JP2013091247A - Ink supply apparatus of intaglio printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink supply for an intaglio printing press capable of realizing a stable ink supply and reducing the burden on an operator.
In an ink supply device of an intaglio printing press, an ink film thickness measuring device that is disposed in the vicinity of an ink discharging roller and that measures the ink film thickness on the ink discharging roller, and is connected to the ink film thickness measuring device. The measurement value storage device that stores the measurement value measured by the thickness measurement device, the reference value storage device that presets and stores the reference value, and the measurement value of the measurement value storage device and the reference value of the reference value storage device are compared. An analysis device including a comparison device and at least a control device that controls the forward / backward movement of the ink fountain key based on the analysis result of the analysis device are provided.
[Selection] Figure 1

Description

  In the intaglio printing press, the present invention measures the ink film thickness on the surface of the ink discharge roller and controls the ink fountain key back and forth with respect to the ink discharge roller in accordance with the measurement data, thereby realizing optimal ink supply. The present invention relates to an ink supply device for an intaglio printing press.

  In general, an ink supply device in an intaglio printing machine is provided in the vicinity of an ink discharge roller (also referred to as a duct roller) (2) for transferring ink and an ink discharge roller (2) as shown in FIG. (2) between the ink placement plate (5) for forming the ink fountain (4) for retaining the ink (3), on both sides of the ink discharge roller (2) and the ink placement plate (5) And a side plate that regulates leakage of the ink (3) present in the ink fountain (4) and is disposed opposite to the ink discharge roller (2), for example, a calling roller, a kneading roller, a swinging roller, and a landing roller The ink (3) is transferred in order to the roller (6) (the calling roller, the kneading roller and the swinging roller may not be provided), and the intaglio is finally mounted on the surface of the plate cylinder (9). The ink (3) is supplied to the surface (7), and then the excess ink existing on the intaglio plate surface (7) is wiped off by a wiping roller (11) disposed at a position facing the intaglio plate surface (7). Printing is performed by interposing a sheet on the contact surface with 10).

  An ink supply device of a general intaglio printing press is arranged below the ink placement plate (5) and divided into a plurality of ink fountain keys (8) directed to the ink discharge roller (2). The ink supply amount is adjusted by controlling the ink film thickness on the ink discharge roller (2) by moving the front and rear, moving the distance between the tip of the ink fountain key (8) and the ink discharge roller (2). It is a mechanism to do.

  Above all, as a device for controlling the ink supply amount in a general printing machine, for example, an array type photoelectric element that shines light on the surface of the printed paper is used to generate a reference pulse according to the rotational speed of the plate cylinder. When the reflectance of each color ink printed on the surface of the printing paper is measured for each block of blocks based on the signal from the pulse generator, and the operator judges that the color of the printed material matches the color of the sample A reference signal that is a reflectance signal for each block unit of each color measured for each color, and a current signal that is a reflectance signal that is obtained by measuring the color of the printed material measured every certain number of blocks in units of a block unit A color tone adjustment method in an offset printing press that controls the ink supply amount by adjusting the ink key of the printing press based on the difference between the reference signal and the constant signal from the current signal. Only a signal having a low reflectance that is equal to or greater than the value is selected, and the selection result is integrated for each color for each control unit corresponding to the width of the ink key for each of the current signal and the reference signal, and then compared, and each color of the comparison result is compared. When the difference signal for each color exceeds a certain amount, the difference signal is calculated with a coefficient corresponding to the ink supply amount of each color that is initially set in the printing press to calculate the ink supply amount of each color ink key, thereby controlling the color tone There has been proposed a color tone adjustment method in a printing press characterized by doing so (see, for example, Patent Document 1).

