JP4275757B2 - Ink film thickness control method and ink supply apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink film thickness control method and an ink supply apparatus in a web-fed rotary printing press that supplies ink in an ink fountain to a printing plate via an ink roller group.
[0002]
[Prior 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, 2 is ink stored in the ink fountain 1, 3 is an ink fountain roller, 4 (4-1 to 4-n) are provided in parallel in the axial direction of the ink fountain roller 3. Ink fountain keys, 5 is an ink transfer roller, 6 is an ink roller group, 7 is a printing plate, 8 is a dampening solution, 9 is a water supply roller group, 10 is a plate cylinder, 11 and 12 are rubber cylinders, and 13 is a web (printing paper). : Wrapping paper).
[0003]
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 supplied to the ink transfer roller 5 The ink is supplied to the printing plate 7 through the ink roller group 6 by a calling operation. In parallel with this ink supply, the dampening water 8 is supplied to the printing plate 7 via the water supply roller group 9.
[0004]
In the web rotary press, when the printing plate 7 is set, the printing plate 7 is set, and then the web 13 is stretched through the paper. Then, 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 are preset to values corresponding to the pattern of the printing plate 7. As a result, the ink 2 in the ink fountain 1 is set so that 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 are values corresponding to the pattern of the printing plate 7. A fountain solution 8 is supplied to the printing plate 7 via the ink roller group 6, and a fountain solution 8 is supplied to the printing plate 7 via the water supply roller group 9. In this case, a trial printing is performed before the main printing, the ink supply amount is adjusted, and a satisfactory color tone is obtained. Thereby, a desired ink film thickness distribution (gradient of ink film thickness) is created in the ink roller group 6.
[0005]
[Problems to be solved by the invention]
However, in such a conventional ink supply apparatus, when the ink roller group 6 does not hold ink, after setting the printing plate 7, the ink film thickness distribution with respect to the printing plate 7 from the beginning with respect to the ink roller group 6. It takes time to bring the ink film thickness distribution to an equilibrium state, and “Increased pre-printing time”, “Increased labor load”, “Waste of printing materials”, “Production efficiency” Problems such as “decrease” and “cost increase” occur.
[0006]
Therefore, the applicant of the present invention, when creating an ink film thickness distribution corresponding to the pattern of the printing plate 7 on the ink roller group 6, when the ink roller group 6 does not hold ink, opens the opening of all ink fountain keys. The degree of rotation (for example, 50%) and the amount of rotation of the ink fountain roller 3 are set to a predetermined amount (for example, 50%), the machine is operated, and the ink transfer roller 5 is rotated a predetermined number of times (for example, 5 times). ) After calling the ink roller group 6 to form the minimum ink film thickness required during printing, the ink film thickness distribution corresponding to the pattern of the printing plate 7 is superimposed on the ink film thickness. I am thinking.
However, in this method, when the minimum ink film thickness required during printing is formed on the ink roller group 6, paper feeding is also performed by operating this machine, and the paper fed thereby is damaged. The problem of becoming paper occurs.
[0007]
The present invention has been made in order to solve such problems. The object of the present invention is to cause a loss of paper when forming the minimum ink film thickness required during printing on the ink roller group. An object of the present invention is to provide an ink film thickness control method and an ink supply device.
[0008]
[Means for Solving the Problems]
In order to achieve such an object, in the present invention, when an ink film thickness distribution corresponding to the pattern of the printing plate is formed in the ink roller group, the ink roller group remains in a paper threaded state when it does not hold ink. The machine is operated with the paper feed stopped, and the minimum ink film thickness required during printing is formed on the ink roller group. After this ink film thickness is formed, the speed of the printing machine is increased. The ink film thickness distribution corresponding to the pattern of the printing plate is superimposed on the inside .
According to this 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 is being passed through, and the minimum ink film thickness required during printing is determined. Are formed in the ink roller group. Then, after the ink film thickness is formed, the ink film thickness distribution corresponding to the pattern of the printing plate is superimposed during the speed increase of the printing press.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
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.
[0010]
In the figure, 21 is a splicer, 22 is in-feed, 23 (23-1 to 23-4) is a printing unit, 24 is a dryer, 25 is cooling, 26 is a folding machine, 27 is a main motor, and 28 is a main motor. 27 is a main unit clutch, 30 is a folding machine driving shaft connected to the printing unit driving shaft 28 via the main clutch 29, and 31 is a rotation amount of the printing unit driving shaft 28 (main shaft). A resolver (encoder) for sending out a pulse signal corresponding to 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 in FIG.
