JP4421717B2 - Stencil printing method and stencil printing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stencil printing method and a stencil printing apparatus which perform printing by heating and perforating a master base paper to make a master, and wrapping the master thus made around an outer peripheral surface of a plate cylinder.
[0002]
[Prior art]
The stencil printing apparatus has a substantially cylindrical plate cylinder that is rotationally driven about an axis, and a plate making unit that makes a master by heating and melting and punching a master base paper. The ink is wound around the outer peripheral surface of the cylinder and the printing paper is pressed against the master wound around the outer peripheral surface of the plate cylinder so that the ink supplied to the inside of the plate cylinder oozes out from the master and is printed on the printing paper.
[0003]
A master base paper is widely used which is formed by bonding a thermoplastic resin film and a porous support, and the master is made by heating, melting and perforating portions of the thermoplastic resin film. The porous support gives the master stiffness, and Japanese paper, synthetic fiber, or a mixture of Japanese paper and synthetic fiber is used. The master is wound around the plate cylinder with the thermoplastic resin film facing outward, and the thermoplastic resin film and the printing paper come into contact during printing.
[0004]
There are various types of master base paper in which a thermoplastic resin film and a porous support are bonded together, for example, a type in which the thickness of the porous support is the same and the thickness of the thermoplastic resin film is different. A type in which the thickness of the thermoplastic resin film is the same and the thickness of the porous support is different.
[0005]
Comparing the ease of use of master base papers with different thermoplastic resin film thicknesses, the following can be said. A master base paper having a thin thermoplastic resin film can make the master in a short time, and may require less heat energy for making the master. On the other hand, a master base paper with a thick thermoplastic resin film takes time to make a master plate, and the thermal energy required for plate making increases.
[0006]
In addition, when comparing the usability of master base papers with the same thermoplastic resin film thickness and different porous support material thickness, the master with a thick porous support material The amount of ink contained in the ink increases, and the amount of ink discarded together with the master increases when the master is discharged.
[0007]
Therefore, under general printing conditions, a master base paper with a thin thermoplastic resin film or a master base paper with a thin porous support if the thickness of the thermoplastic resin film is the same. It is advantageous to use
[0008]
However, there are many types of printing paper used in stencil printing devices, such as printing paper (general printing paper) that is thin and uniform in overall thickness, such as copy paper, and postcards. There are printing papers with different thicknesses such as thick printing papers and envelopes. The number of printed sheets may be large or small.
[0009]
Here, the master base paper with a thin thermoplastic resin film and the master base paper with a thin porous support are master base paper with a thick thermoplastic resin film and a master with a thick porous support. Compared to the base paper, the printing durability is low. For this reason, when printing is performed on printing paper that has a large pressing force at the time of contact with the master, such as an envelope or a postcard, or when the number of printed sheets is large, a master base paper with a thin thermoplastic resin film, or When a master made from a master base paper having a thin porous support is used, the thermoplastic resin film is worn and cut or has holes. If the thermoplastic resin film is cut or a hole is formed during the printing operation, the ink leaks from the cut part or the part having the hole, and the printing paper becomes dirty.
[0010]
Therefore, conventionally, when printing is performed on printing paper such as an envelope or a postcard, or when the number of printed sheets is large, either of the following two methods is employed.
[0011]
The first method uses a master made from a master base paper with a thin thermoplastic resin film or a master made from a master base paper with a thin porous support, and the number of printed sheets reaches a predetermined number. At this point, the printing operation is temporarily interrupted, the master in use is discarded, the master having the same contents is made again, the master made again is wound around the plate cylinder, and the printing operation is resumed.
[0012]
In the second method, two types of master base papers, for example, two types of master base papers having different thicknesses of thermoplastic resin films, or the thicknesses of the thermoplastic resin films are the same, but the thickness of the porous support is used. Prepare two types of master base papers with different overall thickness because they are different, and replace the master base paper according to the printing conditions such as the type of printing paper used and the number of prints. This is a method of using a master that has been made.
[0013]
[Problems to be solved by the invention]
However, as in the first method, the same master is made again in the middle of the printing operation. The master is wound around the plate cylinder, the same master is made again, the master is made again. Since the printing operation is temporarily interrupted due to the winding of the paper, the work efficiency of the printing operation is reduced. In addition, the number of printed sheets by the master made again is small, and the cost of the master base paper tends to increase.
[0014]
On the other hand, according to the second method, according to the method of replacing the master base paper to be used according to the printing conditions such as the printing paper to be used and the number of prints, the master base paper is troublesome to attach and detach, and as a result In addition, the work efficiency of the printing work is reduced.
