JPH0419956B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a stencil printer that can easily print using a stencil printing original plate.

(Prior Art) Various types of stencil printers of this type have been proposed, but if the stencil printing original plate is held loosely, the patterns of characters, figures, etc. to be printed during printing may be deformed, resulting in printing as desired. Since it is not possible to print on paper, it is necessary to hold the stencil printing plate under tension.

In the printing method known as silk screen, a stencil printing original plate is stretched around a frame made of metal, wood, etc. under tension. This is very expensive as the screen is attached to a rigid frame.
It is unsuitable for disposable frames such as those used in simple stencil printers.

Among the methods for simple printing, one is used in which a stencil printing plate is adhered flatly to a rectangular paper frame so as not to wrinkle. Since the frame is made of paper, it expands and contracts due to the influence of moisture contained in the air, and the flatness of the stencil printing original plate is relatively maintained during the dry period. However, when used in humid seasons or on the other hand, the stencil printing original plate wrinkles, causing the print quality to not be as desired or misaligned, which is the biggest cause of deterioration.

Almost the same problem may occur in a stencil printing original plate in which perforation is performed by washing with water, as in the method for making a stencil printing original plate (Japanese Patent Laid-Open No. 59-67051) filed by the present applicant.

In printing using a water-soluble printing ink on a stencil printing original plate that has been perforated by a heat-sensitive method or the above-mentioned plate-making method,
Printing ink adhering to the stencil printing original plate can be removed by washing with water. Therefore, the color of the printing ink can be changed, and after printing is completed, the printing ink can be removed and the stencil printing original plate can be stored in a ready-to-use state. When used in this manner, the stencil printing original plate with a general frame will wrinkle due to expansion and contraction of the frame or the stencil printing original plate itself. Even in printing using oil-based printing ink, almost the same problem often occurs in the stencil printing original plate after cleaning with an organic solvent or the like.

Relatively high viscosity printing ink is placed on a stencil printing original plate that is attached to a flat paper frame and perforated using a heat-sensitive method, and then a film-like flexible sheet that is impermeable to ink is placed on it. There are several simple stencil printers that print by applying pressure from above the sheet. In most of these, the frame is made of relatively rigid paper quality and dimensions in order to ensure the flatness of the stencil printing original plate. In this case as well, the above-mentioned problems regarding the expansion and contraction of the frame are applicable.

Furthermore, the stencil printing original plate using such a frame has the following problems. In order to hold the stencil printing original plate in a flat plate shape, a part or all of the holding device provided on the printer has a shape that protrudes on substantially the same plane as the printing surface or the paper to be printed. Therefore, the size of the printing paper is limited to a size that does not come into contact with the printing paper. Therefore, for example, if a B6 size print is made on a B5 size printing paper, the frame or its holding device may come into contact with areas other than the printing surface, making printing impossible or causing the paper to become damaged. Parts of the paper to be printed other than the printed part may be damaged.

Even if the size of the paper to be printed is made small so that it does not come into contact with the frame or its holding device, the holding device will come into contact with the base, making printing impossible. Therefore, the pedestal must be set high enough to prevent part or all of the holding device from coming into contact with the base.

(Problems to be Solved by the Invention) The present invention improves the above-mentioned drawbacks, attaches the stencil printing original plate to the stencil printing original plate holder by applying tension, and eliminates restrictions on the size of the printing paper. The purpose is to be able to print as desired on any part of printing paper.

(Means for Solving the Problems) The present invention allows printing ink to pass through the stencil printing original plate held by the stencil printing original plate holder by contacting and separating the stencil printing original plate from the printing paper placed on the base. In a stencil printer that prints with a stencil, tension is applied to the printing surface of the stencil printing plate by bending it from the inside of reinforcing pieces fixed to at least two opposing edges of the stencil printing plate so that the printing surface of the stencil printing plate becomes substantially flat. This is a stencil printer in which holding means for attaching a stencil printing original plate is provided above the printing surface.

