JP2015098151A - Sheet material placement device and image formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet material placement device which inhibits a recorded medium from being lifted from a placement part compared to a conventional sheet material placement device which suctions air in its placement part, and to provide an image formation device including the sheet material placement device.SOLUTION: A recorded medium placement device 200 includes: a placement base 10 on which a recording sheet 50 is placed; and placement surface recessed parts 13 provided on the placement base 10. The recorded medium placement device 200 further includes an adsorption liquid supply/suction device 400 having a function of liquid supply means which supplies an adsorption liquid 11 to the placement surface recessed parts 13 and a function of liquid suction means which suctions the adsorption liquid 11 in the placement surface recessed parts 13.

Description

  The present invention relates to a sheet material placing device and an image forming apparatus on which a sheet material is placed.

  In recent years, it has been known to employ a method in which functional liquid containing ink is ejected by an ink jet method as means for forming an appropriate image on a sheet material, patterning with a functional material, or coating on a cover. ing.

As a fixing method for fixing droplets ejected by the ink jet method to a sheet material, there is known a fixing method that uses heat to promote drying of the droplets. In addition, as another fixing method, a method in which droplets discharged onto a sheet material using an inkjet method include an ultraviolet curable monomer liquid, and the droplets on the sheet material are fixed by causing a curing reaction by ultraviolet irradiation. Known (Patent Documents 1 and 2, etc.).
An image forming process using a so-called ultraviolet curable ink that undergoes a curing reaction upon irradiation with ultraviolet rays can be fixed in a shorter time than an image forming process in which drying of droplets is promoted and fixed.

  In an image forming process using ultraviolet curable ink, an ultraviolet curable ink droplet is landed on a printing surface of a sheet-like recording medium placed on a placement portion, thereby forming an image. After the image is formed, the ultraviolet ray is irradiated onto the printing surface of the recording medium by an ultraviolet lamp, whereby the ultraviolet curable ink is cured by crosslinking reaction and fixed.

  However, since the irradiation light irradiated by the ultraviolet lamp includes irradiation with heat rays (infrared rays and the like), the surface temperature on the printing surface side of the recording medium is increased, and the surface on the printing side is heated due to thermal expansion. It becomes longer than the surface on the side facing the mounting portion and is curved. As a result, a part of the recording medium is lifted up and may come into contact with other members opposed to the placement portion and be damaged. For example, when a curved recording medium comes into contact with an ultraviolet lamp and unfixed ultraviolet curable ink adheres to the ultraviolet lamp, it solidifies in the adhered state, blocks the irradiation light of the ultraviolet lamp, or is heated by the irradiation light, The lamp may be damaged. Therefore, it is required to suppress a part of the curved recording medium from floating from the placement unit.

Japanese Patent Application Laid-Open No. H10-228561 describes an apparatus in which an opening for sucking air is provided on the surface of the mounting portion, and air is sucked when a recording medium is placed on the mounting portion. By sucking air in a state where the recording medium is positioned on the opening of the mounting portion, a negative pressure acts on the opening, and the recording medium can be adsorbed on the mounting portion. By adsorbing the recording medium to the mounting portion in this way, it is possible to suppress the recording medium from floating from the mounting portion.
However, the surface of the recording medium and the surface of the mounting portion have slight irregularities even if they appear to be smooth, and there is a slight gap between the surface of the recording medium and the surface of the mounting portion. . In the case where the recording medium is sucked by sucking air, the air passes through this slight gap and the pressure is released, so there is a limit to increasing the suction force, and the lifting of the recording medium is sufficiently suppressed. There was a risk that it would be impossible.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to prevent a recording medium from floating from the placement unit, compared to a conventional sheet that sucks air at the placement unit. It is an object to provide a material placing device and an image forming apparatus including the material placing device.

  In order to achieve the above object, the invention of claim 1 of the present application provides a sheet material placement device including a placement portion on which a sheet material is placed, and a recess provided in the placement portion, and the recess. A liquid supply means for supplying a liquid and a liquid suction means for sucking the liquid in the recess are provided.

  According to the present invention, there is an excellent effect that it is possible to suppress the recording medium from being lifted from the placement unit, as compared with the conventional one in which air is sucked by the placement unit.

FIG. 2 is an explanatory diagram of a printer according to a first exemplary embodiment; FIG. 1 is a cross-sectional view of a printer to which the present invention can be applied. FIG. 3 is a perspective view of the printer shown in FIG. 2. FIG. 3 is an explanatory perspective view of the printer according to the first embodiment. FIG. 4 is an explanatory diagram of a printer according to a second embodiment; FIG. FIG. 6 is an enlarged perspective view of a mounting surface recess. FIG. 6 is a schematic cross-sectional view of the entire printer of Example 3. FIG. 6 is a perspective explanatory view of a printer according to a third embodiment. FIG. 7 is an enlarged cross-sectional view of the vicinity of a placement surface recess according to the fourth embodiment, (a) is an explanatory view before placing a recording sheet, and (b) is an explanatory view when the recording sheet is placed. FIG. 10 is an enlarged cross-sectional view of the vicinity of a portion where a pressing roller of the recording medium mounting device of Example 5 is arranged. FIG. 7 is a schematic cross-sectional view of the entire printer of Example 6. Sectional drawing of the conventional printer provided with a vacuum suction apparatus. The perspective view of the conventional printer. The expanded sectional view of the suction opening part vicinity of the mounting base of the conventional printer. Explanatory drawing of the state which the float by heat deformation produced in the recording sheet with the conventional printer.

  Hereinafter, an embodiment in which the present invention is applied to an inkjet image forming apparatus (hereinafter referred to as a printer 100) will be described. The printer 100 described below is an example of an image forming apparatus including a recording medium mounting apparatus to which the present invention can be applied, and the present invention is not limited to this.

2 is a cross-sectional view of a printer 100 that is an image forming apparatus having an ultraviolet irradiation device to which the present invention is applicable, and FIG. 3 is a perspective view of the printer 100 shown in FIG.
The printer 100 forms an image by ejecting ultraviolet curable ink (hereinafter also simply referred to as “ink”), which is actinic ray curable ink, onto the recording sheet 50. Then, the ultraviolet ray irradiation by the UV lamp 8 which is an actinic ray irradiating means is performed on the printing surface on which the ink on the recording sheet 50 is discharged, whereby the photocuring initiator contained in the ink reacts and the ultraviolet curable ink is cured. And an image forming apparatus.

  Hereinafter, image formation by conveying a recording medium in the X-axis direction (arrow α direction in the figure) to a head unit 6 described later is also referred to as “main scanning”. In addition, after the head unit 6 forms an image in the main scanning direction, a line feed is made in the Y-axis direction (arrow β direction in the figure) while the head unit 6 does not eject ink in order to perform main scanning in a new image forming area. Is also referred to as “sub-scanning”.

The printer 100 is provided with a portal beam 2 on a solid base 1 that serves as a base, and a Y-axis linear motor 3 that operates in the Y-axis direction is suspended as shown in the figure.
There is a Y-axis scanning carrier 4 that is moved in the Y-axis direction by a Y-axis linear motor 3. The printer 100 is provided with a Z-axis head stage 5 that moves up and down in the Z-axis direction on a Y-axis scanning carrier 4, and further includes a head unit 6 that individually ejects many (color) types of ink, and a UV lamp 8. And are attached integrally.

  Since the head unit 6 and the UV lamp 8 are adjacent and integrally attached, the positional relationship between them is always constant. However, the scanning timing in the X-axis direction (main scanning direction) at which the head unit 6 ejects ink and the scanning timing in the X-axis direction at which the UV lamp 8 irradiates ultraviolet rays are not necessarily simultaneous. For example, when ink is ejected, scanning in the X-axis direction is performed at a high speed, and then only ultraviolet irradiation is scanned at a low speed, so that the curing reaction by ultraviolet light can be reliably performed.

An X-axis linear motor 7 that moves the mounting table 10 in the X-axis direction orthogonal to the moving direction of the Y-axis linear motor 3 is mounted on the base 1. The mounting table 10 is a mounting unit for mounting and transporting (scanning) a recording medium. In the printer 100, the recording medium mounting apparatus 200 is configured by the base 1, the X-axis linear motor 7, and the mounting table 10.
A recording sheet 50, which is a recording medium, is placed on a placement surface 10f, which is the top surface of the placement table 10, and is UV curable by the head unit 6 at the main scanning timing when the placement table 10 passes under the head unit 6. By ejecting ink, the first image layer 51 as the first image is formed. Furthermore, the state shown in FIG. 2 is obtained by forming the second image layer 52, which is the next image, superimposed on the image.

  When image formation as shown in FIG. 2 is performed by the printer 100, the reaction of the curing initiator in the ink is started by irradiating the ultraviolet ray with the UV lamp 8 after forming the first image layer 51. . Then, after curing is sufficiently completed to the inside of the ink layer, the second image layer 52 as the next image is formed. Thereafter, irradiation with ultraviolet rays by the UV lamp 8 is performed again to start the curing initiator reaction in the ink of the image second layer 52, and the printed matter is completed by sufficiently completing the curing to the inside of the ink layer. Can do.

In this way, when UV irradiation is performed, not only ultraviolet rays but also heat rays are irradiated from the UV lamp 8, so that the surface temperature of the recording sheet 50 gradually increases locally due to the radiant heat, and due to thermal expansion, the mounting surface 10f side. The expansion on the printing surface (upper surface) side becomes larger than the surface (lower surface).
When the degree of expansion on the printing surface side increases, the recording sheet 50 has a force that causes the surface to extend and bend (hereinafter also referred to as “curling”) due to the temperature difference between the front and back surfaces, like bimetal. As a result, an action occurs in which a part (particularly the central part) of the recording sheet 50 tends to float above the placement surface 10f.

