JP3129158B2 - Waterless offset printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterless offset printing machine for performing lithographic offset printing, and more particularly to a waterless offset printing machine characterized by an inking unit for supplying ink from an ink fountain to a plate cylinder. Has to do with.

[0002]

2. Description of the Related Art The ink used in an offset printing press is a viscoelastic substance, and the viscosity of the ink decreases when stirred, and the fluidity improves. When the ink is kept stationary, the viscosity increases and the fluidity deteriorates. It has the property of.

[0003] The fluidity of the ink has a great influence on the quality of the printed matter printed by the offset printing machine. That is, if the fluidity of the ink is low, the density of the image portion of the printed matter printed by the offset printing machine becomes low.

For this reason, in the offset printing press, the ink is transported while kneading the ink in an inking unit for supplying the ink from the ink fountain to the plate cylinder. The temperature of the ink is also raised by being kneaded by the inking unit.

[0005] The change in the temperature of the ink also affects the fluidity of the ink due to stirring. When the temperature of the ink increases, the fluidity of the ink due to stirring increases. Such a change in the fluidity of the ink has a great influence on the quality of the printed matter printed by the offset printing machine, and the ink transferred from the blanket cylinder of the offset printing machine to the printing medium only by a slight change in the fluidity. , The print density varies, and the quality of the printed matter printed by the offset printing machine cannot be kept constant.

When the fluidity of the ink increases due to a rise in the temperature of the ink in the inking unit, the amount of the ink transferred from the blanket cylinder to the print medium within a predetermined time (ie, the printing speed) has an upper limit. The amount of ink supplied from the ink fountain to the inking unit is larger than the amount of ink transferred from the blanket cylinder to the printing medium, and the image area on the outer peripheral surface of the plate cylinder and blanket cylinder and the ink in the inking unit Ink accumulates on the outer peripheral surface of the other rollers. If the amount of ink accumulated in the image area on the outer peripheral surface of the plate cylinder or blanket cylinder exceeds the amount of ink that the image area can hold, excess ink is removed from the image area on the outer peripheral surface to the non-image area. To the non-image area. The ink adhering to the non-image area on the outer peripheral surface of the plate cylinder or the blanket cylinder is transferred to the print medium and causes stain on the print medium.

In the case of offset printing using a dampening solution, the temperature of the ink on the plate cylinder or blanket cylinder is relatively stable owing to the cooling effect of the evaporation of the dampening solution. The phenomenon of the occurrence of dirt was suppressed to some extent.

[0008]

Recently, when ink is supplied from the inking unit to the plate cylinder, fountain solution is not used, and the ink is repelled by a film of silicon or the like coated on the non-image portion of the plate, thereby forming an image. So-called waterless offset printing machines, which apply ink only to the line portions, have come to be used.

Since the dampening solution is not used in this waterless offset printing press, the cooling effect of the dampening solution cannot be enjoyed, and the printing cylinder or blanket cylinder cannot be used for long-time printing or high-speed operation. The temperature rises. As a result, the temperature of the ink rises and the viscosity of the ink decreases, so that the fluidity of the ink improves, and the phenomenon that the print medium is stained often occurs as described above. This is mainly due to the fact that the fluidity of the ink has become extremely high, so that it is no longer possible to repel the ink with a coating of silicon or the like that covers the non-image area of the plate.

[0010] By using an air-cooled or water-cooled cooling device to suppress an increase in the temperature of the plate cylinder, the ink flows so that a film of silicon or the like coated on the non-image portion of the plate cannot repel the ink. To prevent this from increasing, but using such a cooling device alone
As described above, the phenomenon that the print medium is stained cannot be prevented.

