JPH0717051B2 - Cooling / heating device for ink fountain of printing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling / heating device for an ink fountain of a printing press, and particularly to heating or cooling the ink stored in the ink fountain by using an electronic cooling element for generating cold heat by the Peltier effect. Concerning the structure of the ink fountain.

[0002]

2. Description of the Related Art In an ink supply device of a printing machine, for example, in an offset or letterpress printing machine, a plurality of ink rollers are arranged between an ink fountain and a plate cylinder, and the ink is sequentially transferred to an adjacent roller surface by a rotary contact to form a plate. It is applied to the body plate. Rolling friction occurs when such a roller rotates while making contact, and the temperature of the ink on the roller rises due to the frictional heat. The ink specifications define the usage environment such as the optimum temperature and temperature range. For example, in the case of offset printing, the ink temperature is generally 25 ^0.
It is said that the proper temperature is around the front and back. Therefore, if the surface temperature of the ink roller deviates from the environment in which the ink is used due to the above-mentioned rolling friction, it becomes a factor that deteriorates the printing quality. Especially in cold regions, when the room temperature is low, it is necessary to idle the printing machine at the beginning of work until the temperature of the ink reaches an appropriate temperature, which lowers work efficiency.

Against this background, a roller cooling / heating technique has been developed for suppressing an increase in the surface temperature of the roller to attain an appropriate temperature. Roller cooling of conventional printing machines is performed by various methods such as a water cooling type in which water such as ground water is circulated in the rollers, a refrigeration cycle type in which heat is exchanged with cooling water or refrigerant flowing in the rollers, and a heat pipe type. It is being appreciated. As a device of this type, a cylinder cooling device using a refrigeration cycle system is disclosed in, for example, Japanese Patent Laid-Open No. 63-5944. A cooling and heating device for an ink roller using an electronic cooling / heating element is disclosed in Japanese Patent Application No.
No. 38962.

[0004]

By the way, in order to manage the ink at an appropriate temperature, heating / cooling of the ink roller is not sufficient. As a more preferable measure, even in the ink fountain for storing the raw ink, the temperature of the ink is previously set. It is desirable to control However, the ink fountain equipment is required to be made very small due to the mounting space, and there is a problem that it is not possible to easily manage the ink fountain at an appropriate temperature. An object of the present invention is to provide an ink fountain cooling / heating device of a printing machine which is small in size and whose ink temperature can be easily controlled. Another object of the present invention is to provide an ink fountain cooling / heating device of a printing press, in which cooling energy of an electronic cooling element is applied to heating or cooling of ink with high efficiency.

[0005]

In order to achieve the above object, the cooling / heating device for an ink fountain of a printing machine according to the present invention has an electronic cooling element by a Peltier effect arranged in an ink reservoir member. In the other one, an electronic cooling / heating element is arranged directly on the back surface of a doctor blade provided on the ink fountain substrate or via a cooling / heating plate. Further, the other one is provided with a plurality of electronic cooling / heating elements arranged by the Peltier effect on the ink reservoir member, a sensor for detecting the surface temperature of the cooling / heating plate, and means for controlling the current of the electronic cooling / heating element by the sensor output. It is equipped with. In addition, another one is a plurality of electronic cooling / heating elements arranged directly on the back surface of the doctor blade or via a cooling / heating plate, the electronic cooling / heating elements are divided into a plurality of groups, and a sensor for detecting the ink temperature at a plurality of points, And a means for controlling the current of the electronic cooling and heating elements of each group by the output of each sensor. Still another one is provided with a duct portion formed by the ink fountain substrate and the lower surface of the doctor blade, and means provided in the duct portion and blowing out cool air / warm air toward the electronic cooling element. Others include a heat exchange system that uses a fluid as a medium for radiating heat from the electronic cooling element, and this heat exchange system is composed of a water-cooled heat exchanger that cools the electronic cooling element. .

