JPH0825782A - Rotary stencil printer - Google Patents

Abstract

PURPOSE:To largely variably control an ink supply quantity with a simple structure and to reduce the occurrence of spoilage and strike-through. CONSTITUTION:Ink supply means 42 is provided in a plate cylinder 1, and ink K is charged in the means 42. When predetermined pneumatic pressure is applied by pressurizing means, ink of the corresponding quantity is supplied to the cylinder 1 side, and can be largely varied. The transfer quantity of the ink to a stencil raw sheet and a print sheet on the cylinder 1 can be regulated by regulating the pressure. A suction unit 45 is provided at the side of the means 42 to once suck the ink K transferred to a print sheet to reduce the height of the placed ink K thereby to print with the ink K of necessary minimum limit, thereby preventing a strike-through.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary stencil printing apparatus for printing on printing paper by rotationally driving a plate cylinder on which a stencil sheet is mounted.

[0002]

2. Description of the Related Art A rotary stencil printing machine is provided with a cylindrical plate cylinder which is driven to rotate by mounting a stencil paper on an outer peripheral surface, and ink supplied to the inside of the plate cylinder is stencil on the outer peripheral surface of the plate cylinder. It supplies it to and prints it one after another.

Therefore, the stencil printing machine 80 shown in FIG.
The press means 84 for pressing the printing paper 50 against the plate cylinder 81 around which the stencil sheet 3 is wound, and
A sheet feeding unit 89 for supplying the printing sheets 50 one by one and a sheet discharging unit 90 for separating the printing sheets 50 printed by the pressing unit 84 from the plate cylinder 81 and ejecting the sheets are provided.

The press means 84 is constituted by a press roller facing the plate cylinder 81 and biased toward the plate cylinder 81 to press the printing paper 50 toward the plate cylinder 81.
The pair of registration rollers is provided on one side of the lower portion and holds the printing paper 50 and sends the printing paper 50 to the plate cylinder 81 side at a predetermined timing. The paper discharging means 90 faces the paper feeding means 89 with a pressing means 84 interposed therebetween. The separation claw is provided on the side where the printing drum 50 contacts the plate cylinder 81 and separates the printing paper 50 from the plate cylinder 81.

As described above, in the stencil printing apparatus, as a method of moving the ink from the inside of the plate cylinder 1 to the printing paper 50, in addition to the method of utilizing the mechanical pushing force of the squeegee roller facing the press roller, the centrifugal force is used. Is used, and recently, a method using a squeegee, which is excellent in image quality, is widely used.

In order to adjust or control the transfer amount of the ink to the printing paper 50 by this squeegee method, the viscosity of the ink is changed, the opening of the image portion of the base paper is changed,
Printing paper 50 that changes the pressure between the squeegee and the press
There is a method of changing the contact time between the stencil sheet 3 and the stencil sheet 3, and the adjustment is performed individually or in combination.

[0007]

However, in the device using the above squeegee, a complicated mechanism is required inside the plate cylinder 1, and the range in which the ink supply amount can be varied is narrow.
It was a cause of scrap paper and set-off.

Further, even if the control means for controlling the ink transfer amount is provided as described above, it is impossible to control the optimum transfer which is substantially required only by changing the ink supply amount. Therefore, increasing the ink supply amount causes set-off, and decreasing the ink supply amount causes the grain of Japanese paper to appear and deteriorate the printing quality.

More specifically, as shown in FIG. 16 (a), the mechanism of stencil printing starts from the perforated portion 3e which is opened corresponding to the image on the stencil sheet 3 in a state where the printing paper 50 and the stencil sheet 3 are in close contact with each other. The ink K adheres and transfers to the printing paper 50 due to its viscosity. Next, as shown in FIG. 16B, when the printing paper 50 is peeled off from the stencil sheet 3, the ink K is separated into the printing paper 50 side and the plate cylinder 1 side. At this time, ink K
An excessive amount of ink K is supplied to the printing paper 50 side due to its own viscosity and centrifugal force, etc., and microscopically, even one point is in a state in which the ink K is piled up in a small mountain shape. The ink K supplied more than necessary causes set-off when the papers are stacked after printing.

