JPH0214902B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inking device for supplying ink stored in an ink fountain to an intaglio surface in an intaglio printing press.

Printing with an intaglio printing machine involves wiping away ink other than the pattern area from the ink supplied to the intaglio surface on the plate cylinder by the inking device, and removing any remaining ink onto the paper that passes between the plate cylinder and the impression cylinder. Printing is done by transferring the ink from the ivy pattern.

The inking device of this type of intaglio printing press includes an ink fountain that stores ink, a group of rollers that smooths and transfers the ink flowing out from the ink fountain in each direction.
It is equipped with an ink forming roller that adheres the ink transferred to the plate surface via a group of rollers, and among these, the ink forming roller is called a pattern roller in the case of an intaglio printing machine, and has a diameter that is an integral fraction of the intaglio cylinder. A pattern having a slightly larger area than an intaglio is formed on the circumferential surface using a rubber letterpress.

In such an inking device, it is necessary to uniformly level the ink flowing from the ink fountain in each direction before supplying it to the printing plate, so a large number of rollers are installed between the ink fountain and the pattern roller. ing. However, although the ink is made uniform by passing through many rollers, when the ink is kneaded between the rollers many times, the viscosity increases and the wiping roller may not be able to wipe the ink sufficiently. In other words, when there are a large number of rollers, not only does the number of contact surfaces between the rollers, or nips, increase, but also because each time the ink toward the printing plate passes through a nip, approximately half of it is returned to the upstream roller. The viscous inks attract each other and remain untransferred, and when these highly viscous inks are mixed together and supplied to the printing plate, the wiping effect decreases and the printed matter becomes unclear. was. Further, in this case, a strong triclene-based cleaning liquid must be used as the wiping cleaning liquid, which poses a problem in terms of pollution prevention.

Therefore, it is desirable to reduce the number of rollers between the ink fountain roller and the pattern roller as much as possible, or to bring both rollers into direct contact with each other. In addition to the ink being supplied, the ink is not well kneaded, is loose, and has poor transferability between the rollers, so a large amount of ink is inevitably supplied, resulting in the ink being removed by wiping. As the amount increases, the amount of ink and wiping cleaning liquid used increases, causing problems such as increased running costs.

The present invention has been made in view of the above points, and it is possible to ink by providing a pattern roller having a letterpress on its circumferential surface with its circumferential surface facing the intaglio surface on the intaglio cylinder and the circumferential surface of the ink fountain roller. In addition to improving the wiping effect by lowering the viscosity of the ink, by making the peripheral speed of the pattern roller 1 to 3% faster than the peripheral speed of the intaglio, the ink is rubbed into the intaglio surface, promoting ink transfer, and reducing the viscosity. To provide an inking device for an intaglio printing press that eliminates the deterioration of ink transferability due to the ink transfer property and reduces the amount of ink supplied and the amount of cleaning liquid for wiping. Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 3 show an embodiment of the inking device according to the present invention, FIG. 1 is a side sectional view thereof, FIG. 2 is a BB sectional view of FIG. 1, and FIG. 3 is an A of FIG. FIG. In these figures, on the left and right frames 1 and 2 of the printing press, a concave plate cylinder 3, which rotates in the direction shown by arrow C in the figure, is supported by an intaglio plate on its circumferential surface. A pair of left and right brackets 4 are fixed to frames 1 and 2 with bolts 5, and pot frames 6 and 7 are further fixed to the left and right brackets 4 with bolts 8. . The urn frames 6 and 7 are a substrate 6 formed in an L-shape.
a, 7a and pairing cases 6b, 7b which are installed upright at the ends of the intaglio cylinder 3 side of the substrates 6a, 7a, and the pairing case 6b includes:
Ball bearing 9 is bearing holder 10, 11
It is fitted in such a way that movement in the axial direction is restricted.
Further, ball bearings 12 and 13 are fitted into the bearing case 7b, with their movement in the axial direction being restricted by bearing holders 14 and 15 and a spacer 16. The reference numeral 17 is an ink fountain roller, and both end shafts 18 and 19 are supported by ball bearings 9, 12, 13. but,
Spacer 2 between ball bearings 9 and 13
They are screwed together via 2 and 23. In addition, the end shaft 1
A gear 24 and a spacer 25 are interposed between the stepped portion of 8 and the ball bearing 9, and a spacer 26 is interposed between the roller end face on the end shaft 19 side and the ball bearing 12. These restrict the movement of the ink fountain roller 17 in the axial direction. Further, the ink fountain roller 17 has its end shaft 1
A drive gear (not shown) provided on the frame protrusion 9 is connected to the driving side, and rotates in the direction indicated by arrow D in the figure at the same circumferential speed as the intaglio cylinder 3 or slightly lower than this. Additionally, inside thereof, a piping 29 and a hot water passage 30 are provided for circulating hot water of about 50° C. that enters from the inlet 27 and exits from the outlet 28. In addition, frames 1 and 2 have end shafts 1
A hole 31 larger than holes 8 and 19 is bored.

