JP3294237B2 - Multicolor printing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor printing apparatus.

[0002]

2. Description of the Related Art In general, some printing apparatuses are capable of not only a single color but also a multi-color or a full-color printing.
No. 90489, JP-A-63-14069 or JP-A-2-245373.

[0003] According to the above publication, by winding a printing stencil sheet to a plurality of the plate cylinder, which was used, from the plate cylinder so as to face while conveying the printing paper by a flat belt for this each plate cylinder An image is transferred, or a stencil sheet for printing is wound around a plurality of plate cylinders, or a plurality of plate cylinders are used. Then, the colors are superimposed on the plate cylinder, and the superimposed color image is transferred to the printing paper.Furthermore, a single plate cylinder is provided by dividing a region containing a plurality of color inks. In addition, the respective areas are opposed to the printing paper to form a superimposed color image.

[0004]

In the above-mentioned example, for example, when the printing paper is attracted to the belt, a slippage occurs between the paper and the belt, and the image position and the color are different. The accuracy of the polymerization position may be deteriorated.

In the case where the plate cylinder is divided and a single stencil sheet for printing is wound around the peripheral surface of the plate cylinder, the color on the paper is obtained by one rotation of the plate cylinder, as described above. When the image transfer is performed and the position accuracy between the area containing the ink of each color and the image position on the printing paper and between the colors is poor,
The position cannot be adjusted. In addition, the diameter of the plate cylinder increases,
The device becomes larger.

When a plurality of plate cylinders are used, using expensive heating elements (such as a thermal head) for each plate making increases the cost of the apparatus.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional multicolor printing apparatus, it is an object of the present invention to easily perform consistency between image positions and color overlap positions, and
An object of the present invention is to provide a multicolor printing apparatus capable of automatically mounting a printing base paper corresponding to a plate and performing high-accuracy printing.

[0008]

In order to achieve this object, the present invention provides a method of superposing a plurality of color images using a heat-sensitive stencil sheet in which dot-like perforations are formed by heating elements arranged in a dot-like manner. A multi-color printing apparatus for forming a color image by using the heat-sensitive stencil sheet on the downstream side in the moving direction.
The heat-sensitive stencil paper is held on the peripheral surface
Equipped with an ink supply mechanism inside
Rotatable first and second plate cylinders;
It is located at the position facing each and transports the printing paper
Select a rotatable printing means and one of the plate cylinders described above.
A pressing mechanism for selectively contacting and separating the printing means, and a first plate
First top and bottom position adjustment for adjusting the top and bottom of the cylinder and the printing means
Mechanism for adjusting the top and bottom of the first and second plate cylinders
And a vertical position adjustment mechanism .

[0009] The present invention is characterized in that is provided with a detachable structure of the plate cylinder.

[0010]

According to the present invention, the top and bottom positions in the rotation direction of each cylinder are adjusted during printing to adjust the color and image values for color matching and image matching on the printing paper on the plate cylinder and printing cylinder. Can be secured.

According to the present invention, the type of color can be easily changed by changing the plate cylinder.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a layout diagram showing the overall configuration of a multicolor printing apparatus according to an embodiment of the present invention. In FIG. 1, the multicolor printing apparatus 1 includes a printing unit 2 and a scanning unit 3 therein. The scanning section 2 is provided with a document feeding mechanism and an optical system having a well-known structure, and an image reading section constituted by an image scanner. A printing paper 3 is provided with a base paper G wound around a spool 4.

The above-mentioned stencil sheet G is a heat-sensitive stencil sheet. When the stencil sheet G is fed out of the spool 4, the stencil sheet G is perforated by a heating element 5 such as a thermal head so that stencil making in accordance with the original image is performed. It has become.

The heating element 5 performs perforation according to a color image in a document image via a control unit in response to an output signal from an image reading unit located in the scanning unit 3.

The heat-sensitive stencil sheet G, which has completed plate making by the heating element 5, is cut to a required length by a cutter 6 arranged on the downstream side in the moving direction, and oscillating claws constituting a transport path switching means. 7, the transfer direction to the plate cylinder described later is set.

The swinging pawl 7 is supported so as to be swingable, and is capable of transporting a heat-sensitive stencil sheet G toward a first plate cylinder, which will be described later, and a heat-sensitive stencil sheet G toward a second plate cylinder. Can be switched via the solenoid 8 to a position in which it can be transferred.

