JP3462851B2 - Printing equipment in 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 printing device in a printing machine, and more particularly to an ink supply mechanism in the printing device.

[0002]

2. Description of the Related Art In an offset type newspaper press, as shown in FIG. 4 and FIG. 5 and FIG. The wound paper is attached, fed out with an appropriate tension, printed by the printing device 2, cut in the width direction, width-aligned, stacked, etc. in the web path unit 3 and conveyed to the folding machine 4, where the folding machine 4 It is designed to be folded, cut, and discharged as a signature.

The printing device 2 has a plate cylinder 7 on the surface of which is printed a printing plate on which a pattern to be printed is printed. The ink supplied to this pattern is wound on the surface of the blanket cylinder 6. Printing is performed by transferring the ink on the blanket, and further transferring the ink on the blanket to the web 5 which is the printing target. Water is easily attached to the portions other than the pattern of the printing plate wrapped around the plate cylinder 7, and the printing drum 7 is provided so that dampening water is given to the printing plate before the ink is attached.
A dampening water device 8 is provided prior to the ink supply device 24 in the rotation direction of the. Therefore, ink cannot be attached to the portion to which water is attached by the dampening water device 8, that is, the portion other than the image on the printing plate, and is attached only to the image. Further, the water adhering to the plate of the plate cylinder 7 flows back into the ink from the inking roller 9, and the mixed water acts in the same manner as the water from the dampening water device, and comes into contact with parts other than the pattern. Then, the water adheres before the ink.

As the ink to be attached to the pattern portion of the above-mentioned printing plate, it is preferable to supply the ink having the same film thickness of about 1 micron for both large and small patterns to be printed.
By always supplying the ink in proportion to its consumption,
It is necessary to keep that state. As an ink supply mechanism to the plate cylinder 7, a keyless type shown in FIG. 5, which has been used in recent years, a vase type shown in FIG. Basically, there is an ink pump type similar to the vase type.

The ink fountain type and ink pump type (not shown) ink supply portions 25 shown in FIG. 6 are divided into a plurality of ink source rollers 12, a side plate (not shown), and a width direction, which are individually provided. The ink fountain 15 is formed by the ink key 16 and the ink key 16. By adjusting the gap between each ink key 16 and the ink source roller 12, the ink film thickness is adjusted when the ink stored in the ink fountain 15 is supplied to the ink source roller 12, and the ink consumption amount in the corresponding range is adjusted. I am trying to supply a suitable amount. In FIG. 6, 9 is an inking roller, 10 is an ink roller group, and 11 is an ink delivery roller.

Also, in the case of the ink pump type, a plurality of ink pumps are similarly provided in the width direction to supply ink in proportion to the amount of ink consumed in the area supplied by each ink pump. Type and ink pump type ink supply amount can be adjusted by measuring the image area ratio of the printed pattern in advance before printing and presetting the opening of the ink key 16 or the ink pump supply amount corresponding to the value. There is.

In the keyless type shown in FIG. 5, which has been used recently, the ink supply side supplies ink with a constant width, and the remaining roller on the roller after being consumed according to the pattern of the printing plate. The ink is scraped off by the history elimination doctor 19 and consumed over the entire width, and a uniform ink film is always supplied to the printing plate by balancing the supply and consumption of ink, making adjustments in the width direction of the ink supply unnecessary. I am doing it. In FIG. 5, 20 is an ink supply doctor, 21 is an ink supply nozzle, 22 is an ink circulation tank, and 23 is an ink pressure feed pump.

[0008]

However, in the case where a plurality of ink supply adjusting mechanisms are provided in the width direction, such as the fountain type and the ink pump type shown in FIG. It is very numerous, complicated, requires skillful operation, is time consuming, and is time consuming and expensive to maintain, resulting in high manufacturing costs.

Further, since it is necessary to adjust the amount of ink in the width direction, it is necessary to perform presetting before printing and correction work during printing. An image rate measuring means and equipment for converting the data obtained by the measuring means into an ink fountain or an ink pump adjustment value and transmitting the data to the ink key of each ink fountain or the ink pump are required.

Further, in this vase type and the ink pump type, the film thickness of the ink supplied to the printing plate is constant within the range divided in the width direction, but for example, a small image area is present in a wide image area. In some cases, since the ink film thickness is thin, the ink film thickness deposited on the image area is also thin, and the density is different from other image areas.

