JPH04105984A - Multiple screen printing method - Google Patents

Abstract

PURPOSE:To impart a printing image to printing paper while holding predetermined positional relation by applying accurate mechanical feed action to ink undried printed matter immediately after printing. CONSTITUTION:When a press plate 18 is pressed toward a base stand 10 from a state shown by B-1, a new yellow circular image (b) is formed on paper S as shown by B-2. In printing paper on and after the second paper, a screen printing base plate 28' is in such a state that red ink is already bonded to a part a' as a shown by B-2. Therefore, even when the press plate 18 is pressed to the base stand 10 in order to print a yellow image, the contaminated part a' due to red ink is accurately superposed on the image (a) due to the red ink and, therefore, any adverst effect is not exerted on the image (a) due to the red ink.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the technical field of stencil printing, and particularly to a method of forming a multicolor printed image such as a color image by stencil printing.

[Prior Art] It has been a well-known technique for a long time to form a multicolor print image, such as a color image, by overlapping and printing a plurality of print images using inks of different colors on a printing substrate. In this case, it has also been well known for a long time that natural colors can be separated into multiple individual colors such as the three primary colors, and printed images of each of these colors can be superimposed to obtain a printed color (natural color) image. be.

Conventionally, in such multicolor overlapping printing, after a printed image in one color is printed on the substrate, an image in another color is printed on top of that. Until now, it was assumed that the ink of the previously printed image should be dried.

For example, when a subsequent printing is applied, some of the ink forming the printed image on the substrate from the previous printing is transferred to the surface of the plate for the subsequent printing, and Stained by the printing plate or previous printing ink.

In letterpress, intaglio or offset printing, when the ink of the image from the previous printing adheres to the plate of the subsequent printing, as mentioned above,
When the ink supply roller is pushed to replenish ink to the subsequent plate, the part of the ink supply roller that came into contact with it is stained by the ink deposited on it. When the dirty part of the roller subsequently comes into contact with other parts of the cedar board, the dirt is transferred to other parts of the cedar board, and this process is repeated, so that later plates gradually cover other parts of the cedar board rather than the original dirt spot. It also became smudged in many places, so subsequent printing had to be done after the previous printing had dried sufficiently to avoid ink transfer.

Similar to multicolor overlay printing by letterpress, intaglio, or offset printing, multicolor overlay printing can also be performed by stencil printing using a stencil, but in this case as well, subsequent prints are based on images from previous prints. It was thought to be a matter of course that this should be done after the ink had dried. In stencil printing in particular, the ink must pass through small holes drilled in the stencil paper, so in order to ensure its fluidity, there are major restrictions on the quick drying of the ink. With regard to the waiting time required for subsequent printing after waiting for the ink of the printed image to dry, there are restrictions that are significantly disadvantageous compared to letterpress, intaglio, or offset printing.

[Problem to be solved by the invention] As mentioned above, it is possible to capture natural colors by separating them into several color components such as the three primary colors, superimpose individual images of these color components, and print a color image overnight. When,
Although there are differences in length and shortness depending on the drying properties of the ink between printing with each color component, in principle there must always be a waiting time for the ink from the previous printing to dry, and this time is especially important for stencil printing. In this case, there is a problem that the time cannot be shortened to a considerably long time because the conditions conflict with the fluidity of the ink.

The present invention provides that when letterpress, intaglio or offset printing is compared with stencil printing, in the former the side of the plate that contacts the substrate and the side that is supplied with ink are on the same side of the plate. In the latter case, we focused on the fact that the side of the plate in contact with the printed material and the side to which ink is supplied are on opposite sides of the plate, and that the wood quality is different. By making effective use of this feature, the multi-stencil plate completely eliminates the need to wait for the ink of the printed image from the previous printing to dry between successive printings in multicolor overlapping printing. The first task is to provide a printing method.

By the way, regarding the handling of printed matter produced by so-called printing methods that use ink, including stencil printing, the ink has not yet dried and fixed on the printed matter immediately after printing, so the feeding means for conveying the printed matter must not touch the printing screen. If this happens, there is a problem that the printed image will be distorted or the feeding means will be smeared with ink.Therefore, the printed matter immediately after printing must be fed by some kind of accurate mechanical feeding means rather than the feeding effect by its own inertial force or the feeding effect by air flow. It was difficult to provide a feeding effect.