Furthermore, in a stencil printer that prints by bringing a stencil printing original held in a stencil printing original holder into contact with and separating from a printing paper placed on a base, and printing ink passing through the stencil printing original, the stencil printing original is used. A reinforcing piece fixed to at least two opposing edges of the plate is bent from the inside, and an elastic material is brought into contact with the inner surface of the folded part, and tension is applied to the printing surface of the stencil printing original plate so that the printing surface becomes almost flat. This is a stencil printer in which holding means for attaching a stencil printing original plate is provided above the printing surface.

In the embodiment described later, a hole is provided in the reinforcing piece fixed to at least two opposing edges of the stencil printing original plate, and a projection provided on the stencil printing original holder is engaged with the hole, so that the stencil printing original plate holder is The force due to minute elastic deformation and the force acting on the stencil printing plate form a tension that maintains the stencil printing plate substantially flat. Therefore, various means can be used for holding the stencil printing original plate, such as a structure that engages with the stencil printing original plate, a structure that clamps or presses the stencil printing original plate, and the like. Holding with adhesive tape or holding with clips can also be used as simple means.

(Function) The stencil printing original plate holder is provided with a holding means for a reinforcing piece that is fixed to at least two opposing edges of the stencil printing original plate and is bent from the inside to attach the stencil printing original plate. The stencil printing original plate is bent and attached from the inner side of the reinforcing piece, which is the printing surface part, so that tension is applied to the printing surface, and the printing surface becomes taut.

Furthermore, an elastic material is brought into contact with the inner surface of the folded portion of the printing surface of the stencil printing original plate. Further tension is applied to the stencil printing original plate by the pressing force of the elastic material, and the printing surface becomes further taut.

(Example) Embodiments of the invention are illustrated in the drawings.

In the embodiment shown in FIGS. 1 to 7, a wall 3 having a horizontal groove 2a and a vertical groove 2b on the inner surface is provided on two opposing sides of the base 1. A pin 7 fixed to a side piece 6 of a pressing lever 5 having a rectangular window 4 therein is inserted into the groove 2a, and the pressing lever 5 is horizontally movable and rotatable about the pin 7 as a fulcrum.

The stencil printing original plate holder 8 has the following configuration. The rectangular outer shape is slightly smaller than the window 4 of the pressing lever 5, and it has a rectangular window 9 inside, one opposing side piece 10 is provided with a spaced apart standing part 11, and the other opposing side piece 12 is provided with a spaced apart standing part 11 on the outer surface of the other opposing side piece 12. Spaced projections 13 are provided and an inclined stop surface 14 is provided internally.

The pressing body 15 has the following configuration. The stencil printing original plate holder has a rectangular outer shape that is almost the same as the window 9 of the stencil printing original plate holder 8, has a rectangular window 16 inside, and has an arcuate hole 18 in one opposing side piece 17. An upright portion 19 is provided which bulges outward and has a width that is approximately the same as the distance between the upright portions 11 of No.8. an inwardly inclined slope 2 on the outer surface of the other opposing side piece 20;
A pressing plate (preferably transparent) covering the window 16 is fixed to the bottom of the side pieces 17 and 20, and a pressing part 2 is provided.
It is listed as 2.

The plastic elastic body 23 consists of a mounting part 24 and an elliptical elastic part 25 having a flat surface at the bottom. , an elastic body 23 is attached.

The pressing body 15 is inserted into the window 4 of the stencil printing original plate holder 8, the standing part 19 is inserted between the standing parts 11, and the pin 27 as an elastic body pressing means is fixed to the side piece 6 of the pressing lever 5. , one end 27a thereof is inserted through the attachment part 24 of the elastic body 23 and inserted into the groove 28 on the outer surface of the side piece 10 of the stencil printing original plate holder 8, so that the stencil printing original plate holder 8 becomes swingable. Yes, pin 2
The other end 27b of 7 is made to protrude from the side piece 6 of the pressing lever 5.

