JPS59129153A - Automatic controller for amount of water supplied in lithographic rotary press printer - Google Patents

Abstract

PURPOSE:An automatic controller capable of reducing the amount of damping water to be supplied to a plate cylinder to a necessary minimum extent and of permitting clear good-quality printing by using a system in which the amount of moisture in ink in an ink fountain is electrically measured and control is made on the increase or decrease of the amount of water to be supplied in the regulating portion of the water amount. CONSTITUTION:The electrode 18 of an electric moisture meter 17 is dipped in ink 9, and the moisture content is measured in the form of electrical numeral value and sent to the supplied water amount regulating portion of a water supply mechanism 4 for controlling. In a printing unit where the supply of water is limited, moisture in the ink sent by an ink supply system is consumed and the deficit of the water amount is supplemented. Various troubles with excessive supply of water can thus be completely prevented.

Description

Detailed Description of the Invention: a. Industrial Application Field The present invention is a method for automatically controlling the amount of dampening water supplied to a plate cylinder in a rotary printing press using a lithographic plate, including offset printing and direct printing. It relates to a device to be controlled.

b. Prior Art Since the conventional planographic printing unit is equipped with a large number of inking roll groups of over 10 fingers, there is no possibility that the dampening water supplied to the plate cylinder will flow back to the ink supply source. there were.

However, recently, as shown in FIG. 1, when a mesh roll (1i1J-named amiroll, screened roll mataha anilox roll) which can omit a large number of inking roll groups is introduced into a lithographic printing system, a first-order gap occurs. That is, (1) the excess dampening water supplied to the non-image area on the flat plate 3 of the plate cylinder 2 via the water supply mechanism 4 passes through the rolls 5 and 6 and is deposited on the mensch roll l. (2) Since the mesh roll surface is chromium-plated and is hydrophilic, the water flowing back drives away the ink on the mesh roll and prevents the ink from adhering to the roll. (3) Due to these reasons, the amount of ink reaching the printing paper surface is too small and clear printing is obstructed; (4) Backflow water flows from the mesh roll 1 via the fountain roll 7 into the ink fountain 8. It has been found that the water content in the ink increases with the passage of printing time, and when the water content reaches an area of 30 inches, for example, the ink density on the paper surface decreases rapidly. A solution was urgently needed.

In response to this, the applicant of this patent has previously proposed a method of treating the surface of the mensch roll 1 with a lipophilic substance to prevent water from adhering to the mesh as much as possible, thereby ensuring the supply of ink. 56-
No. 118969, No. 56-156028 and No. 56-
156029), a proposal to attach a scraper for return water removal to mesh roll 1 (Utility Application No. 56-14593)
No. 3), blade 11 in contact with water supply brush roll 10
Proposal to make classification adjustable (Utility Application No. 56-145935
No.), and a dehydration filter in the forced circulation system for water-containing ink.

Proposal to remove water by inserting a filter (proposed in 1977-145
No. 934).

C8 Object of the Invention In view of the above-mentioned needs, an object of the present invention is to automatically control the supply of dampening water to the plate cylinder of a planographic rotary printing unit to the minimum necessary range, thereby eliminating the dampening water caused by water. Eliminate the possibility of various harmful effects.

To create and provide a device that enables clear and high-quality planographic printing at all times.

d0 Structure of the Invention The structure of the present invention is to provide a means for electrically measuring the water content mixed into the ink in the fountain, and to send the measured value to the water supply amount adjustable part of the water supply mechanism to adjust the water supply amount. The point is to control the amount.

e. Examples The structure and operation of the present invention will be explained in detail below with reference to the drawings according to its specific embodiment.In the lithographic printing unit shown in FIG. water is supplied to the non-image areas.

The ink supply mechanism supplies ink 9 in the ink fountain 8.
After the ink is taken out by the rotation of the laundry roll 7 and transferred to the mesh roll 1, the excess ink is scraped off by the doctor blade 12, and only the ink within the mesh is transferred to the pair of ink deposits via rolls 5 and 6. It is supplied to the lithographic plate 3.

