JPH11105256A - Method for controlling film thickness of ink and equipment for ink supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of spoilage on the occasion when a minimum ink film thickness needed in printing is formed on an ink roller group. SOLUTION: In a web rotary press, a main machine is operated in a state wherein paper feed is stopped with paper left as it is (points t5-t9), after an impression plate is set. In the course of this operation of the main machine, the opening of all ink fountain keys is made 50% and the amount of rotation of an ink fountain roller 50%, and then an ink ductor is made to conduct a leading operation by a set number of times (e.g. 5 times). Thereby a minimum ink film thickness needed in printing is formed on an ink roller group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an ink film thickness in a web rotary printing press for supplying ink in an ink fountain to a printing plate via an ink roller group and an ink supply apparatus.

[0002]

2. Description of the Related Art FIG. 7 shows a main part of an ink supply device in a web-fed rotary printing press. In the figure, 1 is an ink fountain,
Reference numeral 2 denotes ink stored in the ink fountain 1, reference numeral 3 denotes an ink fountain roller, and reference numerals 4 (4-1 to 4-n) denote ink fountain keys provided in parallel in the axial direction of the ink fountain roller 3. Reference numeral 5 denotes an ink transfer roller. , 6 is an ink roller group, 7 is a printing plate, 8
Denotes dampening water, 9 denotes a water supply roller group, 10 denotes a plate cylinder, 11, 12
Denotes a blanket cylinder, and 13 denotes a web (printing paper: wrapping paper).

In this ink supply device, the ink 2 in the ink fountain 1 is supplied to the ink fountain roller 3 by adjusting the opening of the ink fountain keys 4-1 to 4-n, and the ink supplied to the ink fountain roller 3 is transferred to the ink. The ink is supplied to the printing plate 7 through the ink roller group 6 by the operation of calling the roller 5. Simultaneously with the ink supply, the dampening water 8 is supplied to the printing plate 7 via the water supply roller group 9.

In the web-fed rotary printing press, when setting the printing plate 7, after setting the printing plate 7, the web 13 is stretched by passing through the paper. Then, the main printing data such as the opening degree of the ink fountain keys 4-1 to 4-n, the rotation amount of the ink fountain roller 3, and the supply amount of the dampening water 8 is preset to a value corresponding to the pattern of the printing plate 7. Thereby, the ink fountain keys 4-1 to 4-1
4-n opening degree, rotation amount of the ink fountain roller 3, dampening water 8
The ink 2 in the ink fountain 1 is supplied to the printing plate 7 via the ink roller group 6 by setting the supply amount of the printing plate 7 to a value corresponding to the pattern of the printing plate 7.
And the dampening water 8 is supplied to the printing plate 7 via a water supply roller group 9. In this case, test printing is performed before final printing to adjust the ink supply amount and obtain a satisfactory color tone. Thus, a desired ink film thickness distribution (gradient of ink film thickness) is created in the ink roller group 6.

[0005]

However, in such a conventional ink supply device, when the ink roller group 6 does not hold ink, after the printing plate 7 is set, the ink roller group 6 , The ink film thickness distribution for the printing plate 7 must be formed, and it takes time until the ink film thickness distribution is brought into an equilibrium state. Waste of materials ",
Problems such as “decrease in production efficiency” and “cost increase” occur.

In order to create an ink film thickness distribution corresponding to the pattern of the printing plate 7 on the ink roller group 6, the applicant of the present invention considers that the ink roller group 6 has no ink.
The opening of all the ink fountain keys is set to a predetermined opening (for example, 50
%), The amount of rotation of the ink fountain roller 3 is set to a predetermined amount (for example, 50%), the machine is operated, and the ink transfer roller 5 is called up a predetermined number of times (for example, five times). After forming the minimum ink film thickness required during printing on the ink roller group 6, it is considered to superimpose an ink film thickness distribution according to the pattern of the printing plate 7 on this ink film thickness. However, in this method, when forming the minimum ink film thickness required during printing on the ink roller group 6, the paper is fed by operating this machine, and the fed paper is thereby damaged. There is a problem that it becomes paper.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to form a minimum ink film thickness required for printing on an ink roller group during printing. An object of the present invention is to provide an ink film thickness control method and an ink supply device that do not generate paper.