  In addition, as an apparatus for stabilizing the ink supply amount in an intaglio printing machine, for example, an ink placing plate disposed obliquely between frames disposed on both sides of the printing width and disposed on both sides in the width direction. The ink fountain for storing the ink formed by the side plates and the bearings provided on the left and right frames are rotatably supported, and the ink fountain is disposed at a position close to the end of the ink placing plate. A duct roller for feeding out, a basin mounted on both left and right frames and disposed below the ink placement plate, an ink fountain key finely divided into a plurality along the duct roller, and ink An ink supply device for an intaglio printing press having a drive unit for moving the key forward and backward with respect to the duct roller. Applicants' of the ink supply device of an intaglio printing machine using an ink fountain key as the rectangular sectional shape of the ridge has been proposed (e.g., see Patent Document 2).

Japanese Patent No. 3764646 JP 2010-83052 A

  When the technique of Patent Document 1 as the prior art described above is used, the printed matter and the printed matter for each fixed number of sheets when the operator determines that the colors of the printed matter and the sample match each other are divided into blocks. By collecting and integrating only those whose reflection intensity exceeds a certain threshold, it is possible to perform color tone control such as ink key opening only with information obtained from the pattern part of the printed matter being printed Become. Therefore, unlike the conventional apparatus, there is no need for separate information for determining the solid portion and the blank paper portion, and an accurate value with abundant information can be obtained by using a portion having a high ink density. In addition, since the reference value of reflectivity is not calculated, stable response is possible even if various characteristics of the printing machine change, and a rotary press for newspapers, etc., where the image rate information cannot be obtained from upstream In this case, accurate color tone control can be performed. Therefore, it is possible to provide a color tone adjustment method and apparatus in a high-speed and stable printing machine without requiring anything other than actual printed matter.

  However, based on the reflectance of each color of the pattern portion in the printed matter as described above, the difference between the reference reflectance and the reflectance of the printed matter that is actually printed is calculated, and the ink fountain key opening is calculated based on the difference. In an ink supply device in a conventional printing press that controls the color tone by adjusting the degree, it is effective in offset printing in which the amount of ink transferred to the ink discharge roller is small (for example, about 5 μm in ink film thickness). Although it is possible to adjust the ink supply, intaglio printing has a larger ink film thickness to the ink discharge roller than offset printing (for example, ink film thickness of about 50 μm) and the viscosity of the ink used is high. It is difficult to detect a significant difference in reflectivity, and the ink supply key is operated based on the reflectivity of each color to control the ink supply amount. It is difficult to do. For this reason, the prior art is not used for intaglio printing and is not widely used.

  In addition, when the technique of Patent Document 2 which is the prior art described above is used, since the tip of the ink fountain key that directly affects ink supply is not a line contact but a surface contact, the applied heat quantity (thermal stress) is dispersed. It is possible to suppress wear and tear of the ink fountain key tip. In addition, by suppressing the heat storage in some parts of the ink fountain key, excessive evaporation of the solvent components in the ink can be eliminated, preventing unnecessary ink hatching and allowing the tip of the ink fountain key to be used. Since it is coated with a fiber reinforced metal that is excellent in flexibility and toughness, wear and wear can be suppressed, and fulfilling quality maintenance can be realized in that a high-quality printed product can be obtained continuously.

  However, in the ink supply device of the conventional intaglio printing press as described above, it is possible to suppress the abrasion loss of the ink fountain key, and it is possible to stabilize the ink film thickness on the ink discharge roller to some extent. However, it is difficult to make the ink film thickness of the ink discharge roller that changes from time to time due to thermal expansion of the wiping roller constant, and as a result, adjustment of the ink discharge amount from the ink discharge roller is accurate. Therefore, it has been difficult to obtain uniform and highly accurate printed matter continuously. As a countermeasure, the operator has to frequently measure the ink film thickness on the ink discharge roller, and it is necessary to adjust the ink film thickness by operating the ink fountain key each time. Is annoying. Until now, no countermeasures have been taken against various problems, and there has been a lot of room for development in an ink supply device especially for intaglio printing.

