JPH0299946A - Transfer roller for image transfer device - Google Patents

Abstract

PURPOSE:To prevent by means of a simple structure both picture sheet and picture receiving sheet from being damaged at the time of transfer and from being wound onto transfer rollers by coating the periphery of the transfer rollers with fluororesin. CONSTITUTION:The picture sheet 26 and the picture receiving sheet 28 are inserted among the transfer rollers 136, 138, and 140, at the state overlapped with each other; they are carried while they are pressed and pinched, so that a picture recorded on the picture sheet 26 is transferred onto the picture receiving sheet 28. The surfaces of the transfer rollers 136, 138, and 140, made of silicone rubber or metal, are coated with fluororesin. This prevents the picture sheet 26 and the picture receiving sheet 28 from being damaged without the use of a cover sheet, and also from being wound.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is used in an image transfer device that transfers an image on an image sheet to an image receiving sheet in a state where the image sheet and the image receiving sheet are overlapped. The present invention relates to a transfer roller that transfers an image from an image sheet to an image-receiving sheet by heating the image sheet while pressing and nipping the sheet.

[Prior Art] Before printing a large number of sheets by creating a printing plate using a plate-making material such as a PS plate from a color original, a color proof is created and so-called color proofing work is performed. As photosensitive materials (image sheets) for creating color proofs, there are known photosensitive materials using silver halide photography, photosensitive materials using electrophotography, and photosensitive materials using photopolymers. A color proof can be obtained by exposing these photosensitive materials to print an image, developing the material, and then transferring the image to an image-receiving sheet.

In this case, four sheets of photosensitive material are used, each as a blank,
A multicolor image is created by creating image sheets on which cyan, magenta, and yellow color images are formed, and sequentially transferring these to an intervening image receiving sheet.

When transferring four image sheets to an image-receiving sheet in sequence, first place the image-receiving sheet on a support such as an aluminum plate, then place the image sheets on top of it and insert it between a pair of transfer rollers. The image is transferred by being heated and transferred while being pressed and clamped.

However, since the image receiving sheet and the image sheet are thin, if they are inserted between the pair of transfer rollers as they are, they may wind around the transfer roller. There is also a risk that the image sheet or image receiving sheet may be damaged by the surface of the transfer roller.

For this reason, the surfaces of the image sheet and image-receiving sheet that have been superimposed are covered with a cover sheet, and in this state, they are inserted between the pair of transfer rollers.

[Problems to be Solved by the Invention] However, with this cover sheet, the image sheet and the image-receiving sheet must be aligned and overlapped, and then further overlapped on top of the image sheet and the image-receiving sheet, which is a complicated operation.

Furthermore, air trapped between the cover sheet and the image sheet must be removed, which is a complicated process.

Furthermore, when trying to automatically convey and insert an image sheet and an image receiving sheet superimposed on a support between a pair of transfer rollers, there is a need to cover the image sheet and the image receiving sheet automatically. There is a problem in that the device for conveying and inserting it between the pair of transfer rollers becomes complicated.

The present invention takes the above facts into consideration, and provides a transfer roller for an image transfer device that has a simple structure, does not damage an image sheet and an image-receiving sheet during transfer, and can prevent them from being wrapped around the transfer roller. is the purpose.

[Means for Solving the Problems] The present invention is used in an image transfer device that transfers an image on an image sheet to an image receiving sheet in a state where the image sheet and the image receiving sheet are overlapped, and the image sheet and the image receiving sheet are pressed. It is a silicone rubber roller or a metal roller that transfers an image from an image sheet to an image receiving sheet while nipping the image, and has a structure characterized in that the outer peripheral surface of the transfer surface is coated with a fluororesin.

[Operation] In the present invention having the above configuration, the image sheet and the image receiving sheet are inserted between the transfer rollers in a superimposed state, and are conveyed while being pressed and nipped. As a result, the image recorded on the image sheet is transferred to the image receiving sheet.

The surface of this silicone rubber roller or metal transfer roller is coated with fluororesin, so that the image sheet and image receiving sheet will not be damaged even if a cover sheet is not used. Also, there is no need to wrap these two sheets together.

In this way, in the present invention, since the surface of the transfer roller is coated with fluororesin, the structure is simple, the surface of the image sheet is not damaged during transfer, and the image sheet is prevented from being wrapped around the transfer roller. I can do it.

