JP2019162767A - Dryer and image forming device - Google Patents

Abstract

To provide a dryer which prevents occurrence of abnormality in a recording medium even at an emergency stop of conveyance of the recording medium during drying.SOLUTION: A dryer includes conveying means which conveys a conveyed member, a plurality of heating means which heat the conveyed member, cooling means which is arranged in a position opposite to the heating means with the conveyed member interposed therebetween, and conveyance detection means which detects stop of conveyance of the conveyed member. The conveying means changes a holding position of the conveyed member so as to hold the conveyed member in a position for contacting the conveyed member with the cooling means or a position for separating the conveyed member from the cooling means, and moves to a position for contacting the conveyed member with the cooling means when the conveyance of the conveyed member is stopped.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drying apparatus and an image forming apparatus.

  2. Description of the Related Art An image forming apparatus that forms an image by applying an ink liquid to a continuous sheet-like medium is known that includes a drying device that promotes drying of the ink liquid applied to the medium.

  As a drying method applicable to the above-described drying apparatus, a heating roller method in which a heating roller containing a halogen lamp as a heat source is brought into contact with the recording medium, or heat generated from an infrared heater is applied to the recording medium. An infrared heater heating method for drying and a convection heat transfer method using hot air are known.

  In recent years, the amount of ink liquid applied to a medium tends to increase due to high image quality in the image forming process. In addition, there is a demand for increasing the productivity of the image forming process. In order to meet both the increase in the amount of ink liquid and the improvement in productivity of the image forming process, it is necessary to quickly dry the ink liquid applied to the medium. In such a drying apparatus, a drying method using a radiation method by heating with an infrared heater may be used (see, for example, Patent Document 1).

  In the drying method disclosed in Patent Document 1, when the conveyance of the medium is abnormally stopped, the heating of the medium continues for a certain time even if the operation of the infrared heater is stopped. When the heating to the medium is continued locally, “medium abnormality” occurs at the heated portion. Here, “medium abnormality” means a state of causing “yellowing” in which the medium is burnt and its color is changed to yellow, ignition from the medium, and the like. That is, the conventional drying apparatus has a problem in that the occurrence of “medium abnormality” is prevented when the conveyance of the medium is urgently stopped.

  An object of the present invention is to provide a drying apparatus that prevents an occurrence of an abnormality in a recording medium even when the conveyance of the recording medium being dried stops urgently.

  The present invention for solving the above-described problems is a drying apparatus that dries while transporting a transported member to which a liquid is applied, and includes a transport unit that transports the transported member and a plurality of members that heat the transported member. A heating means, a cooling means arranged at a position facing the heating means across the transported member, and a transport detection means for detecting the transport stop of the transported member by the transporting means, The transport means changes the holding position of the transported member so that the transported member is held at either the position where the transported member contacts the cooling means or the position where the transported member is separated from the cooling means, and transports the transported member. When it stops, it moves to the position which contacts the said to-be-conveyed member with the said cooling means, It is characterized by the above-mentioned.

  According to the present invention, even when the conveyance of a recording medium being dried is stopped urgently, it is possible to prevent an abnormality from occurring in the recording medium.

1 is a schematic configuration diagram of an ink jet recording apparatus according to an embodiment of the present invention. The schematic block diagram of the drying part which concerns on one Embodiment of this invention. The figure which shows the structure of the non-contact-type heating means with which a drying part same as the above is provided. The figure which illustrates the state at the time of medium conveyance of a drying part same as the above. The figure which illustrates the state at the time of emergency stop of a drying part same as the above. The figure which shows the hardware constitutions of the control part with which a drying part same as the above is provided. The figure which shows the function structure of the control part with which a drying part same as the above is provided. The flowchart which shows the example of the flow of a process in a drying part same as the above. The figure which shows the function structure path | route of the drying part which concerns on another embodiment of this invention. The figure which illustrates the operation | movement at the time of emergency stop of the drying part which concerns on another embodiment of this invention. The flowchart which shows the example of the flow of the process in the drying part which concerns on another embodiment of this invention.