  In order to solve the problems as described above, the ink supply device of the intaglio printing press according to the present invention is disposed in the vicinity of the ink discharge roller for feeding ink from the ink fountain, and measures the ink film thickness on the ink discharge roller. An ink film thickness measuring device, a measurement value storage device that is connected to the ink film thickness measuring device and stores measurement values measured by the ink film thickness measuring device, a reference value storage device that presets and stores reference values, and a measurement An analysis device including a comparison device that compares a measurement value of the value storage device with a reference value of the reference value storage device, and a control device that controls the forward / backward movement of the ink fountain key based on the analysis result of the analysis device This is an ink supply device for an intaglio printing press.

  The ink film thickness measuring device in the ink supply device of the intaglio printing press according to the present invention is an ink supply device of an intaglio printing press disposed downstream of the ink fountain key in the rotation direction of the ink discharge roller.

  Moreover, the ink film thickness measuring apparatus in the ink supply apparatus of the intaglio printing press according to the present invention is an ink supply apparatus for an intaglio printing press equipped with a magnetic quantity detector for detecting the magnetic quantity in the ink.

  Furthermore, the ink film thickness measuring device in the ink supply device of the intaglio printing press of the present invention is an ink supply device of an intaglio printing press equipped with an absorbance detector for detecting the absorbance in the ink.

  The ink supply device of the intaglio printing press according to the present invention is different from the ink supply device in which the gap between the ink discharge roller and the ink fountain key is adjusted by the operator each time as in the prior art. Alternatively, the magnetic quantity or absorbance within the ink film thickness is measured together, and the ink fountain key directed to the ink discharge roller is moved forward and backward according to the measured value, and the gap between the ink discharge roller and the ink fountain key is adjusted and controlled. As a result, the amount of ink supplied becomes appropriate, and as a result, it is possible to obtain a uniform intaglio printing product continuously and stably over a long period of time, and it is possible to maintain a satisfactory product quality. .

  In addition, since the ink supply device of the intaglio printing press according to the present invention can realize stable ink supply, it is possible to greatly suppress the occurrence of damaged paper due to ink shading. In addition, since the proper supply of ink to be used can be realized, the use of excess ink is suppressed, the load on the wiping roller that wipes off excess ink can be reduced, and the life of the wiping roller can be extended. Compared with this, it is possible to realize a significant cost reduction.

  Furthermore, by using the ink supply device of the intaglio printing press according to the present invention, all the problems in this problem can be solved and stable supply of ink becomes possible. Is not necessary, and it is possible to shorten the time until stabilization of printing at the start of printing. In addition, the cleaning work accompanied by machine stoppage due to a problem called “misting” that has been caused by excessive variation in the amount of ink supply has been greatly suppressed, and various other operations frequently performed by operators. The adjustment work can be reduced and the workability can be greatly improved and the downtime of the printing machine can be reduced.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view of an ink supply device in an intaglio printing press according to the present invention as seen from the side. FIG. 2 is an enlarged schematic view of a part of the ink film thickness measuring device arranged in the vicinity of the ink discharge roller, which is one of the features of the present invention. FIG. 3 is a schematic view of the ink supply device in the intaglio printing press as viewed from above. FIG. 4 is a schematic view of an ink supply device in another form of intaglio printing press as seen from the side. FIG. 5 is a schematic view seen from the side for explaining an ink film thickness measuring apparatus attached with a magnetic quantity detector for detecting the magnetic component of the ink existing on the ink discharge roller and an absorbance detector for detecting the absorbance of the ink. Further, FIG. 6 is a schematic view of an ink supply device of a general intaglio printing press as viewed from the side.