  In such a state, in the configuration in which the recording sheet 50 is merely placed on the placement surface 10f of the placement table 10, a part of the recording sheet 50 is lifted. When a part of the recording sheet 50 is lifted, the most curved portion of the printing surface of the recording sheet 50 may be rubbed against the nozzle surface of the head unit 6, and the nozzle surface may be scratched or ink ejection failure may occur. Further, the image first layer 51 already printed on the recording sheet 50 is also rubbed, and smear occurs, resulting in an image defect.

If the floating recording sheet 50 comes into contact with the UV irradiation surface of the UV lamp 8 which is at a high temperature, the first image layer 51 and the UV lamp 8 rub against each other. Furthermore, there is a possibility that the deformation of the recording sheet 50 is deteriorated due to heat propagation caused by the recording sheet 50 coming into contact with the ultraviolet irradiation surface that is at a high temperature. Further, the ink of the image first layer 51 already printed on the recording sheet 50 is transferred to the ultraviolet irradiation surface of the UV lamp 8 by contact, and the UV lamp 8 may break down due to heat generation. .
As a means for suppressing the curling of the recording sheet 50 that causes such a problem, the recording medium placing device 200 of the printer 100 is adapted to attract the placed recording sheet 50 to the placing surface 10f. Is provided.

Here, an example of a recording medium suction unit included in the conventional printer 100 will be described.
12 is a cross-sectional view of a conventional printer 100 including a vacuum suction device 600 as a means for suppressing curling of the recording sheet 50, and FIG. 13 is a perspective view of the conventional printer 100 shown in FIG.

A vacuum suction device 600 included in the conventional printer 100 shown in FIGS. 12 and 13 includes a vacuum pump 60, a vacuum three-way valve 61, a suction tube 63, and the like. Further, suction openings 66 are provided at a plurality of locations on the mounting surface 10 f of the mounting table 10 of the recording medium mounting device 200 of the conventional printer 100.
14 is an enlarged cross-sectional view of the vicinity of the suction opening 66 of the mounting table 10 shown in FIG. As shown in FIGS. 12 and 14, a negative pressure pipe 64 is provided inside the mounting table 10, and a negative pressure distributing portion 65 is provided at a plurality of locations of the negative pressure tube 64, and a plurality of locations on the mounting surface 10 f. Each of the suction openings 66 provided in the pipe is communicated with the negative pressure pipe 64.

In such a configuration, by driving the vacuum pump 60, a negative pressure acts on the negative pressure pipe 64 via the vacuum three-way valve 61 and the suction tube 63, and a plurality of suction openings are further connected via the negative pressure distributor 65. A negative pressure acts on each of the portions 66.
For this reason, by continuing to drive the vacuum pump 60 during the printing operation, negative pressure is always applied to the surface (lower surface) of the recording sheet 50 on the mounting surface side, and the recording sheet 50 is placed on the mounting table 10. Close contact with. When the recording sheet 50 is removed from the mounting table 10 after finishing the printing operation, in the vacuum three-way valve 61 provided between the vacuum pump 60 and the suction tube 63, the communication direction of the suction tube 63 is set to the atmosphere opening portion 62 side. Switch to. As a result, the inside of the path for applying the negative pressure of the vacuum pump 60 to the suction opening 66 such as the negative pressure pipe 64 and the negative pressure distributor 65 returns to the atmospheric pressure, so the suction opening 66 also becomes the atmospheric pressure, and the recording sheet 50 is It can be easily peeled off from the mounting surface 10 f of the mounting table 10.

However, even in such a conventional negative pressure vacuum suction method, the recording sheet 50 is also irradiated with heat rays when irradiated with ultraviolet rays from the UV lamp 8 during printing, so that the surface temperature gradually increases from the printing surface side and thermal expansion occurs. Thus, the expansion on the printing surface side is larger than the mounting surface side.
Further, in order to perform the curing reaction of the UV curable ink more reliably, the UV lamp 8 that irradiates the ultraviolet rays of the recording sheet 50 is made stronger, or the scanning speed of the ultraviolet irradiation is slowed to reduce the integrated light amount. It can be raised. However, if the cumulative amount of ultraviolet light with respect to the recording sheet 50 is increased, the cumulative amount of heat rays irradiated simultaneously with the ultraviolet rays also increases, so that the recording sheet 50 has a temperature difference like a bimetal as described above due to the influence of stronger heat. The force that tries to bend occurs.

FIG. 15 is an explanatory diagram of a state in which the printing surface side of the recording sheet 50 is greatly expanded and the float D is generated due to thermal deformation in the conventional printer 100.
When the degree of expansion on the printing surface side of the recording sheet 50 increases, as shown in FIG. 15, the recording sheet 50 has a force that tends to bend and extend on the printing surface side due to a temperature difference between the front and back surfaces, like a bimetal. As a result, an action occurs in which a part of the recording sheet 50 (particularly the central part) tends to float above the placement surface 10f. At this time, if the phenomenon that the recording sheet 50 is lifted temporarily occurs at a portion facing a part of the plurality of suction openings 66, the other suction openings 66 that are opened to the placement surface 10f are also large. An air leak occurs trying to return to atmospheric pressure. When an air leak occurs, the pressure in the negative pressure pipe 64 approaches the atmospheric pressure, so that the adsorption capacity using the entire suction opening 66 of the mounting table 10 is lowered, and the ability to regulate the curvature of the recording sheet 50 in a chained manner. And the lift of the recording sheet 50 is deteriorated.

When the lift is worsened, the air leak is also worsened. Therefore, the suction capability using the entire suction opening 66 of the mounting table 10 is lowered, and the recording sheet 50 described above can be placed on the mounting surface 10f of the mounting table 10 only. Problems similar to the configuration occur.
In order to solve such a problem with the conventional printer 100, the printer 100 according to the present embodiment includes a liquid suction unit to be described later as the recording medium suction unit. Thereby, it is set as the structure which ensures the adsorption force more effective than before in the step which mounts the recording sheet 50 before printing operation in the mounting base 10. FIG.

[Example 1]
A first embodiment of the printer 100 to which the present invention is applied (hereinafter referred to as “embodiment 1”) will be described below.
FIG. 1 is an explanatory diagram of the printer 100 according to the first embodiment. FIG. 1A is a schematic cross-sectional view of the entire printer 100, and FIG. 1B is a diagram illustrating the recording medium mounting device 200 according to the first embodiment. It is an expanded sectional view near the mounting surface recess 13 provided on the mounting surface 10f of the mounting table 10 provided.
FIG. 4 is an explanatory perspective view of the printer 100 according to the first embodiment. Since FIG. 1 is a schematic diagram, for convenience, the head unit 6 and the UV lamp 8 are integrally attached, and a configuration in which the head unit 6 and the UV lamp 8 are integrally moved is shown. FIG. 4 shows a configuration in which the head unit 6 and the UV lamp 8 are provided separately, and a UV lamp Y-axis device 8a that moves the UV lamp 8 in the Y-axis direction and an auxiliary beam 2a that supports the UV lamp Y-axis device 8a. .

  Since the configuration other than the recording medium mounting device 200 in the printer 100 according to the first embodiment has been described with reference to FIGS. 2 and 3, only the recording medium mounting device 200 that is a characteristic part of the first embodiment will be described. .

The recording medium mounting apparatus 200 is provided with a plurality of mounting surface recesses 13 which are recesses on the mounting surface 10 f of the mounting table 10. Further, the suction liquid supply functioning as both the liquid supply means for supplying the adsorption liquid 11 to the placement surface recess 13 and the liquid suction means for sucking the adsorption liquid 11 in the placement surface recess 13. A suction device 400 is provided.
Further, the recording medium mounting apparatus 200 includes an adsorption liquid tank 20 that is a liquid storage section that stores the adsorption liquid 11 supplied to the placement surface recess 13 by the adsorption liquid supply / suction apparatus 400. Furthermore, a temperature control unit 28 and a heat exchanger 26 are provided as liquid temperature control means for controlling the temperature of the adsorption liquid 11 stored in the adsorption liquid tank 20.

  Here, the case where the adsorption liquid 11 in the adsorption liquid tank 20 is cooled will be described. A temperature detector 27 is installed in the liquid in the adsorption liquid tank 20 to detect the current temperature of the adsorption liquid 11 with respect to a desired liquid temperature. An evaporator 26b is wound around the outer periphery of the adsorption liquid tank 20, and the refrigerant 26a cooled by the heat exchanger 26 flows through the evaporator 26b, whereby the adsorption liquid 11 in the adsorption liquid tank 20 is obtained. Is cooled. When the temperature control unit 28 determines that the desired temperature has been reached by the temperature detector 27, the flow of the refrigerant 26a in the evaporator 26b is stopped and the operation of the heat exchanger 26 is also interrupted.

In the heat exchanger 26 connected to the evaporator 26b, a compressor 26d, a dryer 26f, and a condenser 26e are connected by a refrigerant pipe 26c, and a capillary tube 26g is installed in the middle of the refrigerant pipe 26c. Yes.
Although an apparatus using the heat exchanger 26 is shown as an example of the liquid temperature control means, the present invention is not limited to this, such as using a heat absorbing action of a Peltier element.