This is because the change in the fluidity of the ink is rapid at the time of temperature rise and is slow at the time of the temperature decrease.
Since the ink temperature is higher than a predetermined value in the inking unit between the ink fountain and the plate cylinder and the fluidity of the ink is higher than the predetermined value, This is because, even if the rise in the temperature of the cylinder is suppressed as described above and the temperature of the ink falls below a predetermined value, the fluidity of the ink in the plate cylinder does not fall below a predetermined value. Therefore, when using the waterless offset press for a long time or when operating at high speeds, clean the blanket cylinder and plate cylinder frequently, and stop the operation of the waterless offset press every time. Therefore, there has been a problem that the printing efficiency is reduced.

In a conventional offset printing press using a dampening solution, the temperature of the ink temporarily rises above a predetermined value in the inking unit before reaching the blanket cylinder, and the fluidity of the ink becomes lower than the predetermined value. If it rises, the fluidity of the ink cannot be reduced below a predetermined value only by the cooling effect of the dampening solution, and the printing medium will be stained as described above. Also in this case, the operation of the conventional offset printing press that uses dampening water to clean the blanket cylinder and the plate cylinder has to be stopped, so that there has been a problem that the printing efficiency is reduced.

[0013] The present invention is made under the above circumstances, the object is often operated in order to perform frequent cleaning of the blanket cylinder and plate cylinder in the case of high speed operation and when used over a long period of the present invention without stopping it can be prevented excessive ink buildup that the blanket cylinder and the plate cylinder, to provide a waterless off <br/> set printing machine which can prevent the contamination occurs in the print medium by excess ink There is .

[0014]

To SUMMARY OF THE INVENTION To achieve the above object of the present invention, waterless offset printing machine according to the invention: also the inking unit for supplying ink from the ink fountain to the plate cylinder an ink fountain Cooling means for cooling the internal space including the cover; temperature measuring means for measuring a temperature in at least one portion of the internal space; cooling control means for controlling the operation of the cooling means based on the temperature measured by the temperature measuring means And;

[0015] [Operation] In the above as characterized in that it is constituted waterless offset printing press in accordance with the present invention, the inking unit for supplying ink from the ink fountain to the plate cylinder in
The cooling means including the kiln is covered by the cooling means, and the cooling means cools the internal space. The temperature measuring means measures the temperature in at least one portion of the internal space, and the cooling control means controls the operation of the cooling means based on the temperature measured by the temperature measuring means.

The cooling control means can control the operation of the cooling means so that the temperature of the internal space of the cooling means covering the inking unit is set to a predetermined temperature, so that the temperature of the inking unit can be set to a predetermined temperature. The temperature of the ink in the inking unit when using for a long period of time or operating at high speeds, even with offset printing machines without water or offset printing using dampening water,
That is, the viscosity of the ink is maintained at a predetermined value. Therefore, once an appropriate ink supply amount from the ink fountain to the inking unit is set, no excess ink is accumulated in the blanket cylinder, the plate cylinder, and the like, and no stain is generated on the print medium. Further, printing can be performed with a more stable print density.

In the offset printing press according to the present invention, a plurality of inks are supplied from the ink fountain to the plate cylinder in contact with each other while rotating in the inking unit. It is preferable that the temperature measuring means measures the temperature of at least one of the plurality of rollers whose temperature is relatively easy to rise.

This is because, as described above, the change in the fluidity of the ink, that is, the change in the viscosity due to the change in the degree of stirring and the temperature, is rapid when the temperature rises and slow when the temperature falls, and the fluidity of the ink that has increased before the increase increases. It takes a minimum of 2-3 days to return to the degree of gender, and therefore the temperature is raised on the relatively hot rollers among the plurality of rollers in the inking unit to increase the fluidity. This is because even if the temperature of the ink is lowered before reaching the blanket cylinder, its fluidity does not decrease.

For this purpose, the temperature measuring means measures the temperature of at least one of the rollers whose temperature is relatively easy to rise, and controls the operation of the cooling means based on the temperature of the ink on the at least one of the rollers. By controlling the cooling control means, the temperature of the ink in the inking unit, that is, the viscosity and the fluidity, can be more stably maintained at the predetermined values.

