JPH04332678A - Screen printing apparatus - Google Patents

Abstract

PURPOSE:To prevent the strike-through to printing paper and to improve the delivery arrangement of the printing paper by mounting a blower means in the same direction as the feed direction of the printing paper. CONSTITUTION:When printing paper is delivered, a blower means 15 is controlled, for example, by a control method due to a sensor or a method taking timing by a drive motor to control the blower means by a cam so as to be capable of blowing air to the printing paper from the leading end part thereof to the part on this side of the rear end part thereof. Air is blown so that the leading end of the printing paper impinges against the stopper 14 of a delivery stand 9. The angle (b) formed by a blow direction (c) and the feed direction (d) of the printing paper is pref. set to 10 deg. or less and it is most pref. that both directions are parallel. Air may be blown to the printing paper from above, below or both of above and below.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing apparatus, and more particularly to a stencil printing apparatus which can smoothly feed and discharge sheets without set-off.

0002

2. Description of the Related Art Conventionally, as a stencil printing apparatus, one having an integrated plate making section and a printing section as shown in FIG. 10 is known. In this apparatus, a document image read by a document reading section 1 is converted from an optical signal into an electrical signal and output to a perforation section 3 consisting of a heating element of a thermal plate making section, for example.

On the other hand, the stencil paper carried out from the stencil paper roll 2 is brought into direct contact with, for example, the heating element in the perforation section 3 while being conveyed, and is perforated by the heating element in this contact state.

Further, the base paper is conveyed along the guide plate 5 by the conveyance roller 6, and when its leading end is conveyed to the standby position of the clamper 13 of the plate cylinder 12, it is clamped and wrapped around the outer peripheral surface of the plate cylinder 12. It will be perforated. After reading the image area and punching, the cutter 4
The base paper is cut to a predetermined length at , thereby completing plate making and winding of the base paper around the plate cylinder 12 .

Thereafter, in response to a printing instruction, the printing paper P on the paper feed table 7 is moved by the press roller 1 against the base paper wrapped around the outer circumferential surface of the plate cylinder 12 rotated by the drive motor 8.
0, and the inking roller 1 is pressed onto the printing paper P.
Printing is performed by transferring the ink from No. 1, and the printed paper is ejected onto the paper ejection tray 9.

[0006] The above-mentioned stencil printing apparatus is, for example, disclosed in Japanese Patent Application Laid-Open No. 61
As disclosed in Japanese Patent Application No. 85463, there is known a printing press that includes a means for blowing air in a direction opposite to the conveying direction of the printing paper in order to prevent the paper from curling up.

[0007]

SUMMARY OF THE INVENTION The conventional stencil printing apparatus has a problem in that the air is blown in a direction opposite to the direction in which the printing paper is conveyed, which obstructs the conveyance of the paper. Furthermore, when discharging printed paper, the leading edge of the paper may not reach the stopper 14, such as when the image area of the printed paper is large, and it may rub against the surface of the printed matter stored on the paper discharging tray. As a result, there were problems in that set-off occurred and the alignment of discharged sheets also deteriorated.

Furthermore, for example, when the printing paper is not so-called stiff, static electricity is often generated due to contact between the papers or between the papers and the device, causing the paper to stick to the device, curling of the paper, This also causes problems such as curling up on the plate cylinder, resulting in poor paper feeding or poor paper ejection.

The present invention has been made to solve the above-mentioned problems, and its first object is to provide a stencil printing device that prevents set-off on printing paper and improves alignment of discharged sheets. There is a particular thing.

[0010] A second object of the present invention is to provide a stencil printing apparatus in which paper feeding defects and paper ejection defects are prevented.

[0011]

[Means for Solving the Problems] The above objects of the present invention are achieved by the following means. A first stencil printing device of the present invention is a stencil printing device in which a printing paper is pressed into contact with a stencil paper wrapped around the outer periphery of a cylindrical printing drum by a press roller to perform printing, in which the printing paper is moved in the same direction as the conveyance direction of the printing paper. It is characterized by comprising an air blowing means.

A second stencil printing device of the present invention is a stencil printing device in which printing paper is pressed against a stencil paper wrapped around the outer periphery of a cylindrical printing drum by a press roller to perform printing. It is characterized in that a wire is stretched from both ends of the printing paper through slits provided at both ends of the plate cylinder and to both ends of the paper discharge table at a position where both ends of the printing paper come into contact.

The present invention will be explained in detail below. The first stencil printing device of the present invention is characterized by the transportation of printing paper (paper feeding, printing,
It has means for blowing air in the same direction as the paper ejection direction. Air is blown when the ink is transferred to the printing paper in the device and then when the paper is ejected, and is applied to the entire width of the printing paper.

FIG. 1 shows an example of the arrangement of the blowing means 15 and its surrounding equipment used in the present invention. The air blowing means 15
can be additionally arranged in the conventional stencil printing apparatus outlined in Section 10.

The air blowing means 15 is controlled so as to blow air from the leading edge of the printing paper to just before the trailing edge of the printing paper when the printing paper is discharged. Examples include, but are not limited to, a control method using a sensor, a method in which timing is determined by a drive motor, and control is performed using a cam. The air is further blown so that the leading edge of the printing paper hits the stopper 14 of the paper discharge table 9.

[0016] As for the air outlet of the air blower, the one shown in FIGS. 2 and 3 is as follows.
Examples include shapes shown in, but are not particularly limited to. The thickness a of the nozzle air outlet is preferably small, and the wind speed is preferably high, but there are no limitations as long as it is within a range that does not cause any particular problems in terms of the device configuration.

