JPH08290550A - Temperature control device of printer - Google Patents

Abstract

PURPOSE: To prevent a printing trouble from occurring by providing a temperature adjustment means which maintains the temperature of each roller at an appropriate level by adjusting the temperature of a fountain roller and fluctuating rollers. CONSTITUTION: A best suited temperature signal which is set in accordance with an ink viscosity is sent from a calculation control means 11 to a temperature adjustment means 12, which is activated to maintain a fountain roller 8 at an appropriate temperature level, and at the same time, a temperature detection signal from an ambient temperature detection means 10 is sent to the calculation control means 11. The calculation control means 11, based on the temperature detection signal, calculates a best suited temperature for fluctuating rollers 4, 5, 6, 7, and sends a control signal obtained to the temperature adjustment means 12. Thus the temperature adjustment means 12 is operated to maintain the fluctuating rollers 4, 5, 7 at an appropriate temperature. On the other hand, the ambient temperature detection means 10 detects an ambient temperature to send it to the calculation control means 11. If a temperature variation exceeds a specified range, the calculation control means 11 recalculates an appropriate temperature of the fluctuating rollers again, then corrects the control signal to the temperature adjustment means 12, and maintains the fluctuating rollers at an appropriate temperature level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device applied to an ink / dampening device of an offset printing machine.

[0002]

2. Description of the Related Art A conventional cooling device for an ink / fountain solution device will be described with reference to FIG. 5. 1 is an ink roller group for supplying ink, 2 is a dampening device for supplying dampening water, and 3 is a plate cylinder. is there. 4, 5, 6, and 7 in the ink roller group 1 are rocking rollers. Further, 8 is an ink source roller, and 9 is an ink fountain.

When printing is started, ink is transferred from the ink fountain 9 and the ink source roller 8 to the ink roller group 1 to the plate cylinder 3
Will be transferred to. On the other hand, the dampening water is supplied from the dampening device 2 to the non-pattern portion on the plate cylinder 3 via the roller group of the dampening device 2. Meanwhile, the dampening water is transferred from the roller group of the plate cylinder 3 or the dampening device 2 to the ink roller group 1, and is mixed with the ink which is transferred from the ink roller group 1 toward the plate cylinder 3 as described above. The ink is emulsified, and this emulsified ink
An image is formed by transferring to the pattern portion on the upper plate.

When the printing machine is continuously operated, the driving portion, the bearing portion, the rollers and the like generate heat due to friction, and the temperature of each roller of the ink / fountain solution device rises. In order to prevent the rise of the roller temperature, the rocking rollers 4, 5, 7 are configured so that water can pass through the inside of the rollers, and the cooling water from the cooling device 14 is passed through the rocking rollers 4, 5, 7. I'm trying to cool.

[0005]

The swing roller 4,
The cooling devices 14 of 5 and 7 are mainly intended to suppress an abnormal temperature rise of the ink roller group 1, and the plate cylinder 3
It does not consider positively controlling the temperature balance between the ink and the dampening water that transfer toward the ink. As a result,
When ink with unstable temperature characteristics is used, the emulsified state deteriorates (for example, the emulsification rate becomes too high), ink mucus becomes too low, and other phenomena occur, resulting in roller marks, ghosts, density fluctuations, etc. There was a problem of frequent printing failures.

The present invention has been proposed in view of the above problems, and an object of the present invention is to provide a temperature control device for a printing press capable of preventing printing trouble.

[0007]

In order to achieve the above object, a temperature control device for a printing machine according to the present invention controls an ink source roller and a swing roller whose roller temperature is adjustable, and an environmental temperature near the roller. Environmental temperature detecting means for detecting, an arithmetic control means for setting the temperature of the ink source roller to an appropriate temperature, and an arithmetic control means for computing the appropriate temperature of the rocking roller based on a temperature detection signal from the environmental temperature detecting means, and the same arithmetic control. Temperature controlling means for controlling the temperature of the ink source roller and the rocking roller by a control signal from the means to maintain the temperature of each roller at an appropriate temperature.