32 is a fountain stay that is approximately the same length as the main body of the ink fountain roller 17, and is integrally formed with an inclined blade receiving portion 32a and a supporting portion 32b extending downward in a T-shape. By pivoting the support portion 32b to the side plate of the stay 33 that connects the left and right urn frames 6, it is configured to be rotatable counterclockwise from the position shown in FIG. 1 and fixed at any position. ing. 34 is a handle for rotating the pot stay 32. A long blade stand 35 is fixed to the inclined surface of the fountain stay 32, and a blade 36 made of a thin steel plate is attached to the blade stand 35, and its tip is brought into almost contact with the circumferential surface of the ink fountain roller 17. Let it be installed. 37 is formed into a triangular plate shape, and the blade 36
A pair of left and right ink wells constitute an ink fountain 38 together with the ink fountain roller 17, and ink 39 for printing is stored in the ink fountain 38.
Further, a large number of pot keys 40 are screwed into the support portion 32b of the pot stay 32 so that they can move forward and backward with their tips in contact with the blade 36. By moving each pot key 40 forward and backward, the blade 36 and the ink fountain are connected. The gap between the roller 17 and the roller 17 is changed so that the amount of ink 39 flowing out is adjusted for each section.

Furthermore, brackets 4 are attached to the left and right urn frames 6.
1 is mounted below the shaft support of the ink fountain roller 17, and a bearing 42 having a tapered surface at the lower end is movable vertically relative to the substrates 6b, 7b by means of a collar. Moreover, its movement in the lateral direction is restricted. In the left and right bearings 42, a rider roller 43 has its peripheral surface facing the ink fountain roller 17 directly below it, and this rider roller 43 has a nut 44 on its end shaft to restrict its movement in the axial direction. By meshing the gear 45, which is rotatably mounted, with the gear 24, it is configured to be driven from the ink fountain roller 17 side and rotated in the direction shown by arrow E in the figure at the same circumferential speed as the ink fountain roller 17. Further, a grooved cam 46 is fixed to the other end shaft of the rider roller 43 with its movement in the axial direction being restricted by a nut 46a. It is configured to reciprocate in the axial direction by engaging with and rotating. Furthermore, an adjustment screw 48 is inserted into the screw hole of the bush 47 fitted to the left and right frames 1 and 2 so that the tapered portion at the tip faces the tapered surface of the bearing 42 and can be adjusted forward and backward. By grasping the knob 49 and rotating it, the ink fountain roller 17
The structure is such that the contact pressure of the rider roller 43 against the roller is adjusted. 50 and 51 are a scale plate and a pointer that display this contact pressure.

Between the ink fountain roller 17 of the ink fountain device configured in this way and the intaglio cylinder 3, there is a rubber letterpress having a pattern that is approximately 5 mm larger than the pattern formed on the intaglio on the intaglio cylinder 3. A pattern roller 52 installed on the peripheral surface faces the ink fountain roller 17 and the intaglio cylinder 3 with its peripheral surface facing the left and right frames 1 and 2.
It is pivoted on. This pattern roller 52 has
The pattern roller 52 is driven and connected to the intaglio cylinder 3 by a gear and rotates in the direction shown by arrow E in the figure, and the circumferential speed of the pattern roller 52 is 1.8% faster than the circumferential speed of the intaglio on the intaglio cylinder 3. The roller diameter and number of teeth of the pattern roller 52 are set. That is, when the roller diameter of the pattern roller 52 is set to an integral fraction of the roller diameter of the intaglio cylinder 3, the number of teeth of the gear of the intaglio cylinder 3 is set to an integral multiple of the number of teeth of the gear of the pattern roller 52, and the pattern roller 52 The diameter of the outer peripheral surface of the convex portion is set to be slightly larger than the pitch circle diameter of the gear of the pattern roller 52.

