JP3187546B2 - 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 stencil printing machine,
More particularly, the present invention relates to a printing ink side leakage prevention structure in an inking apparatus using a stencil plate cylinder having a multilayer structure.

[0002]

2. Description of the Related Art A stencil printing plate cylinder having a multilayer structure in which a mesh-shaped screen layer is wound around the perimeter of a perforated plate cylinder body and a stencil sheet is wound and mounted around the perimeter of the screen layer body, 2. Description of the Related Art A stencil printing apparatus that supplies printing ink from the inside of the plate cylinder main body by a squeegee member that slides on the inner peripheral surface of the plate cylinder main body is well known. ing.

Conventionally, in a stencil printing plate cylinder used in a stencil printing apparatus as described above, the supply of printing ink to the stencil sheet is effectively performed over the entire width of the porous structure area of the plate cylinder body. The width of the screen layer body is adjusted so that the effective width of the squeegee member is longer than the width of the porous structure area of the plate cylinder body, and accordingly, the screen layer covers the entire porous structure area of the plate cylinder body. Is larger than the width of the porous structure region.

[0004]

In the stencil printing apparatus as described above, the printing is performed from the inside of the plate cylinder in comparison with the amount of printing ink consumed by printing, such as when printing is performed with low ink consumption. When the amount of printing ink increases, excess printing ink is left between the screen layer body and the stencil paper wrapped around the screen layer, so that the amount of printing ink in this portion excessively increases, and every time printing is performed, The press pressure causes the printing ink to gradually spread in the width direction of the plate cylinder using the screen layer as a transmission path, and eventually the printing ink leaks to the side from the side edge of the stencil paper. May occur. This side leakage phenomenon causes the inside of the stencil printing machine to be stained with printing ink,
It also causes the printing paper to become dirty.

The present invention has been made in view of the above-described problems in the conventional stencil printing apparatus, and has been made in consideration of the amount of printing ink consumed by printing and the amount of printing extruded from the inside of a printing cylinder. It is an object of the present invention to provide an improved stencil printing apparatus in which the side leakage phenomenon, that is, the side leakage of the printing ink does not occur even when the amount of the ink increases.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a stencil sheet having a mesh-like screen layer wound around an outer periphery of a plate cylinder body having a porous structure, and a stencil sheet being wrapped around the outer periphery of the screen layer body. In a stencil printing apparatus that uses a stencil printing plate cylinder having a multilayer structure to be wound and mounted and supplies printing ink from the inside of the plate cylinder body by a squeegee member that slides on the inner peripheral surface of the plate cylinder body, the screen includes the screen. The width of the layer body is smaller than the width of the porous structure area of the plate cylinder body, the screen layer body does not exist on both side edges of the porous structure area, and the effective width of the squeegee member is the porous structure of the plate cylinder body. The squeegee member does not slide on both side edges of the porous structure area shorter than the width of the area, and a stencil sheet having a width greater than the width of the screen layer is mounted on the outer periphery of the screen layer. It is achieved by the stencil printing machine which, characterized in that it is.

[0007]

According to the above construction, since the squeegee member does not slide on both side edges of the porous structure region of the plate cylinder main body, the squeegee member is located on both side edges of the porous structure region. There is no squeezing of the printing ink, no printing ink is supplied from this part,
Since the screen layer body is not present on both side edges of the porous structure area and the width of the stencil paper attached to the outer periphery of the screen layer body is larger than the width of the screen layer body, excess printing ink is removed from the screen layer. The ink is left between the stencil body and the stencil wrapped around the outer periphery of the stencil sheet, and a press pressure acts on the printing ink to cause the printing ink to propagate in the width direction of the plate cylinder using the screen layer body as a transmission path, thereby forming the screen layer body. Even if the printing ink leaks from the side edge to the side, the printing ink is returned to the inside of the plate cylinder from both side edges of the porous structure area which is the printing ink non-use area under the press pressure.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of the present invention.

