JPS63268645A - Ink film thickness controller - Google Patents

Abstract

PURPOSE:To control the quantity of an ink to be supplied, automatically and speedily, by detecting the quantity of an ink at a checker roller by a sensor, and controlling the quantity of the ink by a controller on the basis of the result of detection. CONSTITUTION:A pair of film thickness sensors 11, 12 are disposed opposite to a checker roller 5. The sensor 11 is opposed to a surface not coated with an ink of the roller 5, whereas the sensor 12 is opposed to a surface coated with the ink of the roller 5. Detection signals from the sensors 11, 12 are sent to an A/D converter 62 of a controller 6 through amplifiers 13, 14, respectively, and are then inputted to a microprocessor 60. The controller 6 is provided with a counter 61 supplied with signals from a controller 63 for a pulse motor 7 and from a rotary encoder 2, and with a display device-setting switch 64 for displaying the detected thickness of an ink film.

Description

Detailed Description of the Invention (Industrial Application Field) This invention continuously measures the ink film thickness of a printing press,
This invention relates to an ink film thickness control device.

(Prior Art) Conventionally, the amount of ink supplied to a printing press has been determined by checking the printed material while printing, and manually adjusting the amount of ink supplied accordingly. For this reason, there is a problem in that it takes a lot of time and effort to adjust, and moreover, many useless prints are produced until the amount is adjusted to the appropriate amount.

(Objective of the Invention) This invention was made to eliminate such conventional drawbacks, and it continuously detects the ink supply layer,
To provide an ink thickening adjustment device which automatically adjusts the ink supply R, thereby facilitating the adjustment and preventing wasteful printing.

(Structure of the Invention) The present invention provides a checker roller consisting of one of the backs of a plurality of rollers that conveys and supplies ink from an ink fountain to a printing cylinder, and a surface of the checker roller to which ink is not applied. A sensor that measures the distance from the sensor to the surface on which ink is applied, and a controller that receives signals from the sensor to determine the film thickness, and increases or decreases the ink supply when the value is out of a predetermined range. It has the following.

The above-mentioned sensor may be constituted by a pair of sensors arranged opposite to each other on the ink-applied side and the ink-unapplied side of the checker 0-la. Also,
The above sensor may be configured as a single sensor so as to measure the checker roller at the same position before and after the ink is applied.

In the above configuration, the amount of ink being supplied to the plate cylinder is detected by a sensor at the checker roller, and based on the detection result, the controller reduces the amount of ink supplied to the plate cylinder. lJ III is made.

(Example) In Fig. 1, the rotating shaft of the plate cylinder 1 has 〇-
A tarry encoder 2 is attached, and a printing plate cylinder (not shown) is connected to the plate cylinder 1. Further, an ink fountain roller 31 is arranged so that ink is supplied by the ink fountain 3, and this ink fountain roller 31 rotates intermittently, and the amount of rotation (angular displacement) each time is adjusted to increase or decrease by operating the clutch mechanism 38. is configured to be Therefore, the amount of ink transferred is determined by the amount of one rotation of this intermittent rotation.

The ink duct roller 4 is swingably arranged so as to contact the ink fountain roller 31 and the ink vibrator roller 32 alternately. The ink vibrator 0-ra 32 &: is in contact with the roller 33 for ink, and the ink vibrator 0-ra 34 in order, and further branches from the ink vibrator roller 34 and one is connected to the blade cylinder 1 through the ink vibrator 0-ra 37,
The other one is from the inking roller 35 to the checker roller 5,
The ink vibrator roller 368 and other ink rollers are connected to the plate cylinder 1 to transport and supply ink through the rollers, respectively.

Further, a slider 7 is attached to the rotating screw shaft 70 of the pulse motor 7.
1 is attached, and this slider 71 can increase or decrease the amount of rotation of the ink fountain roller 31 via the clutch mechanism 38. The ink duct roller 4 is oscillated by the drive source of the plate cylinder 1 in response to the rotation of the plate cylinder 1, and is brought into contact with either the ink fountain roller 31 or the ink vibrator roller 32, or at a neutral position where it does not come into contact with either of them. oscillate so that

A pair of film thickness detection sensors 11 and 12 are arranged at positions facing the checker roller 5, and as shown in FIG. 12 each face a surface 52 to which ink is applied.

The detection signals from the sensors 11, 12 are respectively passed through amplifiers 13, 14 to A/D conversion l! of the controller 6.
62 and input to the microprocessor 60. The controller 6 also has a pulse motor 7.
A counter 61 to which a signal from the O-Tari encoder 2 is input, and a display setting switch 64 for displaying the detected ink film thickness are provided.

Next, the operation of this device will be explained. When the printing machine is driven, each roller rotates, but the ink duct roller 4 is in a neutral position and maintains a state in which it does not come into contact with either the ink fountain roller 31 or the ink vibrator roller 32.・For this reason, ink is not transported. As shown in FIG. 4, before the mark w41til starts, the distance La between the sensor 11.12 and the surface 51.52 of the checker 0-5 is determined by the sensor 11.12 in step S1.
, Lb are measured respectively, and the sensor amplifier 13
．． 14 from the A/D converter 62 to the microprocessor 60 as a detection signal. At this time, ink is not being supplied to the surface 52 to which ink is applied.

Next, in step S2, the average 11T of the difference in distance between the two (La-Lb) is determined. This step S1, step $2
These operations are repeated until the zero point is set by a zero point setting switch (not shown) provided on the controller 6 (step S3).

When the zero point setting switch is turned on, the process moves from step S3 to step S4, where the average value T is stored as the zero point Tφ in the microprocessor 60, and the operations from step $1 to step S4 are repeated.