[0015]
Therefore, the present invention prevents master cuts and perforations from occurring during printing by selecting a master base paper having a printing durability suitable for printing conditions such as the printing paper to be used and the number of prints, and making the master. Another object of the present invention is to provide a stencil printing method and a stencil printing apparatus that can quickly perform master plate-making from a master base paper that meets printing conditions.
[0016]
[Means for Solving the Problems]
According to the first aspect of the present invention, a master base paper is heated and melt-pierced by a plate making section to make a master, and the master thus made is wound around an outer peripheral surface of a substantially cylindrical plate cylinder, and the master wound around the plate cylinder In the stencil printing method, printing is performed on the printing paper by causing the ink supplied into the plate cylinder to ooze out from the master by pressing the printing paper on the printing plate. At least two different master base papers are held, and one of the master base papers is selected according to the printing conditions, and the selected master base paper is supplied to the plate making unit to make the master.
[0017]
Here, the master base paper differs in usability depending on the type, for example, the difference in the thickness of the thermoplastic resin film, and the master base paper with a thin thermoplastic resin film and a low printing durability can be used for a short time. And requires less heat energy for plate making. On the other hand, a master made from a master base paper having a high thermoplastic resin film thickness and high printing durability is not easily worn due to its high printing durability, and is unlikely to be cut or perforated.
[0018]
Therefore, from at least two types of master base papers having different printing strengths held in the vicinity of the plate making unit, master base papers having high printing strength depending on the printing conditions, for example, the type of printing paper used and the number of printed sheets. By making a master and making a master, it is prevented that the master wears out due to contact with the printing paper during printing, and it is prevented from being cut or pierced. Leakage and contamination of the printing paper are prevented. This eliminates the need to suspend the printing operation and make the same master again in order to prevent the master from being cut or perforated due to wear, thereby improving the work efficiency of the printing operation. On the other hand, by selecting a master base paper with low printing durability according to the printing conditions and making the master, the master can be made in a short period of time, improving the work efficiency of the printing work and the heat required for making the master. Lower energy costs due to less energy. In addition, since at least two types of master base papers are held in the vicinity of the plate making unit, it is not necessary to attach or detach the master base papers according to the printing conditions. From this point, the work efficiency of the printing work is improved.
[0019]
According to a second aspect of the present invention, in the stencil printing method according to the first aspect, at least two types of the master base paper are formed by laminating a thermoplastic resin film and a porous support, and the thermoplastic resin film The thickness or the entire thickness of the master base paper is different.
[0020]
Therefore, since the master made from a master paper with a thick thermoplastic resin film has high printing durability and is not easily worn, the thermoplastic resin film is cut even when the printing paper is thick or the number of printed sheets is large. It is possible to prevent ink from leaking out from the cut or perforated portion without causing any ink or holes to be made and the printing paper from becoming dirty. In addition, since the thickness of the porous support is large, the master made from a master paper having a large overall thickness has a higher function as a cushioning material for the porous support, and therefore the printing durability is increased. Even when the printing paper is thick or the number of printed sheets is large, the thermoplastic resin film does not cut or get a hole, and ink leaks from the cut or hole. The printing paper is prevented from getting dirty.
[0021]
On the other hand, when a master is made from a master base paper having a thin thermoplastic resin film, the master can be made in a short time, and the thermal energy required for making the plate is reduced. In addition, a master made from a master base paper having a thin porous support and a thin entire substrate reduces the amount of ink that is discarded while being contained in the porous support when the master is discharged, thereby reducing waste of ink. .
[0022]
The invention described in claim 3 has a substantially cylindrical plate cylinder that is rotationally driven about an axis, and a plate making section for making a master by heating and melting and punching a master base paper, and on the outer peripheral surface of the plate cylinder. In a stencil printing apparatus for printing on the printing paper by causing the ink supplied to the inside of the plate cylinder to bleed out from the master by pressing the printing paper against the wound master, selected according to printing conditions At least two master base paper holders for holding master base papers having different printing durability, a master base paper supply mechanism for supplying the selected master base paper to the plate making section, and a conveyance speed of the master base paper at the plate making section; Variable means for varying at least one of thermal energy per unit time applied to the master base paper during plate making according to the master base paper supplied to the plate making section. .