In the offset printing press according to the present invention, all the temperatures of the plurality of rollers in the inking unit, of which the temperature is relatively easy to rise, are measured by the temperature measuring means. It is of course possible to control the operation of the cooling means by the cooling control means on the basis of this.

Among the plurality of rollers in the inking unit, the roller whose temperature tends to rise relatively easily is at least one of an ink source roller, an ink feeding roller, and an ink transfer roller.

The ink feeding roller oscillates between the ink source roller and the ink delivery roller so as to contact them alternately, and moves ink from the ink source roller to the ink delivery roller. During this time, the impact force generated by the contact between the ink supply roller and the ink supply roller and the ink transfer roller causes the temperature of these rollers to relatively easily rise.

Among the plurality of rollers in the inking unit, the roller whose temperature tends to rise relatively easily is at least one of a vibration roller and a roller that comes into contact with the vibration roller.

The vibration roller reciprocates in a direction along its own rotation center line in contact with the two rollers on both sides in the radial direction to knead ink in cooperation with the two rollers. As a result, frictional heat is generated, and the temperature tends to rise relatively easily. The temperature of the roller in contact with the vibration roller is relatively likely to rise due to friction with the vibration roller and heat conduction from the vibration roller.

Among the plurality of rollers in the inking unit, the roller whose temperature is relatively easy to rise is such that the ink mixing rollers in contact with each other among the plurality of rollers are covered with a material having a high friction coefficient. In this case, there is at least one of the ink mixing rollers that are in contact with each other.

When the material of both surfaces of the ink mixing roller in contact with each other is a material having a low friction coefficient, for example, metal or Teflon, or the material of one surface is a material having a high friction coefficient, for example, rubber, etc. When the material of the other surface is a material having a low friction coefficient, for example, metal or Teflon, a large frictional heat is not generated between the ink mixing rollers which are in contact with each other, but they are in contact with each other. When the material of both surfaces of the ink mixing roller is a material having a high friction coefficient as described above, a large frictional heat is generated between the ink mixing rollers that are in contact with each other, so that the temperature relatively easily rises. .

[0027] In the offset printing press according to the present invention, which is configured as described above, it is preferable that the cooling means sends cooling air to the internal space to cool the internal space. Such a cooling means makes it possible to use an air cooling device conventionally used in a place where an offset printing machine is used.

In the offset printing press according to the present invention having the above-described configuration, it is preferable that the temperature measuring means further measures the temperature of the plate. This is to prevent the temperature of the plate from being excessively cooled below the desired temperature, thereby preventing the ink from getting on the image portion of the plate from being deteriorated.

A plate used in an offset printing press using a dampening solution is a plano-convex plate in which an image portion to which ink adheres is slightly raised compared to a non-image portion, but no dampening solution is used. The printing plate used in the waterless offset printing press is a planographic printing plate in which an image portion to which ink adheres is recessed compared to a non-image portion. In such a planographic printing plate, when the temperature of the plate is excessively cooled below the desired temperature, the ink supplied to the plate cylinder via the inking unit is also cooled as soon as it comes into contact with the plate, resulting in fluidity. And the ink may not be sufficiently filled in the concave image portion. If there is a portion where the ink is not sufficiently filled in the concave image portion, the printing of the portion where the ink is not sufficiently filled in the image transferred from the plate cylinder to the print medium via the blanket cylinder occurs.

Further, the plate cylinder is more affected by the heat applied from the outside than the blanket cylinder in which a blanket having excellent heat insulating properties is wound, so that the temperature measuring means measures the temperature of the plate. This is important for improving print quality. Hereinafter, a main part of an offset printing press according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0031]

FIG. 1 schematically shows one side view of a rotary press used in an offset printing press according to one embodiment of the present invention, wherein the rotary press is used for duplex printing. Wherein the offset printing press is a waterless offset printing press.