  The drying device according to the present invention has an abnormality that occurs in a recording medium stopped in the vicinity of a heating unit that heats the medium to dry the liquid applied to the medium when the conveyance operation is urgently stopped during conveyance of the medium. It is one of the gist to prevent this. Specifically, a part of the medium in which the conveyance of the medium is urgently stopped and stays directly under the heating means (heat source) is provided with a structure that can suppress the temperature rise even if the heating is continued. In addition, an image forming apparatus according to the present invention includes a drying apparatus having the above-described characteristics.

  Hereinafter, embodiments of a drying apparatus and an image forming apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically showing a configuration of an ink jet recording apparatus 100 which is an embodiment of an image forming apparatus according to the present invention. The ink jet recording apparatus 100 is an apparatus that uses a continuous sheet-like member as a recording medium and forms an image on the recording medium. The recording medium is a transported member that is transported through a transport path formed inside the inkjet recording apparatus 100. The transported member is transported with ink liquid applied thereto, and in the present embodiment, a continuous paper is taken as an example, and this will be described as continuous paper 2. The ink jet recording apparatus 100 includes an image forming unit 30 including a liquid discharge head 3 that discharges ink liquid onto the continuous paper 2.

  The image forming unit 30 includes a plurality of liquid ejection heads 3 as ink liquid application units, and ejects liquid ink and ink droplets of four colors from the upstream side in the transport direction of the continuous paper 2. Heads 3AK, 3BC, 3CM, 3DY are arranged. The liquid ejection head 3AK ejects black ink droplets, 3BC ejects cyan ink droplets, 3CM ejects magenta ink droplets, and 3DY ejects yellow ink droplets, respectively. The type and number of colors are not limited to this. Further, as shown in FIG. 1, the liquid ejection heads 3 are arranged in the order in which the ink droplets of black, cyan, magenta, and yellow are ejected from upstream to downstream in the transport direction of the continuous paper 2. Is not limited to this. The image forming unit 30 includes a control device that controls each operation of the liquid ejection head 3 based on an image forming instruction from an external device. The control device of the image forming unit 30 operates to discharge an appropriate amount of ink liquid in a timely manner based on an image formation instruction, and forms an image on the continuous paper 2.

  The continuous paper 2 that is a member to be transported is unwound from the original winding roller 202, and is sent out onto a transport guide member 42 disposed facing the image forming unit 30 by the transport roller 41 of the transport unit 40. The continuous paper 2 is guided in the transport direction by the transport guide member 42. The control device of the image forming unit 30 performs control so that ink droplets are ejected when the continuous paper 2 passes through the conveyance guide member 42. The continuous paper 2 on which an image is formed in the image forming unit 30 passes through the drying unit 50 which is an embodiment of the drying apparatus according to the present invention, is sent out by the discharge roller 6, and is wound up by the winding roller 205. The continuous paper 2 is conveyed in a predetermined direction by rotational driving of a conveyance roller 41 provided in the conveyance unit 40.

  Next, a detailed configuration of the drying unit 50 according to the present embodiment will be described with reference to FIG. The drying unit 50 includes a non-contact heating unit 70, a contact heating unit 80, and a tension applying unit 90. The drying unit 50 also includes a control unit 500 that controls the operation of the non-contact heating unit 70. The drying unit 50 constitutes a drying unit including a plurality of heating units having different heating methods.

  The non-contact type heating unit 70 is a non-contact type heating unit including a driving roller 71 composed of a first driving roller 71a and a second driving roller 71b. In the following description, when it is not necessary to distinguish the first drive roller 71a and the second drive roller 71b, they are collectively referred to as the drive roller 71. The continuous paper 2 on which the image is formed in the image forming unit 30 is dried on the image forming surface side in the non-contact heating unit 70, and then heated from the back side of the image forming surface in the contact heating unit 80. Further drying takes place. The detailed structure of the non-contact type heating unit 70 will be described later.

