JP2604016Y2 - Plate cylinder of stencil printing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate cylinder of a stencil printing machine for winding a thermosensitive stencil master perforated by a thermal head or the like.

[0002]

2. Description of the Related Art A stencil master used in a stencil printing apparatus includes a very thin thermoplastic synthetic resin film such as polyester (hereinafter, simply referred to as a "film") and a synthetic fiber or a porous flexible support. It has a laminated structure in which Japanese paper or a mixture of Japanese paper and synthetic fibers is laminated. For this master, the stencil printing machine
A heating element such as a thermal head performs perforation and perforation on the film portion, automatically transports the master and automatically winds it around the outer peripheral surface of a porous cylindrical plate cylinder, and presses the master with a press roller or the like. The means continuously presses the printing paper to perform printing by oozing ink from the opening provided in the plate cylinder and the perforated portion of the master.

[0003] Since the above-mentioned master uses Japanese paper or the like as a support, the passage of the ink is hindered at the portion where the Japanese paper fibers are entangled, the ink does not transfer to the printing paper, and a fiber pattern appears on the solid portion. In addition, there is a problem that fiber lines are commonly used, in which thin lines or the like are blurred.

[0004] Therefore, it is possible to prevent generation of fibrous eyes by to perform the printing master comprising only not in the film itself using Japanese paper or the like as a support, and retention of the ink to the paper fibers Since the ink is diffused , if the support is removed, a problem such as a so-called perforation or a perforation in which a punch hole of the plate cylinder support is generated in an image occurs. Therefore, using a screen with a fine mesh as the mesh screen layer of the plate cylinder,
The above problem is prevented by increasing the number of windings on the plate cylinder, but the production cost of the plate cylinder becomes high, and ink passage becomes unstable, and density unevenness occurs locally. There is a problem that is worse.

[0005] Conventionally, there is no full-scale technique for solving the above-mentioned problems, but for example, Japanese Patent Publication No. 63-59393.
As shown in the publication, a cylindrical plate cylinder of a stencil printing machine is composed of a supporting cylinder having a large number of small holes from the inside thereof, an intermediate screen layer, and an outer surface screen layer that contacts the master. Then, a method is adopted in which the mesh value is gradually increased from the support cylinder to the outer surface screen layer through the intermediate screen layer.

[0006]

However, in the prior art, when the master has a support such as Japanese paper, the master is pressed against the mesh screen layer of the plate cylinder by a press roller or the like during printing. At the same time, it acted as a cushion between the mesh screen layer and the film to prevent the film from being torn or peeling off from the plate cylinder, but as shown in FIG. In the case of the master, since the film 52 directly contacts the mesh screen layer 51 of the plate cylinder, the portion of the film 52 that contacts the mesh projections 53 of the mesh screen layer 51 is pressed when the printing paper 54 is pressed during printing. There is a problem that a fine hole is generated due to abrasion due to the frictional force, and the ink passes through the printing paper in a dot-like manner, causing a phenomenon of background contamination.

Therefore, the present invention solves the above-mentioned problems by using a master made of only a film alone, and is inexpensive to obtain a clear image free from fibrous eyes, punches and background stains. An object of the present invention is to provide a plate cylinder of a stencil printing machine.

[0008]

Means for Solving the Problems The invention according to claim 1 is:
A stencil master made of only a thermoplastic resin film is wound on the outer peripheral surface, and while being supplied with ink from the inner peripheral surface, in a plate cylinder of a stencil printing machine that rotates around its central axis,
The plate cylinder is composed of only a porous and cylindrical support layer forming the inner peripheral surface, or the support layer and a mesh screen layer forming the outer peripheral surface. The pores are 65 mesh or more in terms of mesh value, and the aperture ratio is 25% or more.

Here, the mesh value 65 means that there are 65 rows of holes per inch.

According to a second aspect of the present invention, there is provided a stencil printing machine in which a stencil master made of only a thermoplastic resin film is wound around an outer peripheral surface, and is rotated around its central axis while ink is supplied from an inner peripheral surface. In the plate cylinder, the plate cylinder includes a porous cylindrical support layer forming the inner peripheral surface, and a mesh screen layer forming the outer peripheral surface, and the mesh screen layer is formed of a fibrous material. The fibrous material is formed so as to intersect in a mesh pattern, and a smooth surface is formed at the intersection of the fibrous material at the contact surface with the stencil master.

