JPH0834155A - Plate discharge method and device of printing press - Google Patents

Abstract

PURPOSE:To form an extremely simple structure not using a feed roller becoming the cause of plate discharge deficiency, to certainly perform plate discharge operation and to enhance the receiving number of plates after plate discharge to a large extent. CONSTITUTION:An adhesive tape 29 coated with a pressure-sensitive adhesive comes into contact with the screen printing stencil paper on a plate cylinder 1 by a movable roller 26 to be bonded thereto and the movable roller 26a is separated from the plate cylinder 1 to peel the screen printing stencil paper 3. The peeled stencil paper 3 is wound around a winding shaft 28 along with the adhesive tape 29 to be held thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a stencil printing machine for rotationally driving a plate cylinder having a stencil sheet mounted thereon to print on a printing paper, and a method for discharging a stencil sheet from the plate cylinder of the printing machine. And a plate discharge device.

[0002]

2. Description of the Related Art A stencil sheet is mounted on the outer peripheral surface of a stencil sheet, and the ink is supplied to the stencil sheet on the outer peripheral surface of the plate cylinder. A stencil printing device for printing is known.

FIG. 14 is a side sectional view showing this stencil printing machine. The plate discharging mechanism 86 has a plate discharging claw 85 which is rotatable in the direction of the plate cylinder 81. After the end of the stencil sheet 3 wound around the outer periphery of the plate cylinder 81 is peeled off by the plate discharging claw 85, it is conveyed by a conveying roller 87. It is configured to be housed in the winding and discharging box 88. At the time of storage, the stencil sheet 3 is forcibly stored in the stencil box 88 by the rotational force of the transport roller 87, so that it is compressed in the stencil box 88.

Further, as another plate discharging mechanism, Japanese Patent Application Laid-Open No. 59-59
There is one disclosed in Japanese Patent Publication No. 155086, in which the stripped stencil sheet 3 is rolled and accommodated by a belt.

[0005]

However, in any of the plate discharging mechanisms described above, there is a risk that the stencil sheet 3 may wind around the conveying roller to cause a conveyance failure, and the former plate discharging mechanism 8 may be used.
In No. 6, there is a problem that even if the stencil sheet 3 is compressed, the restoring force is large due to the nature of the material of the stencil sheet 3 and the number of sheets that can be accommodated cannot be large. There was a drawback that the number of accommodated sheets could not be large.

The present invention has been made to solve the above problems, and has an extremely simple structure that does not use a conveying roller that may cause defective plate discharge, and can perform a reliable plate discharge operation, and can also be accommodated after plate discharge. It is an object of the present invention to provide a plate discharge method and device capable of significantly improving the number of sheets.

[0007]

In order to achieve the above object, a plate discharge method for a printing machine according to the present invention is a plate discharge method for discarding a plate detachably wound around an outer periphery of a plate cylinder of the printer after use. In the above, the plate cylinder is brought into contact with an adhesive having an adhesive force larger than the adhesion between the plate and the plate cylinder to a part of the plate, and then the adhesive is moved in a direction away from the plate cylinder. Is characterized in that the plate is separated from.

Further, the plate discharge device of the printing machine of the present invention is a plate discharge device for discarding the plate 3 removably wound around the plate cylinder 1 of the printing machine after use, in the vicinity of the outer periphery of the plate cylinder 1. And a moving means for moving the adhering means in a state where the plate is adhered to the adhering means, and a moving means for moving the adhering means. It is characterized by comprising a storage means for storing the plate.

Further, as described in claim 3, a long tape 29 coated with a pressure-sensitive adhesive as the adhering means.
The moving means is composed of a movable roller 26a for bringing the long tape into contact with the plate surface of the plate cylinder, and the accommodating means has a structure in which the long tape and the plate are adhered to each other. It can be constituted by a winding part 28 for accommodating both the length tape and the plate, and a drive means for rotationally driving the core part.