[0011]
As will be described later, the sequencer 32 infeeds the main motor drive signal to the main motor 27, the ink form roller attachment / detachment signal to the printing unit 23, and the clutch attachment / detachment signal to the main clutch 29. A nip roller attachment / detachment signal is sent to the controller 22. Further, the PQC 34 sends the blade opening amount and the ink feed amount (rotation amount of the ink fountain roller) to the printing unit 23.
[0012]
A characteristic operation at the time of setting the printing plate in the web rotary printing press will be described with the functions of the sequencer 32, the touch panel 33 and the PQC 34.
[0013]
[Pre-inking 1]
Now, in the printing unit 23 (23-1 to 23-4), the ink roller group 6 is in a state where it does not hold ink, and the printing plate 7 is set on the plate cylinder 10.
[0014]
In this case, the operator selects “pre-inking 1” on the touch panel 33. As a result, a start command for pre-inking 1 is issued from the touch panel 33 to the sequencer 32 (step 501 shown in FIG. 5B). Upon receiving this start command, the sequencer 32 reads the background data for forming the minimum ink film thickness required during printing from the PQC 34 to the ink roller group 6 (step 502). Preset to the printing unit 23 via the PQC 34 (step 503). In this embodiment, in the printing unit 23, the opening degree of all ink fountain keys 4 is 50%, and the rotation amount of the ink fountain roller 3 is 50%.
[0015]
On the other hand, the operator sets the printing plate 7 on the plate cylinder 10 (step 504 shown in FIG. 5A: points t1 to t2 shown in FIG. 1F). Then, after the plate is set, the web 13 is stretched through the web (step 505: t3 to t4 shown in FIG. 1 (f)). In this case, the plate cylinder 10 and the rubber cylinders 11 and 12 are in a detached state.
[0016]
After passing the paper, the operator disengages the main clutch 29 by an operation from the touch panel 33 and removes the nip roll in the infeed 22 (step 506: point t5 shown in FIG. 1A). 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 accompanying the rotation of the main motor 27, that is, the paper feeding function is interrupted.
[0017]
[Pre-inking 1-Step 1]
The operator then commands the touch panel 33 to start “Step 1 of pre-inking 1” (Step 507). The sequencer 32 receives the start command of step 1 of the pre-inking 1 and confirms that the background data preset in step 503 is completed (step 508), and then starts the main motor 27 from the low speed (step 509). The speed is increased to a high speed (step 510: 100 rpm), and the ink calling roller 5 is put on (step 511: point t6 shown in FIG. 1C).
[0018]
The sequencer 32 calls the ink transfer roller 5 a set number of times (for example, 5 times) (step 512), waits for a predetermined time (step 513), and then stops the main motor 27 (step 514: FIG. T7 point shown in 1 (b)). As a result, a minimum ink film thickness Ma required during printing is formed on the ink roller group 6 (see FIG. 4A).
[0019]
In forming the ink film thickness Ma on the ink roller group 6, in this embodiment, the main clutch 29 is disengaged, the nip roller in the infeed 22 is disengaged, and the paper feed function is interrupted. That is, regardless of the operation of this machine, the web 13 is not fed and kept in a stopped state, so that the problem of lost paper does not occur.
[0020]
[Pre-inking 1-Step 2]
On the other hand, when the ink calling operation is completed in step 512, the sequencer 32 issues a start command to “step 2 of pre-inking 1” (step 515). On the basis of this command, the sequencer 32 reads a book 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 according to the pattern of the printing plate 7 from the PQC 34. The printing data is read (step 516), and the read main printing data is preset to the printing unit 23 via the PQC 34 (step 517).
[0021]
After stopping the main motor 27 in step 514, the operator slowly moves the main motor 27 (step 518: point t8 shown in FIG. 1 (f)). When the main motor 27 is slowly moved, the sequencer 32 brings the main clutch 29 into contact and wears the nip roller in the infeed 22 (step 519: point t9 shown in FIG. 1A). As a result, the printing unit drive shaft 28 and the folding machine drive shaft 30 are connected, and the paper drawing function of the web 13 toward the folding machine 26 accompanying the rotation of the main motor 27, that is, the paper feeding function is restored. Note that this slow movement confirms and adjusts the paper discharge on the folding machine 26 side.
