JP2018008475A - Image forming apparatus and image forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus and an image forming method which cool the inside of the apparatus in a short time when a conveyance failure is detected.SOLUTION: An image forming apparatus comprises: a conveyance part for conveying, along a conveyance path, a recording medium supported by a guide surface of which temperature is higher than a first temperature; a blowing part in which gas blowing ports are disposed facing the guide surface and which dries ink by blowing gas of which temperature is higher than a second temperature from the gas blowing ports; a conveyance failure detection part for detecting a conveyance failure of the recording medium in the conveyance part; and a control part which, upon detection of a conveyance failure, stops conveyance of the recording medium by the conveyance part, sets the temperature of the guide surface lower than the first temperature, and sets the temperature of gas blown from the gas blowing ports lower than the second temperature.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an image forming apparatus and an image forming method, and more particularly to an image forming apparatus and an image forming method for detecting a conveyance abnormality in a drying unit.

  There is known an image forming apparatus that records an image by applying ink to a recording medium such as paper. As an example of the image forming apparatus, there is an ink jet printer that records an image on a recording medium by ejecting ink droplets from a nozzle of a liquid ejection head.

  There is also known a drying device that dries a recording medium to which ink has been applied. For example, Patent Document 1 discloses an ink drying apparatus that arranges a plurality of halogen lamps that generate radiant energy and directs the radiant heat toward the recording paper by a reflector to uniformly dry the ink on the recording paper.

  Further, in Patent Document 1, when an abnormality is detected in the dry region when the heater is being driven, for example, when a recording paper jam occurs, the control means stops driving the heater, Only the cooling means is driven so that the drying area is not overheated, so that the drying area is reliably cooled.

JP 2001-096727 A

  Although the drying apparatus described in Patent Document 1 uses a fan as a cooling means, it takes time to cool a member having a large heat capacity in air cooling. In particular, a commercial ink jet printer has a large heater capacity, so that peripheral members are likely to become high temperature, and a conveyance guide plate having a large heat capacity disposed immediately below the heater is difficult to cool once the temperature rises, so this problem becomes remarkable.

  In addition, since the recording medium to be conveyed is guided by the conveyance guide plate, there is a high possibility that the operator touches the conveyance guide plate when removing the conveyance medium with poor conveyance, and there is a risk of the operator being burned. It was. Therefore, it is desirable to cool the apparatus in a short time.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an image forming apparatus and an image forming method capable of cooling the inside of the apparatus in a short time when a conveyance failure is detected.

  In order to achieve the above object, an aspect of the image forming apparatus includes an image recording unit that records an image by applying ink to a recording surface of a recording medium, and a recording medium on which the image is recorded on a recording surface. A guide part that is supported by a guide surface at a higher temperature, a transport part that transports the recording medium supported by the guide surface along the transport path, and a gas outlet that is opposed to the guide surface are arranged from the gas outlet. A blower that blows a gas having a temperature higher than the second temperature to dry the ink, a conveyance failure detection unit that detects a conveyance failure of the recording medium in the conveyance unit, and a recording medium by the conveyance unit when a conveyance failure is detected And a controller for lowering the temperature of the guide surface to a temperature lower than the first temperature and setting the temperature of the gas blown from the gas outlet to a temperature lower than the second temperature.

  According to this aspect, when a conveyance failure is detected, the conveyance of the recording medium by the conveyance unit is stopped, the temperature of the guide surface is made lower than the first temperature, and the temperature of the gas blown from the gas outlet is set to the second temperature. Since the temperature is lower than the temperature, the inside of the apparatus can be cooled in a short time when a conveyance failure is detected.

  A liquid-feeding section for feeding a liquid having a temperature higher than the first temperature; and a pipe provided in the guide section for feeding the liquid. It is preferable to send a liquid having a temperature lower than one temperature. As a result, the guide unit can be cooled in a short time when a conveyance failure is detected while promoting drying of the recording medium.

  The liquid feeding section includes a high temperature liquid feeding section for feeding a liquid having a temperature higher than the first temperature and a low temperature liquid feeding section for feeding a liquid having a temperature lower than the first temperature. On the other hand, it is preferable to provide a valve for switching between liquid feeding by the high-temperature liquid feeding unit and liquid feeding by the low-temperature liquid feeding unit. Thereby, the inside of the apparatus can be cooled in a short time when a conveyance failure is detected while promoting drying of the recording medium.

  The blower unit includes a first heater that heats the gas and a fan that blows the heated gas. When a conveyance failure is detected, the control unit stops heating by the first heater and blows air from the fan. It is preferable to continue. Thereby, the inside of the apparatus can be cooled in a short time when a conveyance failure is detected while promoting drying of the recording medium.

  A cover that covers at least the guide unit and the air blowing unit, an external air intake port and an external air exhaust port that are provided on the cover and communicates between the outside and the inside of the cover, and an air intake from the external air intake port to supply to the air blowing unit An intake blower that sucks in the gas supplied to the guide surface by the air blower and discharges it to the exhaust port outside the machine, and a first circulation valve and a second circulation valve, each composed of a three-way valve. A first circulation valve communicating with the outside air intake port, the intake blower, and the second circulation valve; and a second circulation valve communicating with the exhaust blower, the outside air exhaust port, and the first circulation valve; The first circulation valve mixes the gas sucked from the outside air intake port and the gas sucked from the second circulation valve and sucks the first air volume by the intake blower. Discharged by air volume The gas is separated into a gas exhausted from the external exhaust port and a gas supplied to the first circulation valve, and when the conveyance failure is detected, the control unit sucks the gas from the external intake port in the first circulation valve. It is preferable to increase the ratio of gas and increase the ratio of gas discharged from the external exhaust port in the second circulation valve. Thereby, the inside of the apparatus can be cooled in a short time when a conveyance failure is detected while promoting drying of the recording medium.

  When the conveyance failure is detected, the control unit preferably sets the intake blower to an air volume larger than the first air volume and sets the exhaust blower to an air volume larger than the second air volume. Thereby, when a conveyance failure is detected, the inside of the apparatus can be cooled in a short time.

  A suction force generation unit that sucks the recording medium supported by the guide surface to the guide surface with a first suction force, and the control unit detects the suction force generated by the suction force generation unit when the conveyance failure is detected. It is preferable to make it larger. Thereby, even if the air volume of the intake blower and the exhaust blower is increased, the recording medium can be prevented from flapping.

  A temperature sensor that measures the temperature inside the cover; an opening / closing door provided in the cover; and a lock unit that locks the opening / closing door, and the control unit is configured to measure the temperature sensor when the measurement result is higher than the third temperature. It is preferable that the opening / closing door is locked by the lock portion. Thereby, it is possible to prevent the operator from being burned when removing the recording medium with poor conveyance.

  When the conveyance failure is detected, the control unit displays on the display unit that the conveyance failure has occurred, the inside of the apparatus is at a high temperature, and the door is locked. Is preferred. Thereby, the operator can know that the conveyance failure has occurred, the inside of the apparatus is at a high temperature, and the door is locked.

  It is preferable to include a second heater that is disposed opposite to the guide surface and that heats the recording medium to be conveyed, and that the controller stops heating by the second heater when a conveyance failure is detected. Thereby, the inside of the apparatus can be cooled in a short time when a conveyance failure is detected while promoting drying of the recording medium.

  The conveying unit preferably conveys the recording medium by gripping the leading end of the recording medium with a gripper and running the gripper. The conveyance unit may include a belt as a guide unit, support the recording medium using the surface of the belt as a guide surface, and convey the recording medium by running the belt. This aspect can be applied to a transport unit that transports a recording medium by traveling a gripper or a transport unit that transports a recording medium by traveling a belt.

  In order to achieve the above object, one aspect of an image forming method includes an image recording step of recording an image by applying ink to a recording surface of a recording medium, and a recording medium on which the image is recorded on a recording surface. A conveying step of supporting the recording medium supported by the guide surface at a temperature higher than the first temperature and conveying the recording medium supported by the guide surface along the conveying path, and a gas of the blower section in which the gas outlet is disposed facing the guide surface A blowing step for blowing a gas having a temperature higher than the second temperature from the blower outlet to dry the ink, a conveyance failure detection step for detecting a conveyance failure of the recording medium in the conveyance step, and a conveyance step when a conveyance failure is detected. And a control step of stopping the conveyance of the recording medium by setting the temperature of the guide surface to a temperature lower than the first temperature and setting the temperature of the gas blown from the gas outlet to a temperature lower than the second temperature.

  According to this aspect, when a conveyance failure is detected, the conveyance of the recording medium by the conveyance unit is stopped, the temperature of the guide surface is made lower than the first temperature, and the temperature of the gas blown from the gas outlet is set to the second temperature. Since the temperature is lower than the temperature, the inside of the apparatus can be cooled in a short time when a conveyance failure is detected.

  A non-transitory recording medium in which a computer-readable code of the program is recorded is also included in this aspect.

  According to the present invention, the inside of the apparatus can be cooled in a short time when a conveyance failure is detected.

Overall configuration diagram showing an embodiment of an inkjet recording apparatus The figure which shows the structure of an ink drying process part Perspective view of the ink drying processing unit Perspective view of the open / close cover from the side Part A view of FIG. 4 Block diagram showing schematic configuration of control system of inkjet recording apparatus Flow chart showing processing of image forming method The figure which shows an example of the display content of a display part The figure which shows an example of the display content of a display part The figure which shows the structure of an ink drying process part

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>
[Overall configuration of inkjet recording apparatus]
FIG. 1 is an overall configuration diagram showing an embodiment of an ink jet recording apparatus according to the present embodiment.

