JPH0425331Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention consists of an inking device that deposits ink on the plate cylinder, which is composed of an ink tank and a plurality of roller rows, and an inking device that deposits ink on the plate cylinder, which is made up of a water tank and a plurality of roller rows. The present invention relates to a liquid supply device for a rotary printing press, which comprises a plurality of sets corresponding to the printing units, and each printing unit is provided with a dampening device for feeding the liquid to the printing unit.

[Conventional technology]

A conventional offset rotary printing press has an impression cylinder at its center and a plurality of printing units each consisting of a blanket cylinder and a plate cylinder. , an inking device for depositing ink on a plate cylinder, which has a roller row such as a call-up roller, a water tank, a deposition roller, a feed roller,
Each set of liquid supply devices is provided, consisting of a dampening device for conveying water to the plate cylinder, having a row of rollers such as a call-up roller. In order to selectively drive a plurality of sets of one set of liquid supply devices and one set of printing units in accordance with the number of colors for multicolor printing, a plurality of control units for controlling these are also provided independently. In this case, each of the control units includes an ink-feeding roller drive unit of the inking device, an attachment/detachment device for attaching and detaching the applicator roller to and from the plate cylinder, a water-feeding roller drive unit of the dampening device, and the attachment/detachment device. One set of control units corresponds to one set of printing units to control the drive and timing of attachment/detachment of the attachment/detachment device for water similar to the above, and the attachment/detachment device for attaching and detaching the blanket cylinder to and from the impression cylinder. It is provided.

In a rotary printing machine having a control section with such a configuration, after the impression cylinder is started and rotated, the blanket cylinder waits without being loaded until the blanket cylinder can be loaded onto the impression cylinder and printing can be started. During this time, water and ink are sent to the blanket cylinder in this order from the dampening device and the inking device. When the rotational speed of each feed roller of the dampening device and the inking device reaches a rotation speed that allows a predetermined amount or more of water and ink to be deposited on the blanket cylinder, the water and ink are deposited on the blanket cylinder, and the plate cylinder or When the blanket cylinder reaches the synchronous rotational speed of the impression cylinder after one or more predetermined revolutions, the blanket cylinder is loaded onto the impression cylinder and printing is started. After printing starts, the plate cylinder, blanket cylinder,
The call-up roller of the dampening device and the call-up roller of the inking device are speed regulated. Thus, for example, in a four-color offset rotary printing press, the four printing units enter printing operation sequentially, starting with the printing unit that is at the head of the paper feed. The mutual phase adjustment of the printing units with respect to the predetermined position of the paper to be printed is individually adjusted manually in advance before printing starts. Thus, in conventional offset rotary printing presses, an independent control unit is provided for each printing unit including the liquid supply device.

[Problem that the invention attempts to solve]

In such a conventional control unit configuration, the plate cylinder is prepared for each printing unit in the above-mentioned order of supplying water and ink and landing on the cylinder, and once steady operation begins, the supply of water and ink is stopped. Printing is performed continuously each time paper is printed, but if a phase shift occurs between the printing units due to fluctuations in printing speed or for some other reason, the inking device and dampening device must be adjusted for each control unit. If the rotation angle and rotation speed of each roller with respect to the printing unit are adjusted, the deviation between the control units will become larger, which may not be appropriate. Since even a slight phase shift between printing units cannot be tolerated when printing on a predetermined position on paper, a control method that can reliably perform the above adjustment has been desired.

This idea was made in view of the above problems, and instead of controlling each roller of the inking device and dampening device independently for each printing unit in the printing machine or the impression cylinder, The inking devices of all printing units of each press installed in the press are grouped into one group, and all the dampening devices are grouped into another group, and each group is centrally controlled via one central processing unit (CPU). According to
It is an object of the present invention to provide a liquid supply device for a rotary printing press that can easily eliminate errors in adjustment between an inking device and a dampening device caused by positional deviation between printing units.