[0008]

The temperature control device of the printing press of the present invention is constructed as described above, and at the start of printing, the arithmetic control means sets the temperature of the ink source roller to an appropriate temperature corresponding to the ink viscosity, for example, 25 to 30 ° C. Set within the range, send the set appropriate temperature signal from the arithmetic control means to the temperature adjusting means, operate this to keep the ink source roller at the appropriate temperature, and at the same time calculate the temperature detection signal from the environmental temperature detecting means. The calculation control means calculates the appropriate temperature of the rocking roller based on the temperature detection signal, sends the control signal obtained as a result to the temperature adjusting means, and operates it to rock the rocking roller. Keep the rollers at the proper temperature. The environmental temperature detecting means constantly detects the environmental temperature and sends the temperature detection signal obtained as a result to the arithmetic control means, and when the temperature change exceeds a certain range, the arithmetic control means obtains the temperature at this time. The proper temperature of the rocking roller is calculated again by the temperature detection signal, and the control signal to the temperature adjusting means is corrected to keep the rocking roller at the proper temperature.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A temperature control device for a printing press according to the present invention will now be described with reference to an embodiment shown in FIGS. FIG. 1 is a system diagram of a temperature control device of a printing machine, FIG. 2 is an explanatory diagram showing a relationship between a rocking roller temperature and an ink emulsification rate, and FIG. 3 shows a relationship between a rocking roller temperature and an ink viscosity. FIG. 4 is a system diagram showing a temperature adjusting unit of the temperature adjusting means.

In FIG. 1, 1 is an ink roller group for supplying ink, 2 is a dampening device for supplying dampening water, and 3 is a plate cylinder.
1'in the ink roller group 1 is an inking roller, 4,
Reference numerals 5, 6, and 7 are rocking rollers, and 8'is a calling roller.
Further, 8 is an ink source roller, and 9 is an ink fountain. The ink source roller 8 and the swing rollers 4, 5, and 7 are configured to be able to pass water inside the rollers.

The ink is transferred from the ink fountain 9 and the ink source roller 8 to the ink roller group 1 toward the plate cylinder 3. On the other hand, the dampening water is supplied from the dampening device 2 to the non-pattern portion on the plate cylinder 3 via the roller group of the dampening device 2. in the meantime,
The dampening water is transferred from the roller group of the plate cylinder 3 or the dampening device 2 to the ink roller group 1, and is mixed with the ink which is transferred from the ink roller group 1 toward the plate cylinder 3 as described above to form an ink. This is emulsified, and this emulsified ink is transferred to the pattern portion of the plate surface on the plate cylinder 3 to form an image.

Reference numeral 10 is an environmental temperature detecting means (environmental temperature detector) for detecting the environmental temperature near the roller, 11 is an arithmetic control means (arithmetic controller), and 12 is an ink which is constructed so that water can pass through the inside of the roller. Original roller 8 and swing rollers 4, 5,
7 is a temperature adjusting means (temperature adjusting device) connected to 7. The temperature adjusting unit of the temperature adjusting means (temperature adjusting device) 12 will be described with reference to FIG.
4 is a cold water unit, 15 is a mixing tank, 16 is a heater for the mixing tank 15, 17 is a temperature controller, 18 is a temperature detector, and 19 and 20 are flow rate adjusting valves.

In the temperature adjusting unit of the temperature adjusting means (temperature adjusting device) 12, the fluid in the cold water unit 14 is mixed in the tank 15 → the fluid circulating pump 13 → the ink source roller 8
(And rocking rollers 4, 5, 7)-> heater 16-> mixing tank 15-> circulation in the fluid circulation system of fluid circulation pump 13. At that time, the fluid temperature is adjusted to a constant temperature (set temperature) by repeatedly turning ON / OFF the heater 16 or opening / closing the flow rate adjusting valves 19 and 20.

The temperature adjusting unit of the temperature adjusting means (temperature adjusting device) 12 is provided on each of the ink source roller 8 and the oscillating rollers 4, 5, and 7. Next, the printing shown in FIGS. The operation of the temperature control device of the machine will be specifically described. At the start of printing, the temperature of the ink source roller 8 is set in the arithmetic control means 11 within an appropriate temperature range of 25 to 30 ° C. according to the viscosity of the ink, and the set appropriate temperature signal is adjusted by the arithmetic control means 11. The heater 16 or the flow rate control valves 19 and 20 of the temperature control unit for the ink source roller 8 (see FIG. 4) of the means 12 is sent to operate and circulates the fluid having a constant temperature in the fluid circulation system of the ink source roller 8. Then, the ink source roller 8 is maintained at an appropriate temperature.