The present invention relates to the first object of providing a multi-stencil printing method without waiting time, and the present invention achieves the first object by applying an accurate mechanical feeding action to undried ink printed matter immediately after printing. The second objective is to provide a multi-stencil printing method that can more effectively achieve the following.

[Means for Solving the Problems] According to the present invention, the first problem is that a plurality of stencil printing originals including first and second stencil printing originals are placed in a predetermined positional relationship with respect to a printing material. The ink of the printed image applied onto the printing substrate by the first stencil printing master is undried or not. This is achieved by a multiple stencil printing method characterized in that a printed image is applied by a stencil printing original plate.

The first and second problems also include a printing drum and a back-pressing roller that cooperates with the printing drum and defines a nipping area in which printing paper is to be printed while being nipped and fed between the printing drum and the printing drum. A plurality of rotary stencil printing devices including first and second rotary stencil printing devices sequentially overprint printed images while maintaining a predetermined positional relationship with respect to the printing paper, and at this time, the first rotary stencil printing device This is achieved by a multiple stencil printing method characterized in that the second rotary stencil printing device applies a feeding action to the printing paper before the feeding action given to the printing paper by the printing device ends.

[Operations and Effects of the Invention] As described above, in stencil printing, the side of the plate that contacts the printed material and the side to which ink is supplied are on opposite sides of the plate, so Even if the sides are smeared with undried ink from a printed image from a previous printing, if the plate is kept in the specified positional relationship with the substrate during each printing, the smudges on the plate will disappear. Therefore, the phenomenon of undried ink from a previous printed image transferring to and staining the plate of a subsequent printing will affect the quality of the printed image no matter how many times the printing is repeated. has no effect on This is in contrast to letterpress, intaglio or offset printing, where stains on one part of the plate are transmitted to other parts of the plate via the ink supply roller.

Therefore, if the condition that each stencil paper on which the individual images to be superimposed and printed are brought into contact with the substrate while maintaining a predetermined positional relationship as described above is clearly recognized and executed, then stencil printing is possible. Multi-color superimposed printing can be carried out one after another quickly without waiting for the ink of the printed image in the previous printing to dry.

Furthermore, when the first and second rotary stencil printing devices overlap print images at predetermined positions on one printing paper as described above, the printing paper is printed by the first rotary stencil printing device. Before the feeding action ends, at least the feeding action of the printing action and the feeding action to be applied to the same printing paper by the second rotary stencil printing device is started. , the feeding action of the paper to the second rotary stencil printing device is such that although the sheet is a printed matter immediately after printing by the first rotary stencil printing device, the paper feeding action of the second rotary stencil printing device The drum and back-pressing roller provide strong mechanical gripping action from both the upper and lower surfaces over the entire width of the printed material, ensuring that the printed image is applied reliably and with high precision, maintaining a predetermined positional relationship to the printing paper. I can do it.

In addition, the feeding of printing paper to the first rotary stencil printing device is as follows:
Since the printing paper does not yet carry any printed image at this time, this can be achieved reliably and with high precision by any conventionally known feeding device in this field of technology.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 of the accompanying drawings is a perspective view of an apparatus illustrating how to carry out the invention using a manual pressure stencil printing apparatus used on a tabletop. In this example, the parts indicated by a, b, and c in C2 of the figure are printed as circular images of three colors, red, yellow, and blue, respectively, and in the overlapping parts of these colors, a combination of the two is printed. A multicolor image representing different colors is formed by the method of the present invention.

The structure of the stencil printing device used here is shown in Figure A-1.
I will explain about it. The suppression type stencil printing device as shown in this figure is based on the Utility Model Publication No. 57, which was filed in an earlier application filed by the same applicant as the present applicant.
It may be of the same type as the one proposed in Japanese Patent No. 15814 and widely used in recent years for printing New Year's cards and the like under the trade name "Print Gokko." However, in this case,
In particular, as will be described later, a device is additionally provided to maintain a constant relative position between the printing material and the stencil.