[0008]

In order to achieve the above object, the present invention provides a method of forming an ink film thickness distribution according to the pattern of a printing plate on an ink roller group. If not, the machine is operated with the paper feed stopped while the paper is being passed through, so that the minimum ink film thickness required during printing is formed on the ink roller group. According to the present invention, when the ink roller group does not hold ink, the machine is operated in a state where the paper feed is stopped while the paper threading state is maintained, and the minimum ink film thickness required during printing is performed. Are formed on the ink roller group.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 2 is a diagram showing the overall configuration of a web-fed rotary printing press to which the present invention is applied.

In the figure, 21 is a splicer, 22 is an in-feed, 23 (23-1 to 23-4) is a printing unit, 24 is a dryer, 25 is a cooling unit, 26 is a folding machine, 27 is a main motor, 28 Is a print unit drive shaft that is rotationally coupled to the main motor 27, 29 is a main clutch, 30 is a folder drive shaft that is connected to the print unit drive shaft 28 via the main clutch 29, and 31 is a rotation of the print unit drive shaft 28. A resolver (encoder) for transmitting a pulse signal according to the amount (the rotation amount of the machine), 32 is a sequencer, 33 is a touch panel, and 34 is a PQC (ink supply amount control device). The inside of the printing unit 23 has the same configuration as that of FIG.

Note that the sequencer 32 has a
A main motor drive signal is sent to the main motor 27, an inking roller attaching / detaching signal is sent to the printing unit 23, a clutch attaching / detaching signal is sent to the main clutch 29, and a nip roller attaching / detaching signal is sent to the infeed 22. . Further, the PQC 34 sends a blade opening amount and an ink feed amount (a rotation amount of the ink fountain roller) to the printing unit 23.

A description will be given of a characteristic operation of the web rotary printing press at the time of setting a printing plate, together with functions of the sequencer 32, the touch panel 33 and the PQC 34.

[Pre-inking 1] Now printing unit 2
3 (23-1 to 23-4), the ink roller group 6
Has no ink, and the printing plate 7 is set on the plate cylinder 10.

In this case, the operator operates the touch panel 3
In step 3, "pre-inking 1" is selected. As a result, a start command for pre-inking 1 is issued from the touch panel 33 to the sequencer 32 (FIG. 5B).
Step 501). The sequencer 32 that has received the start command reads the base data for forming the minimum ink film thickness required during printing on the ink roller group 6 from the PQC 34 (step 502), and reads the read base data. Printing unit 2 via PQC34
3 is preset (step 503). In this embodiment, in the printing unit 23, the opening of all the ink fountain keys 4 is set to 50%, and the rotation amount of the ink fountain roller 3 is set to 50%.

On the other hand, the operator sets the printing plate 7 on the plate cylinder 10 (step 504 shown in FIG. 5A: FIG. 1).
(Points t1 to t2 shown in (f)). Then, after setting the plate, the web 13 is threaded to stretch the web 13 (step 50).
5: t3 to t4 points shown in FIG. 1 (f)). In this case, the plate cylinder 10 and the blanket cylinders 11 and 12 are in a detached state.

After the paper threading, the operator operates the touch panel 33 to release the main clutch 29 and release the nip roll in the infeed 22 (step 506: t5 shown in FIG. 1A).
point). As a result, the connection between the printing unit drive shaft 28 and the folding machine drive shaft 30 is disconnected, and the paper drawing function of the web 13 toward the folding machine 26 due to the rotation of the main motor 27, that is, the paper feeding function is shut off.

[Pre-Inking 1-Step 1] Then, the operator instructs the start of "Step 1 of Pre-Inking 1" from the touch panel 33 (Step 50).
7). The sequencer 32 receives the start command of the step 1 of the pre-inking 1, confirms that the presetting of the background data in the step 503 is completed (step 508), and sets the main motor 27 from a low speed (step 509). High speed (Step 510: 100 rpm)
And the ink feeding roller 5 is put on (step 511: point t6 shown in FIG. 1C).

The sequencer 32 calls the ink transfer roller 5 a set number of times (for example, five times) (step 512), and waits for a predetermined time (step 51).
3) Stop the main motor 27 (step 51)
4: t7 point shown in FIG. 1 (b)). As a result, the minimum ink film thickness Ma required during printing is formed in the ink roller group 6 (see FIG. 4A).

