JPH0832446B2 - Ink supply cutoff device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ink supply of a printing machine, and more specifically, shuts off ink supply to a plate mounting area of a printing machine including a letterpress or planographic printing plate. More particularly, the present invention relates to an offset rotary printing press, for example, a keyless type inking device, which is capable of interrupting the ink supply in association with the excess supply control of dampening water.

[Conventional technology]

As for the device for selectively selectively blocking the ink supply to the printing machine, no known example is currently found.

Various types of devices have been developed for optimally controlling the amount of ink supplied to the printing plate.
-200962 and Japanese Utility Model Laid-Open No. 63-18244 are known.

The ink supply device described in JP-A-1-200962 is
Ink source roller (also known as fountain roller) is divided into a large number in the axial direction, and each divided part can be driven independently and its peripheral speed can be changed to support ink with a wide range of viscosities. In addition, the optimum amount of ink can be adjusted and supplied for each divided portion.

In addition, the ink supply device described in Japanese Utility Model Laid-Open No. 63-18244 is provided with a blade above the ink discharge part to set the ink film thickness on the ink source roller to an arbitrary value that is uniform in the width direction. I will get it.

There are many other known inking devices, but each of them supplies an appropriate amount of ink in each supply region, or a keyless type ink supply device supplies a constant appropriate amount of ink over the entire region. It is a device that keeps the printing quality good.

In offset rotary printing, the mutual repulsion of oil and water is used to supply ink to the image area of the plate surface and to supply water to the non-image area. On the other hand, correspondingly, water (hereinafter referred to as dampening water) is also supplied. By the way, recently, for example, with the shortening and simplification of the ink supply system as seen in the keyless type ink device, the surplus dampening water supplied invades the ink supply system, and among them, The dampening water may reach the ink source roller or the ink source,
As a result, it becomes difficult to supply ink, and various proposals have been made in the past for measures against the problem.

[Problems to be Solved by the Invention]

Now, the inventors of the present application have studied the quantitative amount of dampening water that enters the inking device through the plate surface, and as a result, for example, in the following cases, the amount of dampening water significantly increases. , Found that the supply of ink is often hindered.

That is, first, for example, in a newspaper offset rotary press or the like in which a printing plate having a size of four pages of a newspaper can be mounted in parallel in the circumferential surface axial direction of the plate cylinder, for example, like spot printing,
When using a one-sided printing plate for the purpose of printing only on one part of a certain page, while the amount of ink supplied is small, the dampening water supplied to the vast non-printing area is used. A large amount produces a large amount of excess dampening water.

Secondly, due to various reasons such as pagination, a large amount of excess dampening water is generated even when a discarded plate, that is, a printing plate having no printing image area is used.

When such an eccentric printing plate or a waste plate is used and the ink supply system is, for example, the keyless type described above, the amount of dampening water entering the ink supply system increases remarkably. The ink from the ink source is prevented from adhering to the peripheral surface of the ink source roller, making it difficult to supply the ink.

A first object of the present invention is to provide a device capable of selectively interrupting the ink supply only in a certain part in the ink supply of a printing machine including a letterpress or a planographic printing plate.

A second object of the present invention is to provide offset printing,
For example, when dampening water significantly enters the inking device through an area without an image line by using a one-sided printing plate or a waste plate in the plate mounting area, or It is an object of the present invention to provide an ink supply interrupting device that can complete printing without causing any inconvenience regarding the supply of ink during printing operation.

[Means for solving the problem]

The ink supply / interruption device according to the present invention comprises a large number of divided roller portions formed by dividing the ink source roller in the axial direction, and a rotation stopping mechanism capable of individually coming into contact with and separating from the peripheral surface of each of the divided roller portions. And the thickness of the ink film supplied to the peripheral surface of the ink source roller is smaller than the gap between the peripheral surface of the ink source roller and the peripheral surface of the roller immediately downstream thereof. It can be controlled individually for each width.