In the figure, 10 is a base, which is placed on a flat surface such as a desk top. A printing paper holder] 2 is placed on the flat upper surface of the base 10. Although this printing paper holder] 2 is not shown in this figure, it is used in the press-type stencil printing device proposed in Utility Application No. 2-24696 filed by the same applicant as the present applicant. The foundation]
It is more preferable that the base 10 be slidably placed on the base 10 and that its position in two dimensions along the top surface of the base 10 can be finely adjusted by a position adjustment device.

A pair of stays 14 are fixed on the base 10, and a press plate 18 is pivotally attached to these stays by round rods 16. The pressing plate 18 is a plate-shaped member as shown, and is provided with a pair of lugs 20 at a portion that pivotally engages with the stay 14 via the round bar 16.

A pair of arched flexible bearing grooves 22 are provided in the suppression plate 18, and a plate-shaped stencil printing original supporting device 24 is inserted into the flexible bearing grooves 22 by a pair of short shafts 26 provided at both ends thereof. It is attached to the press plate 18 in such a manner that it can rotate somewhat around the central axis of the short shaft 26 in the engaged state.

The stencil printing original supporting device 24 includes a pair of holding fittings 30 for holding the stencil printing original 28, and a stencil printing plate 1 held by these holding fittings. It is provided with four protrusions 32 that prevent the stencil printing original 28 from being positioned relative to the suppression plate 18. The original plate 28 for stencil printing is disclosed in Japanese Utility Model Application Publication No. 51-132007, Utility Model Application No. 117434, and Utility Model Application No. 117434 filed by the same person as the present applicant. 1174
It may be as proposed in No. 35, in which the periphery of a heat-sensitive stencil paper 34 made by laminating a hot-melt resin film and Japanese paper or gauze is supported by an annular frame 36 made of cardboard, Further, an ink-permeable sheet is pasted on one side of the annular frame body opposite to the side supporting the stencil paper 36. Such a stencil printing original plate may be made by perforation by the above-mentioned "Print Gokko", or may be the one proposed in Japanese Patent Application Laid-Open No. 54-33111.7 filed by the same applicant as the present applicant. The holes may be directly perforated by a heat-generating multi-point matrix printhead.

A hook-shaped corner 38 is provided on the printing paper holder] 2 to help position the printing paper S placed thereon at a predetermined position relative to the printing paper holder.

The embodiment shown in FIG. 1 is to obtain a printed image in which the three-color circular images of red, yellow, and blue are partially overlapped and printed in a superimposed manner as described above. In order to facilitate the rapid production of a large number of printed materials, the embodiment shown in FIG. and a two-way stencil printing device indicated by B-1 and B-2 in the figure,
Three-way stencil printers shown as C-1 and (, -2 in the figure) are prepared at the same time. It is assumed that a yellow circular image is printed, and a blue circular image is printed depending on the stencil printing device at the third entrance.

A-1 in FIG. 1 shows the stencil printing in which the stencil printing original plate 28 is perforated at the circular portion shown by 40, and red ink is applied to print a red circular image through the perforation. A state in which the printing paper S is loaded into the apparatus and placed on the printing paper holder 12 with the printing paper S aligned at a predetermined position at the corner 38 is shown.

Starting from this state, when the press plate 18 is pressed together toward the base 10, a circular red print image a is formed on the paper S as shown in A-2 in the figure.

A-2 in the figure shows a state in which printing of this red print image a has been completed and the suppression plate 18 has been returned to its original open position.

Next, the paper S is positioned on the printing paper holder 12 of another stencil printing apparatus of the same type as the stencil printing apparatus shown at A-1 in the figure, using the corner 38 as shown at B-1 in the figure, in the same manner. It is placed in the same condition. In the stencil printing device shown in B-1 of the figure, a stencil printing original plate 28' of the same type as that used in A] of the figure is perforated in the circular part shown by 41, and this perforation allows the yellow It is installed with yellow ink applied to it to print a circular image.