The ink film thickness Ma applied to the ink roller group 6
In the present embodiment, the main clutch 29
Is cut off, the nip roller in the infeed 22 is detached, and the paper feeding function is shut off, that is, the web 13 is kept stopped without being fed regardless of the operation of the machine. However, the problem that waste paper occurs does not occur.

[Pre-inking 1-Step 2]
When the ink calling operation is completed in Step 512, the sequencer 32 performs “Step 2 of pre-inking 1”.
Is issued (step 515). On the basis of this command, the sequencer 32 sends a booklet such as the opening degree of the ink fountain keys 4-1 to 4-n, the rotation amount of the ink fountain roller 3, and the supply amount of dampening water 8 from the PQC 34 to the pattern of the printing plate 7. The print data is read (step 516), and the read final print data is transferred to the print unit 23 via the PQC 34.
Is preset (step 517).

After stopping the main motor 27 in step 514, the operator slows down the main motor 27 (step 518: point t8 shown in FIG. 1 (f)). When the main motor 27 is slowly moved, the sequencer 32 engages the main clutch 29 and wears the nip roller in the infeed 22 (step 519: FIG. 1).
(Point t9 shown in (a)). As a result, the printing unit drive shaft 28 and the folder drive shaft 30 are connected, and the paper drawing function of the web 13 toward the folder 26 accompanying the rotation of the main motor 27, that is, the paper feed function, is restored. It should be noted that the sheet is discharged from the folding machine 26 by this loose movement, and adjustment is performed.

After the recovery of the paper feeding function, the operator operates the main motor 27 at a low speed (step 520: point t10 shown in FIG. 1 (f)). During the low-speed operation, the sequencer 32 confirms that the presetting of the final printing data in step 517 has been completed (step 521), and waits for the generation of the dryer temperature completion signal from the dryer 4 (step 522). ), The speed increase is started at a predetermined gentle inclination (step 523: point t11 shown in FIG. 1 (f)). At the same time as the start of the speed increase, the water supply roller of the water supply roller group 9 is put on (step 5).
24: t11 shown in FIG. 1 (e)).

The sequencer 32 measures the amount of rotation of the plate cylinder 10 after the start of the speed increase, based on the signal from the resolver 31. That is, the rotation amount of the plate cylinder 10 from the point t11 shown in FIG. 1 is measured, and when the measured rotation amount reaches S1, the plate cylinder 10 and the blanket cylinders 11 and 12 are put on (step 525: FIG. At t12 shown in d), the cylinder is inserted. Also, the rotation amount of the plate cylinder 10 from the point t11 is measured,
When the measured rotation amount reaches S2 (S2> S1),
The ink feeding operation is started (step 526: FIG. 1).
(Point t13 shown in (c)). Then, after the ink feeding operation has been performed a set number of times (step 527: point t14 shown in FIG. 1C), the rotation amount of the plate cylinder 10 becomes S3 (S3> S2).
Is reached, the inking roller is put on (step 528: point t14 shown in FIG. 1A).

By the ink feeding operation (step 2 of pre-inking 1) from the time point t13 to the time point t14, the minimum ink film thickness Ma required during printing formed on the ink roller group 6 is calculated as follows. (FIG. 4 (a)) The ink film thickness distribution Mb according to the pattern of the printing plate 7 is superimposed (FIG. 4 (b)). And the sequencer 32
When a predetermined printing speed is reached after the inking roller is worn in step 528, the speed increase is completed (step 52).
9: t15 point shown in FIG. 1 (f)).

In this embodiment, the rotation amounts S1, S2 and S3 in step 2 of pre-inking 1 are automatically determined from the printing start speed and the pre-inking amount input from the touch panel 33 as described later. Can be In this case, the printing start speed is empirically determined in consideration of a tension variation with respect to the web 13 and a printing situation. That is, since there is a possibility that the paper may be cut at a high speed or a low speed, the insertion at the point t12 is performed at a timing when there is no risk of the paper being cut, and even if the speed is increased to the printing speed, the influence on the printed matter is increased. The printing start speed is determined so that proper printing is started at the lowest possible speed point where there is not much. As a result, it is possible to minimize the occurrence of broke after starting the operation, that is, the generation of broke from the point t8, and to start printing, and thereafter, the operator views the printed matter. Even if the fine adjustment is made, the printing speed can be increased almost as it is, so that the occurrence of waste paper is reduced.