The two-sided printing rotary press includes a pair of upper and lower blanket cylinders 12A and 12B for sandwiching both sides of the print medium 10 supplied from a print medium supply means (not shown). The print medium 10 may be in the form of a sheet, or may be in the form of long paper drawn from a web wound in a cylindrical shape. Also print medium 1
The material of 0 may be any material as long as offset printing is possible.

A pair of upper and lower blanket cylinders 12A and 12B
Each has an upper plate roller 14A provided on its surface with a printing plate of an image to be printed on both sides of the print medium 10 via each of them.
And the lower plate roller 14B are in contact with each other.

The upper plate roller 1 is located above the upper plate roller 14A.
An upper ink fountain 16A holding ink for 4A is arranged, and an upper inking for supplying ink from the upper ink fountain 16A to the upper plate roller 14A is provided between the upper plate roller 14A and the upper ink fountain 16A. Unit 18A is interposed. The lower plate roller 14B is provided below the lower plate roller 14B.
A lower ink fountain 16B holding ink for B is arranged, and a lower inking for supplying ink from the lower ink fountain 16B to the lower plate roller 14B is provided between the lower plate roller 14B and the lower ink fountain 16B. Unit 18B is interposed.

The upper inking unit 18A and the lower inking unit 18B are respectively covered by mutually independent covers 17A and 17B. It is preferable that each of the covers 17A and 17B has a heat insulating structure. In this embodiment, the upper plate roller 14A and the upper ink fountain 16A are covered with the cover 17A together with the upper inking unit 18A, and the lower plate roller 14B and the lower ink fountain 16B are covered together with the lower inking unit 18B. 17B. The upper ink fountain 16A and the lower ink fountain 16B are respectively provided with heat-insulated pipes 19A, 19A.
9B supplies a desired type of ink from an external ink supply source (not shown).

The structure of the upper inking unit 18A and the structure of the lower inking unit 18B are substantially vertically symmetrical with respect to the printing medium transport path between the pair of upper and lower blanket cylinders 12A and 12B. Unit 1
Only the structure of 8A will be described, and description of the structure of the lower inking unit 18B will be omitted. In addition, upper inking unit 1
8A are indicated by adding an A to the reference numerals as can be seen from the above description, and the lower inking unit 1
In FIG. 8B, the components corresponding to the components of the upper inking unit 18A are indicated by the same reference numerals with B added.

The upper inking unit 18A includes a plurality of rollers that are in contact with each other and are each rotating, with the rollers including: an ink key from the upper ink fountain 16A while rotating in a predetermined direction at a predetermined speed. An ink source roller 22A to which a desired flow rate of ink is adhered by 20A; and a call roller 24A which intermittently contacts the ink source roller 22A during rotation in a predetermined direction at a predetermined speed and calls ink from the ink source roller 22A. A transfer roller 26A that rotates in a predetermined direction at a predetermined speed and receives ink from the call roller 24A when the call roller 24A intermittently contacts; and rotates in a predetermined direction at a predetermined speed. And reciprocates in the direction along the rotation center line of itself and contacts the transfer roller 26A to cooperate with the transfer roller 26A. First vibration roller (reciprocating roller 1) 28A and to receive ink from the transfer roller 26A while kneading the ink; being rotated in a predetermined direction at a predetermined speed a first vibration roller 28A
And a first kneading roller 30A that receives ink from the first vibration roller 28A while kneading the ink in cooperation with the first vibration roller 28A.
A second kneading roller 32A (in this embodiment, the lower inking unit 18B which rotates in a predetermined direction at a predetermined speed and contacts the first kneading roller 30A to receive ink from the first kneading roller 30A). The second kneading roller is omitted); a copper plating roller 34A that rotates in a predetermined direction at a predetermined speed and comes into contact with the second kneading roller 32A and receives ink from the second kneading roller 32A.
(In this embodiment, the copper plating roller 34B is in contact with the first kneading roller 30B in the lower inking unit 18B in which the second kneading roller is omitted); A third kneading roller 36A for receiving ink from the copper plating roller 34A in contact with the copper plating roller 34A; rotating in a predetermined direction at a predetermined speed and reciprocating in a direction along its own rotation center line. A second vibration roller (reciprocating roller 2) 38A that receives the ink from the third kneading roller 36A while moving and coming into contact with the third kneading roller 36A and cooperating with the third kneading roller 36A to knead the ink; The second vibration roller 3 is rotating at a predetermined speed in a predetermined direction.
8A, while receiving the ink from the second vibration roller 38A while kneading the ink in cooperation with the second vibration roller 38A in contact with the second vibration roller 38A, and contacting the upper plate roller 14A to apply the ink to the upper plate roller 14A. And an ink forming roller 40A.