[0023]
Here, the master base paper differs in usability depending on the type, for example, the difference in the thickness of the thermoplastic resin film, and the master base paper with a thin thermoplastic resin film can be used for master making in a short time and for making a master plate. Requires less heat energy. On the other hand, a master made from a master base paper having a thick thermoplastic resin film is difficult to wear due to its high printing durability, and is unlikely to be cut or perforated.
[0024]
Therefore, when a master base paper is selected according to printing conditions, for example, the type of printing paper to be used and the number of printed sheets, the selected master base paper is supplied to the plate making section by the master base paper supply mechanism, and the supplied master base paper The master is made from. When the selected master base paper has high printing durability, the master made from the master base paper is prevented from being worn out due to contact with the printing paper at the time of printing and being cut or punched. Further, it is possible to prevent the ink from leaking out from the cut or perforated portion and the printing paper from becoming dirty. This eliminates the need to suspend the printing operation and make the same master again in order to prevent the master from being cut or perforated due to wear, thereby improving the work efficiency of the printing operation. On the other hand, if the selected master base paper has a low printing durability, the master can be made in a short time, which increases the work efficiency of the printing operation and reduces the heat energy required for making the plate. Energy costs will be reduced. In addition, since at least two master base paper holders are provided and master base papers having different printing strengths are held in the master base paper holders, there is no need to replace the master base paper according to the printing conditions. This also increases the work efficiency of the printing work.
[0025]
Further, the master base paper supplied to the plate making section changes at least one of the conveyance speed of the master base paper in the plate making section and the heat energy per unit time applied to the master base paper at the time of plate making by the variable means. In the section, appropriate plate making is performed according to the supplied master paper, and a good master is made.
[0026]
According to a fourth aspect of the present invention, in the stencil printing apparatus according to the third aspect, a paper type input means for inputting a type of printing paper to be used as a printing condition, and the plate making unit according to an input from the paper type input means Master base paper selection means for selecting the master base paper supplied to the printer.
[0027]
Therefore, the master base paper supplied to the plate making unit is automatically selected by the master base paper selecting unit according to the type of printing paper input by the paper type input unit, and therefore, the selection of the master base paper to be used may be wrong. The master plate making according to the printing conditions is surely performed.
[0028]
According to a fifth aspect of the present invention, in the stencil printing apparatus according to the third or fourth aspect, the number of printed sheets is input as a printing condition, and is supplied to the plate making unit in response to an input from the number of printed sheets input means. Master base paper selecting means for selecting the master base paper.
[0029]
Therefore, the master base paper supplied to the plate making unit is automatically selected by the master base paper selecting means according to the number of prints input by the print number input means, so that the selection of the master base paper to be used is not mistaken. Master master making according to printing conditions is performed reliably.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a schematic structure of a main part of the stencil printing apparatus. In this stencil printing apparatus, a porous cylindrical plate cylinder 1 is provided so as to be rotatable about an axis. Around the plate cylinder 1, master base paper holding units 2a and 2b, a plate making unit 3, a plate discharging unit are provided. 4, a press roller 5, a registration roller 6, a peeling claw 7, and the like are arranged.
[0031]
One master base paper holding unit 2a is provided with a holding shaft 8a and a storage case 9a, and a long master base paper 10a wound in a roll shape is held on the holding shaft 8a. A holding shaft motor 11a that rotates the holding shaft 8a forward and reverse is connected to the holding shaft 8a. The other master base paper holding section 2b is provided with a holding shaft 8b and a storage case 9b, and a long master base paper 10b wound in a roll shape is held on the holding shaft 8b. A holding shaft motor 11b that rotates the holding shaft 8b forward and reverse is connected to the holding shaft 8b. The master base papers 10a and 10b are formed by laminating a thermoplastic resin film and a porous support, and the thickness of the porous support is the same in the master base papers 10a and 10b, but the thickness of the thermoplastic resin film is the same. The master base paper 10a is thin and the master base paper 10b is thick. That is, the master base paper 10a has a low printing durability, and the master base paper 10b has a high printing durability.
[0032]
Between the master base paper holding units 2 a and 2 b and the plate making unit 3, a master base paper receiving unit 12, a calling roller 13, and a detection sensor 14 are provided. The holding shafts 8a and 8b, the holding shaft motors 11a and 11b connected to the holding shafts 8a and 8b, the calling roller 13, the calling motor 15 (see FIG. 4) connected to the calling roller 13, and the master base paper holding unit 2b A master base paper supply mechanism 17 that supplies the master base papers 10a and 10b to the plate making unit 3 is formed by a slide motor 16 (see FIG. 3) that slides.