  The ink jet recording apparatus 10 (an example of an image forming apparatus) is an ink jet recording apparatus that records an image by an ink jet method using aqueous ink using an aqueous medium on a sheet of paper P. The sheet feeding unit 12 that performs processing, the processing liquid application unit 14 that applies the processing liquid to the recording surface of the paper P that is fed from the paper feeding unit 12, and the drying of the paper P that has been applied with the processing liquid by the processing liquid application unit 14. A processing liquid drying processing unit 16 that performs processing, an image recording unit 18 that records an image on the recording surface of the paper P that has been subjected to drying processing by the processing liquid drying processing unit 16, and an image is recorded by the image recording unit 18. The ink drying processing unit 20 performs a drying process of the recorded paper P, and the paper discharge unit 24 stacks the paper P to be discharged after finishing all the processes. The paper P is transported from the paper supply unit 12 to the paper discharge unit 24 by a transport unit including a drum-type transport unit and a chain gripper-type transport unit described below.

<Paper Feeder>
The sheet feeding unit 12 feeds the sheets P stacked on the sheet feeding table 30 to the processing liquid applying unit 14 one by one. The sheet feeding unit 12 mainly includes a sheet feeding table 30, a soccer device 32, a sheet feeding roller pair 34, a feeder board 36, a front pad 38, and a sheet feeding drum 40.

  The paper P is placed on the paper feed table 30 in a bundle state in which a large number of sheets are stacked. The paper feed table 30 is provided so as to be movable up and down by a paper feed table lifting device (not shown). The drive of the paper feed platform lifting / lowering device is controlled in conjunction with the increase / decrease of the paper P loaded on the paper feed platform 30 so that the paper P positioned at the top of the bundle is always positioned at a constant height. Then, the paper feed table 30 is moved up and down.

  The paper P as the recording medium is not particularly limited, but general-purpose printing paper mainly composed of cellulose, such as so-called high-quality paper, coated paper, or art paper, used in general offset printing or the like can be used. In the present embodiment, coated paper is used. The coated paper is obtained by applying a coating material to the surface of high-quality paper or neutral paper that has not been surface-treated, and providing a coating layer. Specifically, art paper, coated paper, lightweight coated paper, finely coated paper and the like are preferably used.

  The soccer device 32 picks up the sheets P stacked on the sheet feeding table 30 one by one from the top and feeds them to the pair of sheet feeding rollers 34. The soccer device 32 includes a suction foot 32A that is movable up and down and swingable. The suction foot 32A sucks and holds the upper surface of the paper P, and the paper P is fed from the paper feed table 30 to the paper feed roller pair 34. Transport. At this time, the suction foot 32A sucks and holds the top surface of the leading end of the paper P positioned at the top of the bundle, pulls up the paper P, and the pair of paper P that forms the pair of paper feeding rollers 34 is formed at the leading end of the paper P that is pulled up. Between the rollers 34A and 34B.

  The paper feed roller pair 34 is composed of a pair of upper and lower rollers 34A and 34B that are pressed against each other. In the pair of upper and lower rollers 34A and 34B, the roller 34A is a driving roller and the roller 34B is a driven roller, and the roller 34A that is a driving roller is driven to rotate by a motor (not shown). The motor is driven in conjunction with the feeding of the paper P. When the paper P is fed from the soccer device 32, the motor 34A is rotated in accordance with the timing. The paper P inserted between the pair of upper and lower rollers 34A and 34B is nipped by the rollers 34A and 34B and sent out in the direction in which the feeder board 36 is installed.

  The feeder board 36 is formed corresponding to the paper width, and receives the paper P sent out from the paper feed roller pair 34 and guides it to the front pad 38. The feeder board 36 is installed such that the front end side is inclined downward, and the sheet P placed on the conveyance surface is slid along the conveyance surface and guided to the front pad 38.

  On the feeder board 36, a plurality of tape feeders 36A for conveying the paper P are installed at intervals in the width direction. The tape feeder 36A is endless and is driven to rotate by a motor (not shown). The paper P placed on the conveyance surface of the feeder board 36 is fed by the tape feeder 36A and conveyed on the feeder board 36.

  A retainer 36B and a roller 36C are installed on the feeder board 36.

  A plurality of the retainers 36 </ b> B are arranged in a longitudinal line along the conveyance surface of the paper P. FIG. 1 discloses an example in which two retainers 36B are arranged. The retainer 36 </ b> B is configured by a leaf spring having a width corresponding to the sheet width, and is placed in pressure contact with the conveyance surface. The paper P conveyed on the feeder board 36 by the tape feeder 36A passes through the retainer 36B, so that the unevenness is corrected. The retainer 36 </ b> B is formed by curling the rear end portion so that the paper P can be easily introduced between the retainer 36 </ b> B and the feeder board 36.

  The roller 36C is disposed between the retainers 36B. The roller 36C is placed in pressure contact with the transport surface of the paper P. The sheet P conveyed between the front and rear retainers 36B is conveyed while the upper surface is suppressed by the rollers 36C.

  The front pad 38 corrects the posture of the paper P. The front pad 38 is formed in a plate shape and is disposed orthogonal to the transport direction of the paper P. Further, it is driven by a motor (not shown) so as to be swingable. The leading edge of the paper P conveyed on the feeder board 36 is brought into contact with the front pad 38, and the posture is corrected. Thereby, the skew of the paper P is prevented. The front pad 38 swings in conjunction with the paper feeding to the paper feeding drum 40 and delivers the paper P whose posture has been corrected to the paper feeding drum 40.

  The paper supply drum 40 receives the paper P fed from the feeder board 36 via the front pad 38 and conveys it to the processing liquid application unit 14. The paper supply drum 40 is formed in a cylindrical shape and is driven to rotate by a motor (not shown). A gripper 40A is provided on the outer peripheral surface of the paper feed drum 40, and the leading edge of the paper P is gripped by the gripper 40A. The paper feed drum 40 conveys the paper P to the processing liquid application unit 14 while winding the paper P around the peripheral surface by gripping and rotating the leading edge of the paper P with the gripper 40A.

  The paper feed unit 12 is configured as described above. With this configuration, the paper P stacked on the paper feed tray 30 is pulled up one by one in order from the top by the soccer device 32 and fed to the paper feed roller pair 34. The paper P fed to the paper feed roller pair 34 is fed forward by a pair of upper and lower rollers 34A and 34B constituting the paper feed roller pair 34 and placed on the feeder board 36. The paper P placed on the feeder board 36 is transported by a tape feeder 36 </ b> A provided on the transport surface of the feeder board 36. Then, the retainer 36B is pressed against the transport surface of the feeder board 36 in the transport process, and the unevenness is corrected. The sheet P conveyed by the feeder board 36 has its leading end brought into contact with the front pad 38 to correct the inclination, and is then transferred to the sheet feeding drum 40. Then, it is transported by the paper feed drum 40 to the processing liquid application unit 14.

<Processing liquid application part>
The processing liquid application unit 14 applies the processing liquid to the recording surface of the paper P. The treatment liquid application unit 14 mainly includes a treatment liquid application drum 42 that conveys the paper P, and a treatment liquid application unit 44 that applies the treatment liquid to the recording surface of the paper P conveyed by the treatment liquid application drum 42. Is done.

  The processing liquid application drum 42 receives the paper P from the paper supply drum 40 of the paper supply unit 12 and conveys the paper P to the processing liquid drying processing unit 16. The treatment liquid application drum 42 is formed in a cylindrical shape, and is rotated by being driven by a motor (not shown). A gripper 42A is provided on the outer peripheral surface of the treatment liquid applying drum 42, and the leading edge of the paper P is gripped by the gripper 42A. The treatment liquid application drum 42 conveys the paper P to the treatment liquid drying processing unit 16 while winding the paper P around the peripheral surface by gripping and rotating the leading edge of the paper P with the gripper 42A. The rotation of the processing liquid application drum 42 and the paper supply drum 40 is controlled so that the timing of receiving and delivering the paper P is matched. That is, it drives so that it may become the same peripheral speed, and it drives so that the position of a mutual gripper may match.

  The treatment liquid application unit 44 applies the treatment liquid to the recording surface of the paper P conveyed by the treatment liquid application drum 42 by a roller. The processing liquid application unit 44 mainly applies a coating roller 44A for applying the processing liquid to the paper P, a processing liquid tank 44B for storing the processing liquid, and a processing liquid stored in the processing liquid tank 44B. A pumping roller 44C to be supplied to the roller 44A. The pumping roller 44C is installed in pressure contact with the application roller 44A, and partly immersed in the processing liquid stored in the processing liquid tank 44B. The pumping roller 44C measures and pumps the processing liquid, and applies the processing liquid to the peripheral surface of the coating roller 44A with a certain thickness. The application roller 44A is provided corresponding to the paper width, is pressed against the paper P, and applies the treatment liquid applied to the peripheral surface thereof to the paper P. The application roller 44 </ b> A is driven by a contact / separation mechanism (not shown) and moves between a contact position that contacts the peripheral surface of the treatment liquid application drum 42 and a separation position that separates from the peripheral surface of the treatment liquid application drum 42. To do. The contact / separation mechanism moves the application roller 44A in accordance with the passage timing of the paper P, and applies the processing liquid to the recording surface of the paper P conveyed by the processing liquid application drum 42.

  In the present embodiment, the processing liquid is applied by roller application, but the method of applying the processing liquid is not limited to this. In addition, the structure provided using an inkjet head or the structure provided by spraying can also be employ | adopted.

  The treatment liquid application unit 14 is configured as described above. With this configuration, the paper P delivered from the paper supply drum 40 of the paper supply unit 12 is received by the processing liquid application drum 42. The treatment liquid applying drum 42 grips the leading end of the paper P with the gripper 42A and rotates, so that the paper P is wound around the circumferential surface and conveyed. During this conveyance process, the application roller 44A is pressed against the recording surface of the paper P, and the processing liquid is applied to the recording surface of the paper P.

  The processing liquid applied to the recording surface of the paper P has a function of aggregating the color material in the ink applied to the paper P by the image recording unit 18. By applying such a treatment liquid to the recording surface of the paper P and then applying ink, high-quality printing can be performed without causing landing interference or the like even when general-purpose printing paper is used. be able to.

