JP2991803B2 - 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 utilizing the principle of stencil printing.

[0002]

2. Description of the Related Art An ink-filled flat plate is provided between a stencil sheet and a sheet impermeable to printing ink, and the stencil side of the stencil and the printing paper are pressed. 2. Description of the Related Art A stencil printing apparatus that performs printing by printing is known. According to this type of flat printing press type simple printing apparatus, since only pressure in the surface direction is applied to the original during printing, a plurality of colors of ink are filled in the original according to the position of the stencil image. Thus, multicolor printing can be performed with a single pressing operation.

Further, there is also known a rotary press in which printing is performed by winding the stencil sheet having been made as described above around the outer peripheral surface of the drum and rotating the drum in synchronization with the supply of the printing paper. ing. According to this type of printing press, there is an advantage that the printing speed is high and the labor of the operation is small.

[0004]

According to the stencil printing apparatus of the flat press-press type described above, it is necessary to perform an operation of pressing the original plate for each sheet of the printing paper, which is troublesome and reduces the printing speed. There were difficulties.

According to the rotary printing press described above, it is difficult to perform multicolor printing in one printing operation, and there is a problem that the mechanism is complicated and the cost is high.

An object of the present invention is to provide a stencil printing apparatus that makes use of the advantages of both the press printing type stencil printing apparatus and the rotary printing press described above. That is, an object of the present invention is to provide a stencil printing apparatus capable of performing continuous printing of multiple colors at a time with a simple structure.

[0007]

According to the present invention, there is provided a stencil printing machine comprising: a stencil printing plate in which ink is filled between a stencil printing plate and a printing ink impervious sheet; A rotatable drum mounted on an endless belt driven in surface contact with a part of the outer peripheral surface of the drum,
A pressurizing means for applying pressure to the entire surface of the printing paper sandwiched between the stencil printing plate and the endless belt;

[0008]

When the printing paper is inserted between the drum and the endless belt driven in synchronization, the printing paper is drawn between the two and comes into close contact with the stencil printing plate mounted on the drum. Here, the pressurizing means acts, and the printing paper is pressed on the entire surface of the stencil printing plate by applying pressure to the entire surface to perform printing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. The stencil printing apparatus according to the present embodiment shown in FIG. 1 includes a paper feeding unit 2, a printing unit 3, and a paper discharging unit 4.

The paper supply unit 2 includes a swingable paper supply table 5 whose base end is supported by a pivot, and a spring 6 provided on the lower surface side of the distal end of the paper supply table 5 to push up the paper supply table 5. And Further, a separating roller 7 is provided above the leading end of the paper feed table 5 so that the paper to be printed on the paper feed table 5 can be sent rightward in the drawing. A guide plate 8 for guiding the printing paper sent out by the separating roller 7 is provided next to the leading end of the paper feeding table 5.
Is provided.

According to the sheet feeding section 2 of the present embodiment, the spring 6
Due to the deflection, there is a margin between the sheet feeding table 5 and the separating roller 7 for setting a maximum of 100 postcards.

In FIG. 1, the printing unit 3 on the right of the paper feeding unit 2 has a plate mounting drum 9 and a pressure belt 10 as an endless belt. Plate mounting drum 9 (hereinafter, drum 9
Call. ) Is cylindrical and is rotatable about a central axis 11. A part of the outer peripheral surface is provided with a sponge setting unit 12 for setting a stencil printing plate,
On both sides of the setting unit 12 in the circumferential direction, clamp devices 13 for fixing both ends of the stencil printing plate are provided. The clamp device 13 has a swingable clamp plate 14 and a magnet 15 for fixing the clamp plate 14.

FIG. 2 shows a stencil printing original plate 16 mounted on the drum 9. The setting unit 12 of the drum 9
The stencil printing original plate 16 (hereinafter, referred to as the original plate 16) provided in the stencil printing machine is hereinafter described. )). Base paper 1 exposed on the outer surface
8 is made in advance, and one or more types of printing ink 19 (hereinafter, referred to as ink) are filled between the base paper 18 and the sheet 17.

As shown in FIG. 1, an introduction roller 20 is provided adjacent to the right side of the guide plate 8 and close to the drum 9. A discharge roller 21 is provided at a position symmetrical to the introduction roller 20 with respect to the center axis 11 of the drum 9. A tension roller 22 is provided at a position distant to the right of the drum 9 and at an equal distance from the introduction roller 20 and the discharge roller 21.

[0015] As shown in FIG.
The pressure belt 10 which is an endless belt is wound around the discharge roller 21 and the tension roller 22. A part of the pressure belt 10 is wound around a half of the drum 9 between the introduction roller 20 and the discharge roller 21. That is, the pressure belt 10 comes into surface contact with the outer peripheral surface of the right half of the drum 9 which is the half part on the tension roller 22 side.