  The contact-type heating unit 80 includes a heating drum 83, a plurality of heating rollers 81 (81a, 81b, 81c, 81d, 81e, 81f, 81g), and a plurality of hot air sprays disposed at positions facing the heating roller 81. Part 82 (82a, 82b, 82c, 82d, 82e, 82f, 82g).

  The heating roller 81 is arranged in an arc shape around the heating drum 83 so as to surround the heating drum 83. By the heating roller 81, the continuous paper 2 is conveyed while drawing an arc on the outer peripheral portion of the heating drum 83. The heating roller 81 and the heating drum 83 are in contact with the surface opposite to the surface on which the image of the continuous paper 2 is formed. The heating roller 81 has a predetermined curvature surface with which the back side of the continuous paper 2 comes into contact, and the continuous paper 2 has a curvature surface in the entire area in the axial direction of the heating roller 81, which is a direction orthogonal to the medium conveyance direction of the continuous paper 2. It arrange | positions so that it may closely_contact | adhere.

  The heating roller 81 includes a heater lamp such as a halogen lamp, and the temperature is controlled by the control device of the contact heating unit 80. Note that it is not necessary for all the heating rollers 81 arranged around the heating drum 83 to include a heater lamp, and at least one heating roller 81 may include a heater lamp.

  The heating drum 83 is one of contact-type heating means that is controlled in temperature different from the heating roller 81. The heating drum 83 is controlled so that the transport speed of the continuous paper 2 transported inside the drying unit 50 is kept constant. The ink droplets on the image forming surface of the continuous paper 2 are dried by heating from the non-contact heating unit 70, the heating roller 81, and the heating drum 83. The water in the ink droplets is first dried by the plurality of heating means, and then, the solvent that is not volatile among the solvents mixed in the ink is dried, and further, the solvent that is easily volatile is dried. It is configured as follows. Therefore, the temperature of each heating means of the non-contact heating unit 70 and the contact heating unit 80 is controlled to be different temperatures.

  The continuous paper 2 that has passed through the contact-type heating unit 80 is guided to the tension applying unit 90 via the guide rollers 61, 62, and 63 even as a “first touch roller” whose image forming surface first comes into contact with the roller. .

  The tension applying unit 90 includes a plurality of idle rollers 91 and a tension adjusting roller 92 as tension adjusting means. The idle roller 91 is fixed at a predetermined position. Thus, the continuous paper 2 is guided so as to be conveyed in a predetermined conveyance path. The tension adjusting roller 92 is a roller for applying tension to the continuous paper 2 and maintains a state in which a force in the direction of gravity is applied to the continuous paper 2. A tension of a predetermined magnitude is applied to the continuous paper 2 in the transport path by the tension adjusting roller 92. When the continuous paper 2 is in the transport state, the tension adjustment roller 92 is positioned above, and when the continuous paper 2 is not being transported, the tension adjustment roller 92 is positioned below.

  Next, the structure of the non-contact type heating unit 70 will be described in detail with reference to FIG. The non-contact heating unit 70 includes a driving roller 71, a radiant heat release unit 72, and a conveying member cooling unit 73.

  The drive roller 71 is a transport unit that includes a first drive roller 71a disposed on the upstream side in the transport direction of the continuous paper 2 and a second drive roller 71b disposed on the downstream side in the transport direction. The driving roller 71 is an idler roller that rotates along with the transport of the continuous paper 2 transported by the transport roller 41 of the transport unit 40. The driving roller 71 (the first driving roller 71a and the second driving roller 71b) is configured so that when the continuous paper 2 is transported, the continuous paper 2 being transported is transferred to the radiant heat release unit 72, the transport member cooling unit 73, and the like. Hold in place. As a result, the continuous paper 2 is conveyed from the radiant heat emitting unit 72 while being held in a non-contact state without contacting the radiant heat emitting unit 72 and the conveying member cooling unit 73. The ink liquid is dried by receiving heat and being dried. That is, according to the drying unit 50, the image formed on the continuous paper 2 by the image forming unit 30 can be dried without being stained in the drying process. When the conveyance roller 41 of the conveyance unit 40 is urgently stopped for some reason and the conveyance signal from the conveyance unit 40 is stopped, the conveyance operation of the continuous paper 2 is urgently stopped. At this time, both the first drive roller 71a and the second drive roller 71b are controlled to move to a predetermined position that has been lowered. The operation (up and down) of the drive roller 71 is controlled by the control unit 500 provided in the drying unit 50. The driving roller 71 changes the holding position of the continuous paper 2.