At the same time, a temperature detection signal from the environmental temperature detecting means 10 is sent to the arithmetic control means 11, and the arithmetic control means 11 is operated.
Then, based on this temperature detection signal, the swing rollers 4, 5,
7 is calculated, and the control signal obtained as a result is used as a heater 16 of the temperature adjusting unit (see FIG. 4) for the rocking rollers 4, 5, 7 of the temperature adjusting means 12 or the flow rate adjusting valve 1.
It is sent to 9, 20 and operated, and a fluid having a constant temperature is circulated in the fluid circulation system of the rocking rollers 4, 5, 7 to keep the rocking rollers 4, 5, 7 at an appropriate temperature.

The ambient temperature detecting means 10 constantly detects the ambient temperature and sends the temperature detection signal obtained as a result to the arithmetic control means 11, and when the temperature change exceeds a certain range, the arithmetic control means. In 11, the proper temperature of the rocking rollers 4, 5, 7 is calculated again based on the temperature detection signal at this time, and the control signal to the temperature adjusting unit for the rocking rollers 4, 5, 7 of the temperature adjusting means 12 is sent. Correct and maintain the proper temperature.

There is a close relationship between the temperature of the rocking rollers 4, 5, 7 and the ink emulsification rate and ink viscosity. Figure 2
Shows the relationship between the temperature of the rocking rollers 4, 5, and 7 and the ink emulsification rate. The appropriate emulsification rate for printing is, for example, 5% to 15% in the case of the oscillating rollers 4 and 5, so the roller temperature is set to 2
It is preferable to control in the range of 5 to 35 ° C.

FIG. 3 shows the relationship between the temperature of the rocking rollers 4, 5, 7 and the ink viscosity. Since the ink viscosity in the ink roller group 1 is 100 poise or less, it is preferable to control the roller temperature in the range of 25 to 35 ° C. Therefore, the temperature of the oscillating rollers 4, 5, and 7 is controlled in the range of 25 to 35 ° C. while considering the changes in the ink emulsification rate and the ink viscosity.

[0019]

As described above, in the temperature control device of the printing machine of the present invention, when the printing is started, the arithmetic control means is caused to set the temperature of the ink source roller to an appropriate temperature corresponding to the ink viscosity, for example, 25-3
The temperature is set within the range of 0 ° C., and the set appropriate temperature signal is sent from the arithmetic and control unit to the temperature adjusting unit, which is operated to keep the ink source roller at the appropriate temperature and at the same time the temperature from the environmental temperature detecting unit is set. The detection signal is sent to the calculation control means, which calculates the appropriate temperature of the rocking roller based on this temperature detection signal, and sends the control signal obtained as a result to the temperature adjustment means to operate it. The swing roller is maintained at an appropriate temperature. The environmental temperature detecting means always detects the environmental temperature and sends the temperature detection signal obtained as a result to the arithmetic control means. When the temperature change exceeds a certain range, the arithmetic control means obtains the temperature at this time. The appropriate temperature of the rocking roller is recalculated based on the temperature detection signal, and the control signal to the temperature adjusting means is corrected to keep the rocking roller at the proper temperature, so that the emulsified state deteriorates (for example, the emulsification rate is It does not occur that the ink viscosity becomes too low or the ink viscosity is too low, and printing problems such as roller stitches, ghosts, and density fluctuations can be prevented.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a temperature control device for a printing press according to the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a rocking roller temperature and an ink emulsification rate.

FIG. 3 is an explanatory diagram showing a relationship between rocking roller temperature and ink viscosity.

FIG. 4 is a system diagram showing a temperature adjusting unit of the temperature adjusting means.

FIG. 5 is a system diagram showing a cooling device of a conventional ink / fountain solution device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink roller group 1'Ink application roller 2 Damper device 3 Plate cylinder 4 Swing roller (swing roller with adjustable temperature) 5 Swing roller (swing roller with adjustable temperature) 6 Swing roller 7 Swing roller (Rotating roller capable of adjusting temperature) 8 Ink source roller 8'Calling roller 9 Ink fountain 10 Environmental temperature detecting means (environmental temperature detector) 11 Arithmetic control means (arithmetic controller) 12 Temperature regulating means (temperature regulating device)

Claims (1)

[Claims] 1. An ink source roller and an oscillating roller whose roller temperature is adjustable, an environmental temperature detecting means for detecting an environmental temperature in the vicinity of the roller, and a temperature of the ink source roller is set to an appropriate temperature and the environmental temperature is set. A calculation control means for calculating an appropriate temperature of the rocking roller based on a temperature detection signal from a detecting means, and a control signal from the calculation control means for adjusting the temperatures of the ink source roller and the rocking roller. A temperature control device for a printing press, comprising: a temperature adjusting means for maintaining the temperature of the roller at an appropriate temperature.