In the keyless type shown in FIG. 5, adjustment of the ink amount in the width direction is unnecessary, but the scraping performance of the history eliminating doctor 19 influences the printing quality, and uneven scraping in the width direction causes print density. Non-uniformity results in poor print quality. Furthermore, since the blade of the doctor 19 is worn out, replacement work is required, and the running cost is high.

Therefore, in the present invention, a simple and inexpensive mechanism does not require skill and time for operation, does not cause deterioration of print quality due to uneven print density, and measures the area ratio of the printed image and the measurement. Data by means of ink fountain,
Alternatively, it is an object to provide an ink supply mechanism in a printing device that does not require an ink key of each ink fountain, an ink key of each ink fountain, or equipment for controlling by transmitting to the ink pump.

[0013]

In order to solve the above problems, in the present invention, a dampening water device is provided with an adjusting roller group composed of a hydrophilic roller connecting between the printing plate and the upstream roller of the ink supply device 24. The dampening water supplied to the printing plate from No. 8 first made contact with this adjusting roller group. The adjusting roller group supplies the ink supply device 24 with dampening water corresponding to a large amount of dampening water and a small amount of dampening water on the plate.
To the upstream side roller so that the amount of ink transferred to the upstream side roller is changed and the amount of ink supplied to the printing plate is controlled.

By doing so, when a large amount of dampening water is transmitted from the adjusting roller group to the upstream roller of the ink supply device 24, the amount of ink transferred to the ink supply device 24 is reduced, and conversely When less water is transmitted, the amount of ink transfer increases. Therefore, it is possible to supply ink according to the size of the pattern area on the printing plate without using an ink key or a doctor blade. Therefore, a simple and inexpensive mechanism does not require skill and time for operation, and does not cause print quality deterioration due to uneven print density. Alternatively, it is possible to provide an ink supply mechanism in a printing machine that does not require an ink key of each ink fountain and a facility for transmitting the control value to the ink pump to control the ink pump.

Therefore, in the present invention, as described in claim 1, the ink is fed from the ink supply portion to the ink source roller.
After supplying the ink, the ink delivery roller and the ink
Printing on the plate cylinder via the roller and inking roller
Ink roller group path for supplying ink to the plate and the plate cylinder
And a roller for supplying dampening water to the printing plate
In the printing device, the printing drum contact position of the watering roller
Of the plate cylinder between the printing plate and the inking roller contact position on the plate cylinder.
Is the first roller in contact with the circumferential surface of the plate cylinder along the direction of rotation?
Ink source roller or ink delivery roller (hereinafter
Below these two rollers contact the upstream roller)
Configure the adjustment roller group path to the other rollers and use it for the printing plate.
The supplied dampening water is fed through the adjusting roller group path to the upstream side.
Ink supply according to the image coverage of the printing plate
The amount is transmitted to the upstream roller so that
And at least one roller forming the adjusting roller group path.
Roller surface is hydrophilic or a mixture of lipophilic and hydrophilic
Characterized in that it is a over La.

With this structure, as described above, it is possible to transmit the dampening water corresponding to the place where the dampening water is large and the place where the dampening water is small, to the upstream side roller in the ink supply device. As a result, the amount of ink transferred to the roller on the upstream side of the ink supply device changes, and it becomes possible to control the amount of ink supplied to the printing plate. This eliminates the need for ink keys, a doctor blade, and a printing image area ratio measuring means and ink supply amount control means based on the measurement results, and does not require skill and time for operation with a simple and inexpensive mechanism, and printing. It is possible to provide an ink supply mechanism that does not cause deterioration of print quality due to uneven density.

[0017] Then the adjusting rollers, as described above, the roller constituting the adjustment roller group is preferably more than one is a roller having a hydrophilic surface, was or <br/>, before Symbol It is preferable that one or more of the rollers forming the adjusting roller group have a surface in which lipophilicity and hydrophilicity are mixed. Further, the ink supply device upstream of the roller adjustment rollers are in contact, i Nki supply portion in contact with the roller, or the downstream roller, roller or Taso is a surface lipophilicity and hydrophilicity are mixed It is preferable that the roller has.