  The radiant heat emitting unit 72 includes an infrared heater lamp 721 that emits radiant heat and a wind generating unit 722 that blows the emitted radiant heat onto the continuous paper 2. The infrared heater lamp 721 and the wind generating unit 722 are a pair. It is configured. This radiant heat release portion 72 constitutes a non-contact type heating means. A plurality of pairs of the infrared heater lamp 721 and the wind generation unit 722 are arranged in the conveyance direction of the continuous paper 2. That is, the heat from the radiant heat release unit 72 is configured to be applied within a predetermined length range in the conveyance direction of the continuous paper 2. Thereby, the continuous paper 2 being conveyed can be efficiently dried from the image forming surface side. The temperature control of the infrared heater lamp 721 and the control of the strength of the wind blown by the wind generation unit 722 are performed by a control unit included in the control unit 500.

  The infrared heater lamp 721 irradiates the continuous paper 2 with infrared light having a maximum wavelength within the water absorption wavelength band. For example, the infrared heater lamp 721 irradiates the infrared heater 31 with infrared rays having a maximum wavelength in a band of 2 to 6 μm.

  The wind generation unit 722 constitutes a wind generation unit that blows the heat radiated from the infrared heater lamp 721 onto the continuous paper 2. The wind generator 722 promotes heating of the continuous paper 2.

  When the transport operation of the continuous paper 2 by the transport unit 40 is urgently stopped, the transport unit 40 notifies the control unit 500 of a transport stop signal. When detecting the conveyance stop signal, the control unit 500 detects the stop of the moving image of the driving roller 71 as a driving unit, and thus stops the operation of the infrared heater lamp 721 and the wind generation unit 722. At this time, the blowing of wind from the wind generating unit 722 can be stopped immediately, but even if the operation of the infrared heater lamp 721 is stopped (the power is stopped), the heat radiated from the internal heat source is immediately It will not disappear. The infrared heater lamp 721 is arranged corresponding to a predetermined length in the transport direction of the image forming surface of the continuous paper 2. Therefore, when the drive motor of the transport roller 41 is stopped, the continuous paper 2 is continuously heated by the radiant heat from the infrared heater lamp 721, particularly the portion immediately below the radiant heat release portion 72.

  The conveyance member cooling unit 73 is disposed at a position facing the radiant heat release unit 72 with the continuous paper 2 interposed therebetween. The conveying member cooling unit 73 constitutes a cooling unit that cools the contact portion and the surrounding portion when the continuous paper 2 comes into contact therewith. The conveying member cooling unit 73 has a structure that is constantly cooled so as to maintain a temperature lower than that of the continuous paper 2 that is heated by receiving radiant heat from the radiant heat emitting unit 72 by water cooling or air cooling. Accordingly, when the drying unit 50 is operating normally, it is possible to prevent the components arranged below the non-contact heating unit 70 from becoming high temperature.

  The conveyance member cooling unit 73 is made of, for example, a plate-like member that is made of a metal having good heat dissipation characteristics and includes a planar portion to which the continuous paper 2 can be in close contact. In the case of water cooling, the conveying member cooling unit 73 includes a metal tube that allows a cooling medium to flow on the back side of the surface that the continuous paper 2 contacts, and lowers the temperature on the contact surface side of the continuous paper 2 with the cooling medium. In the case of air cooling, air supply means for forcibly applying air to the back side of the surface with which the continuous paper 2 contacts is provided.

