuum path | route when the ink leak generate | occur | produces. It is a flowchart explaining a deaeration module abnormality detection process. It is a figure explaining the flow path of the ink in the inkjet recording device which concerns on 2nd Embodiment. It is a block diagram which shows the functional structure of the inkjet recording device which concerns on 2nd Embodiment. It is a flowchart explaining the deaeration module abnormality detection process in 2nd Embodiment.

  Hereinafter, an ink jet recording apparatus according to an embodiment of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples. In addition, in the following description, what has the same function and structure attaches | subjects the same code | symbol, and abbreviate | omits the description.

(First embodiment)
The ink jet recording apparatus 1 according to the first embodiment includes a paper feed unit 10, an image forming unit 20, a paper discharge unit 30, a control unit 40 (see FIG. 5), and an ink supply unit 50. Yes. 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 a 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. In addition, the recording medium P includes a supply unit that transfers the uppermost one to the belt 123. 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, and a delivery unit 26.

  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 on 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 individually 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 the present 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. The head unit 24 can constitute a line head by arranging a plurality of recording heads 24a (see FIG. 3).

  The irradiation unit 25 irradiates an energy ray for curing the ink after the ink used in the inkjet recording apparatus 1 of the present embodiment is ejected onto the recording medium P. The irradiation unit 25 includes, for example, a fluorescent tube such as a low-pressure mercury lamp, and emits the fluorescent tube to emit energy rays such as ultraviolet rays. 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. The irradiation unit 25 irradiates the recording medium P carried on the image forming drum 21 and ejects the ink with energy rays, and cures the ink ejected onto the recording medium P by the action of the energy rays.

  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, and may be any energy rays having a property of curing 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 rotationally drives a ring-shaped belt 263 by a plurality of (for example, two) rollers 261 and 262 to convey 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 ink supply unit 50 stores ink, supplies the ink to the head unit 24 of the image forming unit 20, and enables ink of each color to be ejected from the nozzles of the head unit 24.

  The ink used in the ink jet recording apparatus 1 of the present embodiment is not particularly limited, and is, for example, an ultraviolet (UV) curable ink. This UV curable ink undergoes a phase change between a gel state and a liquid (sol) state according to temperature in a state where UV is not irradiated. For example, the ink has a predetermined temperature, for example, a phase change temperature of about 40 ° C. to 100 ° C., and is uniformly liquefied (solified) by being heated and raised above the phase change temperature. On the other hand, the ink gels below the predetermined temperature including normal room temperature (0 ° C. to 30 ° C.).

  FIG. 2 shows an example of a change in the viscosity of the ink as the temperature of the ink increases and decreases. A broken line L1 indicates an example of change in the viscosity of the ink when the temperature rises, and a solid line L2 indicates an example of the change in the viscosity of the ink when the temperature decreases.

This ink undergoes a phase change between a gel state having a viscosity of 100 mPa · s or higher and a liquid (sol) state having a viscosity of less than 100 mPa · s (mainly less than 10 mPa · s). At this time, the ink viscosity change curve when the temperature rises (broken line L1) is different from the ink viscosity change curve when the temperature drops (solid line L2). When the temperature rises, the ink viscosity is less than 100 mPa · s when the ink temperature is 60 ° C. or higher. On the other hand, when the temperature drops, the ink viscosity exceeds 100 mPa · s when the ink temperature falls below 45 ° C. That is, in this ink example, when the temperature of the ink is 60 ° C. (T1: first temperature) or higher, the viscosity becomes less than 100 mPa · s and becomes liquid regardless of the temperature rise or fall, and is 45 ° C. ( When the temperature is less than (T2: second temperature), the viscosity exceeds 100 mPa · s and becomes a gel, regardless of whether the temperature rises or falls.
This ink manufacturing method is disclosed, for example, in JP2013-23063A.

  Next, the ink flow path in the inkjet recording apparatus 1 will be described with reference to FIG.

  In the ink jet recording apparatus 1 of the present embodiment, the ink pumped out from the ink tank 51 of the ink supply unit 50 by the supply pump 53 is supplied to each recording head 24a through the ink flow path 24b. Further, the ink that has not been ejected by each recording head 24a can be returned to the ink flow path 24b as necessary.

The ink flow path 24 b includes a first sub tank 241, a deaeration module 242, a liquid feed pump 243, a check valve 244, and a second sub tank 245.
The recording head 24a and the ink flow path 24b are heated and kept warm by an ink heating unit 270 such as a heater or a heat transfer member that transfers heat from the heater, so that the temperature of the ink is maintained at an appropriate temperature. Yes. As the heater of the ink heating unit 270, for example, a heating wire is used, and when energized, Joule heat is generated. As the heat transfer member, a member having high thermal conductivity, for example, a heat conduction plate formed of various metals (alloys) is used, and covers the piping of the ink flow path 24b, or the first sub tank 241 and the second sub tank 245. Or in contact with the side wall.

