JPS60255498A - Picture transfer device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image transfer device, and particularly to an image transfer device suitable for creating a proof in a plate-making process.

(Prior art) When printing a large number of sheets by creating a printing plate using a plate-making material such as 28 plate from a color original, the color original is usually converted into a 4-color halftone negative (or halftone positive) using a color scanner or the like. After creating, pasting, turning, retouching, etc.
A four-color one-sheet positive is created, a proof is printed, and the final print is made after checking the finish. In this case, in the process of creating a net negative or net positive, check the disassembly of the scanner,
Checking functions such as checking pasting etc. in the process of creating a single-sheet positive, and checking the person who ordered the printing in the proofing process are necessary for a good print finish, and color proofs are created for this purpose. A check is being carried out. The photosensitive materials used to create this color proof include silver halide photosensitive materials, electrophotographic photosensitive materials,
Photo 4 Photosensitive materials using reamers are known, some use pigments or dyes for color images, and there are both negative-positive and positive-positive methods depending on the purpose of use. An example of a method for creating such a color proof is as follows. First, the photosensitive layer of a photosensitive material having a photosensitive layer on a support is transferred to a transfer paper by pressure and heating, and image exposure and development are performed to form a first color image on the transfer paper. Next, a second photosensitive layer is transferred thereon in the same manner, imagewise exposed and developed to form a second color image on the same transfer paper. This operation is repeated a total of four times for yellow, magenta, cyan, and black to form a multicolor image.

In this case, the photosensitive layer is transferred onto the transfer paper by various methods, such as by simply applying pressure, or by applying pressure and heating at the same time. For example, one of the roller pairs or Both are used as heat rollers, and a photosensitive material having a photosensitive layer and a transfer paper are passed between them in a stacked state, thereby transferring the photosensitive layer.

In the present invention, the Shikara Giroux 7 is produced by subjecting a photosensitive material to imagewise exposure and, after development, transferring the resulting image to an image-receiving sheet. In this case, a multicolor image is created by creating yellow, magenta, cyan, and black color images using four sheets of photosensitive material, and sequentially transferring these to the same image-receiving sheet.

In this method, unlike a method in which an image is formed by exposing a photosensitive layer transferred onto a transfer paper, the formed image is sequentially transferred one color at a time, so it is necessary to precisely transfer each image. That is, the image transferability in this case is greatly influenced by the transfer temperature, so it is necessary to strictly maintain the temperature during transfer.

Conventionally, when using a commonly used transfer device, the heating time is short, so it is necessary to raise the temperature extremely, and the sheet inserted between the rollers is partially stretched, causing the transfer image to deteriorate. This method has disadvantages in that it causes color shift and uneven transfer.

Furthermore, since it is necessary to raise the temperature extremely as described above, it is necessary to increase the heat capacity of the heater, which has the disadvantage of increasing the size of the apparatus. Furthermore, when the superimposed sheets are inserted between a pair of heat rollers, there is a drawback that the temperature of the heat roller decreases locally, resulting in color shift in the transferred image. In other words, although it depends on the size of the sheet on which the image is transferred, generally the heat roller rotates several times while the sheet passes through the transfer device, so that the part of the sheet that first touches the roller and the part that touches the roller from the second time onwards The surface temperature of the roller differs at the part in contact with the roller. As a result, there is a drawback that the transfer temperature decreases as the 'b-ra rotates, causing transfer blemishes. Furthermore, as described above, since four image sheets are normally transferred to one image-receiving sheet, there is a drawback that color misregistration is likely to occur for each color.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and provides a transfer device for creating color proofs that smoothly transfers images and does not cause transfer unevenness or color shift. The purpose is to

(Structure of the Invention) The object of the present invention is to superimpose an image sheet on which an image is formed and an image-receiving sheet that receives the image, and in an image transfer device that transfers the image, prepare a preheating device for heating the superimposed sheets. a heating section, a heat roller that performs image transfer by heating and applying pressure at the same time as conveying the stacked sheets heated in the preheating section; an image transfer device including a cooling roller for cooling, a cooling section for further cooling the stacked sheets cooled by the cooling roller, and an image sheet on which an image is formed and an image receiving sheet for receiving the image. In an image transfer device that transfers the image by superimposing the superimposed sheets, a heat roller that heats and presses the superimposed sheets at the same time as conveyance, and an auxiliary heating section that heats the surface of the heat roller are provided. This is achieved by an image transfer apparatus characterized in that the auxiliary heating section is operated so as to heat only the area where the surface temperature of the heat roller has decreased upon insertion of the sheet.

The present invention will be described in detail below based on embodiments illustrated in the drawings.

FIG. 1 is a schematic side view showing one embodiment of the present invention.

In FIG. 1, an image sheet on which an image is formed and an image-receiving sheet are overlapped and inserted from an insertion row 22. In this case, a thin plate for reinforcing and guiding the image sheet and the image-receiving sheet or a protective cover 7 may be further overlapped. In this case, the reinforcing and guiding thin plates are preferably made of aluminum or other thin plates with good thermal conductivity.