[Effects of the Invention] As explained above, in the present invention, the outer peripheral surface of the transfer roller is coated with fluororesin, so the structure is simple and the image sheet is not damaged during transfer without using a cover sheet. It has the excellent effect of being able to prevent the transfer roller from being wrapped around the transfer roller.

Also, since the heat that was previously absorbed by the cover sheet is no longer present, the temperature of the upper heat roller can be lowered, reducing electricity consumption.

[Embodiment] FIG. 1 shows an embodiment of an image transfer device 10 according to the present invention, FIG. 1 is a left side view showing a schematic configuration of the image transfer device 10, and FIG. FIG. 2 is an exploded perspective view of the transfer device.

As shown in FIGS. 1 and 2, the image transfer device 10 includes a guide portion 18, a temporary fixing portion 20, a transfer portion 22, and a guide portion 18, a temporary fixing portion 20, a transfer portion 22, , cooling unit 24 are arranged in this order.

The image sheet 26 on which the image has been printed and the image-receiving sheet 28 are superimposed, and the guide section 18, temporary fixing section 20, transfer section 22,
The image sheet 26 is sent to a cooling section 24 and the image on the image sheet 26 is transferred to an image receiving sheet 28.

As shown in FIGS. 1 and 2, the guide portion 18 is connected to the side plate 14.
．． A workbench 29 is arranged between 16 and 16.

This workbench 29 is supported by side plates 14.16 on both sides, and a guide plate 30 is placed on the top surface. The image receiving sheet 28 and the image sheet 26 are superimposed on this guide plate 30. This guide plate 30 is connected at both sides to a chain belt to be described later, and thereby the image transfer device 10
It is designed to be conveyed in the longitudinal direction (in the six directions of arrows). As a result, a conveyed sheet body (hereinafter simply referred to as "transported sheet") 34, which is formed by overlapping the image sheet 26 and the image receiving sheet 28 on the guide plate 30, is guided to the temporary fixing section 20.

A rectangular opening 36 is provided in the workbench 29 on the front side in the conveyance direction along the width direction (direction of arrow B) of the image transfer device 10 . A flat bar 42 that is moved up and down by a positioning mechanism 38 is inserted into this opening 36 .

As shown in FIGS. 1 and 2, the positioning mechanism 38 is disposed below the workbench 29. A plurality of positioning pins 40 are erected on the upper surface of the flat plate bar 42. The intervals between these positioning pins 40 are arranged to correspond to the through holes 30A provided in the guide plate 30, and the distances between the positioning pins 40 correspond to the through holes 30A provided in the guide plate 30.
4 is positioned on the workbench 29.

These positioning pins 40 correspond to the positioning holes 26A128Δ provided in the image receiving sheet 26 and the image sheet 28, and are used for positioning (registering) the image receiving sheet 26 and the image sheet 28.

The flat plate bar 42 has one end of a shaft 44 fixed to the lower portion of both ends in the longitudinal direction. The other end of the shaft 44 is inserted into a slide bearing 48.

The slide bearing 48 is attached to a base 46 attached to the side plate 16.
It is fixed on the top and supports the shaft 44 so as to be movable in the axial direction.

Further, a bracket 50 is attached to the lower part of the longitudinally intermediate portion of the flat plate bar 42, and one end of the connecting bar 52 is connected via the bracket 50.

The other end of the connecting bar 52 is eccentrically connected to a rotary plate 58 fixed to the drive shaft of a motor 54. The motor 54 is fixed to the base 46 via a mounting bracket 56. Thereby, the connecting bar 52 is moved in the vertical direction by the drive of the motor 54, and the flat bar 42 is moved in the vertical direction.

Further, above the guide part 18, there is a workbench 290 in the width direction (arrow B).
A brush 60 is disposed along the direction. This brush 60 is moved by a brush drive mechanism 62 to the conveyed sheet 30.
It is designed to be moved along the conveyance direction (direction of arrow A).

The brush drive mechanism 62 has a pair of guide rails 64 mounted to the side plates 14.16 and located outwardly between the side plates 14.16. Two sets of guide rollers 66 and 68 are arranged on these guide rails 64, sandwiching the guide rails 64 therebetween. Each pair of guide rollers 66, 68 is fixed to the moving plate 70, thereby guiding the moving plate 70 along the longitudinal direction of the guide rail 64 (direction of arrow A).