  The deaeration module 242 also measures a vacuum pump 249 for reducing the atmospheric pressure in the deaeration module 242, a vacuum path 250 connecting the vacuum pump 249 and the deaeration module 242, and an atmospheric pressure in the vacuum path 250. A pressure sensor 251 that connects to the vacuum path 250 and an atmosphere release valve 252 that can switch between an airtight state and an atmosphere release state are connected. In the present embodiment, a temperature detection unit 253 that detects the temperature in the vacuum path 250 is provided.

  The first sub tank 241 is an ink chamber having a smaller volume than the one or a plurality of ink tanks 51 that stores ink pumped from the ink tank 51 by the supply pump 53. The first sub tank 241 is provided with a first float sensor 241a, and the control unit 40 operates the supply pump 53 based on the liquid level position detection data by the first float sensor 241a to store a predetermined amount of ink. It has come to be.

  The deaeration module 242 is formed in, for example, a cylindrical shape, removes (degass) dissolved gas in the ink that has flowed in, and discharges the degassed ink. As shown in FIG. 4, the deaeration module 242 has a shape in which a large number of hollow fiber membranes 2426 are covered around 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 flows in from the ink inflow port 2422 flows out of the fine holes 2424b and flows out of the ink outflow port 2423. To do.

  The hollow fiber membrane 2426 has a number of hollow fine fiber structures closed at one end, and the membrane surface has gas permeability. The other end of the fine fiber structure of the hollow fiber membrane 2426 is connected to the gas outlet 2425 to which the vacuum path 250 is connected, and the atmospheric pressure is reduced by the air being sucked by the vacuum pump 249. In this state, when the ink contacts the membrane surface of the hollow fiber membrane 2426, only the dissolved gas in the ink selectively permeates the membrane surface and the ink is deaerated. The dissolved gas that has passed through the hollow fiber membrane 2426 flows down the vacuum path 250.

The vacuum pump 249 is a diaphragm pump including a pump chamber including a diaphragm that can be expanded and contracted, and a drive source that operates the diaphragm so that the volume of the pump chamber expands and contracts. The pump chamber is provided with a suction port provided with a check valve that allows only inflow of fluid from the outside, and a discharge port provided with a check valve that allows only discharge of fluid from the inside. .
In this diaphragm pump, if ink components adhere to the diaphragm or the check valve, the pump performance is deteriorated, and there is a possibility that the pump deteriorates and breaks down.

  The pressure sensor 251 detects the atmospheric pressure in the vacuum path 250 and outputs the result to the control unit 40. The control unit 40 drives and controls the vacuum pump 249 based on the detection result from the pressure sensor 251.

  The atmosphere release valve 252 is an electromagnetic valve that can switch the vacuum path 250 between an airtight state and an atmosphere release state in accordance with an operation command from the control unit 40.

  The temperature detector 253 detects the temperature in the vacuum path 250 and outputs the information to the controller 40. In the present embodiment, the temperature detection unit 253 is provided on the outer wall of the vacuum path 250 and the temperature of the outer wall of the vacuum path 250 is detected so as to be the temperature in the vacuum path 250. The portion 253 may be provided inside the vacuum path 250 so that the temperature in the vacuum path 250 can be directly detected. In the case where the temperature detection unit 253 is provided on the outer wall of the vacuum path 250, it is preferable that at least the detection part by the temperature detection unit 253 of the vacuum path 250 is made of a metal having good thermal conductivity such as an aluminum pipe, It does not have to be made of metal. Moreover, in order to improve temperature responsiveness, it is preferable to make the detection part by the temperature detection part 253 as thin as possible and to make heat capacity small, However, The thickness of the pipe | tube of the vacuum path | route 250 can be set suitably. In this embodiment, the temperature detector 253 is provided on the vacuum path 250. However, the temperature detector 253 may be provided in any location as long as the pressure is reduced by the vacuum pump 249. The module 242 may be provided in a space to which the vacuum path 250 is connected. In other words, in the present embodiment, as long as the atmospheric pressure is reduced by the vacuum pump 249, it can be referred to as a vacuum path including the inside of the deaeration module 242.

  The liquid feed pump 243 sends the ink flowing out from the ink outlet 2423 of the deaeration module 242 to the second sub tank 245. A check valve 244 is provided between the liquid feed pump 243 and the second sub tank 245 to prevent the ink once sent to the second sub tank 245 from flowing backward.

  The second sub tank 245 is a small ink chamber in which the ink deaerated by the deaeration module 242 is temporarily stored, and is approximately the same capacity as the first sub tank 241 although it is not particularly limited. The ink in the second sub tank 245 is connected to the inlet 240a of each recording head 24a, and ink corresponding to the amount of ink ejected from the nozzles is supplied to each recording head 24a. The second sub-tank 245 is provided with a second float sensor 245a, and the control unit 40 operates the liquid feed pump 243 based on the liquid level position detection data by the second float sensor 245a, thereby supplying a predetermined amount of ink. It is to be stored.

  The ink that has not been ejected from the nozzles of the recording head 24a can be returned to the first sub tank 241 from the outlet 240b via the recovery path 241b and the valve 241c. For example, when it is necessary to remove ink from the ink flow path 24b during maintenance of the recording head 24a, the ink in the recording head 24a can be collected without being discarded by opening the valve 241c.