The present invention has been made to solve the above problems, and provides a rotary stencil printing apparatus capable of greatly varying the ink supply amount with a simple structure and reducing the occurrence of waste paper and set-off. It is intended to be provided.

[0011]

In order to achieve the above object, in the rotary stencil printing machine of the present invention, the stencil sheet 3 is wound around the outer peripheral surfaces of the plate cylinders 1 and 71, and the ink K is fed from the inside of the plate cylinder. In the rotary stencil printing device for supplying, according to claim 1, at least a part of the ink K inside the plate cylinders 1, 71 is pneumatically utilized at a portion where the printing paper 50 and the stencil base paper 3 are in close contact with each other. It is characterized by having a means for pressurizing.

In the second aspect, the endless belts 47 and 74 are used as a pressing means for pressing the printing paper 50 against the plate cylinder around which the stencil sheet is wound.

Further, in claim 3, the ink K is applied to the plate cylinder 1,
After passing through the stencil sheet 3 from inside the stencil sheet 71 and transferring the ink K to the printing sheet 50, a part of the inside of the plate cylinders 1, 71 at a portion where the printing sheet 50 and the stencil sheet 3 are in close contact with each other. Is configured to have a means for making a negative pressure.

[0014]

When the rotary stencil printing apparatus of FIG. 5 is taken as an example, the ink K is sent to the ink supply means 42 in the plate cylinder 1, and the ink K for the plate cylinder 1 is corresponding to the air pressure by the pressurizing means.
Directly control the supply of. The printing paper 50 is the endless belt 4
After being printed on a portion of the printing drum 1 that is in contact with the plate cylinder 1 while being conveyed on the sheet 7, the sheet is discharged from the endless belt 47. Immediately after printing, the suction unit 45 in the plate cylinder 1 temporarily sucks the ink K transferred to the printing paper 50 side, so that an excessive amount of the ink K is prevented from remaining on the printing paper 50 and the set-off is performed. To prevent. Then, as in the stencil printing apparatus of FIG. 6, the ink K is pressurized and depressurized by the pressurizing and depressurizing means, and then the ink K is depressurized so that an excessive amount of the ink K remains on the printing paper 50. Can be prevented and set-off can be prevented.

[0015]

1 is a perspective view showing a rotary stencil printing machine of the present invention, and FIG. 2 is a side sectional view of the same. The cylindrical plate cylinder 1
A screen 40 having a large number of holes on the outer periphery is provided,
Inside the plate cylinder 1, two squeegee plates 43 and 44 fixed to the apparatus and contacting the inner peripheral surface 1a of the plate cylinder 1 and a suction portion 45 are provided. The two squeegee plates 43 and 44 form a double squeegee.

The squeegee plates 43, 44 are formed in a plate shape having a length corresponding to the width of the opening of the plate cylinder 1 (depth direction in the figure).
The ink K, which is respectively in contact with the inner peripheral surface 1a of the plate cylinder 1, is squeegeeed by the ink supply means (not shown), and the ink K is pushed out from the hole of the plate cylinder 1 to the outer peripheral surface 1b of the plate cylinder 1. Similarly, a suction portion 45 having a length corresponding to the width of the plate cylinder 1 is provided on the downstream side of the squeegee plates 43 and 44. The suction portion 45 is negatively applied to suck the ink.

Below the plate cylinder 1, there is provided a conveyor belt 47 having a width corresponding to the width of the plate cylinder 1 and extending over both sides of the plate cylinder 1 by a predetermined length. There is. The conveyor belt 47 is formed in an endless shape, and both ends thereof are axially supported by the rotating rollers 48a and 48b.
Has a predetermined area in contact with the outer peripheral portion 1b of the plate cylinder 1 by a predetermined tension. One rotating roller 48a rotates the conveyor belt 47 in the direction a in the figure in synchronization with the rotation of the plate cylinder 1 by a driving unit (not shown). The peripheral speed of the belt surface during conveyance of the conveyor belt 47 is the same as the peripheral speed during rotation of the plate cylinder 1.