  First, an ink supply device for a general intaglio printing press will be described in detail. As shown in FIG. 6, the ink supply device of a general intaglio printing press is provided in the vicinity of an ink discharge roller (2) for transferring ink and an ink discharge roller (2). An ink fountain plate (5) for forming an ink fountain (4) for retaining the ink (3) between the ink fountain roller (2) and the ink fountain plate (5). It is an aspect comprised from the side plate (20) which controls the leakage of the ink (3) which exists in (4). Then, the ink (3) existing in the ink fountain (4) is transferred from the ink discharge roller (2) to the form roller (6) disposed opposite to the ink discharge roller (2), and finally the intaglio plate surface The ink (3) is supplied up to (7), and then printing on the sheet is performed in the printing section. As for the ink supply mechanism, depending on the type of ink (3) to be used, a calling roller, a kneading roller, a swinging roller, and the like may be arranged between the ink discharge roller (2) and the form roller (6).

  Ink supply in a general ink supply apparatus is made by forming a groove by an ink placing plate (5) disposed opposite to an ink discharge roller (2), and an appropriate amount of ink (3) is put therein and ink is supplied. By moving a plurality of ink fountain keys (8) arranged at the bottom of the mounting plate (5) back and forth, the gap with the ink discharge roller (2) is adjusted independently, and the ink discharge roller ( By rotating 2), it is a mechanism for controlling the ink discharge amount and transferring the ink (3).

  On the other hand, as shown in FIGS. 1 to 3, the ink supply device of the intaglio printing press according to the present invention is an ink film thickness measuring device (in the vicinity of the surface of the ink discharge roller (2) (about 10 mm from the roller surface)). 1). And the film thickness of the ink (3) transferred to the surface of the ink discharge roller (2) was measured in the ink film thickness measuring device (1), and the measured value was connected to the ink film thickness measuring device (1). It is transmitted to the analysis device (13). 1 and 2, the ink film thickness measuring device (1) is arranged perpendicular to the axis of the ink discharge roller (2), but is directed to the axis of the ink discharge roller (2). As long as it is downstream of the ink fountain key (8), it may be arranged at any angle.

  The analysis device (13) includes a measurement value storage device (16) for recording measurement values measured by the ink film thickness measurement device (1), a reference value storage device (17) for presetting and storing reference values, and It comprises a comparison device (18) that compares the measurement value of the measurement value storage device (16) with the reference value of the reference value storage device (17). It is connected to a control device (14) having a control function that can be instructed.

  Based on the analysis result of the analysis device (13), the control content is organized by the connected control device (14), the content is propagated, and the drive unit (15) in the ink fountain key (8) is operated. I will let you. Specifically, a deviation between the measured value of the ink film thickness measured by the ink film thickness measuring device (1) and the reference value input to the reference value storage device (17) is appropriately calculated by the analyzing device (13). , A signal with a deviation of 0 is output to the control device (14). A command for adjusting the forward / backward movement of the ink fountain key (8) is transmitted from the control device (14), and the ink fountain key (8) is driven back and forth by operating the drive unit (15). By changing the gap between the take-out roller (2) and the ink placement plate (5), the supply amount of the ink (3) existing on the ink placement plate (5) in the relevant part is adjusted. When the ink film thickness becomes extremely low, the control device (14) can send an alarm to the operator or send a stop signal for the printing machine.

  Further, a plurality of ink film thickness measuring devices (1) may be arranged as shown in FIG. Unless specifically limited, the same number of ink fountain keys (8) are arranged. In addition, when the ink film thickness measuring device (1) is designed to be small, the ink film thickness measuring device (1) is transferred to the measuring device mounting shaft (24) and arbitrarily moved so as to The ink film thickness can be measured even at the position.

  In addition, the measurement of the ink film thickness in the ink film thickness measuring device (1) is not particularly limited, and a method using a non-contact displacement meter may be used, or a contact film thickness gauge may be used. It is good also as a method of reading a measured value with an optical camera, and it can be set as arbitrary structures as long as the ink film thickness on the surface of the ink discharge roller (2) can be detected. Since the configuration of the other ink supply apparatus is the same as that of a general intaglio printing machine, its detailed description is omitted.