According to a third aspect of the present invention, a stencil master is wound around an outer peripheral surface, and ink is supplied from an inner peripheral surface while rotating around a central axis of the stencil master. It is composed of a porous cylindrical support layer forming the inner peripheral surface and a mesh screen layer forming the outer peripheral surface, and at least the surface of the mesh screen layer that contacts the stencil master is filled with an ink-permeable porous material. Is characterized by the following:

[0012]

According to the invention as defined in claim 1, the thermoplastic resin foil is used.
A stencil that prints using a stencil master consisting of only a film
In a printing apparatus, the plate cylinder is composed of only a porous cylindrical support layer, or this support layer and a mesh screen layer forming the outer peripheral surface of the plate cylinder, and the aperture of the support layer is converted to a mesh value. , The opening ratio was set to 65 mesh or more, and the opening ratio was set to 25% or more, so that the ink was sufficiently transferred to the printing paper, and the punch streaks became inconspicuous.

According to the second aspect of the present invention, a stencil mask composed of only the thermoplastic resin film of the mesh screen layer is provided.
Since a smooth surface is formed at the intersection of the fibrous material at the contact surface with the star, the contact area between the mesh screen layer and the stencil master is increased, and the wear of the stencil master by the printing paper is reduced.

According to the third aspect of the present invention, the surface of the mesh screen layer in contact with the stencil master is smoothed by filling with an ink-permeable porous material, so that the mesh screen layer and the stencil master are in contact with each other. The contact results in less wear of the stencil master by the printing paper.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 100 denotes a plate cylinder. Plate cylinder 1
00 is a porous, cylindrical support layer 1 forming an inner peripheral surface.
And a mesh screen layer 2 forming the outer peripheral surface. The plate cylinder 100 is rotatably supported around a rotation center axis also serving as an ink pipe 7 described later, and is rotationally driven in the direction of arrow Y by a motor (not shown).

The support layer 1 is formed of a metal such as stainless steel in a cylindrical shape, and has a clamping means 17 on its outer peripheral surface for clamping the stencil master 3 composed of a single film. As shown in FIG. 2 (a) or (b), a large number of openings 18 are formed in the support layer 1 at other portions except for the clamping means 17 and the peripheral portion thereof to allow ink to pass therethrough. Have been. The mesh screen layer is shown in FIG.
As (b), the fibrous material such as synthetic resin fibers or stainless steel fibers, such as Tetron or nylon crossed reticulated, smooth surface at the intersection 19 of the fibrous material definitive the contact surface between the stencil master 3 15, and the mesh value is set to 100 to 420. The smooth surface 15 is formed by polishing the intersecting portion 19 of the fibrous material, crushing by passing between the rolls, or thermally deforming with a heat roll.

In order to determine the mesh value and the aperture ratio of the support layer 1 so that the printed image does not have a punch, an experiment was conducted by combining 0 to 2 mesh screen layers 2 described above. Here, the aperture ratio refers to, for example, FIG.
In the case of the support layer 1 shown in (b), it is represented by the following equation (1).

[0018]

(Equation 1)

As a result of the experiment, when the openings 18 of the support layer 1 were 65 meshes or more in terms of mesh value, punches were not conspicuous in the printed image. Further, when the mesh value of the support layer 1 was 80 mesh or more, an image without punches was obtained even without the mesh screen layer 2. The higher the mesh value of the support layer 1 is, the less likely it is that a punch is formed in the printed image. However, the support layer 1 forms the openings 18 by etching or the like. The pitch becomes small, and the holes are connected to each other or the holes are not opened. On the other hand, when the mesh value is increased, the diameter of the holes becomes smaller, so that it is difficult for ink to pass through the support layer 1, and the amount of ink passing therethrough decreases, and the density of the printed image decreases. Therefore, the mesh value of the support layer 1 is preferably set to 120 mesh or less. Further, if the aperture ratio of the support layer 1 is small, punches occur in the printed image. Conversely, if the aperture ratio is large, the support layer 1
The strength is reduced, and the support layer 1 is deformed due to the pressing and rotation of the press roller, generating abnormal noise, and excessive force is applied to the master 3 to reduce the printing durability. It is desirable to do.

