JPH0798392B2 - Spot printing cylinder switching device for rotary printing press - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spot plate cylinder switching device in a rotary printing machine, which is applied when the surface of spot printing is freely switched between front and back.

[Conventional technology]

FIG. 7 and FIG. 8 are layout diagrams of a printing press roller for explaining a conventional technique. 01 is a printing press frame, 02,05 is a plate cylinder, 03,04 is a blanket cylinder, 06 is a spot plate cylinder, And 07 is a continuous paper.

In FIG. 7, the spot plate cylinder 06 is a blanket cylinder 04.
The continuous paper that is placed in pressure contact with the blanket cylinder 03 and maintains a gap S between it and the blanket cylinder 03, and is fed from below the printing machine.
On the B side of 07, the single color transferred from the single color plate cylinder 05 and the multicolor transferred from the spot plate cylinder 06 are printed by the blanket cylinder 04, and on the A side, the single color transferred from the single color plate cylinder 02, Printed by the blanket cylinder 03.

On the other hand, in the example of FIG. 8, the spot plate cylinder 06 is arranged in pressure contact with the blanket cylinder 03, and there is a gap S between the spot plate cylinder 04 and the blanket cylinder 04, and the surface to be spot printed is the A surface. The rotation directions of the cylinder 06 are opposite to each other in FIGS. 7 and 8.

In the above-mentioned conventional example, the position of the spot plate cylinder 06 is fixed. This is the supplementary printing of the printing unit of the rotary press. In the ink-printing unit, it is decided whether the supplementary printing (spot printing) will be put on the front side or the back side of the continuous paper when the specifications of the machine ordering side are decided. Sometimes it was fixed and fixed.

[Problems to be solved by the invention]

In the prior art, in any of those shown in FIG. 7 or FIG. 8, the position of the spot plate cylinder is fixed, and the spots are inserted only on the fixed surface of the continuous paper.

Therefore, paper making rich in variations (articles and advertisements)
I can't.

[Means for solving problems]

(1) The spot plate cylinder is made movable, and one of the two blanket cylinders is selectively moved and pressure-bonded so that a necessary gap is maintained between the blanket cylinder and the other blanket cylinder.

(2) In order to perform the operation in the preceding paragraph, the cylindrical bearing cylinder that supports both axial ends of the spot plate cylinder is fitted into the coaxial hole of the mechanical frame, and is rotated left and right in synchronization with the lever to form a cylindrical bearing cylinder. Move the spot plate body axis that is eccentric to the outer diameter circle of the body.

(3) Install a drive mechanism that switches between forward and reverse rotation of the spot plate cylinder in conjunction with the position operation of the spot plate cylinder.

[Work]

By switching the position of the spot plate cylinder, it is possible to arbitrarily perform supplementary printing (spot printing) on the A side or B side of the continuous paper.

Therefore, it is possible to make a paper surface rich in variety.

〔Example〕

1 to 6 are for explaining an embodiment of the present invention. FIG. 1 is a sectional view of an essential part of a spot plate cylinder, and FIG. 2 is an explanation showing a state in which the spot plate cylinder is switched to the right. 4 and 5 are explanatory views showing a state in which the spot plate cylinder is switched to the left, and FIG. 6 is an external view of a spot plate cylinder switching mechanism.

The configuration of the present invention will be described with reference to the drawings.

While the continuous paper 7 is held by the pair of blanket cylinders 3 and 4, monochrome printing is simultaneously performed on both surfaces thereof. Blanket torso
The spot plate cylinder 6 is disposed above the parts 3 and 4. The bearing cylinder that supports both shaft end portions 8L and 8R of the spot plate cylinder 6 is
L and 9R are divided into bearing inner cylinders 10L and 10R that fit into the bearing outer cylinders 9L and 9R. The outer diameter circles φD ₁ of the bearing outer cylinders 9L and 9R are fitted in the coaxial holes formed in the left and right frames 1L and 1R of the printing press. Bearing outer cylinder 9L,
9R is pin 12 and 12 and metal fitting 13 by lever 11L and 11R for outer cylinder.
The left and right synchronous rotation can be performed within a fixed angle α via L and 13R. The inner diameter circle φD ₂ of the bearing outer cylinders 9L and 9R has an appropriate eccentricity e ₁ with respect to the outer diameter circle φD ₁ . Shaft end portion 8L, the bearing inner cylinder 10L for supporting the 8R, inner diameter circle [phi] D ₃ of 10R has a predetermined eccentricity e ₂ with respect to the outer diameter [phi] D _2, the bearing inner cylinder 10L, the 10R the bearing outer cylinder 9L ,
By fitting to the inner diameter circle φD _{2 of} 9R, the inner cylinder levers 14L and 14R can rotate left and right synchronously within a fixed angle β by the pins 15 and 15 and the metal fittings 16L and 16R.