[Ink Removal] In the printing unit 23 (23-1 to 23-4), the printing plate 7 is replaced with a new printing plate 7 '. In this case, the operator
A deceleration button is pressed on the touch panel 33 (Step 301 shown in FIG. 3). Thus, the deceleration stop signal is turned on (step 302), and the deceleration of the main motor 27 is started (step 303: t shown in FIG. 1 (f)).
16 points).

The sequencer 32 starts detecting the rotation amount of the plate cylinder 10 based on the signal from the resolver 31 at the same time when the deceleration stop signal is turned on in step 302 (step 3).
04). That is, the plate cylinder 10 from the point t16 shown in FIG.
The rotation amount of the ink feeding roller 5 is started when the measured rotation amount reaches S4 (step 305).
Is stopped (steps 306 and 307:
(Point t17 shown in FIG. 1C).

When the rotation amount of the plate cylinder 10 from time t16 reaches S5 (S5> S4) (step 308), the ink forming rollers in the ink roller group 6 are removed (steps 309 and 310: FIG. 1 (b) point t18). At the same time, the plate cylinder 10 and blanket cylinders 11 and 12 are removed (steps 311, 312 and 313: FIG. 1D).
(T18 point shown), the body is removed.

In this case, at time t16, the ink roller group 6 includes the ink film thickness distribution Mb corresponding to the pattern of the printing plate 7.
(See FIG. 4B). FIG.
In (b), Ma is the minimum ink film thickness required during printing, and Mb is in a form superimposed on the ink film thickness Ma.

When the calling operation of the ink transfer roller 5 is stopped at time t17, the supply of the ink to the ink roller group 6 is interrupted. If printing is performed while decelerating in this state, the ink on the ink roller group 6 is consumed,
The ink film thickness gradually decreases. At time t18 when the rotation amount of the plate cylinder 10 reaches S5, the ink roller group 6
The ink film thickness distribution Mb corresponding to the pattern of the printing plate 7 is removed from the above, and the minimum ink film thickness distribution Ma ′ required during printing, which becomes thinner from upstream to downstream, is left (FIG. 4 ( c)). At this time, the cylinder is removed at the same time as the removal of the ink forming roller, and the ink removing started at time t17 ends at time t18 (step 314).

The sequencer 32 removes the water supply roller when the speed of the main motor 27 reaches a predetermined low speed after the body is removed at time t18 (FIG. 1).
(T19 point shown in (e)). At the point t19, the distribution of the ink film thickness on the ink roller group 6 is made flat by the rotation from the point t18, and the minimum ink film thickness Ma required during printing as shown in FIG. Becomes After the main motor 27 reaches a predetermined low speed, the operation is stopped at the point t20.

In the present embodiment, the rotation amounts S4 and S5 at the time of ink removing are automatically determined from the printing end speed and the ink removing amount input from the touch panel 33 as described later. In this case, the end speed of the ink removing is determined by the web 13.
It is determined empirically in consideration of tension fluctuations and the like. That is, since there is a possibility that the paper may be cut at a high speed or a low speed, the end speed of the ink removing is determined so that the cylinder is removed at the point of time t18 at a timing when there is no risk of the paper being cut.

A method of detecting the rotation amount of the plate cylinder at the time of increasing the speed and controlling the "adhesion" timing of the ink feeding roller and the ink application roller will be described below. Set the machine acceleration time to t (sec.
), And assuming that the printing speed is V (rpm) (see FIG. 6), the acceleration gradient a is as follows. a = V / t (rpm / sec) (1)

As shown in FIG. 6, in the case of automatic operation, the plate cylinder rotation amount until the start of printing can be expressed by the following equation. ΔS (plate cylinder rotation amount) = (Δt * ΔV) / 2 + Δt * V1 = {(t2-t1) * (V2-V1)} / 2+ (t2-t1) * V1 = (t2-t1) * (V2 + V1) / 2 (2) From equation (1), since t2-t1 = (V2-V1) / a, ΔS (plate cylinder rotation amount) = ｛(V2-V1) * (V2
+ V1)｝ / 2a.