A vent hole 47a is formed in a part of the center of the conveyor belt 47, and a mesh vent member is provided in the vent hole 47a. The ventilation hole 47 a is moved by the transportation of the transportation belt 47.
A suction part 49 as a suction means shown in FIG. 2 is provided on the lower surface of the air vent 47a on the moving position. The suction unit 49 sucks the printing paper 50 on the upper surface of the conveyor belt 47 to the conveyor belt 47 via the ventilation holes 47a as described later.

A sheet feeding section 55 is provided on the front side of the conveying belt 47 in the conveying direction. The paper feeding unit 55 includes a paper feeding cassette 56 on which the printing paper 50 is stacked.
An opening 56a is formed on the lower surface of the front end of the printing paper 50 so that the lowermost surface of the printing paper 50 is exposed. The printing paper 50 is urged from above by the urging means 57 in the direction of the opening 56 a and comes into contact with the surface of the conveyor belt 47.

The printing operation of the rotary stencil printing machine having the above structure will be described. When the plate cylinder 1 is rotationally driven in the A direction after the stencil sheet 3 is plated, the conveyor belt 47 is simultaneously conveyed and driven in the a direction. When the ventilation hole 47a reaches the opening portion 56a of the paper feeding cassette 56 (the state shown in FIG. 1), the lowermost printing paper 50 is sucked by the suction portion 49 through the ventilation hole 47a and is conveyed to the conveyor belt 47. The printing sheet 50 is temporarily attached to the upper surface, and one sheet of printing paper 50 is conveyed on the upper surface of the conveyor belt 47 in the same direction a.

The conveyed printing paper 50 is subjected to stencil printing between the plate cylinder 1 and the conveyor belt 47 by the rotation of the plate cylinder 1. In this printing, the inks of the two squeegee plates 43 and 44 are squeegeeed from the inner peripheral surface 1a of the plate cylinder 1 to the outer peripheral surface 1b side through the screen 40, and inks corresponding to the stencil image formed on the stencil base paper 3 are printed. Is applied and performed.

Immediately after printing, the ink K once placed on the printing paper 50, as shown in FIG. 17A, is immediately sucked by the suction unit 45 in a direction away from the printing paper 50 by a predetermined amount. The excess amount of ink is returned to the inside of the plate cylinder 1, and the amount of ink attached to the printing paper 50 is reduced. It should be noted that once the ink K is placed on the printing paper 50, the ink K in the mounted area is not entirely sucked and returned due to the viscosity of the ink, and the ink that has been excessively projected in the height direction on the surface of the printing paper 50. Part of K is returned to the suction unit 45, and as shown in FIG. 17B, the height on which the ink K is placed can be lowered, and the print quality can be improved and set-off can be prevented.

Immediately after this printing, the printing paper 50 is temporarily attached to the surface of the conveyor belt 47 by the suction portion 49 via the ventilation hole 47a again. Therefore, the printing paper 50 does not adhere to the plate cylinder 1 and is ejected. Is conveyed in the direction. In this way, the printing paper 50 is configured to be continuously sucked toward the endless belt 47 side between the upper surfaces between the both ends where the endless belt 47 is folded back, so that the suction starts at one end. The paper is then fed and discharged at the other end to remove the suction.

As another example of the configuration of the rotary stencil printing machine, as shown in the side view of FIG. 3, a pressure roller 58 may be provided at a portion of the printing portion facing the plate cylinder 1. The pressure roller 58 is provided on the lower surface of the conveyor belt 47, and urges the conveyor belt 47 toward the plate cylinder 1 together with the suction unit 49 by a moving mechanism (not shown) during printing.

The pressure roller 58 is used by the plate cylinder 1 as shown in FIG. 4 when the stencil sheet 3 is placed and discharged as described above.
It is configured so as to be retracted in a direction away from, so as not to hinder the rotation of the plate cylinder 1 associated with these landing and discharging plates.

Further, as shown in FIG. 4, a holding means 60 for stacking and holding the printing paper 50 is provided as another paper feeding mechanism,
The pick-up roller 61 provided at the end of the uppermost surface of the print paper 50 may be configured to pass the print paper 50 one by one to the transport belt 47. In this case, the printing paper 50 is stacked on the elevating plate 62, and the uppermost surface of the printing paper 50 on the elevating plate 62 is always in contact with the pickup roller 61 by a moving mechanism (not shown).