<Processing liquid drying processing section>
The processing liquid drying processing unit 16 performs a drying process on the paper P with the processing liquid applied to the recording surface. The processing liquid drying processing unit 16 mainly blows hot air on the processing liquid drying processing drum 46 that transports the paper P, the paper transport guide 48, and the recording surface of the paper P that is transported by the processing liquid drying processing drum 46. And a processing liquid drying processing unit 50 for drying.

  The processing liquid drying processing drum 46 receives the paper P from the processing liquid application drum 42 of the processing liquid application unit 14 and conveys the paper P to the image recording unit 18. The treatment liquid drying treatment drum 46 is constituted by a frame assembled in a cylindrical shape, and is rotated by being driven by a motor (not shown). A gripper 46A is provided on the outer peripheral surface of the processing liquid drying processing drum 46, and the leading edge of the paper P is gripped by the gripper 46A. The processing liquid drying processing drum 46 conveys the paper P to the image recording unit 18 by gripping and rotating the leading edge of the paper P with the gripper 46A.

  The processing liquid drying processing drum 46 is configured such that grippers 46A are disposed at two locations on the outer peripheral surface, so that two sheets of paper P can be conveyed by one rotation. The rotation of the processing liquid drying processing drum 46 and the processing liquid application drum 42 is controlled so that the timing of receiving and transferring the paper P with each other is matched. That is, while driving so that it may become the same peripheral speed, it drives so that the position of mutual gripper 42A may match.

  The paper transport guide 48 is disposed along the transport path of the paper P by the processing liquid drying processing drum 46 and guides the transport of the paper P.

  The processing liquid drying processing unit 50 is installed inside the processing liquid drying processing drum 46 and performs drying processing by blowing hot air toward the recording surface of the paper P conveyed by the processing liquid drying processing drum 46. In the present embodiment, two processing liquid drying processing units 50 are disposed in the processing liquid drying processing drum, and hot air is blown toward the recording surface of the paper P conveyed by the processing liquid drying processing drum 46. Yes.

  The processing liquid drying processing unit 16 is configured as described above. With this configuration, the paper P delivered from the processing liquid application drum 42 of the processing liquid application unit 14 is received by the processing liquid drying processing drum 46. The processing liquid drying processing drum 46 conveys the paper P by gripping the leading end of the paper P with the gripper 46 </ b> A and rotating. At this time, the processing liquid drying processing drum 46 conveys the recording surface of the paper P inward. In the course of being conveyed by the processing liquid drying processing drum 46, the paper P is dried by blowing hot air from the processing liquid drying processing unit 50 installed inside the processing liquid drying processing drum 46 to the recording surface. That is, the solvent component in the treatment liquid is removed. Thereby, an ink aggregation layer is formed on the recording surface of the paper P.

<Image recording part>
The image recording unit 18 applies ink droplets of each color of C (cyan), M (magenta), Y (yellow), and K (black) to the recording surface of the paper P, and applies the recording surface of the paper P to the recording surface of the paper P. Record a color image. The image recording unit 18 mainly presses the image recording drum 52 that conveys the paper P and the paper P that is conveyed by the image recording drum 52, so that the paper P is brought into close contact with the peripheral surface of the image recording drum 52. A roller 54, inkjet heads 56C, 56M, 56Y, and 56K that eject ink droplets of C, M, Y, and K colors on the paper P; an inline sensor 58 that reads an image recorded on the paper P; and ink A mist filter 60 for capturing mist and a drum cooling unit 62 are included.

  The image recording drum 52 receives the paper P from the processing liquid drying processing drum 46 of the processing liquid drying processing unit 16 and conveys the paper P to the ink drying processing unit 20. The image recording drum 52 is formed in a cylindrical shape and is driven to rotate by a motor (not shown). A gripper 52A is provided on the outer peripheral surface of the image recording drum 52, and the leading edge of the paper P is gripped by the gripper 52A. The image recording drum 52 conveys the paper P to the ink drying processing unit 20 while winding the paper P around the peripheral surface by gripping and rotating the leading edge of the paper P with the gripper 52A. Further, the image recording drum 52 has a plurality of suction holes (not shown) formed on the peripheral surface thereof. The sheet P wound around the peripheral surface of the image recording drum 52 is conveyed while being sucked and held on the peripheral surface of the image recording drum 52 by being sucked from the suction holes. Thereby, the paper P can be conveyed with high flatness.

  The suction from the suction hole acts only within a certain range, for example, from the position where the paper pressing roller 54 is installed to the position where the paper is delivered to the ink drying processing unit 20. That is, the paper P is attracted and held on the peripheral surface of the image recording drum 52 at least at the image recording position where the inkjet heads 56C, 56M, 56Y and 56K are installed and the image reading position where the inline sensor 58 is installed. Is set as follows.

  The mechanism for attracting and holding the paper P on the peripheral surface of the image recording drum 52 is not limited to the above-described suction method using negative pressure, and a method using electrostatic suction can also be employed.

  Further, the image recording drum 52 is configured such that grippers 52A are disposed at two positions on the outer peripheral surface, and two sheets of paper P can be conveyed by one rotation. The rotation of the image recording drum 52 and the processing liquid drying processing drum 46 is controlled so that the timing of receiving and transferring the paper P is matched. That is, it drives so that it may become the same peripheral speed, and it drives so that the position of a mutual gripper may match.

  The sheet pressing roller 54 is disposed in the vicinity of the position where the image recording drum 52 receives the sheet P from the processing liquid drying processing drum 46. The sheet pressing roller 54 is composed of a rubber roller, and is installed in press contact with the peripheral surface of the image recording drum 52. The paper P transferred from the processing liquid drying processing drum 46 to the image recording drum 52 is nipped by passing through the paper pressing roller 54 and is brought into close contact with the peripheral surface of the image recording drum 52.

  The four inkjet heads 56C, 56M, 56Y, and 56K are arranged at a constant interval along the conveyance path of the paper P by the image recording drum 52. The inkjet heads 56 </ b> C, 56 </ b> M, 56 </ b> Y, and 56 </ b> K are constituted by line heads corresponding to the paper width, and are arranged so that the nozzle surface faces the peripheral surface of the image recording drum 52. Each of the ink jet heads 56C, 56M, 56Y, and 56K ejects ink droplets from the nozzle row formed on the nozzle surface toward the image recording drum 52, thereby conveying the paper P conveyed by the image recording drum 52. Record an image on

  As described above, water-based ink is used as the ink ejected from each of the inkjet heads 56C, 56M, 56Y, and 56K.

  The in-line sensor 58 is installed on the downstream side of the rearmost inkjet head 56K with respect to the conveyance direction of the paper P by the image recording drum 52, and reads the images recorded by the inkjet heads 56C, 56M, 56Y, and 56K. The in-line sensor 58 is constituted by a line scanner, for example, and reads images recorded by the inkjet heads 56C, 56M, 56Y, and 56K from the paper P conveyed by the image recording drum 52.

  Based on the imaging result of the inline sensor 58, an image defect detection unit (not shown) detects an image defect. Examples of the “image defect” herein include those caused by ejection abnormalities of the inkjet heads 56C, 56M, 56Y, and 56K, those caused by color misregistration, and those caused by adhesion of foreign matters such as ink mist.

  The image defect may be any abnormality on the paper P that can be grasped from the imaging result of the in-line sensor 58, and is not limited to the above-described ones such as ejection abnormality. In combination with the inline sensor 58 or in place of the inline sensor 58, a sensor for detecting the stain on the paper P may be provided.

  A contact prevention plate 59 is installed on the downstream side of the inline sensor 58 in the vicinity of the inline sensor 58. The contact prevention plate 59 prevents the paper P from coming into contact with the in-line sensor 58 when the paper P is lifted due to a conveyance failure or the like.

  The mist filter 60 is disposed between the rearmost inkjet head 56K and the in-line sensor 58, and sucks air around the image recording drum 52 to capture the ink mist. In this way, by sucking the air around the image recording drum 52 and capturing the ink mist, the ink mist can be prevented from entering the in-line sensor 58 and reading errors can be prevented.

  The drum cooling unit 62 cools the image recording drum 52 by blowing cold air onto the image recording drum 52. The drum cooling unit 62 is mainly composed of an air conditioner (not shown) and a duct 62 </ b> A for blowing cool air supplied from the air conditioner onto the peripheral surface of the image recording drum 52. The duct 62 </ b> A cools the image recording drum 52 by blowing cool air to an area other than the conveyance area of the paper P against the image recording drum 52. In the present embodiment, since the paper P is conveyed along the almost upper half arc surface of the image recording drum 52, the duct 62 </ b> A blows cold air onto the substantially lower half area of the image recording drum 52, and the image The recording drum 52 is cooled. Specifically, the air outlet of the duct 62 </ b> A is formed in an arc shape so as to cover substantially the lower half of the image recording drum 52, and cold air is blown to the region of the substantially lower half of the image recording drum 52. Has been.

  Here, the temperature for cooling the image recording drum 52 is determined by the relationship with the temperature of the nozzle surfaces of the inkjet heads 56C, 56M, 56Y, and 56K, and is lower than the temperature of the inkjet heads 56C, 56M, 56Y, and 56K. It is cooled to become. Thereby, it is possible to prevent condensation from occurring in the ink jet heads 56C, 56M, 56Y, and 56K. That is, by making the temperature of the image recording drum 52 lower than that of the inkjet heads 56C, 56M, 56Y, and 56K, condensation can be induced on the image recording drum side, and the inkjet heads 56C, 56M, 56Y, and 56K Condensation generated on the nozzle surface can be prevented.

  The image recording unit 18 is configured as described above. With this configuration, the paper P delivered from the processing liquid drying processing drum 46 of the processing liquid drying processing unit 16 is received by the image recording drum 52. The image recording drum 52 conveys the paper P by gripping the leading end of the paper P with the gripper 52A and rotating. The paper P delivered to the image recording drum 52 is first brought into close contact with the peripheral surface of the image recording drum 52 by passing through the paper pressing roller 54. At the same time, it is sucked from the suction holes of the image recording drum 52 and sucked and held on the outer peripheral surface of the image recording drum 52. The sheet P is transported in this state and passes through positions that face the inkjet heads 56C, 56M, 56Y, and 56K. During the passage, ink droplets of the respective colors C, M, Y, and K are applied to the recording surface from the ink jet heads 56C, 56M, 56Y, and 56K, and a color image is recorded on the recording surface. Since the ink aggregation layer is formed on the recording surface of the paper P, a high-quality image can be recorded without causing feathering and / or bleeding.