An intermediate portion of a thrust shaft 72 arranged along the vertical direction is connected to the moving plate 70 via a slide bearing 74 . Therefore, the thrust shaft 72 is movable along the conveyance direction of the conveyed sheet 34 and also movable along the vertical direction.

The thrust shaft 72 is connected to a chain belt 76 disposed along the conveyance direction of the conveyed sheet 34 and a connecting bracket 7.
They are connected via 8. In this connection, the thrust shaft 72 is connected to the connection bracket 78 so as to be movable in the vertical direction.

The chain belt 76 is stretched between the side plates 14 and 16, and between a pair of sprockets 84 and a pair of sprockets 86 fixed to both ends of a pair of shafts 80 and 82. These sprockets 84, 86 are attached to the side plate 14.
It is located outside between 16 and 16.

A sprocket 88 is installed between the side plates 14 and 16 of the shaft 80.
is installed. A chain belt 91 is wound around this sprocket 88 and a sprocket 94 fixed to a drive shaft of a motor 92. The motor 92 is fixed to the side plate 14 via a mounting bracket. This increases the driving force of the motor 92 (94.8)
8 to the shaft 80 and the sprocket 84
The energy is transmitted to the chain belt 76 via the endless chain belt 76, so that the endless chain belt 76 rotates.

A pair of guide rollers 96 are attached to the lower end portions of each of the pair of thrust shafts 72, and are placed on the upper surfaces of a pair of guide plates 98. Guide plate 9
8 is arranged along the longitudinal direction of the side plate 14.16 and is fixed to the outside of the side plate 14.16. Guide plate 9
8 is bent on the insertion side of the conveyed sheet 34 to form a step, and the tip portion is located below the intermediate portion of the guide plate 98 .

Further, the rear end portion, that is, the temporary fixing portion 20 side is also bent to form a step, and the rear end portion is located above the intermediate portion of the guide plate 98. For this reason, the brush 60 is located below the middle part of the insertion part to make it easier for the operator to work.
On the side of the temporary fixing part 20, the tip of the brush 60 touches the conveyed sheet 34.
It is located above the middle part so as to be away from the middle part.

This cover sheet 100 covers the image sheet and image receiving sheet superimposed on the guide plate 30.

As shown in FIGS. 1, 2, and 3, the temporary fixing portion 20 has a temporary fixing roller 102 stretched between the side plates 14 and 16. This temporary fixing roller 102 is a skewer-shaped roller in which a plurality of rings are inserted into the roller at equal intervals and fixed with screws, and both ends of its rotating shaft are attached to the side plates 14.
16 and is supported by a bearing 106.

The bearing 106 is fixed to the tip of the drive shaft of the air cylinder 104. Air cylinder 104 has side plate 14.16
It is fixed to via a mounting bracket 108. This temporary fixing roller 102 is configured to move up and down by the operation of an air cylinder 104.

A heat roller 110 is suspended between the side plates 14.16 above the temporary fixing roller 102, and a bearing 112 is attached to the side plate 14.16.
Supported through. When the temporary fixing roller 102 rises, it comes into pressure contact with the heat roller 110. This heat roller 110 has a thin pressure-resistant and heat-resistant rubber 11OC on the entire outer circumference of a hollow roller body 110A.
is pasted. A rod heater 111 is inserted into the hollow interior of the heat roller 110 . This rod heater 11
1 is a sheathed heater, and a heating element 111A is sealed inside. This heating element 111A is the heat roller 1
The portions corresponding to both ends in the axial direction where a large amount of heat is released in No. 10 are wound tightly so that the amount of heat generated per unit length is increased, and the intermediate portion in the axial direction is wound loosely. In this way, the rod heater 111A uniformly heats the heat roller 110.

Both ends of the rod heater 111 protrude from both ends of the heat roller 110 and are supported by the support plate 109. The support plate 109 is attached to the side plate 1 by the stay 113.
Fixed to 4.16.

One end of the rod heater 111 is connected to one end of a lead wire 111B that is tangential to a power source (not shown). As a result, the rod heater is energized and heated.

The heat roller 11 is inserted between the side plate 14 and the support plate 1090.
A gear 114 is attached to the outer tip of the side plate 14 of 0. This gear 114 meshes with a gear 118 attached to the drive shaft of a motor 116. motor 116
is a mounting plate fixed to the side plate 14 with a stay 120) 1
It is fixed to 22. Therefore, the heat roller 110 is rotationally driven by the drive of the motor 116.