The heat-sensitive stencil sheet G whose transfer direction has been switched is sent to one of the first and second plate cylinders to be described later by a feeding roller 9 located in the moving path.

In the case of the present embodiment, the above-described plate cylinder is denoted by reference numeral 1.
As shown by 0 and 11, two printers are provided so that multicolor printing can be performed.

Each of the plate cylinders 10 and 11 has the same structure, for example, for black ink in which the plate cylinder 10 is the first color, and for red ink in which the plate cylinder 11 is the second color. Specifically, the peripheral surface of the cylinder is formed of a metal punching screen, and the outer surface of the cylinder is wrapped with a silk screen so that ink oozes out of an ink supply mechanism built in. It is configured to be possible.

The ink supply mechanism 12 includes a coating roller 12A.
And a kneading roller 12B.
0 A, the ink discharged from the ink discharge port is provided on the 11 A B - coated with batter in a state of accumulated between La Russia - and is adapted to exude on the plate cylinder surface la 12A.

The above-described plate cylinder surface is provided with a clamp mechanism 13 having a clamp claw 13A capable of swinging in a part thereof in the circumferential direction so as to hold the leading end of the heat-sensitive stencil sheet G.

The plate cylinders 10, 11 have their rotating shafts 10A, 11
A is attached to the swinging end of a swingable arm (not shown) so that the arm also functions as a press roller for the printing cylinder when it swings to the printing cylinder side described later. Has become.

The printing cylinder 14 is supported by a rotating shaft 14A and is rotatable. The printing paper is wound around the peripheral surface to function as a transfer cylinder.
There is provided a clamp mechanism composed of a swinging claw 14B for holding the leading end of the swinging claw.

[0025] The printing cylinder 14, its attached to the rotation axis represents the driven flop - through a timing belt 16 which is applied between the Li - Li 14 A and the drive motor - drive-flop is provided on the output shaft of the motor 15 In the drawing, the printing paper S is rotated in a counterclockwise direction, and rotates while holding the leading end of the printing paper S fed from the paper feeding device 17 so that the image from the plate cylinder onto the printing paper S is rotated. It is designed to receive transcription.

Further, in the vicinity of the printing cylinder 14,
The sheet feeding device 17 includes a sheet feeding tray 17A that stores the printing paper S in a stacked state and the sheet feeding tray 17A.
Pickup rod that can be separated from and separated from the topmost item in A
17B and the fed printing paper S are applied to the printing cylinder 14
Feeding roller 1 which feeds in when it faces rocking claw 14B of
7C.

Behind the position facing the plate cylinder in the direction of rotation of the printing cylinder 14 described above, a peeling claw 18 is provided. Is provided with suction conveyance means 19 comprising a conveyance belt 19A and a motor fan 19B, and the printing paper S peeled off from the printing cylinder 14 is described above via the conveyance belt 19A by the suction action of the motor fan 19B. The paper is discharged to a paper discharge tray 19C located on the same side as the side on which the paper feeding device 17 is provided.

At the positions where the facing of the plate cylinders 10 and 11 with respect to the printing cylinder 14 in the rotation direction has been completed, base paper collecting devices 20 each having a pair of introduction rollers 20A at the entrance side are arranged.

The above-mentioned plate cylinders 10 and 11 have their rotation shafts supported by the side wall of the printing apparatus, and the side walls are provided so that the portion supporting the rotation shaft can be attached to and detached from other portions. At the time of replacement, the plate cylinder can be pulled out by removing the side wall.

The plate cylinders 10, 1 with respect to the printing cylinder 14 described above.
Numeral 1 can adjust the top and bottom positions which affect the image position and the color matching position with respect to the printing paper S wound on the printing cylinder 14.

As shown in FIG. 2, the top / bottom position adjusting mechanism 21 includes a plurality of gears including gears mounted on the rotating shafts of the plate cylinders 10, 11 and the printing cylinder 14, and a link mechanism.

