JP2011218737A - Automatic control device and control method of ink supplying and squeegee pressing in rotary screen printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for automatically controlling ink supplying and squeeze pressing especially by a current value of a rotary screen driving motor regarding a rotary screen printer.SOLUTION: In the automatic control device and the automatic control method, the current value of the rotary screen driving motor is measured, and the measured current value is compared with a reference current value set in advance, and ink supplying and squeeze pressing is adjusted when the measured current value deviates from the range of the reference current value.

Description

The present invention relates to a rotary screen printing machine, and more particularly, to an automatic control device for ink supply and squeegee pressing by a current value of a rotary screen drive motor, and a control method thereof.

Generally, screen printing is a printing method in which a through-hole through which ink passes and a non-through-hole through which ink does not pass are formed on a printing plate, and ink is pushed out of the through-hole by a squeegee and transferred to a printing material.

Screen printing has the advantage that the plate surface is flexible, the printing pressure is very small, and the ink film is thicker than other plate types, so that the material of the substrate can be freely selected. In addition, there are two types of plate surfaces: a flat type using a flat plate surface and a rotary type using a cylindrical plate surface, and rotary screen printing can print a continuous pattern on a web.

An apparatus using rotary screen printing is called a rotary screen printing machine, and includes a paper feeding unit, a printing unit, and a paper discharge unit. The printed materials are sequentially fed by the paper feeding unit and conveyed to the printing unit. The printing material conveyed to the printing unit is pressed by the impression cylinder and the plate cylinder to be printed. At this time, the ink is supplied to the plate cylinder by discharging ink from an ink supply means provided in the plate cylinder. Further, the ink staying inside the plate cylinder repeatedly moves with the rotation of the plate cylinder, and is pushed into the through hole of the plate cylinder by the squeegee present in the plate cylinder. Then, the ink pressed into the through-hole is pressed by the opposing impression cylinder, whereby printing on the printing material interposed between the plate cylinder and the impression cylinder is performed. Thereafter, the paper is discharged from the paper discharge unit to the outside of the rotary screen printer.

The adjustment of the squeegee pressure and the adjustment of the ink supply in the rotary screen printing machine are important elements for maintaining a stable print quality. Up to now, various ideas have been made for adjusting the squeegee press and adjusting the ink supply.

For example, as a mechanism for adjusting the squeegee pressing, a mechanism is disclosed in which the tip is pressed against the screen plate without bending the squeegee held by the holder. This is because when the squeegee is bent and pressed against the screen plate surface, the pressing force of the squeegee against the screen plate surface is not uniform in the width direction, and the amount of ink pushed out of the screen plate surface by the squeegee differs in the width direction. This is because the thickness of the printed ink layer varies in the width direction of the squeegee and the flatness of the ink layer is deteriorated. There is a technique for limiting the angle or limiting the material of the squeegee (see, for example, Patent Document 1).

In addition, as a mechanism for adjusting the amount of ink supplied in screen printing, a supply unit that supplies ink to a scraper that applies ink to the inner surface of the rotary screen plate and a sensor that detects the amount of ink in the vicinity of the scraper are provided. A mechanism is disclosed in which the supply is appropriately controlled based on the amount of ink detected by a sensor (see, for example, Patent Document 2).

JP 2000-326485 A JP 2006-321100 gazette

However, although the squeegee press adjusting mechanism described in Patent Document 1 can keep the squeegee press in the width direction uniform, it cannot perform fine adjustment of the squeegee press accompanying a change over time. Was to be implemented.

Further, the ink supply amount adjusting mechanism described in Patent Document 2 is concerned about malfunction due to contamination of the sensor head with use.

Until now, the adjustment of the squeegee pressure has been performed by the operator while confirming the print quality. In addition, the adjustment of the ink supply amount is carried out while the operator is checking the remaining amount of ink remaining in the rotary screen by visual observation, and the work is busy. Further, when continuous printing is carried out, the squeegee press and the ink supply amount become unstable, which has an adverse effect on the print quality, and there is a considerable room for improvement.

