JPH0420399B2 - - Google Patents

Description

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

(Prior Art and Problems) Conventionally, this type of stencil printer has been used to apply relatively high viscosity ink between a stencil printing original plate formed by perforating the pattern to be printed and a thin sheet that is impermeable to ink. In many cases, the stencil printing original plate is attached to a press lever rotatably attached to a base, and the stencil printing original plate is pressed and brought into contact with the printing paper placed on the base to perform printing. With this stencil printer, the more sheets of paper to be printed are stacked on the base, the more the printing position shifts toward the fulcrum of the pressure lever, so the printing position of each sheet is different, making it possible to print in multiple colors. Therefore, it has been impossible to prevent color misregistration when printing is performed in several batches.

In order to improve this drawback, a method has been proposed in which printing is performed by lowering the stencil printing original plate parallel to the paper to be printed and bringing it into contact with the paper. However, when the entire stencil printing original plate does not touch the paper to be printed in parallel, after a part of the stencil printing original comes into contact with the paper to be printed, the entire stencil printing original gradually becomes parallel to the paper to be printed. There is a drawback that a part of the stencil printing original plate rubs against the printing paper, causing printing misalignment, making it impossible to print clearly.

(Object of the Invention) The present invention aims to improve this drawback by bringing the entire stencil printing original plate close to the base in the vicinity of the printing paper in a parallel or almost parallel state, and bringing it into contact with the base after printing.
Even when the stencil printing original plate is separated from the printing paper, the printing paper and the stencil printing original plate are gradually separated from each other until they are completely separated, while remaining parallel or almost parallel to the base. The first purpose is to prevent printing misalignment as described above.

The first objective is to prevent printing misalignment caused by partial abrasion between the stencil printing original plate and the printing paper, which occurs when the stencil printing original plate and the printing paper are separated after printing, as in conventional stencil printers. 2 objectives.

(Structure of the Invention) The present invention includes a stencil printing original plate holder holding a stencil printing original plate attached to a pressing lever, a pressing body movably attached to the stencil printing original plate holder, and a stencil printing original plate held by operating the pressing lever. In a stencil printer that prints by contacting and separating from a printing paper placed on a base, there is a loop-shaped first bullet part that contacts the printing paper, and an outer part in the center of the first bullet part. It consists of a narrow mounting part protruding from the mounting part, and a second elastic part protruding from both sides of the mounting part facing away from each other, and both ends of the second elastic part can be moved to the stencil printing plate holder. This is an elastic body that is inserted into the mounting portion and has a pin inserted through the side piece of the pressing lever, the elongated hole of the side piece of the stencil printing plate holder, and the side piece of the pressing body.

A feature of the elastic body of the present invention is that the first elastic part and the second elastic part are deformed independently. That is,
When the first bullet part is brought into contact with the base or the paper to be printed on the base and pressurized, the first bullet part elastically deforms while the second bullet part remains parallel to the base, and the second bullet part elastically deforms. The printing original plate holder attached near the end of the bullet can approach the printing paper while remaining parallel to the base until it comes into contact with the printing paper. Therefore, the stencil printing original plate contacts the printing paper while remaining parallel or substantially parallel to the printing paper, so that clear printing can be performed without the above-mentioned printing misalignment. Similarly, when the stencil printing original plate is separated from the printing paper, the stencil printing original plate is separated while remaining parallel or almost parallel to the printing paper, and no printing deviation occurs after printing.

The attachment portion, the first elastic portion, and the second elastic portion may be integrally molded from the same type of material, or may be a combination of different types of materials. The shape of the first bullet part can be circular, oval, etc. In particular, the first bullet part is approximately oval,
By increasing the rigidity of the portion that intersects with one of the center lines, that is, the short axis, and decreasing the rigidity of the portion that intersects with the other center line, that is, the long axis, the first elastic portion can be better bent.

When the first bullet part is brought into contact with the base, it is necessary to provide other means for fixing the printing paper. When the first bullet is in contact with the paper to be printed, no fixing means is required, and the paper to be printed can be fixed until printing is completed, and after printing, the bullet is separated from the paper to be printed. Paper can be easily taken out.

(Embodiments of the Invention) Examples of a stencil printer using the elastic body of the present invention will be described with reference to FIGS. 1 to 8.

A wall 3 having a horizontal groove 2a and a vertical groove 2b spaced apart from each other 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 square window 4 inside is inserted into the groove 2a, so that the pressing lever 5 can be horizontally moved and rotated about the pin 7 as a fulcrum.

The stencil printing original plate holder 8 has the following structure. The rectangular outer shape is slightly smaller than the window 4 of the pressing lever 5, and has a rectangular window 9 inside, a protrusion 11 is provided on the inner wall of one opposing side piece 10, and a protrusion 11 is provided on the inner wall of the other opposing side piece 12. Spaced projections 13 are provided on the outer surface, and an inclined stopper surface 14 is provided on the inner surface.