As described above, the rollers forming the adjusting roller group are hydrophilic and rollers having both hydrophilicity and lipophilicity mixed,
Moreover, by making the roller on the upstream side of the ink supply device, which comes into contact with the adjustment roller group, the roller that comes into contact with the ink supply part or the roller on the downstream side, the dampening water supplied to the printing plate by the dampening device can be more reliable. Is transmitted to the roller on the upstream side of the ink supply device, and the amount of ink supplied can also be controlled more reliably by the dampening water transmitted to the ink supply device side.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative positions, and the like of the constituent parts described in this embodiment are not intended to limit the scope of the present invention thereto, unless otherwise specified, and are merely It is only an example.

1 (a) to 1 (c) are schematic configuration diagrams of an ink supply mechanism of a printing apparatus according to the first embodiment of the present invention, and FIG. 1 (1-d) is the same as the present invention. 2 is a schematic configuration diagram of an ink supply mechanism of a printing apparatus according to a second embodiment of the present invention, FIG. 2 is a view showing an example of an ink supply unit that supplies ink to the ink source roller of FIG. 1, and FIG. It is a structure explanatory view of a roller used for an ink supply mechanism in a printer concerning a 3rd embodiment. In the figure, the same parts as those of the above-mentioned conventional one are designated by the same reference numerals.

In FIG. 1, 2 is a printing device, 5 is a web (printing paper), 7 is a plate cylinder, 8 is a dampening water device, 9a and 9b are inking rollers, 10 is an ink roller group, and 11 is an ink transfer roller. , 12 are ink source rollers, 13 are watering rollers of the dampening water device 8, 17 are ink reciprocating rollers, 1
2 is an ink adjusting roller group for transmitting the dampening water supplied to the printing plate wound around the plate cylinder 7 to the upstream side roller of the ink supplying device 24, 24 is an ink supplying device, and 25 is an ink supplying unit. Reference numeral 12 is an ink source roller, 15 is an ink fountain, 16 is an ink key, 20 is an ink supply doctor, 21
Is an ink supply nozzle, 22 is an ink circulation tank, and 23 is an ink pressure feed pump.

Of these, the ink supply unit 25 is a device for supplying ink to the ink source roller 12 as shown in FIG. 2, and FIG. 2 (2-a) shows the ink in the ink circulation tank 22. Ink supply nozzle 2 with ink pressure pump 23
1 to the ink source roller 12, and the ink supply doctor 20 provides a constant film thickness. In FIG. 2 (2-b), the ink stored in the ink fountain 15 is divided into the ink source roller 12 and the ink key 16. By adjusting the gap, a uniform film thickness can be supplied.

FIG. 1 shows the ink supply mechanism of the printing apparatus according to the first embodiment of the present invention (1-
(a) to (1-c) show various modifications of the arrangement of the ink supply and adjustment rollers of the present invention. (1
In -a), the ink supply roller 9 is used for ink supply.
a, 9b, an ink reciprocating roller 17, an ink delivering roller 11, and a roller provided between the ink reciprocating roller 17 and the ink delivering roller 11, (1-b)
Is a configuration in which the roller between the ink reciprocating roller 17 and the ink delivery roller 11 is omitted from the configuration of (1-a), (1
In FIG. 7C, the two rollers of the ink adjusting roller 18 are further omitted from the configuration of (1-b).

As described above, the present invention replaces the conventional history eliminating doctor 19 with the adjusting roller group 1 between the printing plate wound around the plate cylinder 7 and the upstream rollers forming the ink supply device 24.
8 is provided, and the dampening water supplied to the printing plate is supplied to the adjusting roller group 1
8 is transmitted to the roller on the upstream side constituting the ink supply device 24 so that the ink supply amount corresponding to the image rate of the printing plate can be obtained. This adjusting roller group 18
As shown in FIG. 1, it is composed of a first roller 18a provided between the dampening water device 8 and the inking roller 9 and other rollers 18n. The first roller 18a is the inking roller 9a. , 9b and the wetting roller 13, they can be attached to and detached from the plate cylinder 7 by an attaching / detaching mechanism (not shown).

The adjusting roller group 18 has at least one hydrophilic roller such as a hydrophilic resin roller, a chrome-plated roller, or a roller that forms a hydrophilic and lipophilic surface at an appropriate ratio. Configure. Incidentally, the rollers of the ink roller group 10 which are not particularly described have a lipophilic surface.