The vertical position adjusting mechanism in the present embodiment includes adjusting gears 23 and 22 mounted on the second plate cylinder 11 and the printing cylinder 14 of the plate cylinders 10 and 11, and a shaft 14.
A, a sector gear 24 that can swing about 11A as a fulcrum,
The teeth of the sector gear 24 with each other only engage, for example Parusumo -
First and second drive motors 25 and 26,
And drive gears 27 and 28 attached to the output shaft. Reference numeral 10G indicates an adjustment gear integrated with the plate cylinder 10.

Link members 29 and 30 are pivotally connected at one ends thereof to the sector gear 24, and driven gears 31 and 3 meshing with the adjustment gears 22 and 23 are provided at one end thereof.
The idle gears 33 and 34 that mesh with the driven gears 31 and 32 are provided on the other end sides of the link members 29 and 30.

The other ends of swing levers 35, 36, which are pivotally connected at one end to the shaft 10A of the first plate cylinder 10, are pivotally connected to the rotation shafts of the idle gears 33, 34 described above.

In the vertical position adjusting mechanism having such a structure, a case where the vertical position of the printing cylinder 14 and the plate cylinder 10 are adjusted will be described. In this case, the first drive motor is used.
When motor 25 is set the rotation amount and rotation direction by the output signal from the rotation controller, not shown, to swing the sector gear 24 by its rotation, the driven gear 31 of the printing cylinder 14 side with the rocking of the sector gear 24 The peripheral surface of the drive gear 22 rolls, and the idle gear 33 tries to roll on the peripheral surface of the adjustment gear 10G on the plate cylinder 10 side via the link member 29 to which the driven gear 31 is attached.

When the adjusting gear 10G tries to roll, if the inertial mass of the adjusting gear 10G on the printing cylinder 14 is larger than the inertial mass of the adjusting gear 22 on the printing cylinder 14, the idle gear 33 Is the adjustment gear 10G on the plate cylinder 10 side
Will be pushed. Accordingly, the link member 29 pushes the driven gear 31 in response to the movement of the idle gear 33, whereby the driven gear 31 causes the adjustment gear 2 on the printing cylinder 14 side.
2 rotates, and the printing cylinder 14 rotates by an amount corresponding to the above-described rotation amount to change the vertical position with respect to the plate cylinder 10.

The vertical position adjustment between the plate cylinders is performed by controlling the rotation of a second drive motor 26 for swinging the sector 24 on the plate cylinder 11 side.

When the second drive motor 26 rotates with the amount and direction of rotation set, as in the case described above,
The sector 24 swings, and the driven gear 32 follows the swing.
There is rolled idle gear 34 on the circumferential surface of the plate cylinder 10 via the link member 30 rolls on the circumferential surface of the adjustment gear 2 3 of the plate cylinder 11 side.

[0039] In this case, when the inertia mass between the plate cylinder 10 and plate cylinder 11 and gear adjustment is provided to 10G, 2 3 are those of the plate cylinder 10 side large, the idle gear 34 is pressed, the link The driven gear 32 is pushed through the member 30 and the adjustment gear 23 on the plate cylinder 11 is rotated to change the vertical position between the plate cylinders. A mechanism other than this method may be used for the vertical position adjusting mechanism.

Since the present embodiment has the above structure,
Now, the case of performing multi-color printing using black and red inks using the plate cylinders 10 and 11 will be described as follows.

When the scanning section 3 reads an image for each color of the original, the stencil sheet G for printing is fed out from the spool 4 and perforated by the heating element 5 to make a plate. The plate making by the heating element 5 is performed for each color, and a stencil sheet G for printing is fed from the spool 4 for each plate making. It is the sum of the length of the plate making image,
When the length is extended, it is cut by the cutter 6.

The cut stencil sheet G for printing is guided in a direction corresponding to the setting of the position of the swinging pawl 7 by the solenoid 8 located behind the cutter 6 in the transfer path, and is guided to the plate cylinder 1.
0 and the plate cylinder 11.

The leading end of the stencil sheet G for printing guided to the plate cylinders 10 and 11 is clamped by a clamp claw 13A of the clamp mechanism 13.

After the stencil sheet G for printing has been wound around the plate cylinders 10 and 11, the printing paper S is fed from the paper feeding device 17 via the pickup roller 17B and the feeding roller 17C to the feeding tray 17A. And is conveyed toward the printing cylinder 14, and the leading end thereof is pinched by the swinging claws 14 </ b> B and wound around the printing cylinder 14.

