JP5239019B2 - Stencil printing machine - Google Patents

Description

  The present invention relates to a technique for preventing clogging of a plate cylinder, which is likely to occur when special ink that is quickly dried and fixed is used for specific purposes in stencil printing.

A stencil sheet made by making a stencil is wound around the outer periphery of the stencil sheet, and a cylindrical plate cylinder that is driven to rotate about its own central axis. And a printing pressure device that presses the fed printing paper against the outer peripheral surface of the plate cylinder, and forms a printed image by transferring the ink that has passed through the perforating plate making portion of the stencil base paper onto the printing paper. This type of stencil printing apparatus is already well known.
The ink used in such a stencil printing apparatus is one that never solidifies and dry even when left in the air. Specifically, an ink having a water-in-oil (W / O) emulsion structure is used. That is, the aqueous phase is uniformly dispersed in the oil phase. Even if the ink inside the printing press is in direct contact with the atmosphere, the structure can prevent the ink components from being denatured or cured, and has storage stability.
This requires that the stencil printing machine can be used without special cleaning operations when it is reused, even if it has been used without any special cleaning operation and has been left without being used for a long time. It is because it has been. When it is transferred onto the paper, pseudo drying is created by penetration between the fibers of the paper and evaporation of the aqueous phase in the ink. However, drying was insufficient because it was not drying or fixing by chemical reaction.

  Therefore, in the printed matter by the stencil printing device, the drying speed of the image ink is slow, and the fingers get dirty when the printed matter is taken out or aligned. If the paper with poor permeability such as coated paper cannot be printed, or if a solid image is printed, the back side of the paper on the output tray will stain the back side of the paper when it is stacked. There was a problem that a problem of depression occurred.

Thus, many proposals have been made so far in order to improve the drying property of printed images of stencil printing. For example, a method of changing to ultraviolet curable ink and irradiating the printed matter with ultraviolet rays after printing to cure is most effective (see, for example, Patent Documents 1 and 2).
There have also been proposed a method for heating the image surface of a printed matter with a heater or far infrared rays to promote water phase evaporation in the ink, and a method for promoting a reaction inside the ink by applying a high frequency to the image surface ink of the printed matter. .
Ink containing a component that hardens by reacting with oxygen in the air, paper that is dried using the action of vaporizing the solvent component in the ink by leaving it in the air or over time, paper There is also known a method of using an ink of a system that exhibits an effect of promoting a curing reaction inside an ink that has been transferred to a thin film and a function of curing an internal resin component.

The method of changing to ultraviolet curable ink and irradiating the printed matter with ultraviolet rays after printing has the safety and smell problems of the ultraviolet curable ink itself, the safety of the ultraviolet irradiation lamp and the problem of ozone generation. There is a problem that the ink itself is expensive and the ultraviolet irradiation device is also expensive.
The method of heating the image surface of the printed matter with a heater or far infrared rays to promote evaporation of the aqueous phase in the ink requires high-capacity equipment because it is a high-speed printing, and the water contained in the paper itself is evaporated. However, there is a problem that heat is consumed and effective drying of the ink cannot be expected, and the paper curls due to high heat.
When printing with high viscosity ink or powder ink and temporarily softening and lowering the viscosity by heating during printing, it is difficult to stably supply the ink, and it is difficult to soften the ink by the heat treatment unit. It becomes difficult to obtain stable and dry curing. The method of applying the powder on the printed material can only be expected to have an effect of preventing temporary back-lighting.

A method of using ink in which the resin component is cured integrally with the pigment by vaporizing the solvent component in the ink, or the resin component is cured integrally with the pigment by evaporating the aqueous component The method using such an ink has a great effect in ensuring the drying and fixing property of the printed matter, and the most important feature is that no special fixing device is required and the cost of the ink itself is small.
However, it is clear that the porous metal thin plate and the screen mesh constituting the cylindrical plate cylinder of the printing drum are clogged due to the solidification of the ink when left unused. This is because, in the portion where the ink spreads and the surface area is increased, the water and solvent in the ink easily evaporate from the portion that has been exposed to the air, so that the ink is dried at an early stage.