Furthermore, as described in claim 4, an adhesive applying section 33 containing an adhesive is used as the adhering means, and the moving means moves between the adhesive applying section and the plate cylinder. It is composed of a support shaft 31a which is in contact with the opposite surface of the plate cylinder in a state where the adhesive is applied, and a drive means for moving the support shaft, and the accommodating means is in a state where the plate is adhered to the support shaft, It can also be constituted by a winding portion 32 for accommodating and winding this plate and a drive means for rotationally driving the winding portion.

[0011]

The plate cylinder 1 is printed by rotating the plate cylinder 1 after the plate 3 is applied.
The stencil sheet 3 wound around the plate cylinder 1 is peeled from the plate cylinder 1 by the paper discharge mechanism. In this peeling, by using an adhesive having an adhesive force larger than the adhesive force between the plate and the plate cylinder, a part of the plate is brought into contact, and then the adhesive is moved in a direction away from the plate cylinder. The plate can be separated from the plate cylinder only by performing the above. Therefore, the long tape 29 coated with the pressure sensitive adhesive is attached to the movable roller 26.
After contacting the stencil sheet 3 on the plate cylinder 1 with a and adhering the long tape 29 and the plate 3 together, the long tape 29 and the plate 3 are peeled only by being housed in the winding part 28 together. And can be housed.

[0012]

1 is a perspective view showing a plate discharge mechanism 25 of the present invention. A front end portion 3a of the stencil sheet 3 is fixed to the platen portion 2 on the outer periphery of the plate cylinder 1, and the plate cylinder 1 rotates in the direction A in the drawing to print on the printing paper.

The plate discharge mechanism 25 is arranged in place of the plate discharge mechanism 86 shown in FIG.
It has a housing means 28 and an adhesive means 29. The movable roller 26a as the moving means 26 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 is located at a substantially central position of the shaft.
One end of the adhesive tape 29 is connected in advance.

The adhesive tape as the adhesive means 29 has a predetermined width and length and is wound, and the winding portion 29a is rotatably supported about 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. 2 is a perspective view showing another plate discharging mechanism 30. The plate discharging mechanism 30 is arranged in place of the plate discharging mechanisms 86 and 25. This plate discharge mechanism 30
A spindle 31a as a moving means 31 extending from the side of the plate cylinder 1
Is rotatably constituted by a drive source (not shown), and the support shaft 31a has a built-in retractable mechanism 31b which reciprocates linearly such as a plunger at an intermediate position, 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.

An endless belt 35 is in contact with the outer half of the plate cylinder 1 as shown in the figure. This endless belt 35
Are rotating rollers 36a to 3 at two upper and lower locations and two side portions.
It is folded back at 6d and follows the rotation of the plate cylinder 1. Therefore, in the stencil printing on the printing paper 50, the printing paper 50 is carried in from the lower position of the printing cylinder 1 when the printing cylinder 1 rotates in the A direction. After that, as the plate cylinder 1 rotates, the printing paper 50 undergoes stencil printing corresponding to the stencil image on the stencil sheet 3, and is carried out from the upper position of the plate cylinder 1.

Then, the plate portion 2 provided on the plate cylinder 1
Is formed by a plurality of needles 5 as will be described later, and this plate mounting portion 2 can easily pass through the contact surface portion with the endless belt 35 when the plate cylinder 1 rotates. At the same time, since the endless belt 35 is in contact with the plate cylinder 1 side with a predetermined pressure, the endless belt 35 can perform the plate-forming force of the stencil sheet 3 onto the plate-receiving portion 2.

Next, as shown in the schematic view of the side view of FIG. 3, the plate cylinder 1 is moved and positioned so that the position of the plate mounting 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).