  The paper P on which an image is recorded by the ink jet heads 56C, 56M, 56Y, and 56K then passes through a position facing the inline sensor 58. And the image recorded on the recording surface at the time of the passage is read. This recorded image is read for all the papers P. When reading is performed, reading is performed in a state of being held by suction on the image recording drum 52, so that reading can be performed with high accuracy. Further, since reading is performed immediately after image recording, for example, an abnormality such as ejection failure can be immediately detected, and the response can be quickly performed. As a result, it is possible to prevent wasteful recording and minimize the occurrence of waste paper.

  Thereafter, the sheet P is transferred to the ink drying processing unit 20 after the suction is released.

<Ink drying processing section>
The ink drying processing unit 20 performs drying processing on the paper P after image recording, and removes the liquid component remaining on the recording surface of the paper P. The ink drying processing unit 20 is transported by the chain gripper 64 that transports the paper P on which an image is recorded, the back tension applying mechanism 66 that applies back tension to the paper P transported by the chain gripper 64, and the chain gripper 64. And an ink drying processing unit 68 for drying paper P.

  The chain gripper 64 is a paper transport mechanism commonly used in the ink drying processing unit 20 and the paper discharge unit 24, and receives the paper P delivered from the image recording unit 18 and transports it to the paper discharge unit 24. .

  The chain gripper 64 mainly includes a first sprocket 64A disposed in the vicinity of the image recording drum 52, a second sprocket 64B installed in the paper discharge unit 24, a first sprocket 64A, and a second sprocket 64B. The endless chain 64C is wound around, a plurality of chain guides (not shown) for guiding the running of the chain 64C, and a plurality of grippers 64D attached to the chain 64C with a constant interval.

  The first sprocket 64 </ b> A, the second sprocket 64 </ b> B, the chain 64 </ b> C, and the chain guide are each configured as a pair, and are disposed on both sides of the paper P in the width direction. A plurality of grippers 64 </ b> D are provided between the pair of chains 64 </ b> C, and both end portions of the leading end of the paper P are gripped by the plurality of grippers 64 </ b> D.

  The first sprocket 64A is installed close to the image recording drum 52 so that the paper P delivered from the image recording drum 52 can be received by the gripper 64D. The first sprocket 64A is rotatably supported by a bearing (not shown) and is connected to a motor (not shown). The chain 64C wound around the first sprocket 64A and the second sprocket 64B travels by driving this motor.

  The second sprocket 64B is installed in the paper discharge unit 24 so that the paper P received from the image recording drum 52 can be collected by the paper discharge unit 24. That is, the installation position of the second sprocket 64B is the end of the transport path of the paper P by the chain gripper 64. The second sprocket 64B is rotatably supported by being supported by a bearing (not shown).

  The chain 64C is endless, and is wound around the first sprocket 64A and the second sprocket 64B.

  The chain guide is appropriately disposed at a necessary position to guide the chain 64C so as to travel along a desired route. As a result, the paper P travels along the transport path and is transported. In the inkjet recording apparatus 10 of the present embodiment, the second sprocket 64B is disposed at a position higher than the first sprocket 64A. For this reason, a travel route in which the chain 64C is inclined in the middle is formed. Specifically, it includes a first horizontal transfer path 70A, an inclined transfer path 70B, and a second horizontal transfer path 70C.

  70 A of 1st horizontal conveyance paths are set to the same height as 1st sprocket 64A, and chain 64C wound around 1st sprocket 64A is set so that it may run horizontally.

  The second horizontal conveyance path 70C is set to the same height as the second sprocket 64B, and the chain 64C wound around the second sprocket 64B is set to travel horizontally.

  The inclined conveyance path 70B is set between the first horizontal conveyance path 70A and the second horizontal conveyance path 70C, and is set so as to connect the first horizontal conveyance path 70A and the second horizontal conveyance path 70C.

  The chain guide is disposed so as to form the first horizontal conveyance path 70A, the inclined conveyance path 70B, and the second horizontal conveyance path 70C. Specifically, it is disposed at at least a junction point between the first horizontal conveyance path 70A and the inclined conveyance path 70B and a junction point between the inclined conveyance path 70B and the second horizontal conveyance path 70C.

  A plurality of pairs of grippers 64D are attached to the chain 64C with a constant interval. The attachment interval of the gripper 64D is set in accordance with the reception interval of the paper P from the image recording drum 52. That is, the sheet P sequentially delivered from the image recording drum 52 is set in accordance with the reception interval of the sheet P from the image recording drum 52 so that the sheet P can be received from the image recording drum 52 at the same timing.

  The chain gripper 64 is configured as described above. With this configuration, when a motor (not shown) connected to the first sprocket 64A is driven as described above, the chain 64C travels. The chain 64C travels at the same speed as the peripheral speed of the image recording drum 52. The timing is adjusted so that the paper P delivered from the image recording drum 52 can be received by each gripper 64D.

  The back tension applying mechanism 66 applies a back tension to the paper P that is conveyed while its leading end is gripped by the chain gripper 64. The back tension applying mechanism 66 is mainly composed of a conveyance guide plate 72 and a suction pump 67.

  The conveyance guide plate 72 is a hollow box plate made of a thick body plate having a width corresponding to the paper width. The transport guide plate 72 is disposed along the transport path of the paper P by the chain gripper 64. Specifically, it is disposed along a chain 64C that travels along the first horizontal transport path 70A and the inclined transport path 70B, and is spaced apart from the chain 64C by a certain distance.

  The conveyance guide plate 72 supports the paper P with a planar guide surface 72a (see FIG. 2) on the upper surface. The sheet P conveyed by the chain gripper 64 moves while the surface opposite to the recording surface slides on the guide surface 72a.

  A large number of suction holes 72c (see FIG. 2) are formed in the guide surface 72a of the conveyance guide plate 72. As described above, the conveyance guide plate 72 is formed of a hollow box plate, and the suction pump 67 (an example of a suction force generation unit) sucks the hollow portion inside the conveyance guide plate 72. Thereby, air is sucked from the suction hole 72c formed in the guide surface 72a.

  When air is sucked from the suction hole 72c of the transport guide plate 72, the opposite surface of the recording surface of the paper P transported by the chain gripper 64 is sucked into the suction hole 72c. As a result, back tension is applied to the paper P conveyed by the chain gripper 64.

  As described above, since the transport guide plate 72 is disposed along the chain 64C that travels along the first horizontal transport path 70A, the back tension is applied to the paper P while it is transported along the first horizontal transport path 70A. Is granted.

  The ink drying processing unit 68 is installed in the chain gripper 64, particularly in a portion constituting the first horizontal transport path 70A, and performs a drying process on the paper P transported through the first horizontal transport path 70A.

  FIG. 2 is a diagram illustrating a configuration of the ink drying processing unit 20. As shown in the figure, the ink drying processing unit 68 includes an external air inlet 100, hot air circulation valves 102a and 102b, an intake blower 104, a hot air heater 106, a hot air chamber 108, an infrared heater 110, a temperature sensor 112a, 112b, jam sensors 114a and 114b, exhaust port 116, exhaust blower 118, external exhaust port 120, cover 122, cold liquid chiller 124, hot liquid chiller 126, and switching valves 128a and 128b. In addition, the ink drying processing unit 20 includes a cold liquid chiller 124 and a hot liquid chiller 126.

  The ink drying processing unit 20 is covered with a cover 122. In addition, the cover 122 is provided with an external air inlet 100 and an external air outlet 120 that communicate the inside and the outside of the inkjet recording apparatus 10.

  A hot air circulation valve 102a (an example of a first circulation valve) is provided in communication with the outside air intake 100, and a hot air circulation valve 102b (an example of a second circulation valve) is provided in communication with the outside air outlet 120. . Each of the hot air circulation valve 102a and the hot air circulation valve 102b is constituted by a three-way valve, and an intake blower 104 is connected to the hot air circulation valve 102a, and an exhaust blower 118 is connected to the hot air circulation valve 102b. Is provided. Further, the hot air circulation valve 102 a and the hot air circulation valve 102 b are communicated inside the cover 122.

  The intake blower 104 is a gas supply unit that sucks air (an example of gas) from the hot air circulation valve 102 a and supplies the air to the hot air heater 106. The hot air circulation valve 102a mixes the air that the intake blower 104 sucks from the outside air intake port 100 and the air that is sucked from the hot air circulation valve 102b. In a normal drying process, the hot air circulation valve 102a is adjusted so that the ratio of the air sucked from the outside air intake port 100 by the intake blower 104 and the air sucked from the hot air circulation valve 102b is 50%. Yes.

  The hot air heater 106 heats the air supplied from the intake blower 104 to a temperature higher than a safe temperature of 50 ° C. (an example of a first heater) and blows the heated air to the hot air chamber 108. And a fan unit 106b. The air blown by the hot air heater 106 is supplied to the hot air chamber 108.

  The warm air chamber 108 (an example of the air blowing unit) equalizes the air supplied from the warm air heater 106 and supplies it to the paper P conveyed along the conveyance guide plate 72, and dries the ink on the recording surface of the paper P. It is a warm air supply means. The hot air chamber 108 has a width equivalent to the conveyance guide plate 72 in a direction orthogonal to the conveyance direction of the paper P, and a surface facing the conveyance guide plate 72 is arranged in parallel with the conveyance guide plate 72. The hot air chamber 108 is formed in a hollow shape, and a plurality of air outlets 108 a (an example of gas air outlets) are provided at positions facing the conveyance guide plate 72. In the hot air chamber 108, the air supplied by the hot air heater 106 is press-fitted inside, and the air is blown out from the air outlet 108a. Thereby, warm air is blown against the recording surface of the paper P conveyed along the conveyance guide plate 72.