The present invention aims to solve the problems at the present time, measures the current value of the drive motor of the rotary screen, and compares the measured current value with a preset reference current value. The present invention provides a mechanism for automatically adjusting ink supply and squeegee pressing when the current value deviates from the reference range.

The automatic control device for ink supply and squeegee pressing in rotary screen printing is an automatic control device that automatically controls ink supply and squeegee pressing according to the current value of the rotary screen drive motor in the rotary screen printing machine. Depending on the ink characteristics, the basic current value, setting unit time, ink weight adjustment amount and squeegee push-in adjustment amount corresponding to the ink are stored in advance, and the ink for the set unit time stored in the management unit The ink supply amount is determined based on the weight adjustment amount, the current value of the rotary screen drive motor is compared with the basic current value when the set unit time has elapsed, and the squeegee pressure is controlled based on the comparison result. Control unit for determining the amount of squeegee push-in adjustment for determining Based on, it performs the supply of ink, and having an operation portion for performing indentation of the squeegee.

The automatic control device for ink supply and squeegee pressing in rotary screen printing uses a rotary screen for the basic current value, setting unit time, ink weight adjustment amount and squeegee push-in adjustment amount that the control unit stores in advance in the management unit. Before starting the printing press, data setting means for setting the corresponding basic current value, setting unit time, ink weight adjustment amount and squeegee push-in adjustment amount, and timing for detecting the current value during one rotation of the rotary screen Electronic timing means for setting, a detecting means for detecting a current value generated in the drive motor of the rotary screen at a timing set in the electronic timing means every time the set unit time elapses, and a current value obtained by the detecting means Comparison means for comparing the basic current value, and the set unit time If the basic current value is different from the detected current value as a result of the comparison by the comparison means, the command to adjust the ink supply to the working part is propagated based on the ink weight adjustment amount. And a transmission means for propagating a command for adjusting the amount of squeegee push to the operating unit.

The automatic control device for ink supply and squeegee pressing in rotary screen printing further includes a display unit for displaying a set value in the data setting unit, a detection value in the detection unit, and a comparison result in the comparison unit.

An automatic control method for ink supply and squeegee pressing in rotary screen printing is an automatic control method for automatically controlling ink supply and squeegee pressing by the current value of a rotary screen drive motor in a rotary screen printing machine. Set the basic current value, setting unit time, ink weight adjustment amount and squeegee push-in adjustment amount corresponding to the ink according to the characteristics of the ink used before the operation of the printing machine, and always after the rotary screen printing machine is operated When it is determined whether the unit time has elapsed and it is determined that the set unit time has not elapsed, the rotary screen printing machine continues to operate as it is, and it is determined that the set unit time has elapsed In the ink supply according to the ink weight adjustment amount, After the supply of ink is finished, the current value generated in the drive motor of the rotary screen is compared with the basic current value. If the current value and the basic current value are different, adjustment by pressing the squeegee is performed according to the squeegee pressing adjustment amount. When the current value and the basic current value are the same, it is determined again whether the set unit time has elapsed.

The automatic control method of ink supply and squeegee pressing in rotary screen printing is to compare the current value generated in the rotary screen drive motor with the basic current value again after pressing the squeegee according to the squeegee pressing adjustment amount. The squeegee is pushed according to the squeegee push-in adjustment amount until the current value and the basic current value become the same value.

The amount of ink remaining in the rotary screen can be stabilized, and the amount of ink supplied from the screen plate is almost the same, so even when long-term continuous printing is performed, it is possible to produce high-quality and stable print products. It was.

In addition, since the adjustment of the squeegee pressing and the adjustment of the ink supply amount are automatic, the work load can be greatly reduced. Further, since the detection means and the like are installed outside the rotary screen printing machine, the malfunction and failure of the detection means due to ink stains are eliminated, and the work load required for cleaning the detection means can be reduced.

In addition, since the amount of ink in the rotary screen can now be controlled reliably, for example, even when ink sensitive to temperature dependence is used, drying of the ink in the rotary screen, which was previously a concern, is suppressed. And continuous printing can be performed without changing its characteristics. In addition, downtime such as machine adjustment due to ink failure can be reduced, and productivity is remarkably improved.