For example, as shown in FIG.
Are arranged, the mesh value is 65 mesh, and the aperture ratio is 25
%, The diameter D of the opening 18 and the opening 1
The pitch P of 8 is given by the following equation (2).

[0021]

(Equation 2)

As shown in FIG. 2B, the apertures 18 are arranged, the mesh value is set to 65 mesh, and the aperture ratio is set to 25%. The pitch P is given by the following equation (3).

[0023]

(Equation 3)

The clamping means 17 is provided at a stage 13 provided along the generatrix of the outer peripheral surface of the support layer 1 and at a portion opposed to the stage 13, and has a clamper shaft 12.
and a clamper 12 having a magnet 14 swingably supported by a.

An ink roller 4 for supplying ink to the inner peripheral surface of the plate cylinder 100 and an ink roller 4
Are arranged in parallel with a slight gap between
A doctor roller 5 that forms an ink reservoir 6 between
An ink pipe 7 for supplying ink to the ink reservoir 5 is arranged. Here, the ink roller 4, the doctor roller 5, and the ink pipe 7 constitute an ink supply device.
A press roller 9 that presses the printing paper 8 against the plate cylinder 100 is disposed near the lower portion of the outer peripheral surface of the plate cylinder 100 facing the ink roller 4. The press roller 9 is rotatably supported at both ends of a shaft thereof by a pair of arms 11, and is freely movable toward and away from the plate cylinder 100 about a shaft 10 provided on the arm 11.

Next, the operation of the stencil printing apparatus will be described. In FIG. 1, the plate cylinder 100 is
The tip of the stencil master 3 is held between the magnet 14 of the clamper 12 and the stage 13. The stencil master 3 is wound around the outer peripheral surface of the mesh screen layer 2. First, one sheet of printing paper 8 is fed to a registration roller (not shown) by a paper feeding device (not shown), and is wound around the outer peripheral surface of the mesh screen layer 2 at a predetermined timing synchronized with the rotation of the plate cylinder 100 by the registration roller. The printing paper 8 is inserted between the stencil master 3 and the press roller 9. At this time, the ink roller 4 also rotates in the same direction as the rotation direction of the plate cylinder 100. The ink in the ink reservoir 6 is attached to the surface of the ink roller 4 by the rotation of the ink roller 4, and the amount thereof is regulated when passing through the gap between the ink roller 4 and the doctor roller 5. Supplied. The ink supplied to the inner peripheral surface of the support layer 1 is rotated by the further rotation of the ink roller 4 to open the holes 18 in the support layer 1.
Passing through the openings (not shown) of the mesh screen layer 2,
It is supplied to the surface of the stencil master 3 that comes into contact with the mesh screen layer 2. Then, the press roller 9 which has been separated from the outer peripheral surface of the plate cylinder 100 moves upward, and the printing paper is transferred to the stencil master 3 wound around the outer peripheral surface of the mesh screen layer 2 of the plate cylinder 100 rotating in the arrow Y direction. 8 is pressed, ink is printed from the perforated portion of the stencil master 3 on the printing paper 8.
It is transferred to the surface of and printed. Then, the printed printing paper 8 is peeled off from the outer peripheral surface of the plate cylinder 100 by a peeling nail (not shown), and is discharged to a discharge tray (not shown). Ends. Next, a predetermined number of prints are sequentially and continuously performed by the same operation as the above operation.

As described above, according to the embodiment shown in FIGS. 1, 2 and 3, the plate cylinder 100 is composed of the support layer 1 and the mesh screen layer 2, and the openings 18 in the support layer 1 are formed. Is converted to a mesh value of 65 mesh or more and the aperture ratio is set to 25% or more, so that the ink is sufficiently transferred to the printing paper 8 and the punches become inconspicuous. Further, since the smooth surface 15 is formed at the intersection 19 of the fibrous material in contact with the stencil master 3 of the mesh screen layer 2, the contact area between the mesh screen layer 2 and the stencil master 3 is increased, and the stencil printing paper 8 is used. The abrasion of the master 3 is alleviated, so that it is difficult to make a hole in the stencil master 3 and the background dirt is less likely to occur.

