JPH0228051Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an intaglio cylinder to which an intaglio for printing is mounted in an intaglio printing press.

Printing work with an intaglio printing machine involves wiping off excess ink other than the pattern area of the ink supplied to the intaglio surface on the intaglio cylinder by the inking device with a wiping roller, and then wiping off the remaining ink from the pattern area between the intaglio cylinder and the impression cylinder. Printing is performed by transferring the image onto the paper that passes between the two.

Ink for such intaglio printing is generally hard and highly viscous, and in this state it is difficult to supply it from the inking device, and it is difficult to supply it from the inking device to the intaglio surface, and from the intaglio surface to the paper. Because of the poor transferability, hot water is passed into the rollers of the inking device to warm the ink. However, if the temperature of the intaglio surface is low even after much effort is taken to warm it up, the transferability to the intaglio surface will deteriorate due to this temperature difference, and the ink will not be able to sufficiently penetrate into the fine grooves of the intaglio. Therefore, the temperature of the ink is set in consideration of this temperature difference, but the temperature of the intaglio cylinder is low for a while after printing starts, and then it gradually warms up as heat generated by the bearings etc. is transferred. In any case, it is extremely difficult to set the temperature of the ink in the inking device so that the ink on the intaglio is at an appropriate temperature, and during this time there are differences in the ink transfer, making it impossible to print uniformly. There are drawbacks.

In particular, intaglio printing machines require a large printing pressure, so the diameter of the intaglio cylinder and impression cylinder must be made large, and generally a triple or quadruple cylinder is used to print three sheets during one rotation of the cylinder. In addition to the above-mentioned temperature change over time, the difference in temperature between the four plates can cause differences in ink transferability, resulting in uneven printing. It was a lot.

This idea was created with these points in mind.
A plurality of holes parallel to each other in the circumferential direction and parallel to the cylinder core are bored from the cylinder end side in each part of the intaglio cylinder where each intaglio is installed, and an electric heating element and a heat-sensitive element are loaded into these holes. , by making the wattage of the electric heating elements larger on the side where the body is held in the mouth than the electric heating element on the butt side, and making both ends of each electric heating element larger than the central part, the wattage between each intaglio plate and To provide an intaglio cylinder that eliminates changes in ink over time and makes printing uniform. Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figures 1 to 3 show an embodiment of an intaglio cylinder according to the present invention. Figure 1 is a side view of a quadruple diameter intaglio cylinder embodying the present invention, and Figure 2 is a partially enlarged view. FIG. 1 is a sectional view taken along line AA, and FIG. 3 is an electrical wiring diagram. In the figure, a quadruple-diameter intaglio cylinder 2 supported by left and right machine frames 1 is integrally formed with a cylinder main body 3, a disc-shaped pair 4 at both ends thereof, and an end shaft 5. On the outer periphery of the barrel body 3, four intaglio mounting portions 6 and four fan-shaped notches 7 having circumferential angles approximately equal to eight equal parts of the circumference are alternately provided. Reference numeral 8 denotes four intaglio plates having concave pattern parts, and both ends are held by a plate vise 9 provided in each notch 7, and the body peripheral surface between each notch 7, that is, the intaglio mounting portion 6 attached to the periphery of the On the core side of each intaglio 8, there are six heater holes 10 penetrating the entire length of the cylinder body 3, and a short thermos located in the center and parallel to the heater holes 10 at one end of the cylinder body 3. A screw hole 12 and a through hole 13 corresponding to the heater hole 10 are formed in the bearer 4 on the side where the thermostat hole 11 is provided. A sheathed heater 14 as an electric heating element is inserted into each heater hole 10 through a screw hole 1.
It is supported by an insulator 15 screwed into the heater hole 2 and an insulator 16 loaded at the other end of the heater hole 10, and is inserted while being insulated from the trunk body 3, and is fixed with a nut 17. Generally, in the intaglio plate 8, the side that precedes the intaglio cylinder 2 in the direction of rotation shown by arrow B in FIG. 1 is called the gripping side, and the opposite side is called the butt side. Then, the sheathed heater 14 holds one of the heaters in its mouth.
700W, and the remaining 5 wires are set to 500W, and by adjusting the winding density of the nichrome wire, etc.
The 700W model is set to 270W at both ends and 160W at the center, and the 500W model is set to 270W at both ends.
It is set to 200W and the center part to 100W. Further, a thermostat 18 as a heat sensitive element is inserted into the thermostat hole 11 from the through hole 13 of the bearer 3.
is inserted and fixed to bearer 3. Reference numeral 19 denotes a terminal mounting piece formed in a fan shape, which is fitted into an annular groove 20 provided on the end face of the bearer 4 and fixed with a bolt 21. is attached, and a wiring hole 23 is bored.

