JPH02245373A - Plate cylinder and multi-color stencil printer - Google Patents

Abstract

PURPOSE:To make it possible to apply various color inks one over the other to perform full-color printing by providing partition walls with faces stretching in a direction in parallel with a direction in which a centrally axial line extends for dividing the interior of a cabinet into ink storage chambers around the centrally axial line. CONSTITUTION:Partition wells 5A, 5B, 5C are provided in a plate cylinder 2, and these walls have faces which stretch in a direction in parallel with a direction in which a centrally axial line extends, and also stretch in a radial direction centered around the centrally axial line for dividing the interior of the plate cylinder 2 into ink storage chambers 4A, 4B, 4C as well as a void space around the line. In addition, a recessed part for mounting an ink container 6 is provided in the center of the plate cylinder 2, and an orange ink container 7A, a green ink container 7B and a black ink container 7C are insetted. These color inks are selectively used in a direction which crosses a paper feed direction by rotating the plate cylinder fully once. Furthermore, if a single paper 50 is caused to come in contact with the periphery of ink storage chambers 4A to 4C containing different colors respectively before the full rotation of the plate cylinder 2, full-color printing can be performed by applying different color inks one over the other.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention provides a plate cylinder for multicolor printing, which has a partition wall fixedly installed therein to divide the periphery of the central axis into a plurality of ink storage chambers;
The present invention relates to a multicolor stencil printing device equipped with the plate cylinder.

(B) Prior Art As previously filed by the applicant of the present application, a conventional plate cylinder for multicolor printing has a plurality of A plurality of partition walls each having a surface extending along and intersecting the direction of the central axis are provided to divide the ink storage chamber into ink storage chambers (see Japanese Patent Application No. 111246/1988).

In the plate cylinder, inks of different colors can be stored along the extending direction of the central axis. Therefore, by just rotating the plate cylinder once, the same color is printed on the printing paper in the direction parallel to the paper feeding direction. A color-coded multicolor print is formed in such a way that the sections extend. Therefore, multicolor printing can be easily performed, but
It was not possible to perform full-color printing by color-coding in a direction crossing the paper feeding direction or by overlapping multiple colors of printing ink.

(C) Problems to be Solved by the Invention As mentioned above, conventional plate cylinders have the advantage of being able to easily perform multicolor printing, but they do not require color coding in the direction that intersects the paper feeding direction, or printing in multiple colors. It was not possible to print in full color by overlapping printing inks.

In addition, the conventional multicolor stencil printing apparatus requires the same number of plate cylinders and base papers as the number of desired colors, and thus requires the same number of plate-making devices, resulting in an increase in price.

The present invention was made in view of the problems of the conventional technology, and provides a plate cylinder capable of full-color printing by overlapping printing inks of multiple colors, and a multicolor stencil printing machine that is small, simple in structure, and inexpensive. The aim is to realize a device.

(d) Means for Solving the Problems The first main invention is to divide the inside of the housing into a plurality of ink storage chambers around the central axis of the housing, in which the interior of the housing is divided into a plurality of ink storage chambers parallel to the extending direction of the central axis. This plate cylinder is characterized in that a plurality of partition walls having surfaces extending in the direction are fixedly installed.

The second main invention consists of a plate cylinder having a shape similar to a cylinder and having a partition wall fixed therein that divides the circumference of the central axis into a plurality of ink storage chambers, and a single ink storage chamber of the plate cylinder. A rotating body having a rotating circumference substantially the same length as the length of an arc around the storage chamber, and provided with paper holding and transferring means for holding the downstream edge of the printing paper around the rotating body. The rotating body is a multicolor stencil printing device in which the rotating body is in rolling contact with the plate cylinder.

(E) Effect In the first major invention, since a plurality of partition walls are fixedly installed to divide the inside of the casing into a plurality of ink storage chambers around the central axis of the casing, the plate cylinder can be rotated once. This makes it possible to color code in a direction intersecting the paper feeding direction.