  The shape of the conveyance member cooling unit 73 is a curved surface shape in which the surface in contact with the continuous paper 2 forms an arc shape in the conveyance direction of the continuous paper 2. As a result, the continuous paper 2 placed in the conveying member cooling unit 73 comes into close contact with the conveying member cooling unit 73. The surface with which the continuous paper 2 comes into contact is not limited to an arc shape as long as adhesion can be secured, and may be a linear shape or a roller shape. When the continuous paper 2 comes into close contact with the conveying member cooling unit 73, the heat of the portion whose temperature is increased by the heating by the radiant heat emitting unit 72 is transmitted to the conveying member cooling unit 73. As a result, the heat of the continuous paper 2 in the portion in contact with the conveyance member cooling unit 73 and the surrounding portion is lowered. By suppressing the temperature rise due to partial heating of the continuous paper 2, yellowing (burn) occurring on the image forming surface can be prevented.

  Next, operation | movement of the drying part 50 and the tension | tensile_strength provision part 90 is demonstrated using FIG.4 and FIG.5. FIG. 4 illustrates a state in which the continuous paper 2 is being transported. FIG. 5 illustrates an operation when a conveyance stop signal notification is received from the conveyance unit 40.

  As shown in FIG. 4, when the continuous paper 2 is being conveyed, the first drive roller 71a and the second drive roller 71b are held at the raised positions. Thus, the continuous paper 2 is in a state of passing between the radiant heat release unit 72 and the transport member cooling unit 73. At this time, the continuous paper 2 is given a predetermined tension in the transport direction by the transport operation. Due to this tension, the tension adjusting roller 92 is held at the raised position.

  FIG. 5 illustrates a state in which the conveyance of the continuous paper 2 has been urgently stopped. As shown in FIG. 5, when the transport unit 40 stops urgently, the drying unit 50 receives a transport stop signal notifying it. Since the operation of the transport roller 41 has already stopped, the accompanying rotation of the first drive roller 71a and the second drive roller 71b has also stopped. That is, the continuous paper 2 is brought into a state where the conveyance is stopped in response to the conveyance stop signal. At this time, both the first drive roller 71a and the second drive roller 71b are controlled to move to the lowered position. When the driving roller 71 moves to the lowered position, the tension applied to the continuous paper 2 becomes weaker than that in the conveying state. Therefore, the tension adjusting roller 92 that adjusts the tension applied to the continuous paper 2 is not held at the transporting position (upper position), and is lowered by its own weight. When the tension adjusting roller 92 is lowered, the continuous paper 2 is pulled downward into the tension applying unit 90. As the tension adjusting roller 92 is lowered, a predetermined tension is applied to the continuous paper 2 in a state where the driving roller 71 has reached the lowered position. By applying this tension, the continuous paper 2 comes into close contact with the upper surface side of the conveying member cooling unit 73.

  As already described, when the conveyance of the continuous paper 2 is urgently stopped, the operations of the infrared heater lamp 721 and the wind generation unit 722 in the radiant heat release unit 72 are turned off, but even if these operations are turned off, the continuous paper 2 It does not result in a state in which heating to is immediately stopped. Therefore, even if the conveyance of the continuous paper 2 is stopped, the heating is continued and the temperature of a part of the continuous paper 2 rises. If it does so, abnormality, such as yellowing, will arise in the said location where continuous heating continues. In order to prevent this, when the conveying operation of the drying unit 50 is urgently stopped, the driving roller 71 descends and moves to a position where it contacts the conveying member cooling unit 73 with a distance from the radiant heat release unit 72. At this time, since the tension adjusting roller 92 is lowered, the tension corresponding to the predetermined position is applied to the continuous paper 2. Due to this tension, the corresponding portion of the continuous paper 2 that continues to be heated and the vicinity thereof are brought into close contact with the conveying member cooling unit 73. Thereby, the heat of the portion where the heating continues can be efficiently exhausted by heat transfer, and it is possible to prevent the continuous paper 2 from being abnormal such as yellowing. Since the back side of the image forming surface of the continuous paper 2 is in close contact with the conveying member cooling unit 73, it is possible to prevent the occurrence of abnormality without smearing the image even when the ink droplets are not dry.