As a proposal by the present inventor to prevent such troubles due to drying, an ink cleaning mode is selected in the use of ink having improved dry fixability, and ink is consumed by paper passing printing of a predetermined pattern or unprinted base paper feeding plate discharge. There is an example of preventing plate cylinder clogging (see Patent Document 3).
In addition, although the purpose is completely different, as an example in which the configuration and part of the operation are similar, when a drum unit is equipped with a clock and its leaving time exceeds a preset time, auto-idling prior to the next plate making There is a proposal to execute the operation (see, for example, Patent Document 4). Although the purpose and usage are completely different, there is disclosed a concept that the used base paper is peeled and discharged after completion of printing (see Patent Document 5).

For example, if you do not use the printing machine for a week and then try to print it, the ink will become highly viscous and difficult to pass through the cylindrical plate cylinder, causing problems such as thinning of the image or loss of image. End up. In this case, there is a problem that it is necessary to clean the plate cylinder portion, which takes a lot of time, labor and cost.
In addition, there is a problem that the price of the special ink whose fixability is improved with the passage of time is higher than that of the conventional ink.

  Therefore, the first cylindrical plate cylinder unit that does not fix over the conventional type but uses safe and inexpensive ink, and a new special ink that fixes and solidifies over time after printing. Prepare both the second cylindrical plate cylinder unit to use the second cylindrical plate cylinder unit for applications that really need fixing, such as external prints, postcards, envelopes and cards. The method of using can be considered. In this case, if the second cylindrical plate cylinder unit is left unused for a long period of time, the ink becomes highly viscous and stuck in the plate cylinder and the screen portion, resulting in a clogged state. Therefore, there is a high possibility that a problem that a printed image does not appear at the next use will occur.

In addition, as a problem that occurs when using a new ink that is easy to dry and solidify, which is fixed over time after printing, the ink is composed through the stencil base porous paper that has been attached to the plate cylinder for a long time. As a result of the permeation of the low-viscosity oil component that spreads, the sensor unit that detects whether or not the stencil sheet is mounted on the outer periphery of the plate cylinder may easily cause erroneous detection.
Similarly, the low-viscosity oil component that constitutes the ink penetrates and spreads through the porous support Japanese paper of the stencil sheet that has been attached to the plate cylinder for a long period of time. And sticking may occur, and troubles such as misprinting and misfeeding are likely to occur.
In special inks that tend to dry and solidify, a resin is added, but this tends to increase the viscosity of the ink. Therefore, in order to make the viscosity an optimum value, it is necessary to add an oily component having a low viscosity or to increase the amount. That is, in the case of the dry solidification improving ink, the ratio of the oil phase component constituting the emulsion is larger than that of the conventional ink, and at the same time, the amount of low viscosity oily components (oils) is increased. . If the stencil sheet is left attached to the outer periphery of the drum, the low-viscosity oil component penetrates into the master Japanese paper and spreads.

Japanese Utility Model Publication No. 4-35188 JP-A-5-64878 JP 2007-283705 A JP 2006-62376 A JP 2005-153477 A

  The present invention provides a porous support for a stencil sheet that has been mounted on a plate cylinder for a long period of time even when a specific ink that is very effective for drying and fixing printed images in stencil printing and is easily dried and solidified is used. The purpose is to prevent the occurrence of various troubles that occur as a result of the low-viscosity oil-based components constituting the ink permeating through Japanese paper and spreading. Further, the purpose is to prevent a trouble from occurring by appropriately giving a warning that the plate cylinder and the screen are likely to be clogged with the passage of time due to the plate discharging operation.