In the water supply machine 4'f4, the water 1-1 in the water boat 13 is bubbled out by the brush roll 10, turned into water droplets by the momentum of the flicker blade 11, and the water receiver is turned into water droplets by the brush roll 10.
5, the swimsuit is supplied to the lithography plate 3 via the roll 1G.

Part of the dampening water supplied to the non-image area of the lithographic plate 3 becomes surplus water, and the ink deposit is transmitted to the rolls 5 and 6 and transferred to the mensch roll 1, and a part of it enters the mesh. The adhesion of the ink is inhibited, and the other part is mixed into the ink 9 in the ink alanthane 8 via the doctor blade 12 or the 7-aunten roll 7.

Therefore, in the present invention, an electric moisture meter 17 is provided.

The electrode or sensor portion 18 is immersed in the ink 9. Incidentally, although the ink 90 level drops with use, it is always replenished to a constant level of 2 by known means.

The electric moisture meter 17 measures the moisture content in electrical values by utilizing the fact that the electrical characteristics of the ink 9 change depending on the moisture content.

The electrical properties of the ink 90 that change depending on the water content are the electrical conductivity expressed as the resistance value or its reciprocal, or the electrical properties of the ink 90 that change depending on the water content.
It can be extracted as the capacitance of or the dielectric constant derived from it.

The electrically measured value of the water content obtained by the above-mentioned measuring means is sent to the water supply amount adjustable system of the water supply mechanism 4 to control it.

There are various systems that can adjust the amount of water supplied.
Illustrated in the diagram.

As shown in FIGS. 1 and 2 (A), when the water supply mechanism is of the brush roll type, there are two water supply amount adjustable systems.

The first step is to change the speed of the rotation of the drive motor 19 of the brush roll 10, and the speed control is performed by inputting an electrically measured value of the moisture content to the motor speed control section 20. The speed of the brush roll motor 19 is controlled in relation to the rotational speed of the rotary press.

So (7) 2 Ha, shoot the brush of B Rashiror 10<
The amount of water supplied can also be controlled by adjusting the thrust of the flicker blade 11.

In the case of the brush roll method, an independent water supply machine 4i1 for the lithographic plate 3! : An individual system (see FIG. 1) having a water supply mechanism and a mixed system (see FIG. 2) in which the ink deposition mechanism is attached subordinate to the roll 5 are well known. However, it is possible to equip it.

As shown in FIG. 2(B), when the water supply mechanism is of the Flambro roll type, the measured value of the water content is input to the speed control section of the drive motor (not shown) of the flap roll 21.

As shown in FIG. 2(0), when the water supply mechanism is of the 7-list type, the measured value of the water content is input to the speed control section of the drive motor (not shown) of the water base roll 22.

As shown in FIG. 2(D), when the water supply mechanism is of the Smith type, the opening and closing of the pulp in the spray nozzle 23 is controlled based on the measured water content.

As shown in FIG. 2(E), when the water supply mechanism is of the oscillating roll type, the number of swings of the arm of the oscillating roll 24 is controlled depending on the measured value of the water content.

In this way, the amount of water supplied to the printing plate 3 is automatically controlled based on the measured water content of the ink, and the control 17) - For example,
Figure 3 is shown.

In FIG. 3, the moisture content of the ink in the ink fountain 8 is initially O value, and as printing progresses, the moisture content increases, and when the moisture content reaches X value, for example, the present invention is applied. The control system is activated and the water supply adjustable system is automatically controlled to reduce the water supply amount.

A printing unit with limited water supply consumes water mixed in the ink conveyed by the ink supply system to compensate for the lack of water.

If the water content of the ink in the ink fountain 8 drops to, for example, the Y value due to the effect of the water supply restriction, there is a risk of water shortage, so the water supply adjustable system is returned to the starting state.

Then, the moisture content of the ink in the ink fountain 8 increases again and eventually reaches the Y value.

