JP3234661B2 - Heater device for fixing unit of plate making device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device applied to drying and fixing after a liquid developing process of a plate making machine, and more specifically, a fixing device having a heater applied to drying and fixing of a liquid toner of a plate making machine. Related to the device.

[0002]

2. Description of the Related Art Conventionally, plate material is fixed by a heater plate in the process of passing the plate material, in which the plate passes over a hot surface, and at this time, the wind of a fan promotes the evaporation of the liquid toner, and the amount of heat provided by the heater is used for fixing. It is configured to be. In order to prevent the plate surface from being lifted, the plate is pressed by the wind pressure of a fan or the number of pressing rollers is increased to prevent the plate surface from rising, but none of these methods has obtained good results. As shown in FIG. 3, the edge of the plate that is not pressed by a roller or the like (the portion indicated by Q in the figure) sometimes rises, and such a state causes unevenness or insufficient fixing. By reducing the length indicated by R in the drawing (narrowing the heater width), the area where the fixing property is reduced can be narrowed, but if it is too short, a sufficient amount of heat cannot be supplied.

[0003]

As a conventional plate material fixing device using a heater plate, there is a type in which a plate passes over a hot surface in a process of passing the plate material and is fixed by a given amount of heat at that time. It is not preferable that the plate surface rises as described with reference to FIG. For this reason, if the air pressure of the fan is too high, unfixed toner will flow, or pressing with a roller while the plate surface is dry will rub the toner, thereby deteriorating the printing surface quality. There is also a maintenance problem such as a change in the material of the roller, which is caused by the toner sticking to the pressing roller. This was the same with the use of the heater roll. An object of the present invention is to solve the problem of the plate material fixing device by the heater plate by arranging the heaters, setting the feed speed of the rollers, and so on, to prevent uneven and insufficient fixing of the plate to achieve uniform and reliable fixing. An object of the present invention is to provide a heater device of a fixing unit of a plate making apparatus which can perform the heating.

[0004]

In order to achieve the above object, a heater device of a fixing unit of a plate making apparatus according to the present invention comprises a fixing device of a plate making apparatus which transports a plate developed in a developing unit to a fixing unit and heats and drys the plate. A squeezing roller for squeezing the toner of the plate material developed with the liquid toner in the developing unit and further conveying the toner to the fixing unit; and a first and a second heater provided in the fixing unit. Plate and
A feed roller provided between the first and second heater plates, a fan provided on the first heater plate, and a discharge roller provided at a discharge port of the second heater plate; A press roller provided between the feed roller and the discharge roller to press the plate against a second heater plate, and configured to convey the discharge roller, the feed roller, and the squeeze roller in the order of increasing the feed speed. ing.

[0005]

According to the present invention, the fixing portion is divided into two parts, and the pre-drying heater (first heater plate) and the pre-drying heater which do not touch the plate surface at all are almost fixed, and then the fixing property is further enhanced positively. A pair of feed rollers are placed between the main drying heaters (second heater plates). The feed roller has a developing roller on the pre-drying heater side and a discharge roller on the main drying side, and the peripheral speed ratio of the rollers is that discharge roller> feed roller> throttle roller little by little. Plates are always under tension. For this reason, by setting the surface of the heater plate to a position slightly pushed up from the back surface with respect to the state where the plate material is stretched, the plate material can be fed while the heater and the back surface of the plate material are in close contact with no gap (see FIG. 2). The pre-drying heater (first heater plate) has a width necessary and sufficient for sufficiently drying the raw dry surface so that the image portion is not affected even if the pressing roller or the like comes into contact with the pre-drying heater. Heater plate)
Is characterized in that the heater width is made as short as possible in order to reduce the fixing loss portion after the rear end of the plate is separated. The lifting of the trailing edge of the plate at the pre-drying heater (first heater plate) is backed up by the main drying heater (second heater plate), and there is no problem if the heater width is somewhat narrow. In this case, by reducing the width of the heater, the portion where the fixing property is reduced by floating is narrowed, and the portion where the fixing property is reduced outside the plate making effective stamp surface is reduced. In the main drying portion (second heater plate), the plate surface is in a state of sufficiently withstanding the pressure from the surface, so that the nip of the feed roller is removed to improve the fixability of the rear end of the plate. By installing a pressing roller that suppresses the lifting and lightly pressing the surface of the plate, it is possible to obtain sufficient fixability up to the rear end of the plate.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of a heater device of a fixing unit of a plate making apparatus according to the present invention, and FIG. 2 is a schematic diagram showing a positional relationship between each transport roller and a heater plate of the embodiment device. A plate material exposed on an exposure table (upper right of the developing unit 1) of the plate making apparatus, which is omitted in FIG. 1, is sent to the developing unit 1 and is subjected to development processing by liquid toner in the developing unit 1. The developing unit 1 is provided with a spray nozzle and an electrode plate. The surplus toner liquid is squeezed out by the squeezing roller 2 from the plate material wet in this process. The plate in this dry state is guided to the first heater plate 4 of the fixing unit 10 by the guide plate 3. A fixing fan 9 is disposed on the first heater plate 4 and has an opening angle slightly in the direction of the paper discharge tray in order to prevent the plate from floating and to promote the subsequent drying of the plate surface. Thus, wind is blown toward the first heater plate 4. Feed roller 5 at the end of plate
However, since the feed roller 5 has a higher peripheral speed than the squeezing roller 2, tension is generated between the two rollers and the plate material is stretched. FIG. 2 shows the nip point between the squeezing roller 2 and the feed roller 5 by connecting them with broken lines. The surface of the first heater plate 4 lies on this broken line. When the first heater plate 4 reaches the feed roller 5, the plate surface has a heater width necessary and sufficient to dry the plate image portion sufficiently so as not to be damaged by contact. Therefore, since a force is generated on the plate to press the first heater plate 4, the drying efficiency can be significantly increased.
In FIG. 2, P indicates the amount of pressing against the back surface of the plate material.