In the first aspect of the present invention, the cylindrical plate cylinder unit that is wound around the outer periphery of the stencil sheet and is driven to rotate about its own central axis is configured to be detachable from the stencil printing apparatus main body. In the stencil printing apparatus, the plate cylinder unit identification sensor for identifying the installed cylindrical plate cylinder unit and the operation of peeling the used base paper attached to the cylindrical plate cylinder and discharging the plate are performed. A plate removal operation control device, a display device for performing a response waiting display or a warning display, a response means for responding to the response waiting display, and a time when the cylindrical plate cylinder unit is not used after the use is completed a, a plate cylinder unit nonuse time measuring device for measuring a distance, the plate cylinder unit identification sensor, used specific plate cylinder unit is used to dry and solidified easily ink When detecting the door is, when the printing using the particular plate cylinder unit is completed, or to continue printing if the seek response using the same plate cylinder unit, the response indicating not to continue printing If it is selected, control is performed to immediately execute the plate removal, and when the plate release is executed, the non-use time measuring device is activated, and when the value exceeds a predetermined value, the display device performs a predetermined operation. It is characterized by controlling to display the warning .

According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, a warning is displayed so that the specific plate cylinder unit is stored in a predetermined drum storage case .

In the invention described in claim 3, in the stencil printing device according to claim 1, characterized by warning that the particular plate cylinder unit is limited to a period for the future continue nonuse.

  According to the present invention, when the plate cylinder unit identification sensor detects that a specific plate cylinder unit is used, the same plate cylinder unit is used when printing using the specific plate cylinder unit is completed. The display unit confirms whether or not to continue printing, and if it is selected not to continue printing, the stencil is discharged immediately. As a result of the low-viscosity oil component that permeates the ink spreading through the base paper, the sensor unit that detects whether the stencil sheet is installed on the outer periphery of the plate cylinder causes false detection. It is possible to prevent the occurrence of troubles such as misprinting and feeding mistakes as a result.

FIG. 1 is a schematic view of mounting of each plate cylinder unit in the stencil plate-making printing apparatus of the present invention.
In the figure, reference numeral 1 is a stencil printing apparatus, 11 is a conventional ink plate cylinder unit A black, 12 is a conventional ink plate cylinder unit A red, 13 is a new special ink plate cylinder B black, and 15 is a plate cylinder unit identification sensor. , 16 indicate protrusions for identification.
As a method for identifying the type of plate cylinder, there are a mechanical method and an electrical method. If it is a mechanical method, for example, it is configured so that only the protrusions with oblique lines in the figure are shifted in the direction perpendicular to the paper surface, or only the protrusions with oblique lines in the figure, This can be done by indenting the unit with the unit mounting force and fixing the other protrusions so that they cannot move. Further, in the case of an electrical method, only the projecting portions hatched in the drawing may be fitted with a conductive cap, or conversely, an insulating cap may be fitted. In short, it is sufficient that the difference from the other protrusions can be identified. In this way, a protrusion placed in a different state from the other protrusions is expressed as a protrusion being in an ON state.
The stencil plate making and printing apparatus 1 has three cylindrical plate cylinder units so that they can be properly used. In this example, the cylindrical plate cylinder units 11 and 12 are a unit A in which conventional emulsion stencil printing ink is incorporated, and the cylindrical plate cylinder unit 13 is a unit B in which dry fixing property improving stencil printing ink is incorporated. is there. Further, 11 is set with black ink, and 12 is set with red ink. 13 is set with black ink.
Here, the plate cylinder unit identification sensor 15 is equipped with the black ink drum 11 of the unit A containing the conventional emulsion stencil printing ink, the red ink drum 12 of the unit A, or the dry fixing property. It is possible to identify whether the drum 13 of the enhanced stencil printing black ink unit B is mounted.
In the figure, each plate cylinder unit has three protrusions 16, and three types can be identified depending on which protrusion is in an ON state for each cylindrical plate cylinder.

The specific fixability improving ink used in the printing apparatus of the present invention will be described.
Conventionally, a water-in-oil emulsion ink has been used as an ink for a digital stencil printing apparatus, but usually does not contain a resin having a property of curing at room temperature. This means that even if the printing press is left unused for a long time, the ink will not become highly viscous and stick inside the plate cylinder, screen or plate cylinder when it is reused. This is because an image appears.
However, conversely, an image of a printed matter using such an ink will not dry or be fixed. In particular, when printing on a postcard, a business card, a card, or the like, the fact that the image is not fixed is problematic because it causes stains.