  Further, as shown in FIG. 4, the ink supply device of the present invention may cause the sliding roller (12) for the purpose of leveling the ink to rotate and contact the ink discharge roller (2). In that case, the ink film thickness measuring device (1) is disposed downstream of the sliding roller (12) in the rotation direction of the ink discharge roller (2).

  Furthermore, the ink supply device of the present invention is provided with a magnetic sensor (26) and a magnetic material (25) for the purpose of detecting a magnetic component present in the ink in the ink film thickness measuring device (1) as shown in FIG. For example, an imaging device (27) that captures an infrared component for the purpose of detecting the ink absorbance in the ink film thickness measuring device (1), in the case where the magnetic quantity detector (22) is attached. ), An absorbance detector (23) including an infrared light receiving element (28) and an infrared lamp (29) for input to the imaging device (27) may be provided. The magnetic quantity detector (22) and the absorbance detector (23) attached to the ink film thickness measuring device (1) may be used in combination, or only one of them may be used. Good.

In the embodiment of the present invention, the printing speed is set to 9,000 sheets / hour using an ink supply device of an intaglio printing machine as shown in FIGS. 300,000 sheets) were printed. As the ink film thickness measuring device (1), a two-dimensional laser displacement sensor (LJ-G030; manufactured by Keyence Co., Ltd.), which is a non-contact type measuring device, is used, and the height is about 10 mm from the surface of the ink discharge roller (2). It was installed and measured. In addition, the ink film thickness measuring device (1) is installed at four locations on the measuring device mounting shaft (24), and the position corresponding to the ink fountain key (8) is arbitrarily moved by the control device (14). It was decided to detect the ink film thickness at that location. Further, as the printing ink, an intaglio ink having a viscosity of 5,000 cp (centipoise) and a yield value of 10,000 dynes / cm ² was used. Then, as a reference value to the reference value storage device (17), the set film thickness “42 μm” was input and printing was performed.

  When the ink supply device in the printing machine is operated, the two-dimensional laser displacement sensor, which is the ink film thickness measuring device (1), starts measuring the ink film thickness on the ink discharge roller (2), and reaches the set film thickness of 42 μm. The drive part (15) existing in the ink fountain key (8) was operated, the ink fountain key (8) was moved backward, and the opening degree adjustment was started. Then, it was confirmed that the ink (3) in the ink fountain (4) was gradually supplied to the ink discharge roller (2) by adjusting the opening degree of the ink fountain key (8).

  As an evaluation of the ink supply state, the ink film thickness on the surface of the ink discharge roller (2) was separately measured with a film thickness gauge (234R type, manufactured by Sanko Electronics Co., Ltd.) at an interval of about 41 μm. It was stable in the range of ˜43 μm, and the displacement of the ink film thickness state was substantially uniform and confirmed to be stable. Further, even when the printed product was observed in time series until the total number of printed sheets of the sheet was 300,000, the quality state was not significantly changed and was excellent.

  On the other hand, it implemented also about the aspect which newly arrange | positioned the sliding roller (12) which knead | mixes the ink on an inking roller (2) as shown in FIG. 4, and confirmed the result. Also in this example, the ink film thickness on the ink discharge roller (2) was stable in the range of about 41 μm to 42 μm. In addition, when the printed product in the meantime was observed suitably, it confirmed that it was a good quality printed product.

  In addition, it can be imagined that dry ink adheres to the surface of the ink discharge roller (2) with the progress of printing, and adversely affects the detection of the ink film thickness. In order to separate and extract the ink component adhering to the surface of the take-out roller (2) and the ink component that has not been transferred from the ink fountain, a magnetic quantity detector (22) is used in the ink film thickness measuring device (1) as shown in FIG. ) And an absorbance detector (23) were also carried out, and the results were confirmed. Here, as the magnetic quantity detector (22), a detector comprising a magnetic sensor (26) (HP-10; manufactured by Makome Laboratories) and a magnetic body (25) is used, and absorbance detection is performed. As an instrument (23), an infrared lamp (29) is used as a light source to irradiate the roller surface, and an electromagnetic wave reflected from the surface is detected by an infrared light receiving element (28) (manufactured by Hamamatsu Photonics; MCT type). In 27), the detection component was converted into an infrared image, and a detector for detecting the state of the infrared component was used.