  In this configuration, the refrigerant 26a is circulated so as to be pressurized by the compressor 26d toward the condenser 26e through the refrigerant pipe 26c between the heat exchanger 26 and the evaporator 26b. As a result, the refrigerant 26a cooled by the condenser 26e goes to the evaporator 26b and is cooled by the evaporator 26b, so that the adsorption liquid 11 in the adsorption liquid tank 20 in which the evaporator 26b is arranged on the outer periphery is cooled. Is done.

  On the other hand, the refrigerant 26a is circulated so as to be pressurized to the evaporator 26b by the compressor 26d, so that the heated refrigerant 26a goes to the evaporator 26b and heats the adsorption liquid 11 in the adsorption liquid tank 20. Is possible. However, in the recording medium mounting apparatus 200 according to the first embodiment, the heater 24 is installed in the adsorption liquid 11 in the adsorption liquid tank 20, and the heater 24 is used when the temperature of the adsorption liquid 11 is low. It is also possible to control so that the adsorption liquid 11 is heated directly and maintained at a desired temperature.

  An air pump 21 is connected to the adsorption liquid tank 20 via a three-way valve 22. When supplying the adsorbing liquid 11 to the mounting surface recess 13, the three-way valve 22 is switched so that the adsorbing liquid tank 20 and the air pump 21 communicate with each other, and the air pump 21 is operated to operate the inside of the adsorbing liquid tank 20. So that positive pressure is applied. Accordingly, the adsorption liquid 11 in the adsorption liquid tank 20 is fed to the liquid feeding pipe 12 in the mounting table 10 through the liquid feeding tube 23 that communicates with the adsorption liquid 11 in the adsorption liquid tank 20. Then, the adsorption liquid 11 is fed from the liquid distribution pipes 18 provided at a plurality of places to the liquid feed opening 15 communicating with the placement surface recess 13 provided on the placement surface 10 f, and the placement surface recess 13. Is filled with the adsorption liquid 11, and the air pump 21 is temporarily stopped.

When the recording sheet 50 is placed on the placement surface 10 f of the placement table 10, the lower surface of the recording sheet 50 touches the adsorption liquid 11 filled in the placement surface recess 13. At this time, the temperature of the recording sheet 50 is changed by touching the adsorption liquid 11 which is controlled by the liquid temperature control means and reaches a desired liquid temperature.
In addition, the temperature state of the mounting table 10 is detected by providing the mounting table temperature detector 16 in the mounting table 10. The temperature control unit 28 controls the inside of the adsorption liquid tank 20 that is controlled using the heat exchanger 26 so as to prevent the temperature of the adsorption liquid 11 fed to the mounting surface recess 13 from greatly deviating from a desired temperature. The temperature of the adsorption liquid 11 is controlled. For this reason, the temperature control unit 28 performs in advance a calculation for determining the temperature target value of the adsorption liquid 11 in the adsorption liquid tank 20.

After the recording sheet 50 is placed on the placing table 10, the air pump 21 of the adsorption liquid supply / suction device 400 is operated so that the inside of the adsorption liquid tank 20 is negatively charged. At this time, since the recording sheet 50 of the mounting table 10 is in close contact, the suction liquid 11 filled in the mounting surface recess 13 is discharged from the liquid feeding opening 15, thereby generating a negative pressure and recording. A strong adsorption force acts on the sheet 50.
Further, in the configuration in which the adsorption liquid 11 is sucked with the lower surface of the recording sheet 50 wet, even if a slight gap is generated between the lower surface of the recording sheet 50 and the placement surface 10f, the viscosity is higher than that of air. The adsorbing liquid 11 is in a state of closing the gap. It is possible to suppress the occurrence of air leaks caused by the primary lifting of the recording sheet 50.

  At this time, assuming that the rigidity of the recording sheet 50 is low and the area of the mounting surface concave portion 13 is too large, the rigidity of the recording sheet 50 may be locally deformed due to the suction force. . As a configuration for preventing such local deformation, the mounting surface recess 13 is provided with a spacer protrusion 14. By aligning the height of the spacer protrusion 14 with the height of the mounting surface 10f of the mounting table 10, the recording sheet 50 is prevented from being sucked and deformed with an area of the mounting surface recess 13 larger than necessary. .

After the printing operation on the recording sheet 50 is completed, the recording sheet 50 cannot be easily removed if the suction force of the mounting table 10 remains strong. Therefore, it is necessary to return the negative pressure in the suction liquid tank 20 to atmospheric pressure. is there. For this reason, after the printing operation on the recording sheet 50 is completed, the air release valve 19 of the three-way valve 22 provided between the adsorption liquid tank 20 and the air pump 21 is opened. Thereby, adsorption | suction of the recording sheet 50 to 10 f of mounting surfaces can be cancelled | released.
The printed matter on which the image is formed on the recording sheet 50 by the printer 100 is printed on ink such as a plate-like sheet or a web-like film made of a non-permeable polymer material, for example, advertising billboards, home appliances and vehicles. It can be used for operation panels and display panels for driving.

  The recording medium mounting apparatus 200 according to the first embodiment is not based on the conventional vacuum suction method, but stores the suction liquid 11 in the mounting surface recess 13 provided on the mounting table 10 and then sucks it to record the recording sheet. Wet the lower surface of 50 to increase the adsorption power. Thereby, the flatness of the recording sheet 50 can be ensured, and the occurrence of the above-described problems caused by the curling of the recording sheet 50 can be suppressed.

In the recording medium mounting apparatus 200 of Example 1, the back surface of the recording sheet 50 which is a recording medium is the adsorption liquid 11 whose temperature is controlled by the liquid temperature control means including the temperature control unit 28 and the heat exchanger 26. Wet directly. Thereby, the temperature rise of the recording sheet 50 can be suppressed and the occurrence of curling of the recording sheet 50 can be suppressed.
Further, since the suction liquid 11 in the mounting surface recess 13 is sucked from the suction liquid supply / suction device 400 as a liquid suction means, the suction force of the recording sheet 50 can be sucked stronger than the conventional vacuum suction. Thereby, it is possible to prevent the recording sheet 50 from being lifted from the mounting table 10 even when an internal distortion occurs in the curling of the recording sheet 50 due to the influence of heat rays during ultraviolet irradiation.
Since curling of the recording sheet 50 can be suppressed and lifting when curling occurs can be suppressed, so that troubles such as rubbing between the recording sheet 50 and the head unit 6 due to curling and rubbing with the UV lamp 8 can be prevented. An effect is obtained.

In the case of a configuration in which the recording medium is adsorbed by sucking air, if a gap is temporarily generated between the recording medium and the surface of the mounting portion, an air leak is generated in which pressure is released from the gap. . When the air leak occurs, the force for attracting the recording medium is weakened, and the recording medium may be lifted from the mounting portion.
On the other hand, in the configuration of the first embodiment, the adsorption liquid 11 having a viscosity higher than that of air is interposed between the recording sheet 50 as a recording medium and the mounting surface 10f as a mounting portion. For this reason, even if a gap is temporarily formed between the recording sheet 50 and the placement surface 10f, if the gap is small, the adsorbing liquid 11 is interposed in the gap and air leakage occurs. Can be suppressed.

Although not shown in the drawing, when a vacuum suction system using a mounting table equipped with a cooling device is considered, the recording medium is cooled via the cooled mounting table. However, when heat absorption is performed on the recording medium from the mounting surface of the mounting table, the contact area with respect to the smoothness between the mounting table material and the recording medium greatly affects.
In the conventional vacuum suction method, only the convex portions on the surface of the recording medium having microscopic irregularities are point contacts in contact with the mounting table as the heat absorbing material.
On the other hand, in the liquid adsorption method of Example 1, the liquid penetrates into the gap by capillary force and fills the gap, and the heat absorbing material is used not only in the convex portion on the surface of the recording medium having microscopic irregularities but also in the concave portion. A liquid comes into contact. Since the entire surface of the recording medium with microscopic irregularities can be in contact with the endothermic material, the thermal conductivity can be increased more than that of the point contact, and the effect of cooling the recording medium more efficiently can be obtained. It is done.

  Further, by holding the recording sheet 50 by the recording medium mounting apparatus 200 of Example 1 during image formation, the position of the recording sheet 50 on the mounting table 10 is fixed, and stable image formation can be performed.

In the printer according to the first embodiment, the recording sheet 50 placed on the placement table 10 serving as a placement unit is a liquid non-permeable sheet material that does not allow liquid to penetrate.
When a liquid is brought into contact with a sheet material that is infiltrated with liquid, such as general paper, the liquid penetrates into the sheet material and the sheet material becomes weak, and the sheet material may be damaged during suction or conveyance. On the other hand, in Example 1, since the liquid-impermeable recording sheet 50 is used as the sheet material, the waist of the sheet material does not decrease even when the liquid is brought into contact with the sheet material.
Examples of the liquid-impermeable sheet material include various papers, various fabrics, and various nonwoven fabrics that have been subjected to liquid-impermeable surface treatment, resin films, sheet-like metals, glass, and the like. Further, the shape of the recording sheet 50 is not limited to a cut sheet shape, but can be applied to a roll shape.

In the printer 100 according to the first embodiment, the operation of placing the recording sheet 50 on the mounting table 10 and the operation of taking out the recording sheet 50 from the mounting table 10 are performed by the user's hand. Thus, when the recording sheet 50 is conveyed by the user's hand, even if the liquid penetrates the sheet material and the waist of the sheet material becomes weak, the user is careful to prevent the sheet material from being damaged. Therefore, a sheet material that absorbs liquid can also be used.
In the printer 100 according to the first embodiment, the recording sheet 50 is placed on the placement table 10 by a user's hand, but the sheet material placement device automatically conveys the sheet material to the placement unit by the conveying unit. However, the present invention is applicable.
In a device that automatically conveys sheet material, and the device that may cause poor conveyance if the stiffness of the sheet material is weak, limit the sheet material to be used to liquid non-permeable sheet material that does not allow liquid to penetrate. It is desirable.