[0007] Then the plate was tip is nipped by the discharge roller 7 passes through the second heater plate 6 is plate discharge <br/> the sheet discharge tray 11. Also at this time, since the discharge roller 7 has a higher peripheral speed than the feed roller 5, tension is generated between the two rollers, and in this state, the second heater plate 6 set so as to slightly press against the back surface of the plate material. Thereby, the drying efficiency can be significantly increased. Second heater plate 6
After the nip of the feed roller 5 is separated from the rear end of the plate, the plate tends to be lifted with respect to the heater plate 6 due to the curl of the plate material, and the fixing property tends to be slightly lowered. , The area where fixing is insufficient is narrowed. The press roller 8 presses the plate surface against the heater when the plate is lifted, and functions to further narrow the insufficient fixing portion at the rear end of the plate. By applying a surface treatment such as Teflon coating on the first and second heater plates, the adhesion of the liquid toner can be reduced, and the wiping property can be improved during maintenance.

[0008]

According to the present invention, it is possible to avoid unnecessary contact with the surface of the plate when the plate is dry-dried, and to remove the plate from the dry-dry state before feeding the roller 5.
By placing the plate, tension is applied to the plate material, and by using the tension, the lifting of the plate with respect to the heater plate is positively suppressed, and the heat of the heater can be effectively used for fixing the plate. Furthermore, since there is nothing to touch the raw dry plate surface, there is no damage to the image on the plate surface, so that the quality of the stamp surface can be improved. However, in the state where the nip of the roller is lost (when the rear end of the plate is separated from the roller), the plate is lifted due to the curl of the plate, and a portion where the fixing property is substantially reduced with respect to the heater width is generated. 1
It is not possible to improve the fixability of this lowered portion by using only one heater. For this reason, a second heater plate for applying tension to the same plate material is provided, and by shortening the heater width, it is possible to minimize the generation region of the above-mentioned portion where the fixing property is reduced, thereby effectively improving the plate surface. This lowered portion can be pushed out of the stamp face. In this part, since the plate surface is already sufficiently dried, a holding roller may be provided on the heater plate, which can further improve the fixability of the rear end of the plate having no nip. became. The combination of the two heaters enables high-speed processing without damaging the plate material.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a heater device of a fixing unit of a plate making apparatus according to the present invention.

FIG. 2 is a schematic diagram showing a positional relationship between each transport roller and a heater plate of the embodiment apparatus.

FIG. 3 is a schematic diagram for explaining a problem that occurs in a conventional device.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Atsushi Yano 3-4-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Paper Mills (72) Inventor Tatsumi Shiomi 1-35-1, Izumi-Honmachi, Komae-shi, Tokyo Tokyo Aircraft Instruments Co., Ltd. (56) References JP-A-59-3450 (JP, A) JP-A-54-158935 (JP, A) JP-A-2-62547 (JP, U) JP-A-59-66256 ( JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G03G 13/26-13/32 G03G 15/20

Claims (1)

(57) [Claims] 1. A heater device of a fixing unit of a plate making apparatus for conveying a plate developed in a developing unit to a fixing unit and heating and drying the plate, wherein the toner of the plate material developed by the liquid toner in the developing unit is squeezed. A squeezing roller for conveying to a fixing unit; first and second heater plates provided in the fixing unit; a feed roller provided between the first and second heater plates; A fan provided on the heater plate, a discharge roller provided at a discharge port of the second heater plate, and pressing the plate against the second heater plate provided between the feed roller and the discharge roller. A fixing roller of the plate making apparatus, wherein the fixing roller includes a pressing roller, and is configured to convey the sheet at a higher feeding speed in the order of the discharge roller, the feed roller, and the squeezing roller. Over the other apparatus.