Therefore, in the present invention, as a method for improving the drying fixability, a method such as adding an alkyd resin or rosin-modified phenol to the oil phase component, or adding various water-soluble resins or resin emulsion latex to the water phase component. By using this method, a specific ink is used which is dried and fixed by increasing the viscosity over time. Of course, in the case of an ink containing such a resin, there is a risk that the ink is fixed on the plate cylinder or the screen portion when left for a long period of time, resulting in clogging and no image.
In the ink formulation for improving the dry fixability, the ratio of the oil phase component constituting the emulsion is increased as compared with the conventional ink. As a result, if the used base paper remains attached to the outer periphery of the plate cylinder for a long period of time, low-viscosity oil will be separated from the ink held by the plate cylinder and the screen, and this will be contained in the Japanese paper fiber portion of the used base paper. Will spread while penetrating. Ink with improved dry fixability has this tendency.

FIG. 2 is a schematic view showing a stencil sheet portion mounted on the outer surface of the cylindrical plate cylinder unit in the stencil plate making and printing apparatus of the present invention.
In the figure, reference numeral 17 is a cylindrical plate cylinder, 18 is a stencil sheet, 19 is an open / close clamper, and 20 is a detection point.
The stencil sheet 18 is wound around the outer periphery of the cylindrical plate cylinder 17, and the tip of the stencil sheet 18 is clamped by an openable clamper 19.
Reference numeral 18a denotes an area where the stencil sheet 18 is made, and this portion is blackened with ink because the ink passing through the plate cylinder opening portion fills the Japanese paper portion. The portions other than 18a are not attached with ink and appear white due to the Japanese paper portion.
The point of detecting that the stencil sheet is mounted on the outer surface of the cylindrical plate cylinder unit is 20, and the white of the stencil sheet is printed by a light reflecting sensor (not shown) provided on the stencil printing apparatus main body side. It comes to detect.

FIG. 3 is a schematic diagram showing the stencil sheet portion after being left for about a week with the printing completed.
In this case, the ink oil component in the plate making area 18a of the stencil sheet 18 as wound on the cylindrical plate cylinder 17 penetrates and spreads in the partial area 18b other than the area 18a. The low-viscosity oil is separated and penetrates and spreads through the Japanese paper portion, and the area of 18b is discolored so that it is slightly yellow rather than white.
For this reason, when the presence or absence of the base paper is detected by the detection sensor using the point 20 portion, the reflectance value decreases, and a false detection is made if there is no base paper even though the base paper is loaded.
When this erroneous detection occurs, at the start of the plate making, a new plate making base paper is wound without performing the plate removing process, resulting in double winding of the stencil base paper.

If left for a long period of time, the low-viscosity oil will separate and spread through the Japanese paper part, and eventually reach the clamper 19 part. The members of the clamper 19 and the film surface of the stencil sheet 18 will be in close contact with the oil. It will be difficult to peel off. Since the member of the clamper 19 is made of a rubber magnet, it is easily affected by oil, and if the oil is present, it is in close contact with the base paper and is difficult to peel off. Furthermore, there is a possibility that the base paper is torn at the clamper portion when the discharged plate is peeled off.
Therefore, in the case of a plate cylinder unit with special ink for improving fixability, if the used base paper is clamped and left as it is, the above problem will occur. That is the gist of the present invention.
When printing is completed, it is confirmed whether to continue printing as it is, and if it is found that the printer is not in use according to the response result, the plate removal operation is performed.