[Example 2]
Hereinafter, a second embodiment (hereinafter referred to as “embodiment 2”) of the printer 100 to which the present invention is applied will be described.
FIG. 5 is an explanatory diagram of the printer 100 according to the second embodiment. FIG. 5A is a schematic cross-sectional view of the entire printer 100. FIG. 5B is a diagram illustrating the recording medium mounting device 200 according to the second embodiment. It is an expanded sectional view near the mounting surface recess 13 provided on the mounting surface 10f of the mounting table 10 provided. FIG. 6 is an enlarged perspective view of the mounting surface recess 13.
Since the configuration other than the recording medium mounting apparatus 200 in the printer 100 of the second embodiment has been described with reference to FIGS. 2 and 3, only the recording medium mounting apparatus 200 that is a characteristic part of the second embodiment will be described. .

In the recording medium mounting apparatus 200 according to the second embodiment, the recording sheet 50 mounted on the mounting table 10 serving as a mounting portion is a liquid-impermeable sheet material as in the first embodiment.
The recording medium mounting apparatus 200 is provided with a plurality of mounting surface recesses 13 which are recesses on the mounting surface 10 f of the mounting table 10. Further, an adsorption liquid supply device 300 that is a liquid supply unit that supplies the adsorption liquid 11 to the mounting surface recess 13 and an adsorption liquid that is a liquid suction unit that sucks the adsorption liquid 11 in the mounting surface recess 13. A suction device 500 is provided.
The recording medium mounting apparatus 200 according to the second embodiment includes an adsorption liquid tank 20 that is a liquid storage unit that stores the adsorption liquid 11 that the adsorption liquid supply apparatus 300 supplies to the mounting surface recess 13. Furthermore, a temperature control unit 28 and a heat exchanger 26 are provided as liquid temperature control means for controlling the temperature of the adsorption liquid 11 stored in the adsorption liquid tank 20.

  In the mounting surface recess 13 of the recording medium mounting apparatus 200 according to the second embodiment, a liquid feeding opening 15 and a liquid recovery opening 17 are individually provided. The liquid feed opening 15 is a liquid supply port through which the adsorbing liquid supply device 300 supplies the adsorbing liquid 11 in the adsorbing liquid tank 20, and the adsorbing liquid suction device 500 is placed in the liquid recovery opening 17. It is a liquid suction port for sucking the adsorption liquid 11 in the surface recess 13. Further, the adsorption liquid suction device 500 includes a recovery adsorption liquid tank 30 that stores the adsorption liquid 11 sucked from the mounting surface recess 13, and the recovery adsorption liquid tank 30 includes a recovery-side air release valve 32. .

  Here, the case where the adsorption liquid 11 in the adsorption liquid tank 20 is cooled will be described. A temperature detector 27 is installed in the liquid in the adsorption liquid tank 20 to detect the current temperature of the adsorption liquid 11 with respect to a desired liquid temperature. An evaporator 26b is wound around the outer periphery of the adsorption liquid tank 20, and the refrigerant 26a cooled by the heat exchanger 26 flows through the evaporator 26b, whereby the adsorption liquid 11 in the adsorption liquid tank 20 is obtained. Is cooled. When the temperature control unit 28 determines that the desired temperature has been reached by the temperature detector 27, the flow of the refrigerant 26a in the evaporator 26b is stopped and the operation of the heat exchanger 26 is also interrupted.

  In the heat exchanger 26 connected to the evaporator 26b, a compressor 26d, a dryer 26f, and a condenser 26e are connected by a refrigerant pipe 26c, and a capillary tube 26g is installed in the middle of the refrigerant pipe 26c. Yes.

In the heat exchanger 26 connected to the evaporator 26b, a compressor 26d, a dryer 26f, and a condenser 26e are connected by a refrigerant pipe 26c, and a capillary tube 26g is installed in the middle of the refrigerant pipe 26c. Yes.
Although an apparatus using the heat exchanger 26 is shown as an example of the liquid temperature control means, the present invention is not limited to this, and other methods such as using a Peltier element's endothermic action may be used.

  In this configuration, the refrigerant 26a is circulated so as to be pressurized by the compressor 26d toward the condenser 26e through the refrigerant pipe 26c between the heat exchanger 26 and the evaporator 26b. As a result, the refrigerant 26a cooled by the condenser 26e goes to the evaporator 26b and is cooled by the evaporator 26b, so that the adsorption liquid 11 in the adsorption liquid tank 20 in which the evaporator 26b is arranged on the outer periphery is cooled. Is done.

  On the other hand, the refrigerant 26a is circulated so as to be pressurized to the evaporator 26b by the compressor 26d, so that the heated refrigerant 26a goes to the evaporator 26b and heats the adsorption liquid 11 in the adsorption liquid tank 20. Is possible. However, in the recording medium mounting apparatus 200 of the second embodiment, the heater 24 is installed in the adsorption liquid 11 in the adsorption liquid tank 20, and the heater 24 is used when the temperature of the adsorption liquid 11 is low. It is also possible to control so that the adsorption liquid 11 is heated directly and maintained at a desired temperature.

  An air pump 21 is connected to the adsorption liquid tank 20 via a three-way valve 22. When supplying the adsorbing liquid 11 to the mounting surface recess 13, the three-way valve 22 is switched so that the adsorbing liquid tank 20 and the air pump 21 communicate with each other, and the air pump 21 is operated to operate the inside of the adsorbing liquid tank 20. So that positive pressure is applied. Thus, the adsorption liquid 11 in the adsorption liquid tank 20 is fed to the supply liquid feeding pipe 12 a in the mounting table 10 through the liquid feeding tube 23 communicating with the adsorption liquid 11 in the adsorption liquid tank 20. . Then, the adsorbing liquid 11 is fed from the supply liquid distribution pipes 18a provided at a plurality of locations to the liquid feed opening 15 communicating with the placement surface recess 13 provided on the placement surface 10f. The air pump 21 is temporarily stopped while 13 is filled with the adsorption liquid 11.

When the recording sheet 50 is placed on the placement surface 10 f of the placement table 10, the lower surface of the recording sheet 50 touches the adsorption liquid 11 filled in the placement surface recess 13. At this time, the temperature of the recording sheet 50 is changed by touching the adsorption liquid 11 which is controlled by the liquid temperature control means and reaches a desired liquid temperature.
In addition, the temperature state of the mounting table 10 is detected by providing the mounting table temperature detector 16 in the mounting table 10. The temperature control unit 28 controls the inside of the adsorption liquid tank 20 that is controlled using the heat exchanger 26 so as to prevent the temperature of the adsorption liquid 11 fed to the mounting surface recess 13 from greatly deviating from a desired temperature. The temperature of the adsorption liquid 11 is controlled. For this reason, the temperature control unit 28 performs in advance a calculation for determining the temperature target value of the adsorption liquid 11 in the adsorption liquid tank 20.

  After the recording sheet 50 is placed on the placing table 10, the liquid pump 31 of the adsorption liquid suction device 500 is operated. The collection liquid feeding tube 29 connected to the liquid pump 31 flexibly connects the collection liquid feeding pipe 12 b in the mounting table 10 and the liquid pump 31 provided outside the mounting table 10. A collection liquid collecting pipe 18b is provided at a plurality of locations of the collection liquid feeding pipe 12b, and each collection liquid collecting pipe 18b communicates with a liquid collection opening 17 provided in each of the plurality of mounting surface recesses 13. doing.

When the liquid pump 31 is operated, the liquid pump 31 sucks the adsorbing liquid 11 in the collecting liquid feeding tube 29 so as to send the liquid to the collecting adsorption liquid tank 30. The adsorbing liquid 11 in the liquid pipe 12b is sucked. Thereby, the adsorption liquid 11 in the mounting surface recess 13 is discharged from the liquid recovery opening 17 connected to the recovery liquid feeding pipe 12b via the recovery liquid collecting pipe 18b.
At this time, since the recording sheet 50 of the mounting table 10 is in close contact, the suction liquid 11 filled in the mounting surface recess 13 is discharged from the liquid recovery opening 17, thereby generating a negative pressure and recording. A strong adsorption force acts on the sheet 50.
Further, in the configuration in which the adsorption liquid 11 is sucked with the lower surface of the recording sheet 50 wet, even if a slight gap is generated between the lower surface of the recording sheet 50 and the placement surface 10f, the viscosity is higher than that of air. The adsorbing liquid 11 is in a state of closing the gap. It is possible to suppress the occurrence of air leaks caused by the primary lifting of the recording sheet 50.

  At this time, assuming that the rigidity of the recording sheet 50 is low and the area of the mounting surface concave portion 13 is too large, the rigidity of the recording sheet 50 may be locally deformed due to the suction force. . As a configuration for preventing such local deformation, the mounting surface recess 13 is provided with a spacer protrusion 14. By aligning the height of the spacer protrusion 14 with the height of the mounting surface 10f of the mounting table 10, the recording sheet 50 is prevented from being sucked and deformed with an area of the mounting surface recess 13 larger than necessary. .

  After the printing operation on the recording sheet 50 is completed, the recording sheet 50 cannot be easily removed if the adsorption force of the mounting table 10 remains strong. Therefore, it is necessary to return the negative pressure acting on the mounting surface recess 13 to atmospheric pressure. There is. For this reason, after the printing operation on the recording sheet 50 is completed, the air release valve 19 of the three-way valve 22 provided between the adsorption liquid tank 20 and the air pump 21 is opened. Thereby, the suction liquid 11 in the suction liquid tank 20 is supplied to the placement surface recess 13 by the negative pressure acting on the placement surface recess 13, and the action of the negative pressure in the placement surface recess 13 is eliminated. The adsorption of the recording sheet 50 to the placement surface 10f can be released.