On the other hand, thirteen slip rings 24 are attached to one end shaft 5 of the intaglio cylinder 2 protruding from the frame 1, and a carbon brush 25 is in contact with each slip ring 24. A lead wire 2 is connected from the fixed end of each sheathed heater 14.
6 are led to the end shaft 5 through a terminal 22 and a pipe 27 provided on the end surface of the bearer 4, and the positive side of the pipe 24 is connected to one slip ring 24 at once.
The negative side is divided into parts corresponding to the four intaglios 8 and connected to the four slip rings 24, respectively. Also, from the fixed end of the thermostat 18,
A lead wire 28 is led to the end shaft 5 through the wiring hole 23 and the pipe 27, and each of the eight lead wires 28 on the positive side and negative side of the four thermostats 18 is connected to a separate wire. It is connected to each slip ring 24. Each of the carbon brushes 25 is connected to a power source different from the power source for driving the machine base via a control device (not shown) for each of the four intaglio plates 8, and the sheathed heater 14 is The structure is such that the connection/disconnection is performed for each intaglio plate 8, and the temperature of each of the four intaglio plates 8 is controlled separately.

In the intaglio cylinder 2 constructed as described above, a plurality of ink forming rollers (not shown) are in contact with the circumferential surface thereof, and the ink flowing out from the ink fountain is transferred to the ink forming rollers via the roller group, and the intaglio printing As the cylinder 2 rotates, the ink is transferred to each intaglio plate 8 by an ink forming roller and rubbed into the grooves of the pattern portion.
In this case, as described above, even if the ink warmed within the inking device is transferred, the temperature of the ink will drop if the intaglio 6 is cold. However, in this device, the sheathed heater 1 is placed close to the back side of the intaglio plate 8.
4, the ink whose temperature is about to drop is warmed by the intaglio plate 8, whose temperature is rising due to heat transfer from the effective printing area heated by the sheathed heater 14, and the temperature does not drop. The temperature of the intaglio plate 8 is controlled for each intaglio plate 8 by connecting or disconnecting the sheathed heater 14 via the control device based on the temperature detection of the thermostat 18 provided for each of the four intaglio plates 8. Each intaglio plate 8 can maintain the temperature set by the control device, and the temperature of the ink in each intaglio plate 8 does not drop. In addition, this heating device is connected to a power source separate from that used to drive the main machine, and can raise the temperature of the intaglio plate 8 prior to operation, so that the ink temperature does not drop even when printing starts. 6 more sheathed heaters 14
are distributed over the entire surface of the intaglio plate 8, so that the temperature of each part of the intaglio plate 8 can be raised uniformly. In particular, in the present invention, since the wattage of the sheathed heater 14 on the gripping side is increased, the intaglio cylinder 2
Even if the temperature on the gripping side decreases due to air resistance due to high-speed rotation, this can be compensated for and the same temperature as other parts can be maintained. Further, since the wattage at both ends of the sheathed heater 14 is made larger than the wattage at the center, the temperature at both ends of the intaglio 8, which is relatively easily cooled, can be maintained at the same temperature as the center.

As explained above, according to the present invention, a plurality of holes parallel to each other in the circumferential direction and parallel to the cylinder core are directly bored from the cylinder end side in each part of the intaglio cylinder where each intaglio is attached. An electric heating element and a heat-sensitive element are loaded in the inside, and the wattage of the electric heating element is set such that the electric heating element on the side where the torso is held in the mouth is larger than the electric heating element on the buttocks side, and both ends of each electric heating element are set higher than the central part. By making it large,
Since the temperature at each location within each intaglio plate and the temperature of each of the plurality of intaglio plates can be maintained at a set temperature, ink transfer to the intaglio plates is improved, and the quality of printed matter can be significantly improved. Also, since the temperature of the intaglio can be raised in advance,
This prevents the ink temperature from dropping at the start of printing, eliminating paper waste and quality deterioration of printed matter due to poor transfer to the intaglio plate.Furthermore, continuous temperature control allows the ink temperature to change over time. Therefore, it is possible to always obtain extremely uniform printed matter, and there is no need to adjust the temperature over time, improving work efficiency.

[Brief explanation of the drawing]

1 to 3 show an embodiment of an intaglio cylinder of an intaglio printing press according to the present invention, FIG. 1 is a side view of a quadruple diameter intaglio cylinder embodying the present invention, and FIG. 2 is a partial view of the same. FIG. 1 is an enlarged cross-sectional view along AA, and FIG. 3 is an electrical wiring diagram. 2... Intaglio cylinder, 8... Intaglio, 14... Sheathed heater, 18... Thermostat, 24... Slip ring, 26, 28... Lead wire.

Claims (1)

[Scope of utility model registration request] In an intaglio cylinder 2 having an integral multiple diameter and having a divided circumferential surface on which a plurality of intaglios 8, 8... are mounted, for each portion 6 to which each intaglio 8, 8... is mounted, A plurality of holes 1 parallel to the circumferential direction and parallel to the core of the body
0, 10...11 are drilled from the end surface side of the body, and the electric heating element 14 and the heat-sensitive element 18 are loaded into the hole, and the wattage of the electric heating element 14, 14... is as follows.
An intaglio cylinder for an intaglio printing machine, characterized in that the electric heating element on the side of the circumference of the cylinder is made larger than the electric heating element on the rear side, and both ends of each electric heating element are made larger than the central part.