[0022]
Then, after the paper feeding function is recovered, the operator operates the main motor 27 at a low speed (step 520: t10 point shown in FIG. 1 (f)). During this low speed operation, the sequencer 32 confirms that the preset of the main printing data in step 517 has been completed (step 521), and waits for generation of a dryer temperature increase completion signal from the dryer 4 (step 522). ), Acceleration is started at a predetermined gentle slope (step 523: point t11 shown in FIG. 1 (f)). Simultaneously with the start of the speed increase, the water supply roller in the water supply roller group 9 is put on (step 524: t11 shown in FIG. 1 (e)).
[0023]
The sequencer 32 measures the amount of rotation of the plate cylinder 10 after starting 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 rubber cylinders 11 and 12 are worn (step 525: FIG. 1 ( At t12 point shown in d), the body is inserted. Further, the amount of rotation of the plate cylinder 10 from the point t11 is measured, and when this measured amount of rotation reaches S2 (S2> S1), the ink calling operation is started (step 526: t13 shown in FIG. 1C). point). After the ink calling operation has been performed a set number of times (step 527: t14 shown in FIG. 1C), when the rotation amount of the plate cylinder 10 reaches S3 (S3> S2), the ink form roller is attached. (Step 528: t14 point shown in FIG. 1A).
[0024]
By the ink calling operation from the point t13 to the point t14 (step 2 of pre-inking 1), the minimum ink film thickness Ma required during printing formed on the ink roller group 6 (FIG. 4 ( a)) The ink film thickness distribution Mb corresponding to the pattern of the printing plate 7 is superimposed (FIG. 4B). Then, the sequencer 32 completes the speed increase after reaching the predetermined printing speed after setting the ink form roller in step 528 (step 529: t15 shown in FIG. 1 (f)).
[0025]
In the present embodiment, the rotation amounts S1, S2, and S3 in step 2 of the pre-inking 1 are automatically determined from the print start speed and the pre-inking amount input from the touch panel 33 as will be described later. In this case, the printing start speed is determined empirically in consideration of the tension variation with respect to the web 13 and the printing status. In other words, there is a possibility of paper breakage at both high speed and low speed, so that the cylinder is inserted at the point t12 at a timing at which there is no fear of paper breakage. The printing start speed is determined so that appropriate printing is started at the lowest possible speed point. As a result, it is possible to minimize the generation of damaged paper after the start of operation, that is, the generation of damaged paper from the point t8, and printing is started. Even if fine adjustment is performed, the printing speed can be increased almost as it is, so that the generation of waste paper is reduced.
[0026]
[Ink removing]
Now, 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 presses the deceleration button on the touch panel 33 (step 301 shown in FIG. 3). As a result, the deceleration stop signal is turned on (step 302), and the deceleration of the main motor 27 is started (step 303: t16 shown in FIG. 1 (f)).
[0027]
The sequencer 32 starts detecting the amount of rotation 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 304). That is, the measurement of the rotation amount of the plate cylinder 10 from the point t16 shown in FIG. 1 is started, and when the measured rotation amount reaches S4 (step 305), the calling operation of the ink calling roller 5 is stopped (step 306). 307: t17 point shown in FIG.
[0028]
When the amount of rotation of the plate cylinder 10 from the point t16 reaches S5 (S5> S4) (step 308), the ink form roller in the ink roller group 6 is removed (steps 309 and 310: FIG. T18 points shown in FIG. At the same time, the plate cylinder 10 and the rubber cylinders 11 and 12 are removed (steps 311, 312, and 313: points t18 shown in FIG. 1 (d)), and the cylinder is removed.
[0029]
In this case, an ink film thickness distribution Mb (see FIG. 4B) corresponding to the pattern of the printing plate 7 is formed in the ink roller group 6 at the point t16. In FIG. 4B, Ma is the minimum ink film thickness required during printing, and Mb is superimposed on the ink film thickness Ma.
[0030]
When the calling operation of the ink transfer roller 5 is stopped at the point t17, the supply of ink to the ink roller group 6 is interrupted. When printing is performed while decelerating in this state, the ink on the ink roller group 6 is consumed, and the ink film thickness gradually decreases. At time t18 when the rotation amount of the plate cylinder 10 reaches S5, the ink film thickness distribution Mb corresponding to the pattern of the printing plate 7 is removed from the ink roller group 6, and during printing that becomes thinner from upstream to downstream. The required minimum ink film thickness distribution Ma ′ is left (see FIG. 4C). At this time, the ink form roller is removed and at the same time, the cylinder is removed, and the ink removal started from the point t17 is completed at the point t18 (step 314).
