JPH0741554U - Heating device - Google Patents

Abstract

(57) [Abstract] [Purpose] A flat-heater-type heating device suitable for developing heat-developable diazo heat-sensitive paper, which produces high-quality copied images without wrinkles on the heat-sensitive paper or deterioration of image quality. I will provide a. A sheet to be processed P supplied between a flat heater 4 and a backup roll 3 which is pressed against the flat heater 4 to rotate is driven by a frictional force of the backup roll 3 and slides on the flat heater 4. In the heating device for heat treatment, the discharge guide 6 is provided in the vicinity of the backup roll 3, and the sheet P that has been heat-treated between the flat heater 4 and the backup roll 3 is guided by the discharge guide 6 and is guided by the flat heater 4. The preheated backup roll 3 is discharged in a state of being approached.

Description

[Detailed description of the device]

The present invention relates to an apparatus for performing heat treatment such as heat development and heat fixing on a sheet to be treated such as paper and film, and further, heating of a flat heater type suitable for development of heat development type diazo thermal paper. It relates to the device.

[0002]

[Prior art]

 Conventionally, in order to perform heat treatment such as heat development and heat fixing on the sheet to be treated, a heating device of a heat roll type has been mainly adopted. The heating device of the heat roll type has a pair of rolls, a heat roll for heating the sheet to be treated and a backup roll for pressing the sheet to be treated against the heat roll. Then, the sheet to be treated is supplied between both rotating rolls and is heat-treated while moving in a pressure-bonded state to the heat roll. This backup roll is made of a material with a high elasticity, such as silicon rubber, so that the sheet to be processed can be pressed securely, and it is also called a soft roll.On the other hand, the heat roll does not conduct heat. In order to improve the quality, many aluminum pipes are coated with Teflon on the surface, which is also called a hard roll. Inside, a tubular heater lamp such as a halogen bulb is arranged along the axial direction.

When the required heating time is relatively short, such as heat fixing of a PPC or a laser printer, a predetermined heating time can be secured only by heating between a pair of rolls. When a heat treatment that requires a relatively long heating time is performed as in the case of developing a heat-developable diazo thermal paper, it is necessary to slow down the rotation speed of the roll, which causes a problem that the development time becomes long. In order to solve this problem, multiple backup rolls are placed around the heat roll, and a guide member is provided between the backup rolls, which is slightly separated from the peripheral surface of the heat roll. The heating time is extended by pressing it so that it wraps around.

In such a hot roll method, since it is processed at a relatively low temperature of about 120 to 130 ° C. and the heating time is long, it is possible to obtain a uniform and good copied image. However, since it heats a heat roll with a large heat capacity, it has a problem of long warm-up time and large power consumption. In order to meet the recent demand for high-speed processing, it is necessary to increase the size of heat rolls and backup rolls, resulting in higher weight and higher power consumption.

Therefore, recently, a heating device using a flat heater has been attracting attention. The flat heater type heating device is composed of, for example, a flat heater in which a heating resistor is screen-printed on an alumina substrate and a backup roll that rotates in pressure contact with the flat heater, and is supplied between the flat heater and the backup roll. The processed sheet is driven by the frictional force of the backup roll and is heat-treated while sliding on the flat heater.

Since the planar heater type heating device can reduce the heat capacity of the entire heating portion, the warm-up time can be shortened, and the structure can be simplified and the size and weight can be reduced. Further, since the sheet to be treated can be intensively and efficiently heated, it has advantages that it can be processed at high speed and consumes less power. However, when a heat treatment requiring a relatively long heating time is performed as in the case of developing a heat developable diazo thermal paper, a good quality copy image cannot be obtained only by a short time heating by a flat heater, It was found that it is necessary to heat the sheet to be processed from the back side by the heat of the backup roll preheated by the flat heater.

[0007]

[Problems to be solved by the device]

 As described above, the flat heater type heating device has a shorter heating time than the hot roll type heating device, and the sheet to be processed contacts the flat heater only for a short time. Therefore, at a high temperature of about 180 to 200 ° C. It is processed. Then, the sheet to be treated is immediately discharged from between the flat heater and the back-up roll and is exposed to the room temperature, so that the temperature of the sheet to be treated is rapidly changed. That is, the sheet to be processed receives a large heat shock. Therefore, the processed sheet shrinks and wrinkles, which deteriorates the image quality and adversely affects the copy quality. Particularly, when the sheet to be processed is a thin paper having a weak stiffness or a thin film used as the second base paper, such a problem becomes remarkable.