[Means for solving problems]

As a means to solve the above problems, this invention includes an inking device that applies ink to the plate cylinder using an ink tank and a plurality of roller rows, and a dampening device that sends water to the plate cylinder using a water tank and a plurality of roller rows. , an electric control circuit is provided for each printing unit and controls the plurality of sets of inking devices and the plurality of dampening devices as a group, and this control circuit operates based on the rotation speed of either the impression cylinder or the plate cylinder. A comparator compares this with the rotational speed of the drive motor of the inking device group and the drive motor of the dampening device group, and the output signal is used to adjust the power supply voltage of the drive motor for each group via the central processing unit. The rotational speed of the drive motor corresponds to the rotational speed of either the impression cylinder or the plate cylinder, and the operation of attaching and detaching the ink and dampening device to the plate cylinder for each group and the rotation of the plate cylinder to the other cylinder are controlled. The liquid supply device for a rotary printing press is constructed so that the mounting and dismounting operations are centrally controlled so that each mounting and dismounting operation is performed with a difference in rotation angle of the plate cylinder corresponding to a predetermined order.

In the above device, the electrical control circuit
A function generator is provided in the electric voltage circuit for each group, and the inking device group changes the rotation speed of the drive motor linearly with respect to the rotation speed of either the impression cylinder or the plate cylinder, and the dampening device group The power supply voltage of the drive motor is adjusted by changing the rotation speed of the drive motor in a non-linear manner including the bias amount, strengthening amount, and gain with respect to the rotation speed of either the impression cylinder or the plate cylinder. It may be configured to make adjustments.

[Effect]

For example, 4, selected depending on the number of colors to be printed.
Each group of dampening devices and inking devices in the color liquid supply device is capable of starting its drive motor, attaching and detaching the dampening device to the plate cylinder, attaching and detaching the inking device to the plate cylinder, and controlling the rotation speed and rotation angle. All of this is done in response to command signals from the central processing unit based on the rotational speed of the impression cylinder or plate cylinder for each group. The starting and attachment/detachment operations are controlled by analog switches, electromagnetic valves, etc. provided in the control circuit. These controls are performed in relation to each group, so even if there is a rotational speed or phase shift in some of the printing units as in the case of conventional control for each printing unit, the settings can be made for each group. Based on the data stored in the central processing unit, command signals are output to each drive motor and solenoid valve. Therefore, even if the phase shift or the like occurs in a specific member, the adjustment can be easily made by simply adjusting and removing the phase shift of the specific member without making adjustments with other groups or members.

〔Example〕

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of a single-sided, four-color printing offset rotary printing press. In the figure, around the impression cylinder 1 there are blanket cylinders 2a to 2d,
There are four printing units each consisting of plate cylinders 3a to 3d.
For each set of printing units, ink fountains 4a to 4d and call rollers 6a to 6a are provided.
d, kneading rollers 7a-d, dressing rollers 8a-d
1 set of liquid supply devices consisting of an inking device having roller rows such as water fountains 5a to 5d, a dampening device having roller rows such as calling rollers 9a to 9d, feed rollers 10a to 10d, and applicator rollers 11a to 11d. have each.

The ink fountain 4 and the water fountain 5 are provided with various equipment similar to conventional equipment for performing necessary functions such as adjusting the amount of liquid supplied, but detailed explanation thereof will be omitted.

The arrangement of the roller rows of the dampening device belonging to the upper left printing unit in the figure is slightly different from that of the other printing units in relation to the amount of water supplied.

FIG. 2 is a partially enlarged view of an inking device and a dampening device provided in one of the four printing units. Applying ink from the inking device to the plate cylinder 3D
A cylinder 12d and an eccentric rod 13d are provided for attaching and detaching the attachment roller 8d to and from the plate cylinder 3d in relation to the rotational speed and angle of rotation. Similarly, the dampening device is provided with a cylinder 14d and an eccentric rod 15d. The cylinders 12d and 14d are controlled by solenoid valves 34d and 34d' in an electric control circuit shown in FIG. 3, which will be described later, to attach and detach the attachment roller.