[0033]
The plate making section 3 is a place where the master base paper 10a, 10b supplied from the master base paper holding sections 2a, 2b is heated, melted and punched to make the master 10 and is connected to a stepping motor 18 (see FIG. 5) and rotated. Platen roller 19, thermal head 20 having a large number of heating elements and pressed against the outer peripheral surface of platen roller 19, transport rollers 21 and 22, transport motor 23 connected to transport rollers 21 and 22, cutter 24, guide It is comprised by the board 25 grade | etc.,. When the master base papers 10a and 10b supplied by the master base paper supply mechanism 17 are conveyed through the plate making section 3, the heat generating elements of the thermal head 20 generate heat according to image data output from a scanner device (not shown) or the like. Then, the master 10 corresponding to the image data is made. The master 10 thus made is transported by transport rollers 21 and 22 and cut to a predetermined length by a cutter 24.
[0034]
An outer peripheral surface of the plate cylinder 1 is provided with a stage 26 and an openable / closable clamper 27 connected to an open / close mechanism (not shown). As shown in FIG. 1, the plate cylinder 1 is stopped at a position where the clamper 27 faces the guide plate 25, and at that position, the clamper 27 is opened as indicated by a two-dot chain line, and the master 10 is conveyed there. The clamper 27 is closed when the leading end of the master 10 reaches between the clamper 27 and the stage 26, and the leading end of the master 10 is held between the clamper 27 and the stage 26. And after the front-end | tip part of the master 10 is clamped between the clamper 27 and the stage 26, the master 10 is wound around the outer peripheral surface of the plate cylinder 1 by rotating the plate cylinder 1 clockwise.
[0035]
Inside the plate cylinder 1, there is a minute gap between the ink pipe 28 serving as a support shaft that is positioned on the axis of the plate cylinder 1 and supports the plate cylinder 1 rotatably, and the inner peripheral surface of the plate cylinder 1. An ink roller 29 that is rotationally driven in the same direction as the plate cylinder 1 (clockwise direction indicated by an arrow), a doctor roller 30 disposed with a small gap between the outer peripheral surface of the ink roller 29, and the like are provided. An ink reservoir 31 in which the ink supplied through the ink pipe 28 is stored is formed between the outer peripheral surface of the ink roller 29 and the outer peripheral surface of the doctor roller 30.
[0036]
The plate removal unit 4 is a place where the master 10 wound around the plate cylinder 1 is peeled off and discarded, and includes a plate discharge roller 32 for peeling the master 10 from the plate cylinder 1 and a storage box 33 for storing the peeled master 10. Yes.
[0037]
The press roller 5 is supported at the other end of an arm 35 rotatably supported at one end by a support shaft 34 so as to be rotatable around its axis. The press roller 5 is brought into contact with and separated from the outer peripheral surface of the plate cylinder 1 by the arm 35 driven by a drive mechanism (not shown) turning around the support shaft 34.
[0038]
The registration roller 6 takes a timing to send the printing paper S fed from a paper feed tray (not shown) between the plate cylinder 1 and the press roller 5. When the printing paper S is sent between the plate cylinder 1 and the press roller 5, the press roller 5 rotates to the plate cylinder 1 side and presses the printing paper S against the master 10 wound around the plate cylinder 1. Then, printing on the printing paper S is performed.
[0039]
The peeling claw 7 enters between the master 10 wound around the outer peripheral surface of the plate cylinder 1 and the printing paper S on which printing has been performed by being pressed against the master 10, and the printing paper S on which printing has been completed is transferred to the master 10. Remove from.
[0040]
FIG. 3 is a front view showing a slide mechanism for sliding the master base paper holding unit 2b. A slide block 36 is fixed to the storage case 9b of the master base paper holding unit 2b, and the slide motor 16 is connected to the slide block 36. By rotating the slide motor 16 forward and backward, the master base paper holding unit 2b slides in a direction (arrow A direction) along with the slide block 36 toward and away from the calling roller 13.
[0041]
FIG. 4 is a front view showing a driving mechanism of the calling roller 13. One end of a pair of arms 38 is fixed to both ends of the support shaft 37, and a rotating shaft 39 is rotatably held at the other end of the arm 38, and the calling roller 13 is fixed to the rotating shaft 39. The calling motor 15 is connected to the calling roller 13 via a rotating shaft 39 or a gear (not shown). Further, one end of the arm 40 is fixed to one end of the support shaft 37, and a solenoid 41 and one end of a spring 42 are connected to the other end of the arm 40. When the solenoid 41 is energized, the arms 40 and 38 are rotated in the counterclockwise direction (arrow B direction) around the support shaft 37, and the calling roller 13 is separated from the master base paper receiving portion 12 or the front end portion of the storage case 9b. To do. When the energization of the solenoid 41 is interrupted, the arms 40 and 38 are rotated clockwise around the support shaft 37 by the pulling force of the spring 42, and the calling roller 13 is moved to the master base paper receiving portion 12 or the front end portion of the storage case 9b. Abut.
