JP2513704B2 - Plate making and printing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stencil plate-making printing apparatus having a function of performing multicolor printing, and particularly to a plate-making printing apparatus suitable for two-color overprinting.

[Prior art]

Conventionally, it is almost impossible for a stencil printing press to use a full-color original such as a color photograph or a poster to print it in full-color.

Recently, a stencil printing machine capable of performing multicolor overcoating by easily changing drums has been put on the market, and multicolor printed matter by overprinting of 2 to 5 colors can be easily obtained. This isn't full color, but it looks good enough for flyers. Two-color printing is particularly easy to use and is often used.

Conventionally, when making a two-color overprint of a single original of two colors separately for each plate, first, the original is copied and cut or aligned and pasted together. Inevitably, two originals were prepared by preparing two originals to be used for plate making for each color and then making each original.

FIG. 3 is a diagram for explaining a procedure in the case of performing multicolor printing by single color overprinting by exchanging the drum unit.

First, a manuscript 71 consisting of two colors, red and blue, is copied using a copying machine or the like, and then two kinds of manuscripts, a manuscript 72 for printing red and a manuscript 73 for printing blue, They were created by cutting and pasting.

In the figure, the process A indicates a process of copying, cutting and positioning, positioning and pasting on different sheets.

By the way, such a work is very troublesome due to the alignment and the like, and it becomes almost impossible especially when the image becomes complicated.

Therefore, there is a problem that a general user cannot easily perform multicolor printing, and a document created by cutting and pasting has a problem that a shadow of a pasted end appears on a printed matter.

〔Purpose〕

The present invention eliminates the drawbacks of the conventional example described above, and if there is one original document of multicolor (especially two colors), it is not necessary to make another original document, and platemaking and printing for multicolor overprinting. An object of the present invention is to provide a plate-making printing device capable of

〔Constitution〕

For that purpose, the plate-making printing apparatus according to the present invention is provided with a color filter capable of color switching on the optical path of document reading, and switches the color filter corresponding to the color of the mounted drum unit and the color of the multicolor document, It is characterized by plate making and printing for each color.

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of a stencil-type plate-making / printing apparatus adopting the present invention.

Reference numeral 1 denotes a document reading unit. A document 12 placed on a document receiving table 11 facing downward is a pair of document conveying rollers 13 and 14.
Accurately transported by. The light from the fluorescent lamp 15 is reflected by the document surface, the optical path is changed by the mirror 16, and then the lens unit
The image information of the original is converged by 17 and photoelectrically converted by the CCD sensor 18 to be converted into an electric signal.

The plate-making writing unit 2 is a roll-shaped heat-sensitive stencil sheet 21.
A platen roller 22 for pressing it against the thermal head while transporting it, a thermal head 23 for perforating image information on the base paper 21, a base paper cutting cutter 24, and a feeding device for feeding the front end of the base paper 21 to the clamper part of the printing drum. Plate roller 25
It has and.

The plate discharge unit 3 includes a peeling roller 31 for peeling the end of the used base paper from the outer periphery of the printing drum, a conveying roller 32 for conveying the discharged base paper between the peeling roller 31, and a used base paper peeled from the print drum. And a plate discharge storage box 33 for storing.

Next, in the printing section, the printing paper 42 stacked on the paper feed table 41 is sent out from the uppermost one by the rotation of the calling roller 43, and the printing paper 42 is fed between the paper feeding roller 44 and the separation blade 45 by one.
Only the sheets are separated and sent to 46 parts of the feed roller.

The feed roller 46 sends the printing paper toward between the drum 47 and the press roller 48 in synchronization with the rotation of the printing drum 47.

A printing drum wrapped around a stencil original
47 has an ink supply unit inside thereof, and by sandwiching the printing paper between it and the press roller 48, the printing ink is transferred to the paper according to the openings of the base paper.

The printed sheets are conveyed by the sheet discharge and adsorption unit 49 and sequentially stacked on the sheet discharge tray 50.

The printing drum 47 is integrated as an ink supply container, an ink supply pump, and an ink supply unit as a drum unit so that it can be detached by sliding it in the axial direction, and the drum unit containing black ink and the red ink can be inserted. Multiple drum units can be exchanged and used one after another, such as the drum unit. Details of the drum unit attaching / detaching mechanism are described in detail in Japanese Utility Model Application No. 61-85462 by the same applicant.