  Next, the functional configuration of the inkjet recording apparatus 1 will be described with reference to FIG.

  The ink jet recording apparatus 1 includes a control unit 40, a transport driving unit 41, a head driving unit 42, a communication unit 43, an operation display unit 44, a paper heating unit 23, an irradiation unit 25, and an ink heater driving unit 27. A first float sensor 241a, a second float sensor 245a, a supply pump 53, a liquid feed pump 243, a vacuum pump 249, a pressure sensor 251, an atmosphere release valve 252, and a temperature detector 253. It is connected to the bus 49 so that signals can be transmitted and received with each other. The control unit 40 receives measurement signals, status signals, and the like from these units, and transmits a control signal that causes each unit to perform an appropriate operation.

  The control unit 40 controls the operation of each unit of the inkjet recording apparatus 1 and controls the entire operation. The control unit 40 includes a CPU (Central Processing Unit) 401, a ROM (Read Only Memory) 402, a RAM (Random Access Memory) 403, and the like. In the control unit 40, various processing programs such as a system program stored in the ROM 402 are read out and expanded in the RAM 403, and the program expanded in the RAM 403 is executed by the CPU 401. And various control processes such as a deaeration module abnormality detection process are executed.

  The conveyance drive unit 41 is various drive sources related to conveyance of the recording medium P such as the conveyance unit 12, the delivery unit 22, the image forming drum 21, and the delivery unit 26.

  The head driving unit 42 is a piezoelectric element provided for each nozzle of the recording head 24a. By driving the piezoelectric element, ink can be ejected from the nozzle.

  The communication unit 43 includes, for example, a network interface card (NIC) that is communicably connected to an external device such as a personal computer (PC) or a portable terminal via a communication line. Various communications are performed, such as receiving image data transmitted from the. The control unit 40 controls the operation of each unit of the inkjet recording apparatus 1 according to the image data acquired via the communication unit 43, and forms an image corresponding to the image data on the recording medium P.

  The operation display unit 44 that functions as a notification unit is configured by an LCD (Liquid Crystal Display), and displays various operation buttons and device statuses on the display screen according to instructions of a display signal input from the control unit 40, and the operation of each function. Displays the status etc. The LCD display screen is covered with a pressure-sensitive (resistive film pressure) touch panel that consists of transparent electrodes arranged in a grid, and detects the position coordinates pressed by a finger or touch pen as a voltage value. The detected position signal is output to the control unit 40 as an operation signal. The operation display unit 44 includes various operation buttons such as a numeric button and a start button, and outputs an operation signal generated by the button operation to the control unit 40.

  The ink heater drive unit 27 switches the energization state of the heater of the ink heating unit 270 to keep the ink heating unit 270 at an appropriate temperature, and heats each recording head 24a and the ink flow path 24b, whereby the ink is liquid (sol). ) Maintain a phase change to the state. For example, the energization state of the ink heater driving unit 27 is switched based on the temperature measured by the temperature sensor provided in each part of the ink heating unit 270.

  A vacuum control process executed by the control unit 40 of the inkjet recording apparatus 1 configured as described above will be described with reference to FIG.

  First, the control unit 40 closes the atmosphere release valve 252 so that the vacuum path 250 is airtight (step S101).

  The control unit 40 inputs the detection result from the pressure sensor 251 and specifies the atmospheric pressure A in the vacuum path 250 (step S102).

  The controller 40 determines whether or not the atmospheric pressure A in the vacuum path 250 is equal to or higher than a predetermined upper limit atmospheric pressure H (step S103). When it is determined that the pressure A in the vacuum path 250 is equal to or higher than the predetermined upper limit pressure H (step S103: Y), the control unit 40 starts driving the vacuum pump 249 to reduce the pressure in the vacuum path 250. (Step S104). On the other hand, when it is not determined that the pressure A in the vacuum path 250 is equal to or higher than the predetermined upper limit pressure H (step S103: N), the control unit 40 executes the process of step S105 without executing the process of step S104. To do.

  Subsequently, the control unit 40 determines whether or not the pressure A in the vacuum path 250 is equal to or lower than a predetermined lower limit pressure L (step S105). When it is determined that the atmospheric pressure A in the vacuum path 250 is equal to or lower than the predetermined lower limit atmospheric pressure L (step S105: Y), the control unit 40 stops driving the vacuum pump 249 (step S106) and then proceeds to step S102. Execute the process. In this state, the atmospheric pressure in the vacuum path 250 gradually increases due to the dissolved gas that has permeated through the hollow fiber membrane 2426 of the degassing module 242. On the other hand, when it is not determined that the atmospheric pressure A in the vacuum path 250 is equal to or lower than the predetermined lower limit atmospheric pressure L (step S105: N), the control unit 40 executes the process of step S102 without executing the process of step S106. To do.

  In this embodiment, by controlling in this way, when the atmospheric pressure in the vacuum path 250 reaches the upper limit atmospheric pressure H, the vacuum pump 249 continues to be driven until the lower limit atmospheric pressure L is reached. Until the pressure reaches the upper limit pressure H, the driving of the vacuum pump 249 is stopped.