The transfer section 22 has a side plate 1 as shown in FIGS. 2 and 4.
A pair of frames 124, 126 are attached to each of the frames 124, 126. A pair of rectangular openings 128 and 130 are sequentially provided in each of the frames 124 and 126 along the conveyance direction of the conveyed sheet 34.

A heated transfer roller 136 is located between the frames 124 and 126.
138, 140, and 142 are laid out over each other.

Heated transfer rollers 136, 138 are attached to frames 124, 12
The heated transfer roller 136 is placed above the opening 128, and the heated transfer roller 138 is placed below the opening 128. The conveyed sheet 34 is inserted between the heated transfer rollers 13G and 138.

Frame 124.12 of heated transfer roller 136.138
Since the support structure for the heated transfer roller 136 is the same, the support structure for the heated transfer roller 136 will be explained.

Both ends of the rotating shaft of the heated transfer roller 136 are supported by a pair of support blocks 144 via bearings 146. Air cylinder 148 supported by the upper white wall of opening 128
The rod and the support block 144 are connected. Further, grooves 144A are provided on both sides of the support block 144, and a convex portion 128A provided on the opposite wall of the opening 128 is inserted into the groove 144Δ. Therefore, the support block 144 is guided by the convex portion 128A, and is movable in the vertical direction by driving the air cylinder 148.

Heated transfer roller 136 supported on support block 144
is hollow as shown in Figures 4, 5, and 6,
A bar heater 132 is inserted inside it. The image leading end of the rod heater 132 protrudes outward from the heating transfer roller 136 and is supported by a support plate 150 located outwardly between the frames 124 and 126.

The support plate 150 is supported by the support block 144 via a pair of stays 152. Support plate 150
A sprocket 154 is attached to the shaft portion of one end of the heated transfer roller 136 between the support block 144 and the support block 144 via a way clutch 143 .

Further, a heated transfer roller 138 disposed below the heated transfer roller 136 is also supported in the same manner as the heated transfer roller 136. The support block 144 is connected to a rod of an air cylinder 156 supported on the downward wall of the opening 128 provided in the frame 124, and is movable in the vertical direction like the heated transfer roller 136.

Further, between the support plate 150 and the support block 144, a sprocket 154A is attached to the shaft portion of one end of the heated transfer roller 138 via a one-way clutch 143Δ.

Therefore, when the air cylinders 148, 156 are activated, the heating transfer rollers 136, 138 move in the direction in which they come into contact with each other to press, nip, and heat the conveyed sheet 34.

A heater 135 is disposed within the heated transfer rollers 136 and 138, and is configured to heat the conveyed sheet 34. The explanation will be given by taking the heated transfer roller 136 among the heated transfer rollers 136 and 138 as an example.

The heating transfer roller 136 has an aluminum sleeve 270 inserted into a roller body 136A made of a hollow pipe. Both ends of the roller main body 136A have a reduced diameter, and are inserted into a bearing 146 and pivotally supported.

A thin pressure-resistant and heat-resistant rubber (
For example, 136C (silicone rubber, etc.) is pasted over the entire circumference. Furthermore, a Teflon coating 272 is formed on the outer periphery of this pressure-resistant and heat-resistant rubber 136C. This Teflon coating 272 comes into contact with the conveyed sheet 34 and prevents it from being scratched.

Heater 135 is located within sleeve 270. This heater 135 is a sheathed heater, and a heating element 135A is sealed inside. The heating element 135A is tightly wound at the portions corresponding to both axial ends of the heating transfer roller 136 where a large amount of heat is released, and loosely wound at the axially intermediate portion. For this reason, the amount of heat generated is greater at both ends in the axial direction, where a large amount of heat is released, than at the middle portion.

Similar to the heating transfer roller 136, the heating transfer roller 138 also has a heating element 135A disposed within its main body.

The frame 124.
The heated transfer roller 1 is inserted into the opening 130 provided in the
40 is arranged above, and a heated transfer roller 142 is arranged below.

The heated transfer roller 140 penetrates the support block 144 and protrudes outside the frame 124, and sprockets 158 and 160 are attached at the tip of the shaft portion between the support block 140 and the support plate 150 via a one-way clutch 145. ing.

A Cheno belt 166 is wound around the sprocket 158 and a sprocket 164 fixed to the drive shaft of the motor 162. The motor 162 is fixed to the side plate 14 via a bracket 168. Therefore motor 16
The rotational driving force of 2 is transmitted to the sprocket 158 by the Cheno belt 166, so that the heated transfer roller 140 is rotated.

