JP5900382B2 - Image transfer device - Google Patents

Description

  The present invention relates to an image transfer apparatus.

  A plastic sheet that forms an image on the surface of the film by electrophotography, and laminates the core sheet with the two films by heating and pressing the laminate in which the two films are opposed to each other via the core sheet The lamination process includes an elongation preventing process for preventing the laminate from being stretched, an adhesion preventing process for heating and pressing the laminated body after the elongation preventing process, and an adhesive process, A method for producing a plastic sheet including a cooling step for cooling is known (Patent Document 1).

  An image forming process for forming an image made of an image forming material by an electrophotographic method on one side of a substrate having an image receiving layer, and an electrophotographic image forming material transfer sheet are made of ethylene glycol, terephthalic acid, and 1,4-cyclohexane diester. Positioning step of forming a laminate by superimposing the image transfer surface of the image support containing the polyester resin copolymerized with the methanol component and the surface on which the image is formed to face each other, and the positioned laminate There is also known a method for producing an image recording body, which includes a thermocompression bonding process for thermocompression bonding and a peeling process for peeling the electrophotographic image forming material transfer sheet from the image support after the image forming material is cooled (patent) Reference 2).

Japanese Patent No. 4258398 Japanese Patent No. 4525100

  The present invention suppresses surface defects while maintaining the flatness of the substrate when the laminate on which the substrate and the recording medium are laminated is heated and pressed to transfer the image on the recording medium to the substrate. Objective.

In order to solve the above problem, an image transfer apparatus according to claim 1,
A first roller pair that heats and pressurizes a substrate and a laminate in which a film having an image recorded on the surface is laminated;
A plurality of heated and pressurized second roller pairs that cool while transporting the stacked body are arranged on the downstream side in the transport direction of the stacked body of the first roller pair ,
The leading end of the laminated body is first on the downstream side in the conveying direction of the laminated body of the first roller pair.
At the timing of entering the contact portion of the second roller pair disposed at the first position.
The contact pressure of the second roller pair is lower than the contact pressure of the first roller pair,
It is characterized by that.

According to a second aspect of the present invention, in the image transfer apparatus according to the first aspect,
The leading end of the laminated body is first on the downstream side in the conveying direction of the laminated body of the first roller pair.
At the timing of entering the contact portion of the second roller pair disposed at the first position.
Further, the conveyance speed of the second roller pair is made higher than the conveyance speed of the first roller pair.
It is characterized by that.

The invention according to claim 3 is the image transfer apparatus according to claim 1 or 2,
At the timing when the rear end of the laminate is discharged from the contact portion of the first roller pair, the product
The contact pressure of the second roller pair arranged first on the downstream side in the transport direction of the layer body is the first pressure.
Lower than the contact pressure of one roller pair,
It is characterized by that.

According to a fourth aspect of the present invention, in the image transfer apparatus according to any one of the first to third aspects,
The surface of the first roller pair and the second roller pair is lower than the surface hardness of the film.
Composed of elastic body with high hardness,
It is characterized by that.

  According to the present invention, when a laminate in which a base material and a recording medium are laminated is heated and pressed to transfer an image on the recording medium to the base material, surface defects are suppressed while maintaining the flatness of the base material. be able to.

It is a cross-sectional schematic diagram which shows an example of schematic structure of the production apparatus of the laminated body to which the image transfer apparatus 30 is applied. FIG. 2A is a longitudinal sectional view showing the configuration of the image transfer apparatus 30, and FIG. 2B is a schematic sectional view of each roller constituting the image transfer apparatus 30. 3 is a block diagram showing functions provided in a control unit C of the image transfer apparatus 30. FIG. 3 is a cross-sectional configuration diagram of a laminate laminated by the image transfer device 30. FIG. 4 is a schematic cross-sectional view for explaining functions of a fixing unit and a cooling unit of the image transfer apparatus 30. FIG. 6 is a diagram for explaining an example of temperature control of cooling roller pairs 33 and 33 in the image transfer device 30. FIG. 4 is a schematic diagram for explaining the posture of a laminated body between a nip portion of a heat roller pair 32 and 32 and a nip portion of a cooling roller pair 33 and 33. FIG. 4 is a diagram for explaining an example of pressure control of a cooling roller pair in a cooling unit of the image transfer apparatus 30. FIG. It is a longitudinal cross-sectional view which shows the image transfer apparatus 200 of a comparative example.