  The infrared heater 110 (an example of a second heater) is radiant heating means that dries ink on the recording surface of the paper P by irradiating the recording surface of the paper P transported along the transport guide plate 72 with infrared rays. . The infrared heater 110 is disposed between the hot air chamber 108 and the conveyance guide plate 72, avoiding the position of the air outlet 108 a of the hot air chamber 108. A ceramic heater or a halogen heater may be used instead of the infrared heater 110.

  The temperature sensors 112a and 112b are temperature measuring means. The temperature sensor 112 a is provided in the hot air chamber 108 and measures the temperature of the hot air chamber 108. On the other hand, the temperature sensor 112b is provided on the conveyance guide plate 72 and measures the temperature of the guide surface 72a.

  The jam sensors 114a and 114b (an example of a conveyance failure detection unit) are, for example, reflective optical sensors, and are disposed immediately before and immediately after the hot air chamber 108 in the conveyance path of the paper P, respectively. By detecting whether or not the paper P is transported by the jam sensors 114a and 114b, the jam of the paper P, which is a transport failure in the ink drying processing unit 20, that is, jam is detected.

  An exhaust port 116 is provided at a position adjacent to the conveyance guide plate 72 in a direction orthogonal to the conveyance direction of the paper P, and an exhaust blower 118 is provided in communication with the exhaust port 116. As described above, the hot air circulation valve 102 b communicates with the exhaust blower 118.

  Wet air is generated by the warm air blown from the warm air chamber 108 onto the recording surface of the paper P. The moist air is supplied from the exhaust port 116 to the hot air circulation valve 102b through the exhaust blower 118.

  The hot air circulation valve 102b communicates with the external air outlet 120 and the hot air circulation valve 102a. The hot air circulation valve 102b separates the air supplied from the exhaust blower 118 into air exhausted to the external exhaust port 120 and air supplied to the hot air circulation valve 102a. In a normal drying process, the hot air circulation valve 102b is adjusted so that the ratio of the air exhausted to the external exhaust port 120 and the air supplied to the hot air circulation valve 102a is 50%. Therefore, half of the air supplied from the exhaust blower 118 is exhausted to the external exhaust port 120, and the other half is supplied to the hot air heater 106 by the intake blower 104 via the hot air circulation valve 102a.

  Inside the conveyance guide plate 72, a temperature control flow path 72b (an example of piping) is provided.

  The cold liquid chiller 124 (an example of a low temperature liquid feeding unit) adjusts the temperature of the temperature adjustment liquid to a desired temperature, sends the adjusted temperature liquid to the temperature adjustment flow path 72b, and the temperature adjustment flow path 72b. It is a circulation cooling means which collects the temperature control liquid. Further, the warm liquid chiller 126 (an example of a liquid feeding unit, an example of a high temperature liquid feeding unit) adjusts the temperature of the temperature adjustment liquid to a desired temperature, and sends the temperature adjustment liquid adjusted in temperature to the temperature adjustment flow path 72b. This is a circulating heating means for recovering the temperature control liquid in the temperature control flow path 72b.

  The switching valves 128a and 128b are flow path switching means for selecting which of the temperature control liquid of the cold liquid chiller 124 and the temperature control liquid of the hot liquid chiller 126 is circulated to the temperature control flow path 72b. In the present embodiment, the switching valves 128a and 128b circulate the temperature adjustment liquid of the warm liquid chiller 126 to the temperature adjustment flow path 72b in a normal drying process.

  For the purpose of preventing the deformation of the paper P due to heating from the infrared heater 110 and promoting drying to shorten the drying time as much as possible, the hot liquid chiller 126 sets the temperature of the temperature control liquid to a safe temperature (first temperature). 1 example, second temperature example, third temperature example) is adjusted to 70 ° C., which is higher than 50 ° C. Therefore, when the switching valves 128a and 128b select the temperature adjustment liquid of the temperature liquid chiller 126, the temperature adjustment liquid of 70 ° C. circulates in the temperature adjustment flow path 72b. By transmitting this temperature to the guide surface 72a, the temperature of the guide surface 72a is adjusted to 70 ° C. Note that the temperature of the temperature adjusting liquid of the hot liquid chiller 126 may be appropriately changed according to the recording medium and ink.

  In the present embodiment, the cold liquid chiller 124 adjusts the temperature of the temperature adjustment liquid to 30 ° C., which is lower than the safe temperature. Therefore, when the switching valves 128a and 128b select the temperature adjustment liquid of the cold liquid chiller 124, the conveyance guide plate 72 is adjusted to 30 ° C. By transmitting this temperature to the guide surface 72a, the temperature of the guide surface 72a is adjusted to 30 ° C. In addition, the temperature of the temperature control liquid of the cold liquid chiller 124 is not limited to 30 ° C., and may be any temperature lower than the safe temperature.

  Returning to the description of FIG. 1, a plurality of ink drying processing units 68 are arranged along the first horizontal conveyance path 70A. This number of installations is set according to the processing capability of the ink drying processing unit 68 and / or the conveyance speed of the paper P, and the like. That is, the sheet P received from the image recording unit 18 is set so that it can be dried while being conveyed through the first horizontal conveyance path 70A. Therefore, the length of the first horizontal conveyance path 70A is also set in consideration of the capability of the ink drying processing unit 68.

  The ink drying processing unit 20 is configured as described above. With this configuration, the paper P delivered from the image recording drum 52 of the image recording unit 18 is received by the chain gripper 64. The chain gripper 64 conveys the paper P by gripping the leading end of the paper P with the gripper 64D. The paper P delivered to the chain gripper 64 is first transported along the first horizontal transport path 70A. In the process of being transported along the first horizontal transport path 70 </ b> A, the paper P is supported by the guide surface 72 a and dried by the ink drying processing unit 68 installed inside the chain gripper 64. That is, the recording surface of the paper P is irradiated with infrared rays and hot air is blown thereon to perform a drying process. Further, the opposite surface of the recording surface of the paper P is heated to 70 ° C. by the temperature-controlled guide surface 72a.

  At this time, the paper P is dried while the back tension is applied by the back tension applying mechanism 66. As a result, the drying process can be performed while suppressing deformation of the paper P.

  Thereafter, the sheet P is transported to the paper discharge unit 24 through the inclined transport path 70B and the second horizontal transport path 70C.

<Paper output section>
The paper discharge unit 24 collects the paper P on which a series of image recording processing has been performed. The paper discharge unit 24 mainly includes a chain gripper 64 that conveys the paper P and a paper discharge tray 76 that stacks and collects the paper P.

  The chain gripper 64 releases the paper P on the paper discharge tray 76 and stacks the paper P on the paper discharge tray 76.

  The paper discharge tray 76 stacks and collects the paper P released from the chain gripper 64. The paper discharge tray 76 is provided with a sheet pad (not shown) so that the sheets P are stacked in an orderly manner.

  The paper discharge tray 76 is provided so as to be lifted and lowered by a paper discharge tray lifting / lowering device (not shown). The discharge platform lifting device is controlled in conjunction with the increase / decrease of the paper P stacked on the paper discharge tray 76 so that the uppermost paper P is always positioned at a certain height. The paper table 76 is moved up and down.

[Cover lock mechanism of ink drying processing section]
FIG. 3 is a perspective view of the ink drying processing unit 20. As shown in the figure, the ink drying processing unit 20 is covered with a cover 122. The cover 122 includes an opening / closing cover 140 (an example of an opening / closing door) for exposing the inside of the ink drying processing unit 20, and the opening / closing cover 140 includes a rotation knob 142.

  The operator rotates the rotary knob 142 counterclockwise in FIG. 3 with the opening / closing cover 140 closed, and pulls the opening / closing cover 140 to the front side in FIG. The inside can be exposed. The operator can perform maintenance or the like of the ink drying processing unit 20 with the inside exposed.

  Further, with the open / close cover 140 being opened, the open / close cover 140 is pushed inward in FIG. 3, and the rotary knob 142 is rotated clockwise in FIG. The inside of the drying processing unit 20 can be shielded.

  4 and 5 are diagrams for describing a lock mechanism (an example of a lock unit) that prevents an operator from opening the open / close cover 140 when the open / close cover 140 is closed. 4 is a perspective view of the vicinity of the rotary knob 142 in a state where the opening / closing cover 140 is closed, as viewed from the side, and FIG. 5 is a partial view of the arrow A in FIG.

  As shown in FIG. 4, the rotary knob 142 is provided with a lock plate 144 that rotates as the rotary knob 142 rotates. When the opening / closing cover 140 is closed, the lock plate 144 is disposed in the direction shown in FIG. 5B and is engaged with the slit 140 a of the opening / closing cover 140. Thereby, the opening / closing cover 140 is maintained in a closed state.

  When the operator rotates the rotary knob 142 counterclockwise with the open / close cover 140 closed, the lock plate 144 also rotates as the rotary knob 142 rotates. Thereby, the lock plate 144 is oriented as shown in FIG. 5C, and the engagement between the lock plate 144 and the slit 140a is released. Therefore, the inside of the ink drying processing unit 20 can be exposed by moving the open / close cover 140 to the left in FIG.

  On the other hand, when the opening / closing cover 140 is opened, the opening / closing cover 140 is changed to a vertical state and the rotation knob 142 is rotated clockwise, so that the lock plate 144 is again in the direction shown in FIG. 144 and the slit 140a of the opening / closing cover 140 are engaged with each other. Thereby, the open / close cover 140 is kept closed, and the inside of the ink drying processing unit 20 is shielded.

  Further, the lock plate 144 is provided with a lock hole 144a. When the lock plate 144 is arranged in the direction shown in FIG. 5B, the lock arm 146 is arranged to be engageable with the lock hole 144a. Yes. Further, the lock arm 146 is configured to be movable in the left-right direction in FIG. 4 by a solenoid 148.

  As shown in FIG. 4, when the lock arm 146 is moved leftward by the solenoid 148 until it engages with the lock hole 144a, the rotation of the rotary knob 142 by the operator is blocked by this engagement. That is, the opening / closing cover 140 is locked, and the inside of the ink drying processing unit 20 is prohibited from being exposed.