[0006]

When an electric current is applied to the electronic cooling / heating element, cold heat is applied to the ink reservoir member such as a doctor blade to cool or heat the ink to adjust the ink temperature. At this time, the ink temperature is maintained at an appropriate value by adjusting the cooling energy by controlling the current to the electronic cooling element. By arranging the electronic cooling / heating elements on the back surface of the doctor blade directly or through the cooling / heating plate in a dense and dense manner, when the same current is applied, the cooling / heating energy according to the size of the element density is given to the doctor blade, and the temperature of the ink The distribution is made uniform. Further, the temperature distribution of the ink can be made uniform in the same manner as described above by group-controlling the electronic cooling / heating elements according to the ink temperature distribution.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the structure of an ink fountain that is reversibly heated or cooled using an electronic cooling element. The ink fountain 1 is rotatably supported by a frame 2 of the machine, and is composed of an ink take-out roller 3 for taking out a fixed amount of ink, and an ink reservoir 4 for closing the one side with the ink take-out roller 3 to store the ink to be used. ing. An ink fountain base 5 is fixed to the machine frame 2, and an ink fountain base 6 is provided on the ink fountain base. As shown in FIG. 2, the ink fountain substrate 6 faces the substantially entire length of the inking roller 3 and extends to the lower side of the inking roller 3, and the inclined doctor blade mounting surface 7 and substantially the doctor blade mounting surface 7 A recess 8 is provided at the center.
In addition, a doctor blade 9 is provided in the depression 8 of the ink fountain substrate.
A plurality of electronic cooling / heating elements 11 for heating or cooling the ink 10 in the ink reservoir 4 are provided via the. A right side plate 12 and a left side plate 13 forming the side surface of the ink fountain 1 are attached to the ink fountain base 6, and the front parts of the side plates 12 and 13 are roller surfaces near both ends of the ink discharge roller 3. And a hole 14 for making the hollow portion 8 of the ink fountain substrate communicate with the outside.

On the doctor blade mounting surface 7, a doctor blade 9 is fixed by a blade pressing plate 15 to the ink fountain substrate 6 on the side away from the ink discharge roller. Both sides of the doctor blade 9 are right and left side plates 1
They are in contact with the inner side surfaces of Nos. 2 and 13, and their front portions are arranged so that they can come into contact with the lower surface of the inking roller 3.
By moving the front portion of the doctor blade against the elasticity of the blade itself by a plurality of adjusting screws 16 provided at equal intervals in the longitudinal direction of the doctor blade, and changing the distance between the lower surface of the inking roller and the doctor blade, The amount of ink discharged is adjusted for each part of the discharge roller. Here, the ink fountain substrate 6, the ink discharge roller 3, the doctor blade 9 and the side plates 12 and 13 are members for forming the ink reservoir 4. The doctor blade 9 is composed of one piece (FIG. 1) or divided into a plurality of pieces (FIG. 3), and each blade can be adjusted by an adjusting screw 16.

The electronic cooling / heating element 11 has a cooling side in close contact with the back surface of the doctor blade and a radiator with fins 1 on the radiating side.
7 (see FIG. 2) and a radiator (see FIG. 8) for forcibly flowing the heat medium to radiate heat are provided. A heat insulating material 18 is laid between the respective elements to prevent heat radiation from the back surface of the doctor blade that does not contribute to cooling or heating. As shown in FIG. 7, the electronic cooling / heating element 11 includes a controller 20 and a lead wire 21.
And the direct current from the DC power source 22 is applied via the control unit 20. The control unit 20 controls the cold energy according to the direction and magnitude of the supplied current. When the temperature is controlled with high accuracy, the temperature of the ink stored in the ink reservoir 4 is detected at several points by a plurality of temperature sensors (not shown), and this sensor output (reference numeral 23)
The current supplied is controlled according to the difference between the temperature and the set temperature.