In addition, by bringing a sheet of printing paper into contact with the outer periphery of the ink storage chamber containing each color of ink during one rotation of the plate cylinder, it is possible to print in full color by overlapping multiple colors of ink. .

The second major invention allows multicolor printing using one plate cylinder.

(F) Embodiment The drawings all show embodiments of the present invention, and FIG. 1 is a vertical cross-sectional view of a multicolor stencil printing device equipped with a plate cylinder, and FIG. 2 is a second embodiment of the plate cylinder. FIG. 3 is a schematic cross-sectional view showing an example.

In FIG. 1, ``■'' is the main body of the apparatus, and a plate cylinder 2 is rotatably mounted on a support shaft 3 slightly to the left of the center thereof. The plate cylinder 2 has a cylindrical casing, and its length in the generatrix direction (parallel to the direction in which the axis of rotation extends) is substantially the same as that of a conventional plate cylinder, but the diameter is approximately 3 mm. It is set to double. The peripheral side wall is constituted by a metal punching screen and a silk screen wound and fixed around the outer periphery of the punching screen.

Inside the plate cylinder 2, there is a space extending in a direction parallel to the extending direction of the central axis and dividing it into a plurality of ink storage chambers 4A, 4B, 4C and an empty space 4D around the central axis. A plurality of partition walls 5A, 5B, and 5C15D having surfaces extending in the radial direction about the central axis are fixedly provided. Further, in the center of the plate cylinder 2, an ink container mounting recess 6 having a clover-shaped cross section extending in a direction parallel to the extending direction of the central axis is provided, and an orange ink container containing orange ink is provided. 7A, a green ink container 7B containing green ink, and a black ink container 7C containing black ink are inserted and mounted in the horizontal direction. 8 is an ink injection hole.

The contact portions of the partition walls 5A, 5B where the ink storage chambers 4A, 4B, 4C are adjacent to each other and the inner wall of the housing extend in the circumferential direction by a predetermined length L1 in the shape of an eave. Note that this is intended to form a non-printing area, and can also be carried out by providing a non-perforated portion on the punching screen.

A paper clamper 11 is provided on the outer wall 9 of the empty space 4D to clamp the downstream end edge of the stencil paper 10 after making the plate.
is attached so that it can swing.

Dimensions between the bottom portions 12A and 12B and the eave portion 12
The dimension between A and the outer wall 9 and the dimension between the eave-like part 12B and the outer wall 9 are both set to L2, and this dimension L2
A timing pulley 13 on the driven side is fixed to the end surface of the zero plate cylinder 2, which has substantially the same length as the printing area of the stencil paper 10.

A DC servo motor 14 for rotationally driving the plate cylinder 2 is provided at the lower left of the plate cylinder 2, and a rotation shaft 15 of the DC servo motor 14 is driven by a pair of spur gears 16 and 17. It is connected to the side timing boolean 18. A timing belt 1 is provided between the driven side timing pulley 13 and the driving side timing pulley 18.
9 is hung. Thus, the plate cylinder 2 is rotationally driven in a counterclockwise direction.

In order to accurately control the rotational speed of the plate cylinder 2, the DC servo motor 14 is equipped with an encoder (not shown).
is installed.

A roll-shaped stencil paper 10 mounted on a reel 2o is provided on the upper right side of the plate cylinder 2, and the stencil paper 10 is mounted on a reel 2o.
A thermal head 21 and a platen roller 22 which are pressed against the thermal head 21 are provided for plate making a calligraphy image. Further, on the downstream side of the thermal head 2
A cutter 23 is provided for cutting at α). Incidentally, the stencil paper 10 on which a calligraphy image is made by the thermal head 21 and cut by the cutter 23 is guided to the plate cylinder 2 side by a means not shown, and as described above, the stencil paper 10 is moved downstream by the paper clamper 11. The side edge portions are pinched.