Next, the present invention will be described in more detail with reference to the drawings with reference to embodiments and examples. However, the present invention is not limited to these embodiments and examples.
Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.

(1) Overall Configuration and Operation of Laminate Creation Device FIG. 1 is a schematic cross-sectional view showing an example of a schematic configuration of a laminate (plastic sheet) production device 100 to which the image transfer device 30 according to this embodiment is applied. is there.
The laminate manufacturing apparatus 100 includes an image forming apparatus (film storage section, image forming section) 10, a collating apparatus 20, and an image transfer apparatus (laminating section) 30.

(1.1) Image Forming Apparatus The image forming apparatus 10 includes, for example, a film tray 11, an image forming unit 12, and a conveyance path 13 that conveys a transfer film as a first medium from the film tray 11 to the image forming unit 12. And a conveyance path 15 for conveying the transfer film after image formation from the image forming unit 12 to the discharge port 14. Other configurations are omitted.

  Although not shown, the image forming unit 12 is composed of a known electrophotographic color image forming apparatus. That is, the image forming units for forming black (K), cyan (C), magenta (M), and yellow (Y) toner images on the medium and the surface of the photosensitive drum included in the image forming unit are exposed. Exposure device for forming an electrostatic latent image, developing device for developing the electrostatic latent image formed on the surface of the photosensitive drum with each color toner, transfer device for transferring the toner image formed on the surface of the photosensitive drum to the medium, and medium A fixing device for fixing the toner image transferred to the toner image by heating and pressing.

  The conveyance paths 13 and 15 are composed of a plurality of roller pairs including guide roller pairs and guides (not shown). Further, the conveyance path 15 has an inversion path 16 that reverses the conveyance direction of the transfer film by 180 °. Is provided. A gate 17 for changing the guide direction of the transfer film is provided in the vicinity of the branch between the conveyance path 15 and the reverse path 16. When the transfer film is reciprocated on the reverse path 16 and returned to the transport path 15, the transport direction of the transfer film is reversed by 180 ° and the front and back surfaces of the transfer film are reversed and transported.

(1.2) Collating Device The collating device 20 includes a card tray 22, a collating tray (positioning unit) 25, and a card substrate 1 as an example of a second medium from the card tray 22 to the collating tray 25. The conveyance path 24 is configured to be supplied, and the conveyance path 21 is configured to supply the transfer film discharged from the discharge port 14 of the image forming apparatus 10 to the collating tray 25.

A discharge portion of the conveyance path 24 that supplies the card substrate 1 to the collating tray 25 and a discharge portion of the conveyance path 21 that supplies the transfer film to the collation tray 25 are provided in parallel in the height direction.
The conveyance path 21 may be, for example, a structure provided with a smooth plate-like member and a conveyance roller for conveying the transfer film on the surface thereof, and is constituted by a rotating belt-shaped conveyance body. May be. Then, at the timing when the transfer film is discharged from the image forming apparatus 10, the transport roller and the belt rotate to transport the transfer film to the collating tray 25.

  The card tray 22 is provided with a pick-up roller and a paper feed roller that are provided in a normal paper feeding device, and at a timing immediately after the collating tray 25 is moved to the position of the discharge port of the card tray 22. A paper feed roller or the like rotates to convey the card substrate 1 to the collating tray 25.

  The collating tray 25 is configured to move up and down between the discharge units so that the card base 1 and the transfer film are respectively supplied from the discharge unit of the conveyance path 24 and the discharge unit of the conveyance path 21. Further, means (not shown) for aligning and positioning the end portions of the laminated card substrate 1, front transfer film 3, and back transfer film 5 is provided.

