JPH07108566B2 - Ink amount signal generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention detects an ink remaining amount in an ink fountain of a printing machine and generates an alarm signal when the remaining ink amount falls below a certain value. It is about.

[Prior Art] In general, the ink used in a printing machine becomes too soft when the amount of ink in the ink fountain decreases and the ink in the fountain changes due to the ink fountain roller kneading the ink. Then, since the ink supply amount changes, it is required that a certain amount or more is in the ink fountain. For this reason, conventionally, a detector has been proposed which detects the amount of ink by detecting the remaining amount of ink from a change in electrostatic capacity.

[Problems to be solved by the invention]

However, since such a conventional device detects the sensor by bringing it close to the ink surface, it becomes a nuisance when cleaning the ink fountain, the workability deteriorates, and the ink is mixed by the rotation of the ink fountain roller during printing. As a result, the ink plane does not become flat and the ink level detection becomes unstable.

[Means for solving problems]

In order to solve such a problem, the present invention indirectly detects the amount of ink.

[Work]

The ink consumption is calculated from the number of revolutions of the printing machine, the ink feed amount, and the opening amount of the ink fountain key, and the previously calculated calculation value is subtracted from the ink amount before the start of printing.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention.
In the figure, 1 is the ink amount I ₀ in the ink fountain before the start of printing.
An initial value setting device for setting 2 is a rotation amount detector for detecting the rotation speed n of the printing machine from a rotating body that rotates once every time one printing is performed like a plate cylinder, and 3 is an ink feed amount. An ink feed amount detector for detecting m, 4 is an ink fountain key opening amount detector for detecting an ink fountain key opening amount k, and 5 is an ink consumption coefficient f (k) calculated from the ink fountain key opening amount k. ink consumption coefficient calculator 6 is alive consumption computing unit, 7 is a subtractor for calculating the ink remaining amount based on the following formula, comparator 8 which generates an output when ink and has fallen below the minimum required amount I _L , 9 are ink minimum required amount setting devices for setting the ink minimum required amount I _L.

Ink with an ink film thickness of 2 to 5 μm is supplied to the printing paper surface, but the mechanism of printing is that there is an ink film of about 6 to 12 μm on the inking roller, and the amount of ink on the pattern on the plate Only the ink is replenished from the upstream side of the inking roller, and the ink replenished there is replenished from the upstream side, so that the consumed ink is replenished from the upstream side (ink Not all the ink supplied from the urn is finally transferred to the paper, and the ink does not flow unless it is consumed even if supplied.) From these mechanisms, the following relationships are established.

Ink film thickness on ink fountain roller> Ink film thickness on ink fountain roller (1) Therefore, the ink consumption amount has a relationship as shown in Fig. 2 as the opening amount k of the ink fountain key. If the opening amount k of the ink fountain key opening amount detector 4 is detected, the ink consumption coefficient f (k) can be obtained by the ink consumption coefficient calculator 5 based on the characteristics of FIG.

On the other hand, the ink feed amount is substantially proportional to the ink consumption amount, and the printing machine rotation speed is also proportional to the ink consumption amount. From this fact, the remaining ink amount I in the ink fountain is obtained by the following equation.

_{I = I 0 -n · m ·} f (k) ...... (2) When the ink remaining amount falls below the set ink regeneration required amount I _L of the ink amount small required amount setter, comparator 8 that the And a warning signal is issued.

By applying this device and comparing and displaying the amount of ink and the remaining amount of ink required to finish printing,
If the operator replenishes only the required amount of ink, the ink consumption can be economically managed.

〔The invention's effect〕

As described above, according to the present invention, the remaining ink amount is indirectly detected. Therefore, the cleaning work of the ink tank is facilitated, and the remaining ink amount can be reliably detected even when the ink is running low during printing. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a graph showing characteristics of ink consumption. 1 ... Initial value detector, 2 ... Rotation amount detector, 3 ... Ink feed amount detector, 4 ... Ink fountain key opening amount detector, 5
…… Ink consumption coefficient calculator, 6 …… Ink consumption amount calculator, 7 …… Subtractor, 8 …… Comparator, 9 …… Minimum required ink amount setter.

Claims (1)

[Claims] 1. An initial value setting device for setting an ink amount I ₀ before starting printing in an ink fountain, a rotation amount detector for detecting a printing machine rotation speed n, and an ink for detecting an opening amount of an ink fountain key. An alarm signal is sent when the remaining ink amount is less than the required minimum ink amount by comparing the amount of remaining ink required based on the above specifications with a preset minimum ink amount An ink amount signal generator characterized by comprising a comparator for outputting.