The pressing body 15 has the following structure. bottom 16
, the outer shape of the square is almost the same as the window 9 of the stencil printing original plate holder 8, and the inside has a square window 17,
One opposing side piece 18 is provided with a recess 19 corresponding to the stencil printing original plate holder 8 and the projection 11 .
The other opposing side piece 20 is provided with an inwardly inclined slope 21 on its outer surface.

The plastic elastic body 22 (FIG. 4) has the following structure. The first elastic part 23 is a bilaterally symmetrical oval shape, and the part 24 that intersects with the short axis is thickened to increase rigidity, and the part 25 that intersects with the long axis is made thinner to reduce rigidity. The elastic portion 26 is a symmetrical horizontal piece, and its center portion and the portion 24 of the first elastic portion 23 are connected by an attachment portion 27.

The pressing body 15 is inserted into the window 9 of the stencil printing original plate holder 8, the convex part 11 is inserted into the recessed part 19, and the first part of the elastic body 22 is inserted between the protrusions 28 and 29 of the side piece 10 of the stencil printing original plate holder 8. The end portion 30 of the second elastic portion 26 is inserted. Press the pin 31 with the side piece 6 of the lever 5 and the elastic body 2
2 mounting part 27, side piece 1 of the stencil printing original plate holder 8
Insert the long hole 32 in the vertical direction provided in the center of 0,
The end 31a of the pin 31 is loosely fitted into the hole in the side piece 18 of the pressing body 15, so that the stencil printing original plate holder 8 can swing, and the end 31b of the pin 31 is fitted into the hole in the side piece 6 of the pressing lever 5. more prominent.

When the pressing lever 5 is rotated from the chain line position to the solid line position in FIG.
enters the groove 2b.

The slope 21 of the pressing body 15 and the stencil printing original plate holder 8
The amount of separation from the stopper surface 14 is slightly larger than the amount of retraction of the bottom portion 16 of the pressing body 15.

Rectangular stencil printing original plate 33 (Figures 7 and 8)
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;
A reinforcing piece 35 is fixed to the surface of the opposite end 34 of the stencil printing original plate 33 in the direction of the side piece 12, and one end of a sheet 36 impermeable to printing ink is sized to cover almost the entire stencil printing original plate 33. The portion 37 is fixed between the end portion 34 of the stencil printing original plate 33 and the reinforcing piece 35, and the reinforcing piece 35 and the stencil printing original plate 33 have holes of approximately the same size as the projections 13 of the stencil printing original plate holder 8. 35a, 35a are provided.

At the time of printing, printing ink is applied to the perforated portions of the stencil printing original plate 33, which are formed by perforating patterns such as characters and figures, and the stencil printing original plate 33 is covered with a sheet 36. Push lever 5 to end 5
a to the stopper 38 of the base 1 (the chain line position in FIG. 2), and insert the protrusions 13 into the holes 33a and 35a of the stencil printing original plate 33 and the reinforcing piece 35, so that the stencil printing original plate 33 is attached to the stencil printing original plate. Attach to the holding body 8. About 10 sheets of printing paper 39 of a predetermined size are stacked and placed in the guide 40 of the base 1.

When the pressing lever 5 is positioned at the solid line position in FIG.
and press it against the base 1. When the pressing lever 5 is further pressed downward, the stencil printing original plate holder 8 and the pressing body 15 both descend, and the first elastic portion 23 is elastically deformed to bring the stencil printing original plate 33 into contact with the printing paper 39 and press it. During the operation until the stencil printing original plate 33 comes into contact with the printing paper 39, the first elastic portion 23 changes elastically in accordance with the depression of the pressing lever 5, but the second elastic portion 26 hardly deforms. Therefore, the stencil printing holder 8 and the pressing body 1
5 does not change, and no force is applied to pressurize the printing ink. Subsequent pressing lever 5
By pressing down, the pin 31 moves in the long groove 32 of the stencil printing master holder 8, and the pin 31 moves into the pressing body 15.
is pressed down, whereby the bottom 16 of the pressing body 15 presses the printing ink through the sheet 36, causing the printing ink to pass through the perforated portion of the stencil printing original plate 33 and adhere to the printing paper 39 for printing.

When the pressing lever 5 is raised, the first elastic portion 23
Then, the second elastic portion 26 recovers from its elastic deformation, the pressing body 15 rises, and the pressing force applied to the ink on the sheet 36 decreases. Since the stencil printing original plate holder 8 does not rise, the stencil printing original plate 3
3 presses the pressing body 15 while being pressed against the printing paper 39.
rises. The pin 31 collides with the upper end of the long hole 32 of the stencil printing original plate holder 8, and the relative movement between the pressing body 15 and the stencil printing original plate holder 8 stops, and the relative position of the stencil printing original plate holder 8 and the pressing body 15 is changed. The state is before printing. Through the operations so far, the second elastic part 26 of the elastic body 22 returns to its original state, but the first elastic part 23 still recovers elastically, so the stencil printing master holder 8
Both the pressing body 15 and the pressing body 15 begin to rise. After the stencil printing original plate 33 begins to separate from the printing paper 39 and is completely separated from the printing paper 39, the first bullet part 23 separates from the printing paper 39 and takes out the printed printing paper 39.
The above operations are repeated to print on the printing paper 39.