The collating tray 25 is provided with a temporary fixing device 26 for temporarily fixing a laminated body in which two transfer films are laminated via the card base 1. The temporary fixing device 26 is composed of, for example, a pair of protruding pieces made of metal so as to be heated by a heater or the like. By sandwiching the ends of the stacked body by the pair of heated protruding pieces, The ends are thermally welded and temporarily fixed.
When the temporary fixing device 26 is provided on the transport path of the laminated body from the collating tray 25 to the image transfer device 30, it is disposed at the end of the collating tray 25 only at the time of temporary fixing, and otherwise. Is configured to be retractable from the conveyance path.

(1.3) Image Transfer Device FIG. 2A is a longitudinal sectional view showing the configuration of the image transfer device 30 according to this embodiment, and FIG. 2B is a schematic sectional view of each roller constituting the image transfer device 30. FIG. 3 is a block diagram illustrating each function provided in the control unit C of the image transfer apparatus 30. Hereinafter, the configuration and operation of the image transfer apparatus 30 will be described with reference to the drawings.

The image transfer device 30 includes a fixing unit and a cooling unit. The fixing unit includes a pair of preheat roller pairs 31, 31 and a pair of heat roller pairs 32, 32 arranged on the downstream side of the preheat roller pair 31, 31 in the medium transport direction.
The cooling unit includes a plurality of (four pairs in the present embodiment) cooling roller pairs 33 and 33 arranged downstream of the fixing unit in the medium transport direction.
Also, there is a medium between the pre-heat roller pair 31, 31 and the heat roller pair 32, 32, between the heat roller pair 32, 32 and the cooling roller pair 33, 33, and between each cooling roller pair 33, 33. Sheet sensors S1, S2, S3, S4 and S5 are arranged as detection members.

Each of the preheating roller pair 31 and 31, the heating roller pair 32 and 32, and the cooling roller pair 33 and 33 is formed with an elastic layer R having a hardness lower than the surface hardness of the transfer film on the outer surface of the metal core B. Has been.
Specifically, the elastic layer R is formed of a heat-resistant elastic body such as silicone rubber having a thickness of 2 to 3 mm and a hardness of 10 ° to 30 ° (JIS-A).

The control unit C of the image transfer apparatus 30 is connected to a drive control unit D1 as a drive source, a heating control unit D2 as a heating member, a drive control unit D3 as a pressure adjusting mechanism Pr, and other control elements (not shown).
The drive control unit D1 of the drive source controls the drive and drive speed of the preheat roller pair 31, 31, the heat roller pair 32, 32 and the cooling roller pair 33, 33 via the transfer motor M1.
The heating control unit D2 of the heating member controls energization to the heaters H1, H2, and H3 as heating bodies accommodated in the respective rollers based on the detection results of the temperature sensors provided to face the respective roller surfaces. I do.
The drive control unit D3 of the pressure adjustment mechanism Pr drives and controls the pressure adjustment mechanism Pr for adjusting the contact pressure of each roller pair via the cam motor M2.

The pre-heat roller pair 31, 31, the heat roller pair 32, 32 and the cooling roller pair 33, 33 are configured by a pair of upper and lower cylindrical rolls extending in the width direction (Y direction), and the pre-heat roller 31, the heat roller 32, In the cooling roller pair 33, heaters H1, H2, and H3 extending in the width direction (Y direction) are accommodated as heating elements, respectively.
In addition, temperature sensors SN1, SN2, and SN3 for detecting the surface temperature of each of the rollers 31, 32, and 33 are disposed in the preheat roller pair 31, 31, the heat roller pair 32, 32, and the cooling roller pair 33, 33. ing. A specific example of setting the surface temperature of each roller pair will be described later.

  The preheat roller pair 31, 31, the heat roller pair 32, 32 and the cooling roller pair 33, 33 are provided with a pressure adjusting mechanism Pr for adjusting the contact pressure of each roller pair. The contact pressure can be adjusted by adjusting. A specific example of the contact pressure of each roller pair will be described later.

  A discharge tray Tr as an example of a medium storage unit is supported downstream of the cooling roller pair 33 and 33 in the medium conveyance direction, and the medium that has passed through the cooling roller pair 33 and 33 on the most downstream side is discharged. Is done.