An output shaft of a motor (not shown) is linked to a drive shaft 23 of the discharge roller 21. If this motor is rotated forward, the pressure belt 10 moves in the direction of the arrow in the figure. At this time, since the drum 9 rotates in the clockwise direction in the drawing, the pressure belt 10 and the drum 9 are rotated.
If the printing paper is inserted from the paper feed unit 2 during the printing, the printing paper is transported sandwiched between the two.

As shown in FIGS. 1 and 3, the tension roller 22 is movable in the left-right direction in FIG.
The distance from the drum 9 can be adjusted. A cam 25 is provided in the vicinity of the rotation shaft 24 of the tension roller 22, and the output shaft of the above-mentioned motor (not shown) is linked to the shaft 26 of the cam 25. When the motor is rotated in the reverse direction, the cam 25 rotates in a predetermined direction to push the rotating shaft 24 of the tension roller 22 to move the tension roller 22 away from the drum 9. As a result, the tension of the pressure belt 10 increases, and the contact pressure of the pressure belt 10 that is in surface contact with the outer peripheral surface of the drum 9 increases. That is, in the present embodiment, the tension roller 22 serves as a pressing unit.

The pressure belt 10 has a two-layer structure as shown in FIG. The inside that comes into contact with the drum 9 or the printing paper is made of a flexible material 30 such as rubber having a large coefficient of friction, and the outside is an elastic material 31 such as a sponge that easily absorbs pressure.
Consists of

As shown in FIG. 1, a paper discharge section 4 provided below the paper supply section 2 is provided with a paper discharge guide 40 for guiding a printing paper discharged from a drum 9 and a pressure belt 10 to the discharge section. It is provided next to the unit roller 21. A paper stocker 41 (hereinafter, referred to as a stocker 41) as a main body of the paper discharge unit 4 is provided next to the paper discharge guide 40.

As shown in FIGS. 5 and 6, this stocker 41 has a plurality of rectangular interleaf papers 42 having good ink absorbency, and is provided between the lower ends of the interleaf papers 42, 42, respectively. The spacers 43 are overlapped with each other and are integrated. Each of the slip sheets 42 has a bent portion 44 near the spacer 43, and can swing around the bent portion 44. As shown in FIG. 6, a pair of feed spirals 45, 45 is provided on both sides of the stocker 41 at both ends in the axial direction of the drum 9. At both ends. That is, when the feed spiral 45 is driven, the interleaving papers 42 of the stocker 41 that are inclined at the folding part 44 are erected one by one, and the insertion slot 4 between the interleaving papers 42 is inserted.
6 can be sequentially spread, and the printed paper discharged from the drum 9 side is inserted between the slip sheets 42.
We can accept them one by one.

Next, the operation of the present embodiment will be described. The stencil printing plate 16 is set in the setting section 12 of the drum 9, and both ends thereof are fixed by the clamp device 13. The stencil sheet 16 of the stencil printing plate 16 is, of course, already made.
And the sheet 17 are filled with various types of printing inks according to the platemaking image. Next, the spring 6 is compressed to lower the sheet supply table 5, and a desired number of sheets to be printed are set on the sheet supply table 5. Then, the separating roller 7 is driven to print the paper to be printed on the printing unit 3.
The printing unit 3 drives the discharge unit roller 21 to drive the pressure belt 10 and the drum 9.

The printing paper inserted between the pressure belt 10 and the drum 9 is conveyed by being sandwiched between the drum 9 and the pressure belt 10 until the entire surface thereof coincides with the image surface of the original plate 16 of the drum 9. . The entirety of the printing paper is a pressure belt 10.
The drive of the pressure belt 10 is stopped when the printing paper and the original plate 16 come into surface contact with each other on the entire surface.

When the paper is conveyed between the pressure belt 10 and the drum 9 as described above, it is necessary to secure an appropriate frictional force to ensure the paper feeding.
At the same time, it is necessary to make the contact pressure such that the ink of the master 16 attached to the drum 9 is not squeezed and leaked or mixed. However, it is difficult to adjust the frictional force and the contact pressure.For example, if the pressure belt has a single-layer structure made of only rubber, the above adjustment cannot be performed well by simply changing the belt thickness, but the frictional force of the feed is sufficient. The contact pressure becomes large, causing problems such as ink leakage.
In the present embodiment, the inner surface side that comes into contact with the printing paper is
To secure the frictional force with the paper to be printed,
By setting it to 1, the contact pressure applied to the printing paper is absorbed. According to the present embodiment, since the pressure belt 10 is configured as described above, the contact pressure applied to the original plate 16 can be reduced to the extent that ink leakage or the like does not occur, and the frictional force can be increased. The printing paper can be transported very smoothly.

Now, between the pressure belt 10 and the drum 9, the printing paper and the original 16 coincide with each other over the entire surface.
Is stopped, the cam 25 is driven to move the tension roller 22 away from the drum 9. Thereby, the tension of the pressure belt 10 increases, and the pressure belt 10 wound around the drum 9 applies a uniform pressure to the entire surface of the printing paper. As a result, the printing paper becomes the original
And stencil printing is performed.