The electronic cooling / heating element 11 is attached by a method in which the cooling / heating surface is directly or indirectly attached to the doctor blade 9. As shown in FIG. 2, a cold heat plate 19 having good thermal conductivity is used for indirect attachment, and the cold heat plate 19 is closely fixed to the cold heat plate 19. Then, the cooling / heating plate 19 is attached to the ink fountain substrate 6 so as to cover the recess 8. At this time, the front surface of the cooling / heating plate 19 is brought into contact with the back surface of the doctor blade 9, and the doctor blade 9 is heated or cooled via the cooling / heating plate 19. Further, as shown in FIG. 4, the direct attachment is fixed by directly contacting the cold heat surface of the electronic cold heat element 11 with the back surface of the doctor blade 9 without using a cold heat plate. By mounting the doctor blade 9, a heat radiation space (duct portion) of the electronic cooling / heating element 11 is formed in the hollow portion 8, and the duct portion is opened to the outside by the holes 14 of both side plates.

The electronic cooling and heating elements are arranged in a matrix as shown in FIG. 5, and preferably the holes 1 of the side plates 12 and 13 are arranged to make the temperature distribution of the ink uniform.
The element spacing S near 4 is narrowed, and this element spacing is gradually widened toward the center. By arranging in this way, the number of elements per unit area increases near the side plate (dense) and decreases toward the center (coarse),
Cooling energy can be uniformly applied to the entire ink fountain substrate. In this case, all the elements can be controlled in the same manner, so that the circuit configuration becomes simple. As another arrangement example, as shown in FIG. 6, elements are arranged at equal intervals, divided into several blocks from the side plate to the center, and each block is provided from a sensor provided at a plurality of locations for detecting ink temperature. It can also be configured to perform group control by output. In the case of a divided doctor blade, an appropriate number of electronic cooling / heating elements are selected and arranged for each blade. In this embodiment, only the doctor blade is used as the ink reservoir member for arranging the electronic cooling / heating element, but it is also possible to adopt a structure in which it is arranged inside the ink discharge roller and the agitator for flowing the ink, and on the side plates 12 and 13. it can. In this embodiment, in order to make the temperature distribution of the ink uniform, the group control is performed by the arrangement of the electronic cooling / heating elements and the sensor output, but it is also possible to combine an agitator. Next, the heat dissipation of the electronic cooling element will be described. In order to improve the thermal efficiency on the cooling side, the electronic cooling element needs to cool or heat the radiating side, which can be done by natural convection or forced ventilation by air (cold air, warm air, indoor air), or water (cooling). There is a flow of water, hot water). It should be noted that when cooling or heating the ink, it is performed with the same configuration, for example, by passing cooling air or warming air through a duct portion in the ink substrate, so only cooling will be described here. Is omitted.

In the case of air cooling, as shown in FIG. 7, air is sent from the hole 14 of one side plate to the duct portion by the blower fan 30 to cool the electronic cooling element and then exhausted from the hole of the other side plate. In the case of using cooling water, as shown in FIG.
The heat transfer body 40 in which 1 is embedded is arranged, and cooling water is passed through this water pipe to cool it. FIG. 9 shows a schematic configuration of a closed-loop heat exchange system for supplying cooling water to the heat transfer body. The return water from the water pipe 41 of the heat transfer body 40 is the heat exchanger 4
2 exchanges heat to generate cooling water, and this cooling water is pumped by the pump 4
In step 3, it is supplied to the heat transfer body 40 and returns to the heat exchanger 42 again as return water.

Next, cooling of the ink will be described. When the electronic cooling / heating element 11 is energized via the controller 20, cooling heat is given to the back surface of the doctor blade to cool the ink. At this time, the cooling energy is adjusted by controlling the current to the electronic heating / cooling element 11, and the ink temperature is maintained at an appropriate value.

[0014]

As described above, according to the present invention, since the structure in which the ink fountain is cooled or heated by the electronic cooling / heating element is adopted, the apparatus is downsized and there is no mechanical vibration source. There is no noise. Also, since the arrangement and number of electronic cooling / heating elements can be easily selected according to the temperature distribution of the ink, the temperature of the ink can be easily controlled, and the current to the electronic cooling / heating elements can be controlled to achieve a uniform and appropriate ink temperature. It can be adjusted.