  On the other hand, if the lock arm 146 is moved rightward by the solenoid 148 until the engagement with the lock hole 144a is released, the rotation of the rotary knob 142 by the operator is permitted. That is, the lock state of the opening / closing cover 140 is released, and the inside of the ink drying processing unit 20 is permitted to be exposed.

[Control system of inkjet recording apparatus]
FIG. 6 is a block diagram showing a schematic configuration of a control system of the inkjet recording apparatus 10 of the present embodiment. As shown in the figure, the inkjet recording apparatus 10 includes a system controller 200, a communication unit 202, an image memory 204, a conveyance control unit 210, a paper feed control unit 212, a processing liquid application control unit 214, a processing liquid drying control unit 216, An image recording control unit 218, an ink drying control unit 220, a paper discharge control unit 224, an operation unit 230, a display unit 232, and the like are provided.

  The system controller 200 functions as a control unit that performs overall control of each unit of the inkjet recording apparatus 10 and also functions as a calculation unit that performs various calculation processes. The system controller 200 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like (not shown) and operates according to a control program. The ROM stores a control program executed by the system controller 200 and various data necessary for control.

  The communication unit 202 includes a required communication interface, and transmits / receives data to / from a host computer connected to the communication interface.

  The image memory 204 functions as a temporary storage unit for various data including image data, and data is read and written through the system controller 200. Image data captured from the host computer via the communication unit 202 is stored in the image memory 204.

  The conveyance control unit 210 controls the conveyance unit 11 for the paper P in the inkjet recording apparatus 10. That is, the tape feeder 36A, the front pad 38, and the paper feed drum 40 in the paper feed unit 12 are controlled to be driven, and the treatment liquid application drum 42 in the treatment liquid application unit 14 and the treatment liquid drying treatment drum in the treatment liquid drying processor 16 are controlled. 46, controls the drive of the image recording drum 52 in the image recording unit 18. In addition, it controls the driving of the chain gripper 64 and the back tension applying mechanism 66 that are commonly used in the ink drying processing unit 20 and the paper discharge unit 24.

  The conveyance control unit 210 controls the conveyance unit 11 in accordance with a command from the system controller 200 so that the paper P is conveyed from the paper supply unit 12 to the paper discharge unit 24 without delay.

  In addition, the conveyance control unit 210 includes a pump control unit 240. The pump control unit 240 controls the suction pump 67 and adjusts the suction force for sucking the paper P from the suction hole 72 c of the transport guide plate 72 in the back tension applying mechanism 66.

  The paper feed control unit 212 controls the paper feed unit 12 in accordance with a command from the system controller 200. More specifically, the driving of the soccer device 32 and the paper feed table raising / lowering mechanism is controlled so that the sheets P stacked on the paper feed table 30 are sequentially fed one by one without overlapping.

  The processing liquid application control unit 214 controls the processing liquid application unit 14 in accordance with a command from the system controller 200. Specifically, the drive of the treatment liquid application unit 44 is controlled so that the treatment liquid is applied to the paper P conveyed by the treatment liquid application drum 42.

  The processing liquid drying control unit 216 controls the processing liquid drying processing unit 16 in accordance with a command from the system controller 200. Specifically, the drive of the processing liquid drying processing unit 50 is controlled so that the paper P conveyed by the processing liquid drying processing drum 46 is dried.

  The image recording control unit 218 controls the image recording unit 18 in accordance with a command from the system controller 200. Specifically, the drive of the inkjet heads 56C, 56M, 56Y, and 56K is controlled so that a desired image is recorded on the paper P conveyed by the image recording drum 52. Further, the operation of the inline sensor 58 is controlled so that the recorded image is read.

  The ink drying control unit 220 controls each unit of the ink drying processing unit 20 so as to dry the paper P conveyed by the chain gripper 64 in accordance with a command from the system controller 200.

  The ink drying control unit 220 includes a hot air circulation valve control unit 242, a blower control unit 244, a hot air heater control unit 246, an infrared heater control unit 248, a chiller control unit 250, a switching valve control unit 252 and a cover lock control unit 254. It has.

  The hot air circulation valve control unit 242 controls the hot air circulation valves 102 a and 102 b to adjust the ratio of air that circulates inside the cover 122.

  The blower control unit 244 controls the air volume of the intake blower 104 and the exhaust blower 118. The intake blower 104 and the exhaust blower 118 can change the rotational speed of a motor (not shown) by inverter control. Thereby, the rotation speed per unit time can be changed and the air volume can be controlled.

  The hot air heater control unit 246 controls the operation of the heater unit 106a and the fan unit 106b of the hot air heater 106. Further, the infrared heater control unit 248 controls the operation of the infrared heater 110.

  The chiller control unit 250 controls operations of the cold liquid chiller 124 and the hot liquid chiller 126.

  The switching valve control unit 252 controls the switching valves 128a and 128b to circulate the temperature adjustment liquid of the cold liquid chiller 124 or to circulate the temperature adjustment liquid of the hot liquid chiller 126 in the temperature adjustment flow path 72b. Select. The temperature of the liquid flowing through the temperature control channel 72b is transmitted to the guide surface 72a. Therefore, the temperature of the guide surface 72a can be adjusted by selecting the temperature control liquid.

  The cover lock control unit 254 switches the presence / absence of locking of the opening / closing cover 140 by controlling the solenoid 148.

  Outputs from the temperature sensors 112 a and 112 b and the jam sensors 114 a and 114 b provided in the ink drying processing unit 20 are input to the system controller 200. The system controller 200 outputs a command to the ink drying control unit 220 based on the output results of the temperature sensors 112a and 112b and the jam sensors 114a and 114b.

  The paper discharge control unit 224 controls the paper discharge unit 24 in accordance with a command from the system controller 200. More specifically, the driving of the paper discharge table lifting mechanism is controlled so that the paper P is stacked on the paper discharge table 76.

  The operation unit 230 and the display unit 232 are integrally configured by a touch panel. The operation unit 230 outputs operation information input from the touch panel to the system controller 200. The system controller 200 executes various processes in accordance with the operation information input from the operation unit 230. In addition, the display unit 232 displays necessary information on the touch panel in accordance with a command from the system controller 200.

[Operation of inkjet recording apparatus]
FIG. 7 is a flowchart showing the process of the image forming method in the inkjet recording apparatus 10.

  First, in step S2, the operator uses the operation unit 230 to set a print image and / or the number of prints. Image data to be recorded on the paper P is taken into the inkjet recording apparatus 10 from the host computer via the communication unit 202. The captured image data is stored in the image memory 204.

  Subsequently, in step S4, printing is performed based on the setting in step S2.

  The system controller 200 performs signal processing on the image data stored in the image memory 204 to generate dot data. The paper P supplied from the paper supply unit 12 is applied with treatment liquid and dried, and then transported to the image recording unit 18, and ink is applied by the inkjet heads 56C, 56M, 56Y, and 56K according to the generated dot data. Then, an image represented by the image data is recorded (an example of an image recording process). The paper P on which the image is recorded is delivered to the ink drying processing unit 20.

  The pump control unit 240 of the transport control unit 210 sets the suction force for sucking the paper P from the suction hole 72c of the transport guide plate 72 to the first suction force. The first suction force is a suction force that can appropriately convey the paper P by the chain gripper 64.

  The hot air circulation valve control unit 242 of the ink drying control unit 220 controls the hot air circulation valve 102a, and the air that the intake blower 104 sucks from the outside air intake port 100 and the air that is sucked from the hot air circulation valve 102b. The ratio is 50% each. Further, the hot air circulation valve controller 242 controls the hot air circulation valve 102b, and the ratio of the air exhausted from the exhaust outlet 120 of the exhaust blower 118 and the air supplied to the hot air circulation valve 102a by 50%. And As a result, 50% of the air is circulated inside the cover 122 and the remaining 50% of the air is exchanged with air outside the cover 122. In addition, the ratio of the air by the warm air circulation valve 102a and the warm air circulation valve 102b is not limited to 50%, and can be appropriately set to an appropriate value.

  The blower control unit 244 sets the air volume of the intake blower 104 to the first air volume and the air volume of the exhaust blower 118 to the second air volume. These air volumes are such that the paper P conveyed by the chain gripper 64 by the circulated air does not flutter or the like due to the circulated air.

  The hot air heater control unit 246 operates the heater unit 106a and the fan unit 106b of the hot air heater 106, and pressurizes the air heated to a temperature higher than 50 ° C., which is a safe temperature, into the hot air chamber 108. Thereby, the air heated by the warm air heater 106 blows out from the outlet 108a of the warm air chamber 108 (an example of an air blowing process). The infrared heater control unit 248 operates the infrared heater 110 to heat the ink on the paper P.

  The chiller control unit 250 stops the cold liquid chiller 124 and operates the hot liquid chiller 126. The switching valve control unit 252 controls the switching valves 128a and 128b to circulate the temperature adjustment liquid of the warm liquid chiller 126 through the temperature adjustment flow path 72b. By transmitting the temperature of the temperature control liquid to the guide surface 72a, the temperature of the guide surface 72a is maintained at 70 ° C., which is higher than the safe temperature.

  The ink drying processing unit 20 transports the paper P after image recording by the chain gripper 64 (an example of a transporting process), and is irradiated from the infrared heater 110 and heated air that is blown from the air outlet 108 a of the hot air chamber 108. The recording surface of the paper P is heated by infrared rays, and the ink on the recording surface of the paper P is dried. Furthermore, the conveyance guide plate 72 heats the opposite surface of the recording surface of the paper P at a temperature higher than the safe temperature, thereby promoting the drying of the ink on the recording surface of the paper P.

  As the ink drying processing unit 20 dries the paper P, the internal temperature rises. When the measured temperature of the temperature sensor 112b exceeds the safe temperature, the cover lock control unit 254 controls the solenoid 148 to bring the open / close cover 140 into a locked state. It should be noted that the portions other than the ink drying processing unit 20 of the inkjet recording apparatus 10 are not locked and the operator can freely access them.