[0042]
FIG. 5 is a block diagram showing a part of the control circuit configuration of the stencil printing apparatus. This stencil printing apparatus is provided with a CPU 43 for controlling various devices in accordance with a control program, and a ROM 44 for storing fixed data such as a control program and a RAM 45 for storing various variable data are connected to the CPU 43. Yes. Further, the CPU 43 includes a detection sensor 14 as various devices, holding shaft motors 11a and 11b, a calling motor 15, a slide motor 16, a stepping motor 18, a transport motor 23, an operation panel 46 on which numeric keys and various keys are arranged, and the like. Are connected via an interface 47. The operation panel 46 functions as a paper type input unit for inputting the type of printing paper S to be used and a print number input unit for inputting the number of prints.
[0043]
FIG. 6 is a flowchart for explaining processing contents relating to plate making of the master 10 and printing using the master 10 in the stencil printing apparatus. After the printing conditions such as the type of printing paper S to be used and the number of printed sheets are input from the operation panel 46, a series of processing starts when the start key is pressed. First, it is determined whether the printing paper S to be used is plain paper (step S1). Here, the plain paper means a printing paper having a uniform overall thickness and a thin thickness, such as a copy paper. If the printing paper S to be used is not plain paper (N in Step S1), the master base paper 10b having a high printing durability is selected as the master base paper to be used (Step S2), and the master base paper selection means is executed here. The
[0044]
If it is determined that the printing paper S to be used is plain paper (Y in step S1), it is determined whether or not the number of printed sheets is equal to or less than a set value (step S3). Here, this set value is a value that can be set by the user as needed. If the number of printed sheets is equal to or greater than the set value (N in step S3), the master base paper 10b having a high printing durability as the master base paper to be used is selected (step S2), and the master base paper selecting means is executed here. The
[0045]
When the printing paper S to be used is plain paper (Y in step S1) and the number of printed sheets is equal to or less than the set value (Y in step S3), the master base paper 10a having a low printing durability as the master base paper to be used. Is selected (step S4), and master raw paper selection means is executed here.
[0046]
When the master base paper 10a (or 10b) to be used is selected, whether or not the selected master base paper 10a (or 10b) is the same as the master base paper 10a (or 10b) used during the previous plate making (printing). Is determined (step S5). If it is determined that they are the same, the leading end of the selected master base paper 10a (or 10b) has reached the plate making section 3, and from this state, the holding shafts 8a and 8b, the calling roller 13, the platen The roller 19 and the transport rollers 21 and 22 are driven to rotate forward, the master base paper 10a (or 10b) is supplied to the plate making unit 3, the thermal head 20 is driven to generate heat, and the master 10 is made (step S6). Here, the normal rotation driving of the holding shafts 8a and 8b, the calling roller 13, the platen roller 19, and the conveying rollers 21 and 22 supplies the master base paper 10a (or 10b) from the master base paper holding parts 2a and 2b to the plate making part 3. It means that it is driven in the direction. When the master 10 is made, the master 10 is wound around the outer peripheral surface of the plate cylinder 1 and printing is performed (step S7), and a series of plate making and printing processes is completed when printing of the input number of printed sheets is completed.
[0047]
When it is determined that the selected master base paper 10a (or 10b) is different from the master base paper 10a (or 10b) used at the time of the previous plate making (printing) (N in step S5), the supplied master base paper 10a (Or 10b) is switched (step S8). After this switching is performed, the holding shafts 8a and 8b, the calling roller 13, the platen roller 19, and the transport rollers 21 and 22 are driven to rotate forward, the thermal head 20 is driven to generate heat, and the master 10 is engraved ( In step S6, printing is performed (step S7).
[0048]
When the master 10 is made, at least one of the conveyance speed of the master base paper 10a (or 10b) in the plate making section 3 and the heat energy per unit time applied to the master base paper 10a (or 10b) at the time of plate making is sent to the plate making section 3. The variable is made according to the type of the master base paper 10a (10b) to be supplied, and the variable means is executed here. Specifically, when the master base paper 10a having a thin thermoplastic resin film and a low printing durability is used, the variable means is executed at a higher transport speed during plate making or applied during plate making. Reduce heat energy per unit time. On the other hand, when the master base paper 10b having a thick thermoplastic resin film and high printing durability is used, the conveyance speed at the time of plate making is reduced, or the thermal energy per unit time applied at the time of plate making is increased.