Next, FIG. 5 shows a modification of the rotary stencil printing machine. This rotary stencil printing machine is provided with an ink supply means 42 as shown in place of the positions of the squeegee plates 43 and 44 constituting the double squeegee. The ink supply unit 42 has an ink K, one surface of which is in contact with the inner peripheral surface 1a of the plate cylinder 1.
And a pressurizing means for pressurizing the internal ink K by aerodynamic force is provided from the other surface.

Therefore, the ink supply means 42 can supply a predetermined amount of ink K in the direction of the inner peripheral surface 1a of the plate cylinder 1 by the air pressure of the pressurizing means to print on the printing paper 50. Further, since the pressurizing amount of the ink K itself filled in the ink supply means 42 can be adjusted, it is possible to prevent the ink K from being supplied more than necessary, and to supply a large amount of the ink K when necessary. become able to.

Even when this ink supply means 42 is used, the ink K once transferred to the printing paper 50 side can be returned to the plate cylinder 1 side again by the suction portion 45 provided on the side portion to improve the quality. it can.

Next, FIG. 6 is a side sectional view showing another embodiment of the rotary stencil printing machine of the present invention. In this rotary stencil printing device 70, a plate cylinder 71 is rotatable in the direction A in the figure, and the plate cylinder 71 itself is a container for filling the ink K, and the ink K is filled inside. A screen 72 for passing the ink K is formed on substantially the outer periphery of the plate cylinder 71.
It is provided between the centers inside the plate cylinder 71 and is filled in a flexible partition film 73.

The ink K inside the partition film 73 pushes the ink K toward the screen 72 side when the internal pressure is increased by a pressurizing / depressurizing means (not shown), or when the pressure is reduced, the ink K is directed inward from the outside of the screen 72. Ink the ink K.

An endless belt 74, as shown in the figure, can be in surface contact with at least the length of the screen 72 or more in the half of the plate cylinder 71. The endless belt 74 is folded back at two upper and lower positions by the rotating rollers 75a and 75b, and the tension roller 75c is pulled in the F direction in the figure, so that the endless belt 74 has a surface contacting the plate cylinder 71. It is designed to be pressed in the direction. The endless belt 74 includes rotating rollers 75a and 75b connected to a driving source (not shown).
When the plate cylinder rotates, it is conveyed and driven in the same direction as the rotation direction of the plate cylinder 71 (direction A in the drawing). The stencil sheet 3 (not shown) is fixed to the plate cylinder 71 by a plate-mounting mechanism provided at the end of the screen 72 and at the tip in the rotational direction.

The printing operation will be described. When the plate cylinder 71 rotates in the A direction, the printing paper 50 is carried in from the upper position of the plate cylinder 71 in accordance with the surface of the screen 72. After that, when the screen 72 is located in the right half portion as shown in the figure, the entire surface of the screen 72 faces the endless belt 74, and at the same time, the screen 72 and the endless belt 7
The printing paper 50 is positioned between the four. In this state, the plate cylinder 71 is temporarily stopped.

After that, the tension roller 75c is moved to F in the figure.
When pulled in the direction, the endless belt 74 is urged toward the plate cylinder 71, and the printing paper 50 contacts the stencil sheet 3 on the screen 72. At the same time, the ink K is pressurized from the inside of the plate cylinder 71 with a predetermined pressure by the pressurizing and depressurizing means, and the ink K is transferred onto the printing paper 50 corresponding to the image of the stencil sheet 3 on the screen 72. At this time, the ink K is simultaneously transferred onto the printing paper 50 on the entire surface of the stencil sheet 3 at once.

Thereafter, the pressurizing / depressurizing means depressurizes the ink K once placed on the printing paper 50 into the plate cylinder 71, and the excess ink K is recovered in the same manner as described above.
The height of the sheet can be reduced, and the set-off can be prevented to improve the print quality.