The plurality of rollers of the upper inking unit 18A further include: a third roller rotating in a predetermined direction at a predetermined speed and reciprocating in a direction along its own rotation center line;
The third kneading roller 36A comes into contact with the kneading roller 36A.
Third kneading roller 36A while kneading ink in cooperation with
A third vibration roller roller (reciprocating roller 3) 42A that receives ink from a third vibration roller 42A that rotates in a predetermined direction at a predetermined speed.
And a fourth kneading roller 44A that receives ink from the third vibration roller 42A while kneading the ink in cooperation with the third vibration roller 42A.
While rotating in a predetermined direction at a predetermined speed and reciprocating in a direction along its own rotation center line, comes into contact with the fourth kneading roller 44A, and cooperates with the fourth kneading roller 44A to form the ink. And a fourth vibration roller (reciprocating roller 4) 46A that receives ink from the fourth kneading roller 44A while kneading the fourth roller 44A. The ink is received from the fourth vibration roller 46A while kneading the ink in cooperation with the vibration roller 46A, and the upper plate roller 14A is located downstream of the first ink forming roller 40A in the rotation direction of the upper plate roller 14A. A second inking roller 48A that contacts and applies ink to the upper plate roller 14A; and rotates in a predetermined direction at a predetermined speed. In addition to receiving the ink from the fourth vibration roller 46A while kneading the ink in contact with the fourth vibration roller 46A and cooperating with the fourth roller 46A, the second ink application is performed in the rotation direction of the upper plate roller 14A. A third inking roller 50A that contacts the upper plate roller 14A and applies ink to the upper plate roller 14A downstream of the roller 48A.

In this embodiment, the upper ink fountain 1
About 60% of the amount of ink supplied from 6A to the upper inking unit 18A is supplied to the upper plate roller 14A via the first inking roller 40A, and about 20% of the amount of ink is supplied to the second plate 14A. Is supplied to the upper plate roller 14A via the ink forming roller 48A, and the remaining ink amount of about 20% is supplied to the third ink forming roller 50A.
Is supplied to the upper plate roller 14A.

The upper inking unit 18A of this embodiment further contacts the upper plate roller 14A on the upstream side of the first inking roller 40A in the rotation direction of the upper plate roller 14A to contact the upper plate roller 14A. Hickey roller 52 for removing objects causing hickey from the printing plate
A is also included.

In this embodiment, the radiation thermometer 54 is used as a representative of the temperature in the internal space covered by the cover 19A.
A indicates the surface temperature of the fourth vibration roller 46A.

In the internal space of the cover 19A, as a cooling means, gas ejection nozzles 100 are provided corresponding to desired portions of the upper inking unit 18A and the lower inking unit 18B, respectively. 100
, A desired amount of cooling air is blown to the desired location.

The temperature and amount of the cooling air blown from the gas ejection nozzle 100 are controlled by cooling control means (not shown) based on a representative temperature in the internal space measured by the radiation thermometer 54A.

The temperature and amount of the cooling air blown from the gas ejection nozzle 100 can be made higher during the warm-up operation of the offset printing machine than in the normal operation. For this reason, the temperature in the internal space of the cover 19A (corresponding to the temperature of the upper inking unit 18A and the temperature of the ink in the internal space) is quickly raised to a vicinity of a desired temperature. Can be done.