Furthermore, a Cheno belt 170 is wound between the sprocket 160 and the sprocket 154 on the side of the heated transfer roller 136, and the rotational driving force of the motor 162 is transmitted to the heated transfer roller 140 via the sprocket 158 to the heated transfer roller 136. It is meant to be transmitted.

Further, similarly to the heat transfer roller 140, the heat transfer roller 142 disposed below the heat transfer roller 140 is connected to a sprocket between the support block 144 and the support plate 1500 via a one-way clutch 145A at the tip of the shaft of the heat transfer roller 142. 174.176 are installed. A Cheno belt 182 is wound around the sprocket 174 and a sprocket 180 fixed to the drive shaft of the motor 178, which is disposed below the motor 162. The motor 178 is fixed to the side plate 14 via a bracket 184. Therefore, the rotational driving force of the motor 178 is transmitted to the heated transfer roller 142 by the Cheno belt 182, and the heated transfer roller 142 is rotated.

Also, between sprockets 176 and 154 is Cheno belt 1.
88 is wound around, so that the rotational driving force transmitted to the heated transfer roller 142 is transmitted to the heated transfer roller 138.

In this case, the outer diameter of the heated transfer roller 142 is set to be equal to or larger than the outer diameter of the heated transfer roller 138, and when the heated transfer rollers 142 and 138 are rotated by the driving force of the motor 178, the outer diameter of the heated transfer roller 142 is The speed is the same or greater than the peripheral speed of the heated transfer roller 138.

Further, the outer peripheral speed of the heated transfer rollers 136 and 140 located above the conveyance path of the conveyed sheet 34 is set to be equal to or slower than the outer peripheral speed of the heated transfer roller 138 located below the conveyance path by the motor 162 or its drive transmission. Speed is set.

For this purpose, the heated transfer roller 136.138.140.14
The conveyed sheet 34 conveyed to
．． Between 142 and 142, it is conveyed in a horizontal state with no slack or in a slightly tensioned state. However, when this tensile force is strong, the one-way clutches 143, 143A and 145 act to transfer the rotational force of the heated transfer roller 142 to the conveyed sheet 3.
Direct heating transfer roller 136.138.140 via 4
The heated transfer roller 136.138.1
40 is 1, and its outer peripheral speed is the same as that of the heated transfer roller 142. Therefore, since the conveyed sheets 34 are conveyed at the same speed, no misalignment occurs between the image receiving sheet and the image sheet.

Further, as shown in FIG. 1, auxiliary heaters 190 and 192 are arranged between the side plates 14 and 16 on the upstream side of the heated transfer rollers 136 and 138 in the direction of conveyance of the conveyed sheet 34. The auxiliary heaters 190 and 192 are the heating transfer roller 13.
6.138 is covered with a cover 194 which is partially opened to heat the heated transfer rollers 136.138.

A cover (not shown) is attached to each of the heated transfer rollers 136, 138, 140, 142 via a bracket (not shown) to the frame 124.1'26, and a cover (not shown) is attached to each of the heated transfer rollers 136, 138, 140, 142 via a bracket (not shown) to cover them all. A cover 196 is attached to the cover 196 to shield it from the outside. This allows the heated transfer roller 136.138.140
．． 142 heat is not released to the outside.

A pedestal 198 is suspended between the side plates 14 and 16 of the cooling section 24. The conveyed sheet 34 sent out from the transfer section 22 is taken out onto this pedestal 198.

A fan 200 is arranged above this pedestal 198. As a result, the conveyed sheet 34 taken out onto the pedestal 198 is cooled.

Next, FIG. 2 and FIG. This will be explained using figures.

As shown in FIG.
Shafts 204 and 206 are stretched between the cooling unit 8 and the cooling unit 24 and supported via bearings 208. shaft 204,
Each shaft 206 has a pair of sprockets) 210
, 212 are fixed. Also sprocket 210.
212 are located inside the side plates 14.16, respectively. A die belt 214 is wound between the sprockets 210, 212 near the side plate 14 and the sprockets 210, 212 near the side plate 16. This chain belt 2
14 and both sides of the guide plate 30 are connected via brackets. As a result, the board 30 is moved from the guide section 18 to the temporary fixing section 20 and the transfer section 2 by the chain belt 214.
2 and is conveyed to the cooling section 24.