After that, when the tension roller 75c returns in the direction opposite to the F direction, the endless belt 7 with respect to the plate cylinder 71.
The surface contact of No. 4 is released. After that, the plate cylinder 71 rotates in the A direction, so that the printing paper 50 moves in the same direction as the plate cylinder 7.
1 is discharged from the bottom.

According to the stencil printing apparatus 70 described above, the plate cylinder 7
When 1 is in a stopped state, the endless belt 74 makes surface contact with the plate cylinder 71, and an image corresponding to the stencil sheet 3 is printed.
Since it is configured to print on 0, it is possible to prevent the blurring and unevenness of the printing due to the rotation as compared with the rotation type, and it is possible to finish the printing quality with uniform density on the printing surface.

At the same time, the pressure of the ink K is adjusted directly by the pressure increasing / decreasing means without squeegeeing.
An excessive amount of ink K is not transferred to the printing paper 50. That is, since the supply of the ink K can be freely controlled by the pressure increasing / decreasing means, it is possible to supply a large amount of waste paper at the initial stage of printing, and to change the pressure according to the temperature viscosity at the time of printing. As a result, the transfer amount of the ink K can be optimized, and thus, the set-off can be reduced.

Next, FIG. 7 is a partially enlarged view showing a plate-pressing mechanism applied to each rotary stencil printing machine. A needle-shaped portion 2 having a predetermined length and width is provided on a part of the outer periphery of the plate cylinder 1. The needle-shaped portion 2 is formed by implanting a large number of needles 5 as shown. The needle 5 is fixed on the plate cylinder 1 in a state of being implanted on the substrate 5a at the bottom. Alternatively, the needle 5 may be directly implanted on the plate cylinder 1 without providing the substrate 5a.

The needle 5 is erected at a predetermined height corresponding to the maximum thickness of the stencil sheet 3 to be plated. For example,
The thickness of the stencil sheet 3 is 40 μm (for Japanese paper) to 80 μm
(For gauze), the needle 5 has a height of 0.1 mm to
The diameter is set in a range of 0.2 mm to 0.4 mm in a range of 1.3 mm. General stencil paper 3 is 40 μm
The thickness of the needle 5 is 0.8 mm and the thickness is 0.3 m.
It is desirable to set m. In any case, the needle 5 is set to a height higher than the thickness of the stencil sheet 3. The needle 5 may have a flat tip as shown, or may be formed into a sharp needle.

The plate cylinder 1 rotates in the direction A in the drawing during printing.
Therefore, as shown in the partially enlarged plan view of FIG. 8, the needles 5 are densely planted near the beginning (the front end portion of the stencil sheet 3) in the rotation direction A, and gradually become sparse as the rear end. Set up. Further, the needle 5 is arranged in the lateral direction (width direction of the plate cylinder 1) in the figure.
Are planted linearly at a constant pitch P, and the next rear row in the rotation direction is planted at a pitch that is an intermediate position between the pitches of the needles 5 at the front stage. In addition, the pitch P is gradually increased according to the subsequent stage in the rotation direction (P1 ← P
3). In addition, as shown in FIG. 9, the needles 5 may be randomly arranged on the substrate 5a instead of the dense and dense state.

Pushing means 10 is provided on the side of the plate cylinder 1. The pushing means 10 has a pushing roller 11 which is rotatably supported. This pushing roller 11
Is an elastic body such as rubber. The pushing roller 11 is moved in the width direction of the plate cylinder 1 by the moving mechanism (not shown) (direction B in the drawing).
The plate cylinder 1 can be moved horizontally to the plate cylinder 1 only during the plate-setting operation described later.
It moves on the upper needle-shaped portion 2, and otherwise retracts from the plate cylinder 1. When the pushing roller 11 moves onto the plate cylinder 1, the pushing roller 11 comes into contact with the needle-shaped portion 2 on the plate cylinder 1 with a predetermined pressure due to an elastic force.