During the normal operation of the offset printing press, the cooling control means (not shown) is operated by the radiation thermometer 54A shown in FIG.
The temperature and amount of the cooling air blown from the gas ejection nozzle 100 are adjusted so that the temperatures measured by the radiation thermometers 54A and 54B become the desired temperatures based on the actual temperatures measured by. The cooling air can be supplied using an air cooling device conventionally used in a place where an offset printing machine is used.

In this embodiment, the upper inking unit 18A and the lower inking unit 18B
The gas ejection nozzle 100 for the
A, 24B, first kneading rollers 30A, 30B, fourth kneading rollers... 44A, 44B, copper plating rollers 34A,
34B, second vibration rollers 38A, 38
B, and cooling air is blown toward the plate cylinders 14A and 14B.

As a result, the upper inking unit 1 is operated during the operation of the offset printing press according to the above-described embodiment.
8A, the temperature of the ink supplied from the upper ink fountain 16A to the upper plate cylinder 14A and the temperature of the ink supplied from the lower ink fountain 16B to the lower plate cylinder 14B by the lower inking unit 18B are set to desired temperatures. Since the viscosity of the ink is maintained at a desired value, the amount of ink supplied from the upper ink fountain 16A to the upper plate cylinder 14A by the upper inking unit 18A and the lower ink unit 18B can be maintained by the upper inking unit 18A. From the lower ink fountain 16B to the lower plate cylinder 14
B can be set to desired values, respectively, and the combination of the upper plate cylinder 14a and the upper blanket cylinder 12A, and the lower plate cylinder 14B and the upper blanket cylinder 12
In each of the combinations with B, the balance with the amount of ink transferred to both sides of the print medium 10 can always be appropriately adjusted. For this reason, it is possible to reliably prevent the excess ink from being attached to the print medium 10 and contaminating the print medium 10 with the former combination and the latter combination.

In addition, the temperature of the ink supplied to the former combination and the latter combination is adjusted to the best temperature necessary for printing an image on both sides of the printing medium 10 in the best condition of the ink. You can always do it.

In the embodiment shown in FIG. 1, only one temperature is measured in each of the upper inking unit 18A and the lower inking unit 18B, but the ink in the upper inking unit 18A is measured. Original roller 22A, first vibration roller (reciprocating roller 1) 28A, second vibration roller (reciprocating roller 2) 38A, third vibration roller (reciprocating roller 3) 42A, fourth vibration roller (reciprocating roller 4) 46A and copper plating roller 34A
, One or more or all of them, or the ink source roller 22B, the first vibration roller (reciprocating roller 1) 28B, and the second vibration roller (reciprocating roller 2) of the lower inking unit 18B. ) 38B, a third vibration roller (reciprocating roller 3) 42B, a fourth vibration roller (reciprocating roller 4) 46B, and one or more or all of the surfaces of the copper plating roller 34B, which are different from the above-mentioned one point. The temperature is measured by, for example, a radiation thermometer, or the surface temperature of the upper plate cylinder 14A or the lower plate cylinder 14B is measured by, for example, a radiation thermometer, or in the upper inking unit 18A, Ink feed roller 24A, which tends to increase in temperature during operation of offset printing press, ink Only pass roller 26A, the first to fourth distribution roller 30A, 32A, 36A, 44A, first
The surface temperature of one or more or all of the inking rollers 40A, the second and third inking rollers 48A, 50A is measured by, for example, a radiation thermometer, or the above-mentioned temperature is measured in the lower inking unit 18B. In one embodiment, the temperature of the ink supply roller 24B, the ink transfer roller 26B, and the first, third, and fourth mixing rollers 30B, 3B, which are likely to increase in temperature during operation of the offset printing press.
6B, 44B, the first inking roller 40B, the second and third inking rollers 48B, 50B may be used to measure the surface temperature of one or more or all of them, for example with a radiation thermometer, or all of the above. Are measured by, for example, a radiation thermometer, and the above-described cooling is performed based on the surface temperatures of at least one of each of the upper inking unit 18A and the lower inking unit 18B thus measured. The temperature and amount of the cooling air blown from the gas ejection nozzle 100 are adjusted by the control means, and the temperature of each of the upper inking unit 18A and the lower inking unit 18B, that is, the temperature of the ink in each of the above, is represented by the viscosity. Can always be maintained at a desired value.