1 to 4 show one embodiment of a stencil printing apparatus according to the present invention. In these figures, reference numeral 1 denotes a stencil printing plate cylinder. A squeegee blade 5 made of a rubber-like elastic material is arranged in the stencil printing plate cylinder 1 by a squeegee support member 3 so as to slide on the inner peripheral surface of the stencil printing plate cylinder 1 at a predetermined squeegee angle.

The squeegee blade 5 is a stencil printing plate cylinder 1.
2, the printing ink P is formed by the rotation of the printing ink in the counterclockwise direction in FIG. 2, and the printing ink in the ink pool P is stenciled with the rotation of the stencil printing plate cylinder 1 in the counterclockwise direction in FIG. Squeezing is performed on the printing plate cylinder 1.

A stencil sheet S is provided on the outer peripheral surface of the stencil printing plate cylinder 1.
Is wound, and the printing paper (not shown) is pressed against the stencil sheet S by the press roller 7 while the stencil printing plate cylinder 1 is rotating counterclockwise in FIG. 2, thereby performing stencil printing. It has become.

The stencil printing plate cylinder 1 has a multilayer structure including a plate cylinder main body 9 and a screen layer body 11 wrapped around the outer periphery of the plate cylinder body 9, and a stencil sheet S is wound around the outer periphery of the screen layer body 11. It is designed to be attached.

The plate cylinder body 9 is made of a metal such as stainless steel having a plate thickness of about 0.15 mm, and has a predetermined circumferential dimension and a lateral width dimension W13 to form a porous structure area section 13.
The porous structure region 13 has a diameter of 0.15 to 0.25 m.
It has a large number of holes having a size of about m at a pitch of about 1.0 to 0.5 mm, and has a printing ink passage structure.

The screen layer body 11 is formed of a mesh sheet in which a metal such as nickel is coded on a woven sheet formed by spinning a fluorine resin fiber or the like.
The number of meshes of the screen layer body 11 is 100 to 500.
Degree.

The width W11 of the screen layer body 11 is shorter than the width W13 of the porous structure area 13 of the plate cylinder body 9, so that the screen layer body 11 does not exist on both side edges of the porous structure area 13. . The both side edge regions of the porous structure region 13 where the screen layer body 11 does not exist are indicated by reference numeral 15 in the figure so as to be distinguished from other regions of the porous structure region 13. The width W13 of the porous structure region 13 is 250
If it is about 260 mm, the width W11 of the screen layer body 11 may be about 240 to 250 mm, and the width dimension of both side edges of the porous structure region 13 where the screen layer body 11 does not exist may be about 5 mm.

In this case, the width W13 of the porous structure area 13 is larger than the effective printing width, and the screen layer 1
The width W11 of one becomes equal to the effective printing width, and these widths may be set according to the required effective printing width.

The stencil sheet S is mounted on the outer peripheral portion of a screen layer body 11 which forms the outer peripheral surface of the stencil printing plate cylinder 1, and the width Ws of the stencil sheet S is the width W11 of the screen layer body 11 and the porous structure area. 13 and is attached to the outer peripheral portion of the screen layer body 11 in such a manner as to cover the whole of the screen layer body 11 and the porous structure area 13.

The squeegee blade 5 is located inside the plate cylinder main body 9 and extends in the axial direction of the plate cylinder main body 9, that is, in the lateral width direction. The width of the stencil sheet S is substantially equal to the width Ws of the stencil sheet S.
5 has a cutout opening 17. The squeegee blade 5 does not slidably contact the inner peripheral surface of the plate cylinder body 9 at the notch opening portion 17, and has an effective width dimension W5.
Is smaller than the width W13 of the porous structure area 13 as an inner dimension between the notch openings 17, and is equal to the width W11 of the screen layer body 11.

According to the above-described configuration, the squeegee blade 5 does not slide on the both side edge regions 15 of the porous structure region 13 of the plate cylinder main body 9.
Is not subjected to squeezing of the printing ink from the squeegee blade 5 and the printing ink does not flow out of the plate cylinder body 9 from this portion. The screen layer body 11 is not present in both side edge areas 15 of the porous structure area 13, and the width of the stencil sheet S mounted on the outer periphery of the screen layer body 11 is smaller than the screen layer body 1.
When the width is larger than 1, the side edge regions 15 of the porous structure region 13 are directly covered with the stencil sheet S.