  In step S6, it is determined whether printing has been completed for the number of prints set in step S2. If completed, the process of this flowchart ends.

  If printing of the number of prints set in step S2 has not been completed, it is determined in step S8 whether or not a jam has occurred in the conveyance of the paper P in the ink drying processing unit 20 (in the conveyance defect detection step). One case).

  The detection results of the jam sensors 114a and 114b are input to the system controller 200. When the paper P detected by the jam sensor 114a is not detected by the jam sensor 114b after a predetermined time, the system controller 200 determines that the paper P is clogged in the ink drying processing unit 20. If no jam has occurred, the process returns to step S4 and printing is continued. If a jam has occurred, the process proceeds to step S10.

  In step S <b> 10, the conveyance control unit 210 stops conveyance of the paper P. That is, the tape feeder 36A, the front pad 38, the paper feed drum 40, the processing liquid application drum 42 in the processing liquid application unit 14, the processing liquid drying processing drum 46 in the processing liquid drying processing unit 16, and the image recording unit 18 in the paper supply unit 12. The drive of the image recording drum 52 and the chain gripper 64 is stopped.

  After stopping the conveyance of the paper P, the hot air heater control unit 246 and the infrared heater control unit 248 stop the heater unit 106a and the infrared heater 110 of the hot air heater 106 in response to a command from the system controller 200 in step S12. Then, heating of the recording surface side of the paper P is stopped. In addition, the fan part 106b of the warm air heater 106 continues blowing.

  After stopping the heating of the recording surface side of the paper P, the chiller control unit 250 stops the hot liquid chiller 126 and operates the cold liquid chiller 124 in step S14. Further, the switching valve control unit 252 controls the switching valves 128a and 128b to circulate the temperature adjustment liquid of the cold liquid chiller 124 through the temperature adjustment flow path 72b. By transmitting the temperature of the temperature control liquid to the guide surface 72a, the temperature of the guide surface 72a is cooled to 30 ° C., which is lower than the safe temperature.

  Subsequently, in step S16, the hot air circulation valve control unit 242 controls the hot air circulation valve 102a so that the air that the intake blower 104 sucks from the external intake port 100 is 100% (intake from the external intake port). And the hot air circulation valve 102b is controlled so that the air exhausted by the exhaust blower 118 to the external exhaust port 120 is 100% (the ratio of the gas discharged from the external exhaust port is set to 100%). An example to increase). As a result, the circulating air inside the cover 122 is made 100% fresh from outside the machine, and the members such as the heater section 106a, the infrared heater 110, and the guide surface 72a of the warm air heater 106 are cooled by all fresh air. To do. In addition, the ratio of the air by the warm air circulation valve 102a and the warm air circulation valve 102b at the time of jam detection is not limited to 100%, and can be appropriately set to an appropriate value.

  In step S18, the pump control unit 240 of the transport control unit 210 sets the suction force for sucking the paper P from the suction hole 72c of the transport guide plate 72 to a suction force stronger than the first suction force. This suction force is, for example, the maximum suction force of the suction pump 67.

  Further, in step S20, the blower control unit 244 increases the number of revolutions per unit time of the intake blower 104 and sets the air volume of the intake blower 104 to be larger than the first air volume. Further, the rotational speed per unit time of the exhaust blower 118 is increased, and the air volume of the exhaust blower 118 is set to be larger than the second air volume. These airflows are the maximum airflows at which the paper P does not flutter with the suction force set in step S18. As described above, since the suction force of the conveyance guide plate 72 to the paper P is increased, the air volume of the intake blower 104 and the exhaust blower 118 can be increased. Thereby, more fresh air can be taken in and members, such as the heater part 106a of the warm air heater 106, the infrared heater 110, and the guide surface 72a, can be cooled.

  Next, in step S22, the system controller 200 displays on the display unit 232 that a jam has occurred.

  FIG. 8 is a diagram illustrating an example of the display content of the display unit 232 in step S14. As shown in the figure, a warning 300 is displayed at the top of the display unit 232. The warning 300 indicates that a jam has occurred (an example of a conveyance failure), that the ink drying processing unit 20 is being cooled, and that the open / close cover 140 is locked. included. The background of the warning 300 is red so as to stand out from the operator.

  A perspective view 302 of the ink drying processing unit 20 of the inkjet recording apparatus 10 is displayed at the center of the display unit 232. In the perspective view 302, names of main members accessible by the operator are described.

  Further, the temperature 304 of the ink drying processing unit 20 is displayed below the display unit 232. The temperature 304 is a display of the measurement result of the temperature sensor 112b (an example of the temperature inside the cover). When the measurement result exceeds the safe temperature, the background is red so that it is conspicuous to the operator. It becomes.

  Note that the background color of the warning 300 and the temperature 304 is not limited to red. Further, the order of the processes of Step S10 to Step S22 (an example of a control process) is not limited to the order of the present embodiment, and may be determined as appropriate according to the priority order.

  After displaying that a jam has occurred, the system controller 200 determines in step S24 whether or not the inside of the cover 122 has reached a safe temperature of 50 ° C. or lower by the processing of S12 to S20. Here, the determination is made based on the measurement result of the temperature sensor 112b. The temperature of the hot air chamber 108 decreases in a short time due to the heater unit 106a of the hot air heater 106 and the infrared heater 110 being stopped. On the other hand, since the conveyance guide plate 72 is composed of a thick body plate, the heat guide plate 72 has a large heat capacity and is less likely to lower the temperature than the hot air chamber 108. Therefore, the measurement result of the temperature sensor 112b provided on the conveyance guide plate 72 is used.

  If it is higher than the safe temperature, the process of step S24 is repeated. If the temperature falls below the safe temperature, the process proceeds to step S26.

  In step S26, the blower control unit 244 stops the intake blower 104 and the exhaust blower 118, and the chiller control unit 250 stops the cold liquid chiller 124. Further, the cover lock control unit 254 controls the solenoid 148 to release the lock state of the open / close cover 140.

  Subsequently, in step S28, the system controller 200 displays on the display unit 232 a method for removing the paper P that has jammed on the display unit 232.

  FIG. 9 is a diagram illustrating an example of display contents of the display unit 232 in step S28. As shown in the figure, a warning 306 is displayed at the top of the display unit 232. The warning 306 indicates that a jam has occurred, that the cooling of the ink drying processing unit 20 has been completed, that the opening / closing cover 140 has been unlocked, a method for removing the jammed paper P, and a post-removal method Contains the contents of the operation instructions. The warning 306 has a yellow background so that it is conspicuous to the operator because the ink drying processing unit 20 has finished cooling but a jam has occurred.

  Further, a perspective view 308 of the ink drying processing unit 20 of the inkjet recording apparatus 10 is displayed at the center of the display unit 232. In the perspective view 308, names of main members accessible by the operator are described. A display such as a color change may be performed on the location and / or name to be worked on to remove the jammed paper P.

  Further, the temperature 310 of the ink drying processing unit 20 is displayed below the display unit 232. The temperature 310 is a display of the measurement result of the temperature sensor 112b. When the measurement result is below the safe temperature, the background is blue.

  In accordance with the display on the display unit 232, in step S30, the operator opens the opening / closing cover 140 to expose the inside of the ink drying processing unit 20, and removes the paper P on which the jam has occurred. Thereafter, the opening / closing cover 140 is closed again. Furthermore, an error of the ink jet recording apparatus 10 can be canceled and returned by pressing a return button (not shown).

  As shown in FIG. 9, a menu button 312 having options of “resume printing”, “print reset”, and “cancel printing” is displayed on the lower right side of the display unit 232. After the operator removes the paper P and closes the open / close cover 140, the operator selects one of the three options of the menu button 312.

  Here, when “resume printing” is selected, a Y determination is made in step S32, the process proceeds to step S4, and printing is resumed. When “print reset” is selected, a Y determination is made in step S34, and the process proceeds to step S2 to enable print reset. If “cancel printing” is selected, Y is determined in step S 36, and the printing process ends.

  Until any menu is selected, the processes in steps S32 to S36 are repeated.

  The conveyance guide plate 72 has a large heat capacity, and it takes 30 minutes or more to reach a safe temperature of 50 ° C. or less only by blowing air from the hot air chamber 108. However, according to the present embodiment, the temperature controlled liquid at 30 ° C. of the cold liquid chiller 124 is sent to the temperature adjusting flow path 72b, so that the temperature can be reduced to a safe temperature or less within 1 minute. Thus, according to the present embodiment, the inside of the ink drying processing unit 20 can be cooled in a short time.

  Further, since the opening / closing cover 140 is locked until the temperature of the guide surface 72a of the conveyance guide plate 72 is equal to or lower than the safe temperature, the inside of the ink drying processing unit 20 is prevented from being exposed. It is possible to prevent the person from being burned and to remove the paper P safely.

<Second Embodiment>
FIG. 10 is a diagram illustrating a configuration of the ink drying processing unit 20 according to the second embodiment. In addition, the same code | symbol is attached | subjected to the part which is common in FIG. 2, and the detailed description is abbreviate | omitted. The ink drying processing unit 20 according to the present embodiment includes a belt conveyance type conveyance unit.

  As shown in FIG. 10, the ink drying processing unit 20 includes a first roller 150, a second roller 152, and a conveyance belt 154. The conveyor belt 154 is endless and is wound around the first roller 150 and the second roller 152. A motor (not shown) is connected to the second roller 152 as a drive source. By rotating the motor, the second roller 152 rotates counterclockwise in FIG. 10, and the conveyance belt 154 travels with this rotation. As a result, the paper P placed on the transport belt 154 is transported in the left transport direction in FIG.

  Further, the transport belt 154 travels while sliding on the guide surface 72 a of the transport guide plate 72. Therefore, the temperature of the liquid flowing through the temperature adjustment flow path 72b is transmitted to the transport belt 154 via the guide surface 72a.