Center of eccentricity of spot plate cylinder 6 (A in FIG. 2, B in FIG. 4)
An enlarged view of is drawn in FIGS. 3 and 5. E is the center of the outer diameter circle φD ₁ of the bearing outer cylinders 9L and 9R, and In is the inner diameter of the bearing outer cylinders 9L and 9R when the spot plate cylinder 6 is in pressure contact with the blanket cylinder 4. The center of the circle φD ₂ , and Ir is the center of the inner diameter circle φD ₂ of the bearing outer cylinders 9L, 9R when the spot plate cylinder 6 is in pressure contact with the blanket cylinder 3. Cn and Cr indicate the axial center positions of the spot plate cylinder 6 in the states of FIGS. 2 and 4, respectively.

Cn and Cr are centered on In and Ir, respectively, and the center pin of the lever pin 15 for the inner cylinder K
It is obtained by drawing a circle with a radius equal to the eccentricity e ₂ of the bearing inner cylinder so that the straight line ▲ ▼ and ▲ ▼ are oriented at the same angle γ.

17 and 18 are outer cylinder levers 11L and 11R and inner cylinder lever 14 respectively.
Reference numerals 19 and 20 denote connecting arms of the rotating arms 17 and 18, respectively.

Next, the operation of this device will be described with reference to the drawings.

While the cylinder levers 14L and 14R are fixed at the solid line positions (operating positions) shown in FIGS. 2 and 4, the outer cylinder levers 11L and 11R are rotated from one end to the other end by the angle α, so that the outer cylinder inner diameter Because the eccentricity of the circle is e ₁ , its center moves on the eccentric circle and In
Alternatively, the spot plate cylinder center occupies the position of Cn or Cr because of the eccentricity e ₂ of the inner cylinder inner diameter circle, and the spot plate cylinder 6 has one blanket cylinder [4, 4 in FIG. 2].
3] in the drawing, and maintains a predetermined gap S with the other blanket cylinder [3 in FIG. 2 and 4 in FIG. 4]. By switching the outer cylinder levers 11L and 11R in this manner, the blanket cylinder that presses the spot plate cylinder 6 can be switched to the other blanket cylinder. Note that this switching is performed by changing the inner cylinder levers 14L and 14R to the pins 20'- in Figs.
The fine line position (the spot plate body cutting position) where 15 'is connected is also possible as described above.

〔The invention's effect〕

As described above, according to the present invention, the bearing inner cylinder that supports the shaft end portions on both sides of the spot plate cylinder and the bearing outer cylinder that supports the bearing inner cylinder are formed as double eccentric bearings so as to be eccentric. The rotation of the outer cylinder allows the spot plate cylinder to be switched, and the rotation of the inner cylinder allows the spot plate cylinder to be attached / detached, facilitating the attachment / detachment of the spot plate cylinder, which is frequently performed in every operation, to create a single eccentricity. There is no concern about wear between the bearing and the frame hole, which can be seen in the bearing, and even if the spot plate cylinder reaches the left blanket cylinder or the right blanket cylinder, the position (cylinder center Cn or At the Cr position), the lever is always connected with a toggle mechanism, which has the effect of preventing printing pressure loss or changes in printing pressure due to air loss.

[Brief description of drawings]

1 to 6 are embodiments of the present invention. FIG. 1 is a sectional view of a main portion of a spot plate cylinder, FIG. 2 is an explanatory view showing a state in which the spot plate cylinder is switched to the right, and FIG. Fig. 2 is an enlarged view of Fig. 2A, Fig. 4 is an explanatory view showing the state where the spot plate cylinder is switched to the left, Fig. 5 is an enlarged view of Fig. 4B part, and Fig. 6 is a spot plate cylinder switch. FIG. FIG. 7 and FIG. 8 are layout diagrams of a printing press roller showing a conventional example. 1L, R …… Left and right frame, 10L, R …… Bearing inner cylinder 3,4 …… Blanket cylinder, 11L, R …… Outer cylinder lever 6 …… Spot plate cylinder, 14L, R …… Inner cylinder lever 7 ...... Continuous paper 8L, R ...... Both shaft ends 9L, R ...... Bearing outer cylinder

Claims (1)

[Claims] 1. A pair of blanket cylinders for performing monochrome printing on both sides of the continuous paper while holding the continuous paper, and a spot plate cylinder disposed above the blanket cylinder for adding spot printing to one surface of the continuous paper. In a rotary printing press, a bearing inner cylinder that supports both axial end portions of the spot plate cylinder and a bearing outer cylinder that supports the bearing inner cylinder are configured to be eccentric, and the spot outer plate is rotated by rotating the bearing outer cylinder. A spot plate cylinder switching device for a rotary printing press, characterized in that a blanket cylinder contacting the cylinder is switched, and the spot plate cylinder is separated by rotating the bearing inner cylinder.