FIG. 4 is a block diagram of each part in the stencil printing apparatus of the present invention.
In the figure, reference numeral 21 is a non-use time measuring device for the plate cylinder unit 13, 22 is a storage device, 30 is a control device, 31 is a discharge plate drive device, 32 is an operation panel, 33 is a liquid crystal display unit, and 34 is a response unit. Show.
FIGS. 5a and 5b are control flow charts in the stencil printing apparatus of the present invention.
Here, the control process will be described using an actual printing operation as an example.
A cylindrical plate cylinder unit 13 (dry stencil improving type stencil printing ink black) was mounted on the stencil plate making printing apparatus 1, and 500 sheets were printed by this cylindrical plate cylinder unit 13. That is, the document was set, the number of copies to be printed was set to 500 from the operation panel 32, and the plate making start key was pressed. The printing process was performed from the plate making process, and 500 printing operations were completed.
The control device 30 of the stencil printing apparatus 1 performs printing in a state where the special ink plate cylinder unit 13 is mounted, and at the stage of confirming that the printing has been completed, displays the necessary display as set in advance. Controlled. Information necessary for display, current device status, and the like are all stored in the storage device 22.

That is, the following text for confirmation is displayed on the liquid crystal display unit (touch panel type) 33 of the operation panel. This is the “first confirmation display”.
“Would you like to continue printing with this plate cylinder unit?” → “Yes”, “No”
For example, since today's printing is completed, “No” is selected and instructed from the response unit 34.
If “Yes” is selected, printing should be performed with the same plate cylinder unit, so that the used plate can be discharged and the next plate-making operation and printing operation can be used continuously. When the printing is completed, the above confirmation text is displayed again.

Since “No” is selected and instructed, the following “second confirmation display” appears.
“Is it OK to carry out the plate removal operation?” → “Yes”, “No”
Therefore, “Yes” is selected and instructed from the response unit 34.
If “No” is selected, it is determined that the printing will continue to be used even though the plate removal operation will not be performed, so there will be no problem if the next printing operation is started within 12 hours. If the next printing is not started after 12 hours, the “first warning display” is displayed. This warning is for example
“Remove the plate cylinder unit and store it in the drum case”.

Since “Yes” is selected from the response unit 34, the control device 30 of the stencil printing apparatus 1 sends a command to the discharge plate driving device 31 and automatically removes and stores the used base paper currently mounted on the plate cylinder. Perform the operation. Thereafter, the control device 30 controls the liquid crystal display unit 33 of the operation panel 32 to display “first warning display” and “second warning display” texts. For example, the following two sentences.
"Please remove the plate cylinder unit and store it in the drum case"
"Please use this printing cylinder unit for printing again within two weeks"

Then, after performing the plate removal operation, the operator removes the plate cylinder unit and stores it in a dedicated drum storage case.
When the control unit 30 of the stencil printing apparatus 1 detects that the plate cylinder unit has been removed by the plate cylinder unit identification sensor 15, the control unit 30 starts measuring elapsed time using the non-use time measuring device 21.
Of course, even if the plate cylinder unit is not removed, the elapsed time measurement from there is started.
As a result of the elapsed time measurement, when the set value 1 (for example, 300 hours: about 2 weeks) has passed, “third warning” is displayed on the liquid crystal display unit 33 at that time. If the power is turned off at that time, control is performed so that the “third warning” is displayed as soon as the power is turned on.

The “third warning” is, for example, the following display.
“The non-use time of the specified ink plate cylinder unit has exceeded the allowable limit, so immediately install a new base paper and start printing.”
If the specific ink plate cylinder unit is mounted and the plate-making printing operation is performed before the set value 1 as a result of the elapsed time measurement, the elapsed time measurement is canceled at that time. When the printing is completed, the “first confirmation display” is performed in the same manner as described above. The following is the same as above.
If the “second warning display” “please remove the plate cylinder unit and store it in the drum case” is displayed, but the plate cylinder unit is not removed, the non-use time measuring device 34 Is used to measure the elapsed time, and when the value has passed a set value 2 (a time shorter than the set value 1, for example, 150 hours: about 1 week), the liquid crystal display unit 33 causes the “third warning”. Is displayed. Each of these warnings is called a predetermined warning.
If the plate cylinder unit is removed, it is judged that it is stored in a dedicated drum case, but if the plate cylinder unit is not removed, problems may occur in a shorter time. Instead of setting value 1, setting value 2 which is a shorter time is used. These values are called predetermined values. Since the specific numerical value of the predetermined value varies depending on the characteristics of the ink used, it is set in the storage device for each ink. For such setting, for example, by pressing a “function key” on the operation panel 32 which will be described later, a list of necessary functions is displayed on the liquid crystal display unit, and a desired function is touched from among them to change the numerical value. Input can be made from the input numeric keypad 35.