Next, FIG. 4 is a side sectional view showing another stencil printing machine. In this stencil printing apparatus 70, a plate cylinder 71 is rotatable in the direction A in the drawing, 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, is provided between the centers of the inside of 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 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 can be in surface contact with at least a length of the screen 72 at a half portion of the plate cylinder 71 as shown in the figure. 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 the plate-mounting section 2 provided at the end of the screen 72 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 comes into close contact with the stencil sheet 3 on the screen 72. At the same time, ink K is
Initially, a predetermined pressure is applied from the inside of the plate cylinder 71, 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 close contact of 4 is released. After that, when the plate cylinder 71 rotates in the A direction, the plate cylinder 71 and the endless belt 74 sandwich and feed the printing paper 50, and the printing paper 50 is discharged from the lower part of the plate cylinder 71 in the same direction.

According to the stencil printing apparatus 70 described above, the plate cylinder 7
When 1 is in a stopped state, the endless belt 74 is brought into close contact with the plate cylinder 71, and an image corresponding to the stencil sheet 3 is printed.
Since the printing is performed on the upper side, it is possible to prevent blurring or unevenness of the printing due to the rotation as compared with the rotating 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.

A stencil printing section 70 of the above-mentioned stencil printing apparatus 70 is provided with the same plate mounting section 2. That is, the plate unit 2 is provided at the front end of the plate cylinder 71 on the side of the screen 72. Then, in the plate-pressing operation on the plate cylinder 71, the stencil sheet 3 is printed on the stencil sheet 3 while rotating the plate cylinder 71 in the direction A in a state where the needle-shaped portion 2 is located at the upper position of the plate cylinder 71. Similar to the paper 50, it is only necessary to carry in from the upper position of the plate cylinder 71. After that, the endless belt 74 makes surface contact with the plate cylinder 71, so that the stencil sheet 3 is sandwiched between the endless belt 74 and the plate cylinder 71 and can be set on the plate section 2. In the stencil printing apparatus 70 as well, the endless belt 74 is used for the plate cylinder 7 as in the stencil printing apparatus 30.
The stencil sheet 3
The endless belt 74 can exert the plate-forming force on the needle-shaped portion 2. The stencil sheet 3 placed on the plate placing section 2 is ejected by the plate ejecting mechanisms 25 and 30 shown in FIGS.

Next, the stencil sheet 3 is mounted on the plate cylinder 1 by a plate mounting apparatus shown in a partially enlarged view of FIG. The plate mounting portion 2 provided on a part of the outer periphery of the plate cylinder 1 is specifically configured by a needle-shaped portion 2 having a predetermined length and width. 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. 6, 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. 7, the needles 5 may be randomly provided 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. 5, and the front end portion 3a is positioned on the plate making device 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 moving 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. 8, the stencil sheet 3 located on the needle-shaped portion 2 is passed through each of the needles 5 by the pushing force of the pushing roller 11, and the pushing roller 11 is made into a needle. Shape 2
By moving the stencil sheet 3 up to the end, one end of the stencil sheet 3 can be locked only by the area of the needle-shaped portion 2 having a small width and length.

Thereafter, as shown in FIG. 5, the plate cylinder 1 rotates in the direction A, and at the same time, the printing paper is fed and printing is carried out. The stencil sheet 3 has its 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 planted, 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.

FIG. 9 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 located on the plate 21 for plate discharge at the time of plate mounting,
At the time of discharging the plate, by moving the plate 21 for discharging the plate upward as shown in the drawing, the front end portion 3a of the stencil sheet 3 can be simultaneously removed from the needle 5 of the needle portion 2. The stencil sheet 3 thus removed from the needle-shaped portion 2 is the plate discharge mechanism 2
It can be peeled off from the plate cylinder 1 by 5, 30.

The stencil sheet 3 is mounted on the plate cylinder 1 by
It can also be performed by the existing plate-setting device shown in FIG. In this plate mounting apparatus, a magnet plate 82 is provided along the outer peripheral ridge of the plate cylinder 81 shown in the figure, and a metal plate 83 is detachably provided on the magnet plate 82. Then, by sandwiching the stencil sheet 3 between the metal plate 83 and the magnet plate 82, the stencil sheet 3 is mounted on the plate cylinder 81.