  Furthermore, the suction belt 154 is provided with a number of suction holes (not shown). When the suction pump 67 sucks the hollow portion inside the transport guide plate 72, air is sucked from the suction holes of the transport belt 154 through the suction holes 72c formed in the guide surface 72a. Therefore, the paper P placed on the transport belt 154 can be held on the transport belt 154.

  As described above, the ink drying processing unit 20 according to the present embodiment has an endless belt wound around two rollers as a guide unit, holds a sheet with the surface of the endless belt as a guide surface, The paper is conveyed by rotating and running the endless belt.

  Also in this embodiment, by performing the same processing as the flowchart shown in FIG. 7, the inside of the ink drying processing unit 20 can be cooled in a short time, and the jammed paper P can be removed safely. be able to.

[Others]
Here, the temperature of the conveyance guide plate 72 is controlled by selecting one of the temperature adjustment liquid of the hot liquid chiller and the temperature adjustment liquid of the cold liquid chiller as the liquid flowing through the temperature adjustment flow path 72b of the conveyance guide plate 72. However, a warm liquid flow path for flowing the temperature adjustment liquid of the warm liquid chiller and a cold liquid flow path for flowing the temperature adjustment liquid of the cold liquid chiller are provided on the conveyance guide plate 72, respectively, and the temperature adjustment liquid is flowed to one of the flow paths. Thus, the temperature of the conveyance guide plate 72 may be controlled. Further, the conveyance guide plate 72 may control the temperature using a Peltier element or the like using the Seebeck effect.

  The cover lock control unit 254 controls the solenoid 148 to lock the open / close cover 140 when the measurement result of the temperature sensor 112b is higher than the safe temperature, and sets the solenoid 148 when the measurement result of the temperature sensor 112b is equal to or lower than the safe temperature. Although the lock state of the open / close cover 140 is released by control, hysteresis may be provided for the lock temperature and the release temperature. For example, the lock state may be set when the temperature rises to 55 ° C. or higher, and the lock state may be released after cooling to 50 ° C. or lower.

  The image forming method according to the present embodiment is configured as a program for causing a computer to execute each of the above steps, and is a non-temporary recording such as a CD-ROM (Compact Disk-Read Only Memory) that stores the configured program. It is also possible to configure the medium.

  The technical scope of the present invention is not limited to the scope described in the above embodiment. The configurations and the like in the embodiments can be appropriately combined between the embodiments without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Inkjet recording device 11 Conveyance part 12 Paper feed part 14 Processing liquid application part 16 Processing liquid drying process part 18 Image recording part 20 Ink drying process part 24 Paper discharge part 30 Paper feed base 32 Soccer device 32A Suction foot 34 Paper feed roller pair 34A Roller 34B Roller 36 Feeder board 36A Tape feeder 36B Retainer 36C Roller 38 Front pad 40 Feed drum 40A Gripper 42 Processing liquid application drum 42A Gripper 44 Processing liquid application unit 44A Coating roller 44B Processing liquid tank 44C Pumping roller 46 Processing liquid drying process Drum 46A Gripper 48 Paper transport guide 50 Processing liquid drying processing unit 52 Image recording drum 52A Gripper 54 Paper pressing roller 56C Inkjet head 56K Inkjet head 56M Inkjet head 56Y Kudget head 58 In-line sensor 59 Contact prevention plate 60 Mist filter 62 Drum cooling unit 62A Duct 64 Chain gripper 64A First sprocket 64B Second sprocket 64C Chain 64D Gripper 66 Back tension applying mechanism 67 Suction pump 68 Ink drying processing unit 70A First horizontal Conveying path 70B Inclined conveying path 70C Second horizontal conveying path 72 Conveying guide plate 72a Guide surface 72b Temperature control channel 72c Suction hole 76 Discharging stand 100 Outboard air inlet 102a Hot air circulation valve 102b Hot air circulation valve 104 Intake blower 106 Hot air heater 106a Heater section 106b Fan section 108 Hot air chamber 108a Outlet 110 Infrared heater 112a Temperature sensor 112b Temperature sensor 114a Jam sensor 114b Jam sensor 16 Exhaust port 118 Exhaust blower 120 External exhaust port 122 Cover 124 Cold liquid chiller 126 Hot liquid chiller 128a Switching valve 128b Switching valve 140 Opening / closing cover 140a Slit 142 Rotating knob 144 Lock plate 144a Lock hole 146 Lock arm 148 Solenoid 150 First roller 152 Second roller 154 Conveying belt 200 System controller 202 Communication unit 204 Image memory 210 Conveying control unit 212 Paper feed control unit 214 Processing liquid application control unit 216 Processing liquid drying control unit 218 Image recording control unit 220 Ink drying control unit 224 Control unit 230 Operation unit 232 Display unit 240 Pump control unit 242 Hot air circulation valve control unit 244 Blower control unit 246 Hot air heater control unit 248 Infrared heater control unit 250 Chiller control unit 252 Switching valve Control unit 254 cover lock controller 300 alerts 302 perspective view 304 Temperature 306 Warning 308 perspective view 310 Temperature 312 menu buttons P paper S2~S36 image forming method

Claims (13)

An image recording unit for recording an image by applying ink to a recording surface of a recording medium;
A guide unit for supporting a recording medium having an image recorded on the recording surface with a guide surface having a temperature higher than the first temperature;
A transport unit that transports the recording medium supported by the guide surface along a transport path;
A gas blower is disposed opposite the guide surface, and a blower that blows a gas having a temperature higher than the second temperature from the gas blower to dry the ink;
A conveyance failure detection unit that detects conveyance failure of the recording medium in the conveyance unit;
When the conveyance failure is detected, conveyance of the recording medium by the conveyance unit is stopped, the temperature of the guide surface is made lower than the first temperature, and the temperature of the gas blown from the gas outlet is set to the second temperature. A control unit for lowering the temperature,
An image forming apparatus. A liquid feeding section for feeding a liquid having a temperature higher than the first temperature;
A pipe which is provided in the guide portion and through which the liquid is fed;
With
The image forming apparatus according to claim 1, wherein when the conveyance failure is detected, the control unit sends a liquid having a temperature lower than the first temperature to the pipe. The liquid feeding part is
A high-temperature liquid feeding section for feeding a liquid having a temperature higher than the first temperature;
A low-temperature liquid feeding section for feeding a liquid having a temperature lower than the first temperature;
With
The image forming apparatus according to claim 2, wherein the control unit includes a valve that switches between liquid feeding by the high temperature liquid feeding unit and liquid feeding by the low temperature liquid feeding unit with respect to the pipe. The blowing section is
A first heater for heating the gas;
A fan for blowing the heated gas;
With
4. The image forming apparatus according to claim 1, wherein when the conveyance failure is detected, the control unit stops heating by the first heater and continues air blowing by the fan. 5. A cover covering at least the guide part and the air blowing part;
An external air inlet and an external air outlet that are provided in the cover and communicate between the outside and the inside of the cover;
An intake blower that draws gas from the external air intake and supplies it to the blower,
An exhaust blower that sucks the gas supplied toward the guide surface by the blower and discharges the gas to the external exhaust port;
A first circulation valve and a second circulation valve each composed of a three-way valve, wherein the external air inlet, the intake blower, the first circulation valve communicating with the second circulation valve, the exhaust blower, An external exhaust port, and a second circulation valve communicating with the first circulation valve;
With
The first circulation valve mixes the gas sucked from the outside air intake port and the gas sucked from the second circulation valve, and sucks it with a first air volume by the intake blower,
The second circulation valve separates the gas discharged from the exhaust blower with the second air volume into a gas discharged from the external exhaust port and a gas supplied to the first circulation valve,
When the conveyance failure is detected, the control unit increases the ratio of gas sucked from the external intake port in the first circulation valve, and discharges from the external exhaust port in the second circulation valve. The image forming apparatus according to claim 1, wherein the gas ratio is increased.   6. The image forming apparatus according to claim 5, wherein when the conveyance failure is detected, the control unit sets the intake blower to an air volume larger than the first air volume and sets the exhaust blower to an air volume larger than the second air volume. . A suction force generating unit that sucks the recording medium supported by the guide surface onto the guide surface with a first suction force;
The image forming apparatus according to claim 6, wherein when the conveyance failure is detected, the control unit makes the suction force generated by the suction force generation unit larger than the first suction force. A temperature sensor for measuring the temperature inside the cover;
An open / close door provided in the cover;
A lock portion for locking the open / close door;
With
The image forming apparatus according to claim 5, wherein the control unit locks the opening / closing door by the locking unit when a measurement result of the temperature sensor is higher than a third temperature. With a display,
When the conveyance failure is detected, the control unit displays on the display unit that the conveyance failure has occurred, the inside of the apparatus is at a high temperature, and the door is locked. Item 9. The image forming apparatus according to Item 8. A second heater that is disposed opposite the guide surface and that heats the conveyed recording medium;
The image forming apparatus according to claim 1, wherein the control unit stops heating by the second heater when the conveyance failure is detected.   The image forming apparatus according to claim 1, wherein the transport unit grips a leading end of the recording medium with a gripper and transports the recording medium by running the gripper.   The said conveyance part has a belt as the said guide part, supports the said recording medium by making the surface of the said belt into the said guide surface, and conveys the said recording medium by making the said belt run. The image forming apparatus according to claim 1. An image recording step of recording an image by applying ink to a recording surface of a recording medium;
A conveying step of supporting a recording medium having an image recorded on the recording surface with a guide surface having a temperature higher than the first temperature of the guide unit, and conveying the recording medium supported by the guide surface along a conveying path;
A blowing step of drying the ink by blowing a gas having a temperature higher than the second temperature from the gas blowing port of the blowing unit in which the gas blowing port is disposed facing the guide surface;
A conveyance failure detection step of detecting a conveyance failure of the recording medium in the conveyance step;
When the conveyance failure is detected, the conveyance of the recording medium in the conveyance process is stopped, the temperature of the guide surface is made lower than the first temperature, and the temperature of the gas blown from the gas outlet is set to the second temperature. A control process for lowering the temperature,
An image forming method.