JPH0453947Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an ink agitator that makes it possible to control the temperature of ink in an ink fountain in a printing press.

PRIOR ART AND PROBLEMS The inking device in a printing press is configured to transfer ink supplied to an ink fountain to a plate cylinder via a number of rollers.

By the way, the temperature of the ink in the inking device is about 26 to 30°C on the roller during operation of the printing press, and about 32 to 35°C in the ink fountain. During operation, it is stabilized within approximately the above range due to the influence of heat from various parts of the machine.

However, when the printing press starts operating, when the machine resumes operation after stopping, or when ink is added to the ink fountain due to ink shortage, the ink temperature in each part varies and the temperature remains constant during operation. Until now, there have been cases where printed matter has become defective.

Moreover, the same problem also occurs depending on the type of ink. In other words, depending on the season, the ink temperature may not reach the desired temperature. Conventionally, such cases have been dealt with by changing the type of ink.

In consideration of the above-mentioned problems, the present invention has been developed to prevent
The purpose is to keep the ink temperature at the normal operating temperature and prevent the occurrence of defective printed matter.

<Means and operations for solving the problems> In order to achieve the above object, the present invention configures an ink agitator by incorporating a heater into an agitator head that reciprocates in an ink fountain, and By controlling the heater, for example, controlling its activation and deactivation, the ink temperature in the ink fountain is kept within a predetermined range.

<Example> Fig. 1 shows a schematic side view of an ink agitator according to an embodiment of the present invention installed in an ink fountain, Fig. 2 shows a cross section of the ink agitator, and Fig. 3 shows a cross section of the ink agitator. 1 shows the schematic perspective appearance of FIG. 1, and FIGS. 4 and 5 show the control system.

1 is an ink fountain, and on the outlet side there is a fountain roller 2.
is provided, and as the fountain roller 2 rotates, the ink 3 in the ink fountain 1 is applied onto a transfer roller (not shown).

The ink agitator 4 provided in the ink fountain 1 has a cone-shaped agitator head 5, a shaft 6 connected to the agitator head 5, and a carriage 7 for holding the shaft 6. The carriage 7 of the ink agitator 4 is the ink fountain 1.
It is installed on a rail 8 laid laterally (in a direction parallel to the width direction of the ink fountain 1) at the rear of the ink fountain 1, and is connected to a chain 9. Therefore,
The agitator head 5 is reciprocated between both ends of the ink fountain 1 by the reciprocating motion of the carriage 7 by the reciprocating drive of the chain 9. The reciprocating movement of the agitator head 5 smoothes the ink 3 in the ink fountain 1, making the fluidity and density uniform.

A heater 10 is incorporated into the agitator head 5 of the ink agitator 4, as shown in FIG.
The heater cable 11 passes through the shaft 6 and the carriage 7 and is connected to a power receiving section 12 such as a brush on the back of the carriage 7. At the rear of the ink fountain 1, a conductive rail (power supply cable) 13 is provided parallel to the chain 9, and the power receiving section 12 is slidably contacted thereto. Therefore, power can always be supplied to the heater 10 even when the ink agitator 4 moves back and forth.

On the other hand, a temperature sensor 14 is provided in the ink fountain 1 to detect the temperature of the ink 3, and the operation of the heater 10 in the ink agitator 4 is controlled according to the ink temperature detected by the temperature sensor 14. An example of the control system is shown in FIGS. 4 and 5. In this example, the control method is a two-position control method, that is, when the temperature of the ink 3 falls to a certain temperature, power is supplied and the heater 10 is activated. However, a system is adopted in which the power supply is stopped when the temperature of the ink 3 rises to a certain temperature. In FIGS. 4 and 5, 15 is a temperature detector, and 16 is a heater control device. Further, in FIG. 1, 17 is an arm that supports the temperature sensor 14.

In the temperature control device having the above configuration including the ink agitator 4 according to the present invention, when the printing press starts or restarts, or when the ink fountain 1 is filled with ink 3
If the temperature of the ink 3 is lower than the lower limit of the predetermined range (for example, 32°C to 35°C),
This is detected by the temperature sensor 14 and the detector 15, and the control device 16 starts supplying power to the heater 10.

By being stirred from the inside by the ink agitator 4 heated by the heater 10,
The temperature of the ink 3 in the ink fountain 1 is raised to the optimum temperature from the time when printing is started.

As time passes, the temperature of the ink 3 increases due to the influence of heat from the surroundings, and when the temperature rises to the upper limit of a predetermined range, control is performed according to the temperature detected by the temperature sensor 14 and detector 15. The power supply to the heater 10 is stopped by the device 16, and the temperature of the ink 3 is prevented from becoming higher than necessary.

As described above, by controlling the power supply to the heater 10 on and off based on the two-position temperature of the ink 3, the temperature of the ink 3 is controlled so as to fall within a desired range.

Furthermore, even if the ambient temperature varies depending on the season, the ink temperature is similarly controlled.

Furthermore, by adopting a method of controlling the ink temperature by passing cooling water through the shaking roller in conjunction with the temperature control device described above, a more excellent ink temperature control system can be realized.

In the above embodiment, a brush is used as the power supply method to the heater 10 in the ink agitator 4, but other methods such as a trolley method can of course be used.

<Effects of the invention> According to the ink agitator according to the invention, it becomes possible to control the ink temperature in the ink fountain, and it becomes possible to obtain printed matter of higher quality than when starting printing. Since the ink temperature can be controlled separately from the surrounding temperature, there is no need to use different types of ink depending on the season. Furthermore, since the temperature of the ink is directly controlled by the heater built into the ink agitator, there is little thermal influence on various parts of the machine.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of an installed state of an ink agitator according to an embodiment of the present invention, Fig. 2 is a sectional view of the ink agitator, Fig. 3 is a schematic perspective external view of Fig. 1, and Fig. 4 is a temperature A schematic diagram of the management device, FIG. 5 is a block diagram of the temperature management system. In the drawing, 1 is an ink fountain, 2 is a fountain roller, 3
is the ink, 4 is the ink agitator, 5 is the agitator head, 7 is the carriage, 10 is the heater, 11
is a heater cable, 12 is a power receiving section, 13 is a conductive rail (power supply cable), 14 is a temperature sensor, 16
is a heater control device.

Claims (1)

[Scope of utility model registration request] An ink agitator characterized in that a heater is incorporated in an agitator head that moves back and forth within an ink fountain to stir ink.