Ink feed roller 24A or 24B
Swings between the ink supply roller 22A or 22B and the ink transfer roller 26A or 26B so as to contact them alternately in order to transport ink from the ink supply roller 22A or 22B to the ink transfer roller 26A or 26B. In the meantime, due to the impact force generated by the contact, the ink feeding roller 24A or 24B
In addition, the temperature of the ink source rollers 22A or 22B and the ink transfer rollers 26A or 26B tends to increase relatively easily.

The first vibration roller (reciprocating roller 1) 28A or 28B, the second vibration roller (reciprocating roller 2) 38A or 38B, and the third vibration roller (reciprocating roller 3) 42A or 42
B, fourth vibration roller (reciprocating roller 4) 4
Each of the rollers 6A or 46B reciprocates in a direction along its own rotational center line in a state of contacting the two rollers on both sides in the radial direction to knead ink in cooperation with the two rollers. However, because of this, frictional heat is generated, and the temperature tends to rise relatively easily. Then, the first to fourth vibration rollers 28A, 28B, 38A,
38B, 42A, 42B, 46A, and 46B, the first to fourth vibration rollers 2
8A, 28B, 38A, 38B, 42A, 42B, 46
A, 46B and the first to fourth vibration rollers 28A, 28B, 38A, 38B, 42A, 42.
The temperature tends to rise relatively easily due to heat conduction from B, 46A, 46B.

In one embodiment shown in FIG. 1, the first to fourth vibration rollers 28A, 28B,
The rollers that come into contact with 38A, 38B, 42A, 42B, 46A, 46B are first vibration rollers 28A.
Or 28B, an ink transfer roller 26A or 26B and a first mixing roller 30A or 30B, and a second vibration roller 38A or 38B.
To the third kneading roller 36A or 36B and the first kneading roller 36A or 36B.
The third vibrating roller 42A or 42B, the third kneading roller 36A or 36B and the fourth kneading roller 44A or 44B, and the fourth vibrating roller 46A or 40B. 46B, the fourth kneading roller 44A or 44B and the second inking roller 4
8A or 48B and the third inking roller 50A or 50B.

In the embodiment shown in FIG. 1, the first to fourth ink mixing rollers 30A or 30A are further provided.
B, 32A, 36A, 36B, 44A, 44B are covered with a material having a high coefficient of friction, for example, rubber.
Among these, the first and second ink mixing rollers 30A and 32A that are in contact with each other generate large frictional heat and the temperature is relatively likely to rise.

The ink source roller 22A, the first vibration roller (reciprocating roller 1) 28A, the second vibration roller (reciprocating roller 2) 38A, and the third vibration roller (reciprocating roller 3) 42A of the upper inking unit 18A. , A fourth vibration roller (reciprocating roller 4) 46A, and a copper plating roller 34
A, the ink source roller 22B of the lower inking unit 18B, the first vibration roller (reciprocating roller 1) 28B, the second vibration roller (reciprocating roller 2) 38B, and the third vibration roller (reciprocating roller 3) 42B. , The fourth vibration roller (reciprocating roller 4) 46B, and the copper plating roller 34B each have a hollow hole through which a fluid, for example, a liquid, passes, and the temperature and amount of the fluid are controlled. It can also be configured to maintain a desired temperature.

The temperature of the inner space of each of the covers 17A and 17B for the upper inking unit 18A and the lower inking unit 18B is measured at a desired position in the inner space by a desired known thermometer. It can be temperature. A thermograph can be used as a known thermometer.