Starting from the state shown in B-1 of the figure, when the pressing plate 18 is pressed toward the base 10, a new yellow circular image b]4 is displayed on the paper S as shown in B-2 of the figure. is formed. B-2 in the figure shows a state in which printing of the yellow circular image is completed and the pressing plate 18 is returned to its original position opened to the base 10. At this time, the red printed image a
Immediately after the yellow printing image A is printed, since the ink in the printing image a has not yet dried, the stencil printing original plate 28' is printed as shown in B-2 in the figure. A red ink stain as shown by a' appears in the area that has come into contact with image a. Therefore, when printing the second and subsequent sheets of paper, in the state at the start of printing the yellow image shown in Figure B-1, the stencil printing original plate 28' is placed in the area a' as shown in Figure B-2. Red ink has already adhered to the surface. However, starting from this state, even if the pressing plate 18 is pressed toward the base]O to print a yellow image, the red ink stained area a' will correctly overlap the red ink image a, so the red ink will image a is not affected in any way.

The paper S on which the red image a and the yellow image have been applied as shown in Figure 13-2 is then transferred to the printing paper holder of another same type of stencil printing device as shown in Figure C-1. ]
2 and positioned in a similar manner by corners 38. This stencil printing device has either a stencil printing original plate 28" of the same type as the stencil printing original plate 28.28', or a 42"
A hole is formed in the circular portion shown by , and the hole is mounted with blue ink supplied to print in blue at this hole.

Starting from this state, when the press plate 18 is pressed against the base 10, a red circular print image a and a yellow circular print image partially overlap on the paper S as shown in C-2 in the figure. In this state, a blue circular print image C is formed.

At this time, if the blue print image C is subsequently printed on the paper with the red and yellow print images obtained in B-2 of the figure before those inks have dried, the printing will be completed. As shown in Figure C-2, on the stencil printing original plate 28'' after the printing, stains with red ink and yellow ink are formed on portions a' and b' corresponding to the red printed image a and the yellow printed image, respectively. Therefore, the state of the stencil printing original plate 28" when printing the blue stamp dramatic image C on the second and subsequent sheets of paper is not the state shown in C-1 of the figure, but the state shown in C-2 of the figure. It's in a state. However, even if the blue print image C is printed on the stencil printing original plate 28' in this state, the stained areas a' and b' caused by the red ink and the blue ink will appear on the red print image a and the yellow print image, respectively. These printed images are not adversely affected in any way as they overlap correctly.

In this way, during stencil printing, if the condition that the stencil is always in contact with the substrate in a predetermined positional relationship is satisfied, individual printed images can be superimposed on the same paper using each of the plurality of stencils. Obtaining multicolored prints by combined printing can be carried out without any period for ink drying between individual printing runs.

The multiple stencil printing method based on the above principle can also be carried out using a rotary stencil printing device that carries out stencil printing by mounting stencil paper around a rotating drum.

The attached FIGS. 2 to 5 are diagrams showing the configuration of a rotary stencil printing apparatus proposed in Japanese Patent Application No. 341020 filed by the same applicant as the present applicant. Here, the main structure of this rotary stencil printing device will be explained to the extent necessary for explaining the present invention, so matters related to the more detailed structure and effects of this rotary stencil printing device will be described above. Please refer to the specifications and drawings of each patent application.

Figures 2, 3 and 4 are from the above patent application No. 1B4102.
FIG. 5 is a side view diagrammatically showing the configuration of the main parts of the rotary stencil printing device according to No. 0 in three different operating states, and FIG. 5 shows the configuration shown in FIGS. 2 to 4. FIG. 2 is a somewhat exploded side view of the printing device including the device, seen from the right side of these figures;

In these figures, 10] is a printing drum, and 102
is the back pressing roller. The printing tram 101 includes annular members 103a and 103b at both ends.
On the circumferential surfaces of these annular members 103a and 103b, there is a mesh material having a rectangular developed shape made of woven, non-woven or knitted wire material, for example, a mesh made of stainless steel wire woven vertically and horizontally. 84 is wound into a cylindrical shape and is freely seated in band-shaped areas along both side edges.