  Since the hollow fiber membrane 2426 of the deaeration module 242 is formed thin, the hollow fiber membrane 2426 may be damaged due to the pressure difference at the membrane interface in use. Then, a large amount of ink enters the vacuum path 250 due to the damage of the hollow fiber membrane 2426. For example, as shown in FIG. 7, when the temperature in the vacuum path 250 in a normal state is about 30 ° C. and the ink is heated to 60 ° C. or higher, and the hollow fiber membrane 2426 is damaged, The temperature in the vacuum path 250 increases rapidly. In the present embodiment, an abnormality of the deaeration module 242, that is, breakage of the hollow fiber membrane 2426 can be detected by quickly detecting the temperature rise in the vacuum path 250 as follows.

  Next, the deaeration module abnormality detection process executed by the control unit 40 will be described with reference to FIG. The deaeration module abnormality detection process is, for example, a timer interrupt process executed every 0.1 seconds.

  First, the control unit 40 acquires temperature information from the temperature detection unit 253 (step S201). Subsequently, the control unit 40 calculates a temperature difference from the temperature information (temperature information acquired last time) acquired in step S201 of the deaeration module abnormality detection process executed last time and the temperature information acquired this time (step). S202). That is, the control unit 40 can specify the temperature difference in the vacuum path 250 for 0.1 seconds. The temperature information acquired this time is stored in the RAM 403 in order to be used as the temperature information acquired last time in the deaeration module abnormality detection process to be executed next time.

  The control unit 40 determines whether or not a temperature increase abnormality has occurred from the calculated temperature difference (step S203). Specifically, the control unit 40 determines whether or not there has been an increase of a predetermined temperature (for example, 0.5 ° C.) or more in the vacuum path 250 in 0.1 seconds.

  When it is determined that the temperature rise abnormality has occurred (step S203: Y), the control unit 40 determines whether or not the value of the continuous abnormality detection counter is 0 (step S204). That is, the control unit 40 determines whether it is the first time that it has been determined that the temperature rise is abnormal. The continuous abnormality detection counter is stored in the RAM 403, for example.

  When determining that the value of the continuous abnormality detection counter is 0 (step S204: Y), the control unit 40 sets the previously acquired temperature information stored in the RAM 403 as the determination reference temperature (step S205). . On the other hand, when it is not determined that the value of the continuous abnormality detection counter is 0 (step S204: N), the control unit 40 determines that the temperature increase abnormality is not the first time, that is, the temperature increase abnormality continuously. It is determined that the determination has been made, and the process of step S206 is executed without executing the process of step S205.

  The control unit 40 increments the value of the continuous abnormality detection counter stored in the RAM 403 by 1 (step S206), and then determines whether or not the value of the continuous abnormality detection counter is 10 or more (step S207). When it is determined that the value of the continuous abnormality detection counter is 10 or more (step S207: Y), the control unit 40 determines that an abnormality has occurred in the deaeration module 242 and opens the atmosphere release valve 252. At the same time, the driving of the vacuum pump 249 is stopped (step S208). Accordingly, it is possible to prevent the ink that has entered the vacuum path 250 from entering the vacuum pump 249 and causing a problem. In this embodiment, since it is determined that an abnormality has occurred in the deaeration module 242 when it is determined that the temperature increase abnormality is continuously performed 10 times or more (that is, continuously for 1 second), for example, temperature detection is performed by noise. It is possible to prevent the unit 253 from erroneously detecting and thereby erroneously determining the abnormality of the deaeration module 242.

  Subsequently, the control unit 40 calculates a temperature difference (t) between the temperature indicated by the temperature information acquired this time and the determination reference temperature stored in the RAM 403 (step S209).

  The control unit 40 determines whether or not the temperature difference (t) between the temperature indicated by the temperature information acquired this time and the determination reference temperature is greater than 5 ° C. and 10 ° C. or less (step S210). When the controller 40 determines that the temperature difference (t) between the temperature indicated by the temperature information acquired this time and the determination reference temperature is greater than 5 ° C. and 10 ° C. or less (step S210: Y), Although an abnormality has occurred in the deaeration module 242, assuming that the degree of abnormality is small, if image formation is being performed by the image forming unit 20, the image forming operation should be terminated after completion of the image formation being performed. Is controlled (step S211). Then, the control unit 40 displays “error 1” on the display screen of the operation display unit 44 (step S212), and then ends this process. The display of “Error 1” is, for example, a display such as “There is a possibility of abnormality in the deaeration module. Please confirm.”, And prompts the user to confirm the deaeration module 242.

  On the other hand, when the controller 40 does not determine in step S210 that the temperature difference (t) between the temperature indicated by the temperature information acquired this time and the determination reference temperature is greater than 5 ° C. and 10 ° C. or less ( Step S210: N), when it is determined that the temperature difference (t) between the temperature indicated by the temperature information acquired this time and the determination reference temperature is larger than 10 ° C., and the image forming unit 20 is executing image formation. Then, control for forcibly interrupting the image forming operation being executed is performed (step S213). Then, the control unit 40 displays “Error 2” on the display screen of the operation display unit 33 (step S214), and then ends this process. The display of “Error 2” is, for example, a display such as “An error has occurred in the deaeration module. Replace it promptly”, and prompts the user to replace the deaeration module 242.