Next, the structure of the stencil printing machine provided with the plate discharging mechanism will be described. FIG. 10 is a perspective view showing a stencil printing machine of another example, and FIG. 11 is a sectional side view of the same.
The cylindrical plate cylinder 1 is provided with a screen 40 having a large number of holes on the outer periphery, and inside the plate cylinder 1, two squeegee plates 43, 44 fixed to the apparatus and in contact with the inner peripheral surface 1a of the plate cylinder 1 and A suction unit 45 is provided. These two squeegee plates 4
A double squeegee is composed of 3,44.

The squeegee plates 43, 44 are formed in a plate shape having a length corresponding to the width of the opening portion 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 ventilation hole 47a is formed in a part of the center of the conveyor belt 47, and a mesh-shaped ventilation member is provided in the ventilation hole 47a. The ventilation hole 47 a is moved by the transportation of the transportation belt 47.
1 along the moving position of the vent hole 47a on the lower surface of FIG.
The suction unit 49 shown in 1 is provided. 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 stencil printing machine having the above construction will be described. When the plate cylinder 1 is rotationally driven in the A direction after the stencil sheet 3 is applied, 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 sheet feeding cassette 56 (the state shown in FIG. 10), the lowermost printing paper 50 is sucked by the suction unit 4 through the ventilation hole 47a.
The sheet 9 is sucked by 9 and is temporarily attached to the upper surface of the conveyor belt 47, 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 printed 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 is immediately sucked by the suction unit 45 in a direction away from the printing paper 50 by a predetermined amount, so that an excessive amount of ink is removed. The amount of ink that is returned to the inside of the printing paper 50 and adheres to the printing paper 50 is reduced. In other words, once the ink K is placed on the print sheet 50, the ink K in the placed area is not completely sucked and returned.
The ink K that is excessively projected in the height direction on the 0th surface is sucked by the suction portion 45, and the print quality can be improved.

Immediately after this printing, the printing paper 50 is temporarily attached to the surface of the conveyor belt 47 through the ventilation hole 47a by the suction portion 49 again. Therefore, the printing paper 50 does not adhere to the plate cylinder 1 and is discharged to the discharge portion. Is conveyed in the direction.

As another configuration example of the stencil printing machine, as shown in the side view of FIG. 12, 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 retracted in a direction away from the plate cylinder 1 as shown in FIG. 13 when the stencil sheet 3 is mounted and discharged as described above, and the plate cylinder 1 is rotated along with the plate mounting and discharging. It is configured so that it does not interfere with.

Further, as shown in FIG. 13, a holding means 60 for stacking and holding the printing paper 50 is provided as another paper feeding mechanism, and the pickup roller 61 provided at the end of the uppermost surface of the printing paper 50 conveys the printing paper 50 one by one. It can be configured to be passed to the belt 47. In this case, the printing paper 50 is the lifting plate 6
2 and is loaded on the upper and lower plates 62 by a moving mechanism (not shown).
The uppermost surface of the upper printing paper 50 is always the pickup roller 6
It is configured to be in contact with 1.

[0055]

According to the plate discharging method of the present invention, the plate which has been deposited on the plate cylinder is bonded by using an adhesive having an adhesive force larger than the adhesive force between the plate and the plate cylinder due to the ink. After the agent is brought into contact with a part of the plate, the adhesive can be moved away from the plate cylinder to separate the plate from the plate cylinder.

Further, according to the plate discharging apparatus of the present invention, an adhering means is provided near the outer periphery of the plate cylinder so as to be movable back and forth in the direction of the center of the plate cylinder, and the plate is adhered to the adhering means by the moving means. It is configured to move the means and to accommodate the plate moved by the accommodating means, and since the adhesive means directly contacts the plate and peels off the plate from the plate cylinder, the conventional conveying roller that causes defective plate ejection It becomes possible to perform reliable plate discharge without the risk of plate discharge failure without using it. This has an effect that it can be provided at low cost because of its extremely simple structure.