Next, the plate-forming operation with the above configuration will be described. The stencil sheet 3 made by the plate making mechanism is moved from the direction shown in FIG. 7, and the front end portion 3a is located on the plate mounting apparatus 2 (1 in the figure).
It is moved to the dotted line). The front end 3a of this stencil sheet 3
Moves the needle-shaped portion 2 to a position slightly passing through. At this time, the plate cylinder 1 is rotated and positioned so that the needle-shaped part 2 is located on the moving direction of the stencil sheet 3 (for example, the uppermost part of the plate cylinder 1).

After that, the pushing roller 11 starts to move in the width direction of the plate cylinder 1 (direction B in the drawing). The pushing roller 11 contacts the needle 5 with a predetermined pressure, but the pushing roller 1
Since 1 is made of an elastic material, it moves on the needle-shaped portion 2 while it is embedded in the needle 5. During this movement in the B direction, the push-in roller 11 moves while rotating in the C direction in the figure. Then, as shown in the partially enlarged side view of FIG. 10, the stencil sheet 3 located on the needle-shaped portion 2 is moved by the pushing force of the pushing roller 11 to the respective needles 5.
Of the stencil sheet 2 is moved through the needle-shaped portion 2 to the end portion, so that one end of the stencil sheet 3 has only a small width and length. You can stop.

Thereafter, as shown in FIG. 7, the plate cylinder 1 rotates in the direction A, and at the same time, the printing paper is fed and printing is performed. The stencil sheet 3 has the front end portion 3 in the rotation direction A.
Since a is locked by the plurality of needles 5 of the needle-shaped portion 2, it does not fall off when the plate cylinder 1 rotates. When the plate cylinder 1 rotates, the stencil sheet 3 is applied to the needle-shaped part 2 in a state where the front end portion 3a is dense and the stencil sheet 3 is sparse in the rear end direction.
When the stencil sheet 3 is not attached to the rotation of, for example, even when tension acts between the plate cylinder 1 and the stencil sheet 3 at the time of starting the rotation of the plate cylinder 1, It won't tear. That is, the stencil sheet 3 is perforated by a large number of needles 5, and friction between the holes and the needles 5 prevents the needles 5 from coming off in the implantation direction. Further, in the rotation direction of the plate cylinder 1, that is, in the direction orthogonal to the needles 5, the force is dispersed by the plurality of needles 5, and the stencil sheet 3 is fixed in the rotation direction of the plate cylinder 1 without being torn. Will be.

This also applies to the case where the needles 5 are randomly implanted, and if the force is dispersed without applying a large force to only a part of the stencil sheet 3,
It is based on the fact that tearing of the stencil sheet 3 can be prevented.
At the time of printing, the state in which the stencil sheet 3 is attached to the plate cylinder 1 is maintained by the adhesive force of the ink coming out from the inside of the plate cylinder 1.

When the stencil sheet 3 mounted on the plate cylinder 1 is peeled off from the plate cylinder 1 by the plate mounting apparatus described above, the plate discharge mechanism 86 having the plate discharge claw 85 shown in FIG. It may be peeled off from the front end portion 3a. Therefore, the front end 3a of the stencil sheet 3 has a predetermined width, and the front end 3a is engaged with the plate ejection claw 85 to eject the sheet.

FIG. 11 is a diagram showing another plate separating means 20. The plate separating means 20 is configured by providing a plate-shaped plate discharge plate 21 that covers the needle-shaped portion 2 in advance on the needle-shaped portion 2. The plate discharging plate 21 has a plurality of insertion holes 21 a formed corresponding to the positions of the needles 5. Therefore, the stencil sheet 3 is positioned on the plate 21 for plate discharge at the time of printing, and at the time of plate discharge, the plate 21 for plate discharge is moved upward as shown in the figure, so that the front end portion 3a of the stencil sheet 3 is simultaneously moved.
Can be removed from the needle 5 portion of the needle portion 2.

FIG. 12 is a perspective view showing still another plate discharging mechanism 25. This plate discharge mechanism 25 is arranged in place of the plate discharge mechanism 86 shown in FIG.
6, a housing means 28, and an adhesive means 29. Means of transportation 2
The movable roller 26a as 6 is rotatable around the support shaft 26b. The support shaft 26a comes into contact with the outer periphery of the plate cylinder 1 (moves in the direction D in the drawing) by moving means (not shown) about the winding shaft 28, and comes into contact with the rear end portion 3b of the stencil sheet 3.
The accommodating means 28 has a winding shaft 28a and is rotationally driven in the E direction in the drawing by a driving means (not shown), and one end of the adhesive tape 29 is connected to the approximate center position of the shaft in advance.