  In addition, when it is determined in step S207 that the value of the continuous abnormality detection counter is not less than 10 (step S207: N), the control unit 40 performs this process without executing the processes of steps S208 to S214. finish.

  Further, when the controller 40 does not determine in step S203 that a temperature increase abnormality has occurred (step S203: N), the controller 40 determines that there is no abnormality in the deaeration module 242, and detects the continuous abnormality stored in the RAM 403. After clearing the counter value (step S215), this process is terminated.

  In the present embodiment, since it is configured as described above, when the hollow fiber membrane 2426 is broken and ink enters the vacuum path 250, this can be detected quickly, so the hollow fiber membrane An immediate detection of 2426 breakage is possible. As a result, the image forming operation by the image forming unit 20 can be quickly stopped to prevent the occurrence of a nozzle defect due to the fact that the deaeration is not normally performed. Can be reduced. In addition, the drive of the vacuum pump 249 can be quickly stopped to prevent ink from entering the vacuum pump 249 and causing problems. Furthermore, since the time required for the recovery operation of the recording head 24a due to the occurrence of defective nozzles can be reduced, the productivity can be improved and the waste of ink can be suppressed.

  Note that the hollow fiber membrane 2426 of the deaeration module 242 in this embodiment infiltrates not only the dissolved gas contained in the ink but also a very small amount of liquid component into the vacuum path 250 through the hollow fiber membrane 2426 in practice. In some cases, an ink trap for storing the ink trap may be provided before the vacuum pump 249 in the vacuum path 250. According to this, the vacuum pump 249 can be more reliably protected.

  In the present embodiment, when the abnormality in temperature rise is continuously determined 10 times every 0.1 second (that is, when abnormality in temperature increase is determined continuously for 1 second), the deaeration module 242 Although it is determined whether or not an abnormality has occurred, it is determined that an abnormality has occurred in the deaeration module 242 when there is an abnormality in the temperature increase per unit time without counting the number of consecutive temperature increase abnormalities. You may do it.

  Further, in the present embodiment, the image formation operation control is changed according to the temperature difference between the temperature indicated by the temperature information acquired this time and the determination reference temperature, but it is determined that the temperature is indicated by the temperature information acquired this time. If the temperature difference from the reference temperature is equal to or higher than a predetermined temperature, the image forming operation may be controlled to be stopped after the end of image formation, or the image forming operation being executed is forcibly interrupted. It may be.

  As described above, according to the first embodiment, the deaeration module 242 is provided in the ink flow path 24b that supplies ink heated to a predetermined temperature from the ink tank 51 to the recording head 24a. The hollow fiber membrane 2426 which can permeate the dissolved gas is contained inside. The vacuum pump 249 reduces the atmospheric pressure in the deaeration module 242. The vacuum path 250 allows the dissolved gas removed by the degassing module 242 to flow down. The temperature detector 253 detects the temperature in the vacuum path 250. The controller 40 detects an abnormal temperature rise in the vacuum path 250 based on the detection result by the temperature detector 253. As a result, when the gas permeable membrane of the deaeration module is damaged and the heated ink enters the vacuum path, this can be detected quickly, and therefore the abnormality of the deaeration module can be detected quickly. become.

  Further, according to the first embodiment, the control unit 40 performs control to stop the driving of the vacuum pump 249 when detecting an abnormal temperature rise in the vacuum path 250. As a result, when the gas permeable membrane of the deaeration module is broken and heated ink enters the vacuum path, the operation of the vacuum pump can be stopped quickly, so that the ink enters the vacuum pump. It is possible to prevent problems from occurring.

  Further, according to the first embodiment, the control unit 40 performs control to stop the image forming operation by the image forming unit 20 when detecting an abnormal temperature rise in the vacuum path 250. As a result, the gas permeation membrane of the deaeration module is damaged, so that the deaeration is not normally performed, and it is possible to reduce the deterioration of the image due to the nozzle malfunction.

  Further, according to the first embodiment, the control unit 40 stops driving the vacuum pump 249 when the temperature rise in the vacuum path 250 is larger than the first change amount (10 ° C.), and When image formation by the image forming unit 20 is being executed, control is performed to interrupt the image formation being executed, and a second change amount (5) in which the temperature rise in the vacuum path 250 is smaller than the first change amount. When the image forming unit 20 is in the process of forming an image, the image forming unit 20 is currently performing image formation. After the completion, control for stopping the image forming operation by the image forming unit 20 is performed. As a result, the abnormality of the deaeration module can be quickly detected to protect the vacuum pump, and the image forming operation can be selected to be interrupted or continued depending on the degree of abnormality of the deaeration module. Thus, it becomes possible to reduce the decrease in productivity.

  Further, according to the first embodiment, the operation display unit 44 notifies the user when the control unit 40 detects an abnormality in the temperature increase in the vacuum path 250. Can be easily recognized.

  In addition, according to the first embodiment, the temperature detection unit 253 detects the temperature in the vacuum path 250 that connects the deaeration module 242 and the vacuum pump 249, so that the temperature detection unit is easily installed. Therefore, the manufacturing cost is excellent.