[0049]
In step S8, the supplied master base paper 10a (or 10b) is switched from the master base paper 10a to the master base paper 10b or from the master base paper 10b to the master base paper 10a.
[0050]
When switching from the master base paper 10a to the master base paper 10b, the transport roller 21, the platen roller 19, the calling roller 13, and the holding shaft 8a are driven in reverse to wind the master base paper 10a toward the master base paper holder 2a. After the leading end of the wound master base paper 10a is detected by the detection sensor 14, the reverse rotation driving of the conveying roller 21, the platen roller 19, the calling roller 13, and the holding shaft 8a is stopped. Thereafter, by energizing the solenoid 41, the arms 40 and 38 are rotated around the support shaft 37 in the direction of arrow B, and the calling roller 13 extends on the master base paper receiving portion 12 (more specifically, on the master base paper receiving portion 12). Separate from the master base paper 10a). Thereafter, the master base paper holding portion 2b is slid to a position approaching the calling roller 13 (position shown in FIG. 2) by driving the slide motor 16, and the leading end of the storage case 9b is moved between the master base paper receiving portion 12 and the calling roller 13. The slide motor 16 is stopped driving after the leading end of the storage case 9b has entered the predetermined position. Thereafter, the energization of the solenoid 41 is cut off, so that the calling roller 13 is rotated in the clockwise direction and is brought into contact with the front end portion of the storage case 9b (the state shown in FIG. 2), and the master base paper 10b is supplied to the plate making unit 3. It becomes possible. From this state, the master base paper 10b is supplied to the plate making unit 3 by driving the holding shaft 8b, the calling roller 13, the platen roller 19, and the transport rollers 21 and 22 to rotate forward.
[0051]
When switching from the master base paper 10b to the master base paper 10a, the transport roller 21, the platen roller 19, the calling roller 13, and the holding shaft 8b are driven in reverse to wind the master base paper 10b toward the master base paper holding section 2b. After the leading end of the wound master base paper 10b is detected by the detection sensor 14, the reverse rotation driving of the conveying roller 21, the platen roller 19, the calling roller 13, and the holding shaft 8b is stopped. Thereafter, by energizing the solenoid 41, the arms 40 and 38 are rotated in the direction of arrow B, and the calling roller 13 extends to the front end portion of the storage case 9b (more specifically, the front end portion of the storage case 9b). Separate from the master base paper 10b). After that, the master base paper holding unit 2b is slid to a position (position shown in FIG. 1) away from the calling roller 13 by driving the slide motor 16, and the drive of the slide motor 16 is stopped. Thereafter, the energization of the solenoid 41 is cut off, whereby the calling roller 13 is rotated in the clockwise direction and brought into contact with the master base paper receiving portion 12. From this state, the master base paper 10a is supplied to the plate making unit 3 by driving the holding shaft 8a, the calling roller 13, the platen roller 19, and the transport rollers 21 and 22 to rotate forward.
[0052]
In such a configuration, when the printing conditions such as the type of printing paper S to be used and the number of printed sheets are input from the operation panel 46 and a series of plate making and printing processes is started, the type of printing paper S and the number of printed sheets Either one of the master base papers 10a (or 10b) is selected according to the printing conditions (steps S2 and S4), and printing is performed using the master 10 made from the selected master base paper 10a (or 10b).
[0053]
Here, when printing on a printing paper S partially different in thickness such as an envelope, or on a thick printing paper S such as a postcard, or when the number of printed sheets is equal to or greater than a set value, a thermoplastic resin film The master 10 is made from the master base paper 10b which is thick and has high printing durability. The master 10 made from the master base paper 10b is hard to be worn due to high printing durability, and even if the master 10 and the printing paper S are repeatedly in strong contact, the thermoplastic resin film is not cut or perforated, Ink does not leak out from the cut or perforated portions, and the printing paper S does not get dirty. Thereby, in order to prevent the thermoplastic resin film from being cut or having a hole in the printing operation, the printing operation is temporarily interrupted, the master 10 being used is discharged, the same master 10 is made again, There is no need to wrap the master 10 that has been made into a plate cylinder 1 again, and the work efficiency of the printing operation is improved.