Although not shown, the blanket cylinders 2a to 2d
A similar attachment/detachment mechanism as described above is provided, and attachment/detachment to and from the impression cylinder is also performed using this mechanism.

FIG. 3 is a block diagram of the control circuit of the liquid supply device according to this embodiment.

In the figure, 21 is a tacho generator, 22 is an amplifier, 23 and 24 are function generators, and 25 and 26 are A/
D converter, 27, 28 are switch circuits, 2
9 and 30 are comparators, 33 is a central processing unit, 34 is a solenoid valve, and 35 and 36 are DC motors.

This control circuit is roughly divided into two groups: the four inking devices and the four dampening devices, and is configured to centrally control each group via the central processing unit 33.

The power supply is A/
A DC motor 35a drives the calling rollers 6a to 6d of the four inking devices via the D converter 25.
~d~35d. A command signal is sent to the A/D converter 25 to change the output voltage of the A/D converter 25 so that the number of rotations of the DC motors 35a to 35d becomes the required number of rotations.
5 is provided. This function generator 23 uses as an input signal a signal representing the rotational speed of the impression cylinder 1, which is obtained by amplifying the output of a tacho generator 21 attached to the drive motor (not shown) of the impression cylinder 1 with an amplifier 22, and is constant with this signal. The output signal is configured to output an output signal that changes in a functional relationship. Note that analog switch circuits 27a to 27d are provided between the A/D converter 25 and the DC motors 35a to 35d, respectively, for finely adjusting the supply voltage in order to finely adjust the rotational speed of the motors 35a to 35d.

A power supply circuit having substantially the same configuration as the power supply circuit described above is provided for a group of dampening devices. However, in this case, only the configuration of the function generator is different because it changes the output voltage to a different functional relationship in response to differences in the chemical and physical properties of the water and ink supplied to the plate (this (will be explained later).

The configuration is such that the supply of current and voltage to these two groups of power supply circuits is controlled via the central processing unit 33. This central processing unit 33 receives a signal voltage from the tacho generator 21 indicating the rotation speed of the impression cylinder 1, and a voltage representing the rotation speed of the drive motors 35a to 35d, 36a to d of each group of the inking device and the dampening device. The comparators 29 and 30 compare the signals, and the output signals are sent to the analog switch 27a.
~d, 28a~d to supply current to each motor.
In addition to controlling ON and OFF, the output signal is also given to one of the function generators 24, thereby selecting a function in the function generator 24. moreover,
For the central processing unit 33, the attachment roller 8
An excitation circuit for the solenoid valves 34a-d, 34'a-d, which controls ON/OFF the cylinders for attaching and detaching the cylinders a-d, 11a-d to and from the plate cylinders 3a-d, and an excitation circuit for the dampening device and inking device. An analog switch corresponding to the drive motor and switches 32a to 32d are provided for selecting a necessary set of printing units according to the number of colors used for printing.

The function generator 23 of the inking device group is configured so that the ratio of the input voltage to the output voltage has a functional relationship in which the supply amount changes linearly with the number of rotations of the plate cylinder due to the properties of the ink. Volume 39, 40 to finely adjust the value and slope of the line.
are provided for each.

The function generator 24 of the dampening device group nonlinearly applies a predetermined bias amount (initial value), a strong amount, and a gain (inclination) corresponding to the water absorption of the plate as the reference rotational speed of the plate cylinder changes. a volume 41 configured to change the ratio of the input voltage to the output voltage and finely adjust the respective amounts;
42 and 43 are provided.

The operation of this embodiment configured as above will be explained.