After the tension roller 22 returns to the original position, the pressure belt 10 and the drum 9 are driven again, and the printed printing paper is discharged to the paper discharge section 4 from between the drum 9 and the pressure belt 10. .

The discharged printing paper enters a stocker 41 via a discharge guide 40. The feed spiral 45 is driven in accordance with the discharge timing, and the interleaving paper 42 of the stocker 41 is
If the sheets are fed one by one, the printed sheets just printed can be received and stored one by one between the slip sheets 42 of the stocker 41. Therefore, the ink does not adhere to each other due to the contact between the printing papers, and the ink is not stained.

In one embodiment described above, the pressure belt 10
Is driven, and the drum 9 is driven by the pressure belt 10. However, both may be driven in synchronization with each other. Further, the movement of the tension roller 22 may be performed by a drive source different from the motor that drives the pressure belt 10.

Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals as those in FIG. 1, and the description is omitted.

As shown in FIG. 7, the drum 50 of this embodiment
Has a drive shaft 51 at a position off the center of the drum 50, and the drive shaft 51 rotates eccentrically by the rotation of the drive shaft 51. In addition, the introduction roller 52 and the discharge roller 53 around which the pressure belt 10 is looped are
A support shaft is inserted through 2a and 53a so as to be movable. Further, unlike the tension roller 22 of the first embodiment, the third roller 54 is rotatably provided at a predetermined position and cannot move.

In the above-described configuration, when the printing paper is sent out from the paper supply unit 2 and the drum 50 is rotated, the introduction roller 52 and the discharge roller 53 move following the eccentric rotation of the drum 50. The printing paper is drawn between the drum 50 and the pressure belt 10 that moves following the drum 50.

The printing paper is conveyed by the drum 50 and the pressure belt 10 while the original 16
And at the same time, the drum 50 is pressed by the eccentric rotation of the drum 50 and pressed against the pressure belt 10 side. The entire printing paper is made up of the pressure belt 10 and the drum 5.
When the printing paper and the original plate 16 are brought into surface contact with each other on the entire surface, the pressure applied to the printing paper by the drum 50 is maximized, and stencil printing is performed.

As described above, in the present embodiment, the drum 50 that rotates eccentrically conveys the printing paper, and further applies pressure to the entire surface as a pressing means. That is, the printing paper is conveyed by the drum 50 and the pressure belt 10, and the maximum pressing force is applied to the printing paper when the printing paper reaches a predetermined printing position.
Is performed in conjunction with the continuous operation of.

Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals as those in FIG. 1, and the description is omitted.

The stencil printing apparatus shown in FIG. 8 is obtained by adding a function as a stencil making apparatus to the first embodiment. That is, a flash valve 61 and a reflection plate 62 are provided inside the drum 60, and the flash valve 61 is provided inside the setting unit 12.
The transparent part 63 is provided so as to face. At the time of plate making, the base paper 18 is set in the transparent section 63, and an original is placed thereon. When the apparatus is driven in this state, the setting unit 12 applies pressure at the printing position described in the first embodiment,
The base paper 18 and the original are pressed against the transparent portion 63 in close contact with each other.
If the flash valve 61 is energized to generate flash light, a perforated image corresponding to the image of the original is formed on the base paper 18.

[0035]

According to the present invention, the drum on which the stencil printing plate is mounted is brought into surface contact with the endless belt, and the two are synchronously driven to nip and convey the printing paper and convey it to a predetermined position. By the way, since printing is performed by applying pressure to the entire surface of the printing paper, it is possible to continuously perform stencil printing using multicolored ink.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a partially enlarged sectional view of the drum of the first embodiment.

FIG. 3 is a view showing a tension roller moving mechanism according to the first embodiment.

FIG. 4 is a cross-sectional view of the pressure belt of the first embodiment.

FIG. 5 is a partially enlarged sectional view of the stocker of the first embodiment.

FIG. 6 is a perspective view of the stocker according to the first embodiment.

FIG. 7 is a sectional view of a second embodiment.

FIG. 8 is a sectional view of a third embodiment.

[Explanation of symbols]

1 stencil printing machine, 9,60 plate mounting drum (drum), 10 pressure belt as endless belt, 16 stencil printing master (stencil), 17 ink impermeable sheet (sheet), 18 stencil printing stencil (base paper) , 22 tension roller as pressure means, 50 drum as pressure means.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B41L 13/18 B41L 13/18 M

Claims (1)

(57) [Claims] 1. A stencil printing plate in which ink is filled between a stencil printing plate and a printing ink impervious sheet, a rotatable drum on which the plate is mounted on a part of an outer peripheral surface,
An endless belt driven in surface contact with a part of the outer peripheral surface of the drum; and a pressurizing means for applying pressure to the entire surface of the printing paper sandwiched between the stencil printing plate and the endless belt. Stencil printing machine.