(2) Function of Image Transfer Device FIG. 4 is a cross-sectional view of a laminated body laminated by the image transfer device 30 according to the present embodiment, and FIG. 5 illustrates functions of a fixing unit and a cooling unit of the image transfer device 30. It is a cross-sectional schematic diagram for doing.
Hereinafter, the laminate function of the laminate in the image transfer apparatus 30 according to the present embodiment will be described with reference to the drawings.

(2.1) Laminate As shown in FIG. 4, the laminate includes a card substrate 1 and a transfer film 3 for the front surface and a transfer film 5 for the back surface as a transfer film on which the images 2 and 4 are formed. 4 are stacked and laminated so that the surface on which 4 is formed faces the card substrate 1.

An IC chip is built in the card substrate 1, and the IC chip is constituted by an IC tag capable of wireless communication. Therefore, information can be transmitted and received in a non-contact manner via the IC chip. In the IC chip of this embodiment, information on the medium such as the type of constituent material of the card base 1 and the size of the card base 1 is stored in advance.

The card substrate 1 is preferably opaque so that an image formed on the transfer film when it is formed into a laminate is easily visible, and more preferably white.
Therefore, examples of the material include acetate film, cellulose triacetate film, nylon film, polyester film, polycarbonate film, polystyrene film, polyphenylene sulfide film, polypropylene film, polyimide film, and cellophane. Among them, a polyester film is preferable, and a biaxially stretched polyethylene terephthalate (PET) film is particularly preferably used.

  Further, the card base 1 has a shape having a thickness sufficient to satisfy the requirements as the card base 1 and has a thickness in the range of 50 to 5000 μm, more preferably in the range of 100 to 1000 μm. A PET film is used.

The transfer films 3 and 4 have film-like base material layers 3a and 5a. Image receiving layers 3b and 5b are supported on the surfaces of the base material layers 3a and 5a. In addition, the base material layers 3a and 5a can be constituted by, for example, a PET film having a thickness in the range of 50 to 500 μm, more preferably in the range of 75 to 150 μm.
The base material layers 3a and 5a are required to have transparency, and at least the formed images 2 and 4 pass through the base material layers 3a and 5a from the surface opposite to the surface on which the images 2 and 4 are formed. It should just be transparent so that it can be visually observed.

(2.2) Lamination of image transfer device The transfer film 3 for the surface on which the image 2 on the first surface of the card substrate 1 is printed is conveyed to the reversing path 16, and then the conveying direction is reversed in the front-rear direction. 3b is accommodated in the collating tray 25 with the top surface.
Next, the card substrate 1 is sent out from the card tray 22, and the card substrate 1 is stacked on top of the front transfer film 3.
Next, the back transfer film 5 on which the image 4 on the second side is printed is conveyed to the collating tray 25 without passing through the reverse path 16. Therefore, the back transfer film 5 on which the second image 4 is printed is stacked on the collating tray 25 with the image receiving layer 5b facing downward and the image receiving layer 5b facing the upper surface of the card substrate 1. The

  When the card substrate 1 and the transfer films 3 and 5 are stacked, the temporary fixing device 26 is operated, and the card substrate 1 and the transfer films 3 and 5 are heat-sealed at two locations, and the card substrate 1 and the transfer are transferred. It becomes an integral laminated body in which the films 3 and 5 are temporarily fixed.

Then, the laminate is conveyed to the fixing unit of the image transfer device 30 on the downstream side, and is temporarily laminated by the preheat roller pairs 31 and 31 at a lower temperature than the heat roller pairs 32 and 32. Specifically, the surface temperature of the pair of preheat rollers 31, 31 is set to 90 ° C to 110 ° C, and the load is set to 100N to 200N.
By passing through such a temporary laminating step, even if there is a difference in thermal expansion coefficient between the card substrate 1 and the transfer films 3 and 5, the difference in elongation between the two due to heat is alleviated, and the positional deviation is reduced. You can get no plastic sheet.