[0054]
Further, when the master 10 is made from the master base paper 10b, the conveyance speed of the master base paper 10b at the time of plate making becomes slow, or the heat energy per unit time applied to the master base paper 10b at the time of plate making increases. For this reason, even if the thermoplastic resin film becomes thick, the master 10 can be well made from the master base paper 10b.
[0055]
On the other hand, when printing is performed on a printing sheet S having a small thickness and a uniform overall thickness, such as a copy sheet, and the number of printed sheets is equal to or less than a set value, the thermoplastic resin film is The master 10 is made using the master base paper 10a which is thin and has a low printing durability. Although this master 10 has low printing durability, since the contact between the master 10 and the printing paper S is weak and the number of times of contact is small, the thermoplastic resin film is not cut or a hole is not formed during printing. It does not occur that the ink is leaked out from the part or the part having the hole and the printing paper S is not stained.
[0056]
When making the master 10 from the master base paper 10a having a thin thermoplastic resin film, it is possible to shorten the master making time of the master 10 by increasing the transport speed of the master base paper 10a at the time of making the master. The efficiency can be improved. In addition, the thermal energy required for plate making of the master 10 is reduced, and the energy cost for making the master 10 can be reduced.
[0057]
The master base paper 10a (or 10b) is held in the master base paper holding section 2a (or 2b), respectively, and the selected master base paper 10a (or 10b) is supplied by the master base paper supply mechanism 17, so according to the printing conditions. The work of attaching and detaching the master base paper 10a (or 10b) becomes unnecessary, and this also increases the work efficiency of the printing work.
[0058]
Further, since the master base paper 10a (or 10b) selected according to the printing conditions is automatically supplied to the plate making unit 3, the master base paper 10a (or 10b) is not supplied erroneously and the master according to the printing conditions is not generated. 10 plate making can be performed reliably.
[0059]
In the present embodiment, the case where two master base paper holding units 2a and 2b are provided and two types of master base papers 10a and 10b are used has been described as an example. However, three or more master base paper holding units are provided. The master base paper corresponding to the printing conditions may be selected from three or more types of master base paper.
[0060]
In the present embodiment, the two types of master base papers 10a and 10b are formed by bonding a thermoplastic resin film and a porous support, and the thickness of the porous support is the same and the thermoplastic resin film Although the example having different thicknesses has been described as an example, master base papers having the same thickness of the thermoplastic resin film and different thicknesses of the porous support may be used. Furthermore, you may use the master base paper which is formed only from a thermoplastic resin film and in which the thickness differs.
[0061]
【The invention's effect】
According to the stencil printing method of the first aspect of the present invention, a master base paper having a high printing durability is selected from at least two types of master base papers held in the vicinity of the plate making section according to printing conditions. By making a plate, it is possible to prevent the master from being worn out due to contact with the printing paper during printing, and to prevent a cut or a hole from being formed. This prevents dirt from getting dirty, which eliminates the need to suspend printing and make the same master again to prevent the master from being cut or perforated due to wear. it can. On the other hand, by selecting master base paper with low printing durability according to the printing conditions and making the master, the master can be made in a short time, so that the work efficiency of the printing work can be improved, and at the time of making the master Energy costs can be reduced because less thermal energy is required. In addition, since at least two types of master base papers having different printing durability are held in the vicinity of the plate making section, it is not necessary to attach and detach the master base paper according to the printing conditions. Efficiency can be improved.
[0062]
According to the stencil printing method of the second aspect of the present invention, a master made of a master base paper having a thick thermoplastic resin film has high printing durability and is not easily worn. Even when there are many cases, it is possible to prevent the thermoplastic resin film from being cut or perforated, and the ink from leaking out from the cut or perforated portions to prevent the printing paper from becoming dirty. In addition, since the thickness of the porous support is large, the master made from the master base paper having a large overall thickness has a higher function as a cushioning material for the porous support, so the printing durability is increased. Even when the printing paper is thick or the number of printed sheets is large, the thermoplastic resin film does not cut or get a hole, and ink leaks from the cut or hole. The printing paper can be prevented from getting dirty. On the other hand, when making a master from a master base paper with a thin thermoplastic resin film, the master can be made in a short time, and the energy cost can be reduced because less thermal energy is required for making the master. . In addition, a master made from a master base paper having a thin porous support and a thin whole reduces the amount of ink that is discarded while remaining in the porous support when the master is discharged, thereby reducing ink waste. be able to.