FIG. 6 is a diagram showing an operation unit in the stencil printing apparatus of the present invention.
In the figure, numeral 35 is a numeric input numeric keypad, 36 is a plate making start key, 37 is a printing start key, 38 is a stop key, 39 is a print set number display section, and 40 is a red lamp.
In normal basic printing operation, an original is set in the scanner unit, the number of prints to be printed is indicated by the numeric input numeric key 35, the print setting number is displayed on the print setting number display unit 39, and the plate making operation is performed by the plate making start key 36. The required number of prints are automatically executed by simply pressing the print start key 37. If you need to change the type of ink for special printing and change the specified value, press the function key to display a list of functions on the LCD, and select the desired key from the list. By touching, the necessary numeric values can be input from the numeric input numeric keypad 35. The entered numerical value is stored in a storage device and used when a warning is displayed. If the special ink that is used regularly is determined, the predetermined value corresponding to the ink is stored in the storage device as a default value, and the default value is used unless otherwise specified. Good.
In the case of confirmation display or warning display, the red lamp 40 is turned on and the above-mentioned various sentences are displayed on the liquid crystal display unit 32.

It is the schematic of mounting | wearing of each plate cylinder unit in the stencil plate-making printing apparatus of this invention. It is a figure which shows the stencil paper of the state with which the outer periphery of the cylindrical plate cylinder unit was mounted | worn. It is a figure which shows the stencil sheet | seat after leaving it for one week with a printing completion state. It is a block diagram of each part in the stencil plate-making printing apparatus of the present invention. It is a control flow figure in the stencil plate-making printing apparatus of this invention. It is a control flow figure in the stencil plate-making printing apparatus of this invention. It is a figure which shows the operation part in the stencil plate-making printing apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 11 Plate cylinder unit A black 12 Plate cylinder unit A red 13 Plate cylinder unit B black 15 Plate cylinder unit identification sensor 17 Cylindrical plate cylinder 18 Stencil sheet 20 Detection point 33 Liquid crystal display part

Claims (3)

In a stencil printing apparatus in which a cylindrical stencil cylinder unit that is wound around and attached to the outer periphery of a stencil sheet that has been stenciled and is driven to rotate about its central axis is configured to be detachable from the stencil printing apparatus body
A plate cylinder unit identification sensor for identifying the mounted cylindrical plate cylinder unit;
A plate removal operation control device for performing an operation of peeling and discharging the used base paper mounted on the cylindrical plate cylinder;
A display device for displaying a response waiting display or warning;
Response means for responding to the response waiting indication;
A plate cylinder unit non-use time measuring device that measures a time interval that is not used after the use of the cylindrical plate cylinder unit is completed ,
When the plate cylinder unit identification sensor detects that a specific plate cylinder unit using an ink that is easy to dry and solidify is used, the same is performed when printing using the specific plate cylinder unit is completed. A response is issued to determine whether or not to continue printing using the plate cylinder unit. When a response indicating that printing is not continued is selected, control is performed so that the plate is discharged immediately. A stencil printing apparatus , wherein a non-use time measuring device is operated, and when the value exceeds a predetermined value, control is performed such that a predetermined warning is displayed by the display device. In the stencil printing apparatus according to claim 1,
A stencil printing apparatus , wherein a warning is displayed so as to store the specific plate cylinder unit in a predetermined drum storage case . In the stencil printing apparatus according to claim 1 ,
A stencil printing apparatus, wherein a warning is displayed that there is a limit to a period during which the specific plate cylinder unit is not continuously used .

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