A sectional view of a rotary screen printer in the present invention is shown. The top view of the rotary screen printer in this invention is shown. The hardware block diagram of the automatic control using the rotary screen drive motor electric current in this invention is shown. The image figure of the automatic control using the rotary screen drive motor electric current in this invention is shown. The flowchart of the automatic control using the rotary screen drive motor electric current in this invention is shown. The operation example of the automatic control using the rotary screen drive motor current in this invention is shown. The operation example of another form of the automatic control using the rotary screen drive motor current in the present invention is shown.

Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments within the scope of the technical idea described in the claims.

First, the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a rotary screen printing machine according to the present invention. FIG. 2 is a plan view of the rotary screen printing machine according to the present invention.

FIG. 1 is a cross-sectional view showing a printing unit (1) in a rotary screen printing machine (S). The rotary screen printing machine (S) includes a printing unit (1), a paper feeding unit and a paper discharge unit (not shown), and the like. The paper feed unit includes a paper feed unit and a stacking unit. The paper feeding means is means for supplying the printing material (P) from the stacking means to the printing unit (1). The stacking unit is a unit that stacks the sheet-like printed material (P). The printed materials (P) placed on the stacking means are fed one by one by the supply means. The fed substrate (P) is then conveyed to the printing unit (1).

The printing unit (1) has an impression cylinder (2), a rotary screen (3), an ink supply means (4), a squeegee (5), and a support (6). The impression cylinder (2) is means for applying pressure to the printing material (P) in order to transfer ink onto the printing material (P). The impression cylinder (2) has a cylindrical shape and is supported by a rotatable shaft core at the center. The rotary screen (3) is a means for giving an image line portion (e) to the substrate (P). The rotary screen (3) has a hollow cylindrical shape and is provided with a through-hole through which ink passes in order to form an image line portion (e) such as a pattern. The ink supply means (4) is a means for supplying ink (E) into the rotary screen (3). The ink supply means (4) is connected to an ink tank (not shown), sucks up ink (E) from the ink tank by a pump or the like, and discharges the ink (E) from the ink supply means (4) into the rotary screen (3).

In the printing unit (1), the impression cylinder (2) and the rotary screen (3) are arranged to face each other in the main body cover. Further, at least one ink supply means (4) is installed in the rotary screen (3), and preferably a plurality of ink supply means (4) are arranged in a direction parallel to the axial direction of the rotary screen (3). The rotary screen (3) is rotatably supported by connecting the end of the cylinder to a rotating body (not shown) in this figure. During printing, the impression cylinder (2) and the rotary screen (3) are driven to rotate.

FIG. 2 is a plan view showing the printing unit (1) in the rotary screen printing machine (S). In addition to the printing unit (1) shown in FIG. 1, the printing unit (1) has a squeegee pressing adjustment motor (7), a rotary screen drive motor (8), a speed reducer (9), and a rotary screen drive current detector (10). is doing.

The squeegee pressing adjustment motor (7) is attached to both ends of the support (6) that supports the squeegee (5), and the squeegee (5) disposed in the rotary screen (3) is attached to the rotary screen (3). ) To adjust the contact pressure between the squeegee (5) and the rotary screen (3). The contact pressure between the squeegee (5) and the rotary screen (3) is adjusted by the amount by which the squeegee (5) is pushed into the rotary screen (3).

The rotary screen drive motor (8) is disposed outside the main body cover, and the rotary screen (3) rotates by driving the rotary screen drive motor (8).

The speed reducer (9) is disposed between the rotary screen (3) and the rotary screen drive motor (8), and the rotary screen drive motor (8) is connected to the rotary screen (via the speed reducer (9)). It is connected to the end of 3) by a gear. The speed reducer (9) reduces the rotational speed of the rotary screen drive motor (8) that rotates at a high speed to the rotational speed of the rotary screen printing machine (S) and rotates the rotary screen printing machine (S). There is a role to increase the driving torque of.

The rotary screen drive current detector (10) is attached to the rotary screen drive motor (8) and detects a current value generated when the rotary screen (3) is driven.

The rotary screen drive current detector (10) measures the current value of the rotary screen drive motor (8), and compares the measured current value with a preset reference current value. This mechanism automatically adjusts the ink supply and the squeegee press when it deviates. Next, an apparatus for automatically controlling the ink supply amount and automatically controlling the squeegee press will be described.