[0063]
According to the stencil printing apparatus of the third aspect of the present invention, when a master base paper having a high printing durability is selected according to the printing conditions, the master made from the master base paper is the same as the printing paper at the time of printing. This prevents wear and cuts or holes from coming into contact, and prevents ink from leaking out from the cut or perforated areas, resulting in contamination of the printing paper. In order to prevent punching and punching, there is no need to temporarily stop the printing operation and make the same master again, thereby increasing the work efficiency of the printing operation. On the other hand, when the selected master base paper has a low printing durability, the master can be made in a short time, so that the work efficiency of the printing work can be improved, and the thermal energy required for making the master is increased. The energy cost can be lowered to reduce the cost. In addition, since at least two master base paper holders are provided and master base papers having different printing strengths are held in each master base paper holder, there is no need to replace the master base paper according to the printing conditions. From this point as well, the work efficiency of the printing work can be improved. Further, at least one of the conveying speed of the master base paper at the plate making section and the heat energy per unit time applied to the master base paper at the time of plate making is changed by the variable means according to the selected master base paper, thereby making the plate making section Then, appropriate plate making according to the selected master paper is performed, and a good master can be made.
[0064]
According to the stencil printing apparatus of the fourth aspect of the present invention, when the type of printing paper to be used is input by the paper type input means as the printing condition, the master base paper is automatically selected by the master base paper selection means in response to the input. Since the selection is made, the selection of the master base paper to be used is not mistaken, and the master can be surely made according to the type of printing paper to be used.
[0065]
According to the stencil printing apparatus of the fifth aspect of the present invention, when the number of prints is input by the number-of-prints input unit as a printing condition, the master is automatically selected by the master base paper selection unit according to the input, There is no mistake in selecting the master base paper to be used, and master plate making according to the number of printed sheets can be reliably performed.
[Brief description of the drawings]
FIG. 1 is a front view showing a schematic structure of a main part of a stencil printing apparatus according to an embodiment of the present invention.
FIG. 2 is a front view showing a state where a master base paper to be fed to a plate making unit is switched.
FIG. 3 is a front view showing a slide mechanism for sliding a master base paper holding unit.
FIG. 4 is a front view showing a driving mechanism of a calling roller.
FIG. 5 is a block diagram showing a part of a control circuit configuration.
FIG. 6 is a flowchart for explaining processing contents related to master plate making and printing using the master in the stencil printing apparatus.
[Explanation of symbols]
1 plate cylinder
2a, 2b Master base paper holder
3 Plate making part
10 Master
10a, 10b Master base paper
17 Master base paper supply mechanism
46 Paper type input means, paper number input means
S printing paper
Step S2, S4 selection means

Claims (5)

The master base paper is heated and melt-pierced by a plate making section to make a master, the master made by making a master is wound around the outer peripheral surface of a substantially cylindrical plate cylinder, and the printing paper is pressed against the master wound around the plate cylinder. In the stencil printing method in which the ink supplied to the inside of the plate cylinder oozes out from the master and prints on the printing paper,
Holding at least two types of master base papers having different printing durability in the vicinity of the plate making section, selecting any one of the master base sheets according to printing conditions, and supplying the selected master base paper to the plate making section. A stencil printing method characterized in that a master is made. The at least two types of master base paper are formed by laminating a thermoplastic resin film and a porous support, and the thickness of the thermoplastic resin film or the thickness of the entire master base paper is different. Item 2. A stencil printing method according to Item 1. A substantially cylindrical plate cylinder that is driven to rotate about an axis, and a plate making unit that makes a master base plate by heating / melting and punching a master base paper, and printing paper is wound around the master wound around the outer peripheral surface of the plate cylinder In the stencil printing apparatus for printing on the printing paper by causing the ink supplied into the plate cylinder to ooze out from the master by pressing
At least two master base paper holders that hold master base papers having different printing durability selected according to printing conditions;
A master base paper supply mechanism for supplying the selected master base paper to the plate making section;
Variable means for varying at least one of a conveyance speed of the master base paper in the plate making section and thermal energy per unit time applied to the master base paper during plate making according to the master base paper supplied to the plate making section; ,
A stencil printing apparatus comprising: A paper type input means for inputting the type of printing paper to be used as printing conditions;
Master base paper selection means for selecting the master base paper to be supplied to the plate making unit in response to an input from the paper type input means;
The stencil printing apparatus according to claim 3, comprising: A print number input means for inputting the number of prints as a print condition;
Master base paper selecting means for selecting the master base paper to be supplied to the plate making unit in response to an input from the number of printed sheets input means;
5. The stencil printing apparatus according to claim 3, wherein the stencil printing apparatus comprises:

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