A crossbar 105 is provided in a portion along the generatrix of the printing drum 101, and a crossbar 105 is provided on the crossbar for selectively attaching the leading edge of the stencil sheet to be wound around the printing drum. An edge attachment device 1°5a is provided. The crossbar 105 also functions as a member connecting both the annular members 103a and 103b, but the annular portion HA' 103
a and ]03b are driven in synchronization with each other in the manner described below, so the crosspiece 105 is not required to be very strong. The printing drum 101 has annular shaft portions 106a and 106b protruding from the annular members 103a and 103b at both ends, which are rotatably attached to the frame 108 via bearings 107a and 107b, respectively. It is rotatably supported around its central axis. The back pressing roller 102 is
The shaft parts]09a and 109b protruding from both ends thereof are rotatably mounted on the frame 108 via bearings 110a and 1]Ob, respectively, so that the shaft parts are supported rotatably around their central axis. There is.

The printing drum 101 and the back-pressing roller 102 have ring gears 111a and 112a of the same shape attached to both ends of each.
2 to 4 due to the meshing of 111b and 112b.
As shown by arrows in the figure, they rotate in opposite directions synchronously and at the same speed, and this rotation is driven by a drive device 113 that includes an electric motor inside the support roller 109b of the back-pressing roller 102. It is done by being given. Since the backing roller 102 may have a rigid structure, the crosspiece 105 does not need to be as rigid as the annular member], and the twist-free synchronous alignment between 03a and 103b is in this case the backing roller 102. achieved through. The backing roller 102 has a groove 1 corresponding to the crosspiece 05 of the printing drum 101 and capable of receiving it.
14 is formed.

In FIGS. 2 to 5, the distance between the printing drum 101 and the circumferential surface of the backing roller 102 or the printing drum 101
Although the increment of the center-to-center distance between the two and the diameter of the back-pressing roller 102 is shown to be exaggerated relative to their diameter for illustration purposes, the distance between the circumferential surfaces or the center-to-center distance is The increment to the diameter is approximately 2 to 5 mm even in an actual device where the diameter of the printing drum is more than ten centimeters (it may be as small as possible. This is a sandwiching area 115 that pinches the sheet S. Note that 116 and 117 are feed rollers for feeding the paper S toward the sandwiching area 115.

Inside the printing drum 10, a back-pressing roller is selectively attached to a part along the generatrix of the cylindrical portion substantially made only of the net material 104 and facing the back-pressing roller 102.
An intermediate push roller 118 is provided to bulge outward in the radial direction toward 02. This intermediate push roller is rotatably supported by a shaft 119 that extends in alignment with its central axis, and the shaft 119 is connected to arms 12]a and 121 . by shafts 120 at both ends thereof. Supported via b2
] There is. The shaft 120 extends through the annular shaft portions 106a and 106b at both ends of the printing drum 101, and is movably supported by the frame 108 at both ends via bearings 122a and 122b. has been done. One end of the shaft 120 is connected to the drive device 11 via a lever 123 and a link 124.
3, which detects when the stencil paper is mounted around the printing drum 10 in a predetermined manner and the printing paper is supplied to the sandwiching area 115 in a predetermined manner. is driven in response to the output of an appropriate sensor (not shown), and the intermediate push roller 118 moves the portion of the cylindrical body made of net material along one generatrix facing the back push roller in a radial direction toward the back push roller. It is designed to bulge outward. FIGS. 3 and 4 show a state in which a portion of the cylindrical body made of net material is pushed out by the intermediate push roller 118 toward the back push roller. In FIG. 3, the crosspiece 105 is exactly in the position where it fits into the groove 114 of the back-pressing roller, and the front end is attached to the crosspiece 105 and wrapped around the printing drum 01 (
=1 shows the state immediately before the digitized stencil paper T starts to come into contact with the printing paper S.

The leading edge of the stencil and the trailing edge of the stencil adjacent to this leading edge after going around the drum are usually not perforated, so when these areas are facing the intermediate push roller, the screen Even if the cylindrical body made of material is pressed from the inside thereof toward the back-pressing roller by an intermediate pressing roller containing ink, the back-pressing roller will not be contaminated by the ink. In addition, there is a crosspiece 105 at the joint between the leading edge and the trailing edge of the stencil sheet, and the back-pressing roller is further spaced from the crosspiece by a groove 114, so that the cylindrical body made of net material is shown in FIG. Even if the intermediate push roller 118 bulges radially outward toward the back side of the crosspiece in the state shown, the back push roller will not be contaminated with ink.