  Further, according to the first embodiment, the control unit 40 determines a detection result by the temperature detection unit 253 every predetermined time, and vacuums on the condition that a predetermined amount of temperature increase is determined continuously for a predetermined number of times. An abnormal temperature rise in the path 250 is detected. As a result, it is possible to prevent erroneous determination of a problem of the deaeration module based on erroneous detection of the temperature detection unit due to noise or the like, so that determination accuracy can be improved.

(Second Embodiment)
Next, an ink jet recording apparatus according to a second embodiment will be described.
For example, as shown in FIGS. 9 and 10, the ink jet recording apparatus 1 according to the second embodiment replaces the temperature detection unit 253 with ink that has leaked from the deaeration module 242 and entered the vacuum path 250. An ink trap 254 for storage is provided on the vacuum path 250. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  As shown in FIG. 9, the ink trap 254 has an original function of suppressing pressure fluctuation in the vacuum path 250 due to pulsation of the vacuum pump 249. Even if ink enters the vacuum path 250 from the gas module 242, it has a function of capturing and storing the ink inside, and can prevent ink from reaching the vacuum pump 249. Accordingly, it is possible to prevent the vacuum pump 249 from being deteriorated in performance by the ink, deteriorated, and broken down. A valve for extracting ink stored in the ink trap 254 may be provided.

  The ink trap 254 is provided with a liquid amount detection unit 254a. The liquid amount detection unit 254a is configured by, for example, a float sensor, but any device that can detect the amount of ink stored in the ink trap 254, such as a liquid level sensor or a weight sensor, is used. Also good. As shown in FIG. 10, the liquid amount detection unit 254 a is connected to the bus 49, detects the amount of ink stored in the ink trap 254, and outputs the detection result to the control unit 40. As described above, in the present embodiment, the abnormality of the deaeration module 242 is detected by detecting the amount of ink stored in the ink trap 254.

  Next, deaeration module abnormality detection processing executed by the control unit 40 of the inkjet recording apparatus 1 according to the second embodiment will be described with reference to FIG. The deaeration module abnormality detection process in the second embodiment is, for example, a timer interruption process executed every second.

  First, the control unit 40 acquires the liquid amount information in the ink trap 254 from the liquid amount detection unit 254a (step S301). Subsequently, the control unit 40 calculates the difference in liquid amount from the liquid amount information (liquid amount information acquired last time) acquired in step S301 of the deaeration module abnormality detection process executed last time and the liquid amount information acquired this time. (D) is calculated (step S302). That is, the control unit 40 can specify the amount of ink fluctuation in the ink trap 254 in one second. The liquid amount information acquired this time is stored in the RAM 403 in order to be used as the liquid amount information acquired last time in the deaeration module abnormality detection process executed next time.

  The control unit 40 determines whether or not the calculated liquid amount difference (d) is larger than 0.1 cc (step S303). That is, the control unit 40 determines whether or not the amount of ink stored in the ink trap 254 has increased by more than 0.1 cc in one second.

  When it is determined that the calculated difference (d) in the liquid amount is greater than 0.1 cc (step S303: Y), the control unit 40 determines that an abnormality has occurred in the deaeration module 242, and the air release valve 252 Is opened and the driving of the vacuum pump 249 is stopped (step S304). Accordingly, it is possible to prevent the ink that has entered the vacuum path 250 from entering the vacuum pump 249 and causing a problem.

  Subsequently, the control unit 40 determines whether or not the calculated difference (d) in the liquid amount is larger than 1.0 cc (step S305). When the controller 40 does not determine that the calculated liquid amount difference (d) is greater than 1.0 cc (step S305: N), an abnormality has occurred in the deaeration module 242, but the degree of abnormality is small. When image formation by the image forming unit 20 is being executed, control is performed so as to end the image forming operation after completion of the image formation being executed (step S306). Then, the control unit 40 displays “error 1” on the display screen of the operation display unit 44 (step S307), and then ends this process.

  On the other hand, when the control unit 40 determines in step S305 that the calculated difference (d) in the liquid amount is larger than 1.0 cc (step S305: Y), the image forming unit 20 is executing image formation. In that case, control is performed to forcibly interrupt the image forming operation being executed (step S308). Then, the control unit 40 displays “Error 2” on the display screen of the operation display unit 33 (Step S309), and ends this process.

  Further, when the controller 40 does not determine in step S303 that the calculated difference (d) in the liquid amount is greater than 0.1 cc (step S303: N), the controller 40 determines that there is no abnormality in the deaeration module 242. Then, this process ends.

  In the present embodiment, since it is configured as described above, when the hollow fiber membrane 2426 is broken and ink enters the vacuum path 250, it is captured by the ink trap 254 and stored in the ink trap 254. Since this can be detected based on the amount of the ink that has been removed, breakage of the hollow fiber membrane 2426 can be quickly detected. In addition, since the ink trap 254 is provided and the ink that has entered the vacuum path 250 can be captured, the vacuum pump 249 can be reliably protected. In addition, this makes it possible to quickly stop the image forming operation by the image forming unit 20 and to suppress the occurrence of nozzle malfunctions caused by the fact that deaeration is not performed normally, and to reduce image deterioration due to this, Generation of waste paper can be reduced. Furthermore, since the time required for the recovery operation of the recording head 24a due to the occurrence of defective nozzles can be reduced, the productivity can be improved and the waste of ink can be suppressed.