Alternatively, the ink supply / interruption device according to the present invention is arranged in parallel with the ink source roller in the axial direction of the peripheral surface of the ink source roller, and individually adjusts the contact / separation with respect to the peripheral surface of the ink source roller. With a possible large number of divided doctor mechanisms, the thickness of the ink film supplied to the peripheral surface of the ink source roller is greater than the gap between the peripheral surface of the ink source roller and the peripheral surface of the roller immediately downstream thereof. The width of the division can be individually controlled so as to be small.

Further, the ink supply interrupting device according to the present invention has, in each of the above-mentioned configurations, a water-jet roller and a water-jet roller which are arranged side by side in the axial direction of the circumferential surface of the water-jet roller and which are individually arranged with respect to the circumferential surface of the water-jet roller. The ink is divided into a plurality of divided blade mechanisms whose contact width is adjusted so that the divided width can be adjusted according to the divided roller portion or the divided width of the divided doctor mechanism. A dampening water supply control means that can individually control the water supply in association with the position of the supply cutoff is additionally provided.

[Action]

According to the above configuration, the ink control means is operated to make the thickness of the ink film on the peripheral surface of the ink source roller smaller than the gap between the peripheral surface of the ink source roller and the peripheral surface of the roller immediately downstream thereof. Since the ink cannot be transferred to the peripheral surface of the roller immediately downstream, the ink supply to the printing plate of the plate cylinder can be interrupted.

If the ink control means is operated corresponding to the non-image area on the plate of the plate cylinder, the ink supply is cut off only to the non-image area.

In the case of an offset rotary printing press, if the dampening water supply control means is also operated corresponding to the operation of the ink control means, the supply of dampening water to the non-image area can be cut off. As a result, dampening water is prevented from entering the inking device via the non-image area.

〔Example〕

The present invention will be described in detail below by way of specific embodiments with reference to the accompanying drawings.

1 to 6 show an embodiment of the present invention, which is based on an inking device of a known keyless rotary offset printing press and has the following configuration. Ink source roller 1
Is a height at which a part of the ink is immersed in the ink 3 in the ink fountain 2, and is attached so as to be rotatable in the arrow direction.
There is a roller 4 immediately downstream of the ink source roller 1,
The roller 4 is generally called a mesh roller or a metering roller, and is arranged in a state in which the doctor 4a for scraping excess ink is in contact with the peripheral surface of the roller 4 in a posture in which the doctor 4a is reverse to the rotation direction. . Roller 4
The ink from the ink is transferred to the image area of the plate surface of the plate cylinder 6 via the pair of inking rollers 5 and 5a, while the non-image area of the plate surface of the plate cylinder 6 is supplied from the dampening water supply mechanism 7. A fountain solution is supplied, which is then transferred to a blanket cylinder 8 and printed on a web 9 running between that blanket cylinder 8 and another blanket cylinder or impression cylinder 8a.

In the inking device having the above-described configuration, in the present invention, the peripheral surface of the ink source roller 1 and the peripheral surface of the roller 4 immediately downstream of the ink source roller 1 are opposed to each other via the gap L, and the ink source roller 1 is axially arranged, for example. The plate mounting area of the plate cylinder 6 is divided into 16 equal widths to divide into 16 equal-divided roller portions 10,1.
0, 10 ... (See the reference numerals in FIG. 3) are formed.

As shown in FIG. 3, each of the divided roller portions 10, 10, 10, ... Of the ink source roller 1 is selectively engaged or disengaged with respect to a common drive shaft 11 via electromagnetic clutches 12, 12, 12. Operablely mounted, each electromagnetic clutch has, for example, a slip ring mechanism to enable its operation.
Each is connected to the operation unit 14 via 13. Power is transmitted to the drive shaft 11 via the transmission unit 15. 16 is a frame.

Near the peripheral surface of the ink source roller 1, there is provided a rotation stop mechanism 20 that can be individually brought into contact with and separated from the peripheral surface of each of the divided roller portions 10, 10, ... The eccentric rollers 22, 22, 22 ... Which are slightly narrower than the divided widths are arranged side by side on the shaft 21 so as to face the divided roller portions. A indicates the direction in which the eccentric roller 22 rotates.