According to a third aspect of the present invention, a long tape coated with a pressure-sensitive adhesive is used as the adhering means, and the moving means is constituted by a movable roller for bringing the long tape into contact with the plate surface of the plate cylinder. Since the accommodating means is composed of a winding part for accommodating both the long tape and the plate in a state where the long tape and the plate are adhered and a driving means for rotationally driving the core part, The used plate is directly rotated on the winding part by rotating the winding part.
Since it is simply rolled up and stored, there is no need for peripheral devices for winding up, and since there is no effect of the plate's restoring force, the number of sheets that can be stored can be greatly improved, and space can be saved. Have the effect of. This effect is achieved by the adhesive application section applying the adhesive according to claim 4,
The same can be obtained by a plate discharge device including a support shaft to which an adhesive is applied and which moves in the plate cylinder direction, and a winding unit which winds the separated plate.

[Brief description of drawings]

FIG. 1 is a perspective view showing a plate discharge device of a printing machine according to the present invention.

FIG. 2 is a perspective view showing another example of a plate discharging device.

FIG. 3 is a schematic view of the operation of the plate discharging apparatus.

FIG. 4 is a side sectional view showing an example of a stencil printing machine provided with the plate discharging apparatus.

FIG. 5 is a partially enlarged view showing a plate-setting device.

FIG. 6 is a partially enlarged plan view of a needle-shaped portion.

FIG. 7 is a diagram showing another example of the needle-shaped portion.

FIG. 8 is a partially enlarged side view showing a plate-setting operation.

FIG. 9 is a partially enlarged side view showing a plate discharge mechanism provided in the plate mounting apparatus.

FIG. 10 is a perspective view showing an example of a stencil printing machine.

FIG. 11 is a side sectional view of the stencil printing machine.

FIG. 12 is a side view showing another stencil printing machine.

FIG. 13 is an operation diagram of the stencil printing machine.

FIG. 14 is a side sectional view showing a conventional plate discharging mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Plate cylinder, 3 ... Stencil sheet, 3a ... Front end part, 3b ... Rear end part, 25, 30 ... Plate discharge mechanism, 26a ... Movable roller, 28
a ... Winding shaft, 29 ... Adhesive tape, 31a ... Spindle, 32 ...
Winding shaft, 33 ... Adhesive coating section.

Claims (4)

[Claims] 1. A plate discharge method in which a plate removably wound around the plate cylinder of a printing machine is discarded after use, wherein an adhesive material having an adhesive force greater than the adhesive force between the plate and the plate cylinder is used. A plate discharge method for a printing press, wherein the plate is separated from the plate cylinder by contacting a part of the plate and then moving the adhesive away from the plate cylinder. 2. A plate discharge device for discarding a plate (3) removably wound around an outer periphery of a plate cylinder (1) of a printing machine after use, the plate cylinder being provided near the outer periphery of the plate cylinder. Adhering means that can move back and forth in the direction of the center of the plate, moving means for moving the adhering means in a state where the plate is adhered to the adhering means, and accommodating means for accommodating the plate moved by the moving means,
A plate discharge apparatus for a printing press, comprising: 3. A long tape (29) coated with a pressure-sensitive adhesive is used as the adhering means, and the moving means comprises a movable roller (26a) for bringing the long tape into contact with the plate surface of the plate cylinder. ), The accommodating means rotates the winding part (28) for accommodating and winding the long tape and the plate together with the long tape and the plate bonded to each other, and the winding core part. The plate discharging device for a printing press according to claim 2, wherein the plate discharging device comprises a driving means for driving. 4. An adhesive applying section (33) containing an adhesive is used as the adhering means, and the moving means moves between the adhesive applying section and the plate cylinder to apply the adhesive. A support shaft (31a) that is in contact with the opposite side of the plate cylinder in the state and a drive means for moving the support shaft, and the accommodating means is a state in which the plate is adhered to the support shaft,
3. The plate discharge device for a printing press according to claim 2, comprising a winding section (32) for winding and accommodating the plate and a driving means for rotationally driving the winding section.