The plate-making machine according to the present invention has a function for color separation, the outline of which will be described below.

In the document reading unit 1, a filter unit 35 is provided on the optical path in front of the lens unit 17 so that a plurality of color filters can be switched.

For example, the filter unit 35, as shown in FIG.
Four kinds of color filters of transparent (F1), red (F2), blue (F3), and yellow (F4) are arranged in a disk shape, and the rotation of the motor 36 can switch the filters.

Next, as a first example, a case where multicolor printing is performed by using one original made of two colors of red and blue will be specifically described.

 FIG. 4 shows the operation panel.

Set the red and blue originals on the original tray 11 and then select the red key 61 from the color specification keys on the operation panel 60.
Turn on the two keys, and the blue key 62. Then red LED65
And the blue LED 6 lights up.

Next, press the plate making start key 67. Then, at this time, if the machine has a red drum set, the machine detects it and the blue filter of the filter unit 35 is set so that the motor 36 of the filter unit is set.
To move.

When the red and blue colors are designated and the red drum is set, the machine controller determines whether to select the blue filter.

When the plate making start key 67 is pressed, the original 12 is conveyed,
The light from the fluorescent lamp 15 is reflected on the surface of the original and the optical path is changed by the mirror 16, but since it passes through the blue filter F3, the output of the blue part of the original image is red when it is input to the CCD image sensor 18. It is extremely lower than that of the part, and is below the threshold value for reading judgment.
As in 71, the blue image part is scanned in a missing form and at the same time the plate is made.

When plate making is completed in this way, the base paper is wrapped around the red printing drum by automatic plate feeding.

Next, enter the number of prints with the numeric keypad 68 and press the print start key 69. The paper 42 on the paper feed tray 41 is conveyed and printing is performed when passing between the print drum 47a and the press roller 48. A print in the form of ink 71 is formed.

 Next, the drum is replaced.

Remove the red print drum 47a and set the blue print drum 47b on the machine.

On the operation panel 60, the red LED 65 and the blue LED 66 remain lit.

Here, press the plate making start key 67. Then, the machine detects that the blue drum is set and operates the motor 36 of the filter unit 35 so that the red filter F2 of the filter unit 35 is selected.

The original 12 is conveyed and the light from the fluorescent lamp 15 is reflected on the surface of the original and the optical path is changed by the mirror 16.However, since it passes through the red filter F2, when it is input to the CCD image sensor 18, the red portion of the original image is The output is extremely lower than the blue part, and it is below the threshold value for reading judgment, so the red image part is read out as shown in 72 in Fig. 5 and the plate is made. To be done.

When plate making is completed, the base paper is wound around the outer circumference of the blue printing drum 47b by automatic plate feeding.

Set the paper for which red printing is completed on the paper tray 41, enter the number of prints with the numeric keypad 68, and press the print start key 69. Then, blue printing is performed and the printed matter printed in two colors, red and blue 73
Is completed.

FIG. 5 is a diagram for explaining the above-described process. As described above, the red and blue originals 70 are respectively applied to the filters,
The red and blue plate-making images 71 and 72 are made, and the red and blue printed matter 73 is obtained by performing overprinting twice.

As described above, according to the present invention, if there is only one original printed in two colors, the machine automatically performs color separation by switching the filters, so that it is possible to easily perform two-color printing by overprinting.
Color prints can be obtained.

Incidentally, FIG. 6 shows an embodiment of the color unit detection of the drum unit. 1 to 3 small magnets on the drum unit 47
51 can be attached, and the drum unit
Three Hall element sensors 52 are provided at positions facing the magnets of the machine body when 47 is set in the machine body.

The number and position of magnets differ depending on the color of the drum unit 47. For example, as shown in FIG. 6, only one is on the red drum, one is on the blue drum, and one is on the black drum. In the case, there is only one in the center, and so on, so that the control device of the machine body can judge the type of color drum set in the machine.

In addition, for example, there is a limit to say that the red part of the original is erased and read using the red filter F2,
Actually, the wavelength of the red filter F2 does not necessarily match the wavelength of the red reflected light of the actual document, so the reading threshold can be adjusted to ensure that the filter functions as little as possible. Is done.

Therefore, a volume switch for changing the reading threshold value is provided for each color on the sub operation panel.