FIG. 4 shows another embodiment. The mesh screen layer 42 shown in this embodiment is smoothed by filling the ink-permeable porous substance 16 on both sides thereof. The mesh screen layer 42 is formed by forming the porous substance 16 such as porous resin or porous rubber into a sheet shape, sandwiching these sheets from both sides of the mesh screen layer 42, and then pressing a heated press die. Is done. In addition,
The operation of the stencil printing apparatus using the mesh screen layer 42 is the same as that of the embodiment shown in FIGS.

According to this embodiment, the surface of the mesh screen layer 2 which is in contact with the stencil master 3 is smoothed by filling with the ink-permeable porous substance 16, so that the mesh screen layer 2 is in contact with the stencil master 3. Are in surface contact, the abrasion of the stencil master 3 by the printing paper 8 is reduced, holes are less likely to be formed in the stencil master 3, and background contamination is less likely to occur.

[0030]

As described above, according to the first aspect of the present invention, the aperture of the support layer is made to be 65 mesh or more in terms of mesh value and the aperture ratio is made to be 25% or more. Is sufficiently transferred, the punch eyes become inconspicuous ,
Stamped using a stencil master consisting only of a plastic resin film
Even when printing is performed, a printed matter having good image quality can be obtained.

According to the second aspect of the present invention, a smooth surface is formed at the intersection of the fibrous material in contact with the stencil master made of only the thermoplastic resin film of the mesh screen layer. The contact area of the stencil master becomes large, the abrasion of the stencil master by the printing paper is eased, and a hole is hardly formed in the stencil master.

According to the third aspect of the present invention, since the surface of the mesh screen layer that contacts the stencil master is smoothed by filling the ink-permeable porous material, the contact between the mesh screen layer and the stencil master is reduced. As a result, the stencil master is less worn by the printing paper, and it is difficult to form a hole in the stencil master, so that the background stain is less likely to occur.

[Brief description of the drawings]

FIG. 1 is a sectional view of a plate cylinder of a stencil printing machine showing one embodiment of the present invention.

2 (a) is an enlarged plan view showing a part of a support layer having an opening of the plate cylinder shown in FIG. 1, and FIG. 2 (b) is an opening of the plate cylinder shown in FIG. FIG. 9 is an enlarged plan view showing a part of a support layer showing another example having the above.

3 (a) is an enlarged sectional view showing a part of the mesh screen layer of the plate cylinder shown in FIG. 1, and FIG. 3 (b) shows a part of the mesh screen layer of the plate cylinder shown in FIG. It is an enlarged plan view.

FIG. 4 is a sectional view of a main part of a plate cylinder showing another embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a plate cylinder according to the prior art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Support layer 2 Mesh screen layer 3 Master consisting only of thermoplastic resin film 15 Smooth surface 16 Porous material 17 Clamping means 18 Opening 19 Intersection 100 Plate cylinder

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41L 13/04 B41L 13/14

Claims (3)

(57) [Scope of request for utility model registration] 1. An outer peripheral surface made of only a thermoplastic resin film.
A stencil master is wound around the stencil master, and while the ink is supplied from the inner peripheral surface, the stencil printing machine rotates around the central axis thereof, wherein the plate cylinder has a porous cylindrical shape forming the inner peripheral surface. Or only this support layer, or this support layer and a mesh screen layer forming the outer peripheral surface, wherein the openings of the support layer are 65 mesh or more in terms of mesh value, and the aperture ratio is 25. % Of a stencil printing machine. 2. A stencil master of a stencil printing machine, wherein a stencil master made of only a thermoplastic resin film is wound on an outer peripheral surface and rotated around its central axis while ink is supplied from an inner peripheral surface. The body is composed of a porous and cylindrical support layer forming the inner peripheral surface, and a mesh screen layer forming the outer peripheral surface. The mesh screen layer is formed by intersecting a fibrous material in a mesh shape. A plate cylinder of a stencil printing machine, wherein a smooth surface is formed at the intersection of the fibrous material at the contact surface with the stencil master. 3. A plate cylinder of a stencil printing machine in which a stencil master is wound around an outer peripheral surface and ink is supplied from an inner peripheral surface, and rotates around a central axis thereof. A porous cylindrical support layer to be formed, and a mesh screen layer to form the outer peripheral surface, wherein the mesh screen layer is filled with an ink-permeable porous material at least on a surface in contact with the stencil master. A plate cylinder of a stencil printing machine characterized by being smoothed by: