JP3008637U - Waterless lithographic printing press temperature controller - Google Patents

Abstract

(57) [Summary] [Purpose] A temperature control device for a waterless planographic printing press that facilitates the conversion of an existing waterless planographic printing press to a waterless planographic printing press. [Configuration] When a target temperature is input via the setting key 36 of the controller 34, the controller 34 stores the target temperature. The controller 34 holds the target temperature and the surface temperature within a range of, for example, ± 1 ° C. according to the difference between the set target temperature and the surface temperature calculated based on the signals of the infrared temperature sensors 28a and 28b. Therefore, the air temperature and the air volume of the air conditioner 40 are controlled. Cooling air from the outside is applied to the inking roller 16a and plate cylinder 18
The temperature of the plate surface of the plate cylinder 18 and the temperature of the ink can be maintained in an appropriate range by spraying onto the plate, and it is not necessary to use a conventional cooling roller. Therefore,
The existing lithographic printing press with water can be easily converted to a lithographic printing press without water.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a temperature control device for a waterless planographic printing machine for controlling the plate surface temperature of the waterless planographic printing machine.

[0002]

[Prior art]

 As is well known, lithographic printing machines include water-containing lithographic printing machines that apply dampening water to plate cylinders and waterless lithographic printing machines that do not use dampening water. In addition, since the waterless planographic printing machine does not use dampening water, it has advantages such as less paper shrinkage and higher printing accuracy.

It is known that, in a lithographic printing machine, scumming occurs when the temperature of the inking roller or the plate cylinder rises due to friction with other rollers or cylinders and the viscosity of the ink decreases. Since the planographic printing machine with water has a cooling effect due to the evaporation of dampening water, the temperature rise of the plate cylinder, etc. was avoided without any special cooling operation, and the occurrence of scumming was also prevented.

However, in a waterless planographic printing machine that does not use fountain solution, since the cooling effect due to the evaporation heat as described above does not exist, a means for cooling the plate cylinder is indispensable. As illustrated in FIG. 2, a cooling device is provided in which a cooling roller 104 that contacts the inking roller 102 is provided, and cold water from a chiller is passed through the cooling roller 104 to hold the ink and the plate cylinder 106 at appropriate temperatures. Was there.

[0005]

[Problems to be solved by the device]

 Since the waterless lithographic printing press required a cooling device using such cooling rollers, it was extremely difficult to convert the existing lithographic printing press with water to no water. It was not possible to switch from having water to no water other than disposing of the planographic printing machine and purchasing a new waterless planographic printing machine.

The temperature control device of the present invention facilitates conversion of a lithographic printing machine with water to a lithographic printing machine without water by adopting a configuration that does not use a cooling roller.

[0007]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems, a temperature control device for a waterless planographic printing machine according to claim 1 is provided with a cooling mechanism for spraying cooling air toward the inking roller and the plate cylinder of the waterless planographic printing machine. A non-contact type thermometer that detects the surface temperature of both or one of the inking roller and the ink roller in contact with the inking roller, and the temperature that sets the target surface temperature of the inking roller or plate cylinder according to the input Setting means, temperature difference calculating means for calculating the temperature difference between the detected temperature and the target surface temperature, and control means for controlling the operation of the cooling mechanism according to the temperature difference. .

According to a second aspect of the present invention, there is provided a temperature adjusting device for a waterless planographic printing press according to the first aspect, wherein the cooling device has an air conditioner as the cooling mechanism.

[0009]

[Action]

 In the temperature controller for a waterless planographic printing machine according to the first aspect of the present invention, the temperature setting means sets the target surface temperature of the inking roller or the plate cylinder according to the input. The non-contact type thermometer detects the surface temperature of both or one of the inking roller and the ink roller in contact with the inking roller. The temperature difference calculation means calculates a temperature difference between the detected temperature and the target surface temperature. The control means controls the operation of the cooling mechanism according to the temperature difference. The cooling mechanism blows cooling air toward the inking roller and the plate cylinder. By the cooling air, the inking roller and the plate cylinder are cooled to the target surface temperature, and the ink is brought to an appropriate temperature.

Since the inking roller and the plate cylinder are cooled by blowing cooling air, they can be easily installed in an existing lithographic printing machine with water. Therefore, the lithographic printing press with water can be converted to the lithographic printing press without water very easily. In the temperature adjusting device of the waterless planographic printing machine according to the second aspect, an air conditioner is provided as a cooling mechanism. Since the air conditioner can discharge hot air, if the plate temperature is too low at the start of operation of the lithographic printing machine during low temperatures such as winter, warm the plate to an appropriate plate temperature. You can also

[0011]

【Example】

 Next, an embodiment of the present invention will be described. FIG. 1 shows an outline of a waterless planographic printing machine 10 of this embodiment. The structure and operation of the main parts of the waterless lithographic printing machine 10 are the same as those of the conventional ones. After kneading with the roller 14, it is adhered to the plate cylinder 18 through the inking rollers 16a, 16b, 16c and 16d to form a normal image. This normal image is transferred to the blanket cylinder 20 to form a reverse image, and is further printed by the paper feed roller 22 on the paper 26 inserted between the blanket cylinder 20 and the press cylinder 24 as a normal image.

The waterless lithographic printing machine 10 includes two infrared temperature sensors 28a and 28b. The infrared temperature sensor 28a is directed to the inking roller 16d arranged on the most downstream side along the rotation direction (arrow A) of the plate cylinder 18 among the four inking rollers 16a to 16d. A roller temperature signal corresponding to the surface temperature of the meat roller 16d is output to the monitor 30. Similarly, the infrared temperature sensor 28b is directed toward the surface of the plate cylinder 18 on the downstream side of the inking roller 16d, and outputs a cylinder temperature signal corresponding to the surface temperature of the plate cylinder 18 to the monitor 30.

The monitor 30 is provided with two liquid crystal panels 32a and 32b, each of which can display a numeral from tenth place to one decimal place. The roller temperature signal and the cylinder temperature signal input from the infrared temperature sensors 28a and 28b to the monitor 30 are input to the controller 34.

The controller 34 has a built-in microcomputer (not shown) having a well-known CPU, ROM, RAM, etc., and is provided with a setting key 36 including numeric keys, a main switch 38, and a sub switch 39. The setting key 36 is for inputting an operator's instruction to the controller 34, and the target temperature input via the setting key 36 can be displayed on the liquid crystal panel 32b. It should be noted that this target temperature, when input via the setting key 36, is instructed to be either the inking roller 16d or the plate cylinder 18 or the average surface temperature of both. Moreover, the controller 34 can calculate the surface temperature of the inking roller 16d, the surface temperature of the plate cylinder 18 and the average temperature of both based on the roller temperature signals and the cylinder temperature signals from the infrared temperature sensors 28a and 28b. Then, either of these can be displayed on the liquid crystal panel 32a in correspondence with the above-mentioned target temperature.

The main switch 38 is a power switch of the controller 34, and when it is turned on, the controller 34, the monitor 30, and the infrared temperature sensors 28a and 28b start operating. A well-known air conditioner 40 is connected to the controller 34, and the temperature and air volume of the air discharged by the air conditioner 40 can be controlled by a command signal from the controller 34. The sub switch 39 of the controller 34 is a switch for cutting off the electric power to the air conditioner 40. If the sub switch 39 is off, the air conditioner 40 does not operate.

A flexible hose 42 is attached to the discharge port of the air conditioner 40, and a swing nozzle 44 capable of swinging up and down is attached to the tip of the flexible hose 42. The rocking nozzle 44 is electrically connected to the air conditioner 40 through a path (not shown), and when the air conditioner 40 operates, the rocking nozzle 44 also swings. The tip of the flexible hose 42 is fixed at a position where the surface of the plate cylinder 18 on the upstream side of the inking roller 16a and the inking roller 16a is adjusted so as to be included in the swing range of the swing nozzle 44. ing. Therefore, when the air conditioner 40 is operated, the swing nozzle 44 swings, and the air discharged from the air conditioner 40 is blown to the surfaces of the inking roller 16a and the plate cylinder 18.