As a result, excess printing ink is left between the screen layer body 11 and the stencil sheet S wrapped around the screen layer body 11, and a press pressure acts on this printing ink to cause the printing ink to flow. When the printing ink spreads in the width direction of the plate cylinder as a transmission path and leaks from the side edge of the screen layer body 11 to the side as shown by the arrow in FIG. Figure 4
As shown by arrows, the printing ink is returned to the inside of the plate cylinder body 9 from both side edge areas 15 of the porous structure area 11, which is a printing ink non-use area, and the excess printing ink reaches the side edges of the stencil sheet S. Is avoided.

In the above-described embodiment, the total length of the squeegee blade 5 is longer than the width W13 of the porous structure area 13 and the porous structure area 13 is formed outside the cutout opening 17.
Of the squeegee blade 5 at both ends of the porous structure region 1
3 is effective in preventing the strength of the porous structure region 13 from being reduced due to being within the region 3. However, if this is not necessary, as shown in FIG. 5, the squeegee blade 5 is omitted in the portion outside the notch opening 17, and the entire length is defined as the effective lateral width W5, and the porous structure region 1 is formed.
3 may be shorter than the width W13 of the screen layer 11 and equal to the width W11 of the screen layer body 11.

[0022]

As can be understood from the above description, according to the stencil printing apparatus of the present invention, the squeegee member does not slide on the both side edges of the porous structure area of the plate cylinder main body. On both side edges of the region, printing ink is not squeezed from the squeegee member, printing ink is not supplied from this portion, and the screen layer body exists on both side edges of the porous structure region. That the width of the stencil paper attached to the outer periphery of the screen layer is larger than the width of the screen layer,
Excess printing ink is left between the screen layer body and the stencil wrapped around the screen layer, and press pressure acts on this printing ink so that the printing ink travels in the width direction of the plate cylinder using the screen layer body as a transmission path. Even if it leaks out from the side edge of the screen layer body to the side, the printing ink returns to the inside of the plate cylinder from both side edges of the porous structure area, which is a printing ink non-use area, under the pressing pressure. As a result, the excess printing ink is collected, and the excess printing ink does not reach the side edges of the stencil sheet, so that the excess printing ink is extruded from the inside of the plate cylinder in comparison with the amount of printing ink consumed by printing. Even if the amount of printing ink to be used increases, it is possible to reliably prevent the occurrence of side leakage.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a stencil printing apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view showing one embodiment of a stencil printing apparatus according to the present invention.

FIG. 3 is a sectional view showing an embodiment of a stencil printing apparatus according to the present invention with respect to main parts thereof.

FIG. 4 is an enlarged cross-sectional view showing one embodiment of a stencil printing apparatus according to the present invention for a main part thereof.

FIG. 5 is a cross-sectional view showing another embodiment of the stencil printing apparatus according to the present invention with respect to main parts thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stencil printing plate cylinder 5 Squeegee blade 7 Press roller 9 Plate cylinder main body 11 Screen layered body 17 Notch opening S Stencil paper

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-105982 (JP, A) JP-A-1-120382 (JP, A) JP-A-60-165295 (JP, A) 162469 (JP, U) Japanese Utility Model 63-101565 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41L 13/00-13/18

Claims (1)

(57) [Claims] 1. A stencil printing plate cylinder having a multilayer structure in which a mesh screen layer body is wound around and mounted on a perimeter of a perforated plate cylinder body, and a stencil sheet is wound around and mounted on an outer periphery of said screen layer body. In a stencil printing apparatus that supplies printing ink from the inside of the plate cylinder main body by a squeegee member that slides on the inner peripheral surface of the plate cylinder main body, the width of the screen layer body is larger than the width of the porous structure area of the plate cylinder main body. The screen layer body is not present on both side edges of the porous structure area, and the effective lateral width of the squeegee member is shorter than the lateral width of the porous structure area of the plate cylinder body. A stencil printing machine characterized in that a stencil sheet having a width greater than the width of the screen layer body is mounted on the outer periphery of the screen layer body without sliding members.