In the printing apparatus constructed as described above, the dampening water supplied from the dampening water apparatus 8 to the printing plate wound around the plate cylinder 7 is easily treated with water on the printing plate. Adhere to the image area (the area where ink should not adhere). The ink supplied from the ink supply unit 25 as shown in FIG. 2 is supplied from the ink source roller 12 to the ink delivery roller 11 and the ink roller group 10 to the printing plate. However, since the dampening water repels the ink, the ink supplied to the printing plate cannot adhere to the non-image area, but adheres to the area that becomes the image area. Then, the ink attached to the image area is printed on the web (printing paper) 5 to perform printing.

On the other hand, the first roller 1 of the adjusting roller group 18
As is apparent from FIG. 1, 8a first contacts the dampening water supplied from the dampening water device 8 to the plate wound around the plate cylinder 7, and this dampening water contacts the roller 18a. Adhere to.
As the rollers of the adjusting roller group 18, the hydrophilic rollers are appropriately arranged as described above, so that the dampening water adhering to the roller 18a is sequentially transmitted to the rollers of the adjusting roller group 18, and the ink supplying device 24 The upstream side roller, that is, (1-a) to (1-c) in FIG. 1, flows back to the ink delivery roller 11, and in (1-d) in FIG.

The amount of the dampening water which is transmitted in the backflow is such that the dampening water is large in a portion on the printing plate where the printing pattern is small and the dampening water is small in the portion where the printing pattern is large. Therefore, a lot of dampening water that has flowed back to the surface of the ink delivery roller 11 is formed at some places, and a little place is made. The amount of ink transferred from the ink source roller 12 varies depending on the amount of this water. In other words, less ink transfers to the ink delivery roller 11 where there is much dampening water, and more ink transfers to the ink delivery roller 11 where there is less dampening water. This is because the amount of ink on the printing plate is proportional to the amount of printed patterns and the amount of printed patterns is small.
The amount of ink transfer to the ink transfer amount to the ink transfer roller 11 is decreased, and the amount of dampening water is increased in a portion having a small print pattern, and the ink transfer transferred from the ink supply side to the ink transfer roller 11 is reduced.
The amount of dampening water decreases in the portion where the printed pattern is large, and the ink transfer transmitted from the ink supply side to the ink delivery roller 11 increases.

As described above, according to the present invention, a large amount of ink is transferred to the ink delivery roller 11 in a portion where a large amount of ink is consumed, and a small amount of ink is transferred in a portion where a small amount of ink is consumed, so that consumption and supply are balanced. As a result, the degree of ink transfer is self-adjusted according to the amount of the printed pattern.

FIG. 1 (1-d) is a schematic configuration diagram of an ink supply mechanism of a printing apparatus according to the second embodiment of the present invention, and is from (1-a) to (1-c) of FIG. In the illustrated first embodiment, the ink supply roller 11 is used instead of the ink supply device upstream roller which the adjustment roller group 18 contacts. By doing so, in addition to the same operation and effect as those of the first embodiment, the upstream roller of the ink supply device with which the adjustment roller group 18 is in contact is adjacent to the ink supply section 25, and the dampening is performed. This has the effect of increasing the degree of influence of ink transfer control by water.

FIG. 3 is a structural explanatory view of the rollers used in the ink supply mechanism of the printing apparatus according to the third embodiment of the present invention, in which the adjustment roller group 18 according to the first and second embodiments is in contact. The roller on the upstream side of the ink supply device is a roller whose surface is oleophilic, instead of a roller whose surface is normally oleophilic, as shown in FIG.

The roller in FIG. 3 has enlarged surfaces, as shown in (3-a), (3-b), and (3-c). In this case, the dampening water provided from the adjusting roller group 18 is
It adheres to this roller more firmly than an oleophilic roller, and can control ink transfer more effectively. The existence pattern of the lipophilic and hydrophilic portions is not limited to the illustrated one.

The roller shown in FIG. 3 is the upstream roller of the ink supply device 24 with which the adjusting roller group 18 comes into contact, that is, the ink transfer roller 11 in (1-a) to (1-c) of FIG. , (1-d) is used for the ink source roller 12, it is possible to more reliably control the amount of ink deposited from the ink supply unit 25 by the dampening water transmitted from the adjustment roller group 18.