FIG. 3 is a configuration diagram of an automatic control device using a current value in the rotary screen drive motor (8). The automatic control device includes a management unit (11), a control unit (12), and an operation unit (13). The control unit (12) further includes a data setting unit (14), an electronic timing unit (15), It has a detection means (16), a comparison means (17), and a transmission means (18).

The management unit (11) is a part that accumulates data necessary for automatic control in advance. The data required for automatic control is the basic current value, setting unit time, ink weight adjustment amount and squeegee push-in adjustment amount, which will be described later, and the basic current value, set unit time, ink weight adjustment amount and squeegee push-in adjustment amount. Varies depending on the ink characteristics of the ink used, the plate configuration of the printing plate used, the printing conditions for printing, and the like. Therefore, several types of data are collected for determining the ink characteristics of the ink to be used, the plate surface configuration and the printing conditions, the set unit time, the ink weight adjustment amount and the squeegee push-in adjustment amount, and the management unit (11) Are stored in association with each other. Data for determining the ink characteristics of the ink to be used, the plate surface configuration and the printing current, the setting unit time, the ink weight adjustment amount, and the squeegee push-in adjustment amount will be described later.

The data setting means (14) in the control unit (12) stores in advance in the management unit (11) data suitable for the ink characteristics, plate surface configuration and printing conditions of the ink to be used before operating the rotary screen printing machine. It is a means for selecting and setting from the data. The data corresponding to the ink characteristics of the ink to be used, the plate surface configuration, and the printing conditions are the basic current value, the set unit time, the ink weight adjustment amount, and the squeegee push-in adjustment amount.

The electronic timing means (15) in the controller (12) is a means for setting at which timing the current value is detected in one rotation (360 degrees) of the rotary screen (3). Examples of the timing to be set include an image line portion, a non-image line portion of the printing plate, and a gap portion (notch portion) of the opposing impression cylinder (2).

The detection means (16) in the control unit (12) is a means for detecting a current value generated by driving the rotary screen (3) every time the set unit time set by the data setting means (14) elapses. . The timing for detecting the current value when the set unit time has elapsed is the timing set in the electronic timing means (15).

The comparison means (17) in the control section (12) is a means for comparing the current value obtained by the detection means (16) with the basic current value stored in advance in the management section (11).

The transmission means (18) in the control section (12) is an operation section described later according to the ink weight adjustment amount set by the data setting means (14) every time the set unit time set by the data setting means (14) elapses. This is means for propagating a command for supplying ink to (13). Further, as a result of comparison by the comparison means (17), when the basic current value and the detected current value are different from each other, a command for propagating the squeegee push-in amount is transmitted to the operation section (13).

The operation part (13) is a part that supplies ink according to the ink weight adjustment amount after receiving an instruction regarding ink supply from the transmission means (18) in the control part (12). Further, after receiving a command for pushing the squeegee from the transmission means (18) in the control unit (12), the squeegee (5) is moved forward or backward with respect to the axial direction of the rotary screen (3) according to the squeegee pushing adjustment amount. It is a place.

Furthermore, the automatic control apparatus may have a display unit (19), and the display unit (19) displays data of the control unit (12) and the management unit (11).

The basic current value, current current value, upper / lower limit current value, set unit time, detection timing frequency, squeegee push-in adjustment amount, and the like are displayed on the display unit so that the operator can visually confirm them.

FIG. 4 is a graph showing an example of data for determining the ink characteristics of the ink to be used, the plate surface configuration and the printing conditions, the basic current value, the set unit time, the ink weight adjustment amount, and the squeegee push-in adjustment amount.

The X axis in the graph in FIG. 4 indicates time (number of printed sheets), and the Y axis indicates a current value. In the X axis, the time elapsed from “X0” to “X1” is set as the set unit time, and “Y0” in the Y axis is the basic current value.