As in the first embodiment, the recording medium mounting apparatus 200 according to the second embodiment can suppress the curling of the recording sheet 50 and suppress the lifting when the curling occurs. For this reason, an effect of preventing a trouble caused by rubbing between the recording sheet 50 and the head unit 6 due to curling or rubbing with the UV lamp 8 can be obtained.
Further, in the printer 100 according to the second embodiment, the liquid feeding opening 15 and the liquid recovery opening 17 are individually provided in the mounting surface recess 13, so that the recording sheet 50 is adsorbed by the adsorbing liquid 11. During the adsorption, the adsorption liquid 11 in the mounting surface recess 13 can be made to flow. For this reason, the cooling effect | action can be improved by cooling the to-be-adsorbed surface (lower surface) of the recording sheet 50 with the adsorption liquid 11 cooled at any time.
In addition, as a structure for flowing the adsorption liquid 11 in the mounting surface recess 13 during the adsorption, the liquid pump 31 is continuously operated while the pressure in the adsorption liquid tank 20 is kept lower than the atmospheric pressure. It is feasible.

Example 3
A third embodiment of the printer 100 to which the present invention is applied (hereinafter referred to as “embodiment 3”) will be described below.
FIG. 7 is a schematic cross-sectional view of the entire printer 100 according to the third embodiment. FIG. 8 is a perspective explanatory view of the printer 100 according to the third embodiment. Since FIG. 7 is a schematic diagram, for convenience, the head unit 6 and the UV lamp 8 are integrally attached, and a structure in which the head unit 6 and the UV lamp 8 are integrally moved in the Y-axis direction is shown. FIG. 8 shows a configuration in which the head unit 6 and the UV lamp 8 are provided separately, and a UV lamp Y-axis device 8a that moves the UV lamp 8 in the Y-axis direction and an auxiliary beam 2a that supports the UV lamp Y-axis device 8a. .
The recording medium mounting device 200 provided in the printer 100 of the third embodiment includes a circulation tube that connects the recovered adsorption liquid tank 30 of the adsorption liquid suction device 500 and the adsorption liquid tank 20 of the adsorption liquid supply device 300. 33 and the circulation adjustment valve 34 are different from the second embodiment. Since other points are common, the description of the common configuration is omitted, and only the difference is described.

In the recording medium mounting apparatus 200 according to the third embodiment, one end is disposed in the liquid in the recovery adsorption liquid tank 30 and the other end is connected to the adsorption liquid tank 20 via the circulation adjustment valve 34. A circulation tube 33 which is a connected liquid supply path is provided, and a circulation path of the adsorption liquid 11 is formed.
With such a configuration, the adsorption liquid 11 recovered by the liquid pump 31 to the recovery adsorption liquid tank 30 can be circulated to the adsorption liquid tank 20 via the circulation tube 33.

  In the third embodiment, in order to open the placement surface recess 13 and discharge the adsorption liquid 11 separately from the liquid feeding opening 15 communicating and opening with the adsorption liquid tank 20 communicating with the placement surface recess 13. The liquid recovery opening 17 is provided. Furthermore, a recovery adsorption liquid tank 30 is provided which is a recovery liquid storage means for storing the adsorption liquid 11 sucked by the liquid pump 31 which is a negative pressure generating means for applying a negative pressure to the liquid recovery opening 17. And the collection | recovery adsorption | suction liquid tank 30 which stores the adsorption | suction liquid 11 collect | recovered from the liquid collection | recovery opening part 17, and the adsorption | suction liquid tank which stores the adsorption | suction liquid 11 supplied to the mounting surface recessed part 13 from the liquid sending opening part 15 20 is connected to the circulation tube 33. Then, by appropriately opening and closing the circulation adjusting valve 34, the adsorption liquid 11 in the recovery adsorption liquid tank 30 can be returned to the adsorption liquid tank 20, and the adsorption liquid 11 can be circulated.

  In order for the adsorbing liquid 11 to generate a sufficient adsorbing force with respect to the recording sheet 50 at the mounting surface recess 13, the internal pressure of the mounting surface recess 13 must always be negative, and the liquid feed opening The fluid resistance on the upstream side of the portion 15 needs to be determined stably. For this reason, in the third embodiment, as shown in FIGS. 7 and 8, a circulation adjustment valve 34 is provided in the middle of the liquid supply path from the circulation tube 33 to the adsorption liquid tank 20. It is possible to adjust the fluid resistance by adjusting the degree of opening and closing of the circulation adjustment valve 34.

In the recording medium mounting apparatus 200 according to the third embodiment, the adsorption liquid 11 that has returned from the collected adsorption liquid tank 30 to the adsorption liquid tank 20 is converted into a heat exchanger 26 that uses an evaporator 26b that is liquid temperature control means, Then, it is stored at a desired liquid temperature by the heater 24 or the like. Then, the liquid is again fed to the mounting surface recess 13 of the mounting table 10, and the adsorption action can be maintained while controlling the temperature of the recording sheet 50.
In the recording medium mounting apparatus 200 according to the third embodiment, the recording sheet 50 is adsorbed and cooled to the adsorbing liquid tank 20 while the adsorbing liquid 11 whose temperature has been increased is recovered and cooled. it can. For this reason, the effect which can obtain a further higher cooling action is obtained by raising the flow rate of the adsorption liquid 11 as needed, without worrying about the consumption of the adsorption liquid 11.

Example 4
Hereinafter, a fourth embodiment of the printer 100 to which the present invention is applied (hereinafter referred to as “embodiment 4”) will be described.
FIG. 9 is an enlarged cross-sectional view of the vicinity of the mounting surface recess 13 provided on the mounting surface 10f of the mounting table 10 included in the recording medium mounting apparatus 200 of Example 4, and FIG. FIG. 9B is an explanatory diagram when the recording sheet 50 is placed.
Since Example 4 is common to Example 1 except for the configuration in the vicinity of the mounting surface recess 13, description of the common configuration is omitted, and only the differences are described.

The recording medium mounting apparatus 200 according to the fourth embodiment has a flexible shape having a shape that continuously surrounds the periphery of the mounting surface recess 13 on the mounting surface 10f and that protrudes beyond the mounting surface 10f. A seal member 67 which is an elastic member made of a material is provided.
Before the recording sheet 50 shown in FIG. 9A is placed, the seal member 67 is in a free state. When the recording sheet 50 shown in FIG. 9B is placed, the seal member 67 is placed in the recording sheet 50. Is pressed and elastically deformed from above.

  As shown in FIG. 9A, the flexible distal end portion of the seal member 67 has a shape protruding from the portion around the placement surface recess 13 in the placement surface 10f in a free state. When the recording sheet 50 is placed, as shown in FIG. 9B, the flexible leading end portion of the seal member 67 is elastically deformed, and this flexible leading end portion is the lower surface of the recording sheet 50. In continuous contact. Thereby, it is possible to form a more sealed space than the configuration in which the placement surface 10 f is in contact with the recording sheet 50 around the placement surface recess 13.

  When the mounting surface recess 13 is filled with the adsorption liquid 11 in the sealed state and a negative pressure is generated by the liquid suction means (“adsorption liquid supply / suction device 400” in the first embodiment), a seal is formed. The member 67 functions like a suction cup. As a result, the recording sheet 50 can be adsorbed more strongly, and an air leak that occurs when a part of the air sucked by the vacuum pump 60 shown in the conventional example is not sealed. It works to prevent falling into a lack of adsorption power.

  In the fourth embodiment, when the recording sheet 50 is placed, and when the recording sheet 50 is sucked and adhered by being filled with the adsorption liquid 11 in the placement surface recess 13, the seal member 67 is The recording sheet 50 is deformed by an attractive force acting on the recording sheet 50. The inner region and the outer region that are continuously surrounded by the seal member 67 are closed (sealed).

  Further, the inside of the mounting surface recess 13 is filled with the adsorption liquid 11 having a desired temperature so that the temperature control for the recording sheet 50 can be performed. For this reason, more heat is applied to the recording sheet 50 than point contact on the mounting surface 10f by air suction (the mounting surface 10f and the recording sheet 50 are in contact with each other but are in store contact from a microscopic viewpoint). It has the effect of greatly improving conductivity.

In the fourth embodiment, by providing the sealing member 67 arranged in a shape that continuously surrounds the periphery of the mounting surface recess 13, the sealed space is within a range in which the recording sheet 50 can follow even if the smoothness is somewhat poor. Can be formed. For this reason, even if the smoothness of the surface of the recording sheet 50 is somewhat poor, it is possible to cope with it, and an effect of being able to handle more types of recording sheets 50 is obtained.
Note that the configuration of the fourth embodiment is applicable not only to the recording medium mounting apparatus 200 of the first embodiment but also to the recording medium mounting apparatus 200 of the second or third embodiment.

Example 5
The fifth embodiment (hereinafter referred to as “embodiment 5”) of the printer 100 to which the present invention is applied will be described below.
FIG. 10 is an enlarged cross-sectional view of the vicinity of a portion where the pressing roller 68 of the mounting table 10 provided in the recording medium mounting apparatus 200 of Example 5 is arranged.
As shown in FIG. 10, the recording medium mounting apparatus 200 of Example 5 includes a pressing roller 68 above the mounting table. Since the fifth embodiment is common to the first embodiment except that the pressing roller 68 as a pressing unit is provided, the description of the common configuration will be omitted, and only the difference will be described.
In FIG. 10, for the sake of convenience, the diameter of the pressing roller 68 is drawn to be narrower than the width of the mounting surface recess 13, but the pressing roller 68 is a member having a sufficiently large diameter with respect to the mounting surface recess 13. is there.