[0031]
The sequencer 32 removes the barrel at time t18, and then removes the water supply and attachment roller when the speed of the main motor 27 reaches a predetermined low speed (time t19 shown in FIG. 1 (e)). At the point t19, the ink film thickness distribution on the ink roller group 6 is flattened by the rotation from the point t18, and the minimum ink film thickness Ma required during printing as shown in FIG. It becomes. After the main motor 27 reaches a predetermined low speed, the operation is stopped at the point t20.
[0032]
In the present embodiment, the rotation amounts S4 and S5 at the time of ink removal are automatically determined from the print end speed and the ink removal amount input from the touch panel 33 as will be described later. In this case, the end speed of the ink removal is determined empirically in consideration of a tension variation with respect to the web 13. In other words, since there is a possibility that the paper will be cut at both high speed and low speed, the end speed of the ink removal is determined so that the cylinder is removed at the point t18 at a timing at which there is no possibility of paper cutting.
[0033]
A method for detecting the amount of rotation of the plate cylinder at the time of acceleration and controlling the “attaching” timing of the ink calling roller and the ink forming roller will be described below.
Assuming that this machine acceleration time is t (sec) and the printing speed is V (rpm) (see FIG. 6), the acceleration gradient a is given by the following equation.
a = V / t (rpm / sec) (1)
[0034]
As shown in FIG. 6, in the case of automatic operation, the amount of plate cylinder rotation until the start of printing can be expressed by the following equation.
ΔS (rotation amount of plate cylinder) = (Δt * ΔV) / 2 + Δt * V1 = {(t2−t1) * (V2−V1)} / 2+ (t2−t1) * V1 = (t2−t1) * (V2 + V1) / 2 ・ ・ ・ ・ (2)
Since t2−t1 = (V2−V1) / a from Expression (1), ΔS (plate cylinder rotation amount) = {(V2−V1) * (V2 + V1)} / 2a.
[0035]
Since V1 is generally fixed and A (rpm) is assumed, if the printing start speed V2 and the pre-inking amount B are given, the amount of rotation of the plate cylinder until the arrival timing of the ink calling roller is given by the following equation, Setting is completed automatically.
Sd = ΔS−B = [{(V2−A) * (V2 + A)} / 2a] −B (3)
At this time, it goes without saying that the amount of rotation until the ink application roller is applied is obtained as Sd ′ = ΔS = [{(V2−A) * (V2 + A)} / 2a].
[0036]
As described above, if the printing start speed V2 and the pre-inking amount B are input, it is possible to accurately control the landing timing of the ink form roller and the ink call roller. Accordingly, an appropriate amount of ink is supplied immediately after entering the cylinder, resulting in the result that the amount of waste paper is minimized.
[0037]
Also in the case of ink removal, in the same manner as in the case of pre-inking 1 (step 2), the removal timing of the ink form roller and the ink calling roller is obtained by the above-described formula. In this case, the printing end speed is used instead of the printing start speed V2, and the removing amount is used instead of the preinking amount.
[0038]
【The invention's effect】
As is apparent from the above description, according to the present invention, when the ink roller group does not hold ink, the machine is operated in a state in which paper feeding is stopped while the paper is being passed, and is necessary during printing. The minimum ink film thickness is formed in the ink roller group, and paper feeding is not performed during formation of the minimum ink film thickness required during printing on the ink roller group. This eliminates the problem of waste paper generated during this period.
[Brief description of the drawings]
FIG. 1 is a time chart for explaining a characteristic operation (pre-inking 1 (step 1, step 2) operation) when a plate is set in the web rotary printing press shown in FIG. 2;
FIG. 2 is a diagram showing an 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 during plate change in the web-fed rotary printing press.
FIG. 4 is a diagram showing a change in ink film thickness distribution on the ink roller group.
FIG. 5 is a flowchart for explaining a pre-inking 1 operation during speed increase when a plate is set in the web-fed rotary printing press.