It is also very effective to specify a color pen with a wavelength that is as close as possible to the wavelength that the filter has, and use that color pen to create the original so that color separation using the filter will be more reliable. is there.

Next, as a second specific example, a case where multicolor printing is performed using a single original sheet of two colors of red and black will be described.

Set the originals consisting of two colors, red and black, on the original tray 11, and then select the red key 61 from the color specification keys on the operation panel 60.
Turn on the two keys, black and black key 64. Then red LED65
And the black LED 68 lights up.

When one of the two colors of the original is black, color separation cannot be performed in the same manner as in the above first example. This is because it is impossible to extract other colors with a black filter.

First, attach the black drum unit to the machine body and press the plate making start key 67. Then, the filter unit 35 operates the filter unit motor 36 so that the red filter is set.

Then, the original 12 is conveyed, the light from the fluorescent lamp 15 is reflected on the original surface, and the optical path is changed by the mirror 16, but since it passes through the red filter F2, the red image of the original image is input to the CCD image sensor 18. The output of the part is extremely lower than that of the black part, and it is below the threshold value for reading judgment, so if the red image part is read as shown in 81 in FIG. At the same time, the plates are made. The base paper thus prepared is automatically supplied to the black printing drum 47C.

Then, when the number of prints is input with the ten key 68 and the print start key 69 is pressed, black printing is performed, and the same black printed matter as the plate-making image 81 is obtained.

Next, the black drum unit 47c is pulled out, and the red drum unit 47a is attached to the machine.

Then, the control device of the machine commands the transparent filter F1 of the filter unit 35 to be positioned on the optical path. In this case, the reading device of the machine will read the original as it is, as indicated by 82 in FIG.

On the other hand, the image 81 read through the red filter before that is stored once in the memory 93 of FIG.

FIG. 8 is a control block diagram of the reading unit. The image read using the transparent filter F1 is A / D converted 91, subjected to image signal processing 92, and then taken into the editing unit 94, where it is compared with the image stored in the memory 93. That is, the editing unit 94 edits the image of 83, that is, the red plate-making image while comparing the image of 81 and the image of 82.

In the image 82 read through the transparent filter 51, as a result of the comparison, if it overlaps with the output image 81 from the memory 93, it is deleted, and the image 83 of only red is extracted.

Then, the image of only red is plate-made, and the base paper is wound around the red drum 47a. Then, the paper on which the black printing has just been completed is set on the paper feed table 41 and the print start key 69 is pressed to perform the printing, whereby the red and black multicolor printed matter 84 is obtained.

In this case, it is necessary to pay attention to the document feeding accuracy. If there are skews or misregistrations in document feeding between the red filter F2 and the transparent filter F1, the image from the memory 93 and the image 82 when scanned by the transparent filter F1 do not overlap neatly and completely. I can not erase,
This is because an originally unnecessary image may be partially formed.

FIG. 7 is a diagram for explaining the process of the second embodiment described above.

Black and red plate making image 81,85 by the method and control as described above.
, And after performing overprinting twice, the red and black printed matter 84
Is what you get.

〔effect〕

The present invention is as described above, and according to the plate making / printing apparatus of the present invention, it is possible to easily perform multicolor printing without making originals for the number of colors.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a plate-making printing apparatus to which the present invention is applied, FIG. 2 is an external view of a filter unit, FIG. 3 is a diagram for explaining a multicolor printing process according to a conventional example, and FIG. FIG. 5 is a plan view of an operation panel according to the present invention, FIG. 5 is a view for explaining a multicolor printing process according to the first embodiment, FIG. 6 is a view showing an example of a color detecting mechanism of a drum unit, and FIG. FIG. 8 is a diagram for explaining the multicolor printing process according to the second embodiment, and FIG. 8 is a control block diagram of the same. 18 ... Image sensor, 23 ... Thermal head, 35 ... Color filter unit, 47 ... Drum unit.

Claims (1)

(57) [Claims] 1. A plate-making function of irradiating an original with light, reading the reflected light with an image sensor, and making a heat-sensitive plate by a thermal head, and a function of performing multicolor printing by single-color overprinting by exchanging a drum unit. In the stencil plate making and printing apparatus having the above, a color filter capable of color switching is provided on the optical path for reading the original, and the color filter is switched according to the color of the mounted drum unit and the color of the multicolor original, and the color filter A plate-making printing device characterized by plate-making and printing.