  Also in this implementation, it was confirmed in the same manner as the above-described evaluation method of the ink supply state, and it was stable in the range of approximately 41 μm to 43 μm, and the displacement of the ink film thickness state was substantially uniform and stable. It was confirmed.

  Since any implementation is substantially the same implementation method as the above-mentioned embodiment, the description regarding the implementation method is omitted.

  The above-described embodiments are merely representative examples, and it is needless to say that all embodiments exist within the scope described in the claims. In the embodiment, the detection of the infrared component is exemplified as the absorbance detection. However, if the detected absorbance component is ultraviolet light, the light receiving element is made of GaP type (manufactured by Hamamatsu Photonics) using the ultraviolet lamp as the light source. In the case of a fluorescent component, similar detection is possible by selecting a light receiving element of Si type (manufactured by Hamamatsu Photonics) using a fluorescent lamp as a light source.

It is an example of the side schematic diagram of the ink supply apparatus of the intaglio printing press in this invention. It is a partial enlarged view of the ink supply apparatus of the intaglio printing press in this invention. It is an example of the upper surface schematic diagram of the ink supply apparatus of the intaglio printing press in this invention. It is the side schematic diagram of the ink supply apparatus of the intaglio printing machine of another form in this invention. It is the side surface schematic explaining the ink film thickness measuring apparatus which attached the magnetic quantity detector and the absorbance detector in this invention. It is a schematic side view showing an ink supply device of a general intaglio printing press.

DESCRIPTION OF SYMBOLS 1 Ink film thickness measuring device 2 Ink discharge roller 3 Ink 4 Inkwell 5 Ink placement plate 6 Forming roller 7 Intaglio plate surface 8 Ink plate key 9 Plate cylinder 10 Impression cylinder 11 Wiping roller 12 Sliding roller 13 Analyzing device 14 Control device 15 Drive unit 16 Measurement value storage device 17 Reference value storage device 18 Comparison device 19 Frame 20 Side plate 21 Base shaft 22 Magnetic quantity detector 23 Absorbance detector 24 Measuring device mounting shaft 25 Magnetic body 26 Magnetic sensor 27 Imaging device 28 Infrared light receiving element 29 Infrared ray lamp

Claims (4)

  In an ink supply device of an intaglio printing press, an ink film thickness measuring device that is disposed in the vicinity of an ink discharge roller for feeding ink from an ink fountain and measures the ink film thickness on the ink discharge roller, and the ink film thickness measurement A measurement value storage device that is connected to the apparatus and stores a measurement value measured by the ink film thickness measurement device; a reference value storage device that presets and stores a reference value; a measurement value of the measurement value storage device and the reference An intaglio printing comprising: an analysis device comprising a comparison device for comparing with a reference value of a value storage device; and a control device for controlling the forward / backward movement of the ink fountain key based on the result of analysis by the analysis device Machine ink supply device.   2. The ink supply device for an intaglio printing press according to claim 1, wherein the ink film thickness measuring device is disposed downstream of an ink fountain key in the rotation direction of the ink discharge roller.   3. The ink supply device for an intaglio printing press according to claim 1, wherein the ink film thickness measuring device is accompanied by a magnetic quantity detector for detecting the magnetic quantity in the ink.   The ink supply apparatus for an intaglio printing press according to any one of claims 1 to 3, wherein the ink film thickness measuring device is attached with an absorbance detector for detecting absorbance in ink.

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