The set unit time is a timing for detecting a current value generated when the rotary screen (3) is driven. Every time the set unit time elapses, the set unit time elapses in the detection means (16) described later. A signal is sent to inform you that

In addition, “A” in the graph is a current change value per set unit time, “B” in the graph is a current change value accompanying a change in ink weight per set unit time, and “C” in the graph is a set unit time. The current change value accompanying the squeegee pressing change is shown. The current value (A) in the rotary screen drive motor (8) is indicated by the sum of the current change value (B) accompanying the ink weight change and the current change value (C) accompanying the squeegee pressing change.

The current change value (bb ′) accompanying the ink weight change per set unit time is “Y1” to “Y2”, and the current change value (cc ′) accompanying the squeegee pressing change per set unit time is “Y3” to “Y4”. Further, the sum (a−a ′) of the current change values accompanying the ink weight change and the squeegee press change is “Y0” to “Y2”.

From this, when the set unit time has elapsed from “X0” to “X1”, the current value changes from “Y0” to “Y2”. Therefore, it is necessary to return the current value changed to “Y2” to the basic current value “Y0”. The amount of current adjustment required for this is the required amount of adjustment indicated by the solid arrow in the graph.

The necessary adjustment amount of the current value is performed by adjusting the ink supply amount and the squeegee push-in amount. The amount of ink to be added is the ink weight adjustment amount indicated by the dotted arrow in the graph, and the amount to adjust the squeegee push is the squeegee push adjustment amount indicated by the double line arrow in the graph.

FIG. 4 shows examples of ink characteristics of the ink to be used in advance, the basic current value, setting unit time, ink weight adjustment amount and squeegee push-in adjustment amount with respect to the printing plate configuration and printing conditions. A plurality of types of data corresponding to the configuration and printing conditions are stored in the management unit (11).

FIG. 5 is a flowchart of automatic control using a current value by a rotary screen drive motor. The method for controlling the current value by the rotary screen drive motor in the present invention will be described with reference to the flowchart.

First, before operating the rotary screen printing machine, data corresponding to the ink characteristics of the ink to be used, the plate surface composition, and the printing conditions were selected from the data stored in the management unit (11) in advance and selected. Data is set in the setting means (18) in the control unit (12) (STEP 1).

It is determined whether or not the set unit time has elapsed after the rotary screen printer has been operated (STEP 2). If it is determined that the set unit time has not elapsed, the operation of the rotary screen printer is continued as it is until the set unit time has elapsed. When it is determined that the set unit time has elapsed, ink is supplied according to the ink weight adjustment amount stored in advance in the management unit (11) (STEP 3).

Next, it is determined whether or not the basic current value has been reached (STEP 4). If it is determined that the current value has returned to the basic current value, the adjustment by pressing the squeegee is not performed, and then the process returns to STEP 2 again, and the operation of the rotary screen printer is continued as it is until the set unit time has elapsed. If it is determined that the current value has not returned to the basic current value, adjustment by pushing the squeegee is performed according to the squeegee push-in adjustment amount stored in advance in the management unit (11) (STEP 5).

Although the ink supply operation is performed first after the set unit time has elapsed, the squeegee adjustment operation may be performed first depending on the situation.

The first embodiment of the present invention will be described with reference to the flowchart of FIG. 5 and the operation example of FIG. Data suitable for the ink characteristics, plate configuration, and printing conditions of the ink used this time is selected from the data stored in advance in the management unit (11), and automatic control is started.

In Example 1, as shown in FIG. 6A, the index of the basic current value is “100”, and “20 Kg” of ink is consumed in “1 hour”, and the index change value of the current value at that time Is stored as “20”. In the present invention, it is assumed that the ink consumption and the current change value are in a proportional relationship.

If the basic current value index does not reach “100” after supplying “20 Kg” of ink, the squeegee is worn and worn. The index of the basic current value is returned to “100” by increasing “1”. Here, it is assumed that the squeegee push-in amount and the current change value have a proportional relationship.

As shown in FIG. 6B, automatic control starts simultaneously with the operation of the rotary screen printer (STEP 1). Thereafter, it is determined whether or not “1 hour” as the set unit time has elapsed (STEP 2). If it is determined that “1 hour” has not elapsed, the operation of the rotary screen printing machine is continued as it is until “1 hour” has elapsed.