Instead of the elastic body 22, the elastic body 22 ₁ of FIG.
The elastic body 22 ₂ shown in FIG. 10 can be used. The plastic elastic body 22 ₁ has a symmetrical oval part 23' 1 with a thinner part 25 ₁ where the first elastic part 23 intersects with the long axis, and a symmetrical contact piece 23 provided at the bottom of the oval part 23' ₁ . _The second elastic portion 26 ₁ is a symmetrical horizontal piece, and the portion 24 1 where its center intersects with the short axis of the elliptical portion 23 _{′ 1} of the first elastic portion 23 ₁ is the mounting portion 2 .
Continued by 7 ₁ . Since the contact piece 23'' ₁ has a shape that protrudes symmetrically from the bottom of the oval portion 23' ₁ , the force that separates the stencil printing original plate 33 from the printing paper 39 after printing is large, especially when the printing paper 39 is separated from the printing paper 39.
When the printing paper 39 is thin or made of paper with low rigidity, the printing paper 39 can be separated from the stencil printing original plate 33 without causing any printing misalignment.
When the contact piece _23''1 is made of a thin material, it can be curved upward in a convex manner to exert effective elasticity.

The elastic body 22 ₂ is a second elastic part 2 made of plastic.
6 ₂ is bilaterally symmetrical and has a mounting portion 27 ₂ in the center, and the metal first elastic portion 23 ₂ is bilaterally symmetrical and has both ends inserted into the mounting portion 27 ₂ . In this case as well, a metal or plastic contact piece, such as the contact piece 23'' ₁ of the elastic body 22 ₁ , can be attached by screwing, heat welding, or other means, and has the same effect as the contact piece 23'' _1. Able to demonstrate

(Effects of the Invention) The elastic body of the present invention allows the first resilient part to lower the stencil printing original plate from almost directly above the printing paper, bring it into contact with it, and then separate it from the paper. When used in a stencil printer that has a structure in which the printing paper is pressed against the base using the bottom of the bullet or a contact piece, printing can be performed with many sheets of printing paper stacked one on top of the other.
In addition, after printing, the stencil printing original plate and the printed printing paper can be separated without causing printing misalignment by simply lifting the pressure lever, and clear printing can be achieved.

[Brief explanation of drawings]

FIG. 1 is a plan view of a stencil printer using an elastic body according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIG. 3 is a side view of the stencil printer. , 4th
The figure is a sectional view taken along line 4-4 in Figure 1, Figures 5 and 6 are a side view and bottom view of the stencil printing original plate holder, respectively, and Figures 7 and 8 are plan views of the stencil printing original plate, respectively. and side view, Figures 9 and 1
FIG. 0 is a front view of an elastic body according to another embodiment of the present invention. 1... Base, 5... Pressing lever, 8... Stencil printing original plate holder, 15... Pressing body, 22, 22 ₁ ,
22 ₂ ... elastic body, 23, 23 ₁ , 23 ₂ ... first
Bullet part, 26, 26 ₁ , 26 ₂ ... Second bullet part, 2
7, 27 ₁ , 27 ₂ ... Mounting part, 31 ... Pin, 3
2...Long hole, 33...Stencil printing original plate, 39...Printing paper, 23 ₁ ''...Contact piece.

Claims (1)

[Scope of Claims] 1. A stencil printing original plate holder holding a stencil printing original plate is attached to a pressing lever, a pressing body is movably attached to the stencil printing original plate holder, and the pressing lever is operated to perform the stencil printing. In a stencil printer that prints by bringing an original into contact with and separating from a printing paper placed on a base, a loop-shaped first bullet part that contacts the printing paper, and a central part of the first bullet part. It consists of a narrow mounting part protruding outward from the mounting part, and a second elastic part protruding from both sides of the mounting part facing away from each other, and both ends of the second elastic part are connected to the stencil printing. a vertical elongated hole in a side piece of the pressing lever and a side piece of the stencil printing original plate holder, movably inserted into the original plate holder;
and an elastic body in which a pin inserted through a side piece of the pressing body is inserted into the attachment part. 2. The first elastic part has an oval shape, and the rigidity of the part intersecting with the short axis, which is one center line, is increased, and the rigidity of the part, which intersects with the long axis, which is the other center line, is small. The elastic body according to scope 1. 3. The elastic body according to claim 1, wherein the first elastic part has an oval shape, and the first elastic part and the attachment part are made of a combination of different materials. 4. Claims 1, 2, or 3, wherein the first bullet part is provided with a contact piece that contacts the base or the printing paper on the opposite side of the second bullet part. Elastic body as described.