The pin 29 as a means for pressing down the pressing body is
5 into the hole 18 of the standing portion 19 of the press lever 5.
The pressing body 15 is removably screwed to the protrusion 30 of the side piece 6, and the pressing body 15 is movable in the vertical direction with respect to the stencil printing original plate holder 8, and is swingable with respect to the pressing lever 5. . Slope 21 of pressing body 15
is separated from the stopper surface 14 of the stencil printing original plate holder 8, and the pressing portion 22 of the pressing body 15 is recessed into the stencil printing original plate holder 8. The amount of separation between the slope 21 and the stopper surface 14 is made slightly larger than the amount of retraction of the pressing portion 22.

When the press lever 5 is rotated from the chain line position in FIG.
After horizontally moving through the groove 2a and stopping, the end 27b of the pin 27 enters the groove 2b in the wall 3 of the base 1.
Further, when the pressing lever 5 is pressed downward, the pin 29 moves through the hole 18 of the upright portion 19 of the pressing body 15, and the pressing body 15 remains stationary relative to the stencil printing original plate holder 8 while making the stencil plate. It descends together with the printing original plate holder 8.

Rectangular stencil printing original plate 31 (Figures 6 and 7)
is slightly longer than the length of the stencil printing original plate holder 8 in the 10th direction of the side piece, and slightly shorter than the length of the 12th side piece of the stencil printing original plate holder 8;
Reinforcing pieces 33 are fixed to the surfaces of opposite ends 32 of the stencil printing original plate 31 in the direction of the side pieces 12. One end portion 35 of the sheet 34 is large enough to cover almost the entire surface of the stencil printing original plate 31 and is impermeable to printing ink.
It is fixed between the end portion 32 of the stencil printing original plate 31 and the reinforcing piece 33, and the reinforcing piece 33 and the stencil printing original plate 31 have the following properties:
A hole 33a and a hole 31a each having approximately the same size as the protrusion 13 of the stencil printing original plate holder 8 are provided.

At the time of printing, a stencil printing original plate 31 is covered with a sheet 34, in which patterns such as letters and figures are formed in advance by perforation, and printing ink is placed on the perforated portions. With the pressing lever 5 in the chain line position shown in FIG.
1 is attached to the stencil printing original plate holder 8. The stencil printing original plate 31 is pressed and stretched by the corners 12' of the side pieces 12, and tension is applied to the printing surface 31'. A paper 39 to be printed of a predetermined size is placed on the guide 40 of the base 1.
Place about 10 sheets on top of each other.

When the pressing lever 5 is placed in the solid line position shown in FIG. 2, the elastic portion 25 of the elastic body 23 comes into contact with the printing paper 39.
When the pressing lever 5 is pressed and lowered, the elastic portion 25 presses the printing paper 39 while being elastically deformed. Both the stencil printing original plate holder 8 and the pressing body 15 descend,
The stencil printing original plate 31 contacts the printing paper 39 almost parallel to the printing paper 39 . Attachment part 24 of elastic body 23
Since the end of the pin 27 is inserted into the mounting groove 26 of the side piece 10 of the stencil printing original plate holder 8, when the pressing lever 5 is pressed down, the pin 27 moves in the long groove 28 of the stencil printing original plate holder 8. , the elastic portion 25 is elastically deformed. This elastic deformation force presses and fixes the stencil printing original plate 31 against the printing paper 39.

During the operation until the stencil printing original plate 31 comes into contact with the printing paper 39, the elastic portion 25 is elastically deformed in response to the depression of the pressing lever 5. Since the mounting portion 24 is not elastically deformed, the relative positional relationship between the stencil printing original plate holder 8 and the pressing member 15 does not change, and no force is applied to press the printing ink. When the pressing lever 5 is subsequently pressed down, the pin 29 presses the lower edge of the hole 18 and presses down the pressing body 15, and the mounting portion 24 is elastically deformed.

The pressing portion 22 of the pressing body 15 presses the printing ink through the sheet 34, causes the printing ink to pass through the perforated portions of the stencil printing original plate 31, and adheres to the printing paper 39 for printing.