Below the plate cylinder 2, a plate discharge roller is rotatably attached to the free end of the swing lever 24 and can take a first position in contact with the plate cylinder 2 and a second position away from the plate cylinder 2. 25 and
A zero-plate cylinder 2 is provided with an auxiliary roller 26 that is pressed against the plate-discharge roller 25 when the plate-discharge roller 25 assumes the second position and peels off the stencil paper 10 after printing from the plate cylinder 2.
The stencil paper 10 peeled off is discharged downward from a stencil discharge hole 27 formed in the bottom plate of the main body of the apparatus.

A document placement recess 28 is formed on the top surface of the apparatus main body 1 in which a document to be printed is placed, and document conveyance rollers 29, 30, 31, 32, 33 for conveying the document are on the left side thereof.
and the document transport roller 29.30.31.32.3
A color image sensor 34 is provided for reading a calligraphic image of a document being conveyed by the scanner 3, converting it into an electrical signal, and outputting the electrical signal. The color image sensor 34 separates the calligraphy image of the document into colors and outputs a calligraphy image signal corresponding to each color, and the calligraphy image signal is amplified and sent to the thermal head 21.
is input. Therefore, the thermal head 21 separates the colors and prints a book image corresponding to each color.

After the document image has been read, the document is discharged onto a document discharge tray 37 by document discharge rollers 35 and 36. A rotating shaft 38 extending in a direction parallel to the extending direction of the support shaft 3 of the plate cylinder 2 is provided on the right side of the plate cylinder 2, and a pair of rotating shafts as a rotating body are provided on the rotating shaft 38. The base end of the arm 39 is fixed, and the holding plate 4 of the paper clamper 40 as a clamping member for the printing paper 50 is attached between the free ends of the swing arm 39.
1 is fixed. The holding plate 41 extends in a direction parallel to the extending direction of the rotating shaft 38, and its length is equal to that of the plate cylinder 2.
The width is substantially the same as the length in the generatrix direction of LL, and the width is substantially the same as LL.

A timing pulley 42 on the driven side is fixed to one end of the rotating wheel 38. Further, below the rotating wheel 38, there is a DC servo motor 4 similar to the one that rotationally drives the plate cylinder 2.
A rotating shaft 44 of this DC servo motor 43 is connected to a timing pulley 47 on the driving side via a pair of spur gears 45 and 46. A timing belt is stretched between the timing boot IJ42 on the driven side and the timing pulley 47 on the driving side. Note that this DC servo motor 43 is also connected to the plate cylinder 2.
An encoder (not shown) for accurately controlling the rotational speed of the swing arm 39 as well as the DC servo motor 14 of the
is installed.

The rotating arm 39 is rotated clockwise together with the paper clamper 40.

A roller holding arm 4 is attached to the frame (not shown) of the main body of the device.
A guide roller 51 for printing paper 50 is rotatably attached to the lower end of the roller holding arm 49, and the center portion of an abbreviated pressure roller holding lever 52 is pivoted. It is pivoted for free movement. A pressure roller 53 is rotatably attached to the end of the pressure roller holding lever 52 on the plate cylinder 2 side, and a tension roller 53 is provided on the opposite side to press the pressure roller 53 against the plate cylinder 2 side. A spring 54 is attached to the roller holding arm 49.
It is strung between.

A regulating member 55 for regulating the swinging dimension of the pressure roller holding lever 52 is screwed onto the pressure roller holding lever 52.

Since the pressure roller 53 is rotatably mounted on the pressure roller holding lever 52, the pressure roller 53
While being pressed against the plate cylinder 2, it is rotationally driven by the plate cylinder 2.

Further, on the right side of the rotary ring 38, a paper guide cylinder 56 is fixedly arranged in a curved manner so as to surround the rotary shaft 38 in an arc shape from the upper part to the lower part.