 The operation of the above configuration is as follows.

In FIG. 1, it is assumed that the printing plate of the plate cylinder 6 has image portions a and b, and it is desired to selectively supply ink only to these image portions and interrupt the ink supply to other portions. In order to deal with this, first, the divided roller portions 10a and 10b of the ink source roller 1 corresponding to the image portions a and b are selected, and the electromagnetic clutch 12, of the divided roller portions 10a and 10b is selected from the operation portion 14. Energize only 12 and drive the roller part to drive shaft 1
1 to enable transmission of rotation, while rotating all the eccentric rollers 22, 22 ... Other than the eccentric rollers 22a and 22b in the rotation stop mechanism 20 as shown by arrow A, The roller portions 10, 10 ... Are pressed.

When the printing machine is operated in the above state, the rotation is transmitted only to the split roller portions 10a and 10b following the drive shaft 11 driven via the transmission portion 15, and adheres to the peripheral surfaces of those roller portions. The ink 3 in the ink fountain 2 is guided out as an ink film, and the thickness of the derived ink film is larger than the gap L, so the ink film is transferred to the peripheral surface of the roller 4 immediately downstream of the ink source roller 1. Then, it is supplied to the image areas a and b in the printing plate of the plate cylinder via rollers 5 and 5a further downstream.

On the other hand, the other split roller portions 10, 10 ... Of the ink source roller 1 are not only separated from the drive shaft 11 by the electromagnetic clutches 12, 12, ...
.. are prevented from rotating together and stopped rotating, so that the ink 3 adhering to the peripheral surfaces of these roller portions is not led out. Therefore, the ink film does not reach the gap L between the roller 4 immediately downstream and the ink source roller 1, and the ink 3 is not supplied to the non-image area of the printing plate.

By the way, since the embodiment of FIG. 1 shows an inking device of an offset rotary printing press, a dampening water supply mechanism 7 is used.
Are attached, and the details of the configuration are shown in FIGS.
The water source roller 71 is mounted rotatably in the direction of the arrow at a height such that a part of it is immersed in the water 75 in the water tank 72, and a brush roller 74 is in contact with the water source roller 71 immediately downstream of the water source roller 71 to repel the brush. Thus, water droplets are splashed on the peripheral surface of the roller further downstream, and the dampening water is supplied to the printing plate of the plate cylinder 6 by the roller further downstream adjacent to the roller. Damping water supply control means 73, 7 for cutting off the dampening water supply
3, 73 ... Have the respective widths corresponding to the divided widths of the ink source roller 1, and the respective tip portions thereof are individually contacted and separated from the peripheral surface of the water source roller 71. The water source rollers 71 are arranged side by side along the axial direction of the circumferential surface.

The combined action of the dampening water supply mechanism 7 having the above-mentioned configuration and the ink supply device is as follows.

First, as described above, in FIG. 1, since the ink 3 is supplied to the image areas a and b in the plate of the plate cylinder 6, dampening water is also supplied to the image areas a and b. Need to do. Therefore, the dampening water supply cutoff blades 73a and 73b corresponding to the image areas a and b are shown in FIGS.
As shown in the figure, the tips of these blades are separated from the peripheral surface of the water source roller 71, and dampening water is supplied.

On the other hand, since the ink 3 is cut off from the non-image areas of the plate of the plate cylinder 6, it is not necessary to supply dampening water. Therefore, as shown in FIGS. 4 and 6, the dampening water supply cutoff blades 73, 73, 73, ... The dampening water supply is cut off in contact with the surface of the.

FIGS. 7 to 9 show another embodiment of the present invention.
6 to 6 are designated by the same reference numerals, and differ from the previous embodiment in the following points.

First, the ink source roller 1 is not divided, and the rotation stopping mechanism 20 does not exist. Instead, the following divided doctor mechanism 30 as the ink control means, that is, a large number of divided doctor blades 31, 31, 31, ... Which can be individually contacted and separated from the peripheral surface of the ink source roller 1, is used as the ink source. Roller 1
Are arranged side by side in the axial direction. The width of each blade corresponds to, for example, a width obtained by dividing the plate mounting area of the plate cylinder 6 into 16 equal parts. The tip of each blade is attached to the ink stay roller 1 by adjusting bolts 32, 32, 32 ...
It can be attached to and detached from the peripheral surface.