A portion of the chain belt 214 is connected to the heated transfer roller 136.1.
38 and 140.142, and the other part of the chain belt 214 is guided by the side plate 14.1.
The conveyance path is bent while being guided by the idle sprocket 216 supported by the idler sprocket 216 supported by the idler sprocket 216 .

A transmission sprocket 218 is fixed to an intermediate portion of the shaft 204. This transmission sprocket 218 has a shaft 222 which is fixed to the machine base 12 and is connected to a shaft 222 through a bearing 220.
A chain belt 226 is wound around the idle sprocket 224 supported by the chain belt 226.

Further, an idle sprocket 228 is fixed to the shaft 222. A chain belt 232 is wound around the idle sprocket 228 and a sprocket 230. The sprocket 230 is disposed in the center of the machine base 12 and is attached to a drive shaft 236 supported by bearings 234 at both ends. A clutch 238 is disposed between sprocket 230 and drive shaft 236.

Similarly to the sprocket 230, a sprocket 242 is attached to the drive shaft 236 via a clutch 240. One end of the drive shaft 236 is connected to the bearing 2
34, and a sprocket 244 is fixed to the tip. The sprocket 244 is connected to the motor 246
A chain belt 250 is wound around a sprocket 248 fixed to a drive shaft 246A. motor 2
46 is fixed to the machine base 12. This allows motor 2
46 is adapted to be transmitted to the drive shaft 236 via the sprockets 248, 244.

In this case, the clutches 238, 240 transmit or interrupt rotational driving force to the sprockets 230, 242.

On the other hand, a one-way clutch 2 is located in the middle of the shaft 206.
A sprocket 254 is connected via 52. A chain belt 260 is wound around the sprocket 254 and a sprocket 258 fixed to the shaft 256. The shaft 256 is connected to the machine base 1 via a bearing 262.
2 is supported.

Further, a sprocket 264 is fixed to the shaft 256, and a chain belt 264 is connected between the sprocket 242 and the sprocket 264.
6 is wrapped around it. This allows the drive shaft 236
The rotational driving force of the motor 246 is transmitted to the shaft 256 via the sprockets 242 and 264.

The image transfer device 10 is also provided with a control section 189 that controls the operation of the image transfer device 10.

The connection between this control section 189 and each component will be explained using the block diagram shown in FIG. 8. The control unit 189 is RA
It consists of MI 91 ROMI 93, CPU 195, and human output port 197, which are connected to data bus 1.
99 are connected to each other.

As shown in FIG. 8, a start switch 2 for starting the image transfer device 10 is provided on the input side of the input/output capo [97].
01 is connected. Also, on the output side there is a motor 54.9
2.246 are connected to the air cylinder 104 and the air cylinder 148 via a solenoid valve 187.

Next, the operation of this embodiment will be explained according to the flowchart shown in FIG.

When the image transfer device 10 is powered on by the start switch, initialization of the image transfer device 10 is executed in step 300. As a result of this execution, the conveyed sheet 34 moves to the normal position of the guide section 18, and the positioning pin 40 also moves to the lower position. The brush 60 is located on the insertion side of the conveyed sheet 34.

The temporary fixing roller 102 is moved upward by the air cylinder 104 and is brought into pressure contact with the heat roller 110.

The heated transfer rollers 136 and 138 are each connected to an air cylinder 1.
48 and 156, and the heated transfer rollers 140 and 142 are also moved away from each other by air cylinders 148 and 156, respectively. In other words, the conveyance path for the conveyed sheet 34 is in an open state.

In this state, the motors 162, 178 are started, and the heated transfer rollers 136, 138, 140, 142 are rotated. Furthermore, since the motor 116 is also activated, the temporary fixing roller heat roller 110 and the temporary fixing roller 102 also begin to rotate.

Further, the fan 200 starts operating and blows air into the cooling section 24.

Further, each heater has started heating the heat roller 110 and the heating transfer roller 136, 138, 140, and 142.

Heat roller 110 and heated transfer roller 136,138
．． 140 and 142 rise in temperature, and when the temperature is adjusted and transfer becomes possible, a start switch is turned on to raise the pin 40.