Printing is carried out by rotating the impression cylinder 1 and attaching the blanket cylinder 2 to the impression cylinder 1 at a predetermined position on the paper to be printed. The blanket cylinders 2a to 2d are equipped with a mechanism for attaching and detaching them to and from the impression cylinder 1 (not shown) in the same manner as in conventional well-known offset printing machines.
The timing of attachment and detachment of the four blanket cylinders is controlled by another control circuit (not shown), and printing is performed on a predetermined position on the paper. A printing plate is wrapped around the printing cylinders 3a to 3d for each content to be printed, and a printing plate is formed by supplying and adhering ink and water from an inking device and a dampening device, and the contents of this printing plate are transferred to the blanket cylinders 2a to 2d. printed on paper via

The ink application by the inking device is carried out by rotating the calling rollers 6a to 6d by a motor to feed the ink, and mixing rollers 7a to 7a in contact with these rollers.
d. This is done via the attachment rollers 8a to 8d. As shown in FIG. 2, the attachment rollers 8a to 8d are attached to and detached from the plate cylinders 3a to 3d via the cylinder 12 by actuation of the electromagnetic valves 34a to 34d. The operation of the dampening device is essentially the same.

The order of supplying ink and water to the plate cylinders 3a to 3d is as follows:
In order to apply water to the printed and non-printed areas of the printing plate, which have been previously exposed to light, first apply water to the hydrophilic areas of the printing plate, then rotate the printing cylinder once or more than once to remove the water. The ink should be applied in the same phase as it is on the surface of the printing plate. The interleaving paper has started to be supplied along the impression cylinder 1 and the blanket cylinders 2a to 2d, but the operation of attaching and detaching the blanket cylinders 2a to 2d to and from the impression cylinder 1 is on standby. When sufficient time for ink deposition has elapsed, the drum deposition operation is started and printing begins.

Next, an electric circuit for controlling the drive of the printing operation described above will be explained.

The electric power supplied from the power supply side is converted into direct current of approximately a predetermined voltage in the A/D converters 25 and 26, and is then sent to the DC motors 35a to 35a of the inking device group.
d and the DC motors 36a to d of the dampening device Gnepe.
given to. A/D converters 25, 26 and each
Analog switches 27a to 27a provided between DC motors 35a to 35d and DC motors 36a to 36d, respectively.
d and 28a to 28d finely adjust the rotational speed of each of the DC motors for the plate cylinders 3a to 3d.

The voltages during DC conversion by the A/D converters 25 and 26 vary depending on command signals from the function generators 23 and 24, respectively. The function generator 23 of the inking device group operates so that the ratio of the voltage representing the rotational speed of the DC motors 35a to 35d to the reference plate cylinder rotational speed changes as a linear function, as shown in FIG. This is because the viscosity of ink is greater than that of water, and the amount of ink fed by the feed roller is directly deposited on the plate cylinder.

On the other hand, the function generator 24 of the dampening device group combines straight lines into a chevron shape from the bias amount at the beginning of dressing, which represents the initial water supply amount, with respect to the reference plate cylinder rotation speed, as shown in FIG. The output voltage is changed so that water can be supplied with a strengthening amount represented by a non-linear curve and a gain amount having an upward slope to the right. In this case, the nonlinear changes in the bias amount, strengthening amount, and gain amount are determined by comparing the standard rotational speed of the plate cylinder generated by the tacho generator with the voltage of the DC motors 36a to 36d in the comparator 30, and changing the bias amount, the strengthening amount, and the gain amount as the standard rotational speed increases. The above-mentioned non-linear change is performed based on a command from the central processing unit 33. The reason for the above-mentioned non-linear change is that the viscosity of water is smaller than that of ink, so when no control is applied, the amount of water supplied to the printing plate changes parabolically, as shown by the dotted line in Figure 4. This is because the amount of water supplied does not change linearly like ink supply, and the amount of water supplied is insufficient.