FIG. 6 is a time chart for explaining a method of detecting the amount of plate cylinder rotation at the time of acceleration and controlling the “attaching” timing of the ink calling 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]
DESCRIPTION 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 ... Wet Shimizu, 9 ... Water supply roller group, 10 ... Plate cylinder, 11, 12 ... Rubber cylinder, 13 ... Web (printing paper: wrapping 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 ... Folding device drive shaft, 31 ... Resolver (encoder), 32 ... sequencer, 33 ... touch panel, 34 ... PQC (ink supply amount control device).

Claims (4)

A plurality of ink fountain keys are provided, and the ink in the ink fountain is supplied to the ink fountain roller by adjusting the opening degree of these ink fountain keys, and the ink supplied to the ink fountain roller is transferred to the printing plate through the ink roller group by the ink transfer roller calling operation. In the ink supply device of the web-fed rotary printing press to supply
In making the ink film thickness distribution according to the pattern of the printing plate on the ink roller group, when the ink roller group does not have ink, the machine is operated in a state where paper feeding is stopped in a paper threading state. An ink film thickness forming step for driving and forming a minimum ink film thickness required during printing on the ink roller group ;
After the ink film thickness is formed by the ink film thickness forming step, the printing plate is reduced to the minimum ink film thickness required during printing formed in the ink roller group during the speed increase of the printing press. An ink film thickness distribution superimposing step for superimposing the ink film thickness distribution according to the pattern;
Ink film thickness control method, characterized in that it comprises a. A plurality of ink fountain keys are provided, and the ink in the ink fountain is supplied to the ink fountain roller by adjusting the opening degree of these ink fountain keys, and the ink supplied to the ink fountain roller is transferred to the printing plate through the ink roller group by the ink transfer roller calling operation. In the ink supply device of the web-fed rotary printing press to supply
In making the ink film thickness distribution according to the pattern of the printing plate on the ink roller group, when the ink roller group does not have ink, the machine is operated in a state where paper feeding is stopped in a paper threading state. An ink film thickness forming means for operating and forming a minimum ink film thickness required during printing on the ink roller group ;
After the ink film thickness is formed by the ink film thickness forming means, the printing plate is reduced to the minimum ink film thickness required during printing formed on the ink roller group during the speed increase of the printing press. Ink thickness distribution superimposing means for superimposing the ink thickness distribution according to the pattern;
An ink supply device characterized by comprising a. A plurality of ink fountain keys are provided, and the ink in the ink fountain is supplied to the ink fountain roller by adjusting the opening of these ink fountain keys, and the ink supplied to the ink fountain roller is transferred to the printing plate through the ink roller group by the ink transfer roller calling operation. In the ink supply device of the web-fed rotary printing press to supply
In making the ink film thickness distribution according to the pattern of the printing plate in the ink roller group, when the ink roller group does not have ink, the clutch that disconnects and connects the drive of the printing unit and the folding machine is disconnected. At the same time, the nip roll of the in-feed is removed, and the machine is operated with the paper feeding stopped while the paper is being passed through to form the minimum ink film thickness required during printing on the ink roller group. An ink film thickness forming step,
After the ink film thickness is formed by the ink film thickness forming step, the printing plate is reduced to the minimum ink film thickness required during printing formed in the ink roller group during the speed increase of the printing press. An ink film thickness distribution superimposing step for superimposing the ink film thickness distribution according to the pattern;
An ink film thickness control method comprising: A plurality of ink fountain keys are provided, and the ink in the ink fountain is supplied to the ink fountain roller by adjusting the opening of these ink fountain keys, and the ink supplied to the ink fountain roller is transferred to the printing plate through the ink roller group by the ink transfer roller calling operation. In the ink supply device of the web-fed rotary printing press to supply
In making the ink film thickness distribution according to the pattern of the printing plate in the ink roller group, when the ink roller group does not have ink, the clutch that disconnects and connects the drive of the printing unit and the folding machine is disconnected. At the same time, the nip roll of the in-feed is removed, and the machine is operated with the paper feeding stopped while the paper is being passed through to form the minimum ink film thickness required during printing on the ink roller group. An ink film thickness forming means,
After the ink film thickness is formed by the ink film thickness forming means, the printing plate is reduced to the minimum ink film thickness required during printing formed on the ink roller group during the speed increase of the printing press. Ink thickness distribution superimposing means for superimposing the ink thickness distribution according to the pattern;
An ink supply device comprising:

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