  The laminated body that has passed through the pre-heat roller pair 31, 31 is conveyed to the nip portion of the heat roller pair 32, 32, and is heated and pressurized. The heat roller pairs 32 and 32 heat and pressurize the laminated body at a temperature and pressure at which the image receiving layers 3b and 5b of the transfer films 3 and 5 are transferred from the base material layers 3a and 5a to the surface of the card base material 1. Specifically, the surface temperature of the heat roller pairs 32 and 32 is set to 120 ° C. to 130 ° C., and the load is set to 1000 N to 2000 N.

  The laminated body heated and pressurized by the heat roller pairs 32 and 32 is cooled by the cooling unit. When a cooling part is not provided, there exists a possibility that curvature may generate | occur | produce in a laminated body with the difference in the thermal expansion coefficient of the transfer films 3 and 5 and the card | curd base material 1. FIG. Therefore, in the cooling unit, the temperature of the laminated body is cooled from the glass transition temperature (Tg) or higher to Tg or lower after passing through the heat roller pairs 32 and 32.

In the present embodiment, the cooling unit is configured by four pairs of cooling rollers 33 and 33 arranged in series along the transport direction of the laminated body. The four pairs of cooling rollers 33 and 33 are set to have lower surface temperatures and lower loads than the heat roller pairs 32 and 32, respectively.
As an example, the respective surface temperatures are 70 to 80 ° C. for the first cooling roller pair 33a and 33a and the second cooling roller pair 33b in order from the upstream cooling roller pair 33 and 33 along the conveying direction of the laminate. 33b is set to a range of 65 to 75 ° C, the third cooling roller pair 33c and 33c are set to a range of 65 to 70 ° C, and the fourth cooling roller pair 33d and 33d are set to a range of 50 to 60 ° C.
The loads of the respective cooling roller pairs 33 and 33 are set to 100N to 200N.

The laminated body cooled by the cooling roller pairs 33 and 33 is discharged to the discharge tray Tr, and a laminated body is obtained. Here, when a plurality of individual images are formed on the laminated body, the image is cut for each image to obtain a laminated body having a predetermined size.
For example, in the case of a pattern of several cards, the card is cut one by one and laminated on the front and back with a transfer film.

(3) Actions and effects of image transfer device (3.1) Pressure contact action In the laminating process of the laminated body described above, the surface of the laminated body is used to pressurize and heat the laminated body at a temperature of Tg or higher at the fixing portion. If the foreign matter adheres, the shape of the foreign matter may be transferred to the card base 1 to cause a dent.
FIG. 9 shows a belt nip-type image transfer apparatus 200 in which a pair of stainless steel belts are stretched around a metal roller as a comparative example.

"Comparative example"
In the image transfer apparatus 200 of the comparative example, a pair of belts 210 and 210 are stretched by a pair of tension rollers 220 and 220 and a pair of inlet rollers 230 and 230, respectively. 210 is configured not to cause distortion.
Inside the pair of belts 210 and 210, a pair of heating and pressure rollers 250 and 250 and a cooling roller 260 and 260 are interposed between the tension rollers 220 and 220 and the inlet rollers 230 and 230 via the belts 210 and 210, respectively. Are placed in pressure contact.

The laminated body is heated and pressed by heat and pressure rollers 250 and 250 disposed behind the pair of inlet rollers 230 and 230 and heat-sealed.
On the other hand, since the pair of tension rollers 220 and 220, which are metal rollers, and the pair of belts 210 and 210 spanned between the pair of inlet rollers 230 and 230 are stainless steel belts, their surfaces are hard and adhere to the belt surface. There is a possibility that the foreign matter is pressed and the shape of the foreign matter is transferred to the card substrate 1 to cause a dent.

"This embodiment"
In the image transfer apparatus 30 according to the present embodiment, each of the preheat roller pairs 31 and 31, the heat roller pairs 32 and 32, and the cooling roller pairs 33 and 33 has elasticity that is lower than the surface hardness of the transfer film. A layer is formed.
That is, silicone having a thickness of 2 to 3 mm and a hardness of 10 ° to 30 ° (JIS-A) is provided so that the surface of each roller can be deformed following the irregularities of the foreign matter even if foreign matter is present in the nip portion. An elastic layer made of rubber is formed (see FIG. 2B).
Therefore, in the laminating process, even if the laminate is pressed and heated at a temperature of Tg or higher with foreign matter adhering to the surface, the shape of the foreign matter is transferred to the card substrate 1 to suppress dents generated. be able to.