In each of the plate cylinders 10 and 11, the plate cylinder located on the upstream side in the rotation direction of the printing cylinder 14 in accordance with the ink oozing out to the surface by the internal ink supply mechanism 12, The plate cylinder 11, which is leaching the red ink of the second color on the surface, is displaced toward the printing cylinder 14 and contacts the printing cylinder 14, and the color image via the printing stencil sheet S is formed on the printing paper S. Printed.

The printing paper S to which the color image has been transferred from the plate cylinder 11 faces the plate cylinder 10 which supplies the first color ink by rotating the printing cylinder 14. Therefore, the plate cylinder 10
The printing cylinder 14 moves as the printing paper S moves.
, And comes into contact with the printing cylinder 14 to receive the color image from the plate cylinder 10, and are separated by the separating claw 18, and are transported by the transport belt 19 A and the motor fan 19 of the suction transport device 19.
The paper is discharged toward the paper discharge tray 19C via B.

If the overlapping positions of the colors in the color images transferred by the plate cylinders 10 and 11 are shifted, the first and second drive motors 25 and By driving any one of 26, the vertical position between the plate cylinders or between the print cylinders is changed.

When it is desired to change the color of the above-described transferred image, the plate cylinder is taken out by removing a part of the side wall of the printing device supporting the plate cylinder, and the plate containing ink of another color is taken out. Insert the torso.

According to this embodiment, the paper feeding device and the paper ejection tray
Are located on the same side, the height of the printing apparatus in the width direction can be reduced.

Since image printing by the copying method is sufficient,
The multi-color printing of a large number of sheets can be reliably performed at a low cost, and processing from plate making of multi-color printing to image transfer can be automatically performed. What
Note that the first plate cylinder is 11 and the second plate cylinder is 10.
The first plate cylinder 11 and the printing cylinder 14 can be adjusted.
Top and bottom adjustment mechanism so that the plate cylinders can be adjusted
It is needless to say that it is also possible to configure

[0051]

As described above, according to the present invention, the first version
Adjusting the vertical position of the cylinder and printing cylinder, and the first and second plate cylinders
Color polymerization when using multiple plate cylinders
Position or image alignment can be easily set.
To prevent the occurrence of defective images.
Can be.

Further, according to the present invention, since the structure for attaching and detaching the plate cylinder is provided, it is possible to easily replace the plate cylinder and easily change the color.

[Brief description of the drawings]

FIG. 1 is a layout diagram showing an overall configuration of a multicolor printing apparatus according to the present invention.

FIG. 2 is a model diagram showing a vertical position adjusting mechanism in the printing apparatus shown in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Multicolor printing apparatus 2 Printing part 3 Scanning part 5 Heating element 6 Cutter 7 Oscillating claw 10 First color plate cylinder 10G adjustment gear 11 Second color plate cylinder 12 Ink supply mechanism 13 Clamp mechanism 14 Printing cylinder 15 Drive Motor 17 Paper feeder 19 Suction / conveyance device 20 Base paper recovery device 21 Top and bottom position adjustment mechanism 22, 23 Adjustment gear 24 Sector gear 25 First drive motor 26 Second drive motor 27, 28 Drive gear 29 , 30 link member 31, 32 driven gear 33, 34 idle gear 35, 36 swing lever

Claims (2)

(57) [Claims] 1. A multicolor printing apparatus for forming a color image by superimposing a plurality of color images using a heat-sensitive stencil sheet in which dot-shaped perforations are formed by heating elements arranged in a dot-like manner. Rotatable first and second rotatable stencil sheets are disposed on the downstream side in the moving direction of the stencil sheet, and have holding means for holding the heat-sensitive stencil sheet on the peripheral surface thereof and an ink supply mechanism therein. A plate cylinder, rotatable printing means arranged at a position facing each of the plate cylinders and capable of conveying printing paper, and a pressing mechanism for selectively bringing one of the plate cylinders into and out of contact with the printing means. A first top and bottom position adjustment mechanism for adjusting the top and bottom of the first plate cylinder and the printing means, and a second top and bottom position adjustment mechanism for adjusting the top and bottom of the first plate cylinder and the second plate cylinder. Multicolor printing device. 2. A multi-color printing apparatus according to claim 1, further comprising a plate cylinder attaching / detaching structure.