As described above, according to the present invention, unlike the history-removing doctor 19 in the keyless system, the doctor blade for scraping ink from the ink roller is not required, and there is no fear of scraping failure, and replacement work is possible. And the workability is improved. Further, in the case of the ink fountain type, a plurality of ink adjustment mechanisms provided in the width direction are unnecessary, and therefore, the image area ratio measuring device for presetting the mechanism, the data transmission device, and the drive control of each adjustment mechanism are performed. A control device, a display device, a scanning device, and the like for doing so are unnecessary, and the device is simple and has good workability and is inexpensive.

In the above description, an offset type newspaper press is used as an example of the printing machine, but the present invention is applied not only to the newspaper press but also to ordinary presses and sheet-fed presses. It is clear that you can do it.

[0036]

As described above, according to the present invention as set forth in claim 1, a large amount of moisture is applied to the upstream side roller of the ink supply device by the adjusting roller group connecting the printing plate and the upstream side roller of the ink supply device. When the dampening water is transferred, the ink transfer amount from the ink supply unit to this roller is small, and conversely, when the dampening water is transferred in small amount, the ink transfer amount is large.
Therefore, it is possible to supply ink according to the size of the pattern area on the printing plate without using an ink key or a doctor blade. Therefore, the ink key, doctor blade, and the printing image image area ratio measuring means and the ink supply amount control means based on the measurement results are not required, and a simple and inexpensive mechanism does not require skill and time for operation and printing. It is possible to provide an ink supply mechanism that does not cause deterioration of print quality due to uneven density.

In this adjusting roller group, according to the invention described in claims 2 to 5, the roller forming the adjusting roller group is a roller having hydrophilicity and a mixture of hydrophilicity and lipophilicity, and the adjusting roller is By making the roller on the upstream side of the ink supply device that contacts the group the roller that contacts the ink supply unit or the roller on the downstream side, the dampening water supplied to the printing plate by the dampening device will be more reliable. The dampening water transmitted to the upstream roller and also to the ink supply device side can more reliably control the ink supply amount.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an ink supply mechanism of a printing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of an ink supply unit that supplies ink to an ink source roller.

FIG. 3 is a structural explanatory view of a roller used for an ink supply mechanism in a printing apparatus according to a third embodiment of the present invention.

FIG. 4 is a schematic view of an entire offset type newspaper press.

FIG. 5 is an explanatory diagram of a printing device including a keyless ink supply device.

FIG. 6 is an explanatory diagram of a printing device including an ink key type ink supply device.

[Explanation of symbols]

2 printing devices 5 Web 6 blanket body 7 plate body 8 fountain solution 9 Inking roller 10 Ink roller group 11 Ink delivery roller 12 Ink source roller 13 Watering roller 17 Ink reciprocating roller 18 Ink adjustment roller 24 Ink supply device 25 Ink supply section

─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-58-132560 (JP, A) JP-A-1-145147 (JP, A) JP-A-6-286098 (JP, A) JP-A-7- 309005 (JP, A) JP-A-7-266534 (JP, A) JP-A-6-305109 (JP, A) Actual opening Sho 63-30146 (JP, U) Actual opening Sho 63-30147 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41F ⁷ /24-7/40 B41F 31/02-31/14 B41F 31/26

Claims (2)

(57) [Claims] 1.From the ink supply unit to the ink source roller
After supplying the ink, the ink delivery roller and the ink
Printing on the plate cylinder via the roller and inking roller
Ink roller group path for supplying ink to the plate and the plate cylinder
And a roller for supplying dampening water to the printing plate
In the printing device, The plate cylinder contact position of the watering roller and the inking roller
A plate cylinder circumferential surface along the plate cylinder rotation direction between the plate cylinder contact positions
From the first roller that comes in contact with the top,
Control the other rollers that come into contact with the ink delivery roller.
The fountain solution supplied to the printing plate is configured as
Transmission to the upstream roller by adjusting roller group path
So that the ink supply amount can be obtained according to the printing plate area ratio.
To the ink source roller or ink transfer roller
In addition to transmitting the
At least roller surface 1 is hydrophilic or lipophilic and hydrophilic
It is a roller with mixed characteristics For printing machines characterized by
Printing device. 2. The first roller is attached / detached by a detaching mechanism.
Characterized by being configured to be removable from the plate cylinder
The printing device according to claim 1.