When the rotary wheel 38 rotates, the paper clamper 40 turns around the outside of the paper guide cylinder 56 and the guide roller 51 together with the holding plate 41, and then the plate cylinder 2
and the pressure roller 53.

It is assumed that the pressure roller 53 is controlled to be separated from the plate cylinder 2 only for a moment when the paper clamper 40 and the like pass between the plate w42 and the pressure roller 53.

At the lower right side of the main body 1 of the apparatus, a paper feed table 57 is formed to protrude from which a large number of sheets of printing paper 50 are stacked before printing. The paper feed table 57 is configured to gradually rise upward as the number of sheets stacked on the paper feed table 57 decreases.

A paper feed roller 58 is provided above the paper feed tray 57 on the downstream side along the paper feed direction, and is pressed against the printing paper 50 at the top of the paper feed roller 58 . Then, on the downstream side (left side) of the paper feed roller 58, a sheet of printing paper 50 that has been fed by the paper feed roller 58 is held at the paper clamper 40 at the appropriate timing after being stopped. Board 41
A pair of registration rollers 59, 60 which are pressed against each other are provided for re-feeding between the two.

Above the registration rollers 59 and 60, guide claws 61 are mounted so as to be swingable in the vertical direction, for separating the paper clamper 40 from the holding plate 41 and for guiding the printing paper 50 after printing is completed. Further, a discharge drive roller 62 for the printing paper 50 is attached to the holding shaft of the guide claw 61, and a discharge driven roller 63 is rotatably pressed against the upper part of the discharge drive roller 62. A paper ejection roller 64 is provided downstream (on the right side) of the ejection drive roller 62 , and a belt 65 is stretched between the paper ejection roller 64 and the ejection drive roller 62 .

Therefore, the printing paper 50 that has been held between the paper clamper 40 and the holding plate 41 is guided by the guide claw 61, transported by the discharge drive roller 62, discharge driven roller 63, and paper discharge roller 64, and is discharged to the right. Ru. On the right side of the paper ejection roller 64, a paper ejection tray 66, on which printing paper 50 after printing is stacked and stored, is detachably attached to the apparatus main body 1. Note that the paper feed roller 58, guide claw 61, etc. are controlled to operate once every time the swing arm 39 rotates three times.

First, the calligraphy image of each color read by the color image sensor 34 is made into a stencil paper IO by the thermal head 21, and the stencil paper IO is made into a stencil paper IO.
It is wound around the plate cylinder 2.

At this time, the downstream end of the stencil paper 10 is held by the paper clamper 11.
The area of the stencil paper 10 on which the calligraphy image corresponding to the color orange has been made is wrapped around the outside of the ink storage chamber 4A in which orange ink is stored, and the area where the calligraphy image corresponding to the color green has been made on the plate is held. The area where the green ink is stored is wrapped around the outside of the ink storage chamber 4B where green ink is stored, and the area where the calligraphy image corresponding to black is made is wrapped around the outside of the ink storage chamber 4C where the black ink is stored. wrapped around.

When the entire apparatus starts operating in this state, one sheet of printing paper 50 fed by the paper feed roller 58
After being temporarily stopped by the registration rollers 59 and 60, the printing paper 50 is re-fed between the paper clamper 40 and the holding plate 41 at the appropriate timing, and the re-fed printing paper 50 is moved between the paper clamper 40 and the holding plate 41. It is held between the holding plate 41 and the holding plate 41 .

As the rotating arm 39 rotates clockwise, the printing paper 50 rotates clockwise outside the guide roller 51, pressure roller 53, and paper guide cylinder 56. At this time, the plate cylinder 2 also rotates counterclockwise, but the circumferential speeds of the paper clamper 40 and the holding plate 41 are controlled to be very slightly slower than the circumferential speed of the plate cylinder 2.