The transfer device 1 includes a non-contact or contact type sensor 11 that detects the insertion of the stacked sheets and operates the transfer device 1, and a sensor 11 that pinches the stacked sheets.
A pair of insertion rows 22 that insert the sheets into the apparatus and feed them into the apparatus, a plate heater 3 of a preheating section that heats the stacked sheets fed by the insertion loader 2 to about 50° to 80°C, and the plate. While the stacked sheets heated by the heater 3 are sandwiched and conveyed, the sheets are further heated for about 15 minutes.
A pair of heat rollers 4 heat to about 0°C and apply pressure to transfer the image, and the heat rollers 4 sandwich and convey the stacked sheets on which the image has been transferred to a certain temperature. A pair of cooling rollers 7 that are lowered, a cooling plate 8 and a cooling fan 1 which are cooling units that further cool the stacked sheets cooled by the cooling rollers 7.
0 and a temperature sensor 5 that controls the temperature of the heat roller 4.
and a slit nozzle 9 that blows cold air onto the cooling roller 7, and the heat from the heat roller 4 is transferred to the cooling roller 7.
It consists of a heat insulating member 611/ that prevents heat transfer to.

The insertion row 22 is provided near the plate heater 3 so that the upper roller has a fixed angle θ with respect to the lower roller. By feeding while contacting with 3,
The stacked sheets are configured to be easily heated. The plate heater 3 serves as a heat roller 4 when the heat roller 4 processes the stacked sheets.
It has the effect of reducing the temperature drop in the heat treatment, and also has the effect of avoiding rapid heating treatment by preheating 9, and is controlled to an appropriate temperature by the temperature sensor 5.

The heat roller 4 is rotatable by having a heater such as a nichrome wire or a heat radiation lamp (for example, a halogen lamp) in the center thereof, and performs transfer by heating and pressurizing the stacked sheets. It is preferable that the treatment is carried out reliably, and that the material of the surface thereof is made of heat-resistant rubber or metal. The temperature of the heat roller 4 is controlled by the temperature sensor 5 to a temperature suitable for transfer processing, but the heat roller 4 is further controlled by side radiation heat to prevent the roller surface temperature from decreasing each time the stacked sheets pass. Auxiliary heating means, such as e.g. heat emitting lamps, may be provided to heat the roller surface.

The cooling row 27 serves to cool the heated stacked sheets so that they can be easily handled when the heated stacked sheets are continuously processed.

In other words, in the normal color proof creation process,
Four-color transfer processing is performed, but in this case it is necessary to repeat the same process four times, and the cooling roller 7 is provided to improve the workability. The cooling roller 27 is made of heat-resistant rubber or metal, and the surface of the cooling roller is cooled by cold air blown from the slit pipe 9.

Although the surface of the cooling row 27 is cooled by cold air, the cooling roller 7 may be configured to pass a refrigerant or cold air therethrough.

The cooling plate 8 may be made of a metal with good thermal conductivity, such as aluminum, and may be cooled by passing a coolant inside the plate. Further, the cooling fan IO has the function of cooling the stacked sheets from above and cooling the cooling plate 8.

Further, a contact type, photoelectric type, or other type of detection sensor may be provided to notify that the stacked sheets have been discharged onto the cooling plate 8.

In the embodiment described above, one pair each of the heat roller 4 and the cooling roller 7 are provided, but the present invention is not limited to this, and it goes without saying that a plurality of pairs may be provided. Further, although the operation of the transfer device 1 is started by the sensor 11, it goes without saying that a manual switch may also be used.

The heat insulating member 6 is the plate heater 3 or the heat roller 4.
This is a member for preventing heat transfer between the cooling roller 7 or the cooling plate 8, and is made of a stainless steel plate, a plastic plate, foamed plastic glass wool, or a composite member thereof.

FIG. 2 shows the embodiment shown in FIG. 1 in which an auxiliary heating means 12 is provided. The auxiliary heating means 12 is configured to increase the surface temperature of the heat roller 4 by inserting the sheet.
This is provided to prevent a local drop in temperature, and is activated depending on the surface temperature of the heat roller 40 detected by the temperature sensor 5.

Alternatively, the actuation may be performed by detecting the sheet by the sensor 11 in the sheet insertion section.