The adhesive tape as the adhesive means 29 is wound with a predetermined width and length, and the winding portion 29a is rotatably supported around a shaft 29b. One surface of the adhesive tape 29 is an adhesive surface 29c coated with an adhesive material. As the adhesive agent of the adhesive tape 29, one having an adhesive force larger than the adhesive force between the plate cylinder 1 and the stencil sheet 3 is used. This adhesive tape 29 has a winding portion 29a as shown in the drawing.
Is extended in the direction of the movable roller 26a, is folded back at the movable roller 26a portion, and is wound around the winding shaft 28a. The adhesive surface 29 of the adhesive tape 29
In the movable roller 26a portion, c is exposed on the front surface side.

According to the paper discharge mechanism 25 having the above structure, when the stencil sheet 3 after printing is discharged, the plate cylinder 1 is rotated to position the rear end portion 3b of the stencil sheet 3 at the position of the movable roller 26a. , The movable roller 26a is moved in the D direction. As a result, the adhesive tape 29 on the movable roller 26a is adhered to the rear end portion 3b of the stencil sheet 3.

Thereafter, when the winding shaft 28a is rotated in the E direction while the plate cylinder 1 is rotated in the direction opposite to the rotation direction (direction A) at the time of printing, the adhesive tape 29 is taken up and, as shown in the drawing, The used stencil sheet 3c is also the winding shaft 28
Can be rolled up. At this time, since the adhesive force of the adhesive tape 29 is greater than the adhesive force of the ink between the plate cylinder 1 and the stencil sheet 3, the winding after the above-mentioned adhesion can be easily performed.

FIG. 13 is a perspective view showing still another plate discharging mechanism 30. The plate discharge mechanism 30 is the plate discharge mechanism 8 described above.
It is arranged in place of 6, 25. In the plate discharge mechanism 30, a support shaft 31a as a moving unit 31 extending from the side of the plate cylinder 1 is configured to be rotatable by a drive source (not shown), and the support shaft 31a linearly reciprocates to a middle position such as a plunger. The expansion / contraction mechanism 31b is built in, and its length is variable. The tip of the support shaft 31a is a bent portion 31c that is bent in parallel with the plate cylinder 1, and a winding shaft 32 is rotatably supported on the bent portion 31c. Is wound.

Above the winding shaft 32, an adhesive application section 33 is provided.
Is provided. In this adhesive application section 33, an application roller 33a provided on the lower side is configured to be rotatable, and an adhesive provided in the inside is impregnated with an adhesive, and the nonwoven is applied to the outer periphery of the application roller 33a. The adhesive is applied in contact with the surface. Therefore, as shown in the drawing, when the support shaft 31a is rotated upward and the support shaft 31a extends, the application roller 33a of the adhesive application section 33 contacts the peripheral surface of the winding shaft 32, and the winding shaft 32a. Apply an adhesive of a predetermined width to.

Next, as shown in the schematic view of the side view of FIG. 14, the plate cylinder 1 is moved and positioned so that the position of the needle-shaped portion 2 is at the position of the winding shaft 32 when the printing is completed.
After that, when the support shaft 31a is contracted by the expansion / contraction mechanism 31b, the winding shaft 32 comes into contact with the rear end portion 3b of the stencil sheet 3. When the plate cylinder 1 is rotated in this state, the winding shaft 32 is hung and rotated, and the stencil sheet 3 is wound around the winding shaft 32 from the rear end portion 3b.

If the winding shaft 32 is bonded to the front end portion 3a of the stencil sheet 3, it can be wound from the front end portion 3a. Further, without rotating the plate cylinder 1, the support shaft 31a
It is also possible to wind the stencil sheet 3 by rotating G in the direction G in the drawing and rotating the winding shaft 32 in the direction H in the drawing by a rotation drive mechanism (not shown).