When the pressing lever 5 is raised, the elastic deformation of the attachment portion 24 and the elastic portion 25 of the elastic body 23 is restored, and the pressing body 15 that was pressing the printing ink is first raised. Next, while the printing paper 39 is pressed against the base 1 by the recovery force of the elastic deformation of the elastic portion 25, the stencil printing original plate 31 is separated from the printing paper 39 by the reaction force. Since the recovery force of the elastic portion 25 of the elastic body 23 is much greater than the adhesive force of the printing ink in the printed portion, the stencil printing original plate 31 is easily separated from the printing paper 39.

Printed paper 39 printed by the elastic part 25 of the elastic body 23
After separating the printing paper 39 from the printing paper 39, the printing paper 39 is removed. The above operations are repeated to print on the printing paper 39.

When separating the stencil printing original plate 31 and the printing paper 39,
When the stencil printing original plate 31 slides and separates from the printing paper 39, printing misalignment occurs. Since the contact portion of the resilient portion 25 of the elastic body 23 with the printing paper 39 is flat, the stencil printing original plate 31 can be separated from the printing paper 39 while keeping it substantially parallel to the printing paper 39, which has a remarkable effect of preventing printing misalignment.

When separating the stencil printing original plate 31 from the printing paper 39, the elastic body 23 is attached to the elastic part 25 so that the printing paper 39 does not slip on the contact surface with the elastic part 25 due to the adhesive force of the printing ink in the printing part. It is preferable to attach a material having a large coefficient of friction (for example, rubber) to the contact area with the printing paper 39.

When printing with a squeegee instead of printing by pressing the pressing part 22 of the pressing body 15, the following procedure is performed.

The pin 29 is removed from the protrusion 30 of the pressing lever 5, and the pressing body 15 is removed. Remove the sheet 34,
The stencil printing original plate 31 formed by perforating a pattern as described above is attached to the stencil printing original plate holder 8. The pressing lever 5 is lowered in the same manner as in the printing described above to bring the stencil printing original plate 31 into contact with the printing paper 39,
By placing printing ink on the stencil printing original plate 31 and squeezing it with a squeegee (not shown), the printing ink passes through the perforated portions and adheres to the printing paper 39 for printing. The press lever 5 is raised to separate the elastic part 25 of the elastic body 23 from the printed paper 39, and the printed paper 39 is taken out. The above operations are repeated to print on the printing paper 39.

The embodiments shown in FIGS. 8 to 10 have almost the same construction as the previous embodiments, except that the holes 18 in the upright portion 19 of the pressing body 15 are not provided and the pins 29 are not used. The elastic body pressing means and the elastic body pressing means are constructed as follows. The pin 41 is inserted through the pin 27 of the stencil printing master holder 8 and the side surface 17 of the pressing body 15 and fixed to the side piece 6 of the pressing lever 5. The end 41a of the pin 41 protrudes from the side piece 6, It has the same effect as the end 27b. In the side part 10 of the stencil printing original plate holder 8, a long hole 42 containing a pin 41 is inserted into the side piece 1 of the pressing body 15.
Since the pin 41 is inserted into the hole 42, even after the stencil printing original plate 31 overlaps the printing paper 39, the pressing body 15 descends in response to the pressing of the pressing lever 5. The pin 41 of the window 9 portion of the pressing body 15 does not need to be composed of one pin, and may be replaced with two pins by removing the central portion.

During printing, the stencil printing original plate 31 loaded with printing ink is attached to the stencil printing original plate holder 8, the printing paper 39 is stacked on the base 1, and the elastic body 23 is The portion 25 is brought into contact with the printing paper 39, and the pressing lever 5 is pressed downward. The stencil printing original plate holder 8 and the pressing body 15 descend, and the stencil printing original plate 31 comes into contact with the printing paper 39. Thereafter, the pressing part 22 of the pressing body 15 presses the printing ink through the sheet 34 and presses the printing ink onto the printing paper. Print on 39. The above operations are repeated to print on the printing paper 39.