  In the present embodiment, it is determined that an abnormality has occurred in the deaeration module 242 when it is determined that the fluctuation of the liquid amount exceeds a predetermined amount. However, as in the first embodiment, for example, When abnormality of the fluctuation of the liquid amount is determined every predetermined time (for example, 0.1 seconds), and this is continued for a predetermined number of times (for example, 10 times). It may be determined whether an abnormality has occurred in the deaeration module 242.

  Further, the present embodiment can also be applied to an ink jet recording apparatus that uses ink that is used without being heated.

  As described above, according to the second embodiment, the deaeration module 242 is provided in the ink flow path 24b that supplies ink from the ink tank 51 to the recording head 24a, and can transmit the dissolved gas in the ink. A hollow fiber membrane 2426. The vacuum pump 249 reduces the atmospheric pressure in the deaeration module 242. The vacuum path 250 connects the degassing module 242 and the vacuum pump 249 and causes the dissolved gas removed by the degassing module 242 to flow down. The ink trap 254 is provided on the vacuum path 250 and stores ink leaked from the hollow fiber membrane 2426. The liquid amount detection unit 254a detects the amount of ink in the ink trap 254. The control unit 40 detects an abnormality of the deaeration module 242 based on the detection result by the liquid amount detection unit 254a. As a result, when the gas permeable membrane of the deaeration module is damaged and the heated ink enters the vacuum path, this can be detected quickly, and therefore the abnormality of the deaeration module can be detected quickly. become. Further, since the ink leaked from the deaeration module can be captured by the ink trap, it is possible to prevent the ink from entering the vacuum pump to deteriorate the performance of the vacuum pump, to deteriorate, and to break down.

  Further, according to the second embodiment, the control unit 40 performs control to stop the driving of the vacuum pump 249 when the abnormality of the deaeration module 242 is detected. As a result, it is possible to more reliably prevent ink from entering the vacuum pump.

  Further, according to the second embodiment, the control unit 40 performs control to stop the image forming operation by the image forming unit 20 when the abnormality of the deaeration module 242 is detected. As a result, the gas permeation membrane of the deaeration module is damaged, so that the deaeration is not normally performed, and it is possible to reduce the deterioration of the image due to the nozzle malfunction.

  Further, according to the second embodiment, the control unit 40 drives the vacuum pump 249 when the increase amount of the ink liquid amount in the ink trap 254 is larger than the first increase amount (1.0 cc). In addition, when image formation by the image forming unit 20 is being executed, control is performed to interrupt the image formation that is being executed, and the amount of increase in the amount of ink in the ink trap 254 is greater than the first increase amount. Is smaller than the second increase amount (0.1 cc) and less than or equal to the first increase amount, the driving of the vacuum pump 249 is stopped and image formation by the image forming unit 20 is being executed. In this case, control is performed to stop the image forming operation by the image forming unit 20 after the image formation being executed is completed. As a result, the abnormality of the deaeration module can be quickly detected to protect the vacuum pump, and the image forming operation can be selected to be interrupted or continued depending on the degree of abnormality of the deaeration module. Thus, it becomes possible to reduce the decrease in productivity.

  Further, according to the second embodiment, the operation display unit 44 notifies the user when the abnormality of the deaeration module 242 is detected by the control unit 40, so that the user can easily detect the abnormality of the deaeration module. You will be able to recognize.

  Further, according to the second embodiment, the control unit 40 determines the detection result by the liquid amount detection unit 254a every predetermined time, and determines that the increase in the liquid amount of the predetermined amount has been continuously determined a predetermined number of times. Abnormality of the deaeration module 242 is detected as a condition. As a result, it is possible to prevent erroneous determination of a malfunction of the deaeration module based on erroneous detection of the liquid amount detection unit 254a due to noise or the like, so that determination accuracy can be improved.

  The description in the embodiment of the present invention is an example of the ink jet recording apparatus according to the present invention, and the present invention is not limited to this. The detailed configuration and detailed operation of each functional unit constituting the ink jet recording apparatus can be appropriately changed.

  In the present embodiment, the image forming operation is stopped when an abnormality of the deaeration module 242 is detected.

  Moreover, in this Embodiment, when abnormality of the deaeration module 242 was detected, it alert | reported by displaying an error in the operation display part 44, However, Notification by audio | voice output may be sufficient, LED ( Notification by light emission of a light emitter such as a light emitting diode may be used. Moreover, it is not necessary to notify when the abnormality of the deaeration module 242 is detected.

  Moreover, in this Embodiment, it is applicable also to any of an external reflux type hollow fiber deaeration module and an internal reflux type hollow fiber deaeration module.

  In the present embodiment, an example in which a hard disk, a semiconductor nonvolatile memory, or the like is used as a computer-readable medium for the program according to the present invention is disclosed, but the present invention is not limited to this example. As another computer-readable medium, a portable recording medium such as a CD-ROM can be applied. A carrier wave is also used as a medium for providing program data according to the present invention via a communication line.