Thereafter, when it was determined that “1 hour” had elapsed, the result of measuring the current value index at that time was “78”. At the same time, ink is supplied in accordance with the ink weight adjustment amount stored in advance in the management section (11) (STEP 3). In this embodiment, it is learned from the stored data that 20 kg of ink is consumed in one hour, so 20 kg of ink is supplied. Since the increase in the index of the current value accompanying the ink supply is “20”, the index of the current value after the ink supply is “98+” at “78 + 20”.

After the ink supply is completed, it is determined whether or not the index of the basic current value is “100” (STEP 4). When it is determined that the index of the basic current value has returned to “100”, the adjustment by pushing the squeegee is not performed, and then the operation returns to (STEP 2) again, and “1 hour” as the set unit time has elapsed again. Continue to operate the rotary screen printer until

However, in this embodiment, the index of the current value after ink supply is “98”, and does not return to “100” which is the index of the basic current value. Here, the difference between the index of the current value from the index “100” of the basic current value and the index “98” of the current value after ink supply to “100-98” becomes “2”, and this difference is managed by the management unit (11). Is adjusted according to the squeegee push-in amount stored in advance (STEP 4).

Specifically, based on the squeegee push-in amount “0.1 mm” stored in advance, the squeegee is pushed “0.1 mm”, and then it is determined again whether the index of the basic current value has become “100”. (STEP4). By pushing the squeegee “0.1 mm”, the current value index increases by “1”, so that the current value index becomes “99” at “98 + 1”, but the basic current value index “100”. Therefore, push the squeegee “0.1 mm” further. As a result, since the current value index further increases by “1”, the basic current value index becomes “100” at “99 + 1”. Thereafter, the process returns to STEP 2 again, and the operation of the rotary screen printer is continued until the set unit time “1 hour” elapses.

The operation example shown in FIG. 6B shows the actual value of the current value when the set unit time has passed 1 hour after operating the rotary screen printing machine, and then the set unit time. It goes without saying that the actual value of the current value when 1 hour elapses may be different from that shown in FIG. For example, when the third set unit time has elapsed since the rotary screen printer was operated, in other words, when 3 hours have elapsed since the rotary screen printer was operated, the current value after supplying 20 kg of ink. May be “77”. In that case, the index of the basic current value returns to “100” by adjusting the squeegee push-in amount in units of “0.1 mm” and pushing the squeegee three times.

Further, as a method of adjusting the push amount of the squeegee, as shown in FIG. 7A, it is known in advance that the current value index decreases by “2” in “1 hour” due to wear of the squeegee. Is stored in the management unit (11), the squeegee is not pushed in units of “0.1 mm” as described above with reference to FIG. 6B, but at a time as shown in FIG. 7B. There is a case where “0.2 mm” is pushed in and the index of the basic current value is returned to “100” at a time.

However, in the case of this method, a problem occurs when the actual squeegee wear amount is smaller than the squeegee wear amount for the preset unit time stored in advance, or vice versa.

For example, since the squeegee wears “0.2 mm” after the set unit time “1 hour” has elapsed, it was remembered that the squeegee was pushed “0.2 mm” after the lapse of “1 hour”. If the squeegee is worn only by “0.1 mm” during screen operation, the basic current value will be exceeded if the squeegee is pushed in based on the pre-stored squeegee push-in adjustment amount “0.2 mm”. there is a possibility.

On the contrary, since the squeegee wears “0.2 mm” after the set unit time “1 hour” has elapsed, it was remembered that the squeegee was pushed “0.2 mm” after the lapse of “1 hour”. If the squeegee is worn by “0.3 mm” during actual rotary screen operation, the basic current value index will be maintained even if the squeegee is pushed in based on the squeegee push-in adjustment amount “0.2 mm” stored in advance. There is a possibility that the operation of the rotary screen is continued in a state where the value does not reach “100”. If this state is added many times, the squeegee press will not be constant, and the print quality may be adversely affected.

Therefore, with regard to the adjustment of the squeegee push-in amount, the method of pushing in the unit of “0.1 mm” as described with reference to FIG. 6 and repeatedly pushing the squeegee several times until returning to the basic current value is recommended. .

