JPH01208137A - Ink distributing roller for printing press - Google Patents

Abstract

PURPOSE:To adjust a lateral turning roller to an appropriate oscillation speed and oscillation width and to uniformly supply ink to the printing plate of a printing press, by providing a linear motor to the lateral turning roller laterally oscillating and rotating in the state brought into contact with a form roller. CONSTITUTION:A linear motor is provided to a lateral turning roller 7 laterally oscillating and rotating in the state brought into contact with a form roller 1. By making the cycle and phase of the pulse current supplied to the linear motor variable according to a printing state, the moving speed and moving direction of the linear motor can be changed and, by this method, the lateral turning roller 7 can be independently adjusted to an appropriate oscillation speed and oscillation direction. Therefore, even when the rotational speed (printing speed) of a printing press is changed, the supply of ink to the printing plate of the printing press is uniformized and the density difference of the ink generated in the printing width direction of printed matter can be removed.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a printing ink supply device for uniformly supplying ink to a printing press. This invention relates to an ink mixing roller for a printing press equipped with a linear motor.

[Prior Art] In general, in a printing press, when the amount of ink supplied in the roller rotation direction is clearly different in the printing width direction (roller axial direction), the difference in ink film thickness in the printing width direction is used as is for printing. This appears as a difference in the amount of ink supplied to the plate, and ink adhesion is caused by the amount of ink remaining on the roller being supplied to the printing plate while being deviated according to the non-printing area. , especially ink density differences in solid density print areas (this is usually called a ghost phenomenon)
occurs.

By the way, as shown in FIG. 4, the ink supply in a conventional printing press involves an operating mechanism in which the rolling roller 2 is not brought into contact with the ink-directing roller 1, but is rotated in a yellow direction, and the ink is supplied uniformly to the printing plate 3. is provided. However, this type of operating mechanism cannot be expected to have the effect of eliminating the above-mentioned difference in ink density. Furthermore, the rolling roller 2 in this type of operating machine (t) does not have a function to independently adjust the swing speed and swing width regardless of the rotation speed (printing speed) of the printing machine, and the swing width is constant and periodic. It also depends on the rotation of the printing press. In the figure, 4 is a blanket, 5 is an impression cylinder, and 6 is a printing paper.

[Problems to be Solved by the Invention] Therefore, when the rotational speed of the printing press changes, it becomes impossible to uniformly supply ink to the printing plate 3 of the printing press.

The present invention was made to solve the above-mentioned problems, and even when the rotational speed of the printing press changes, the ink supply to the printing plate of the printing press is made uniform, and the ink generated in the printing width direction of the printed matter is prevented. An object of the present invention is to provide an ink mixing roller for a printing press capable of removing differences in shading of ink.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an ink kneading roller used in a printing ink supply device for supplying ink to a printing press so that the ink deposit does not come into contact with the roller. A linear motor is provided on a horizontal rolling roller that rotates horizontally, and the period and phase of the pulse current applied to the linear motor are varied depending on the printing state of the printing machine.

[Operations] Accordingly, in the ink mixing roller for a printing press of the present invention, the moving speed and moving direction can be adjusted by varying the period and phase of the pulse current applied to the linear motor provided in the rolling roller depending on the printing condition. changes, making it possible to adjust the rolling roller to an appropriate swing speed and swing width.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a side view showing a printing ink supply device to which the ink mixing roller for printing presses of the present invention is applied. The same parts as in FIG. Only the different parts will be described. That is, in FIG. 3, an ink mixing roller for a printing press is constructed by providing a rolling roller 7 that rolls on its side without contacting the ink covering roller 1, and further providing a linear motor on this rolling roller 7.

Figures 1(a) and 1(b) show the ink mixing roller for the same printing machine! 74 is a side view and a front sectional view showing an example. In FIGS. 1(a) and 1(b), the rolling roller 7 freely rotates with respect to the roller shaft 8 by means of a bearing 9 therebetween. Inside this rolling roller 7, a toothed core 10 serving as a zero mover is provided, and a gap is provided between this toothed core 10 and the roller shaft 8.

Further, the shaft portion is provided with a permanent magnet 11 serving as a stator and a magnetic pole core 12, and current-carrying coils 13A and 13B are wound around the magnetic pole core 12 as shown. Note that 14 is a terminal for power supply led out from each coil 13A, 13B.

In the ink mixing roller for a printing press having such a configuration,
Coil 13A wound around magnetic pole iron core 12.

An electromagnetic flux is obtained by passing a pulse current through the terminal 13B, and the interaction between this electromagnetic flux and the bias magnetic flux generated within the gap generates a large and small attractive force within the gap.