The upper inking unit 18A and the lower inking unit 18B configured as described above are used.
Is also applicable to an offset printing press using a dampening solution. In this case, the fluidity of the ink in the upper inking unit 18A and the lower inking unit 18B is the same as that of a conventional offset printing press using a dampening solution. Since the control can be performed better than the upper inking unit and the lower inking unit, printing can be performed with a more stable print density than before.

The gas ejection nozzle 100 of the cooling means is connected to the upper inking unit 18A and the lower inking unit 1A.
The cooling air can be jetted toward a desired roller or all the rollers in each of the plurality of rollers of FIG. 8B.

Further, if the cooling means is excellent in cooling capacity, the gas jetting nozzle 100 does not jet cooling air toward each of the plurality of rollers of the upper inking unit 18A and the lower inking unit 18B. The cooling air can be jetted to any position in the inner space of the covers 17A and 17B.

As described in detail above, the water according to the present invention
And according to the offset printing machine, the blanket cylinder and the plate cylinder without stopping frequently operated for frequent cleaning of the blanket cylinder and plate cylinder in the case of high speed operation and when used over a long period It can prevent excess ink from collecting,
Extra ink by Ru can be prevented <br/> that stain occurs on a print medium.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing one of the rotary presses used in an offset printing press according to one embodiment of the present invention.

[Explanation of symbols]

10 print media, 12A, 12B blanket cylinder, 1
4A: Upper plate roller, 14B: Lower plate roller, 16A: Upper ink fountain, 16B: Lower ink fountain, 17A, 17B: Cover,
18A: upper inking unit, 18B: lower inking unit, 19A, 19B: piping, 20A, 20B: ink key, 22A, 22B: ink source roller, 24A,
24B ... call-up roller, 26A, 26B ... transfer roller, 28A, 28B ... first vibration roller, 30A, 30B ... first kneading roller, 32A ... second
Kneading rollers, 34A, 34B ... copper plating rollers, 36
A, 36B: third kneading roller, 38A, 38B: second
, A first inking roller, 42A, 42B, a third vibration roller, 44A, 44B, a fourth kneading roller, 46
A, 46B... Fourth vibration roller, 48A,
48B: second inking roller, 50A, 50B: third inking roller, 52A, 52B: Hickey roller, 54A, 54B: radiation thermometer, 100: gas ejection nozzle (cooling means).

Claims (7)

(57) [Claims] 1. A cooling means for covering an inking unit for supplying ink from an ink fountain to a plate cylinder, including an ink fountain, to cool an internal space; and a temperature measuring means for measuring a temperature in at least one portion of the internal space. When; temperature measuring means cooling control means and for controlling the operation of the cooling means based on the measured temperature by; waterless offset printing press, characterized by comprising a. 2. The inking unit includes a plurality of rollers that supply ink from an ink fountain to a plate cylinder in contact with each other while rotating, and the temperature measuring unit includes a plurality of rollers. The waterless offset printing press according to claim 1, wherein the temperature of at least one of the rollers whose temperature is relatively easily increased is measured. 3. The offset without water according to claim 2, wherein the roller whose temperature is relatively easy to rise is at least one of an ink source roller, an ink feeding roller, and an ink transfer roller. Printer. 4. The waterless offset printing according to claim 2, wherein the roller whose temperature is relatively easy to rise is at least one of a vibration roller and a roller that comes into contact with the vibration roller. Machine. 5. A roller whose temperature is relatively easy to rise is at least one of ink forming rollers that are in contact with each other, and the ink forming rollers that are in contact with each other are made of a material having a high coefficient of friction. The waterless offset printing press according to claim 2, wherein the surface is covered. 6. The waterless offset printing press according to claim 1, wherein the cooling unit sends cooling air to the internal space to cool the internal space. 7. The waterless offset printing press according to claim 1, wherein the temperature measuring unit further measures a temperature of the printing plate.