 The operation of the above configuration is as follows.

First, when it is desired to supply the ink 3 to, for example, the image areas a and b in the printing plate of the plate cylinder 6, the doctor blades 31a and 31b (the first blades) facing the peripheral surface of the ink source roller 1 corresponding to these image areas (first Refer to FIG. 9, but 31b is not shown, and the same applies to the following).
As shown by the solid line in the figure, elastic displacement is performed so that the gap 1 formed between the tip of these doctor blades and the peripheral surface of the ink source roller 1 is the peripheral surface of the ink source roller 1 and the roller 4 immediately downstream thereof. Of the doctor blades 31 and 3 other than the doctor blades 31a and 31b.
For the tip of 1,31 ..., operate the adjusting bolt 32 to
As shown by the two-dot chain line in FIG. 8, elastic displacement is performed, and a gap 1 formed between these doctor blade tips and the peripheral surface of the ink source roller 1 is the peripheral surface of the ink source roller 1 and its surroundings. It is made sufficiently smaller than the gap L with the peripheral surface of the roller 4 located immediately downstream.

When the rotary printing press is operated under the above conditions, the ink source roller 1 is rotated via the transmission portion 15, the ink 3 in the ink fountain 2 is led out to the peripheral surface of the roller 1 as an ink film, and each divided doctor blade Until just before. By the way, in the two divided doctor blades 31a and 31b corresponding to the image parts a and b, the gap 1 between the tip portion and the peripheral surface of the ink source roller 1 is set to the peripheral surface of the ink source roller 1 and the peripheral surface thereof. Since it is set to be larger than the gap L with the roller 4 located immediately downstream, that is, l> L, an ink film having a thickness corresponding to that is formed and reaches the gap L, and as described above, l> To be L,
The ink film is transferred to the peripheral surface of the roller 4 immediately downstream. However, in the other divided doctor blades 31, 31, 31, ... Except for the two divided doctor blades 31a and 31b corresponding to the image portions a and b, the relationship between the gaps of both is 1 <.
Since it is set to L, the ink film reaching the gap L does not adhere to the peripheral surface of the roller 4 immediately downstream, so that no transfer occurs and the ink supply is cut off. Thus, while the ink is supplied to the image areas a and b in the plate of the plate motion 6, the ink is not supplied to the non-image area.

In the case of an offset rotary printing press, a dampening water supply mechanism 7
In that case, the configuration and operation in that case are the same as those of the above-mentioned one embodiment.

The present invention is not limited to the above-described embodiments, but includes any design modifications without departing from the technical idea described in the claims.

〔The invention's effect〕

As described in detail above, the present invention is provided with a mechanism for individually stopping the rotation of a large number of divided roller portions formed by dividing the ink source roller in the axial direction, or in the circumferential surface axial direction of the ink source roller. Due to a large number of divided doctor mechanisms installed side by side, the thickness of the ink film on the peripheral surface of the ink source roller is
Since the gap can be controlled to be smaller than the gap L between the peripheral surface of the ink source roller and the peripheral surface of the roller immediately downstream thereof, the transfer of ink to the peripheral surface of the roller immediately downstream can be classified. It became impossible to cut off the ink supply to the printing plate of the plate cylinder in a segmented manner.

When the ink control means is operated corresponding to the non-image area on the plate of the plate cylinder, the ink supply to the non-image area is interrupted and the ink is supplied only to the image area. Is done.