[0057]

According to the rotary stencil printing machine of the first aspect, the ink supplied from the plate cylinder side in a state where the stencil base paper and the printing paper by the stencil printing are in contact with each other is pressurized by air pressure to the printing paper side. Since the structure is transferred, there is an effect that the ink supply amount can be directly variably controlled, as compared with the conventional squeegee structure. This makes it possible to supply a large amount of ink and reduce the amount of waste paper at the beginning of printing. Further, since the pressure can be controlled according to the temperature and viscosity at the time of printing, it is possible to optimize the amount of ink transferred to the printing paper and prevent the set-off even when the printing paper is stacked. When the printing paper is conveyed by an endless belt in addition to the above-described construction as described in claim 2, printing can be performed with a simple structure without delivering the printing paper.

According to a third aspect of the present invention, after the ink is transferred to the printing paper, the ink is sucked from the inside of the plate cylinder at the closely contacted portion, so that more ink than is necessary. It is possible to minimize the amount of transfer to the printing paper without being left on the printing paper, prevent set-off, and improve print quality.

[Brief description of drawings]

FIG. 1 is a perspective view showing a rotary stencil printing machine of the present invention.

FIG. 2 is a side sectional view of the rotary stencil printing machine.

FIG. 3 is a side view showing another rotary stencil printing machine.

FIG. 4 is an operation diagram of the rotary stencil printing machine.

FIG. 5 is a side sectional view showing another embodiment of the rotary stencil printing machine of the present invention.

FIG. 6 is a side sectional view showing another embodiment of the rotary stencil printing machine of the present invention.

FIG. 7 is a partially enlarged view showing a plate mounting mechanism applied to the rotary stencil printing machine.

FIG. 8 is a partially enlarged plan view of a needle-shaped portion.

FIG. 9 is a diagram showing another example of the needle-shaped portion.

FIG. 10 is a partially enlarged side view showing a plate-setting operation.

FIG. 11 is a partially enlarged side view showing a plate discharge mechanism.

FIG. 12 is a perspective view showing another plate discharging mechanism.

FIG. 13 is a perspective view showing another plate discharging mechanism.

FIG. 14 is an operation schematic diagram of the plate discharge mechanism.

FIG. 15 is a side sectional view showing a conventional stencil printing machine.

16A and 16B are diagrams showing ink transfer states by a conventional stencil printing apparatus, respectively.

17 (a) and 17 (b) are diagrams showing ink transfer states by the rotary stencil printing apparatus of the present invention, respectively.

[Explanation of symbols]

1, 71 ... Plate cylinder, 3 ... Stencil paper, 40, 72 ... Screen, 47, 74 ... Endless belt, 45 ... Suction part, 47a ...
Vents, 50 ... Printing paper, 73 ... Partition film, K ... Ink.

Claims (3)

[Claims] 1. A rotary stencil printing machine in which a stencil sheet (3) is wound around an outer peripheral surface of a plate cylinder (1, 71) and ink (K) is supplied from the inside of the plate cylinder, with a printing paper (50). A rotary stencil printing machine comprising a means for pressurizing at least a part of the ink inside the plate cylinder by using air pressure at a portion in close contact with the stencil sheet. 2. In a rotary stencil printing machine in which a stencil sheet (3) is wound on the outer peripheral surface of a plate cylinder (1, 71) and ink (K) is supplied from the inside of the plate cylinder, the stencil sheet is wound. An endless belt (47, 74) is used as a pressing means for pressing the printing paper (50) onto the formed plate cylinder, and at least one of the inner side of the plate cylinder is in contact with the endless belt via the printing paper. A rotary stencil printing machine having a means for pressurizing a portion using air pressure. 3. In a rotary stencil printing machine in which a stencil sheet (3) is wound around an outer peripheral surface of a plate cylinder (1, 71) and ink (K) is supplied from the inside of the plate cylinder, the ink is supplied to the inside of the plate cylinder. From the stencil paper to the printing paper (5
After the ink is transferred to (0), it has a means for applying a negative pressure to a part of the inside of the plate cylinder at the portion where the printing paper and the stencil sheet are in close contact with each other. Stencil printer.