Although not shown in the figure, the ink is supplied into the printing drum in the same manner as in a conventional rotary stencil printing device, and is then supplied in a layered manner onto the surface of the intermediate press roller 118. The material is transferred from the outer circumferential surface of the material to the inner circumferential surface of the cylindrical body, from which it is applied to the inner surface of the stencil paper. Therefore, the intermediate push roller 1]8 operates as a roller that pushes out a part of the cylindrical surface made of the net material of the printing tram toward the back push roller, and at the same time, it also operates as an ink supply roller. Therefore, in early manual mimeograph machines that had a square frame covered with a net, the intermediate press roller had the function of pressing the stencil paper against the printing surface and at the same time supplying ink. It functions similarly to a hand roller.

FIG. 6 shows the structure of the rotary stencil printing apparatus as shown in FIGS. 2 to 5 as one unit, in order to carry out the multiple stencil printing method according to the present invention using a rotary stencil printing apparatus, and three of them are shown. FIG. 4 is a diagram illustrating a rotary stencil printing device combined into one rotary stencil printing device in the same manner as in FIGS. 2 to 4; As shown in this figure, the three units are printing paper S
are arranged close to each other along the feeding direction of the sheet S, and the operation phase of the next unit U2 is approximately 1 with respect to the unit U1 which is the most second-stream side when viewed along the feeding direction of the sheet S.
The operating phase of unit U3, which is further downstream, is delayed by 20 degrees, and its operating phase is approximately 1.20 degrees relative to unit U2.
It's been delayed. Of course, these three units are operated in synchronization with a predetermined phase difference.

In this rotary stencil printing device, a first image formed by unit l-ul is printed on paper S by ink of a first color forming unit l-ul.
Then, in unit U2, a second image formed by superimposing the image printed in unit U is printed with ink of a second color, and further in unit U3, ink of unit U1 and U2 is printed. printing a third image superimposed on the two printed images using ink of a third color, at which time the units U1, U2, and U3 are operated while always maintaining a predetermined phase difference between them; The relative positional relationship between the paper S fed through these units and the units U1, U2, and U3 is always kept in a predetermined relationship.

Therefore, in this rotary stencil printing apparatus, printing is performed in unit U2 without waiting for the ink of the printed image in unit U to dry, based on the same principle as explained with reference to FIG. unit U3 without waiting for the ink of the image printed in units U1 and U2 to dry.
Even if printing is carried out at the same time, it is possible to obtain the desired printed matter without any stains.

In FIG. 6, reference numerals 125 and 126 are guide devices that support and guide the sheet S from below, and these may be in contact with the entire back surface of the sheet S. Reference numerals 127 and 128 are guide devices that touch the top surface of the paper S and guide it. It is configured to contact the paper only in a limited area along the edge.

The sheet S is first fed by rollers 116 and 17 that operate in synchronization with the operation of unit U1 so as to maintain a predetermined relative positional relationship with unit U;
The relative position of the sheet S with respect to the unit U2 is determined by the feeding action applied to the sheet S by the unit U], and the relative position of the sheet S with respect to the unit U3 is then determined by the sheet S being fed by the unit U2.

That is, as printing progresses on the paper S by the unit U in the illustrated state, the paper S is held between the printing drum [O] and the backing roller [02] in the unit U], so that the paper S is printed as shown in the figure. The paper S
The leading end of the printing drum 10 is held between the printing drum 10 of the unit 1-U2 and the backing roller 102. When the printing on the paper S further progresses and the paper S moves from the unit U2 to the unit U3, a similar continuous succession of the feeding action is performed.