Next, as shown in FIG. 5, distances 1-a, 1 . The measurement of b and the calculation of the average value in step S@ are carried out in the same manner as above, and in step S7 the difference TC between this average value ``'' and the zero point value Tφ stored in step S4 is calculated at the measurement point. , is calculated as the film thickness.In the first flow, no ink is supplied, so the film thickness is zero, and then in step S8, the preset minimum film thickness TQ and the above measured value are calculated. The film thickness is compared with the film thickness TC, and since the film thickness is O in this case, the process moves to step S9, where an ink supply command is issued, that is, the duct roller 4 is driven, and the rotation amount of the fountain 0-ra 31 is set in step 5II. Slider 71 is operated until the value is reached.

As a result, a predetermined amount of ink is supplied from the ink fountain 3 to the ink fountain roller 31, and this ink is supplied from the ink duct roller 4 to the ink vibrator roller 3.
2.34, and from there it is transferred to the plate cylinder 1 through the ink vibrator 0-ra 37, and the ink is transferred from the roller 35 to the checker roller 5.
, is transferred to the plate cylinder 1 through the ink vibrator roller 36.

During this time, it is determined in step S8 that the film thickness TC is the minimum value TQ.
If it is smaller than step S5 in FIG.
The flow up to a is repeated, and if the film thickness TC becomes greater than the minimum value TQ, a signal indicating that printing is possible is output.

When a predetermined amount of ink is supplied and a signal indicating that printing is possible is issued according to the flow shown in FIG. 5, the process moves to the flow shown in FIG. 6. Here, from step S11 to step S
13, distance 111L by sensor 11°12 as above
a, Lb are measured, the average value T is calculated, and the difference Tc between this average value ■ and the above-mentioned stored zero point value °rφ is calculated,
Next, in step S14, it is determined whether or not it is the control 1 period. This control lvI period is set in consideration of the time it takes for the effect to reach the plate cylinder after the ink increase/decrease control described below is performed, that is, the time for ink to reach the plate cylinder from the ink fountain 0-31. If this time is 3 seconds, for example, the control timing may be set every 3 seconds.

If the 1+1jim period has not been reached, step S11
The flow from step S% is repeated, and when the control time is reached, the deviation ΔTi is determined in step S15 using the following formula.

ΔTi=Tc-(Tu+TQ)/2 Tu: Upper limit value of the film thickness of the checker roller 55 Tp: Lower limit value of the film thickness of the checker roller 5 Therefore, the deviation ΔT1 is the actual (detected) film thickness from the best film thickness. It shows how far off you are.

Next, in step 5IIl, based on the deviation ΔTi, control lll1w is calculated using a predetermined differential coefficient and an integral coefficient, taking into account the variation lJ amount and accumulation amount of the deviation, and in step S17, the pulse motor controller 63 of FIG. A control signal is outputted via the pulse motor 7 to rotate the pulse motor 7 by a predetermined amount to control the increase/decrease of the ink supply l. Note that if the effect of υll1l is not appropriate, it can be adjusted by changing the differential coefficient and integral coefficient.

By repeating the operations from step S11 to step Sv, the ink supply amount is controlled so that an appropriate amount of ink is always supplied to the plate cylinder during printing.

FIG. 3 shows another example of the film thickness detection section, in which a film thickness detection sensor 10 is arranged only in the part of the checker roller 5 facing the surface 11i1i52 where ink is applied, and this sensor 10 is used to apply ink to the surface 52. Before and after application are detected, and the signals are sent to the A/D converter 62 of the controller 6 through the sensor amplifier 15.

In the case of this device, the measurement of a and Lb in the flowcharts of FIGS. 4 to 0 is performed using a rotary encoder 55 directly connected to the checker roller 5, with one being the detected value before ink application and the other being the detected value after ink application. Accordingly, each rotation angle of the checker roller 5 is O0, 10@, 20″, 30°, etc.
. . . The detected values at each - position may be determined, and the detected values before ink application may be stored, and the other operations may be performed in the same manner.

In the above embodiment, the ink fountain roller 31 is adjusted by the pulse motor 7, but it is also possible to use a normal motor.

(Effects of the Invention) As explained above, the present invention detects ink defects in the checker roller while being supplied to the plate cylinder of the printing press, and based on the detection results, the controller supplies the ink to the plate cylinder. The amount of ink supplied is controlled to increase or decrease, and the amount of ink supplied is continuously detected1 before printing, and the amount of ink supplied is automatically adjusted, making adjustment easy and selective. The printing is done quickly and no unnecessary printing occurs.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an apparatus showing an embodiment of the present invention, FIG. 2 is an enlarged explanatory diagram of the checker roller section, and 3rd W4
is a diagram corresponding to FIG. 2 showing another embodiment, and FIGS. 4 to 6 are flowcharts showing operations before mark 1, starting printing, and during printing. 1...Plate cylinder, 3...Ink fountain, 4.
... Ink duct roller, 5... Checker roller,
6... Controller, 10.11.12... Film thickness detection sensor.

Claims (1)

[Scope of Claims] 1. A checker roller that is one of a plurality of rollers that transport and supply ink from an ink fountain to a plate cylinder in a printing press, and a surface of the checker roller that is not coated with ink and ink. A sensor that measures the distance from the sensor to the coated surface, and a controller that receives signals from the sensor, calculates the film thickness, and controls the supply of ink to increase or decrease when the value is out of a predetermined range. An ink film thickness control device comprising: 2. The sensor according to claim 1, wherein the sensor comprises a pair of sensors arranged opposite to each other on the ink-applied surface and the ink-unapplied surface of the checker roller. Ink film thickness control device. 3. Claim 1, characterized in that the sensor is constituted by a single sensor so as to measure the checker roller at the same position before and after the ink is applied. The ink film thickness control device described above.