Therefore, the present invention provides a flat-heater-type heating device suitable for developing a heat-developable diazo thermal paper, which can obtain a high-quality copy image without wrinkling of the thermal paper or deterioration of the image quality. It is intended to be provided.

[0009]

[Means for Solving the Problems]

 In order to achieve such an object, according to the present invention, a sheet to be processed supplied between a flat heater and a backup roll which is pressed against the flat heater and rotates is driven by the frictional force of the back up roll to slide on the flat heater. In the heating device that heats while moving, a discharge guide is provided near the backup roll, and the sheet to be processed that has been heated between the flat heater and the backup roll is guided by the discharge guide and preheated by the flat heater. It is discharged in the state of approaching the backup roll.

[0010]

[Action]

 That is, the sheet to be processed is heated between the flat heater and the backup roll to reach a high temperature, and then discharged close to the backup roll preheated by the flat heater, so that the temperature of the sheet to be processed is rapidly lowered. No, the heat shock is moderated. Therefore, the contraction of the sheet to be processed is alleviated, a wrinkle does not occur on the sheet to be processed, and the image quality is not deteriorated, and a high quality copied image can be obtained.

[0011]

【Example】

 The present invention will be described in detail below based on the embodiments shown in the drawings. Fig. 1 shows a heat-developing diazo copying machine. In Fig. 1, a casing 1 injection-molded with synthetic resin has an inverted W-shape in which the upper part has two peaks 11 and 12 arranged side by side. The exposure device A is housed in the front mountain 11, and the heat developing device B, which is the heating device of the present invention, is housed in the rear mountain 12. The front slope 11a of the front mountain 11 is provided with an exposure inlet 13 for supplying the diazo photosensitive paper coated with the diazo sensitive material and the original image to the exposure apparatus A in a superimposed manner, and an exposure outlet 14 for discharging after the exposure. In addition, a development inlet 15 for separating the exposed diazo photosensitive paper from the original drawing and supplying it to the heat developing apparatus B is provided at the lower end of the front slope 12a of the rear mountain 12 to complete the heat development. The developing outlet 16 through which the paper is discharged is provided on the rear slope 12b of the rear mountain 12. A bottom plate 17 is attached to the lower surface of the casing 1 and accommodates drive motors (not shown) and electrical components constituting various control units, etc., inside the bottom plate 17.

A cylinder 21 made of transparent Pyrex glass is rotatably arranged in the exposure apparatus A, and a tube type that has a rating of 100 W along the axis and strongly radiates a wavelength of 420 nm is provided inside the cylinder 21. One fluorescent lamp 22 is arranged. An endless backup belt 25 is wound around the four idle rolls 23, one drive roll 24, and the cylinder 21, and the backup belt 25 holds the cylinder 21. When the drive roll 24 is driven and rotated by a motor (not shown), the cylinder 21 rotates in the direction of the arrow together with the backup belt 25.

Next, as a heating unit of the thermal developing device B, a heating device including a flat heater 4 and a backup roll 3 which is pressed against the flat heater 4 to rotate is arranged. An arc-shaped carry-in guide 5 and a discharge guide 6 are arranged along the outer peripheral surface of the backup roll 3, and a discharge roll 71 and a discharge plate 72 are arranged on the downstream side of the discharge guide 6. Then, the backup roll 3 and the discharge roll 71 rotate in the direction of the arrow by a motor (not shown). Further, the temperature sensor 8 comes into contact with the backup roll 3 so that the temperature of the backup roll 3 can be detected.

The structure of the flat heater 4 will be described with reference to FIG. 2. A heating resistor 42 having a width of 3 mm is screen-printed on the surface of an alumina substrate 41 having a width of 10 mm, and the surface is an overcoat layer 43. Is covered. The alumina substrate 41 is held by a heat resistant resin material 44 for preventing heat of the heat generating resistor 42 from escaping to other than the pressure contact portion, and the heat resistant resin material 44 has rigidity to withstand the pressure contact force of the backup roll 3 and the like. It is fixed to the support frame 45. Although the rated power of the heating resistor 42 is 1200 W, a thermistor (not shown) detects the temperature of the flat heater 4 and controls it to a predetermined temperature by phase control.

Next, the backup roll 3 is a long roll having an outer diameter of 40 mmφ and a length of 700 mm, and a foam sponge having a thickness of 8.5 mm is formed on the outer circumference of a stainless steel core pipe 31. The intermediate layer 33 made of silicon is disposed, and the intermediate layer 33 is covered with a solid layer 32 having a thickness of 2 mm and made of silicone rubber.