Further, as shown in FIG. 5, the angle b formed between the air blowing direction c and the printing paper conveyance direction d is preferably 10° or less, more preferably 5° or less, and most preferably parallel. . In this case, the air may be blown from above the printing paper, from below, or from both above and below.

In the second stencil printing apparatus of the present invention, as shown in a partial explanatory diagram in FIG. It passes through the slits 23 provided near both ends and is pasted to both ends of the sheet discharge tray 9. By slightly touching the wire 22 near both ends of the printing paper, the wire functions as a guide rail, allowing smooth conveyance.

The installation positions of the wires near both ends of the paper feed table 7, plate cylinder 12, and paper discharge table 9 are not particularly limited as long as the printing characteristics of the present invention are not impaired. The wire used in the present invention is not particularly limited, and may include ordinary thin wire, piano wire, and the like.

Note that FIG. 9 shows how the printing paper P is conveyed on the paper feed tray 7 and the paper output tray 9 while making slight contact with the wire 22 near both ends, and FIG. Plate cylinder 1 with wire 22 passed through slits at both ends
It shows how it passes under 2.

The plate cylinder 12 and the printing paper P are uniformly separated from both ends of the paper so that it does not wrap around the plate cylinder.

The second stencil printing device of the present invention is particularly preferably a so-called heat-sensitive stencil printing device in which the perforation portion comprises a heating element.

Next, the present invention will be explained in more detail with reference to Examples. Example 1 As shown in Figure 1, when the leading edge of printing paper is detected, the blower fan is switched ON, and when the trailing edge is detected, the fan is switched OFF.
A sensor 16 such as F was installed, and an air blower 15 having an air outlet shape as shown in FIG. 2 was installed near the press roller 10 so that the traveling direction of the printing paper and the air blowing direction were parallel to each other. . Using a stencil printing device equipped with this air blower, stencil printing was carried out using a chart having a solid pattern on the front. The results obtained are shown in Table 1.

Example 2 As shown in FIG. 5, a blower device 18 having the shape of a blower port as shown in FIG. 3 was installed so that the traveling direction of the printing paper and the blowing direction were parallel to each other. In this case, as shown in FIG. 6, the air is blown by the drive motor 8 using the cam 19 when the leading edge of the printing paper passes, and when the printing paper passes the trailing edge, the air is blown by a piston timed to suck air. This was done using a system.

Using a stencil printing apparatus equipped with this air blower, stencil printing was carried out using the same chart as in Example 1. The results obtained are shown in Table 1.

Comparative Example 1 Example 1 was prepared using a conventional stencil printing device without a blower device.
, 2 was used for plate making printing, and the results are shown in Table 1.

[0027]

[Table 1] Note) Evaluation is by visual inspection. ◎　・・・　Very good 〇　・・・　Good △　・・・　Somewhat impossible ×・・・・Not possible

[0028]

According to the first stencil printing apparatus of the present invention, a stencil printing apparatus which is free from set-off and has good alignment of discharged sheets can be obtained. The second stencil printing apparatus of the present invention provides a stencil printing apparatus that is capable of smoothly transporting printing paper without curling up of the printing paper onto the plate cylinder, and without paper feeding failures or paper ejection failures.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the arrangement of air blowing means used in a first stencil printing apparatus of the present invention.

FIG. 2 is a perspective view showing the air blowing port of the air blowing means of the present invention.

FIG. 3 is a perspective view showing the air outlet of the air blowing means of the present invention.

FIG. 4 is a sectional view showing the air blowing direction and printing paper conveyance direction of the air blowing means of the present invention.

FIG. 5 is a perspective view schematically illustrating a stencil printing apparatus used in Example 1 of the present invention.

FIG. 6 is an explanatory diagram illustrating the outline of a blowing means used in Example 2 of the present invention.

FIG. 7 is a perspective view illustrating the wire and slit portion of the second stencil device of the present invention.

FIG. 8 is a perspective view showing the relationship between printing paper and wires in the second stencil printing apparatus of the present invention.

FIG. 9 is a perspective view showing the relationship among the printing paper, wire, and plate cylinder in the second stencil printing apparatus of the present invention.

FIG. 10 is a sectional view showing a conventional stencil printing device.

[Explanation of symbols]

1 Reading section 2 Roll base paper 3 Perforation part 4 Cutter 5 Guide plate 6 Conveyance roller 7 Paper feed stand 8 Drive motor 9 Paper output tray 10 Press roller 11 Inking roller 12 Plate cylinder 13 Clamp part 14 Stopper 15,18　Blower device 16 Sensor 17 Printing paper guide plate 19 Cam 20 Piston 21 Cylinder 22 Wire 23 Slit a　Air outlet thickness b Angle formed by c and d c　Direction of wind traveling by the blower device d　Advancing direction of printing paper P Printing paper

Claims (2)

[Claims] Claims: 1. A stencil printing device in which printing is performed by pressing a printing paper into contact with a stencil cardboard wrapped around the outer periphery of a cylindrical plate cylinder by a press roller, comprising means for blowing air in the same direction as the conveyance direction of the printing paper. A stencil printing device characterized by: [Claim 2] In a stencil printing device in which printing is performed by pressing a printing paper into pressure contact with a stencil cardboard wrapped around the outer periphery of a cylindrical plate cylinder by a press roller, the printing paper is transferred from both ends of the paper feed table to both ends of the plate cylinder. A stencil printing device characterized in that a wire is stretched through a provided slit and extends to both ends of a paper ejection table at a position where both ends of the printing paper can come into contact with each other.