The auxiliary heating means 12 is composed of a heater, but may be provided with a reflector plate to effectively reflect the radiant heat. The heater may be a heat emitting lamp such as a halogen lamp as well as a nichrome wire. Furthermore, the auxiliary heating means 12 is provided to prevent the surface temperature of the heat roller 4 from decreasing locally due to the insertion of the sheet. Auxiliary heating means 1 is where the temperature has dropped
2 (in the example in Figure 2, after the leading edge of the sheet reaches the heat roller 4, the heat roller reaches approximately 3
/4 rotations), the trailing edge of the sheet leaves the heat roller 4, and when the heat roller portion that was in contact with the trailing edge of the sheet reaches the auxiliary heating means (in the example in Figure 2, the sheet Approximately 3 minutes after the rear end leaves the heat roller
/4 rotations) It is preferable to stop the operation. For this purpose, the above operation may be performed by combining sheet detection by the sensor 11 and a timer, or a similar operation may be performed by a separately provided sensor. In addition, if the temperature sensor 5 is installed at the center of the heat roller 4 in the width direction, it may be difficult to control the temperature due to the disturbance in temperature caused by inserting the sheet. It is preferable to provide the

The embodiment shown in FIG. 2 is the same as that shown in FIG. 1 except for the auxiliary heating means 12.

(Effects of the Invention) As described above, the transfer device 1 of the present invention can automatically and continuously perform the steps of the transfer process from inserting the stacked sheets to cooling, thereby improving the workability of the transfer process. It can be improved.

Further, the transfer device 1 is configured such that the superimposed sheets are preheated by the plate heater 3 or both the plate heater 3 and the auxiliary heating means 12 and then sent to the heat roller 4. If the local α temperature drop of the heat roller 40 can be suppressed and stabilized at the time, rapid heating of the sheet can be avoided,
Transfer bugs can be prevented.

Further, according to the transfer device 1, the conditions during the transfer process of the stacked sheets, for example, the temperature of the heat roller 4 when the transfer process is repeated can be kept constant with high accuracy. , for example, problems such as color shift will no longer occur.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of essential parts showing one embodiment of the present invention. FIG. 2 is a schematic side view of the main parts of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1--Transfer device, 2--Insertion roller, 3--Plate, 4--Heat roller, 5--Temperature sensor, 6--Insulating material, 7--Cooling roller, 8...Cooling plate, 9...Suit pipe, 10...Cooling fan, 11...Sensor, 12...Auxiliary heating means. Agent: Patent attorney (8107) Kiyotaka Sasaki C and one other person Figure 1) C) 2 Amendment to Figure Procedures July 7, 1980 Patent Application No. 112021 of 1980 2, Title of Invention Image Transfer Device 3 , Person making the amendment Relationship to the case: Patent applicant name (520) Fuji Photo Film Co., Ltd. Kasumigaseki Building Post Office PO Box No. 49 Eiko Patent Office Telephone (581)-9601 (Representative) Showa Year, Month, Day (Delivery) 6. Number of inventions increased by amendment 0 0 Page 6, line 8 of the specification, "The disadvantage of the device is that it is large and bulky" is changed to "The device is not only large, but also has a large electric power." It had the disadvantage of requiring large capacity.'' 0 Same page 9, line 1 from the bottom, "constant angle θ" is corrected to "has a constant angle θ." 0 Same page 11, line 1, "secondary radiation heat" is corrected to "radiant heat." 0 Same page 12, lines 4-5, "photoelectric type, etc." is corrected to "or non-contact type, such as photoelectric sensor." O Same, page 16, line 7 from the bottom, "The surface temperature has decreased" is corrected to "The surface temperature has decreased." O Same page 14, lines 6 to 2 from the bottom, correct "the superimposed sheet, the plate" to "the superimposed sheet, the plate".

Claims (6)

[Claims] (1) In an image transfer device that superposes an image sheet on which an image is formed and an image receiving plate that receives the image and transfers the image, a preheating section that heats the superimposed sheet; a heat roller 2 that performs image transfer by heating and applying pressure at the same time as conveying the overlapping sheets heated by the heat roller; a cooling roller that cools the overlapping sheets while conveying the image transferred by the heat roller; An image transfer device in which cooling units are successively arranged to further cool the stacked sheets that have been cooled by rollers. (2) In an image transfer device that overlaps an image sheet on which an image is formed and an image-receiving sheet that receives the image and transfers the image, a heat roller that heats and presses the overlapped sheet at the same time as the sheet is conveyed; An auxiliary heating section for heating the surface of the heat roller is provided, and the auxiliary heating section is operated so as to heat only the portion where the surface temperature of the heat roller has decreased when the superimposed sheets are inserted. Features of the image transfer device. (3) In the description of item 1 above, an auxiliary heating section is provided to heat the surface of the heat roller, and heating is performed only at a portion where the surface temperature of the heat roller has decreased due to insertion of the stacked sheets. . An image transfer device characterized in that the auxiliary heating section is operated. (4) The image transfer device according to Items 2 and 3 above, wherein the auxiliary heating section is activated by a detection signal from a sheet detection sensor. (5) The image transfer device according to the above items 2 and 3, wherein the auxiliary heating section is operated by a detection signal from a sheet detection sensor and a timer. (6) Image transfer according to the above items 2 and 3, characterized in that the operation of the auxiliary heating section is performed using a temperature sensor that detects the surface temperature of the heat roller. Device. (Force) The image transfer device according to item 6, wherein the temperature sensor is provided so as to be in contact with a portion of the surface of the heat roller that does not contact the sheet.