FIG. 7 is a diagram similar to FIG. 6 showing another embodiment in which the multiple stencil printing method according to the present invention as described above is carried out by a rotary stencil printing apparatus. In this embodiment, a single common backing roller 102 is used for three printing drums 101 that perform overlapping printing on printing paper S in sequence according to the method of the invention. In this case, after the paper S is printed by the first printing drum, the paper S is held in the cylindrical shape of the backing roller 102 until its leading end is gripped between the third printing drum and the backing roller 102. Since it must advance in a curved manner along the surface, the back pressing roller 102
A suction nozzle 130 is provided on a part of its cylindrical surface and is arranged continuously or dividedly in the direction along one generatrix, and the suction nozzle 130 is guided by a suction pump (not shown in the figure). Negative pressure is introduced to hold the leading edge of the sheet S on the cylindrical surface of the backing roller.

The leading edge of the paper S is held by the suction nozzle 130.
It is sufficient to simply perform a suction action to hold the leading edge of the paper S on the back-pressing roller, and in this embodiment, positioning and feeding of the paper for printing by the second printing drum is performed by the first printing drum. The feeding between the second printing drum and the back-pressing roller ensures that the paper is positioned and fed for printing by the second printing drum. This is done reliably by sandwiching the feed.

Note that the action of the suction nozzle 130 is simply to lightly hold the leading end of the sheet S on the back-pressing roller as described above, and an appropriate claw device may be used instead of such a suction nozzle.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a stencil printing device showing one embodiment of the multi-stencil printing method according to the present invention using a suppression type stencil printing device, and Figs. A side view diagrammatically showing the configuration of the main parts of one rotary stencil printing device in three different operating states, FIG. 5 is a printing machine including the configuration shown in FIGS. 2 to 4. FIG. 6 is a somewhat exploded side view of the apparatus seen from the right side of these figures, and FIG. 6 shows the rotary stencil printing apparatus shown in FIGS. A diagram showing the configuration of a rotary stencil printing apparatus for carrying out a multiple stencil printing method in the same manner as in FIGS. 2 to 4, and FIG. FIG. 7 is a diagram showing another procedure carried out by placing bags in the same manner as in FIG. 6; 10-M stand, 12... Print paper holder, 14... Stay, 16... Round bar, 18... Press plate, 20... Lug, 22... Flexible bearing groove, 24 ... Original supporting device for stencil printing, 26... Short shaft, 28... Original plate for stencil printing, 30... Holding metal fitting, 32... Protrusion, 34... Heat-sensitive stencil paper 36... Annular frame Body, 38...Corner, 40.
41.42...Perforation part, 101...Printing drum, 10
2. Back pressing rollers, 103a, 103b
-... Annular member, 104... Net, ]05... Crosspiece, 1
．． 05a... Equipment for attaching the front edge of the stencil paper, 106
a, 1.06 b... annular shaft portion, 107a, 10
7b,...Bearing, 1-08--Frame, 109a, 10
9b,,,shaft, 1.10a, 110b
−・・Bearing. 111 a, 11 l b, 1.12 a,
112 b...ring gear, 113... drive device,
114... Groove, 115... Sandwiching area, 116.117...
・Roller, 118...Medium push roller, 119.120
...Axis, 121a, 12 l b-・Arm, 1
22 a, 122 b-bearing,] 23... lever,
124...Link, U25.126, 27,...Guiding device] 0...Suction nozzle license application Riso Kagaku Kogyo Co., Ltd.

Claims (2)

[Claims] (1) A plurality of stencil printing masters including first and second stencil printing masters are sequentially brought into contact with the substrate while maintaining a predetermined positional relationship, and the first stencil printing master is used to cause the printing material to be printed. A multiple stencil printing method characterized in that a printed image is applied onto the substrate by the second stencil printing original plate regardless of whether the ink of the printed image applied thereon is undried or not. (2) first and second rotary stencils having a printing drum and a backing roller that cooperates with the printing drum to define a nipping area in which printing paper is to be printed while being nipped and fed between the two; A plurality of rotary stencil printing devices including a printing device sequentially overprint printing images while maintaining a predetermined positional relationship with respect to the printing paper, and at this time, images are applied to the printing paper by the first rotary stencil printing device. A multiple stencil printing method characterized in that a feeding action is applied to the printing paper by the second rotary stencil printing device before the feeding action ends.