Next, the operation of the waterless lithographic printing press 10 having such a configuration will be described. The printing operation itself is the same as the conventional one as described above, and therefore the description thereof is omitted. First, the operator turns on the main switch 38 and then inputs the target temperature via the setting key 36 of the controller 34 along with an instruction of either the inking roller 16d or the plate cylinder 18 or the average surface temperature of both. Then, the controller 34 stores the target temperature and displays it on the liquid crystal panel 32b. Further, since the monitor 30 and the infrared temperature sensors 28a and 28b are operating when the main switch 38 is turned on, the controller 34 causes the liquid crystal panel 32a to display the surface temperature corresponding to the instructed target temperature. The display of the liquid crystal panel 32a is updated based on the signals from the infrared temperature sensors 28a and 28b every time a predetermined time elapses.

When the setting operation is completed and the sub switch 39 is turned on, the air conditioner 40 starts operating according to a command from the controller 34. The controller 34 sets the target temperature and the surface temperature within a range of, for example, ± 1 ° C. according to the difference between the set target temperature and the surface temperature calculated based on the signals of the infrared temperature sensors 28a and 28b. The air temperature and the air volume of the air conditioner 40 are controlled so as to maintain the temperature.

As described above, in the waterless lithographic printing machine 10, by blowing the cooling air from the outside onto the inking roller 16 a and the plate cylinder 18, the plate surface temperature and the ink temperature of the plate cylinder 18 are kept within an appropriate range. can do. Further, with such a configuration, it is not necessary to use a conventional cooling roller. Therefore, according to the technology of this embodiment, the existing lithographic printing press with water can be easily converted to the lithographic printing press without water.

The present invention has been described above according to the embodiments. However, it goes without saying that the present invention is not limited to such embodiments and can be variously implemented without departing from the gist of the present invention. For example, it is possible to use a cool air blower instead of the air conditioner. However, since the air conditioner can discharge hot air, if the plate temperature is too low at the start of operation of the lithographic printing machine, such as in winter when the temperature is low, warm the plate to an appropriate plate temperature. You can also

[0021]

[Effect of device]

 As described above, since the temperature control device of the waterless planographic printing machine according to claim 1 is configured to blow the cooling air to cool the inking roller and the plate cylinder, the existing water-based planographic printing machine can be easily installed. Can be attached to. Therefore, a lithographic printing machine with water can be converted to a lithographic printing machine without water very easily.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a device configuration of a waterless planographic printing machine according to an embodiment.

FIG. 2 is an explanatory diagram of a main part of a conventional waterless planographic printing machine.

[Explanation of symbols]

10 ... Waterless planographic printing machine, 14 ... Kneading roller,
16a to 16d ... Inking roller, 18 ... Plate cylinder, 20 ... Blanket cylinder, 24 ... Press cylinder, 28a, 28b ... Infrared temperature sensor (non-contact type thermometer), 30. ..Monitors, 32a, 32
b ... Liquid crystal panel, 34 ... Controller (temperature setting means, temperature difference calculating means, control means), 40 ... Air conditioner (cooling mechanism), 42 ... Flexible hose (cooling mechanism), 44 ... Swing nozzle (cooling mechanism).

Claims (2)

[Scope of utility model registration request] 1. A surface temperature of at least one of a cooling mechanism for blowing cooling air toward a replenishing roller and a plate cylinder of a waterless planographic printing machine, and a surface temperature of both or one of the replenishing roller and an ink roller in contact with the replenishing roller. A non-contact type thermometer, a temperature setting means for setting a target surface temperature of the inking roller or the plate cylinder according to an input, and a temperature difference calculating means for calculating a temperature difference between the detected temperature and the target surface temperature. And a control means for controlling the operation of the cooling mechanism according to the temperature difference, a temperature adjusting device for a waterless lithographic printing press. 2. The temperature adjusting device for a waterless lithographic printing press according to claim 1, wherein an air conditioner is provided as the cooling mechanism.