  As described above, the present invention is suitable for providing an ink jet recording apparatus that can quickly detect an abnormality in a deaeration module.

DESCRIPTION OF SYMBOLS 1 Inkjet recording device 20 Image formation part 24b Ink flow path (ink supply path)
40 Control unit 44 Operation display unit (notification unit)
51 Ink tank 242 Deaeration module 2426 Hollow fiber membrane (gas permeable membrane)
249 Vacuum pump 250 Vacuum path 253 Temperature detection unit 254 Ink trap 254a Liquid amount detection unit

Claims (13)

A degassing module provided on an ink supply path for supplying ink heated to a predetermined temperature from an ink tank to an ink jet head and having a gas permeable membrane capable of transmitting dissolved gas in the ink; and the inside of the degassing module An ink jet recording apparatus that removes dissolved gas in the heated ink through the gas permeable film by reducing the pressure in the deaeration module by the vacuum pump. ,
A vacuum path through which the dissolved gas removed by the degassing module flows down;
A temperature detector for detecting the temperature in the vacuum path;
A control unit for detecting an abnormal temperature rise in the vacuum path based on a detection result by the temperature detection unit;
An ink jet recording apparatus comprising:   The ink jet recording apparatus according to claim 1, wherein the control unit performs control to stop driving of the vacuum pump when detecting an abnormality in temperature rise in the vacuum path. An image forming unit that discharges ink from the inkjet head to form an image on a recording medium;
3. The ink jet recording apparatus according to claim 1, wherein the control unit performs control to stop an image forming operation by the image forming unit when detecting an abnormal temperature rise in the vacuum path. 4. . An image forming unit that discharges ink from the inkjet head to form an image on a recording medium;
The controller stops driving the vacuum pump when the temperature rise in the vacuum path is larger than the first change amount, and when the image forming unit is executing image formation, When the control for interrupting the image formation in progress is performed, and the temperature rise in the vacuum path is larger than the second change amount smaller than the first change amount and not more than the first change amount. In addition, the control of stopping the vacuum pump drive and stopping the image forming operation by the image forming unit after the image forming in progress is completed when the image forming unit is executing the image forming. The inkjet recording apparatus according to claim 1, wherein the inkjet recording apparatus is performed.   5. The ink jet recording apparatus according to claim 1, further comprising a notifying unit that notifies that when the control unit detects an abnormality in a temperature rise in the vacuum path.   The ink jet recording apparatus according to claim 1, wherein the vacuum path connects the deaeration module and the vacuum pump.   The controller determines a detection result by the temperature detector every predetermined time, and detects an abnormality of the temperature increase in the vacuum path on condition that a predetermined amount of temperature increase is determined continuously for a predetermined number of times. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is an ink jet recording apparatus. A degassing module provided on an ink supply path for supplying ink from an ink tank to an ink jet head and having a gas permeable membrane capable of transmitting dissolved gas in the ink therein, and a vacuum for reducing the pressure in the degassing module An inkjet recording apparatus that removes dissolved gas in the ink through the gas permeable membrane by reducing the atmospheric pressure in the degassing module by the vacuum pump,
Connecting the degassing module and the vacuum pump, and a vacuum path through which the dissolved gas removed by the degassing module flows down,
An ink trap provided on the vacuum path and storing ink leaked from the gas permeable membrane;
A liquid amount detector for detecting the amount of ink in the ink trap;
A control unit for detecting an abnormality of the deaeration module based on a detection result by the liquid amount detection unit;
An ink jet recording apparatus comprising:   The ink jet recording apparatus according to claim 8, wherein the control unit performs control to stop driving of the vacuum pump when an abnormality of the deaeration module is detected. An image forming unit that discharges ink from the inkjet head to form an image on a recording medium;
The ink jet recording apparatus according to claim 8, wherein the control unit performs control to stop an image forming operation by the image forming unit when an abnormality of the deaeration module is detected. An image forming unit that discharges ink from the inkjet head to form an image on a recording medium;
The control unit stops driving the vacuum pump and is executing image formation by the image forming unit when the increase amount of the ink liquid amount in the ink trap is larger than the first increase amount. In this case, control is performed to interrupt the image formation that is being performed, and the amount of increase in the amount of ink in the ink trap is greater than the second increase that is smaller than the first increase, and the first The driving of the vacuum pump is stopped when the increase amount is equal to or less than 1, and when the image formation by the image forming unit is being executed, the image by the image forming unit is completed after the image forming is being executed. The inkjet recording apparatus according to claim 8, wherein control for stopping the forming operation is performed.   The inkjet recording apparatus according to any one of claims 8 to 11, further comprising a notification unit configured to notify the controller when an abnormality of the deaeration module is detected by the control unit.   The control unit determines a detection result of the liquid amount detection unit every predetermined time, and detects an abnormality of the deaeration module on the condition that the increase in the predetermined amount of liquid amount is determined continuously for a predetermined number of times. The inkjet recording apparatus according to any one of claims 8 to 12, wherein

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