In the printer 100 of the fifth embodiment, after the recording sheet 50 before printing is placed on the placing table 10, as shown in FIG. 10, the pressing roller 68 is pressed from above the recording sheet 50 (from the position indicated by the two-dot chain line). Press down and press. Thereafter, the mounting table 10 is moved in the direction of the arrow in FIG. At this time, the pressing roller 68 is driven and rotated by the operation of the mounting table 10.
By pressing the recording sheet 50 with the pressing roller 68 in the state where the mounting surface recess 13 is filled with the adsorption liquid 11, the adhesion of the recording sheet 50 to the mounting surface 10 f is enhanced. Even if the pressing roller 68 is placed on the mounting table 10 and is difficult to adhere due to the curl of the recording sheet 50 itself, the adhesion of the recording sheet 50 to the mounting surface 10f can be improved.

  In the recording medium mounting device 200 provided in the printer 100 of the fifth embodiment, the liquid suction operation by the liquid suction means (“adsorption liquid supply / suction device 400” in the first embodiment) is performed after the adhesiveness is improved. Do. As a result, air leaks in which air flows in from the gap between the placement surface 10f and the recording sheet 50 is reduced, and it is possible to obtain an adsorption force more effectively.

The configuration of the fifth embodiment is not limited to the recording medium mounting apparatus 200 of the first embodiment, but can be applied to the recording medium mounting apparatus 200 of the second or third embodiment.
Further, as in the first embodiment, when there is only one liquid feeding opening 15 per one place of the mounting surface recess 13, the adsorption liquid is being pressed while the recording sheet 50 is being pressed by the pressing roller 68. 11 suction operations cannot be performed simultaneously. For this reason, when the filled adsorbing liquid 11 is set to be large, when the pressure roller 68 is pressed, the extra portion that has no place to go outside may overflow.

  On the other hand, if the liquid delivery opening 15 and the liquid recovery opening 17 are provided as in the second embodiment and the mounting surface recess 13 has a pair of an inlet and an outlet, the adsorption liquid 11 can be prevented from overflowing. . This is due to the following reason. That is, even if there is a large amount of the adsorption liquid 11 in the mounting surface recess 13, the adsorption liquid 11 that is pressed by the pressing roller 68 and is about to overflow can be sucked from the liquid recovery opening 17. It is possible to prevent the adsorption liquid 11 from overflowing outside the recording sheet 50.

Furthermore, even if the adsorbing liquid 11 in the mounting surface recess 13 immediately below the pressing roller 68 is in a small state, it is filled with the adsorbing liquid 11 supplied from the liquid feeding opening 15 at the same time. Suction can be performed from the liquid recovery opening 17. As a result, the air (bubbles) confined in the sealed space formed by the placement surface recess 13 and the recording sheet 50 is eventually discharged from the liquid recovery opening 17 by the flow of the adsorption liquid 11, and has a stronger suction force. It can be made to increase the adhesion.
By increasing the adhesion, the occurrence of air leak can be further suppressed.

  In the configuration of the fourth embodiment, in the configuration in which the flexible seal member 67 surrounds the outer periphery of the placement surface recess 13, the lower surface of the recording sheet 50 contacts the leading end of the seal member 67, and the seal member 67. Is elastically deformed to start sucking the recording sheet 50 like a suction cup. By combining this configuration with the configuration including the pressing roller 68 of Example 5, the amount of elastic deformation of the seal member 67 in contact with the lower surface of the recording sheet 50 increases, and the recording sheet 50 is adsorbed like a suction cup. The power to do is greater. Thereby, it becomes possible to easily lead to a close contact state.

  In the fifth embodiment, by providing the pressing roller 68, it is possible to prevent air leak and to assist in effectively bringing the recording sheet 50 into close contact with the mounting table 10 from the initial stage of liquid adsorption. Thereby, the effect which can improve the reliability of contact | adherence effect | action is acquired.

Example 6
A sixth embodiment (hereinafter referred to as “embodiment 6”) of the printer 100 to which the present invention is applied will be described below.
FIG. 11 is a schematic cross-sectional view of the entire printer 100 according to the sixth embodiment. The printer 100 of Example 6 includes two adsorption liquid supply devices 300, a first adsorption liquid supply device 300a and a second adsorption liquid supply device 300b, and includes a first heat exchanger 261 and a second heat exchanger. The second embodiment is different from the second embodiment in that two heat exchangers 26 are provided. Since other points are common, description of the common configuration will be omitted, and only differences will be described.

  In Example 6, as shown in FIG. 11, among the plurality of placement surface recesses 13 arranged on the placement surface 10f, the first placement surface recess 13a facing the central portion of the recording sheet 50, and its peripheral portion The second mounting surface recess 13b is divided into two systems. In FIG. 11, among the nine placement surface recesses 13 arranged in the sub-scanning direction, the three places at the center are the first placement surface recesses 13 a and the three left and right places are the second placement surface recesses 13 b. Yes.

The first adsorption liquid supply device 300a supplies the first adsorption liquid 11a to the central first mounting surface recess 13a, and the temperature of the first adsorption liquid 11a is controlled first. This is a heat exchanger 261. On the other hand, it is the second adsorption liquid supply device 300b that supplies the second adsorption liquid 11b to the peripheral second placement surface recess 13b, and the temperature of the second adsorption liquid 11b is controlled. This is a second heat exchanger 262.
As described above, since the liquid supply means and liquid temperature control means in the central part and the liquid supply means and liquid temperature control means in the peripheral part are divided, the first adsorption liquid 11a and the second adsorption liquid 11b are separated. Temperature control can be performed independently, and different temperature settings are possible.

  The temperature of the first adsorbing liquid 11a in the first adsorbing liquid tank 20a fed to the central first mounting surface recess 13a is measured by the first liquid detecting unit 27a. The temperature control unit 28 controls the operation of the first compressor 261d until the first liquid detection unit 27a reaches a desired temperature, and performs feedback control so that the target liquid temperature is reached.

  Similarly, the temperature of the second adsorbing liquid 11b in the second adsorbing liquid tank 20b fed to the peripheral second mounting surface recess 13b is measured by the second liquid detecting unit 27b. The temperature controller 28 controls the operation of the second compressor 262d until the second liquid detector 27b reaches a desired temperature, and performs feedback control so that the target liquid temperature is reached.

As a result, the first adsorbing liquid 11a in the first adsorbing liquid tank 20a passes through the first liquid feeding tube 23a by the compressed air of the first air pump 21a to the first mounting surface recess 13a in the central part, It flows into one supply liquid feeding pipe 121a. Further, the first adsorption liquid 11a is distributed to the three first supply liquid distribution pipes 181a provided in the first supply liquid supply pipe 121a, and flows to the respective first liquid supply openings 15a. .
On the other hand, the second adsorbing liquid 11b in the second adsorbing liquid tank 20b is passed through the second liquid feeding tube 23b by the compressed air of the second air pump 21b to the second mounting surface recess 13b in the peripheral portion, It flows into the supply liquid supply pipe 121b. Further, the second adsorbing liquid 11b is distributed to the second three supply liquid distribution pipes 181b provided in the second supply liquid supply pipe 121b, and flows to the respective second liquid supply openings 15b. .

In the suction operation, the first adsorbing liquid 11a and the second adsorbing liquid 11b having different liquid temperatures are collected from the first liquid recovery port 17a and the second liquid recovery port 17b to the common recovery liquid feeding pipe 12b. . Then, the collected adsorption liquid 11 is flowed to the collection adsorption liquid tank 30 by the liquid pump 31 through the single collection liquid feeding tube 29 outside the mounting table 10.
In the sixth embodiment, the first adsorbing liquid 11a and the second adsorbing liquid 11b are collected by the common adsorbing liquid aspirating device 500 or the like. It may be provided. As a result, the suction path can be divided for each mounting surface recess 13 in which the supply path of the adsorption liquid 11 is divided, and only necessary portions can be sucked or the suction force can be varied depending on the position. It becomes possible.

In the sixth embodiment, the first adsorbing liquid 11a and the second adsorbing liquid 11b having different temperatures in the central portion and the peripheral portion are distributed on the mounting table 10, so that the temperature propagated to the recording sheet 50 is also distributed. be able to. As an example, for example, control of lowering the central portion than the peripheral portion can be mentioned.
Although the temperature of the recording sheet 50 increases due to the influence of heat rays radiated when the UV lamp 8 irradiates ultraviolet rays, the distortion generated in the recording sheet 50 due to expansion can be released outward at the peripheral portion, Since it is difficult to release the strain, a force is generated to form a central convex shape. At this time, by controlling the central portion to be lower in temperature than the peripheral portion, it is possible to reduce the distortion of the central portion that tends to become the above-described central convex shape, and thus it is possible to maintain the recording sheet 50 flatness.

  In addition, the UV lamp before the ink is leveled in the state where only the image first layer 51 on the surface of the recording sheet 50 or the image first layer 51 and the image second layer 52 (final image layer) have been printed. 8 may be pre-cured by irradiating ultraviolet rays with weak illuminance. After pre-curing, in order to fully cure the ink of each image layer, stronger ultraviolet irradiation energy is required. For this reason, a method of locally increasing the integrated light quantity by slowing the scanning speed of irradiation on the recording sheet 50, a method of increasing the illuminance of the UV lamp 8, or the like is employed.