  Next, control of the drying part 50 which is embodiment of the drying apparatus which concerns on this invention is demonstrated. FIG. 6 is a hardware configuration diagram of the control unit 500 that controls the operation of the drying unit 50. The control unit 500 includes hardware similar to a general computer. That is, a CPU 510, a RAM 520, a ROM 530, and an I / F 540 are provided, and these are connected by a bus 550. The CPU 510 reads the control program stored in the ROM 530 and operates it using the storage area of the RAM 520, thereby realizing a functional block described later. The I / F 540 is an interface that receives a conveyance stop signal from the conveyance unit 40 and inputs it to the CPU 510, connects to the drive roller 71, the drive motor, and the conveyance member cooling unit 73, and transmits a control signal for these.

  In the hardware configuration described above, a control unit block that controls the operation of the drying unit 50 is configured by executing a control program stored in the ROM 530. FIG. 7 is a functional block diagram illustrating a functional configuration of the control unit 500 of the drying unit 50 according to the embodiment. The control unit 500 includes a conveyance stop signal monitoring unit 501 and a driving roller position adjusting unit 502.

  The conveyance stop signal monitoring unit 501 monitors the conveyance stop signal from the conveyance unit 40. When the conveyance stop signal is received from the conveyance unit 40, the drive roller position adjustment unit 502 is notified accordingly. The conveyance stop signal monitoring unit 501 constitutes a conveyance detection unit that detects operation stop of the conveyance operation by the driving roller 71 which is a conveyance unit.

  The drive roller position adjustment unit 502 controls the position of the drive roller 71 to change in response to the notification from the conveyance stop signal monitoring unit 501.

  Next, the control flow of the drying unit 50 executed in the control unit 500 will be described with reference to FIG. If the conveyance stop signal from the conveyance unit 40 is not detected by the conveyance stop signal monitoring unit 501 (S801 / NO), the drive roller position adjustment unit 502 moves the drive roller 71 to the raised position (S802). At this time, if the position of the driving roller 71 is already in the raised position, the position is held. Accordingly, the continuous paper 2 is located at a position where it is separated from the conveying member cooling unit 73. After that, if the operation of the drying unit 50 is finished (S803 / YES), the process is finished. If the operation of the drying unit 50 is not completed, the process returns to S801 (S803 / NO). Thereafter, if the conveyance stop signal from the conveyance unit 40 is continuously detected (S801 / YES), the drive roller 71 is continuously held at the lowered position (S804).

  In S801, when the conveyance stop signal from the conveyance unit 40 is detected by the conveyance stop signal monitoring unit 501 (S801 / YES), the drive roller position adjustment unit 502 moves the drive roller 71 to the lowered position (S804). At this time, if the position of the driving roller 71 is already in the lowered position, the position is held. As a result, the continuous paper 2 is positioned so as to contact the conveying member cooling unit 73.

  In S804, when the drive roller 71 is held at the lowered position, the tension associated with the continuous paper 2 is weakened. When the tension is weakened, the tension adjusting roller 92 is lowered. As the tension adjustment roller 92 is lowered, the continuous paper 2 is in a state of being tensioned according to the position of the tension adjustment roller 92. Due to the action of the tension, the continuous paper 2 comes into close contact with the conveying member cooling unit 73. As described above, for the continuous paper 2 that has stopped transporting, the tension adjusting roller 92 acts on the continuous paper 2 so that the continuous paper 2 is in close contact with the transport member cooling unit 73, thereby efficiently removing heat. it can.