11 and 12 instead of the elastic body 23
As shown in the figure, the plastic elastic bodies 23 ₁ and 23 ₂ can be comprised of attachment parts 24 ₁ and 24 ₂ and elastic parts 25 ₁ and 25 ₂ , respectively. Alternatively, as shown in FIG. 13, the elastic body 23 ₃ can be composed of a plastic mounting portion 24 ₃ and a metal elastic portion 25 ₃ .

The stencil printing original plate holder 8 and the pressing body 15 can also be configured as follows. By removing the former standing portion 11 and the latter standing portion 19, FIGS.
As shown in FIG. 5, the side piece 10 of the stencil printing original plate holder 8
A vertical convex portion 10' is provided on the inner surface of the pressing body 15, a perpendicular concave portion 17' is provided on the outer surface of the side piece 17 of the pressing body 15, and the convex portion 10' is inserted into the concave portion 17'. It is attached to the holding body 8 so as to be movable in the vertical direction.

In the embodiment shown in FIG. 16, the stencil printing original plate holder 8
is constructed almost the same as the previous embodiment. Elastic material 42 is provided at a location corresponding to the corner 12' of the side piece 12.
is fixed. As in the previous embodiment, when the stencil printing original plate 31 is attached to the stencil printing original plate holder 8, the stencil printing original plate 31 is pressed by the elastic material 42 and the printing surface 31' becomes stretched.

(Effects of the invention) The present invention can be applied to various stencil printers, and the stencil printing original plate remains stretched during printing, allowing for the desired minute printing, and affecting the size of the paper to be printed. This has the advantage that it is possible to print on a part of the paper to be printed without being affected.

[Brief explanation of drawings]

FIG. 1 is a plan view of a stencil printer according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a side view of the stencil printer, and FIG. 4- in Figure 1
FIG. 5 is a bottom view of the stencil printing original plate holder, FIGS. 6 and 7 are respectively a plan view and a side view of the stencil printing original plate, and FIG. 8 is a diagram showing another embodiment of the present invention. Top view of the stencil printer, Figures 9 and 1
Figure 0 corresponds to lines 9-9 and 10-1 in Figure 8, respectively.
11 to 13 are side views of elastic bodies of different embodiments, and FIGS. 14 and 15 are cross-sectional views taken along line 0.
The figures are a plan view and a side view of a stencil printing original plate holder with a built-in pressing body, respectively, and FIG. 16 is a sectional view of a stencil printing original plate holder with a built-in pressing body according to another embodiment. 1... Base, 8... Stencil printing plate holder, 13
... Holding means (protrusion), 15 ... Pressing body, 23,
23 ₁ , 23 ₂ , 23 ₃ ... elastic body, 31 ... stencil printing original plate, 31' ... printing surface, 31a, 33a ...
... Hole, 33 ... Reinforcement piece, 39 ... Printing paper, 42
...Elastic material.

Claims (1)

[Scope of Claims] 1. Stencil printing in which a stencil printing original plate attached to a stencil printing original plate holder is brought into contact with and separated from a printing paper placed on a base, and printing ink is passed through the stencil printing original plate to perform printing. In the machine, reinforcing pieces fixed to at least two opposing edges of the stencil printing original plate are bent from the inside to apply tension to the printing surface of the stencil printing original plate so that the printing surface becomes substantially flat. A stencil printer, in which a holding means for attaching an original is provided above the printing surface. 2. In a stencil printer that prints by bringing a stencil printing original plate attached to a stencil printing original plate holder into contact with and separating from a printing paper placed on a base, and printing ink passing through the stencil printing original plate, the stencil printing machine A reinforcing piece fixed to at least two opposing edges of the original plate is bent from the inside, and an elastic material is brought into contact with the inner surface of the bent portion, so that the printing surface of the stencil printing original plate is approximately flat. A stencil printer, comprising a holding means for applying tension and attaching the stencil printing original plate above the printing surface.