(Step 301) From this state, the motor 54 is operated in step 302, and the positioning pin 4 is operated together with the flat bar 42.
0 rises. As a result, the flat bar 42 is inserted into the opening 36 of the actuating table 29, and the positioning pin 40 penetrates into the opening 36 of the guide plate 30 and projects onto the guide plate 30. An image sheet 26 and an image receiving sheet 2 are placed on this guide plate 30.
8 are placed one on top of the other, and the positioning pins 40 are inserted and set into the positioning holes 28A1 and 26A. In this case, the image sheet 26 is
, the image receiving sheet 28 can be easily aligned.

After the conveyed sheet 34 is set on the workbench 29 in step 304, a start switch (not shown) is turned on by the operator in step 305.

In step 306, the motor 92 is activated, and the brush 60 starts moving toward the back from the side where the conveyed sheet 34 is inserted. As a result, air remaining between the image sheet 26 and the image receiving sheet 28 is removed.

When the brush 60 moves to the front of the temporary fixing part 20, step 3
At 08, the operation of the motor 92 is stopped and the movement of the brush 60 is stopped.

Next, in step 310, the motor 54 is activated and the positioning pin 40 is lowered. As a result, the positioning pin 40 is removed from the guide plate 30. At step 312 the motor 24
6 is operated, and the guide plate 30 moves on the workbench 29 toward the temporary fixing part 20.

When the guide plate 30 approaches the temporary fixing part, the sensor detects the guide plate 3.
0 is detected, and the air cylinder 104 is activated in step 314.
is activated, and the temporary fixing roller 102 is lowered. The conveyed sheet 34 is temporarily fixed from the leading end by the temporary fixing roller 102 . The temporary roller 102 is connected to the air cylinder 10
4, it is in contact with the heat roller 110 and is heated.

Further, since the temporary fixing roller 102 is formed as a skewer-shaped roller, a plurality of temporary fixing positions are provided along the conveying direction of the conveyed sheet 34. For this reason, the air between the temporary fixing positions tends to escape backward in the conveying direction, and is pushed out when being conveyed between the heated transfer rollers 136 and 138 in the next step 316, causing the image sheet and image receiving sheet to be separated during transfer. No air bubbles are generated between the two.

At step 316, air cylinders 148, 156 are actuated to lower heated transfer roller 136 and raise heated transfer roller 138. As a result, the conveyance path for the conveyed sheet 34 is closed. The conveyed sheet 34 is conveyed between the heated transfer roller 136 and the heated transfer roller 138.

During this conveyance, since a Teflon coating 272 is formed on the surfaces of the heating transfer rollers 13G and 138, the conveyed sheet 34 being nipped and conveyed will not be damaged. Further, since Teflon is non-adhesive, it does not adhere to the conveyed sheet 34, and the conveyed sheet 34 is not wound around the heated transfer rollers 136, 138.

Furthermore, in the past, since the conveyed sheet 34 was covered with a cover sheet to protect it, the heated transfer roller 136.
38 was set at 125°C, but in this example, this cover sheet was abolished, so in order to make the temperature between the cover sheet and the image sheet 80°C, the heated transfer roller was set to 125°C. It is possible to set the temperature to be lower than the conventional temperature (for example, around 100° C.). Thereby, the power consumption of the heater for heating the thermal transfer roller 136 can be reduced. Furthermore, in step 318, the downstream air cylinders 148 and 156 are operated to
40 and 142 move, and the conveyance path for the conveyed sheet 34 is closed. The conveyed sheet 34 sent out from the heating transfer rollers 136 and 138 is fed between the heating transfer rollers 140 and 142, and is pressed and nipped therebetween, and is heated and transferred. Since the Teflon film 272 is also formed on the heated transfer rollers 140 and 142, the heated transfer rollers 14
0 surface temperature can be lowered.

These heated transfer rollers 142 are the heated transfer rollers 138
The outer peripheral speed of the heated transfer roller 142 is equal to or faster than that of the heated transfer roller 136. Further, the outer peripheral speed of the heated transfer rollers 136 and 140 located above the conveyance path of the conveyed sheet 34 is set by the motor 162 or driven so that it is the same or slower than the outer peripheral speed of the heated transfer roller 142 located below the conveyance path. The transmission mechanism is set. Therefore, the conveyed sheet 34
is sandwiched between heated transfer rollers 136 and 138, and when it is sandwiched between heated transfer rollers 140 and 142, the conveyance sheet 34 is conveyed in a horizontal state without slack or in a slightly tensioned state. However, when this tensile force becomes strong, the driving force is no longer transmitted to the heating transfer rollers 136, 138 via the one-way clutch 143, and the driving force is no longer transmitted to the heating transfer rollers 136, 138 via the conveyed sheet 34.
．． 140 rotates at the same outer peripheral speed as the heated transfer roller 142, that is, in synchronization.

