JPS59159350A - Automatic ink replenishing apparatus - Google Patents

Abstract

PURPOSE:To make it possible to enhance reliability, in an automatic ink replenishing apparatus for replenishing ink to the ink sump of a printing press, by detecting only the lower level of the ink to reduce the error thereof while intermittently performing the supply of high viscosity ink by a quantitative supply means. CONSTITUTION:The lower limit L of the ink amount in an ink sump 1 is detected by a level sensor due to air pressure, ultrasonic waves or light and, when the detection signal thereof continues for a time exceeding the set time of a timer 8, it is judged that a temporary recessed part generated by stirring high viscosity ink showing structural viscosity is not detected and the solenoid 10 of an ink quantitative supply means 9 is opened for a predetermined constant time required in raising an ink level from L to Lu to supply the ink under constant pressure. By this mechanism, the upper limit of the ink level is indirectly set to enable the automatic replenishment of the ink with reliability and the ink can be stably supplied to an ink cylinder through a fountain roller 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for automatically replenishing ink into an ink layer.

Conventionally, for low viscosity ink such as gravure ink, level sensors are provided at the lower and upper limits.

It has been possible to control the amount of ink in the ink layer relatively easily by providing a simple float valve. However, in the case of lithographic printing ink having high viscosity and structural viscosity, it is difficult to apply the above method as is because the ink surface (liquid surface) is difficult to become horizontal.

Also, when rotating at high speeds like newspaper printing.

In particular, the amount of ink supplied varies depending on the contact area between the ink in the ink layer and the fan tin roller, which may affect printing density and result in a large amount of wasted paper. In order to prevent such accidents, the current situation is that workers must constantly monitor the work.

The current situation will be explained in detail below with reference to the drawings.

Fig. 1 is a schematic diagram of an ink supply device using an ink fountain system, in which ink that has partially adhered to a fan roller (2) rotating in an ink reservoir (1) is removed by a doctor knife (3) into an appropriate ink supply device. The ink is supplied to the ink cylinder (6) via several transfer rollers (4), (5), etc. (arrows in the figure below indicate the rotation direction).

Fig. 2 is a partially enlarged view of Fig. 1. In Fig. 1, 1.0 indicates the level of line contact between the ink surface and the fan tin roller (2), and Ll and Lu are the lower limits to be controlled. Shows ink level and one-time ink level.

Figure 3 (This is a graph qualitatively showing the relationship between the ink level and the ink supply amount in high-speed printing. From Figure 32, it is understood that the higher the ink l/bel, the more stable the ink supply amount becomes. be done.

However, it is obvious that if the ink level is too high, the ink will overflow from the ink reservoir (1).

Certain upper limit level 1. It is understood that the lower limit level I7ρ must be set to 1- or less than the level at which the ink supply amount is stabilized.

According to research by the present inventors, in newspaper reprint printing, ■71-1. j! #12 fin, and on the other hand, the error when detecting the lower limit level of this ink with a level sensor is about 2 to 4
It is a dragon, and the error when detecting the upper limit level is about 10m.
It is m. Therefore, if two level sensors are attached to the upper and lower limits of C1, the error will be so large that no reliability will be obtained.

In view of the above-mentioned current situation, the present inventors have conducted intensive research to develop a reliable and relatively simple automatic replenishment device for high viscosity ink, and as a result, have arrived at the present invention.

As shown in FIG. 4, the present invention includes means (7) for detecting that the amount of ink in the ink reservoir (1) has fallen below the lower limits (2) and (r) and sending a signal, and a unit (7) that operates in response to the signal. -7-(8
) and an intermittent quantitative ink supply means (9) that operates upon receiving a signal from the timer (8), and when the timer (8) operates continuously for a predetermined period of time. A signal is sent to the ink quantitative supply means (9) to perform operation I.
l! The present invention relates to an apparatus for automatically replenishing high viscosity ink into an ink layer, which is characterized by a high viscosity ink layer.

In the present invention, the amount of ink in the ink reservoir (1) is the lower limit
, 7! Means for detecting the following and sending a signal (7)
In addition to the air pressure level sensor shown in FIG. 4, it is also possible to replace the sensor with a level sensor with less error, such as an ultrasonic level sensor or an optical level sensor. It is also important that the timer (8), which operates in response to signals from these sensors (7), sends a signal to the ink quantitative supply means (9) to activate it when the timer (8) operates continuously for a predetermined period of time. be. As mentioned above, ink with a high viscosity and a structural viscosity of 1t1" has difficulty in making the ink surface level. When the ink surface is temporarily generated due to stirring of the ink, a signal is immediately sent to the ink quantitative supply means (9). If the ink is activated, the ink will be supplied to the limit of 2, and the ink will be supplied to more than ρ, leading to an accident that the ink reservoir (1) will overflow.
) is limited to ■, 7! Above, upper limit 1. Any material that can supply ink of u or less may be used. for example,
Possible means include receiving a signal to open the solenoid valve (10) and supplying ink under a constant pressure for a fixed period of time, or using a metering pump.

As described below, in the apparatus according to the present invention, when the level of high viscosity ink decreases, the ink direction is kept relatively horizontal, and when high viscosity ink is supplied, water on the ink surface 1) i
7) The level sensor detects only the lower limit level of 17N to reduce errors, and the ink quantitative supply means (9), which operates intermittently, is used to supply high viscosity ink. ), the upper limit of the ink level L u
is set indirectly, making reliable automatic replenishment possible.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of an ink supply device using an ink fountain system, Figure 2 is a partially enlarged view of Figure 1, and Figure 3 qualitatively shows the relationship between ink level, ink supply amount, and 5- in high-speed printing. The graph and FIG. 4 are schematic diagrams showing the automatic ink replenishing device according to the present invention, and the main symbols l in FIG.
J is as follows. 1- Ink reservoir, 2- Fantine roller. 3- Doctor knife. 7-Means for detecting that the amount of ink is below the lower limit Ll and sending a signal. 8-=timer. 9-Discrete ink metering supply means. Patent issuer Mjin Co., Ltd. Naka E1 Shinmasha Toyo Ink Manufacturing Co., Ltd. -6 = Senn-mura No. 31 L LILu Ayq Reheluo qω

Claims (1)

[Claims] 1. A means for detecting that the amount of ink in the ink layer is below the lower limit and sending a signal; a timer that operates in response to the signal; and an intermittent ink metering device that operates in response to the signal from the timer. and a supply means for automatically supplying high viscosity ink into an ink layer, characterized in that when the timer indicated in l-1 continuously operates for a predetermined time, a signal is sent to the ink fixed quantity supply means to cause it to operate. equipment to replenish.