The operation of the inking device configured as above will be explained. . When the machine is operated, the rotation on the driving side is transmitted to the intaglio cylinder 3, and then to the pattern roller 52 and the ink fountain roller 17, so that the intaglio cylinder 3 and the ink fountain roller 17 rotate at the same circumferential speed, and the pattern roller 52 is 1.8 higher than the peripheral speed of the intaglio on the intaglio cylinder 3.
Rotates at % faster circumferential speed. In addition, ink fountain roller 1
The rotation of the roller 7 is transmitted to the rider roller 43 through the meshing of the gears 24 and 45, and the rotation of both rollers 17,
43 rotates at approximately the same circumferential speed. This rotation causes
The ink 39 in the ink fountain 38 is transferred to the ink fountain roller 1.
The ink flows out from the gap between the ink fountain roller 7 and the plate 36, is carried around by the ink fountain roller 17, and adheres to its peripheral surface, and is heated to about 50° C. by the hot water circulating through the piping 29 and the hot water passage 30. The warmed ink 39 is evenly leveled by a rider roller 43 that reciprocates in contact with the ink fountain roller 17, and is transferred to the letterpress surface of the pattern roller 52. The ink on the letterpress is transferred to the intaglio cylinder 3 that is in contact with it.
However, since the peripheral speed of the pattern roller 52 is set to be 1.8% faster than the peripheral speed of the intaglio, sliding occurs between the peripheral surface of the pattern roller 52 and the intaglio surface. , ink 39 is rubbed into the concave pattern portion of the intaglio. In other words, the ink 39, which had a low viscosity and poor transferability between rollers due to the reduced number of rollers,
This rubbing action ensures transfer to the intaglio surface. In this way, sufficient ink 39 is deposited on the pattern on the intaglio surface, and by making the letterpress pattern slightly larger than the intaglio pattern, excess ink 39 is deposited on areas other than the intaglio pattern.
will adhere slightly. This extra ink 39 is
The ink is wiped off by a wiping roller (not shown), leaving ink only in the pattern area, and printing is applied to the paper passing between the impression cylinder and the printing cylinder. In addition, the amount of ink for each axial section on the intaglio is
It is adjusted by rotating the 0 back and forth.

Note that in this embodiment, the pattern roller 5
An example was shown in which the circumferential speed of 2 was set to be 1.8 faster than the circumferential speed of the intaglio, but this speed increase rate was 1% and 3%.
Experiments have shown that an ink rubbing effect can be obtained between the two.

As is clear from the above description, according to the present invention, in an inking device of an intaglio printing press, a pattern roller having a relief plate on its circumferential surface is aligned with the intaglio surface on the intaglio cylinder and the circumferential surface of the ink fountain roller. By placing the pattern rollers in contact with each other, the number of rollers is reduced and the ink is supplied to the intaglio surface in a smooth state, which significantly improves the wiping effect, and the peripheral speed of the pattern roller is 1 to 3% faster than the peripheral speed of the intaglio. By doing this, the peripheral surface of the pattern roller and the intaglio plate slide, and the ink is rubbed into the pattern part of the intaglio plate, eliminating the deterioration of ink transferability due to a decrease in viscosity.
There is no need to supply extra ink, and the amount of ink supplied and the amount of cleaning fluid used for wiping can be significantly reduced, resulting in a significant reduction in running costs.

[Brief explanation of drawings]

1 to 3 show an embodiment of the inking device of an intaglio printing press according to the present invention, FIG. 1 is a side sectional view thereof, FIG. 2 is a BB sectional view of FIG. 1, and FIG. FIG. 2 is a front view from B in FIG. 1; 3... Intaglio cylinder, 17... Ink fountain roller, 52
...Patanrolla.

Claims (1)

[Claims] 1. A pattern roller having a relief plate attached to its circumferential surface is provided with its circumferential surface facing the intaglio plate attached to the intaglio cylinder and the circumferential surface of the ink fountain roller, and the pattern roller is moved at a circumferential speed of 1 to 3 times faster than the circumferential speed of the intaglio plate. An inking device for an intaglio printing press that is characterized by rotational drive at a % faster circumferential speed.