Although several examples of implementation have been described so far, as a matter of course, when various detectors fail, a safety measure function such as stopping various operations in the rotary screen printer may be attached.

DESCRIPTION OF SYMBOLS 1 Printing part 2 Pressure drum 3 Rotary screen 4 Ink supply means 5 Squeegee 6 Squeegee holder (support)
7 Squeegee Press Adjustment Motor 8 Rotary Screen Drive Motor 9 Reducer 10 Rotary Screen Drive Current Detector 11 Management Unit 12 Control Unit 13 Operation Unit 14 Data Setting Unit 15 Electronic Timing Unit 16 Detection Unit 17 Comparison Unit 18 Transmission Unit 19 Display Part S Rotary screen printer P Substrate (paper)
E Ink in the rotary screen e Ink (image area)

Claims (5)

In an automatic control device that automatically controls ink supply and squeegee pressing according to the current value of a rotary screen drive motor in a rotary screen printing machine, the automatic control device has a basic current corresponding to the ink according to the characteristics of the ink used. Value, set unit time, ink weight adjustment amount and squeegee push-in adjustment amount stored in advance, and ink supply amount based on the ink weight adjustment amount for the set unit time stored in the management unit The squeegee push-in adjustment for controlling the squeegee press based on the comparison result, comparing the current value of the rotary screen drive motor with the basic current value when the set unit time has elapsed The controller determines the amount, and supplies the ink based on the determination by the controller. Automatic control system for the ink supply and the squeegee pressing the rotary screen printing, characterized in that it comprises an operation unit for performing indentation of the squeegee. The control unit is configured to store the basic current value, the set unit time, the ink weight adjustment amount, and the squeegee push-in adjustment amount stored in advance in the management unit before the rotary screen printing machine is operated. Data setting means for setting the corresponding basic current value, the set unit time, the ink weight adjustment amount, and the squeegee push-in adjustment amount, and the timing setting for detecting the current value during one rotation of the rotary screen. Obtained by the electronic timing means, a detection means for detecting a current value generated in the drive motor of the rotary screen at the timing set in the electronic timing means every time the set unit time elapses, and the detection means Comparing means for comparing the current value and the basic current value, and the set unit time Each time it passes, a command for adjusting the supply of the ink to the operating unit based on the ink weight adjustment amount is propagated, and as a result of comparison by the comparison means, the basic current value and the detected current value are 2. The ink supply and the squeegee pressing in rotary screen printing according to claim 1, further comprising a transmitting means for propagating a command for adjusting the pressing amount of the squeegee to the operating portion when they are different. Automatic control device. 3. The automatic control device further includes a display unit for displaying a set value in the data setting unit, a detection value in the detection unit, and a comparison result in the comparison unit, respectively. Automatic control device for ink supply and squeegee pressing in rotary screen printing. In an automatic control method for automatically controlling ink supply and squeegee pressing according to a current value of a rotary screen drive motor in a rotary screen printing machine, the automatic control method has characteristics of ink used before the operation of the rotary screen printing machine. Set the basic current value, setting unit time, ink weight adjustment amount and squeegee push-in adjustment amount corresponding to the ink accordingly, and determine whether the set unit time has always passed after the rotary screen printing machine is operated. When it is determined that the set unit time has not elapsed, the operation of the rotary screen printing machine is continued, and when it is determined that the set unit time has elapsed, according to the ink weight adjustment amount. After supplying the ink and finishing the ink supply, the rotary The current value generated in the drive motor of the lean is compared with the basic current value, and if the current value and the basic current value are different, adjustment is performed by pushing the squeegee in accordance with the squeegee pushing adjustment amount, and the current value and An automatic control method for ink supply and squeegee pressing in rotary screen printing, wherein when the basic current values are the same, it is determined again whether the set unit time has elapsed. After pushing the squeegee according to the squeegee push-in adjustment amount, the current value generated in the drive motor of the rotary screen is compared with the basic current value again, and the current value and the basic current value are the same value. 5. The method for automatically controlling ink supply and squeegee press in rotary screen printing according to claim 4, wherein the squeegee is pushed in accordance with the squeegee push-in adjustment amount.

Images