In general, V1 is fixed, so that if A (rpm) is used, if the printing start speed V2 and the pre-inking amount B are given, the plate cylinder rotation amount until the arrival timing of the ink feeding roller is given by the following equation. The setting is automatically completed by the arithmetic processing. Sd = ΔS−B = [{(V2−A) * (V2 + A)} / 2a] −B (3) At this time, the rotation amount up to the application timing of the ink application roller is Sd ′ = ΔS = [{(V2-A) * (V2 + A)}
/ 2a].

As described above, by inputting the printing start speed V2 and the pre-inking amount B, the application timing of the ink application roller and the ink supply roller can be accurately controlled. Therefore, the required amount of ink is supplied in an appropriate amount immediately after loading, and the result is that waste paper is minimized.

At the time of ink removing, as in the case of pre-inking 1 (step 2), the removal timings of the ink forming roller and the ink feeding roller are obtained by the above-described equations. In this case, the printing start speed V
The printing end speed is used instead of 2, and the removing amount is used instead of the pre-inking amount.

[0038]

As is apparent from the above description, according to the present invention, when the ink roller group does not hold ink, the apparatus is operated in a state where the paper feed is stopped while the paper is being threaded. The minimum ink film thickness required during printing is formed on the ink roller group, and the paper feed is performed during the formation of the minimum ink film thickness required during printing on the ink roller group. This is not performed, and the problem that waste paper occurs during this time is eliminated.

[Brief description of the drawings]

FIG. 1 is a time chart for explaining a characteristic operation (pre-inking 1 (step 1 and step 2) operation) at the time of plate setting in the web-fed rotary press shown in FIG.

FIG. 2 is a view showing the overall configuration of a web-fed rotary printing press to which the present invention is applied.

FIG. 3 is a flowchart for explaining an ink removing operation during deceleration at the time of plate change in the web-fed rotary printing press.

FIG. 4 is a diagram showing a change in an ink film thickness distribution on an ink roller group.

FIG. 5 is a flowchart for explaining a pre-inking 1 operation during speed increase during plate setting in the web-fed rotary printing press.

FIG. 6 is a time chart for explaining a method of detecting the rotation amount of the plate cylinder at the time of increasing the speed and controlling the “wearing” timing of the ink feeding roller and the ink forming roller.

FIG. 7 is a diagram illustrating a main part of an ink supply device in a web-fed rotary printing press.

[Explanation of symbols]

1: Ink fountain, 2: ink, 3: ink fountain roller,
4 (4-1 to 4-n): ink fountain key, 5: ink transfer roller, 6: ink roller group, 7, 7 '... printing plate, 8 ...
Dampening solution, 9: water supply roller group, 10: plate cylinder, 11, 12 ...
Blanket cylinder, 13: web (printing paper: rolled paper), 21: splicer, 22: infeed, 23 (23-1 to 23-)
4) Printing unit, 24 Dryer, 25 Cooling, 26 Folding machine, 27 Main motor, 28 Printing unit drive shaft, 29 Main clutch, 30 Drive unit drive shaft, 31 Resolver (encoder) , 32 ... sequencer, 33 ... touch panel, 34 ... PQC (ink supply amount control device).

Claims (2)

[Claims] An ink fountain key is provided, ink in the ink fountain is supplied to an ink fountain roller by adjusting the opening degree of the ink fountain key, and the ink supplied to the ink fountain roller is transferred to the ink fountain roller, and the ink roller group is operated by a call operation of the roller. In an ink supply device of a rotary web press for supplying to a printing plate via an ink supply device, when forming an ink film thickness distribution according to the pattern of the printing plate on the ink roller group, the ink roller group does not hold ink. An ink which is operated in a state where the paper feed is stopped in a state where the paper is passed through, and a minimum ink film thickness required during printing is formed on the ink roller group. How to control film thickness. 2. An ink fountain key is provided, a plurality of ink fountain keys are provided, ink in the ink fountain is supplied to the ink fountain roller by adjusting the opening degree of the ink fountain key, and the ink supplied to the ink fountain roller is transferred to the ink fountain roller. In an ink supply device of a rotary web press for supplying to a printing plate via an ink supply device, when forming an ink film thickness distribution according to the pattern of the printing plate on the ink roller group, the ink roller group does not hold ink. Means for operating the apparatus in a state where the paper feed is stopped while the paper is being passed, and forming a minimum ink film thickness required for printing on the ink roller group during printing. Ink supply device.