  Next, another embodiment of the drying apparatus according to the present invention will be described. Since the hardware configuration is the same, the description is omitted. FIG. 9 is a functional block diagram showing a functional configuration of the control unit 500a of the drying unit 50 according to the present embodiment. The control unit 500a includes a conveyance stop signal monitoring unit 501 and a cooling unit position adjusting unit 503. The cooling unit position adjustment unit 503 performs control so as to change the position of the conveyance member cooling unit 73a in response to the notification from the conveyance stop signal monitoring unit 501.

  Here, the operation of the non-contact heating unit 70a according to the present embodiment will be described with reference to FIG. When the conveyance stop signal is received from the conveyance unit 40, the control unit 500a moves the position of the conveyance member cooling unit 73a to a position closer to the radiant heat release unit 72 than at normal time (during conveyance). When the conveyance stop signal is received from the conveyance unit 40, the operation of the conveyance roller 41 is stopped, so that the tension applied to the continuous paper 2 is weakened. Therefore, the continuous paper 2 is pushed up by moving the position of the conveying member cooling unit 73a upward from the normal position. When the continuous paper 2 is pushed up from the time of conveyance, a predetermined tension is applied to the continuous paper 2 by the tension adjusting roller 92, so that the continuous paper 2 is brought into close contact with the conveyance member cooling unit 73a by the action of the tension. To come. Therefore, even if the continuous paper 2 continues to receive heat from the radiant heat release portion 72, the temperature rise can be suppressed, and occurrence of abnormality such as yellowing can be prevented.

  Next, the control flow of the drying unit 50 executed in the control unit 500a will be described with reference to FIG. If the transport stop signal from the transport unit 40 is not detected by the transport stop signal monitoring unit 501 (S1101 / NO), the cooling unit position adjusting unit 503 holds the position of the transport member cooling unit 73a at the transporting position ( S1102). Thereafter, if the operation of the drying unit 50 is finished (S1103 / YES), the process is finished. If the operation of the drying unit 50 is not completed, the process returns to S1101 (S1103 / NO). Thereafter, until the conveyance stop signal from the conveyance unit 40 is detected (S1101 / NO), the conveyance member cooling unit 73 is held at the normal position during conveyance (S1102).

  In S1101, if the transport stop signal from the transport unit 40 is detected by the transport stop signal monitoring unit 501 (S1101 / YES), the cooling unit position adjusting unit 503 raises the transport member cooling unit 73a to cool the transport member. The continuous paper 2 is brought into close contact with the section 73 (S1104).

  The state in which the conveyance stop signal is notified in S1101 is a state in which the conveyance roller 41 stops its operation and the tension on the continuous paper 2 is weakened. When the tension of the continuous paper 2 becomes weak, the tension adjusting roller 92 moves downward as compared with the time of conveyance. At this time, since the lifting force is applied to the tension adjusting roller 92 by raising the conveying member cooling unit 73a, the tension is lowered to a certain position. By staying at that position, tension is applied to the continuous paper 2. It becomes a state to grant. Due to the action of the tension, the continuous paper 2 is brought into close contact with the conveying member cooling unit 73a. Thereby, the heat applied to the continuous paper 2 can be efficiently removed.

  In each of the above embodiments, the conveyance member is described using the continuous paper 2 (continuous paper) as an example. However, the conveyance member in the embodiment is not limited to this, and the drying member according to the present invention is used. Any member that can be transported in the apparatus may be used. For example, in addition to a continuous material such as continuous paper, roll paper, and web, and a recording medium (printed material) such as a long sheet material, a printed material such as wallpaper or a sheet for an electronic circuit board such as a prepreg may be used.

  In addition, the inkjet recording apparatus 100 according to the present embodiment exemplifies an apparatus that records an image such as a character or a figure with a liquid such as ink on the conveying member. However, for the purpose of decoration, decoration, etc. An image having no meaning may be applied with a liquid such as ink.