When such a method is employed, only the portion irradiated with ultraviolet rays becomes extremely high, and the temperature of the recording sheet 50 at that portion increases locally, so that the expansion of the recording sheet 50 locally occurs. Since it becomes strong, distortion will also increase locally.
On the other hand, the temperature of the first adsorption liquid 11a in the first placement surface recess 13a in the center of Example 6 and the temperature of the second adsorption liquid 11b in the second placement surface recess 13b in the peripheral part Both are made sufficiently hot. Further, by increasing the temperature of the first adsorbing liquid 11a in the central part higher than the temperature of the second adsorbing liquid 11b in the peripheral part, the temperature distribution of the recording sheet 50 also becomes higher in the central part than in the peripheral part. In addition, the temperature of the adsorbing liquid 11 to be supplied is controlled in advance.

  Then, after the temperature distribution of the recording sheet 50 is in a state where the central portion becomes higher than the peripheral portion, the main curing is performed by full-scale ultraviolet irradiation on the recording sheet 50. Thereby, even if the printing surface side of the recording sheet 50 becomes high temperature by the main curing, the temperature difference between the printing surface (front surface) side and the back surface of the recording sheet 50 is already high because the back surface side is already high temperature. Get smaller. Thereby, since it becomes difficult to produce the front-back difference of distortion like a bimetal, it can suppress that the recording sheet 50 becomes a middle convex shape.

  In the recording medium mounting apparatus 200 according to the third embodiment, it is possible to independently set and control the temperature of the adsorption liquid 11 supplied to the mounting surface recesses 13 of the plurality of groups. Can be freely distributed.

The printer 100 of each of the embodiments described above is an ultraviolet curable ink jet image forming apparatus that performs image formation by ejecting ultraviolet curable ink and performs curing and fixing by irradiation with ultraviolet rays. And it has the characteristic structure in the recording medium mounting apparatus 200 which is a sheet material mounting apparatus which restrains the recording sheet 50 which is a recording medium.
Such a sheet material placing device is not limited to that used in an image forming apparatus that performs printing. It is possible to ensure the flatness of a sheet material made of a material whose flatness is likely to be hindered by transfer of heat during the process, such as active energy irradiation, coating, soldering and heat drying on the sheet material placed on the mounting table. It is applicable to the required apparatus.
Further, by controlling the temperature of the liquid sucked in contact with the sheet material, it is possible to ensure flatness while controlling the temperature of the sheet material.

  Further, in the conventional ultraviolet curable ink jet printer, it is necessary to reduce the viscosity of the ink in order to stably eject the ink from the ink jet head. In the configuration described in Patent Document 1, the ink is heated to a desired temperature higher than normal temperature in order to reduce the viscosity of the ink, and the ink heating device for reducing the viscosity and the ink heated by the ink heating device are arranged. And a recording head for discharging to a recording medium. Further, a conveying device that supports and conveys the recording medium so as to face the ejection surface of the recording head, and a recording medium upstream of the conveyance direction of the conveying device from a point where ink landed on the recording medium is cured. And a cooling device for cooling. Japanese Patent Application Laid-Open No. H10-228561 describes a method in which a Peltier element or a fragister element is used as a cooling means, and the cooling means is brought into contact with a recording medium via a cooling heat plate.

  However, the method of cooling just by bringing the recording medium to be conveyed (moved) into contact as in Patent Document 1 cannot efficiently cool the recording medium. In addition, due to the contact area (flatness of the setting surface) between the cooling heat plate and the recording medium and variations in thermal conductivity, it is impossible to obtain a uniform temperature distribution due to the cooling effect. For this reason, there is a problem that variations are caused in the effect of “improving the image quality by suppressing the spread of the ink that has landed on the recording medium by increasing the ink viscosity after landing”, which is aimed by Patent Document 1. is there.

For this reason, in order to solve such problems of the conventional technology, the recording medium before ink landing is efficiently cooled and cooled to a uniform temperature distribution state (or a uniform temperature distribution at a desired temperature). To be heated).
In contrast, in the printer 100 of each of the embodiments described above, the recording medium before ink landing can be efficiently cooled by bringing the adsorption liquid 11 into contact with the recording sheet 50 before ink ejection, and It can be cooled to a uniform temperature distribution. Further, by heating the adsorption liquid 11 using the heater 24 and the heat exchanger 26 and bringing the heated adsorption liquid 11 into contact with the recording sheet 50, the recording medium is heated to a uniform temperature distribution at a desired temperature. can do.

Patent Document 4 is an invention relating to a recording apparatus and a recording method, and an object thereof is to provide a recording apparatus that can contribute to an improvement in recording processing efficiency while suppressing the occurrence of problems in a recording medium.
In Patent Document 4, as in the case of the heat propagation to the recording sheet 50 of each of the above-described embodiments, the efficiency of heat propagation to the recording medium is a problem. However, in the configuration described in Patent Document 4, heat is propagated to a recording medium by being brought into close contact with a temperature-controlled recording medium support (corresponding to the “mounting table 10”) by an air suction device.
On the other hand, the above-described embodiments are different in that the negative pressure is generated by the liquid suction in the closed region filled with the liquid, not the negative pressure generated by the air suction, and the close contact is performed. Further, each of the embodiments described above is different from the configuration described in Patent Document 4 in that the temperature of the liquid is controlled and the recording medium is also heated and cooled.

  Patent Document 2 is an invention related to a table device and a droplet discharge device, and has a problem that radiant heat due to ultraviolet irradiation affects a recording medium as in the above-described embodiments. However, the cooling method is different in that it is air. Further, in Example 3 of Patent Document 2, the flow path is divided into a plurality of parts, which is similar to Example 6 described above. However, the sixth embodiment is a control method in which the temperature of the mounting table 10 is controlled to positively have a temperature distribution by controlling the temperature of the flowing liquid, and is not limited to the air suction method as in Patent Document 2. An unobtainable configuration can be realized.

Patent Document 3 is an invention relating to a recording apparatus, and it is an object of the present invention to make it possible to attract and hold a recording material having a large amount of curl and warp on a support surface of a recording material support portion.
In Patent Document 3, when there is no recording medium, there is an adsorption surface at a position higher than the surface of the placement section, and when there is a recording medium, the position is lower than the surface of the placement section due to adsorption force (negative pressure). The method of moving is described, and there is a point similar to the fourth embodiment described above. However, the configuration described in Patent Document 3 is air suction, whereas Example 4 is different in that it is negative pressure suction via a liquid. Further, in the configuration of the fourth embodiment, the seal member 67 is fixed in a state where the recording sheet 50 is sucked and the recording sheet 50 is removed after releasing the suction, whereas the configuration described in Patent Document 2 is used. However, they are different in that the recording medium is always attracted and slid by the attracting surface.

Patent Document 1 is an invention related to an ink jet printer, and it is an object to improve image quality by suppressing the spread of ink landed on a recording medium by increasing ink viscosity after landing.
In the configuration described in Patent Document 1, a transport device that supports and transports a recording medium so as to face the ejection surface of the recording head, and a transport device in the transport direction of the transported ink from a point where ink landed on the recording medium is cured. And a cooling device for cooling the recording medium on the upstream side.

On the other hand, in each of the above-described embodiments, the method of transferring heat to the recording medium is not a mounting table on which the recording medium is mounted, but a liquid whose temperature is controlled by being filled in a recess formed on the mounting table. The place by heat propagation is different.
Furthermore, the configurations of the above-described embodiments are not limited to cooling the recording medium, but are different in that temperature control including heating can be performed. Furthermore, the recording medium is adsorbed while being wetted by the contact surface by sucking the liquid itself as a heat medium in contact with the recording medium. For this reason, it is different in that the effect of improving the attracting force of the recording medium at the time of mounting by improving the confidentiality of the liquid while efficiently transferring the heat to the recording medium is obtained.

  Water is used as the adsorption liquid 11 used in each of the embodiments described above. Since water has a high surface tension and can easily obtain water repellency with a recording medium, it can be easily wiped off after printing, and is suitable as a familiar liquid with high specific heat and high heat transfer efficiency. In order to circulate and use such water as a heat medium for a long period of time, an antiseptic or an aqueous solution of a rust inhibitor may be included. Further, the adsorption liquid 11 is not limited to this. For example, any liquid heat medium used in a temperature control apparatus called a chiller can be used as the adsorption liquid 11 as appropriate.