(3.2) Cooling control When the laminated body heated and pressurized by the heat roller pairs 32 and 32 passes through the four cooling roller pairs 33 and 33 arranged in series along the conveying direction of the laminated body. The glass is cooled from the glass transition temperature (Tg) to Tg or less.
FIG. 6 shows an example of temperature control of the cooling roller pairs 33 and 33 in the image transfer apparatus 30 according to the present embodiment.

As shown in FIG. 6, the heating control unit D <b> 2 controls the temperature of the cooling roller pair 33 and 33. The heating control unit D2 is cooled with a cooling profile that can maintain planarity when the laminate is cooled from Tg to Tg based on the detection results of the temperature sensors SN3a, SN3b, SN3c, and SN3d. Further, on / off of each heater H3 provided in each cooling roller 33 is controlled so that each cooling roller has preset temperatures T1, T2, T3, T4.
As a result, the laminated body heated and pressed by the heat roller pairs 32 and 32 is sequentially cooled to Tg or less while passing through each pair of cooling rollers 33 while maintaining flatness, and is discharged to the discharge tray Tr. The Rukoto.
The optimum set temperature of each cooling roller pair 33, 33 for each type of card substrate 1 is determined in advance through experiments or the like, and the ROM of the control unit C of the image transfer device 30 is stored in the ROM of the card substrate 1. It is stored as a table value associated with each type.

(3.3) Pressure Control The drive control unit D3 of the pressure adjustment mechanism adjusts the contact pressure of the cooling roller pairs 33 and 33 via the pressure adjustment mechanism Pr.
FIG. 7A schematically shows the posture of the laminated body when the laminated body heated and pressed by the heat roller pairs 32 and 32 enters the nip portion of the first cooling roller pair 33a and 33a. FIG. 7B schematically shows the posture of the laminate when the rear end of the laminate heated and pressed by the heat roller pairs 32 and 32 passes through the nip portion of the heat roller pairs 32 and 32.

When the laminated body heated and pressed by the heat roller pairs 32 and 32 enters the nip portion of the first cooling roller pair 33a and 33a, the laminated body has a temperature equal to or higher than Tg. As a result, in the softened laminate, a loop is formed between the heat roller pair 32, 32 and the first cooling roller pair 33, 33, and the transfer film comes into contact with the surface of the first cooling roller pair 33a, 33a. There is a risk of damage occurring on the surface (see FIG. 7A).
In addition, the laminate is released from the rolled state at the moment when the rear end of the laminate heated and pressurized by the heat roller pair 32 and 32 passes through the nip portion of the heat roller pair 32 and 32, and the conveyance speed temporarily increases. To do. The preceding laminated body is conveyed in a state of being nipped between the first cooling roller pair 33a, 33a and the cooling roller pair on the downstream side thereof. As a result, in the softened laminate, a loop is formed between the heat roller pair 32, 32 and the first cooling roller pair 33a, 33a, and the transfer film comes into contact with the surface of the first cooling roller pair 33a, 33a. There is a risk of damage occurring on the surface (see FIG. 7B).

FIG. 8 is a diagram for explaining an example of pressure control of the cooling roller pair in the cooling unit of the image transfer apparatus 30.
The drive control unit D3 of the pressure adjusting mechanism Pr drives and controls the pressure adjusting mechanism Pr for adjusting the contact pressure of each cooling roller pair 33, 33 via the cam motor M2. Specifically, the contact pressure of the first cooling roller pair 33a, 33a is lowered at the timing when the leading end of the laminated body enters the nip portion of the first cooling roller pair 33a, 33a. The contact pressure between the second cooling roller pair 33b and 33b and the cooling roller pair downstream thereof is set higher than that of the first cooling roller pair 33a and 33a (FIG. 8A).
Thereafter, after the elapse of a predetermined time, the contact pressure of the first cooling roller pair 33a, 33a increases so as to be the same as the contact pressure of the second cooling roller pair 33b, 33b and the cooling roller pair downstream thereof. (FIG. 8B).