In the case of an offset rotary printing press, if the dampening water supply control means is also operated in association with the ink control means, the dampening water is supplied at the same time as the ink supply to the non-image area is cut off. Since it can be blocked, it is possible to prevent dampening water from entering the inking device through the non-image area. Thus, the total amount of dampening water that enters the inking unit via the plate surface can be minimized,
In particular, in an inking device with a shortened ink supply path, it is possible to prevent a situation in which an ink supply failure occurs due to penetration of dampening water and to continue stable printing operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a vertical sectional side view of an ink source roller 1 in FIG. 1, and FIG. -A cross-sectional plan view taken along the line X, Fig. 4 is a perspective view showing an essential part of the dampening water supply mechanism 7 in Fig. 1, and Figs. 5 and 6 are all water sources in Fig. 4. FIG. 5 is a vertical sectional side view of the roller 71, of which FIG. 5 shows a state in which the water supply is permitted, and FIG. 6 shows a state in which the water supply is cut off. 7 is a perspective view showing another embodiment of the present invention, FIG. 8 is a vertical sectional side view of the ink source roller 1 in FIG. 7, and FIG. 9 is a plan view of FIG. 1 ... Ink source roller (fountain roller), 2 ... Ink fountain, 3 ... Ink, 4 ... Immediately downstream roller (mesh roller, metering roller), 4a ... Doctor blade attached to immediately downstream roller , 5 and 5a ... Inking roller, 6 ... plate cylinder, 7 ... dampening water supply mechanism, 8 ... blanket cylinder, 8a ... other blanket cylinder or impression cylinder, 9 ... web, L ... Gap between the peripheral surface of the ink source roller 1 and the peripheral surface of the roller 4 immediately downstream thereof, 10,10,10 ...... Split roller portion of the ink source roller 1, 11 ...... These drive shafts, 12,12 , 12 …… electromagnetic clutch, 13 …… slip ring mechanism, 14 …… operating part, 15 …… transmission part, 16 …… frame, 20 …… individual rotation stop mechanism of split roller part, 21 …… its axis, 22,22,22 …… Eccentric roller, A … Rotation direction of eccentric rollers a and b …… image area, 10a …… divided roller portion corresponding to image area a, 10b …… divided roller portion corresponding to image area b, 22a …… image Rotation stop eccentric roller corresponding to the line portion a, 22b ... Rotation stop eccentric roller corresponding to the image portion b, 30 ... split doctor mechanism provided on the ink source roller 1, 31, 31, 31 ... split Doctor blade, 31a …… Divided doctor blade corresponding to image area a, 32,32,32 …… Adjustment bolt, 33 …… Mounting stay, l …… Formed between the peripheral surface of the ink source roller and the tip of the divided doctor blade Gap, 71 …… Water source roller, 72 …… Water tank, 73,73,73 …… Water supply cutoff blade, 73a …… Water supply cutoff blade corresponding to the area a, 73b …… Image A blade for cutting off the supply of water corresponding to the line b, 74 ... Brush roller, 75 ... Dampening water.

Claims (3)

[Claims] 1. A plurality of divided roller portions formed by dividing an ink source roller in the axial direction, and a rotation stop mechanism capable of coming into contact with and separating from the peripheral surface of each of the divided roller portions individually are provided. For each width of the division so that the thickness of the ink film supplied to the peripheral surface of the ink source roller is smaller than the gap between the peripheral surface of the ink source roller and the peripheral surface of the roller immediately downstream thereof. An ink supply interrupting device characterized by being individually controllable. 2. An ink source roller, which are arranged side by side in the axial direction of the peripheral surface of the ink source roller, and
A large number of divided doctor mechanisms that can individually adjust contact and separation with respect to the peripheral surface of the ink source roller are provided, and the thickness of the ink film supplied to the peripheral surface of the ink source roller is An ink supply interrupting device that can be individually controlled for each width of the division so that the gap is smaller than the gap between the peripheral surface and the peripheral surface of the roller immediately downstream thereof. 3. A water source roller and a water source roller are arranged side by side in the axial direction of the peripheral surface of the water source roller, and are divided so that they can be individually brought into contact with and separated from the peripheral surface of the water source roller. , A number of dividing blade mechanisms whose division widths are set corresponding to the division widths of the division roller section or the division doctor mechanism, and the water supply in relation to the position of the individual ink supply interruption. The ink supply interrupting device according to claim 1 or 2, further comprising dampening water supply control means capable of individually controlling the ink.