What has been described above is merely an example, and the present invention has a specific effect for each of the following modes.
(Aspect A)
In a sheet material placement device such as a recording medium placement device 200 provided with a placement portion such as a placement table 10 on which a sheet material such as a recording sheet 50 is placed, a placement surface recess provided in the placement portion 13 and the like, the liquid supply means such as the adsorption liquid supply / suction device 400 or the adsorption liquid supply device 300 for supplying the liquid such as the adsorption liquid 11 to the recess, and the suction liquid supply for sucking the liquid in the recess Liquid suction means such as the suction device 400 or the suction liquid suction device 500.
According to this, as described in the embodiment, the liquid in the recess is brought into contact with the surface of the sheet material on the placement portion side, so that a slight amount between the surface of the recording medium and the surface of the placement portion can be obtained. The gap is closed by the liquid, and the surface of the recording medium and the surface of the mounting portion are in close contact with each other. In this state, by sucking the liquid in the recess, a negative pressure acts on the recess, and the recording medium can be adsorbed to the mounting portion, and the surface of the recording medium and the surface of the mounting portion are in close contact with each other. Therefore, the pressure is not released and the adsorption force can be increased as compared with the conventional case. Thereby, it is possible to suppress the recording medium from being lifted from the placement unit as compared to the conventional one in which air is sucked by the placement unit.
(Aspect B)
In the aspect A, the adsorption liquid tank 20 that stores the liquid such as the adsorption liquid 11 supplied to the concave portion such as the mounting surface concave portion 13 by the liquid supply means such as the adsorption liquid supply suction device 400 or the adsorption liquid supply device 300. And a liquid temperature control means such as a temperature control unit 28 and a heat exchanger 26 for controlling the temperature of the liquid stored in the liquid storage unit.
According to this, as described in the embodiment, it is possible to suppress the temperature increase of the sheet material such as the recording sheet 50 by using the liquid whose temperature is controlled by the liquid temperature control unit, and the sheet material resulting from the temperature increase. The occurrence of bending can be suppressed.
(Aspect C)
In the aspect B, the liquid feeding opening through which the supply means such as the adsorption liquid supply device 300 supplies the liquid such as the adsorption liquid 11 in the liquid storage unit such as the adsorption liquid tank 20 is provided in the concave portion such as the placement surface concave portion 13. The liquid supply port such as the unit 15 and the liquid suction port such as the liquid recovery opening 17 through which the suction means such as the suction liquid suction device 500 sucks the liquid in the recess are individually provided.
According to this, as described in the second embodiment, it is possible to cause the liquid in the concave portion to flow while the sheet material such as the recording sheet 50 is adsorbed by the liquid, even during the adsorption. For this reason, it becomes possible to improve a cooling effect | action by cooling the to-be-adsorbed surface of a sheet | seat material with the liquid cooled at any time.
(Aspect D)
In aspect C, the liquid such as the adsorption liquid 11 sucked from the liquid suction port such as the liquid recovery opening 17 is fed into the liquid storage part such as the adsorption liquid tank 20 and the circulation tube 33 for circulating the liquid and the circulation Liquid circulation means such as the regulating valve 34 is provided.
According to this, as described in the third embodiment, an even higher cooling effect is obtained by increasing the supply amount, such as increasing the flow rate of the liquid as necessary, without worrying about the liquid consumption. It becomes possible.
(Aspect E)
In any one of the aspects B to D, the concave portion such as the mounting surface concave portion 13, the liquid supply means such as the adsorption liquid supply device 300, the liquid storage portion such as the adsorption liquid tank 20, and the heat exchanger 26. There are a plurality of combinations with the liquid temperature control means such as, and for each combination, the liquid supply by the liquid supply means and the temperature control of the liquid in the liquid reservoir by the liquid temperature control means can be performed.
According to this, as described in the sixth embodiment, different temperature settings are possible depending on the position of the mounting portion such as the mounting table 10.
(Aspect F)
In any of the aspects A to E, the mounting portion such as the mounting table 10 has a shape that continuously surrounds the periphery of the recess such as the mounting surface recess 13 and protrudes from the surface of the mounting portion. An elastic member such as a sealing member 67 having a shape is provided.
According to this, as described in the fourth embodiment, even if the smoothness of the sheet material such as the recording sheet 50 is somewhat poor, it is possible to form a sealed space in a range where it can follow it. For this reason, even if the surface smoothness of the sheet material is somewhat poor, it can be dealt with, and more types of sheet material can be handled.
(Aspect G)
In any one of the aspects A to F, the pressing roller 68 or the like that presses the sheet material such as the recording sheet 50 mounted on the mounting unit such as the mounting table 10 from the opposite side across the mounting unit. Means.
According to this, as described in the fifth embodiment, it is possible to perform assistance for more effectively bringing the sheet material into close contact with the placement portion from the initial stage of liquid adsorption, and the reliability of the contact action can be improved. An enhanced effect is obtained.
(Aspect H)
A droplet discharge means such as a head unit 6 for dropping droplets containing an image forming substance such as ink on the surface of a recording medium such as a recording sheet 50; and a recording medium on which droplets are dropped on the surface; In an image forming apparatus such as a printer 100 having a droplet curing light beam irradiation means such as a UV lamp 8 that irradiates light such as ultraviolet rays to cure the droplet, recording is performed when the droplet discharge means drops the droplet. Aspects A to G are provided as at least one of the dropping time placing means for placing the medium and the light irradiation placing means for placing the recording medium when the droplet curing light beam irradiating means irradiates light. A sheet material placement device such as the recording medium placement device 200 according to any one of the above is used.
According to this, as described in the embodiment, when used as a mounting means during light irradiation, the mounting table 10 or the like can be used even if an internal distortion in which the recording medium is bent due to the influence of heat rays occurs during light irradiation. It is possible to suppress the recording medium from floating from the mounting portion. In addition, when used as a dropping placement device, the position of the recording medium in the placement portion is fixed, and stable image formation can be performed.

DESCRIPTION OF SYMBOLS 1 Base 2 Beam 2a Auxiliary beam 3 Y-axis linear motor 4 Y-axis scanning carrier 5 Z-axis head stage 6 Head unit 7 X-axis linear motor 8 UV lamp 8a UV lamp Y-axis device 10 Mounting table 10f Mounting surface 11 Adsorption liquid 11a First adsorbing liquid 11b Second adsorbing liquid 12 Liquid feeding pipe 12a Supply liquid feeding pipe 12b Recovery liquid feeding pipe 13 Placement surface recess 13a First placement surface recess 13b Second placement surface recess 14 Spacer projection 15a First liquid feed opening 15b Second liquid feed opening 15 Liquid feed opening 16 Mounting table temperature detector 17 Liquid recovery opening 17a First liquid recovery port 17b Second liquid recovery port 18a Supply liquid distribution pipe 18b Collected liquid assembly Pipe 18 Liquid distribution pipe 19 Atmospheric release valve 20 Adsorption liquid tank 20a First adsorption liquid tank 20b Second adsorption liquid tank 21 Air pump 21a First air pump 21b Second air pump 22 Three-way valve 23 Liquid feeding tube 23a First liquid feeding tube 23b Second liquid feeding tube 24 Heater 26 Heat exchanger 26a Refrigerant 26b Evaporator 26c Refrigerant pipe 26d Compressor 26e Condenser 26f Dryer 26g Capillary tube 27 Temperature detector 27a First liquid detection unit 27b Second liquid detection unit 28 Temperature control unit 29 Recovery liquid supply tube 30 Recovery adsorption liquid tank 31 Liquid pump 32 Recovery side air release valve 33 Circulation tube 34 Circulation adjustment valve 50 Recording sheet 51 Image first layer 52 Image second layer 60 Vacuum pump 61 Vacuum three-way valve 62 Atmospheric release portion 63 Suction tube 64 Negative pressure tube 65 Negative pressure distribution portion 66 Suction opening 67 Seal member 68 Press roller 100 Printer 121a First supply liquid supply Pipe 121b Second supply liquid supply pipe 181a First supply liquid distribution pipe 18 b Second supply liquid distribution pipe 200 Recording medium mounting device 261 First heat exchanger 261d First compressor 262 Second heat exchanger 262d Second compressor 300 Adsorption liquid supply device 300a First adsorption liquid supply device 300b Second adsorption liquid supply device 400 Adsorption liquid supply and suction device 500 Adsorption liquid suction device 600 Vacuum suction device

JP 2005-96415 A JP 2012-176573 A JP 2011-62956 A JP 2012-192676 A

Claims (8)

In the sheet material placing device provided with a placement part on which the sheet material is placed,
A recess provided in the mounting portion, and
Liquid supply means for supplying liquid to the recess;
A sheet material placing device comprising: a liquid suction means for sucking the liquid in the recess. In the sheet | seat material mounting apparatus of Claim 1,
A liquid storage section for storing the liquid supplied to the recess by the liquid supply means;
And a liquid temperature control means for controlling the temperature of the liquid stored in the liquid storage section. In the sheet | seat material mounting apparatus of Claim 2,
A liquid supply port through which the supply means supplies the liquid in the liquid storage section;
A sheet material placing device, wherein the suction means individually provides a liquid suction port for sucking the liquid in the recess. In the sheet | seat material mounting apparatus of Claim 3,
A sheet material placement device comprising: a liquid circulation means for feeding the liquid sucked from the liquid suction port into the liquid storage section and circulating the liquid. In the sheet | seat material mounting apparatus in any one of Claim 2 thru | or 4,
A plurality of combinations of the recess, the liquid supply means, the liquid reservoir, and the liquid temperature control means;
A sheet material placing device characterized in that, for each combination, liquid supply by the liquid supply means and temperature control of the liquid in the liquid storage part by the liquid temperature control means can be performed. In the sheet | seat material mounting apparatus in any one of Claims 1 thru | or 5,
A sheet material placing device, wherein the placing portion includes an elastic member having a shape that continuously surrounds the periphery of the concave portion and that protrudes from the surface of the placing portion. In the sheet | seat material mounting apparatus in any one of Claims 1 thru | or 6,
The sheet material placing apparatus according to claim 1, further comprising pressing means for pressing the sheet material placed on the placement portion from the opposite side with the placement portion interposed therebetween. Droplet discharge means for dropping droplets containing an image forming substance on the surface of the recording medium;
In an image forming apparatus having a droplet curing light beam irradiation means for irradiating the recording medium on which a droplet is dropped on the surface with a light beam to cure the droplet,
The dropping medium placing means for placing the recording medium when the droplet discharging means drops the droplet, and the recording medium is placed when the droplet curing light beam irradiating means irradiates light. An image forming apparatus using the sheet material placing device according to claim 1 as at least one of the light irradiation time placing means.

Images