The reason why the circumferential speed of the paper clamper 40 and the holding plate 41 is made slightly lower than the circumferential speed of the plate cylinder 2 is because the printing paper 50 is pressed against the plate cylinder 2 by the driven pressure roller 53. , is pressed against the printing area of the plate cylinder 2. At this time, if the circumferential speed of the paper clamper 40 and the holding plate 41 is higher than the circumferential speed of the plate cylinder 2, the printing paper 50 is
A nipping section between the paper clamper 40 and the holding plate 41 located on the downstream side, and a plate cylinder 2 and pressure roller 5 located on the upstream side.
This is because tension is applied between the pressure contact portion and the pressure contact portion 3, which may cause printing misalignment.

If the calligraphy images corresponding to each color are not accurately positioned, color misregistration will occur in the finished printed matter. Therefore, the operating speed of the plate cylinder 2 and the rotating arm 39 is determined by the servo motor 14 with an encoder.
．． 43.

Note that in order to ensure accurate contact between the stencil paper 10 and the printing paper 50, the non-printing area (Ll) of the stencil paper 10 is connected to the holding plate 41.
The operating speed of the plate cylinder 2 and the swing arm 39 is appropriately corrected and controlled while the plate cylinder 2 and the swing arm 39 are facing each other.

In this way, when performing three-color printing, the plate cylinder 2 is
During rotation, the rotating arm 39 rotates three times, and a calligraphy image formed with three colors of ink is printed on the same printing paper 50.

The printing paper 50 that has been printed in all colors is guided by the guide base 61, transported by the discharge drive roller 62, discharge driven roller 63, and paper discharge roller 64, and stacked and stored on the paper discharge tray 66.

Incidentally, while the paper clamper 40 and the holding plate 41 pass between the pressure contact portion of the plate cylinder 2 and the pressure roller 53, the plunger roller 53 is controlled to be separated from the plate cylinder 2.

In this embodiment, the apparatus performs multicolor printing using three colors, so three ink storage chambers 4A, 4B, and 4C are prepared. However, when performing multicolor printing using four colors (full color), As shown in FIG. 2, there are, for example, an ink storage chamber 4Y containing yellow ink, an ink storage chamber 4M containing magenta ink, and an ink storage chamber 4S containing cyan ink. Then, by using a plate cylinder 2 provided with an ink storage chamber 4K containing black ink, the rotating arm 39 may be rotated four times while the plate cylinder 2 rotates once.

(g) Effects of the Invention In the first major invention, a plurality of ink storage chambers are provided around the central axis of the plate cylinder, so that by rotating the plate cylinder once, the ink storage chambers can be moved in the direction crossing the paper feeding direction. Colors can also be printed.

Furthermore, by simply rotating the plate cylinder once, it is possible to print in full color by superimposing multiple colors of ink.

Therefore, it is possible to perform full-color printing very easily with one plate cylinder.

Furthermore, in the second main invention, multicolor printing can be performed by using the one plate cylinder without using a plurality of plate cylinders, resulting in miniaturization, low cost, and high reliability of the apparatus. Orbitalization can be realized.

Furthermore, since calligraphy images corresponding to each color are formed on a single sheet of base paper, so-called color shift does not occur during printing, and it is possible to improve the printing quality.

[Brief explanation of drawings]

FIG. 1 is an internal configuration diagram of a plate cylinder of the present invention and a multicolor stencil printing apparatus equipped with the plate cylinder, and FIG. 2 is a schematic diagram of a second embodiment of the plate cylinder of the present invention. 1... Device main body, 2... Plate cylinder, 3... Support shaft, 4
A, 4B, 4C, 4Y, 4M, 4S, 4K... Ink storage chamber, 5A, 5B, 5C, 5D... Partition wall, 6...
Ink container mounting recess, 7A, 7B, 7C... ink container, IO... stencil paper, 11... paper clamper, 1
2A, 12B--Eave-shaped portion, 21--Thermal head, 34--Color image sensor, 39--Swivel arm (rotating body), 40--Paper clamper (paper holding member)
, 41... Holding plate, 50... Printing paper, 53...
Pressure roller, 58...Paper feed roller, 61...
guide group.