The above action is repeated and the water supply system is automatically controlled.

f3 Effects of the Invention As can be seen from the above explanation of the structure and operation, in the present invention, the moisture content of the ink in the ink fountain 8 is electrically measured, and the water supply system is automatically controlled based on the measured value, so that lithographic printing Although it has recently become possible to prevent various problems caused by an oversupply of water,
Even if water backflows into the simple inking system using the mesh roll 1, it is now possible to automatically control the problem before it appears to the outside, so there are great printing benefits.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram illustrating a specific embodiment of a lithographic printing unit equipped with the apparatus of the present invention. FIG. 2 is an explanatory diagram illustrating each aspect of the water supply amount adjustable system. Figure 3 shows the amount of water supplied to the printing plate and the printing time.5! , is a diagram illustrating a series of nodes. 1... Metsch roll, 2... Plate cylinder, 3... Plano plate, 4... Water supply mechanism, 5 and 6... Ink shoulder roll, 7... Nooranten roll, 8... Ink Fountain, 9... Ink, 10.
...Brush roll, 11...Blade, 12...Doctor blade, 13...Mizifune, engineering 4...Water, 15
...The water receiver is a roll, '16...The swimsuit is a roll, 17
...Electrical moisture meter, 18. Part of its electrode or sensor, 19. Brush roll drive motor, 20. Motor speed control section, 21. Flap roll, 22. Water source. Roll, 23...Spray nozzle, -
24...Roll the neck. Patent Applicant: Tokyo Kikai Seisakusho Co., Ltd., Patent Attorney, Sanne Mamoru Procedural Amendment (Voluntary) February 2411, 1982 Commissioner of the Japan Patent Office Kazuo Wakasugi 1 Indication of Case 1981 Patent Application No. O 64876 2 Name of the Invention Relationship with the case of a person who corrects water supply amount automatic control device 3 in a lithographic rotary printing press Patent applicant Address (Residence) Name Tokyo Kikai Seisakusho Co., Ltd. 4, Agent (249) 1-1 Sakurayama, Zushi City 19 phone (0468)
γ1-28725 Date of correction order Showa year
Amendment 1 to the specification, page 4, line 11 of the specification, "There were none."
There were hardly any. ” he corrected. 2. Insert ", Norris method, Smith method, etc." after "method" on page 9, line 11. 3. On the 10th page, line 10, insert ``Contact time with water base roll'' next to ``Number of oscillations''.

Claims (9)

[Claims] (1) An electrical moisture content measurement means that measures the amount of moisture mixed in ink by utilizing the fact that the electrical characteristics of ink in an ink fountain permanently installed in a rotary lithographic printing unit change when the ink becomes hydrated. An automatic water supply amount control device for a lithographic rotary printing press, comprising: and a water supply amount control means that sends an electrical measurement value obtained from the measuring means to a water supply view adjustable system of a water supply mechanism to adjust the water supply amount. (2) The device according to claim 1, which utilizes changes in the resistance value of the ink or its reciprocal conductivity as means for measuring the water content in the ink. (3) -1 The device according to claim 1, which utilizes a change in the capacitance of the ink or a change in the dielectric constant derived from the capacitance of the ink as a means for measuring the water content in the ink. (4) The device according to claim 1, wherein when the water supply mechanism is a brush roll type, the amount of water supplied is controlled by changing the speed of the brush roll drive motor based on the measured value of water content. (5) When the water supply mechanism is a brush roll type, the device according to claim 1, wherein the water supply amount is controlled by adjusting the amount of thrust of the blade toward the brush roll based on the measured water content value. (6) The device according to claim 1, wherein when the water supply mechanism is a flap roll type, the amount of water supply is controlled by changing the speed of the flap roll drive motor based on the measured value of water content. (7) The apparatus according to claim 1, wherein when the water supply mechanism is a Norris type, the water supply amount is controlled by changing the speed of the water source roll drive motor based on the measured value of the water content. (8) The device according to claim 1, wherein when the water supply mechanism is of the Smith type, the water supply amount is controlled by opening and closing the pulp of the spray nozzle based on the measured value of the water content. (9) The device according to claim 1, wherein when the water supply mechanism is a neck roll type, the amount of water supply is controlled by adjusting the number of swings of the arm of the swinging roll based on the measured value of the water content.