This operating principle will be explained below using the conceptual diagrams shown in FIGS. 2(a) to 2(d).

Now, the bias magnetic flux generated by the permanent magnet 11 (
Dta, coils 13A, 13A, 13B.

Let Φe be the electromagnetic flux generated by 13B. Figure 2 (
In a), when a pulse current is applied to the coils 13B and 1300, Φm+Φe occurs in the magnetic pole core B, and a strong attractive force acts so that the teeth at the illustrated positions oppose each other, but in the magnetic pole core B, the direction is canceled out. In addition, for magnetic pole cores A and A, Φ
m is divided into two.

Next, in FIG. 2(b), by applying a pulse current to the coils 13A, 13A, the magnetic pole core B receives Φts+c.
pe, and by the same action 1 as shown in FIG. 2(a), the magnetic pole core A becomes ΦI+ΦC, and the teeth of the magnetic pole core A face the teeth of the white-toothed core 10. In Figures (a) and (b), with respect to the tooth pitch P of the toothed core 10, as shown,
This means that the toothed core 10, which is the mover, has moved by 1/4P.

Next, the toothed core 10, which is the mover, moves by 1/4P in FIGS. 2(b) and (C), and by 1/4P in FIGS. 2(C) and (d), respectively. Therefore, Fig. 2(a)~
In the four modes of (d), the toothed core 10, which is the mover, moves by the tooth pitch P. On the other hand, the coil (A
, A) phase and coil (B, 100) phase are electrically at the 90' position, indicating a two-phase state. Therefore, the moving distance itl! (step-to-tub distance M) of the 4 m-shaped core 10 corresponding to one pulse current input is determined by the tooth pitch P of the toothed core 10.

As described above, in the ink mixing roller for a printing press of this embodiment, the moving speed and movement of the ink mixing roller for a printing press can be controlled by varying the period and phase of the pulse current applied to the linear motor provided in the rolling roller 7 according to the printing condition. The direction can be changed, and thereby the rolling roller 7 can be independently adjusted to an appropriate swing speed and swing width.

Therefore, by adjusting the swing phase of the rolling roller 7 with respect to the roller shaft 8, it becomes possible to uniformly spread the ink film that is offset in the width direction (axial direction) on the roller 1. , If the swing width of the rolling roller 7 is further expanded, the ink film advances in the direction of expansion,
Also by making one yellowing period of the rolling roller 7 relatively short with respect to the rotation period of the printing plate 3, it is possible to further equalize the ink film in the width direction and the rotation direction. Therefore, even if the rotational speed (printing speed) of the printing press changes, it is possible to equalize the ink supply to the printing plate 3 of the printing press and eliminate the difference in ink density that occurs in the printing width direction of printed matter. Become.

Here, the printing conditions when varying the period and phase of the pulse current applied to the linear motor include, for example, unbalance of printing shading, amount of ink required per unit area, rotation speed (printing speed), and ink flow. Possible factors include viscosity.

[Effects of the Invention] As explained above, according to the present invention, the ink stone is constructed by providing a linear motor on the horizontally rotating roller that rotates horizontally without contacting the roller, and the linear motor changes depending on the printing state of the printing machine. Since the period and phase of the pulse current applied to the printing machine are made variable, even if the rotational speed of the printing machine changes, the ink supply to the printing plate of the printing machine is made uniform, and the ink generated in the printing width direction of the printed matter is reduced. It is possible to provide an ink mixing roller for a printing press that can eliminate the difference in shading.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a side view and a front sectional view showing an embodiment of an ink mixing roller for a printing press according to the present invention, and FIGS. 2(a) to 2(d) illustrate the operating principle of the same embodiment. FIG. 3 is a side view showing a printing ink supply device to which the ink mixing roller for a printing press of the same embodiment is applied, and FIG. 4 is a side view showing a conventional printing ink supply device. 1... Ink deposition is done by roller, 2... Rolling roller,
3...Printing plate, 4...Blanket, 5...Pressure l
116...Printing paper, 7...Rolling roller, 8...
Roller shaft, 9... Bearing, 10... Toothed iron core, 11... Permanent magnet, 12... Magnetic pole iron core, 13A
, 13B...Coil, 14...Terminal. Applicant's agent Patent attorney Takehiko Suzue 6m (a) (b) (c) Figure 2, 3rd UI! J Figure 4

Claims (1)

[Claims] In an ink mixing roller used in a printing ink supply device for supplying ink to a printing press, the rolling roller rotates laterally while contacting an ink form roller, and is provided with a linear motor. 1. An ink mixing roller for a printing press, characterized in that the period and phase of the pulse current applied to the linear motor are varied depending on the printing state.