Claims (1)

[Scope of Claims] 1. In a plate cylinder having a casing having a shape similar to a cylinder, in which a member that allows penetration of printing ink is attached to at least the printing area on the circumferential side, the inside of the casing is defined by its central axis. 1. A plate cylinder, characterized in that a plurality of partition walls having a surface extending in a direction parallel to the extending direction of the central axis are fixedly installed for dividing the ink storage chamber into a plurality of ink storage chambers around the plate cylinder. 2. The plate cylinder according to claim 1, wherein a non-printing area is formed partially in the circumferential direction at the contact portion of the partition wall with the inner wall of the housing. 3. The plate cylinder according to claim 1 or 2, wherein the length of the printing area corresponding to each ink storage chamber in the circumferential direction is substantially the same as the length of the printing paper in the paper feeding direction. 4. A plate cylinder having a shape similar to a cylinder and having partitions fixed therein that divide the circumference of the central axis into a plurality of ink storage chambers, and a circular arc around the single ink storage chamber of the plate cylinder. and a rotating body having a rotational circumference substantially the same length as the length of the rotating body, the rotating body being provided with a paper holding and transferring means for holding the downstream edge of the printing paper around the periphery, the rotating body is a multicolor stencil printing device which is connected to the plate cylinder. 5. A plate cylinder having a shape similar to a cylinder and having partition walls fixed therein to divide the periphery of the central axis into a plurality of ink storage chambers, a rotational drive means for rotationally driving the plate cylinder, and the plate; A pressure roller is provided on the circumferential side of the cylinder so as to be able to come into contact with and separate from it and is in pressure contact with at least the printing area, and a pressure roller that holds the downstream edge of the printing paper and passes through the pressure contact portion between the plate cylinder and the pressure roller to remove the printing paper. A multicolor stencil printing apparatus comprising a paper holding and transporting means for bringing the paper into pressure contact with the printing area of the plate cylinder. 6. The multicolor stencil printing apparatus according to claim 5, wherein the paper holding and transferring means is constituted by a rotating arm and a paper holding member attached to the distal end of the rotating arm. 7. The length of the rotation locus of the paper holding member is substantially the same as the length in the circumferential direction of the printing area corresponding to each ink storage chamber of the plate cylinder. multicolor stencil printing equipment. 8. The multicolor stencil printing apparatus according to any one of claims 4 to 7, wherein a non-printing area is formed partially in the circumferential direction at the contact portion of the partition wall with the inner wall of the plate cylinder. 9. Multicolor stencil printing according to any one of claims 4 to 8, wherein the plate cylinder is divided into a plurality of ink storage chambers, and each ink storage chamber stores printing ink of a different color. Device. 10. The plate cylinder is divided into at least four ink storage chambers, and each ink storage chamber stores printing ink of each color corresponding to the three primary colors and black printing ink, respectively. 9. The multicolor stencil printing device according to any one of 9. 11. The multicolor stencil printing apparatus according to any one of claims 4 to 10, wherein each ink storage chamber is formed with an ink container mounting recess into which an ink container is mounted. 12. According to any one of claims 5 to 11, wherein the paper holding and transferring means is configured to pass the printing paper through the pressure contact portion between the plate cylinder and the pressure roller the same number of times as the number of ink storage chambers. The described multicolor stencil printing device. 13. The multicolor stencil printing apparatus according to any one of claims 4 to 12, wherein the plate cylinder and the paper holding and transporting means are each driven by separate servo motors. 14. A calligraphy image reading means for reading a calligraphy image of a manuscript, a plate-making means for making a stencil from the calligraphy image read by the calligraphy image reading means, and wrapping the stencil paper after the stencil making around the outer circumference of the printing cylinder. The multicolor stencil printing apparatus according to any one of claims 4 to 13, further comprising a base paper mounting means.