Then, the power switch (not shown) is turned on to energize the heating resistor 42 and rotate the backup roll 3, but the warm-up time elapses and the flat heater 4 heats the backup roll 3. When the roll 3 has risen to a predetermined temperature and can be duplicated, a copy OK message is displayed. After that, the diazo photosensitive paper coated with the diazo sensitive material is overlaid and inserted from the exposure inlet 13, and the backup belt 25 presses the cylinder 21 to move it, and in this process, the fluorescent lamp 22 that has passed through the cylinder 21 is transferred. Light passes through the original image to expose the photosensitive paper, and is discharged from the exposure outlet 14.

Next, when the diazo photosensitive paper, which is the sheet to be processed, is separated from the original drawing and supplied from the developing inlet 15, the diazo photosensitive paper P is guided to the carry-in guide 5 as shown in FIG. And the flat heater 4. Then, the diazo photosensitive paper P 1 is driven by the frictional force of the backup roll 3 and slides in a state of being pressed against the high temperature flat heater 4, and is heated by the flat heater 4 and the preheated backup roll 3 to be thermally developed. Then, the color is developed according to the original drawing.

Thereafter, the diazo photosensitive paper that has been colored according to the original drawing is guided to the discharge guide 6, the rotating discharge roll 71 and the discharge plate 72 and discharged from the developing outlet 16, but the arc-shaped discharge guide 6 is a backup. Since it is provided along the outer peripheral surface of the roll 3, the diazo photosensitive paper P that has been heated to a high temperature and moved close to the backup roll 3 preheated by the flat heater 4. Alternatively, it moves by touching the backup roll 3. Therefore, the temperature of the diazo photosensitive paper P does not drop sharply but gradually drops. That is, since the diazo photosensitive paper P does not receive a large heat shock, the contraction of the diazo photosensitive paper P is alleviated, the diazo photosensitive paper P is not wrinkled, and the image quality is not deteriorated. A duplicate image is obtained.

Although FIG. 3 shows another embodiment, the discharge guide 6 may be linear, and when the outer diameter of the back-up roll 3 is 40 mmφ, the temperature is 180 ° C., and the peripheral speed is 30 mm / s, When the angle θ of the discharge guide 6 with respect to the tangent line of the backup roll 3 was 30 ° or more, the effect of gradually cooling the diazo photosensitive paper P was recognized, and wrinkles did not occur, and good image quality was obtained.

[0020]

[Effect of device]

 As described above, in the flat heater type heating device of the present invention, the discharge guide is provided in the vicinity of the backup roll, and the sheet to be processed heated between the flat heater and the backup roll is discharged by the discharge guide. Since it is guided and discharged close to the backup roll preheated by the flat heater, the thermal paper does not wrinkle and the image quality does not deteriorate, and a good quality copy image is obtained and the thermal development type diazo thermal paper The heating device may be suitable for development. (Note) Teflon is a registered trademark in the detailed description of the device.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a heat development type diazo copying machine.

FIG. 2 is a sectional view of an embodiment of the present invention.

FIG. 3 is an explanatory diagram of another embodiment.

[Explanation of symbols]

 1 Casing 21 Cylinder 22 Fluorescent Lamp 3 Backup Roll 31 Core Pipe 32 Solid Layer 33 Intermediate Layer 4 Flat Heater 5 Carrying Guide 6 Discharge Guide

Front page continuation (72) Inventor Shigeo Kijima 262 Kondo, Tatebayashi, Gunma Gunma Ushio Electric Co., Ltd. (72) Inventor Hiroyuki Kushida 262, Kondo, Tatebayashi Gunma Gunma Ushio Electric Co., Ltd. (72) Taro Hayashi, 262 Kondo, Tatebayashi, Gunma Prefecture Gunma Ushio Electric Co., Ltd. (72) Inventor, Hiroshi Shimizu 262, Kondo, Tatebayashi, Gunma Gunma Ushio Electric Co., Ltd. (72) Yasushi Yao Nishiazabu, Minato-ku, Tokyo 2 chome 26-30 Fuji Photograph Shin Film Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A sheet to be processed supplied between a flat heater and a backup roll rotating in pressure contact with the flat heater is driven by frictional force of the backup roll and is heat-treated while sliding on the flat heater. In the heating device, a discharge guide is provided in the vicinity of the backup roll, and the sheet to be processed which is heat-treated between the flat heater and the backup roll is guided to the discharge guide and preheated by the flat heater. A heating device that is discharged in the state of being close to the.