  The liquid used in the inkjet recording apparatus 100 and applied to the conveying member is not particularly limited, but it is preferable that the viscosity is 30 mPa · s or less at normal temperature, normal pressure, or by heating and cooling. More specifically, solvents such as water and organic solvents, colorants such as dyes and pigments, functional materials such as polymerizable compounds, resins, and surfactants, and biocompatible materials such as DNA, amino acids, proteins, and calcium. And edible materials such as natural pigments, solutions, suspensions, emulsions and the like. These can be used, for example, in applications such as inkjet inks, surface treatment liquids, components for electronic elements and light emitting elements, liquids for forming electronic circuit resist patterns, and three-dimensional modeling material liquids.

  The liquid discharge head 3 according to the present embodiment includes a thermal actuator that uses an electrothermal conversion element such as a piezoelectric actuator (laminated piezoelectric element and thin film piezoelectric element) or a heating resistor as an energy generation source for discharging liquid. Those using an electrostatic actuator composed of a diaphragm and a counter electrode are included.

  Note that image formation in this application has the same meaning as printing, recording, printing, printing, and the like.

2 Continuous Paper 3 Liquid Discharge Head 6 Discharge Roller 30 Image Forming Unit 31 Infrared Heater 40 Conveying Unit 41 Conveying Roller 42 Conveying Guide Member 50 Drying Unit 70 Non-Contact Heating Unit 71 Driving Roller 72 Radiation Heat Dissipating Unit 73 Conveying Member Cooling Unit 90 Tension Giving unit 91 Idle roller 92 Tension adjusting roller 100 Inkjet recording apparatus 500 Control unit 501 Conveyance stop signal monitoring unit 502 Drive roller position adjusting unit 503 Cooling unit position adjusting unit 721 Infrared heater lamp 722

Japanese Patent Laid-Open No. 5-8372

Claims (9)

A drying device for drying while transporting a transported member to which a liquid is applied,
Conveying means for conveying the member to be conveyed;
A plurality of heating means for heating the transported member;
A cooling unit disposed at a position facing the heating unit across the transported member;
A transport detection means for detecting a transport stop of the transported member by the transport means;
With
The transport means changes the holding position of the transported member so that the transported member is held at either the position where the transported member is brought into contact with the cooling means or the position where the transported member is separated from the cooling means. Is moved to a position where the transported member is brought into contact with the cooling means,
A drying apparatus characterized by that. A tension adjusting means for adjusting a tension applied to the transported member in the transport direction;
The tension adjusting unit applies the tension so that the transported member is in close contact with the cooling unit when the transport detecting unit detects the operation stop of the transport unit.
The drying apparatus according to claim 1. The cooling means has a circular arc contact surface to the transported member,
The drying apparatus according to claim 1 or 2. The transport means is a pair of drive motors that hold the transported member so that the transported member passes between the heating means and the cooling means,
The drive motor operates at a position where the transported member is not in contact with the cooling means while the transported member is transported, and operates so that the transported member is at a position where the transported member is in contact with the cooling means while operation is stopped To
The drying apparatus according to any one of claims 1 to 3. The heating means heats the transported member in a non-contact manner;
The drying apparatus according to any one of claims 1 to 4. The heating means heats the transported member with infrared light having a maximum wavelength within the water absorption wavelength band.
The drying apparatus according to any one of claims 1 to 5. The heating means includes wind generating means for generating wind for blowing heat from the infrared rays to the transported member.
The drying apparatus according to claim 6. A contact-type heating means different in heating method from the heating means;
The contact-type heating unit is composed of a heating drum having a curved contact surface that contacts the opposite side of the heating unit to the heated member, and a heating roller.
The heating roller is arranged in an arc shape so as to surround the periphery of the heating drum.
The drying apparatus according to any one of claims 1 to 7. An image forming apparatus for forming an image on a transported member,
Ink liquid applying means for applying ink liquid to the image forming surface of the transported member;
Drying means for drying the ink liquid;
With
The drying means is a drying apparatus according to any one of claims 1 to 8.
An image forming apparatus.