[Brief description of drawings]

FIG. 1 is an external view of an ink fountain cooling / heating device of a printing machine of the present invention.

FIG. 2 is a sectional view of an ink fountain.

FIG. 3 is an external view of an ink fountain cooling / heating device configured by a divided doctor blade.

FIG. 4 is a cross-sectional view for explaining another embodiment of mounting the electronic heating / cooling element.

FIG. 5 is a view for explaining the arrangement structure of the electronic cooling and heating elements.
FIG. 9 is a sectional view taken along line AA of FIG.

FIG. 6 is a cross-sectional view taken along the line AA of FIG. 2 for explaining another embodiment of the arrangement structure of the electronic cooling and heating elements.

FIG. 7 is a diagram for explaining control and cooling of an electronic cooling element.

FIG. 8 is a sectional view showing a cooling structure of an electronic cooling element with cooling water.

FIG. 9 is a diagram for explaining cooling of an electronic cooling element by a heat exchange system.

[Explanation of symbols]

 1 Ink fountain 3 Ink fountain roller 4 Ink fountain part 6 Ink fountain base 8 Heat dissipation space 9 Doctor blade 10 Ink 11 Electronic cooling / heating element 16 Doctor blade adjustment screw 17 Radiator fin radiator 18 Insulation material 19 Cooling plate 40 Heat transfer element

Claims (12)

[Claims] 1. An ink fountain cooling / heating device of a printing machine, wherein an electronic cooling / heating element based on a Peltier effect is arranged on an ink reservoir member. 2. The ink fountain for a printing press according to claim 1, wherein the electronic cooling and heating elements are arranged in a dense and dense manner in accordance with the temperature distribution of the ink stored in the ink reservoir caused by the difference in partial heat dissipation or heat absorption. Cooling / heating equipment. 3. An ink fountain for a printing press according to claim 1, wherein the electronic cooling / heating element is divided into a plurality of groups in the longitudinal direction of the ink fountain substrate, and the electric current is controlled for each group. Heating device. 4. A heat exchanging system using a fluid as a medium for radiating heat from an electronic cooling device.
Ink fountain cooling / heating device of the described printing machine. 5. An ink fountain cooling / heating device of a printing machine, wherein an electronic cooling / heating element is arranged on the back surface of a doctor blade provided on the ink fountain substrate. 6. The ink fountain cooling / heating device for a printing press according to claim 5, wherein a cooling / heating plate is provided on the back side of the doctor blade, and an electronic cooling / heating element is attached in close contact with the cooling / heating plate. 7. An ink fountain for a printing press, comprising: an electronic cooling / heating element arranged in plural on the ink reservoir member; a sensor for detecting an ink temperature; and a means for controlling a current of the electronic cooling / heating element by the sensor output. / Heating device. 8. An electronic cooling / heating element arranged on the back surface of the doctor blade directly or via a cooling / heating plate, a sensor for dividing the electronic cooling / heating element into a plurality of groups, and detecting ink temperature at a plurality of points, and each of the sensors. An ink fountain cooling / heating device of a printing machine, which is provided with a means for controlling a current of an electronic cooling / heating element of each group by output. 9. The ink for a printing press according to claim 7, wherein the current control means controls the magnitude and direction of the current supplied to the electronic cooling / heating element, and a cooling heat source or a heating heat source is configured. Vase cooling / heating device. 10. A duct section formed by an ink fountain substrate and a back surface of a doctor blade, and provided in the duct section,
An ink fountain cooling / heating apparatus for a printing press according to claim 5, further comprising: a blowing unit that blows cold air or hot air toward the heat radiation side of the electronic cooling / heating element. 11. The ink fountain cooling / heating device of a printing press according to claim 10, wherein the cold air or the hot air is normal room air. 12. The ink fountain cooling / heating device according to claim 4, wherein the heat exchange system is composed of a water-cooled heat exchanger for cooling the electronic cooling element.