The bias amount, enhancement amount, and gain amount in the function generator 24 can be finely adjusted using the volumes 41, 42, and 43, respectively. Further, the analog switches 27a-d, 28a-d control the reference plate cylinder rotation speed and the plurality of DC motors 35a-d, 36.
Comparators 29 and 30 compare the rotational speeds of a to d, and if the error signal is within a predetermined range, the analog switch is turned on and energized according to the control signal, and the power supply to the DC motor is controlled on and off. do.
At this time, the central processing unit 33 has a built-in timing element, and is controlled to start the operations of the dampening device, inking device, and drum (plate cylinder) in the order shown in FIG. When the machine is to be stopped, the inking device, dampening device, and plate cylinder are removed in order to ensure that any remaining ink is printed on the printing paper.
During deceleration, the effect of water supply delay during startup is small, so the command signal is configured to control the supply amount in proportion to the speed. Volume 44a~
d, 45a to 45d perform fine adjustment of the supply voltage by the analog switch, and perform secondary adjustment of the plate cylinder rotation speed of each DC motor. To start the operation shown in FIG. 6 above, a control signal from the central processing unit 33 is sent to the solenoid valve 3.
4a-d, 34'a-d. When the above preparation operation is completed, the limit switch 31 connected to the central control device 33
Blanket cylinders 2a to 2d that are in standby until then
A control signal for moving and pressing the impression cylinder 1 to start printing is given to the moving mechanism (not shown) via the central processing unit 33.

〔effect〕

As detailed above, in this invention, the electric control circuit controls the inking device and the dampening device as a group, and one central processing unit centrally controls the drive units of each group. If a discrepancy in speed or phase occurs in each case, it is only necessary to adjust the part where the discrepancy occurs.
There is no need to adjust the overall phase shift with respect to other printing units, and the adjustment can be easily made and accurate printing can be performed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a schematic configuration of a four-color offset rotary printing machine equipped with a liquid supply device according to this invention, FIG. 2 is a partially enlarged view of the liquid supply device, and FIG. 3 is a diagram of the liquid supply device. A block diagram of the drive/control circuit, Fig. 4 shows the performance curve of the function generator for the inking machine, Fig. 5 shows the performance curve of the function generator for the dampening machine, and Fig. 6 shows the performance curve of the function generator for the dampening machine. FIG. 3 is a diagram showing the order of operation of water, ink, and loading cylinder with respect to the number of rotations of the plate cylinder. 1...Impression cylinder, 2a-d...Bracket cylinder, 3a
~d...Plate cylinder, 4a~d...Ink fountain,
5a-d...water fanten, 6a-d, 9a-d
... Call roller, 23, 24 ... Function generator,
25, 26...A/D...converter, 27a~
d, 28a~d...Analog switch, 29a~
d, 30a-d... comparator, 33... central processing unit, 35a-d, 36a-d... DC motor.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An inking device that applies ink to a plate cylinder using an ink tank and a plurality of roller rows, and a dampening device that sends water to the plate cylinder using a water tank and a plurality of roller rows, respectively. An electric control circuit is provided for each printing unit and controls the plurality of sets of inking devices and the plurality of dampening devices as a group, and this control circuit operates based on the rotation speed of either the impression cylinder or the plate cylinder. A comparator compares the respective rotational speeds of the drive motors of the inking device group and the dampening device group, and the output signal is used to determine the rotational speed of the drive motor for each group and its power supply voltage via the central processing unit. The rotational speed of the drive motor is adjusted to correspond to the rotational speed of either the impression cylinder or the plate cylinder, and the operation of attaching and detaching the ink and dampening device to and from the plate cylinder for each group and the other plate cylinders is adjusted. 1. A liquid supply device for a rotary printing press, which is configured to centrally control attachment and detachment operations to and from the plate cylinders so that each attachment and detachment operation is performed in a predetermined order with a difference in rotation angle of the plate cylinder. (2) The electric control circuit provides a function generator in the power supply voltage circuit for each group, and the inking device group linearly adjusts the rotation speed of the drive motor with respect to the rotation speed of either the impression cylinder or the plate cylinder. The dampening device group changes the rotation speed of the drive motor in a non-linear manner including the bias amount, strengthening amount, and gain with respect to the rotation speed of either the impression cylinder or the plate cylinder, and The liquid supply device for a rotary printing press according to claim 1, wherein the liquid supply device is configured to adjust the power supply voltage of the drive motor using an output signal.