This prevents misalignment between the image sheet 26 and the image-receiving sheet 28.

After the conveyed sheet 34 passes through the temporary fixing section 20 in step 320, the temporary fixing roller 102 is raised.

Heated transfer roller 136.13 in steps 322.324
8 and the heated transfer rollers 140 and 142 move to open the conveyance path for the conveyed sheet 34.

In this case, the conveyed sheet 34 is transferred to the transfer section 2 by the motor 246.
2 and then transported by motors 162 and 178. That is, the speed of transport by motors 162 and 178 is set faster than the speed of transport by the driving force of motor 246, and the one-way clutch 2
54, and therefore, during thermal transfer, it is transported by motors 162, 178 that drive thermal transfer rollers 136, 138, 140, and 142.

At step 326, when the conveyed sheet 34 is sent out from the transfer section 22, the operation of the motor 246 is stopped, and the movement of the guide plate 30 is stopped. At this time, the conveyed sheet 34
is moved to the cooling section 24 , and the conveyed sheet 34 , which has been heated to a high temperature in the transfer section 22 , is cooled in the cooling section 24 .

At step 328, motor 92 is activated and brush 60 begins to move toward its original position.

At step 330, the motor 92 is driven in reverse to drive the brush 60.
moves toward the insertion side of the conveyed sheet 34.

Next, in step 332, the motor 246 is driven in reverse to move the guide plate 30 to the guide portion 18 at high speed. Guide section 1
The guide plate 30 that has been moved at high speed to the end of 8 is moved at low speed in step 334 and stopped in step 336.

This completes the transfer, and after the operator turns up the cover sheet 100 of the guide plate 30 and peels off the base layer of the image sheet 26 from the image-receiving sheet 28, the image-receiving sheet 28 is removed from the guide 30.

Next, in step 338, the operator determines whether to return to before step 300 or to end. New image receiving sheet 28
After the image sheet 26 is set, it is determined whether or not the start switch is turned on, and if it is not turned on, the above operation ends. If the start switch is turned on, the process returns to before step 300 and the following steps are executed.

In this embodiment, the brush 60 returns to its initial position while the conveyed sheet 34 is being cooled, but it may be returned at any time after the conveyed sheet 34 passes through the temporary fixing section.

Further, in this embodiment, an image-receiving sheet has been described, but paper may also be used.

Further, in this embodiment, a Teflon coating was formed on the surface of the silicone rubber roller, but a Teflon coating may be formed on the surface of the metal roller.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of an image transfer device to which the present invention is applied, FIG. 2 is an exploded perspective view of the image transfer device, and FIG. FIG. 4 is a perspective view showing the support structure of the heated transfer roller, FIG. 5 is a sectional view showing the heated transfer roller, FIG. 6 is a sectional view taken along the rV-rV line in FIG. 5, and FIG. FIG. 8 is a plan view showing a drive system for transporting and driving the guide plate, FIG. 8 is a control block diagram showing connections between the control section and other devices, and FIG. 9 is a flow chart showing the operation of the transfer device. DESCRIPTION OF SYMBOLS 10... Image transfer device, 22... Transfer part, 26... Image sheet, 28... Image receiving sheet, 30... Guide plate, 34... Conveyed sheet, 136... Heat transfer Roller, 138... Heat transfer roller, 140... Heat transfer roller, 142... Heat transfer roller, 272... Teflon coating.

Claims (3)

[Claims] (1) Used in an image transfer device that transfers the image on the image sheet to the image-receiving sheet in a state where the image sheet and the image-receiving sheet are overlapped, and the image on the image sheet is heated while pressing and sandwiching the image sheet and the image-receiving sheet. 1. A transfer roller for an image transfer device, the transfer roller for transferring an image onto an image receiving sheet, the outer peripheral surface of which is coated with a fluororesin. (2) The transfer roller has an outer cover made of silicone rubber,
2. The transfer roller for an image transfer device according to claim 1, wherein the outer peripheral surface of the transfer roller is coated with a fluororesin. (3) The transfer roller for an image transfer device according to claim (1), wherein the transfer roller made of metal has an outer peripheral surface thereof coated with a fluororesin.