JPH01210345A - Rolling roller for printer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention provides a method for printing with uniform ink density in the axial direction by uniformly supplying ink in the axial direction to the inking roller of a printing press. Relating to a printing ink supply device rolling roller.

<Prior Art> In general printing presses, the coverage ratio of the pattern is generally different in the axial direction. In this case, the amount of ink differs in the axial direction accordingly, resulting in a difference in the amount of ink remaining on the inking roller. In this case, ink density difference (
ghost) may occur.

For this reason, in the ink supply mechanism of conventional printing presses, the fifth
As shown in the figure, the ink mixing roller 11 is brought into contact with the inking roller 8 that supplies ink to the printing plate 10, and by moving from side to side, the ink on the inking roller 8 is evenly distributed in the axial direction. I am trying to do. The ink mixing roller 11 has a fixed roller shaft,
It consists of a freely rotatable roll-over section. The rollover part and the shaft roller are provided with cams that engage with each other, and the rollover part moves left and right according to the guide of the cam. However, in this case, only one movement can be performed per revolution, and the rolling width is limited to a range that can be guided by the cam.

<Problems to be Solved by the Invention> In the above example, when the pattern of the printed matter, the ink characteristics, the rotational speed of the printing press, and the ink characteristics change, the amount of ink is changed for each part in the axial direction. They become different and need to be readjusted. In some cases, conventional ink mixing rollers alone cannot handle the situation.

<Means for solving the problem> In order to achieve the above problem, instead of an ink mixing roller,
Or, together with the inking roller, a rolling roller comprising a rolling part 2 equipped with a permanent magnet that vibrates and rotates horizontally without contacting the inking roller, and a roller shaft equipped with an electromagnet at a position where an electromagnetic force acts on the permanent magnet. use.

<Function> In the configuration of the rolling roller of a printing press of the present invention, when a periodic current is passed through the electromagnet, the period and phase of the current are changed, thereby making it possible to adjust the speed and direction of movement. It is now possible to arbitrarily adjust the speed and swing width of the rolling roller to suit the situation.

<Example 1> Hereinafter, one example of the present invention will be described in detail with reference to the drawings.

The rolling roller 1 for a printing press of the present invention consists of a rolling part 2 and a roller shaft 3, and is freely rotated by a hair ring 7 between them. A permanent magnet 4 is provided inside the rolling roller 1, and an electromagnet 5 wired from a terminal 6 is provided to the roller shaft 3. This □electromagnet 5
are arranged in pairs in the axial direction, and both of them are provided approximately within the movable range of the permanent magnet 4.

This actual operation will be explained below.

If the permanent magnet 4 has the same polarity as the electromagnet 5, a repulsive force will act, and if the permanent magnet 4 has different polarities, an attractive force will act. In this case, since the rolling portion 2 has a degree of freedom only in the axial direction, a force acts to move the permanent magnet 4 from the position of the electromagnet 5 of the same polarity to the position of the electromagnet 5 of a different polarity. In addition, this force becomes stronger or weaker (becomes weaker) depending on the current value of the electromagnet 5. This horizontal axis roller 1 needs to be periodically shaken from side to side, but for this reason, the direction of the current of the electromagnet 5 is It is good to change it periodically.In order to make this swing cycle faster, it is better to make the current cycle faster, and to adjust the swing width, it is better to adjust the current value.Please note that this power supply may be an AC power supply, or may be a square wave or a pulse wave.

Therefore, it is possible to adjust the lateral swing phase of the rolling section 2 with respect to the roller shaft 3, and to uniformly spread the ink film on the inking roller 8, which is deviated with respect to the axial direction. Therefore, even if the rotational speed of the printing press, printing ink, paper, etc. change, it is possible to equalize the ink supply to the printing plate 3 of the printing press and eliminate differences in ink shading that occur in the printing width direction of printed matter. becomes.

<Example 2> Hereinafter, an example of the present invention different from Example 1 will be described in detail with reference to FIG. 4.

This rolling roller 1 for a printing press consists of a rolling section 2 and a roller shaft 3, and is freely rotated by a bearing 7 between them. Inside the rolling roller l, there is a permanent magnet 4.
The roller shaft 3 is also provided with an electromagnet 5 wired from a terminal 6. The electromagnets 5 are arranged in pairs in the axial direction, and each of the electromagnets 5 is provided approximately within the movable range of the permanent magnet 4. The driving method is shown in Example 1.
It is similar to

<Effects of the Invention> As explained above, according to the present invention, an ink mixing roller is provided and the cycle and current value of the current flowing through the electromagnet are freely adjusted according to the printing conditions of the printing machine. Even when the rotational speed of the printing press changes, it is possible to equalize the ink supply to the printing plate and eliminate the difference in ink density that occurs in the printing width direction of the printed matter.

[Brief Description of the Drawings] Fig. 1 is a side view showing an embodiment of an ink mixing roller for a printing press according to the present invention, Fig. 2 is a front sectional view of the same, and Fig. 3 is a printing machine of the same embodiment. FIG. 4 is a side view showing an embodiment of the ink mixing roller for a printing press according to the present invention, and FIG. FIG. ■...Rolling roller 2...Rolling part 3...Roller shaft 4...Permanent magnet 5...Electromagnet 6...Terminal 7...Bearing 8...Inking roller 9... Blanket 10...Printing plate 11...Ink mixing roller 12...Impression cylinder 13...Printing paper patent application Toppan Printing Co., Ltd. Representative Kazuo Suzuki Figure 4

Claims (1)

[Claims] 1) A rolling part that contacts an inking roller used in a printing ink supply device and rotates while oscillating sideways and is equipped with a permanent magnet, and an electromagnet is fixed at a position where an electromagnetic force can be exerted on the permanent magnet. A rolling roller for printing presses characterized by consisting of a roller shaft.