As an example, the contact pressure of the first cooling roller pair 33a, 33a is set to 3N to 5N, the contact pressure of the second cooling roller pair 33b, 33b and the cooling roller pair downstream thereof is set to 10N to 20N. It is possible to reduce the amount of loop that is likely to be formed in the laminate between the roller pair 32, 32 and the first cooling roller pair 33a, 33a, thereby suppressing damage to the transfer film surface.
Then, the contact pressure of the first cooling roller pair 33a, 33a is lowered again at the timing when the rear end of the laminated body passes through the nip portion of the heat roller pair 32, 32 (FIG. 8C).
Thereafter, after the rear end of the laminated body passes through the nip portion of the heat roller pair 32, 32, the contact pressure of the first cooling roller pair 33a, 33a is changed to the same contact pressure as that of the second cooling roller pair 33b, 33b. Then, the laminated body passes through each cooling roller while maintaining the flatness (FIG. 8D).
Note that the optimum contact pressure of each cooling roller pair 33 and 33 for each type of the card base 1 is measured in advance by experiments or the like, and the ROM of the control unit C of the image transfer apparatus 30 stores the card base 1 It is stored as a table value associated with each type.
Further, the front end and the rear end of the laminated body are detected by the sheet sensors S1 to S5 and taken into the drive control unit D3 of the pressure adjusting mechanism Pr.

(3.4) Speed Control The drive control unit D1 of the drive source controls the drive speeds of the heat roller pairs 32 and 32 and the cooling roller pairs 33 and 33 via the transfer motor M1. Specifically, the conveyance speed of the first cooling roller pair 33a, 33a is increased as compared with the heat roller pair 32, 32 at the timing when the stacked body enters the nip portion of the first cooling roller pair 33a, 33a. As a result, when the laminate enters the nip portion of the first cooling roller pair 33a, 33a, the loop formed between the heat roller pair 32, 32 and the first cooling roller pair 33, 33 is reduced and transferred. Damage to the film surface can be suppressed.

DESCRIPTION OF SYMBOLS 1 ... Card base material 2, 4 ... Image 3, 5 ... Transfer film 3a, 5a ... Base material layer 3b, 5b ... Image receiving layer 10 ... Image forming apparatus 11 ... Film tray 12... Image forming section 13, 15... Transport path 14... Ejection port 16 .. Reversing path 17. ... Card tray 23 ... Guide member 25 ... Collecting tray 26 ... Temporary fixing device 30, 200 ... Image transfer device 31 ... Preheat roller 32 ... Heat roller 33 ... Cooling rollers H1, H2, H3... Heaters S1, S2, S3, S4, S5... Sheet sensors SN1, SN2, SN3.

Claims (4)

A first roller pair that heats and pressurizes a substrate and a laminate in which a film having an image recorded on the surface is laminated;
A plurality of heated and pressurized second roller pairs that cool while transporting the stacked body are arranged on the downstream side in the transport direction of the stacked body of the first roller pair ,
The leading end of the laminated body is first on the downstream side in the conveying direction of the laminated body of the first roller pair.
At the timing of entering the contact portion of the second roller pair disposed at the first position.
The contact pressure of the second roller pair is lower than the contact pressure of the first roller pair,
An image transfer apparatus. The leading end of the laminated body is first on the downstream side in the conveying direction of the laminated body of the first roller pair.
At the timing of entering the contact portion of the second roller pair disposed at the first position.
Further, the conveyance speed of the second roller pair is made higher than the conveyance speed of the first roller pair.
The image transfer apparatus according to claim 1. At the timing when the rear end of the laminate is discharged from the contact portion of the first roller pair, the product
The contact pressure of the second roller pair arranged first on the downstream side in the transport direction of the layer body is the first pressure.
Lower than the contact pressure of one roller pair,
The image transfer apparatus according to claim 1, wherein the image transfer apparatus is an image transfer apparatus. The surface of the first roller pair and the second roller pair is lower than the surface hardness of the film.
Composed of elastic body with high hardness,
The image transfer apparatus according to claim 1, wherein the image transfer apparatus is an image transfer apparatus.

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